summaryrefslogtreecommitdiff
path: root/lisp/ox.el
blob: 41e1917452ec0f749c7809b933c3916b9bddb368 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
;;; ox.el --- Generic Export Engine for Org Mode

;; Copyright (C) 2012, 2013  Free Software Foundation, Inc.

;; Author: Nicolas Goaziou <n.goaziou at gmail dot com>
;; Keywords: outlines, hypermedia, calendar, wp

;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with this program.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:
;;
;; This library implements a generic export engine for Org, built on
;; its syntactical parser: Org Elements.
;;
;; Besides that parser, the generic exporter is made of three distinct
;; parts:
;;
;; - The communication channel consists in a property list, which is
;;   created and updated during the process.  Its use is to offer
;;   every piece of information, would it be about initial environment
;;   or contextual data, all in a single place.  The exhaustive list
;;   of properties is given in "The Communication Channel" section of
;;   this file.
;;
;; - The transcoder walks the parse tree, ignores or treat as plain
;;   text elements and objects according to export options, and
;;   eventually calls back-end specific functions to do the real
;;   transcoding, concatenating their return value along the way.
;;
;; - The filter system is activated at the very beginning and the very
;;   end of the export process, and each time an element or an object
;;   has been converted.  It is the entry point to fine-tune standard
;;   output from back-end transcoders.  See "The Filter System"
;;   section for more information.
;;
;; The core function is `org-export-as'.  It returns the transcoded
;; buffer as a string.
;;
;; An export back-end is defined with `org-export-define-backend',
;; which defines one mandatory information: his translation table.
;; Its value is an alist whose keys are elements and objects types and
;; values translator functions.  See function's docstring for more
;; information about translators.
;;
;; Optionally, `org-export-define-backend' can also support specific
;; buffer keywords, OPTION keyword's items and filters.  Also refer to
;; function documentation for more information.
;;
;; If the new back-end shares most properties with another one,
;; `org-export-define-derived-backend' can be used to simplify the
;; process.
;;
;; Any back-end can define its own variables.  Among them, those
;; customizable should belong to the `org-export-BACKEND' group.
;;
;; Tools for common tasks across back-ends are implemented in the
;; following part of then file.
;;
;; Then, a wrapper macro for asynchronous export,
;; `org-export-async-start', along with tools to display results. are
;; given in the penultimate part.
;;
;; Eventually, a dispatcher (`org-export-dispatch') for standard
;; back-ends is provided in the last one.

;;; Code:

(eval-when-compile (require 'cl))
(require 'org-element)
(require 'ob-exp)

(declare-function org-publish "ox-publish" (project &optional force async))
(declare-function org-publish-all "ox-publish" (&optional force async))
(declare-function
 org-publish-current-file "ox-publish" (&optional force async))
(declare-function org-publish-current-project "ox-publish"
		  (&optional force async))

(defvar org-publish-project-alist)
(defvar org-table-number-fraction)
(defvar org-table-number-regexp)



;;; Internal Variables
;;
;; Among internal variables, the most important is
;; `org-export-options-alist'.  This variable define the global export
;; options, shared between every exporter, and how they are acquired.

(defconst org-export-max-depth 19
  "Maximum nesting depth for headlines, counting from 0.")

(defconst org-export-options-alist
  '((:author "AUTHOR" nil user-full-name t)
    (:creator "CREATOR" nil org-export-creator-string)
    (:date "DATE" nil nil t)
    (:description "DESCRIPTION" nil nil newline)
    (:email "EMAIL" nil user-mail-address t)
    (:exclude-tags "EXCLUDE_TAGS" nil org-export-exclude-tags split)
    (:headline-levels nil "H" org-export-headline-levels)
    (:keywords "KEYWORDS" nil nil space)
    (:language "LANGUAGE" nil org-export-default-language t)
    (:preserve-breaks nil "\\n" org-export-preserve-breaks)
    (:section-numbers nil "num" org-export-with-section-numbers)
    (:select-tags "SELECT_TAGS" nil org-export-select-tags split)
    (:time-stamp-file nil "timestamp" org-export-time-stamp-file)
    (:title "TITLE" nil nil space)
    (:with-archived-trees nil "arch" org-export-with-archived-trees)
    (:with-author nil "author" org-export-with-author)
    (:with-clocks nil "c" org-export-with-clocks)
    (:with-creator nil "creator" org-export-with-creator)
    (:with-date nil "date" org-export-with-date)
    (:with-drawers nil "d" org-export-with-drawers)
    (:with-email nil "email" org-export-with-email)
    (:with-emphasize nil "*" org-export-with-emphasize)
    (:with-entities nil "e" org-export-with-entities)
    (:with-fixed-width nil ":" org-export-with-fixed-width)
    (:with-footnotes nil "f" org-export-with-footnotes)
    (:with-inlinetasks nil "inline" org-export-with-inlinetasks)
    (:with-latex nil "tex" org-export-with-latex)
    (:with-plannings nil "p" org-export-with-planning)
    (:with-priority nil "pri" org-export-with-priority)
    (:with-smart-quotes nil "'" org-export-with-smart-quotes)
    (:with-special-strings nil "-" org-export-with-special-strings)
    (:with-statistics-cookies nil "stat" org-export-with-statistics-cookies)
    (:with-sub-superscript nil "^" org-export-with-sub-superscripts)
    (:with-toc nil "toc" org-export-with-toc)
    (:with-tables nil "|" org-export-with-tables)
    (:with-tags nil "tags" org-export-with-tags)
    (:with-tasks nil "tasks" org-export-with-tasks)
    (:with-timestamps nil "<" org-export-with-timestamps)
    (:with-todo-keywords nil "todo" org-export-with-todo-keywords))
  "Alist between export properties and ways to set them.

The CAR of the alist is the property name, and the CDR is a list
like (KEYWORD OPTION DEFAULT BEHAVIOUR) where:

KEYWORD is a string representing a buffer keyword, or nil.  Each
  property defined this way can also be set, during subtree
  export, through an headline property named after the keyword
  with the \"EXPORT_\" prefix (i.e. DATE keyword and EXPORT_DATE
  property).
OPTION is a string that could be found in an #+OPTIONS: line.
DEFAULT is the default value for the property.
BEHAVIOUR determines how Org should handle multiple keywords for
  the same property.  It is a symbol among:
  nil       Keep old value and discard the new one.
  t         Replace old value with the new one.
  `space'   Concatenate the values, separating them with a space.
  `newline' Concatenate the values, separating them with
	    a newline.
  `split'   Split values at white spaces, and cons them to the
	    previous list.

Values set through KEYWORD and OPTION have precedence over
DEFAULT.

All these properties should be back-end agnostic.  Back-end
specific properties are set through `org-export-define-backend'.
Properties redefined there have precedence over these.")

(defconst org-export-special-keywords '("FILETAGS" "SETUPFILE" "OPTIONS")
  "List of in-buffer keywords that require special treatment.
These keywords are not directly associated to a property.  The
way they are handled must be hard-coded into
`org-export--get-inbuffer-options' function.")

(defconst org-export-filters-alist
  '((:filter-bold . org-export-filter-bold-functions)
    (:filter-babel-call . org-export-filter-babel-call-functions)
    (:filter-center-block . org-export-filter-center-block-functions)
    (:filter-clock . org-export-filter-clock-functions)
    (:filter-code . org-export-filter-code-functions)
    (:filter-comment . org-export-filter-comment-functions)
    (:filter-comment-block . org-export-filter-comment-block-functions)
    (:filter-diary-sexp . org-export-filter-diary-sexp-functions)
    (:filter-drawer . org-export-filter-drawer-functions)
    (:filter-dynamic-block . org-export-filter-dynamic-block-functions)
    (:filter-entity . org-export-filter-entity-functions)
    (:filter-example-block . org-export-filter-example-block-functions)
    (:filter-export-block . org-export-filter-export-block-functions)
    (:filter-export-snippet . org-export-filter-export-snippet-functions)
    (:filter-final-output . org-export-filter-final-output-functions)
    (:filter-fixed-width . org-export-filter-fixed-width-functions)
    (:filter-footnote-definition . org-export-filter-footnote-definition-functions)
    (:filter-footnote-reference . org-export-filter-footnote-reference-functions)
    (:filter-headline . org-export-filter-headline-functions)
    (:filter-horizontal-rule . org-export-filter-horizontal-rule-functions)
    (:filter-inline-babel-call . org-export-filter-inline-babel-call-functions)
    (:filter-inline-src-block . org-export-filter-inline-src-block-functions)
    (:filter-inlinetask . org-export-filter-inlinetask-functions)
    (:filter-italic . org-export-filter-italic-functions)
    (:filter-item . org-export-filter-item-functions)
    (:filter-keyword . org-export-filter-keyword-functions)
    (:filter-latex-environment . org-export-filter-latex-environment-functions)
    (:filter-latex-fragment . org-export-filter-latex-fragment-functions)
    (:filter-line-break . org-export-filter-line-break-functions)
    (:filter-link . org-export-filter-link-functions)
    (:filter-macro . org-export-filter-macro-functions)
    (:filter-node-property . org-export-filter-node-property-functions)
    (:filter-options . org-export-filter-options-functions)
    (:filter-paragraph . org-export-filter-paragraph-functions)
    (:filter-parse-tree . org-export-filter-parse-tree-functions)
    (:filter-plain-list . org-export-filter-plain-list-functions)
    (:filter-plain-text . org-export-filter-plain-text-functions)
    (:filter-planning . org-export-filter-planning-functions)
    (:filter-property-drawer . org-export-filter-property-drawer-functions)
    (:filter-quote-block . org-export-filter-quote-block-functions)
    (:filter-quote-section . org-export-filter-quote-section-functions)
    (:filter-radio-target . org-export-filter-radio-target-functions)
    (:filter-section . org-export-filter-section-functions)
    (:filter-special-block . org-export-filter-special-block-functions)
    (:filter-src-block . org-export-filter-src-block-functions)
    (:filter-statistics-cookie . org-export-filter-statistics-cookie-functions)
    (:filter-strike-through . org-export-filter-strike-through-functions)
    (:filter-subscript . org-export-filter-subscript-functions)
    (:filter-superscript . org-export-filter-superscript-functions)
    (:filter-table . org-export-filter-table-functions)
    (:filter-table-cell . org-export-filter-table-cell-functions)
    (:filter-table-row . org-export-filter-table-row-functions)
    (:filter-target . org-export-filter-target-functions)
    (:filter-timestamp . org-export-filter-timestamp-functions)
    (:filter-underline . org-export-filter-underline-functions)
    (:filter-verbatim . org-export-filter-verbatim-functions)
    (:filter-verse-block . org-export-filter-verse-block-functions))
  "Alist between filters properties and initial values.

The key of each association is a property name accessible through
the communication channel.  Its value is a configurable global
variable defining initial filters.

This list is meant to install user specified filters.  Back-end
developers may install their own filters using
`org-export-define-backend'.  Filters defined there will always
be prepended to the current list, so they always get applied
first.")

(defconst org-export-default-inline-image-rule
  `(("file" .
     ,(format "\\.%s\\'"
	      (regexp-opt
	       '("png" "jpeg" "jpg" "gif" "tiff" "tif" "xbm"
		 "xpm" "pbm" "pgm" "ppm") t))))
  "Default rule for link matching an inline image.
This rule applies to links with no description.  By default, it
will be considered as an inline image if it targets a local file
whose extension is either \"png\", \"jpeg\", \"jpg\", \"gif\",
\"tiff\", \"tif\", \"xbm\", \"xpm\", \"pbm\", \"pgm\" or \"ppm\".
See `org-export-inline-image-p' for more information about
rules.")

(defvar org-export-async-debug nil
  "Non-nil means asynchronous export process should leave data behind.

This data is found in the appropriate \"*Org Export Process*\"
buffer, and in files prefixed with \"org-export-process\" and
located in `temporary-file-directory'.

When non-nil, it will also set `debug-on-error' to a non-nil
value in the external process.")

(defvar org-export-stack-contents nil
  "Record asynchronously generated export results and processes.
This is an alist: its CAR is the source of the
result (destination file or buffer for a finished process,
original buffer for a running one) and its CDR is a list
containing the back-end used, as a symbol, and either a process
or the time at which it finished.  It is used to build the menu
from `org-export-stack'.")

(defvar org-export-registered-backends nil
  "List of backends currently available in the exporter.

A backend is stored as a list where CAR is its name, as a symbol,
and CDR is a plist with the following properties:
`:filters-alist', `:menu-entry', `:options-alist' and
`:translate-alist'.

This variable is set with `org-export-define-backend' and
`org-export-define-derived-backend' functions.")

(defvar org-export-dispatch-last-action nil
  "Last command called from the dispatcher.
The value should be a list.  Its CAR is the action, as a symbol,
and its CDR is a list of export options.")



;;; User-configurable Variables
;;
;; Configuration for the masses.
;;
;; They should never be accessed directly, as their value is to be
;; stored in a property list (cf. `org-export-options-alist').
;; Back-ends will read their value from there instead.

(defgroup org-export nil
  "Options for exporting Org mode files."
  :tag "Org Export"
  :group 'org)

(defgroup org-export-general nil
  "General options for export engine."
  :tag "Org Export General"
  :group 'org-export)

(defcustom org-export-with-archived-trees 'headline
  "Whether sub-trees with the ARCHIVE tag should be exported.

This can have three different values:
nil         Do not export, pretend this tree is not present.
t           Do export the entire tree.
`headline'  Only export the headline, but skip the tree below it.

This option can also be set with the #+OPTIONS line,
e.g. \"arch:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "Not at all" nil)
	  (const :tag "Headline only" 'headline)
	  (const :tag "Entirely" t)))

(defcustom org-export-with-author t
  "Non-nil means insert author name into the exported file.
This option can also be set with the #+OPTIONS line,
e.g. \"author:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-clocks nil
  "Non-nil means export CLOCK keywords.
This option can also be set with the #+OPTIONS line,
e.g. \"c:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-creator 'comment
  "Non-nil means the postamble should contain a creator sentence.

The sentence can be set in `org-export-creator-string' and
defaults to \"Generated by Org mode XX in Emacs XXX.\".

If the value is `comment' insert it as a comment."
  :group 'org-export-general
  :type '(choice
	  (const :tag "No creator sentence" nil)
	  (const :tag "Sentence as a comment" 'comment)
	  (const :tag "Insert the sentence" t)))

(defcustom org-export-with-date t
  "Non-nil means insert date in the exported document.
This options can also be set with the OPTIONS keyword,
e.g. \"date:nil\".")

(defcustom org-export-creator-string
  (format "Generated by Org mode %s in Emacs %s."
	  (if (fboundp 'org-version) (org-version) "(Unknown)")
	  emacs-version)
  "String to insert at the end of the generated document."
  :group 'org-export-general
  :type '(string :tag "Creator string"))

(defcustom org-export-with-drawers '(not "LOGBOOK")
  "Non-nil means export contents of standard drawers.

When t, all drawers are exported.  This may also be a list of
drawer names to export.  If that list starts with `not', only
drawers with such names will be ignored.

This variable doesn't apply to properties drawers.

This option can also be set with the #+OPTIONS line,
e.g. \"d:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "All drawers" t)
	  (const :tag "None" nil)
	  (repeat :tag "Selected drawers"
		  (string :tag "Drawer name"))
	  (list :tag "Ignored drawers"
		(const :format "" not)
		(repeat :tag "Specify names of drawers to ignore during export"
			:inline t
			(string :tag "Drawer name")))))

(defcustom org-export-with-email nil
  "Non-nil means insert author email into the exported file.
This option can also be set with the #+OPTIONS line,
e.g. \"email:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-emphasize t
  "Non-nil means interpret *word*, /word/, _word_ and +word+.

If the export target supports emphasizing text, the word will be
typeset in bold, italic, with an underline or strike-through,
respectively.

This option can also be set with the #+OPTIONS line, e.g. \"*:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-exclude-tags '("noexport")
  "Tags that exclude a tree from export.

All trees carrying any of these tags will be excluded from
export.  This is without condition, so even subtrees inside that
carry one of the `org-export-select-tags' will be removed.

This option can also be set with the #+EXCLUDE_TAGS: keyword."
  :group 'org-export-general
  :type '(repeat (string :tag "Tag")))

(defcustom org-export-with-fixed-width t
  "Non-nil means lines starting with \":\" will be in fixed width font.

This can be used to have pre-formatted text, fragments of code
etc.  For example:
  : ;; Some Lisp examples
  : (while (defc cnt)
  :   (ding))
will be looking just like this in also HTML.  See also the QUOTE
keyword.  Not all export backends support this.

This option can also be set with the #+OPTIONS line, e.g. \"::nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-footnotes t
  "Non-nil means Org footnotes should be exported.
This option can also be set with the #+OPTIONS line,
e.g. \"f:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-latex t
  "Non-nil means process LaTeX environments and fragments.

This option can also be set with the +OPTIONS line,
e.g. \"tex:verbatim\".  Allowed values are:

nil         Ignore math snippets.
`verbatim'  Keep everything in verbatim.
t           Allow export of math snippets."
  :group 'org-export-general
  :type '(choice
	  (const :tag "Do not process math in any way" nil)
	  (const :tag "Interpret math snippets" t)
	  (const :tag "Leave math verbatim" verbatim)))

(defcustom org-export-headline-levels 3
  "The last level which is still exported as a headline.

Inferior levels will produce itemize or enumerate lists when
exported.

This option can also be set with the #+OPTIONS line, e.g. \"H:2\"."
  :group 'org-export-general
  :type 'integer)

(defcustom org-export-default-language "en"
  "The default language for export and clocktable translations, as a string.
This may have an association in
`org-clock-clocktable-language-setup'."
  :group 'org-export-general
  :type '(string :tag "Language"))

(defcustom org-export-preserve-breaks nil
  "Non-nil means preserve all line breaks when exporting.
This option can also be set with the #+OPTIONS line,
e.g. \"\\n:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-entities t
  "Non-nil means interpret entities when exporting.

For example, HTML export converts \\alpha to &alpha; and \\AA to
&Aring;.

For a list of supported names, see the constant `org-entities'
and the user option `org-entities-user'.

This option can also be set with the #+OPTIONS line,
e.g. \"e:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-inlinetasks t
  "Non-nil means inlinetasks should be exported.
This option can also be set with the #+OPTIONS line,
e.g. \"inline:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-planning nil
  "Non-nil means include planning info in export.
This option can also be set with the #+OPTIONS: line,
e.g. \"p:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-priority nil
  "Non-nil means include priority cookies in export.
This option can also be set with the #+OPTIONS line,
e.g. \"pri:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-section-numbers t
  "Non-nil means add section numbers to headlines when exporting.

When set to an integer n, numbering will only happen for
headlines whose relative level is higher or equal to n.

This option can also be set with the #+OPTIONS line,
e.g. \"num:t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-select-tags '("export")
  "Tags that select a tree for export.

If any such tag is found in a buffer, all trees that do not carry
one of these tags will be ignored during export.  Inside trees
that are selected like this, you can still deselect a subtree by
tagging it with one of the `org-export-exclude-tags'.

This option can also be set with the #+SELECT_TAGS: keyword."
  :group 'org-export-general
  :type '(repeat (string :tag "Tag")))

(defcustom org-export-with-smart-quotes nil
  "Non-nil means activate smart quotes during export.
This option can also be set with the #+OPTIONS: line,
e.g. \"':t\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-special-strings t
  "Non-nil means interpret \"\\-\", \"--\" and \"---\" for export.

When this option is turned on, these strings will be exported as:

   Org     HTML     LaTeX    UTF-8
  -----+----------+--------+-------
   \\-    &shy;      \\-
   --    &ndash;    --         –
   ---   &mdash;    ---        —
   ...   &hellip;   \\ldots     …

This option can also be set with the #+OPTIONS line,
e.g. \"-:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-statistics-cookies t
  "Non-nil means include statistics cookies in export.
This option can also be set with the #+OPTIONS: line,
e.g. \"stat:nil\""
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-sub-superscripts t
  "Non-nil means interpret \"_\" and \"^\" for export.

When this option is turned on, you can use TeX-like syntax for
sub- and superscripts.  Several characters after \"_\" or \"^\"
will be considered as a single item - so grouping with {} is
normally not needed.  For example, the following things will be
parsed as single sub- or superscripts.

 10^24   or   10^tau     several digits will be considered 1 item.
 10^-12  or   10^-tau    a leading sign with digits or a word
 x^2-y^3                 will be read as x^2 - y^3, because items are
			 terminated by almost any nonword/nondigit char.
 x_{i^2} or   x^(2-i)    braces or parenthesis do grouping.

Still, ambiguity is possible - so when in doubt use {} to enclose
the sub/superscript.  If you set this variable to the symbol
`{}', the braces are *required* in order to trigger
interpretations as sub/superscript.  This can be helpful in
documents that need \"_\" frequently in plain text.

This option can also be set with the #+OPTIONS line,
e.g. \"^:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "Interpret them" t)
	  (const :tag "Curly brackets only" {})
	  (const :tag "Do not interpret them" nil)))

(defcustom org-export-with-toc t
  "Non-nil means create a table of contents in exported files.

The TOC contains headlines with levels up
to`org-export-headline-levels'.  When an integer, include levels
up to N in the toc, this may then be different from
`org-export-headline-levels', but it will not be allowed to be
larger than the number of headline levels.  When nil, no table of
contents is made.

This option can also be set with the #+OPTIONS line,
e.g. \"toc:nil\" or \"toc:3\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "No Table of Contents" nil)
	  (const :tag "Full Table of Contents" t)
	  (integer :tag "TOC to level")))

(defcustom org-export-with-tables t
  "If non-nil, lines starting with \"|\" define a table.
For example:

  | Name        | Address  | Birthday  |
  |-------------+----------+-----------|
  | Arthur Dent | England  | 29.2.2100 |

This option can also be set with the #+OPTIONS line, e.g. \"|:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-tags t
  "If nil, do not export tags, just remove them from headlines.

If this is the symbol `not-in-toc', tags will be removed from
table of contents entries, but still be shown in the headlines of
the document.

This option can also be set with the #+OPTIONS line,
e.g. \"tags:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "Off" nil)
	  (const :tag "Not in TOC" not-in-toc)
	  (const :tag "On" t)))

(defcustom org-export-with-tasks t
  "Non-nil means include TODO items for export.

This may have the following values:
t                    include tasks independent of state.
`todo'               include only tasks that are not yet done.
`done'               include only tasks that are already done.
nil                  ignore all tasks.
list of keywords     include tasks with these keywords.

This option can also be set with the #+OPTIONS line,
e.g. \"tasks:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "All tasks" t)
	  (const :tag "No tasks" nil)
	  (const :tag "Not-done tasks" todo)
	  (const :tag "Only done tasks" done)
	  (repeat :tag "Specific TODO keywords"
		  (string :tag "Keyword"))))

(defcustom org-export-time-stamp-file t
  "Non-nil means insert a time stamp into the exported file.
The time stamp shows when the file was created.

This option can also be set with the #+OPTIONS line,
e.g. \"timestamp:nil\"."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-with-timestamps t
  "Non nil means allow timestamps in export.

It can be set to `active', `inactive', t or nil, in order to
export, respectively, only active timestamps, only inactive ones,
all of them or none.

This option can also be set with the #+OPTIONS line, e.g.
\"<:nil\"."
  :group 'org-export-general
  :type '(choice
	  (const :tag "All timestamps" t)
	  (const :tag "Only active timestamps" active)
	  (const :tag "Only inactive timestamps" inactive)
	  (const :tag "No timestamp" nil)))

(defcustom org-export-with-todo-keywords t
  "Non-nil means include TODO keywords in export.
When nil, remove all these keywords from the export."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-allow-bind-keywords nil
  "Non-nil means BIND keywords can define local variable values.
This is a potential security risk, which is why the default value
is nil.  You can also allow them through local buffer variables."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-snippet-translation-alist nil
  "Alist between export snippets back-ends and exporter back-ends.

This variable allows to provide shortcuts for export snippets.

For example, with a value of '\(\(\"h\" . \"html\"\)\), the
HTML back-end will recognize the contents of \"@@h:<b>@@\" as
HTML code while every other back-end will ignore it."
  :group 'org-export-general
  :type '(repeat
	  (cons (string :tag "Shortcut")
		(string :tag "Back-end"))))

(defcustom org-export-coding-system nil
  "Coding system for the exported file."
  :group 'org-export-general
  :type 'coding-system)

(defcustom org-export-copy-to-kill-ring t
  "Non-nil means exported stuff will also be pushed onto the kill ring."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-initial-scope 'buffer
  "The initial scope when exporting with `org-export-dispatch'.
This variable can be either set to `buffer' or `subtree'."
  :group 'org-export-general
  :type '(choice
	  (const :tag "Export current buffer" 'buffer)
	  (const :tag "Export current subtree" 'subtree)))

(defcustom org-export-show-temporary-export-buffer t
  "Non-nil means show buffer after exporting to temp buffer.
When Org exports to a file, the buffer visiting that file is ever
shown, but remains buried.  However, when exporting to
a temporary buffer, that buffer is popped up in a second window.
When this variable is nil, the buffer remains buried also in
these cases."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-in-background nil
  "Non-nil means export and publishing commands will run in background.
Results from an asynchronous export are never displayed
automatically.  But you can retrieve them with \\[org-export-stack]."
  :group 'org-export-general
  :type 'boolean)

(defcustom org-export-async-init-file user-init-file
  "File used to initialize external export process.
Value must be an absolute file name.  It defaults to user's
initialization file.  Though, a specific configuration makes the
process faster and the export more portable."
  :group 'org-export-general
  :type '(file :must-match t))

(defcustom org-export-invisible-backends nil
  "List of back-ends that shouldn't appear in the dispatcher.

Any back-end belonging to this list or derived from a back-end
belonging to it will not appear in the dispatcher menu.

Indeed, Org may require some export back-ends without notice.  If
these modules are never to be used interactively, adding them
here will avoid cluttering the dispatcher menu."
  :group 'org-export-general
  :type '(repeat (symbol :tag "Back-End")))

(defcustom org-export-dispatch-use-expert-ui nil
  "Non-nil means using a non-intrusive `org-export-dispatch'.
In that case, no help buffer is displayed.  Though, an indicator
for current export scope is added to the prompt (\"b\" when
output is restricted to body only, \"s\" when it is restricted to
the current subtree, \"v\" when only visible elements are
considered for export, \"f\" when publishing functions should be
passed the FORCE argument and \"a\" when the export should be
asynchronous).  Also, \[?] allows to switch back to standard
mode."
  :group 'org-export-general
  :type 'boolean)



;;; Defining Back-ends
;;
;; `org-export-define-backend' is the standard way to define an export
;; back-end.  It allows to specify translators, filters, buffer
;; options and a menu entry.  If the new back-end shares translators
;; with another back-end, `org-export-define-derived-backend' may be
;; used instead.
;;
;; Internally, a back-end is stored as a list, of which CAR is the
;; name of the back-end, as a symbol, and CDR a plist.  Accessors to
;; properties of a given back-end are: `org-export-backend-filters',
;; `org-export-backend-menu', `org-export-backend-options' and
;; `org-export-backend-translate-table'.
;;
;; Eventually `org-export-barf-if-invalid-backend' returns an error
;; when a given back-end hasn't been registered yet.

(defmacro org-export-define-backend (backend translators &rest body)
  "Define a new back-end BACKEND.

TRANSLATORS is an alist between object or element types and
functions handling them.

These functions should return a string without any trailing
space, or nil.  They must accept three arguments: the object or
element itself, its contents or nil when it isn't recursive and
the property list used as a communication channel.

Contents, when not nil, are stripped from any global indentation
\(although the relative one is preserved).  They also always end
with a single newline character.

If, for a given type, no function is found, that element or
object type will simply be ignored, along with any blank line or
white space at its end.  The same will happen if the function
returns the nil value.  If that function returns the empty
string, the type will be ignored, but the blank lines or white
spaces will be kept.

In addition to element and object types, one function can be
associated to the `template' symbol and another one to the
`plain-text' symbol.

The former returns the final transcoded string, and can be used
to add a preamble and a postamble to document's body.  It must
accept two arguments: the transcoded string and the property list
containing export options.

The latter, when defined, is to be called on every text not
recognized as an element or an object.  It must accept two
arguments: the text string and the information channel.  It is an
appropriate place to protect special chars relative to the
back-end.

BODY can start with pre-defined keyword arguments.  The following
keywords are understood:

  :export-block

    String, or list of strings, representing block names that
    will not be parsed.  This is used to specify blocks that will
    contain raw code specific to the back-end.  These blocks
    still have to be handled by the relative `export-block' type
    translator.

  :filters-alist

    Alist between filters and function, or list of functions,
    specific to the back-end.  See `org-export-filters-alist' for
    a list of all allowed filters.  Filters defined here
    shouldn't make a back-end test, as it may prevent back-ends
    derived from this one to behave properly.

  :menu-entry

    Menu entry for the export dispatcher.  It should be a list
    like:

      \(KEY DESCRIPTION-OR-ORDINAL ACTION-OR-MENU)

    where :

      KEY is a free character selecting the back-end.

      DESCRIPTION-OR-ORDINAL is either a string or a number.

      If it is a string, is will be used to name the back-end in
      its menu entry.  If it is a number, the following menu will
      be displayed as a sub-menu of the back-end with the same
      KEY.  Also, the number will be used to determine in which
      order such sub-menus will appear (lowest first).

      ACTION-OR-MENU is either a function or an alist.

      If it is an action, it will be called with four
      arguments (booleans): ASYNC, SUBTREEP, VISIBLE-ONLY and
      BODY-ONLY.  See `org-export-as' for further explanations on
      some of them.

      If it is an alist, associations should follow the
      pattern:

        \(KEY DESCRIPTION ACTION)

      where KEY, DESCRIPTION and ACTION are described above.

    Valid values include:

      \(?m \"My Special Back-end\" my-special-export-function)

      or

      \(?l \"Export to LaTeX\"
           \(?p \"As PDF file\" org-latex-export-to-pdf)
           \(?o \"As PDF file and open\"
               \(lambda (a s v b)
                 \(if a (org-latex-export-to-pdf t s v b)
                   \(org-open-file
                    \(org-latex-export-to-pdf nil s v b)))))))

      or the following, which will be added to the previous
      sub-menu,

      \(?l 1
          \((?B \"As TEX buffer (Beamer)\" org-beamer-export-as-latex)
           \(?P \"As PDF file (Beamer)\" org-beamer-export-to-pdf)))

  :options-alist

    Alist between back-end specific properties introduced in
    communication channel and how their value are acquired.  See
    `org-export-options-alist' for more information about
    structure of the values."
  (declare (debug (&define name sexp [&rest [keywordp sexp]] defbody))
	   (indent 1))
  (let (export-block filters menu-entry options contents)
    (while (keywordp (car body))
      (case (pop body)
        (:export-block (let ((names (pop body)))
			 (setq export-block
			       (if (consp names) (mapcar 'upcase names)
				 (list (upcase names))))))
	(:filters-alist (setq filters (pop body)))
	(:menu-entry (setq menu-entry (pop body)))
        (:options-alist (setq options (pop body)))
        (t (pop body))))
    (setq contents (append (list :translate-alist translators)
			   (and filters (list :filters-alist filters))
			   (and options (list :options-alist options))
			   (and menu-entry (list :menu-entry menu-entry))))
    `(progn
       ;; Register back-end.
       (let ((registeredp (assq ',backend org-export-registered-backends)))
	 (if registeredp (setcdr registeredp ',contents)
	   (push (cons ',backend ',contents) org-export-registered-backends)))
       ;; Tell parser to not parse EXPORT-BLOCK blocks.
       ,(when export-block
	  `(mapc
	    (lambda (name)
	      (add-to-list 'org-element-block-name-alist
			   `(,name . org-element-export-block-parser)))
	    ',export-block))
       ;; Splice in the body, if any.
       ,@body)))

(defmacro org-export-define-derived-backend (child parent &rest body)
  "Create a new back-end as a variant of an existing one.

CHILD is the name of the derived back-end.  PARENT is the name of
the parent back-end.

BODY can start with pre-defined keyword arguments.  The following
keywords are understood:

  :export-block

    String, or list of strings, representing block names that
    will not be parsed.  This is used to specify blocks that will
    contain raw code specific to the back-end.  These blocks
    still have to be handled by the relative `export-block' type
    translator.

  :filters-alist

    Alist of filters that will overwrite or complete filters
    defined in PARENT back-end.  See `org-export-filters-alist'
    for a list of allowed filters.

  :menu-entry

    Menu entry for the export dispatcher.  See
    `org-export-define-backend' for more information about the
    expected value.

  :options-alist

    Alist of back-end specific properties that will overwrite or
    complete those defined in PARENT back-end.  Refer to
    `org-export-options-alist' for more information about
    structure of the values.

  :translate-alist

    Alist of element and object types and transcoders that will
    overwrite or complete transcode table from PARENT back-end.
    Refer to `org-export-define-backend' for detailed information
    about transcoders.

As an example, here is how one could define \"my-latex\" back-end
as a variant of `latex' back-end with a custom template function:

  \(org-export-define-derived-backend my-latex latex
     :translate-alist ((template . my-latex-template-fun)))

The back-end could then be called with, for example:

  \(org-export-to-buffer 'my-latex \"*Test my-latex*\")"
  (declare (debug (&define name sexp [&rest [keywordp sexp]] def-body))
	   (indent 2))
  (let (export-block filters menu-entry options translators contents)
    (while (keywordp (car body))
      (case (pop body)
	(:export-block (let ((names (pop body)))
			 (setq export-block
			       (if (consp names) (mapcar 'upcase names)
				 (list (upcase names))))))
        (:filters-alist (setq filters (pop body)))
	(:menu-entry (setq menu-entry (pop body)))
        (:options-alist (setq options (pop body)))
        (:translate-alist (setq translators (pop body)))
        (t (pop body))))
    (setq contents (append
		    (list :parent parent)
		    (let ((p-table (org-export-backend-translate-table parent)))
		      (list :translate-alist (append translators p-table)))
		    (let ((p-filters (org-export-backend-filters parent)))
		      (list :filters-alist (append filters p-filters)))
		    (let ((p-options (org-export-backend-options parent)))
		      (list :options-alist (append options p-options)))
		    (and menu-entry (list :menu-entry menu-entry))))
    `(progn
       (org-export-barf-if-invalid-backend ',parent)
       ;; Register back-end.
       (let ((registeredp (assq ',child org-export-registered-backends)))
	 (if registeredp (setcdr registeredp ',contents)
	   (push (cons ',child ',contents) org-export-registered-backends)))
       ;; Tell parser to not parse EXPORT-BLOCK blocks.
       ,(when export-block
	  `(mapc
	    (lambda (name)
	      (add-to-list 'org-element-block-name-alist
			   `(,name . org-element-export-block-parser)))
	    ',export-block))
       ;; Splice in the body, if any.
       ,@body)))

(defun org-export-backend-parent (backend)
  "Return back-end from which BACKEND is derived, or nil."
  (plist-get (cdr (assq backend org-export-registered-backends)) :parent))

(defun org-export-backend-filters (backend)
  "Return filters for BACKEND."
  (plist-get (cdr (assq backend org-export-registered-backends))
	     :filters-alist))

(defun org-export-backend-menu (backend)
  "Return menu entry for BACKEND."
  (plist-get (cdr (assq backend org-export-registered-backends))
	     :menu-entry))

(defun org-export-backend-options (backend)
  "Return export options for BACKEND."
  (plist-get (cdr (assq backend org-export-registered-backends))
	     :options-alist))

(defun org-export-backend-translate-table (backend)
  "Return translate table for BACKEND."
  (plist-get (cdr (assq backend org-export-registered-backends))
	     :translate-alist))

(defun org-export-barf-if-invalid-backend (backend)
  "Signal an error if BACKEND isn't defined."
  (unless (org-export-backend-translate-table backend)
    (error "Unknown \"%s\" back-end: Aborting export" backend)))

(defun org-export-derived-backend-p (backend &rest backends)
  "Non-nil if BACKEND is derived from one of BACKENDS."
  (let ((parent backend))
    (while (and (not (memq parent backends))
		(setq parent (org-export-backend-parent parent))))
    parent))



;;; The Communication Channel
;;
;; During export process, every function has access to a number of
;; properties.  They are of two types:
;;
;; 1. Environment options are collected once at the very beginning of
;;    the process, out of the original buffer and configuration.
;;    Collecting them is handled by `org-export-get-environment'
;;    function.
;;
;;    Most environment options are defined through the
;;    `org-export-options-alist' variable.
;;
;; 2. Tree properties are extracted directly from the parsed tree,
;;    just before export, by `org-export-collect-tree-properties'.
;;
;; Here is the full list of properties available during transcode
;; process, with their category and their value type.
;;
;; + `:author' :: Author's name.
;;   - category :: option
;;   - type :: string
;;
;; + `:back-end' :: Current back-end used for transcoding.
;;   - category :: tree
;;   - type :: symbol
;;
;; + `:creator' :: String to write as creation information.
;;   - category :: option
;;   - type :: string
;;
;; + `:date' :: String to use as date.
;;   - category :: option
;;   - type :: string
;;
;; + `:description' :: Description text for the current data.
;;   - category :: option
;;   - type :: string
;;
;; + `:email' :: Author's email.
;;   - category :: option
;;   - type :: string
;;
;; + `:exclude-tags' :: Tags for exclusion of subtrees from export
;;      process.
;;   - category :: option
;;   - type :: list of strings
;;
;; + `:exported-data' :: Hash table used for memoizing
;;     `org-export-data'.
;;   - category :: tree
;;   - type :: hash table
;;
;; + `:filetags' :: List of global tags for buffer.  Used by
;;   `org-export-get-tags' to get tags with inheritance.
;;   - category :: option
;;   - type :: list of strings
;;
;; + `:footnote-definition-alist' :: Alist between footnote labels and
;;     their definition, as parsed data.  Only non-inlined footnotes
;;     are represented in this alist.  Also, every definition isn't
;;     guaranteed to be referenced in the parse tree.  The purpose of
;;     this property is to preserve definitions from oblivion
;;     (i.e. when the parse tree comes from a part of the original
;;     buffer), it isn't meant for direct use in a back-end.  To
;;     retrieve a definition relative to a reference, use
;;     `org-export-get-footnote-definition' instead.
;;   - category :: option
;;   - type :: alist (STRING . LIST)
;;
;; + `:headline-levels' :: Maximum level being exported as an
;;      headline.  Comparison is done with the relative level of
;;      headlines in the parse tree, not necessarily with their
;;      actual level.
;;   - category :: option
;;   - type :: integer
;;
;; + `:headline-offset' :: Difference between relative and real level
;;      of headlines in the parse tree.  For example, a value of -1
;;      means a level 2 headline should be considered as level
;;      1 (cf. `org-export-get-relative-level').
;;   - category :: tree
;;   - type :: integer
;;
;; + `:headline-numbering' :: Alist between headlines and their
;;      numbering, as a list of numbers
;;      (cf. `org-export-get-headline-number').
;;   - category :: tree
;;   - type :: alist (INTEGER . LIST)
;;
;; + `:id-alist' :: Alist between ID strings and destination file's
;;      path, relative to current directory.  It is used by
;;      `org-export-resolve-id-link' to resolve ID links targeting an
;;      external file.
;;   - category :: option
;;   - type :: alist (STRING . STRING)
;;
;; + `:ignore-list' :: List of elements and objects that should be
;;      ignored during export.
;;   - category :: tree
;;   - type :: list of elements and objects
;;
;; + `:input-file' :: Full path to input file, if any.
;;   - category :: option
;;   - type :: string or nil
;;
;; + `:keywords' :: List of keywords attached to data.
;;   - category :: option
;;   - type :: string
;;
;; + `:language' :: Default language used for translations.
;;   - category :: option
;;   - type :: string
;;
;; + `:parse-tree' :: Whole parse tree, available at any time during
;;      transcoding.
;;   - category :: option
;;   - type :: list (as returned by `org-element-parse-buffer')
;;
;; + `:preserve-breaks' :: Non-nil means transcoding should preserve
;;      all line breaks.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:section-numbers' :: Non-nil means transcoding should add
;;      section numbers to headlines.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:select-tags' :: List of tags enforcing inclusion of sub-trees
;;      in transcoding.  When such a tag is present, subtrees without
;;      it are de facto excluded from the process.  See
;;      `use-select-tags'.
;;   - category :: option
;;   - type :: list of strings
;;
;; + `:time-stamp-file' :: Non-nil means transcoding should insert
;;      a time stamp in the output.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:translate-alist' :: Alist between element and object types and
;;      transcoding functions relative to the current back-end.
;;      Special keys `template' and `plain-text' are also possible.
;;   - category :: option
;;   - type :: alist (SYMBOL . FUNCTION)
;;
;; + `:with-archived-trees' :: Non-nil when archived subtrees should
;;      also be transcoded.  If it is set to the `headline' symbol,
;;      only the archived headline's name is retained.
;;   - category :: option
;;   - type :: symbol (nil, t, `headline')
;;
;; + `:with-author' :: Non-nil means author's name should be included
;;      in the output.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-clocks' :: Non-nil means clock keywords should be exported.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-creator' :: Non-nil means a creation sentence should be
;;      inserted at the end of the transcoded string.  If the value
;;      is `comment', it should be commented.
;;   - category :: option
;;   - type :: symbol (`comment', nil, t)
;;
;; + `:with-date' :: Non-nil means output should contain a date.
;;   - category :: option
;;   - type :. symbol (nil, t)
;;
;; + `:with-drawers' :: Non-nil means drawers should be exported.  If
;;      its value is a list of names, only drawers with such names
;;      will be transcoded.  If that list starts with `not', drawer
;;      with these names will be skipped.
;;   - category :: option
;;   - type :: symbol (nil, t) or list of strings
;;
;; + `:with-email' :: Non-nil means output should contain author's
;;                   email.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-emphasize' :: Non-nil means emphasized text should be
;;      interpreted.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-fixed-width' :: Non-nil if transcoder should interpret
;;      strings starting with a colon as a fixed-with (verbatim) area.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-footnotes' :: Non-nil if transcoder should interpret
;;      footnotes.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-latex' :: Non-nil means `latex-environment' elements and
;;    `latex-fragment' objects should appear in export output.  When
;;    this property is set to `verbatim', they will be left as-is.
;;    - category :: option
;;    - symbol (`verbatim', nil, t)
;;
;; + `:with-plannings' :: Non-nil means transcoding should include
;;      planning info.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-priority' :: Non-nil means transcoding should include
;;      priority cookies.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-smart-quotes' :: Non-nil means activate smart quotes in
;;      plain text.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-special-strings' :: Non-nil means transcoding should
;;      interpret special strings in plain text.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-sub-superscript' :: Non-nil means transcoding should
;;      interpret subscript and superscript.  With a value of "{}",
;;      only interpret those using curly brackets.
;;   - category :: option
;;   - type :: symbol (nil, {}, t)
;;
;; + `:with-tables' :: Non-nil means transcoding should interpret
;;      tables.
;;   - category :: option
;;   - type :: symbol (nil, t)
;;
;; + `:with-tags' :: Non-nil means transcoding should keep tags in
;;      headlines.  A `not-in-toc' value will remove them from the
;;      table of contents, if any, nonetheless.
;;   - category :: option
;;   - type :: symbol (nil, t, `not-in-toc')
;;
;; + `:with-tasks' :: Non-nil means transcoding should include
;;      headlines with a TODO keyword.  A `todo' value will only
;;      include headlines with a todo type keyword while a `done'
;;      value will do the contrary.  If a list of strings is provided,
;;      only tasks with keywords belonging to that list will be kept.
;;   - category :: option
;;   - type :: symbol (t, todo, done, nil) or list of strings
;;
;; + `:with-timestamps' :: Non-nil means transcoding should include
;;      time stamps.  Special value `active' (resp. `inactive') ask to
;;      export only active (resp. inactive) timestamps.  Otherwise,
;;      completely remove them.
;;   - category :: option
;;   - type :: symbol: (`active', `inactive', t, nil)
;;
;; + `:with-toc' :: Non-nil means that a table of contents has to be
;;      added to the output.  An integer value limits its depth.
;;   - category :: option
;;   - type :: symbol (nil, t or integer)
;;
;; + `:with-todo-keywords' :: Non-nil means transcoding should
;;      include TODO keywords.
;;   - category :: option
;;   - type :: symbol (nil, t)


;;;; Environment Options
;;
;; Environment options encompass all parameters defined outside the
;; scope of the parsed data.  They come from five sources, in
;; increasing precedence order:
;;
;; - Global variables,
;; - Buffer's attributes,
;; - Options keyword symbols,
;; - Buffer keywords,
;; - Subtree properties.
;;
;; The central internal function with regards to environment options
;; is `org-export-get-environment'.  It updates global variables with
;; "#+BIND:" keywords, then retrieve and prioritize properties from
;; the different sources.
;;
;;  The internal functions doing the retrieval are:
;;  `org-export--get-global-options',
;;  `org-export--get-buffer-attributes',
;;  `org-export--parse-option-keyword',
;;  `org-export--get-subtree-options' and
;;  `org-export--get-inbuffer-options'
;;
;; Also, `org-export--confirm-letbind' and `org-export--install-letbind'
;; take care of the part relative to "#+BIND:" keywords.

(defun org-export-get-environment (&optional backend subtreep ext-plist)
  "Collect export options from the current buffer.

Optional argument BACKEND is a symbol specifying which back-end
specific options to read, if any.

When optional argument SUBTREEP is non-nil, assume the export is
done against the current sub-tree.

Third optional argument EXT-PLIST is a property list with
external parameters overriding Org default settings, but still
inferior to file-local settings."
  ;; First install #+BIND variables.
  (org-export--install-letbind-maybe)
  ;; Get and prioritize export options...
  (org-combine-plists
   ;; ... from global variables...
   (org-export--get-global-options backend)
   ;; ... from an external property list...
   ext-plist
   ;; ... from in-buffer settings...
   (org-export--get-inbuffer-options
    backend
    (and buffer-file-name (org-remove-double-quotes buffer-file-name)))
   ;; ... and from subtree, when appropriate.
   (and subtreep (org-export--get-subtree-options backend))
   ;; Eventually add misc. properties.
   (list
    :back-end
    backend
    :translate-alist
    (org-export-backend-translate-table backend)
    :footnote-definition-alist
    ;; Footnotes definitions must be collected in the original
    ;; buffer, as there's no insurance that they will still be in
    ;; the parse tree, due to possible narrowing.
    (let (alist)
      (org-with-wide-buffer
       (goto-char (point-min))
       (while (re-search-forward org-footnote-definition-re nil t)
	 (let ((def (save-match-data (org-element-at-point))))
	   (when (eq (org-element-type def) 'footnote-definition)
	     (push
	      (cons (org-element-property :label def)
		    (let ((cbeg (org-element-property :contents-begin def)))
		      (when cbeg
			(org-element--parse-elements
			 cbeg (org-element-property :contents-end def)
			 nil nil nil nil (list 'org-data nil)))))
	      alist))))
       alist))
    :id-alist
    ;; Collect id references.
    (let (alist)
      (org-with-wide-buffer
       (goto-char (point-min))
       (while (re-search-forward "\\[\\[id:\\S-+?\\]" nil t)
	 (let ((link (org-element-context)))
	   (when (eq (org-element-type link) 'link)
	     (let* ((id (org-element-property :path link))
		    (file (org-id-find-id-file id)))
	       (when file
		 (push (cons id (file-relative-name file)) alist)))))))
      alist))))

(defun org-export--parse-option-keyword (options &optional backend)
  "Parse an OPTIONS line and return values as a plist.
Optional argument BACKEND is a symbol specifying which back-end
specific items to read, if any."
  (let* ((all
	  ;; Priority is given to back-end specific options.
	  (append (and backend (org-export-backend-options backend))
		  org-export-options-alist))
	 plist)
    (dolist (option all)
      (let ((property (car option))
	    (item (nth 2 option)))
	(when (and item
		   (not (plist-member plist property))
		   (string-match (concat "\\(\\`\\|[ \t]\\)"
					 (regexp-quote item)
					 ":\\(([^)\n]+)\\|[^ \t\n\r;,.]*\\)")
				 options))
	  (setq plist (plist-put plist
				 property
				 (car (read-from-string
				       (match-string 2 options))))))))
    plist))

(defun org-export--get-subtree-options (&optional backend)
  "Get export options in subtree at point.
Optional argument BACKEND is a symbol specifying back-end used
for export.  Return options as a plist."
  ;; For each buffer keyword, create an headline property setting the
  ;; same property in communication channel. The name for the property
  ;; is the keyword with "EXPORT_" appended to it.
  (org-with-wide-buffer
   (let (prop plist)
     ;; Make sure point is at an heading.
     (if (org-at-heading-p) (org-up-heading-safe) (org-back-to-heading t))
     ;; Take care of EXPORT_TITLE. If it isn't defined, use headline's
     ;; title as its fallback value.
     (when (setq prop (or (org-entry-get (point) "EXPORT_TITLE")
			  (progn (looking-at org-todo-line-regexp)
				 (org-match-string-no-properties 3))))
       (setq plist
	     (plist-put
	      plist :title
	      (org-element-parse-secondary-string
	       prop (org-element-restriction 'keyword)))))
     ;; EXPORT_OPTIONS are parsed in a non-standard way.
     (when (setq prop (org-entry-get (point) "EXPORT_OPTIONS"))
       (setq plist
	     (nconc plist (org-export--parse-option-keyword prop backend))))
     ;; Handle other keywords.  TITLE keyword is excluded as it has
     ;; been handled already.
     (let ((seen '("TITLE")))
       (mapc
	(lambda (option)
	  (let ((property (car option))
		(keyword (nth 1 option)))
	    (when (and keyword (not (member keyword seen)))
	      (let* ((subtree-prop (concat "EXPORT_" keyword))
		     ;; Export properties are not case-sensitive.
		     (value (let ((case-fold-search t))
			      (org-entry-get (point) subtree-prop))))
		(push keyword seen)
		(when (and value (not (plist-member plist property)))
		  (setq plist
			(plist-put
			 plist
			 property
			 (cond
			  ;; Parse VALUE if required.
			  ((member keyword org-element-document-properties)
			   (org-element-parse-secondary-string
			    value (org-element-restriction 'keyword)))
			  ;; If BEHAVIOUR is `split' expected value is
			  ;; a list of strings, not a string.
			  ((eq (nth 4 option) 'split) (org-split-string value))
			  (t value)))))))))
	;; Look for both general keywords and back-end specific
	;; options, with priority given to the latter.
	(append (and backend (org-export-backend-options backend))
		org-export-options-alist)))
     ;; Return value.
     plist)))

(defun org-export--get-inbuffer-options (&optional backend files)
  "Return current buffer export options, as a plist.

Optional argument BACKEND, when non-nil, is a symbol specifying
which back-end specific options should also be read in the
process.

Optional argument FILES is a list of setup files names read so
far, used to avoid circular dependencies.

Assume buffer is in Org mode.  Narrowing, if any, is ignored."
  (org-with-wide-buffer
   (goto-char (point-min))
   (let ((case-fold-search t) plist)
     ;; 1. Special keywords, as in `org-export-special-keywords'.
     (let ((special-re
	    (format "^[ \t]*#\\+%s:" (regexp-opt org-export-special-keywords))))
       (while (re-search-forward special-re nil t)
	 (let ((element (org-element-at-point)))
	   (when (eq (org-element-type element) 'keyword)
	     (let* ((key (org-element-property :key element))
		    (val (org-element-property :value element))
		    (prop
		     (cond
		      ((equal key "SETUPFILE")
		       (let ((file
			      (expand-file-name
			       (org-remove-double-quotes (org-trim val)))))
			 ;; Avoid circular dependencies.
			 (unless (member file files)
			   (with-temp-buffer
			     (insert (org-file-contents file 'noerror))
			     (org-mode)
			     (org-export--get-inbuffer-options
			      backend (cons file files))))))
		      ((equal key "OPTIONS")
		       (org-export--parse-option-keyword val backend))
		      ((equal key "FILETAGS")
		       (list :filetags
			     (org-uniquify
			      (append (org-split-string val ":")
				      (plist-get plist :filetags))))))))
	       (setq plist (org-combine-plists plist prop)))))))
     ;; 2. Standard options, as in `org-export-options-alist'.
     (let* ((all (append
		  ;; Priority is given to back-end specific options.
		  (and backend (org-export-backend-options backend))
		  org-export-options-alist)))
       (dolist (option all)
	 (let ((prop (car option)))
	   (when (and (nth 1 option) (not (plist-member plist prop)))
	     (goto-char (point-min))
	     (let ((opt-re (format "^[ \t]*#\\+%s:" (nth 1 option)))
		   (behaviour (nth 4 option)))
	       (while (re-search-forward opt-re nil t)
		 (let ((element (org-element-at-point)))
		   (when (eq (org-element-type element) 'keyword)
		     (let((key (org-element-property :key element))
			  (val (org-element-property :value element)))
		       (setq plist
			     (plist-put
			      plist (car option)
			      ;; Handle value depending on specified
			      ;; BEHAVIOUR.
			      (case behaviour
				(space
				 (if (not (plist-get plist prop)) (org-trim val)
				   (concat (plist-get plist prop)
					   " "
					   (org-trim val))))
				(newline
				 (org-trim (concat (plist-get plist prop)
						   "\n"
						   (org-trim val))))
				(split `(,@(plist-get plist prop)
					 ,@(org-split-string val)))
				('t val)
				(otherwise
				 (if (not (plist-member plist prop)) val
				   (plist-get plist prop))))))))))))))
       ;; Parse keywords specified in
       ;; `org-element-document-properties'.
       (mapc
	(lambda (key)
	  ;; Find the property associated to the keyword.
	  (let* ((prop (catch 'found
			 (mapc (lambda (option)
				 (when (equal (nth 1 option) key)
				   (throw 'found (car option))))
			       all)))
		 (value (and prop (plist-get plist prop))))
	    (when (stringp value)
	      (setq plist
		    (plist-put
		     plist prop
		     (org-element-parse-secondary-string
		      value (org-element-restriction 'keyword)))))))
	org-element-document-properties))
     ;; 3. Return final value.
     plist)))

(defun org-export--get-buffer-attributes ()
  "Return properties related to buffer attributes, as a plist."
  (let ((visited-file (buffer-file-name (buffer-base-buffer))))
    (list
     ;; Store full path of input file name, or nil.  For internal use.
     :input-file visited-file
     :title (or (and visited-file
		     (file-name-sans-extension
		      (file-name-nondirectory visited-file)))
		(buffer-name (buffer-base-buffer))))))

(defun org-export--get-global-options (&optional backend)
  "Return global export options as a plist.

Optional argument BACKEND, if non-nil, is a symbol specifying
which back-end specific export options should also be read in the
process."
  (let ((all
	 ;; Priority is given to back-end specific options.
	 (append (and backend (org-export-backend-options backend))
		 org-export-options-alist))
	plist)
    (mapc
     (lambda (cell)
       (let ((prop (car cell)))
	 (unless (plist-member plist prop)
	   (setq plist
		 (plist-put
		  plist
		  prop
		  ;; Eval default value provided.  If keyword is a member
		  ;; of `org-element-document-properties', parse it as
		  ;; a secondary string before storing it.
		  (let ((value (eval (nth 3 cell))))
		    (if (not (stringp value)) value
		      (let ((keyword (nth 1 cell)))
			(if (not (member keyword org-element-document-properties))
			    value
			  (org-element-parse-secondary-string
			   value (org-element-restriction 'keyword)))))))))))
     all)
    ;; Return value.
    plist))

(defun org-export--install-letbind-maybe ()
  "Install the values from #+BIND lines as local variables.
Variables must be installed before in-buffer options are
retrieved."
  (when org-export-allow-bind-keywords
    (let ((case-fold-search t) letbind)
      (org-with-wide-buffer
       (goto-char (point-min))
       (while (re-search-forward "^[ \t]*#\\+BIND:" nil t)
	 (let* ((element (org-element-at-point))
		(value (org-element-property :value element)))
	   (when (and (eq (org-element-type element) 'keyword)
		      (not (equal value  "")))
	     (push (read (format "(%s)" value)) letbind)))))
      (dolist (pair (nreverse letbind))
	(org-set-local (car pair) (nth 1 pair))))))


;;;; Tree Properties
;;
;; Tree properties are information extracted from parse tree.  They
;; are initialized at the beginning of the transcoding process by
;; `org-export-collect-tree-properties'.
;;
;; Dedicated functions focus on computing the value of specific tree
;; properties during initialization.  Thus,
;; `org-export--populate-ignore-list' lists elements and objects that
;; should be skipped during export, `org-export--get-min-level' gets
;; the minimal exportable level, used as a basis to compute relative
;; level for headlines.  Eventually
;; `org-export--collect-headline-numbering' builds an alist between
;; headlines and their numbering.

(defun org-export-collect-tree-properties (data info)
  "Extract tree properties from parse tree.

DATA is the parse tree from which information is retrieved.  INFO
is a list holding export options.

Following tree properties are set or updated:

`:exported-data' Hash table used to memoize results from
                 `org-export-data'.

`:footnote-definition-alist' List of footnotes definitions in
                   original buffer and current parse tree.

`:headline-offset' Offset between true level of headlines and
		   local level.  An offset of -1 means an headline
		   of level 2 should be considered as a level
		   1 headline in the context.

`:headline-numbering' Alist of all headlines as key an the
		      associated numbering as value.

`:ignore-list'     List of elements that should be ignored during
                   export.

Return updated plist."
  ;; Install the parse tree in the communication channel, in order to
  ;; use `org-export-get-genealogy' and al.
  (setq info (plist-put info :parse-tree data))
  ;; Get the list of elements and objects to ignore, and put it into
  ;; `:ignore-list'.  Do not overwrite any user ignore that might have
  ;; been done during parse tree filtering.
  (setq info
	(plist-put info
		   :ignore-list
		   (append (org-export--populate-ignore-list data info)
			   (plist-get info :ignore-list))))
  ;; Compute `:headline-offset' in order to be able to use
  ;; `org-export-get-relative-level'.
  (setq info
	(plist-put info
		   :headline-offset
		   (- 1 (org-export--get-min-level data info))))
  ;; Update footnotes definitions list with definitions in parse tree.
  ;; This is required since buffer expansion might have modified
  ;; boundaries of footnote definitions contained in the parse tree.
  ;; This way, definitions in `footnote-definition-alist' are bound to
  ;; match those in the parse tree.
  (let ((defs (plist-get info :footnote-definition-alist)))
    (org-element-map data 'footnote-definition
      (lambda (fn)
	(push (cons (org-element-property :label fn)
		    `(org-data nil ,@(org-element-contents fn)))
	      defs)))
    (setq info (plist-put info :footnote-definition-alist defs)))
  ;; Properties order doesn't matter: get the rest of the tree
  ;; properties.
  (nconc
   `(:headline-numbering ,(org-export--collect-headline-numbering data info)
     :exported-data ,(make-hash-table :test 'eq :size 4001))
   info))

(defun org-export--get-min-level (data options)
  "Return minimum exportable headline's level in DATA.
DATA is parsed tree as returned by `org-element-parse-buffer'.
OPTIONS is a plist holding export options."
  (catch 'exit
    (let ((min-level 10000))
      (mapc
       (lambda (blob)
	 (when (and (eq (org-element-type blob) 'headline)
		    (not (memq blob (plist-get options :ignore-list))))
	   (setq min-level
		 (min (org-element-property :level blob) min-level)))
	 (when (= min-level 1) (throw 'exit 1)))
       (org-element-contents data))
      ;; If no headline was found, for the sake of consistency, set
      ;; minimum level to 1 nonetheless.
      (if (= min-level 10000) 1 min-level))))

(defun org-export--collect-headline-numbering (data options)
  "Return numbering of all exportable headlines in a parse tree.

DATA is the parse tree.  OPTIONS is the plist holding export
options.

Return an alist whose key is an headline and value is its
associated numbering \(in the shape of a list of numbers\)."
  (let ((numbering (make-vector org-export-max-depth 0)))
    (org-element-map data 'headline
      (lambda (headline)
	(let ((relative-level
	       (1- (org-export-get-relative-level headline options))))
	  (cons
	   headline
	   (loop for n across numbering
		 for idx from 0 to org-export-max-depth
		 when (< idx relative-level) collect n
		 when (= idx relative-level) collect (aset numbering idx (1+ n))
		 when (> idx relative-level) do (aset numbering idx 0)))))
      options)))

(defun org-export--populate-ignore-list (data options)
  "Return list of elements and objects to ignore during export.
DATA is the parse tree to traverse.  OPTIONS is the plist holding
export options."
  (let* (ignore
	 walk-data
	 ;; First find trees containing a select tag, if any.
	 (selected (org-export--selected-trees data options))
	 (walk-data
	  (lambda (data)
	    ;; Collect ignored elements or objects into IGNORE-LIST.
	    (let ((type (org-element-type data)))
	      (if (org-export--skip-p data options selected) (push data ignore)
		(if (and (eq type 'headline)
			 (eq (plist-get options :with-archived-trees) 'headline)
			 (org-element-property :archivedp data))
		    ;; If headline is archived but tree below has
		    ;; to be skipped, add it to ignore list.
		    (mapc (lambda (e) (push e ignore))
			  (org-element-contents data))
		  ;; Move into secondary string, if any.
		  (let ((sec-prop
			 (cdr (assq type org-element-secondary-value-alist))))
		    (when sec-prop
		      (mapc walk-data (org-element-property sec-prop data))))
		  ;; Move into recursive objects/elements.
		  (mapc walk-data (org-element-contents data))))))))
    ;; Main call.
    (funcall walk-data data)
    ;; Return value.
    ignore))

(defun org-export--selected-trees (data info)
  "Return list of headlines containing a select tag in their tree.
DATA is parsed data as returned by `org-element-parse-buffer'.
INFO is a plist holding export options."
  (let* (selected-trees
	 walk-data			; for byte-compiler.
	 (walk-data
	  (function
	   (lambda (data genealogy)
	     (case (org-element-type data)
	       (org-data (mapc (lambda (el) (funcall walk-data el genealogy))
			       (org-element-contents data)))
	       (headline
		(let ((tags (org-element-property :tags data)))
		  (if (loop for tag in (plist-get info :select-tags)
			    thereis (member tag tags))
		      ;; When a select tag is found, mark full
		      ;; genealogy and every headline within the tree
		      ;; as acceptable.
		      (setq selected-trees
			    (append
			     genealogy
			     (org-element-map data 'headline 'identity)
			     selected-trees))
		    ;; Else, continue searching in tree, recursively.
		    (mapc
		     (lambda (el) (funcall walk-data el (cons data genealogy)))
		     (org-element-contents data))))))))))
    (funcall walk-data data nil) selected-trees))

(defun org-export--skip-p (blob options selected)
  "Non-nil when element or object BLOB should be skipped during export.
OPTIONS is the plist holding export options.  SELECTED, when
non-nil, is a list of headlines belonging to a tree with a select
tag."
  (case (org-element-type blob)
    (clock (not (plist-get options :with-clocks)))
    (drawer
     (let ((with-drawers-p (plist-get options :with-drawers)))
       (or (not with-drawers-p)
	   (and (consp with-drawers-p)
		;; If `:with-drawers' value starts with `not', ignore
		;; every drawer whose name belong to that list.
		;; Otherwise, ignore drawers whose name isn't in that
		;; list.
		(let ((name (org-element-property :drawer-name blob)))
		  (if (eq (car with-drawers-p) 'not)
		      (member-ignore-case name (cdr with-drawers-p))
		    (not (member-ignore-case name with-drawers-p))))))))
    (headline
     (let ((with-tasks (plist-get options :with-tasks))
	   (todo (org-element-property :todo-keyword blob))
	   (todo-type (org-element-property :todo-type blob))
	   (archived (plist-get options :with-archived-trees))
	   (tags (org-element-property :tags blob)))
       (or
	;; Ignore subtrees with an exclude tag.
	(loop for k in (plist-get options :exclude-tags)
	      thereis (member k tags))
	;; When a select tag is present in the buffer, ignore any tree
	;; without it.
	(and selected (not (memq blob selected)))
	;; Ignore commented sub-trees.
	(org-element-property :commentedp blob)
	;; Ignore archived subtrees if `:with-archived-trees' is nil.
	(and (not archived) (org-element-property :archivedp blob))
	;; Ignore tasks, if specified by `:with-tasks' property.
	(and todo
	     (or (not with-tasks)
		 (and (memq with-tasks '(todo done))
		      (not (eq todo-type with-tasks)))
		 (and (consp with-tasks) (not (member todo with-tasks))))))))
    (inlinetask (not (plist-get options :with-inlinetasks)))
    ((latex-environment latex-fragment) (not (plist-get options :with-latex)))
    (planning (not (plist-get options :with-plannings)))
    (statistics-cookie (not (plist-get options :with-statistics-cookies)))
    (table-cell
     (and (org-export-table-has-special-column-p
	   (org-export-get-parent-table blob))
	  (not (org-export-get-previous-element blob options))))
    (table-row (org-export-table-row-is-special-p blob options))
    (timestamp
     (case (plist-get options :with-timestamps)
       ;; No timestamp allowed.
       ('nil t)
       ;; Only active timestamps allowed and the current one isn't
       ;; active.
       (active
	(not (memq (org-element-property :type blob)
		   '(active active-range))))
       ;; Only inactive timestamps allowed and the current one isn't
       ;; inactive.
       (inactive
	(not (memq (org-element-property :type blob)
		   '(inactive inactive-range))))))))



;;; The Transcoder
;;
;; `org-export-data' reads a parse tree (obtained with, i.e.
;; `org-element-parse-buffer') and transcodes it into a specified
;; back-end output.  It takes care of filtering out elements or
;; objects according to export options and organizing the output blank
;; lines and white space are preserved.  The function memoizes its
;; results, so it is cheap to call it within translators.
;;
;; It is possible to modify locally the back-end used by
;; `org-export-data' or even use a temporary back-end by using
;; `org-export-data-with-translations' and
;; `org-export-data-with-backend'.
;;
;; Internally, three functions handle the filtering of objects and
;; elements during the export.  In particular,
;; `org-export-ignore-element' marks an element or object so future
;; parse tree traversals skip it, `org-export--interpret-p' tells which
;; elements or objects should be seen as real Org syntax and
;; `org-export-expand' transforms the others back into their original
;; shape
;;
;; `org-export-transcoder' is an accessor returning appropriate
;; translator function for a given element or object.

(defun org-export-transcoder (blob info)
  "Return appropriate transcoder for BLOB.
INFO is a plist containing export directives."
  (let ((type (org-element-type blob)))
    ;; Return contents only for complete parse trees.
    (if (eq type 'org-data) (lambda (blob contents info) contents)
      (let ((transcoder (cdr (assq type (plist-get info :translate-alist)))))
	(and (functionp transcoder) transcoder)))))

(defun org-export-data (data info)
  "Convert DATA into current back-end format.

DATA is a parse tree, an element or an object or a secondary
string.  INFO is a plist holding export options.

Return transcoded string."
  (let ((memo (gethash data (plist-get info :exported-data) 'no-memo)))
    (if (not (eq memo 'no-memo)) memo
      (let* ((type (org-element-type data))
	     (results
	      (cond
	       ;; Ignored element/object.
	       ((memq data (plist-get info :ignore-list)) nil)
	       ;; Plain text.
	       ((eq type 'plain-text)
		(org-export-filter-apply-functions
		 (plist-get info :filter-plain-text)
		 (let ((transcoder (org-export-transcoder data info)))
		   (if transcoder (funcall transcoder data info) data))
		 info))
	       ;; Uninterpreted element/object: change it back to Org
	       ;; syntax and export again resulting raw string.
	       ((not (org-export--interpret-p data info))
		(org-export-data
		 (org-export-expand
		  data
		  (mapconcat (lambda (blob) (org-export-data blob info))
			     (org-element-contents data)
			     ""))
		 info))
	       ;; Secondary string.
	       ((not type)
		(mapconcat (lambda (obj) (org-export-data obj info)) data ""))
	       ;; Element/Object without contents or, as a special case,
	       ;; headline with archive tag and archived trees restricted
	       ;; to title only.
	       ((or (not (org-element-contents data))
		    (and (eq type 'headline)
			 (eq (plist-get info :with-archived-trees) 'headline)
			 (org-element-property :archivedp data)))
		(let ((transcoder (org-export-transcoder data info)))
		  (and (functionp transcoder)
		       (funcall transcoder data nil info))))
	       ;; Element/Object with contents.
	       (t
		(let ((transcoder (org-export-transcoder data info)))
		  (when transcoder
		    (let* ((greaterp (memq type org-element-greater-elements))
			   (objectp
			    (and (not greaterp)
				 (memq type org-element-recursive-objects)))
			   (contents
			    (mapconcat
			     (lambda (element) (org-export-data element info))
			     (org-element-contents
			      (if (or greaterp objectp) data
				;; Elements directly containing objects
				;; must have their indentation normalized
				;; first.
				(org-element-normalize-contents
				 data
				 ;; When normalizing contents of the first
				 ;; paragraph in an item or a footnote
				 ;; definition, ignore first line's
				 ;; indentation: there is none and it
				 ;; might be misleading.
				 (when (eq type 'paragraph)
				   (let ((parent (org-export-get-parent data)))
				     (and
				      (eq (car (org-element-contents parent))
					  data)
				      (memq (org-element-type parent)
					    '(footnote-definition item))))))))
			     "")))
		      (funcall transcoder data
			       (if (not greaterp) contents
				 (org-element-normalize-string contents))
			       info))))))))
	;; Final result will be memoized before being returned.
	(puthash
	 data
	 (cond
	  ((not results) nil)
	  ((memq type '(org-data plain-text nil)) results)
	  ;; Append the same white space between elements or objects as in
	  ;; the original buffer, and call appropriate filters.
	  (t
	   (let ((results
		  (org-export-filter-apply-functions
		   (plist-get info (intern (format ":filter-%s" type)))
		   (let ((post-blank (or (org-element-property :post-blank data)
					 0)))
		     (if (memq type org-element-all-elements)
			 (concat (org-element-normalize-string results)
				 (make-string post-blank ?\n))
		       (concat results (make-string post-blank ? ))))
		   info)))
	     results)))
	 (plist-get info :exported-data))))))

(defun org-export-data-with-translations (data translations info)
  "Convert DATA into another format using a given translation table.
DATA is an element, an object, a secondary string or a string.
TRANSLATIONS is an alist between element or object types and
a functions handling them.  See `org-export-define-backend' for
more information.  INFO is a plist used as a communication
channel."
  (org-export-data
   data
   ;; Set-up a new communication channel with TRANSLATIONS as the
   ;; translate table and a new hash table for memoization.
   (org-combine-plists
    info
    (list :translate-alist translations
	  ;; Size of the hash table is reduced since this function
	  ;; will probably be used on short trees.
	  :exported-data (make-hash-table :test 'eq :size 401)))))

(defun org-export-data-with-backend (data backend info)
  "Convert DATA into BACKEND format.

DATA is an element, an object, a secondary string or a string.
BACKEND is a symbol.  INFO is a plist used as a communication
channel.

Unlike to `org-export-with-backend', this function will
recursively convert DATA using BACKEND translation table."
  (org-export-barf-if-invalid-backend backend)
  (org-export-data-with-translations
   data (org-export-backend-translate-table backend) info))

(defun org-export--interpret-p (blob info)
  "Non-nil if element or object BLOB should be interpreted during export.
If nil, BLOB will appear as raw Org syntax.  Check is done
according to export options INFO, stored as a plist."
  (case (org-element-type blob)
    ;; ... entities...
    (entity (plist-get info :with-entities))
    ;; ... emphasis...
    ((bold italic strike-through underline)
     (plist-get info :with-emphasize))
    ;; ... fixed-width areas.
    (fixed-width (plist-get info :with-fixed-width))
    ;; ... footnotes...
    ((footnote-definition footnote-reference)
     (plist-get info :with-footnotes))
    ;; ... LaTeX environments and fragments...
    ((latex-environment latex-fragment)
     (let ((with-latex-p (plist-get info :with-latex)))
       (and with-latex-p (not (eq with-latex-p 'verbatim)))))
    ;; ... sub/superscripts...
    ((subscript superscript)
     (let ((sub/super-p (plist-get info :with-sub-superscript)))
       (if (eq sub/super-p '{})
	   (org-element-property :use-brackets-p blob)
	 sub/super-p)))
    ;; ... tables...
    (table (plist-get info :with-tables))
    (otherwise t)))

(defun org-export-expand (blob contents)
  "Expand a parsed element or object to its original state.
BLOB is either an element or an object.  CONTENTS is its
contents, as a string or nil."
  (funcall
   (intern (format "org-element-%s-interpreter" (org-element-type blob)))
   blob contents))

(defun org-export-ignore-element (element info)
  "Add ELEMENT to `:ignore-list' in INFO.

Any element in `:ignore-list' will be skipped when using
`org-element-map'.  INFO is modified by side effects."
  (plist-put info :ignore-list (cons element (plist-get info :ignore-list))))



;;; The Filter System
;;
;; Filters allow end-users to tweak easily the transcoded output.
;; They are the functional counterpart of hooks, as every filter in
;; a set is applied to the return value of the previous one.
;;
;; Every set is back-end agnostic.  Although, a filter is always
;; called, in addition to the string it applies to, with the back-end
;; used as argument, so it's easy for the end-user to add back-end
;; specific filters in the set.  The communication channel, as
;; a plist, is required as the third argument.
;;
;; From the developer side, filters sets can be installed in the
;; process with the help of `org-export-define-backend', which
;; internally stores filters as an alist.  Each association has a key
;; among the following symbols and a function or a list of functions
;; as value.
;;
;; - `:filter-options' applies to the property list containing export
;;   options.  Unlike to other filters, functions in this list accept
;;   two arguments instead of three: the property list containing
;;   export options and the back-end.  Users can set its value through
;;   `org-export-filter-options-functions' variable.
;;
;; - `:filter-parse-tree' applies directly to the complete parsed
;;   tree.  Users can set it through
;;   `org-export-filter-parse-tree-functions' variable.
;;
;; - `:filter-final-output' applies to the final transcoded string.
;;   Users can set it with `org-export-filter-final-output-functions'
;;   variable
;;
;; - `:filter-plain-text' applies to any string not recognized as Org
;;   syntax.  `org-export-filter-plain-text-functions' allows users to
;;   configure it.
;;
;; - `:filter-TYPE' applies on the string returned after an element or
;;   object of type TYPE has been transcoded.  An user can modify
;;   `org-export-filter-TYPE-functions'
;;
;; All filters sets are applied with
;; `org-export-filter-apply-functions' function.  Filters in a set are
;; applied in a LIFO fashion.  It allows developers to be sure that
;; their filters will be applied first.
;;
;; Filters properties are installed in communication channel with
;; `org-export-install-filters' function.
;;
;; Eventually, two hooks (`org-export-before-processing-hook' and
;; `org-export-before-parsing-hook') are run at the beginning of the
;; export process and just before parsing to allow for heavy structure
;; modifications.


;;;; Hooks

(defvar org-export-before-processing-hook nil
  "Hook run at the beginning of the export process.

This is run before include keywords and macros are expanded and
Babel code blocks executed, on a copy of the original buffer
being exported.  Visibility and narrowing are preserved.  Point
is at the beginning of the buffer.

Every function in this hook will be called with one argument: the
back-end currently used, as a symbol.")

(defvar org-export-before-parsing-hook nil
  "Hook run before parsing an export buffer.

This is run after include keywords and macros have been expanded
and Babel code blocks executed, on a copy of the original buffer
being exported.  Visibility and narrowing are preserved.  Point
is at the beginning of the buffer.

Every function in this hook will be called with one argument: the
back-end currently used, as a symbol.")


;;;; Special Filters

(defvar org-export-filter-options-functions nil
  "List of functions applied to the export options.
Each filter is called with two arguments: the export options, as
a plist, and the back-end, as a symbol.  It must return
a property list containing export options.")

(defvar org-export-filter-parse-tree-functions nil
  "List of functions applied to the parsed tree.
Each filter is called with three arguments: the parse tree, as
returned by `org-element-parse-buffer', the back-end, as
a symbol, and the communication channel, as a plist.  It must
return the modified parse tree to transcode.")

(defvar org-export-filter-plain-text-functions nil
  "List of functions applied to plain text.
Each filter is called with three arguments: a string which
contains no Org syntax, the back-end, as a symbol, and the
communication channel, as a plist.  It must return a string or
nil.")

(defvar org-export-filter-final-output-functions nil
  "List of functions applied to the transcoded string.
Each filter is called with three arguments: the full transcoded
string, the back-end, as a symbol, and the communication channel,
as a plist.  It must return a string that will be used as the
final export output.")


;;;; Elements Filters

(defvar org-export-filter-babel-call-functions nil
  "List of functions applied to a transcoded babel-call.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-center-block-functions nil
  "List of functions applied to a transcoded center block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-clock-functions nil
  "List of functions applied to a transcoded clock.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-comment-functions nil
  "List of functions applied to a transcoded comment.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-comment-block-functions nil
  "List of functions applied to a transcoded comment-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-diary-sexp-functions nil
  "List of functions applied to a transcoded diary-sexp.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-drawer-functions nil
  "List of functions applied to a transcoded drawer.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-dynamic-block-functions nil
  "List of functions applied to a transcoded dynamic-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-example-block-functions nil
  "List of functions applied to a transcoded example-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-export-block-functions nil
  "List of functions applied to a transcoded export-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-fixed-width-functions nil
  "List of functions applied to a transcoded fixed-width.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-footnote-definition-functions nil
  "List of functions applied to a transcoded footnote-definition.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-headline-functions nil
  "List of functions applied to a transcoded headline.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-horizontal-rule-functions nil
  "List of functions applied to a transcoded horizontal-rule.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-inlinetask-functions nil
  "List of functions applied to a transcoded inlinetask.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-item-functions nil
  "List of functions applied to a transcoded item.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-keyword-functions nil
  "List of functions applied to a transcoded keyword.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-latex-environment-functions nil
  "List of functions applied to a transcoded latex-environment.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-node-property-functions nil
  "List of functions applied to a transcoded node-property.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-paragraph-functions nil
  "List of functions applied to a transcoded paragraph.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-plain-list-functions nil
  "List of functions applied to a transcoded plain-list.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-planning-functions nil
  "List of functions applied to a transcoded planning.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-property-drawer-functions nil
  "List of functions applied to a transcoded property-drawer.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-quote-block-functions nil
  "List of functions applied to a transcoded quote block.
Each filter is called with three arguments: the transcoded quote
data, as a string, the back-end, as a symbol, and the
communication channel, as a plist.  It must return a string or
nil.")

(defvar org-export-filter-quote-section-functions nil
  "List of functions applied to a transcoded quote-section.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-section-functions nil
  "List of functions applied to a transcoded section.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-special-block-functions nil
  "List of functions applied to a transcoded special block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-src-block-functions nil
  "List of functions applied to a transcoded src-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-table-functions nil
  "List of functions applied to a transcoded table.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-table-cell-functions nil
  "List of functions applied to a transcoded table-cell.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-table-row-functions nil
  "List of functions applied to a transcoded table-row.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-verse-block-functions nil
  "List of functions applied to a transcoded verse block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")


;;;; Objects Filters

(defvar org-export-filter-bold-functions nil
  "List of functions applied to transcoded bold text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-code-functions nil
  "List of functions applied to transcoded code text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-entity-functions nil
  "List of functions applied to a transcoded entity.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-export-snippet-functions nil
  "List of functions applied to a transcoded export-snippet.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-footnote-reference-functions nil
  "List of functions applied to a transcoded footnote-reference.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-inline-babel-call-functions nil
  "List of functions applied to a transcoded inline-babel-call.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-inline-src-block-functions nil
  "List of functions applied to a transcoded inline-src-block.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-italic-functions nil
  "List of functions applied to transcoded italic text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-latex-fragment-functions nil
  "List of functions applied to a transcoded latex-fragment.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-line-break-functions nil
  "List of functions applied to a transcoded line-break.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-link-functions nil
  "List of functions applied to a transcoded link.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-macro-functions nil
  "List of functions applied to a transcoded macro.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-radio-target-functions nil
  "List of functions applied to a transcoded radio-target.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-statistics-cookie-functions nil
  "List of functions applied to a transcoded statistics-cookie.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-strike-through-functions nil
  "List of functions applied to transcoded strike-through text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-subscript-functions nil
  "List of functions applied to a transcoded subscript.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-superscript-functions nil
  "List of functions applied to a transcoded superscript.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-target-functions nil
  "List of functions applied to a transcoded target.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-timestamp-functions nil
  "List of functions applied to a transcoded timestamp.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-underline-functions nil
  "List of functions applied to transcoded underline text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")

(defvar org-export-filter-verbatim-functions nil
  "List of functions applied to transcoded verbatim text.
Each filter is called with three arguments: the transcoded data,
as a string, the back-end, as a symbol, and the communication
channel, as a plist.  It must return a string or nil.")


;;;; Filters Tools
;;
;; Internal function `org-export-install-filters' installs filters
;; hard-coded in back-ends (developer filters) and filters from global
;; variables (user filters) in the communication channel.
;;
;; Internal function `org-export-filter-apply-functions' takes care
;; about applying each filter in order to a given data.  It ignores
;; filters returning a nil value but stops whenever a filter returns
;; an empty string.

(defun org-export-filter-apply-functions (filters value info)
  "Call every function in FILTERS.

Functions are called with arguments VALUE, current export
back-end and INFO.  A function returning a nil value will be
skipped.  If it returns the empty string, the process ends and
VALUE is ignored.

Call is done in a LIFO fashion, to be sure that developer
specified filters, if any, are called first."
  (catch 'exit
    (dolist (filter filters value)
      (let ((result (funcall filter value (plist-get info :back-end) info)))
	(cond ((not result) value)
	      ((equal value "") (throw 'exit nil))
	      (t (setq value result)))))))

(defun org-export-install-filters (info)
  "Install filters properties in communication channel.
INFO is a plist containing the current communication channel.
Return the updated communication channel."
  (let (plist)
    ;; Install user defined filters with `org-export-filters-alist'.
    (mapc (lambda (p)
	    (setq plist (plist-put plist (car p) (eval (cdr p)))))
	  org-export-filters-alist)
    ;; Prepend back-end specific filters to that list.
    (mapc (lambda (p)
	    ;; Single values get consed, lists are prepended.
	    (let ((key (car p)) (value (cdr p)))
	      (when value
		(setq plist
		      (plist-put
		       plist key
		       (if (atom value) (cons value (plist-get plist key))
			 (append value (plist-get plist key))))))))
	  (org-export-backend-filters (plist-get info :back-end)))
    ;; Return new communication channel.
    (org-combine-plists info plist)))



;;; Core functions
;;
;; This is the room for the main function, `org-export-as', along with
;; its derivatives, `org-export-to-buffer', `org-export-to-file' and
;; `org-export-string-as'.  They differ either by the way they output
;; the resulting code (for the first two) or by the input type (for
;; the latter).
;;
;; `org-export-output-file-name' is an auxiliary function meant to be
;; used with `org-export-to-file'.  With a given extension, it tries
;; to provide a canonical file name to write export output to.
;;
;; Note that `org-export-as' doesn't really parse the current buffer,
;; but a copy of it (with the same buffer-local variables and
;; visibility), where macros and include keywords are expanded and
;; Babel blocks are executed, if appropriate.
;; `org-export-with-buffer-copy' macro prepares that copy.
;;
;; File inclusion is taken care of by
;; `org-export-expand-include-keyword' and
;; `org-export--prepare-file-contents'.  Structure wise, including
;; a whole Org file in a buffer often makes little sense.  For
;; example, if the file contains an headline and the include keyword
;; was within an item, the item should contain the headline.  That's
;; why file inclusion should be done before any structure can be
;; associated to the file, that is before parsing.

;;;###autoload
(defun org-export-as
  (backend &optional subtreep visible-only body-only ext-plist)
  "Transcode current Org buffer into BACKEND code.

If narrowing is active in the current buffer, only transcode its
narrowed part.

If a region is active, transcode that region.

When optional argument SUBTREEP is non-nil, transcode the
sub-tree at point, extracting information from the headline
properties first.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

When optional argument BODY-ONLY is non-nil, only return body
code, without surrounding template.

Optional argument EXT-PLIST, when provided, is a property list
with external parameters overriding Org default settings, but
still inferior to file-local settings.

Return code as a string."
  ;; Barf if BACKEND isn't registered.
  (org-export-barf-if-invalid-backend backend)
  (save-excursion
    (save-restriction
      ;; Narrow buffer to an appropriate region or subtree for
      ;; parsing.  If parsing subtree, be sure to remove main headline
      ;; too.
      (cond ((org-region-active-p)
	     (narrow-to-region (region-beginning) (region-end)))
	    (subtreep
	     (org-narrow-to-subtree)
	     (goto-char (point-min))
	     (forward-line)
	     (narrow-to-region (point) (point-max))))
      ;; Initialize communication channel with original buffer
      ;; attributes, unavailable in its copy.
      (let ((info (org-export--get-buffer-attributes)) tree)
	;; Update communication channel and get parse tree.  Buffer
	;; isn't parsed directly.  Instead, a temporary copy is
	;; created, where include keywords, macros are expanded and
	;; code blocks are evaluated.
	(org-export-with-buffer-copy
	 ;; Run first hook with current back-end as argument.
	 (run-hook-with-args 'org-export-before-processing-hook backend)
	 (org-export-expand-include-keyword)
	 ;; Update macro templates since #+INCLUDE keywords might have
	 ;; added some new ones.
	 (org-macro-initialize-templates)
	 (org-macro-replace-all org-macro-templates)
	 (org-export-execute-babel-code)
	 ;; Update radio targets since keyword inclusion might have
	 ;; added some more.
	 (org-update-radio-target-regexp)
	 ;; Run last hook with current back-end as argument.
	 (goto-char (point-min))
	 (run-hook-with-args 'org-export-before-parsing-hook backend)
	 ;; Update communication channel with environment.  Also
	 ;; install user's and developer's filters.
	 (setq info
	       (org-export-install-filters
		(org-combine-plists
		 info (org-export-get-environment backend subtreep ext-plist))))
	 ;; Expand export-specific set of macros: {{{author}}},
	 ;; {{{date}}}, {{{email}}} and {{{title}}}.  It must be done
	 ;; once regular macros have been expanded, since document
	 ;; keywords may contain one of them.
	 (org-macro-replace-all
	  (list (cons "author"
		      (org-element-interpret-data (plist-get info :author)))
		(cons "date"
		      (org-element-interpret-data (plist-get info :date)))
		;; EMAIL is not a parsed keyword: store it as-is.
		(cons "email" (or (plist-get info :email) ""))
		(cons "title"
		      (org-element-interpret-data (plist-get info :title)))))
	 ;; Call options filters and update export options.  We do not
	 ;; use `org-export-filter-apply-functions' here since the
	 ;; arity of such filters is different.
	 (dolist (filter (plist-get info :filter-options))
	   (let ((result (funcall filter info backend)))
	     (when result (setq info result))))
	 ;; Parse buffer and call parse-tree filter on it.
	 (setq tree
	       (org-export-filter-apply-functions
		(plist-get info :filter-parse-tree)
		(org-element-parse-buffer nil visible-only) info))
	 ;; Now tree is complete, compute its properties and add them
	 ;; to communication channel.
	 (setq info
	       (org-combine-plists
		info (org-export-collect-tree-properties tree info)))
	 ;; Eventually transcode TREE.  Wrap the resulting string into
	 ;; a template, if needed.  Finally call final-output filter.
	 (let ((body (org-element-normalize-string
		      (or (org-export-data tree info) "")))
	       (template (cdr (assq 'template
				    (plist-get info :translate-alist)))))
	   ;; Remove all text properties since they cannot be
	   ;; retrieved from an external process, and return result.
	   (org-no-properties
	    (org-export-filter-apply-functions
	     (plist-get info :filter-final-output)
	     (if (or (not (functionp template)) body-only) body
	       (funcall template body info))
	     info))))))))

;;;###autoload
(defun org-export-to-buffer
  (backend buffer &optional subtreep visible-only body-only ext-plist)
  "Call `org-export-as' with output to a specified buffer.

BACKEND is the back-end used for transcoding, as a symbol.

BUFFER is the output buffer.  If it already exists, it will be
erased first, otherwise, it will be created.

Optional arguments SUBTREEP, VISIBLE-ONLY, BODY-ONLY and
EXT-PLIST are similar to those used in `org-export-as', which
see.

If `org-export-copy-to-kill-ring' is non-nil, add buffer contents
to kill ring.  Return buffer."
  (let ((out (org-export-as backend subtreep visible-only body-only ext-plist))
	(buffer (get-buffer-create buffer)))
    (with-current-buffer buffer
      (erase-buffer)
      (insert out)
      (goto-char (point-min)))
    ;; Maybe add buffer contents to kill ring.
    (when (and org-export-copy-to-kill-ring (org-string-nw-p out))
      (org-kill-new out))
    ;; Return buffer.
    buffer))

;;;###autoload
(defun org-export-to-file
  (backend file &optional subtreep visible-only body-only ext-plist)
  "Call `org-export-as' with output to a specified file.

BACKEND is the back-end used for transcoding, as a symbol.  FILE
is the name of the output file, as a string.

Optional arguments SUBTREEP, VISIBLE-ONLY, BODY-ONLY and
EXT-PLIST are similar to those used in `org-export-as', which
see.

If `org-export-copy-to-kill-ring' is non-nil, add file contents
to kill ring.  Return output file's name."
  ;; Checks for FILE permissions.  `write-file' would do the same, but
  ;; we'd rather avoid needless transcoding of parse tree.
  (unless (file-writable-p file) (error "Output file not writable"))
  ;; Insert contents to a temporary buffer and write it to FILE.
  (let ((out (org-export-as backend subtreep visible-only body-only ext-plist)))
    (with-temp-buffer
      (insert out)
      (let ((coding-system-for-write org-export-coding-system))
	(write-file file)))
    ;; Maybe add file contents to kill ring.
    (when (and org-export-copy-to-kill-ring (org-string-nw-p out))
      (org-kill-new out)))
  ;; Return full path.
  file)

;;;###autoload
(defun org-export-string-as (string backend &optional body-only ext-plist)
  "Transcode STRING into BACKEND code.

When optional argument BODY-ONLY is non-nil, only return body
code, without preamble nor postamble.

Optional argument EXT-PLIST, when provided, is a property list
with external parameters overriding Org default settings, but
still inferior to file-local settings.

Return code as a string."
  (with-temp-buffer
    (insert string)
    (org-mode)
    (org-export-as backend nil nil body-only ext-plist)))

(defun org-export-output-file-name (extension &optional subtreep pub-dir)
  "Return output file's name according to buffer specifications.

EXTENSION is a string representing the output file extension,
with the leading dot.

With a non-nil optional argument SUBTREEP, try to determine
output file's name by looking for \"EXPORT_FILE_NAME\" property
of subtree at point.

When optional argument PUB-DIR is set, use it as the publishing
directory.

When optional argument VISIBLE-ONLY is non-nil, don't export
contents of hidden elements.

Return file name as a string, or nil if it couldn't be
determined."
  (let ((base-name
	 ;; File name may come from EXPORT_FILE_NAME subtree property,
	 ;; assuming point is at beginning of said sub-tree.
	 (file-name-sans-extension
	  (or (and subtreep
		   (org-entry-get
		    (save-excursion
		      (ignore-errors (org-back-to-heading) (point)))
		    "EXPORT_FILE_NAME" t))
	      ;; File name may be extracted from buffer's associated
	      ;; file, if any.
	      (let ((visited-file (buffer-file-name (buffer-base-buffer))))
		(and visited-file (file-name-nondirectory visited-file)))
	      ;; Can't determine file name on our own: Ask user.
	      (let ((read-file-name-function
		     (and org-completion-use-ido 'ido-read-file-name)))
		(read-file-name
		 "Output file: " pub-dir nil nil nil
		 (lambda (name)
		   (string= (file-name-extension name t) extension))))))))
    ;; Build file name.  Enforce EXTENSION over whatever user may have
    ;; come up with.  PUB-DIR, if defined, always has precedence over
    ;; any provided path.
    (cond
     (pub-dir
      (concat (file-name-as-directory pub-dir)
	      (file-name-nondirectory base-name)
	      extension))
     ((file-name-absolute-p base-name) (concat base-name extension))
     (t (concat (file-name-as-directory ".") base-name extension)))))

(defun org-export-copy-buffer ()
  "Return a copy of the current buffer.
The copy preserves Org buffer-local variables, visibility and
narrowing."
  (let ((copy-buffer-fun (org-export--generate-copy-script (current-buffer)))
	(new-buf (generate-new-buffer (buffer-name))))
    (with-current-buffer new-buf
      (funcall copy-buffer-fun)
      (set-buffer-modified-p nil))
    new-buf))

(defmacro org-export-with-buffer-copy (&rest body)
  "Apply BODY in a copy of the current buffer.
The copy preserves local variables, visibility and contents of
the original buffer.  Point is at the beginning of the buffer
when BODY is applied."
  (declare (debug t))
  (org-with-gensyms (buf-copy)
    `(let ((,buf-copy (org-export-copy-buffer)))
       (unwind-protect
	   (with-current-buffer ,buf-copy
	     (goto-char (point-min))
	     (progn ,@body))
	 (and (buffer-live-p ,buf-copy)
	      ;; Kill copy without confirmation.
	      (progn (with-current-buffer ,buf-copy
		       (restore-buffer-modified-p nil))
		     (kill-buffer ,buf-copy)))))))

(defun org-export--generate-copy-script (buffer)
  "Generate a function duplicating BUFFER.

The copy will preserve local variables, visibility, contents and
narrowing of the original buffer.  If a region was active in
BUFFER, contents will be narrowed to that region instead.

The resulting function can be eval'ed at a later time, from
another buffer, effectively cloning the original buffer there."
  (with-current-buffer buffer
    `(lambda ()
       (let ((inhibit-modification-hooks t))
	 ;; Buffer local variables.
	 ,@(let (local-vars)
	     (mapc
	      (lambda (entry)
		(when (consp entry)
		  (let ((var (car entry))
			(val (cdr entry)))
		    (and (not (eq var 'org-font-lock-keywords))
			 (or (memq var
				   '(major-mode default-directory
						buffer-file-name outline-level
						outline-regexp
						buffer-invisibility-spec))
			     (string-match "^\\(org-\\|orgtbl-\\)"
					   (symbol-name var)))
			 ;; Skip unreadable values, as they cannot be
			 ;; sent to external process.
			 (or (not val) (ignore-errors (read (format "%S" val))))
			 (push `(set (make-local-variable (quote ,var))
				     (quote ,val))
			       local-vars)))))
	      (buffer-local-variables (buffer-base-buffer)))
	     local-vars)
	 ;; Whole buffer contents.
	 (insert
	  ,(org-with-wide-buffer
	    (buffer-substring-no-properties
	     (point-min) (point-max))))
	 ;; Narrowing.
	 ,(if (org-region-active-p)
	      `(narrow-to-region ,(region-beginning) ,(region-end))
	    `(narrow-to-region ,(point-min) ,(point-max)))
	 ;; Current position of point.
	 (goto-char ,(point))
	 ;; Overlays with invisible property.
	 ,@(let (ov-set)
	     (mapc
	      (lambda (ov)
		(let ((invis-prop (overlay-get ov 'invisible)))
		  (when invis-prop
		    (push `(overlay-put
			    (make-overlay ,(overlay-start ov)
					  ,(overlay-end ov))
			    'invisible (quote ,invis-prop))
			  ov-set))))
	      (overlays-in (point-min) (point-max)))
	     ov-set)))))

(defun org-export-expand-include-keyword (&optional included dir)
  "Expand every include keyword in buffer.
Optional argument INCLUDED is a list of included file names along
with their line restriction, when appropriate.  It is used to
avoid infinite recursion.  Optional argument DIR is the current
working directory.  It is used to properly resolve relative
paths."
  (let ((case-fold-search t))
    (goto-char (point-min))
    (while (re-search-forward "^[ \t]*#\\+INCLUDE: +\\(.*\\)[ \t]*$" nil t)
      (when (eq (org-element-type (save-match-data (org-element-at-point)))
		'keyword)
	(beginning-of-line)
	;; Extract arguments from keyword's value.
	(let* ((value (match-string 1))
	       (ind (org-get-indentation))
	       (file (and (string-match "^\"\\(\\S-+\\)\"" value)
			  (prog1 (expand-file-name (match-string 1 value) dir)
			    (setq value (replace-match "" nil nil value)))))
	       (lines
		(and (string-match
		      ":lines +\"\\(\\(?:[0-9]+\\)?-\\(?:[0-9]+\\)?\\)\"" value)
		     (prog1 (match-string 1 value)
		       (setq value (replace-match "" nil nil value)))))
	       (env (cond ((string-match "\\<example\\>" value) 'example)
			  ((string-match "\\<src\\(?: +\\(.*\\)\\)?" value)
			   (match-string 1 value))))
	       ;; Minimal level of included file defaults to the child
	       ;; level of the current headline, if any, or one.  It
	       ;; only applies is the file is meant to be included as
	       ;; an Org one.
	       (minlevel
		(and (not env)
		     (if (string-match ":minlevel +\\([0-9]+\\)" value)
			 (prog1 (string-to-number (match-string 1 value))
			   (setq value (replace-match "" nil nil value)))
		       (let ((cur (org-current-level)))
			 (if cur (1+ (org-reduced-level cur)) 1))))))
	  ;; Remove keyword.
	  (delete-region (point) (progn (forward-line) (point)))
	  (cond
	   ((not file) (error "Invalid syntax in INCLUDE keyword"))
	   ((not (file-readable-p file)) (error "Cannot include file %s" file))
	   ;; Check if files has already been parsed.  Look after
	   ;; inclusion lines too, as different parts of the same file
	   ;; can be included too.
	   ((member (list file lines) included)
	    (error "Recursive file inclusion: %s" file))
	   (t
	    (cond
	     ((eq env 'example)
	      (insert
	       (let ((ind-str (make-string ind ? ))
		     (contents
		      (org-escape-code-in-string
		       (org-export--prepare-file-contents file lines))))
		 (format "%s#+BEGIN_EXAMPLE\n%s%s#+END_EXAMPLE\n"
			 ind-str contents ind-str))))
	     ((stringp env)
	      (insert
	       (let ((ind-str (make-string ind ? ))
		     (contents
		      (org-escape-code-in-string
		       (org-export--prepare-file-contents file lines))))
		 (format "%s#+BEGIN_SRC %s\n%s%s#+END_SRC\n"
			 ind-str env contents ind-str))))
	     (t
	      (insert
	       (with-temp-buffer
		 (org-mode)
		 (insert
		  (org-export--prepare-file-contents file lines ind minlevel))
		 (org-export-expand-include-keyword
		  (cons (list file lines) included)
		  (file-name-directory file))
		 (buffer-string))))))))))))

(defun org-export--prepare-file-contents (file &optional lines ind minlevel)
  "Prepare the contents of FILE for inclusion and return them as a string.

When optional argument LINES is a string specifying a range of
lines, include only those lines.

Optional argument IND, when non-nil, is an integer specifying the
global indentation of returned contents.  Since its purpose is to
allow an included file to stay in the same environment it was
created \(i.e. a list item), it doesn't apply past the first
headline encountered.

Optional argument MINLEVEL, when non-nil, is an integer
specifying the level that any top-level headline in the included
file should have."
  (with-temp-buffer
    (insert-file-contents file)
    (when lines
      (let* ((lines (split-string lines "-"))
	     (lbeg (string-to-number (car lines)))
	     (lend (string-to-number (cadr lines)))
	     (beg (if (zerop lbeg) (point-min)
		    (goto-char (point-min))
		    (forward-line (1- lbeg))
		    (point)))
	     (end (if (zerop lend) (point-max)
		    (goto-char (point-min))
		    (forward-line (1- lend))
		    (point))))
	(narrow-to-region beg end)))
    ;; Remove blank lines at beginning and end of contents.  The logic
    ;; behind that removal is that blank lines around include keyword
    ;; override blank lines in included file.
    (goto-char (point-min))
    (org-skip-whitespace)
    (beginning-of-line)
    (delete-region (point-min) (point))
    (goto-char (point-max))
    (skip-chars-backward " \r\t\n")
    (forward-line)
    (delete-region (point) (point-max))
    ;; If IND is set, preserve indentation of include keyword until
    ;; the first headline encountered.
    (when ind
      (unless (eq major-mode 'org-mode) (org-mode))
      (goto-char (point-min))
      (let ((ind-str (make-string ind ? )))
	(while (not (or (eobp) (looking-at org-outline-regexp-bol)))
	  ;; Do not move footnote definitions out of column 0.
	  (unless (and (looking-at org-footnote-definition-re)
		       (eq (org-element-type (org-element-at-point))
			   'footnote-definition))
	    (insert ind-str))
	  (forward-line))))
    ;; When MINLEVEL is specified, compute minimal level for headlines
    ;; in the file (CUR-MIN), and remove stars to each headline so
    ;; that headlines with minimal level have a level of MINLEVEL.
    (when minlevel
      (unless (eq major-mode 'org-mode) (org-mode))
      (org-with-limited-levels
       (let ((levels (org-map-entries
		      (lambda () (org-reduced-level (org-current-level))))))
	 (when levels
	   (let ((offset (- minlevel (apply 'min levels))))
	     (unless (zerop offset)
	       (when org-odd-levels-only (setq offset (* offset 2)))
	       ;; Only change stars, don't bother moving whole
	       ;; sections.
	       (org-map-entries
		(lambda () (if (< offset 0) (delete-char (abs offset))
			(insert (make-string offset ?*)))))))))))
    (org-element-normalize-string (buffer-string))))

(defun org-export-execute-babel-code ()
  "Execute every Babel code in the visible part of current buffer."
  ;; Get a pristine copy of current buffer so Babel references can be
  ;; properly resolved.
  (let ((reference (org-export-copy-buffer)))
    (unwind-protect (let ((org-current-export-file reference))
		      (org-export-blocks-preprocess))
      (kill-buffer reference))))



;;; Tools For Back-Ends
;;
;; A whole set of tools is available to help build new exporters.  Any
;; function general enough to have its use across many back-ends
;; should be added here.

;;;; For Affiliated Keywords
;;
;; `org-export-read-attribute' reads a property from a given element
;;  as a plist.  It can be used to normalize affiliated keywords'
;;  syntax.
;;
;; Since captions can span over multiple lines and accept dual values,
;; their internal representation is a bit tricky.  Therefore,
;; `org-export-get-caption' transparently returns a given element's
;; caption as a secondary string.

(defun org-export-read-attribute (attribute element &optional property)
  "Turn ATTRIBUTE property from ELEMENT into a plist.

When optional argument PROPERTY is non-nil, return the value of
that property within attributes.

This function assumes attributes are defined as \":keyword
value\" pairs.  It is appropriate for `:attr_html' like
properties."
  (let ((attributes
	 (let ((value (org-element-property attribute element)))
	   (and value
		(read (format "(%s)" (mapconcat 'identity value " ")))))))
    (if property (plist-get attributes property) attributes)))

(defun org-export-get-caption (element &optional shortp)
  "Return caption from ELEMENT as a secondary string.

When optional argument SHORTP is non-nil, return short caption,
as a secondary string, instead.

Caption lines are separated by a white space."
  (let ((full-caption (org-element-property :caption element)) caption)
    (dolist (line full-caption (cdr caption))
      (let ((cap (funcall (if shortp 'cdr 'car) line)))
	(when cap
	  (setq caption (nconc (list " ") (copy-sequence cap) caption)))))))


;;;; For Derived Back-ends
;;
;; `org-export-with-backend' is a function allowing to locally use
;; another back-end to transcode some object or element.  In a derived
;; back-end, it may be used as a fall-back function once all specific
;; cases have been treated.

(defun org-export-with-backend (back-end data &optional contents info)
  "Call a transcoder from BACK-END on DATA.
CONTENTS, when non-nil, is the transcoded contents of DATA
element, as a string.  INFO, when non-nil, is the communication
channel used for export, as a plist.."
  (org-export-barf-if-invalid-backend back-end)
  (let ((type (org-element-type data)))
    (if (memq type '(nil org-data)) (error "No foreign transcoder available")
      (let ((transcoder
	     (cdr (assq type (org-export-backend-translate-table back-end)))))
	(if (functionp transcoder) (funcall transcoder data contents info)
	  (error "No foreign transcoder available"))))))


;;;; For Export Snippets
;;
;; Every export snippet is transmitted to the back-end.  Though, the
;; latter will only retain one type of export-snippet, ignoring
;; others, based on the former's target back-end.  The function
;; `org-export-snippet-backend' returns that back-end for a given
;; export-snippet.

(defun org-export-snippet-backend (export-snippet)
  "Return EXPORT-SNIPPET targeted back-end as a symbol.
Translation, with `org-export-snippet-translation-alist', is
applied."
  (let ((back-end (org-element-property :back-end export-snippet)))
    (intern
     (or (cdr (assoc back-end org-export-snippet-translation-alist))
	 back-end))))


;;;; For Footnotes
;;
;; `org-export-collect-footnote-definitions' is a tool to list
;; actually used footnotes definitions in the whole parse tree, or in
;; an headline, in order to add footnote listings throughout the
;; transcoded data.
;;
;; `org-export-footnote-first-reference-p' is a predicate used by some
;; back-ends, when they need to attach the footnote definition only to
;; the first occurrence of the corresponding label.
;;
;; `org-export-get-footnote-definition' and
;; `org-export-get-footnote-number' provide easier access to
;; additional information relative to a footnote reference.

(defun org-export-collect-footnote-definitions (data info)
  "Return an alist between footnote numbers, labels and definitions.

DATA is the parse tree from which definitions are collected.
INFO is the plist used as a communication channel.

Definitions are sorted by order of references.  They either
appear as Org data or as a secondary string for inlined
footnotes.  Unreferenced definitions are ignored."
  (let* (num-alist
	 collect-fn			; for byte-compiler.
	 (collect-fn
	  (function
	   (lambda (data)
	     ;; Collect footnote number, label and definition in DATA.
	     (org-element-map data 'footnote-reference
	       (lambda (fn)
		 (when (org-export-footnote-first-reference-p fn info)
		   (let ((def (org-export-get-footnote-definition fn info)))
		     (push
		      (list (org-export-get-footnote-number fn info)
			    (org-element-property :label fn)
			    def)
		      num-alist)
		     ;; Also search in definition for nested footnotes.
		     (when (eq (org-element-property :type fn) 'standard)
		       (funcall collect-fn def)))))
	       ;; Don't enter footnote definitions since it will happen
	       ;; when their first reference is found.
	       info nil 'footnote-definition)))))
    (funcall collect-fn (plist-get info :parse-tree))
    (reverse num-alist)))

(defun org-export-footnote-first-reference-p (footnote-reference info)
  "Non-nil when a footnote reference is the first one for its label.

FOOTNOTE-REFERENCE is the footnote reference being considered.
INFO is the plist used as a communication channel."
  (let ((label (org-element-property :label footnote-reference)))
    ;; Anonymous footnotes are always a first reference.
    (if (not label) t
      ;; Otherwise, return the first footnote with the same LABEL and
      ;; test if it is equal to FOOTNOTE-REFERENCE.
      (let* (search-refs		; for byte-compiler.
	     (search-refs
	      (function
	       (lambda (data)
		 (org-element-map data 'footnote-reference
		   (lambda (fn)
		     (cond
		      ((string= (org-element-property :label fn) label)
		       (throw 'exit fn))
		      ;; If FN isn't inlined, be sure to traverse its
		      ;; definition before resuming search.  See
		      ;; comments in `org-export-get-footnote-number'
		      ;; for more information.
		      ((eq (org-element-property :type fn) 'standard)
		       (funcall search-refs
				(org-export-get-footnote-definition fn info)))))
		   ;; Don't enter footnote definitions since it will
		   ;; happen when their first reference is found.
		   info 'first-match 'footnote-definition)))))
	(eq (catch 'exit (funcall search-refs (plist-get info :parse-tree)))
	    footnote-reference)))))

(defun org-export-get-footnote-definition (footnote-reference info)
  "Return definition of FOOTNOTE-REFERENCE as parsed data.
INFO is the plist used as a communication channel.  If no such
definition can be found, return the \"DEFINITION NOT FOUND\"
string."
  (let ((label (org-element-property :label footnote-reference)))
    (or (org-element-property :inline-definition footnote-reference)
        (cdr (assoc label (plist-get info :footnote-definition-alist)))
	"DEFINITION NOT FOUND.")))

(defun org-export-get-footnote-number (footnote info)
  "Return number associated to a footnote.

FOOTNOTE is either a footnote reference or a footnote definition.
INFO is the plist used as a communication channel."
  (let* ((label (org-element-property :label footnote))
	 seen-refs
	 search-ref			; For byte-compiler.
	 (search-ref
	  (function
	   (lambda (data)
	     ;; Search footnote references through DATA, filling
	     ;; SEEN-REFS along the way.
	     (org-element-map data 'footnote-reference
	       (lambda (fn)
		 (let ((fn-lbl (org-element-property :label fn)))
		   (cond
		    ;; Anonymous footnote match: return number.
		    ((and (not fn-lbl) (eq fn footnote))
		     (throw 'exit (1+ (length seen-refs))))
		    ;; Labels match: return number.
		    ((and label (string= label fn-lbl))
		     (throw 'exit (1+ (length seen-refs))))
		    ;; Anonymous footnote: it's always a new one.
		    ;; Also, be sure to return nil from the `cond' so
		    ;; `first-match' doesn't get us out of the loop.
		    ((not fn-lbl) (push 'inline seen-refs) nil)
		    ;; Label not seen so far: add it so SEEN-REFS.
		    ;;
		    ;; Also search for subsequent references in
		    ;; footnote definition so numbering follows
		    ;; reading logic.  Note that we don't have to care
		    ;; about inline definitions, since
		    ;; `org-element-map' already traverses them at the
		    ;; right time.
		    ;;
		    ;; Once again, return nil to stay in the loop.
		    ((not (member fn-lbl seen-refs))
		     (push fn-lbl seen-refs)
		     (funcall search-ref
			      (org-export-get-footnote-definition fn info))
		     nil))))
	       ;; Don't enter footnote definitions since it will
	       ;; happen when their first reference is found.
	       info 'first-match 'footnote-definition)))))
    (catch 'exit (funcall search-ref (plist-get info :parse-tree)))))


;;;; For Headlines
;;
;; `org-export-get-relative-level' is a shortcut to get headline
;; level, relatively to the lower headline level in the parsed tree.
;;
;; `org-export-get-headline-number' returns the section number of an
;; headline, while `org-export-number-to-roman' allows to convert it
;; to roman numbers.
;;
;; `org-export-low-level-p', `org-export-first-sibling-p' and
;; `org-export-last-sibling-p' are three useful predicates when it
;; comes to fulfill the `:headline-levels' property.
;;
;; `org-export-get-tags', `org-export-get-category' and
;; `org-export-get-node-property' extract useful information from an
;; headline or a parent headline.  They all handle inheritance.

(defun org-export-get-relative-level (headline info)
  "Return HEADLINE relative level within current parsed tree.
INFO is a plist holding contextual information."
  (+ (org-element-property :level headline)
     (or (plist-get info :headline-offset) 0)))

(defun org-export-low-level-p (headline info)
  "Non-nil when HEADLINE is considered as low level.

INFO is a plist used as a communication channel.

A low level headlines has a relative level greater than
`:headline-levels' property value.

Return value is the difference between HEADLINE relative level
and the last level being considered as high enough, or nil."
  (let ((limit (plist-get info :headline-levels)))
    (when (wholenump limit)
      (let ((level (org-export-get-relative-level headline info)))
        (and (> level limit) (- level limit))))))

(defun org-export-get-headline-number (headline info)
  "Return HEADLINE numbering as a list of numbers.
INFO is a plist holding contextual information."
  (cdr (assoc headline (plist-get info :headline-numbering))))

(defun org-export-numbered-headline-p (headline info)
  "Return a non-nil value if HEADLINE element should be numbered.
INFO is a plist used as a communication channel."
  (let ((sec-num (plist-get info :section-numbers))
	(level (org-export-get-relative-level headline info)))
    (if (wholenump sec-num) (<= level sec-num) sec-num)))

(defun org-export-number-to-roman (n)
  "Convert integer N into a roman numeral."
  (let ((roman '((1000 . "M") (900 . "CM") (500 . "D") (400 . "CD")
		 ( 100 . "C") ( 90 . "XC") ( 50 . "L") ( 40 . "XL")
		 (  10 . "X") (  9 . "IX") (  5 . "V") (  4 . "IV")
		 (   1 . "I")))
	(res ""))
    (if (<= n 0)
	(number-to-string n)
      (while roman
	(if (>= n (caar roman))
	    (setq n (- n (caar roman))
		  res (concat res (cdar roman)))
	  (pop roman)))
      res)))

(defun org-export-get-tags (element info &optional tags inherited)
  "Return list of tags associated to ELEMENT.

ELEMENT has either an `headline' or an `inlinetask' type.  INFO
is a plist used as a communication channel.

Select tags (see `org-export-select-tags') and exclude tags (see
`org-export-exclude-tags') are removed from the list.

When non-nil, optional argument TAGS should be a list of strings.
Any tag belonging to this list will also be removed.

When optional argument INHERITED is non-nil, tags can also be
inherited from parent headlines and FILETAGS keywords."
  (org-remove-if
   (lambda (tag) (or (member tag (plist-get info :select-tags))
		(member tag (plist-get info :exclude-tags))
		(member tag tags)))
   (if (not inherited) (org-element-property :tags element)
     ;; Build complete list of inherited tags.
     (let ((current-tag-list (org-element-property :tags element)))
       (mapc
	(lambda (parent)
	  (mapc
	   (lambda (tag)
	     (when (and (memq (org-element-type parent) '(headline inlinetask))
			(not (member tag current-tag-list)))
	       (push tag current-tag-list)))
	   (org-element-property :tags parent)))
	(org-export-get-genealogy element))
       ;; Add FILETAGS keywords and return results.
       (org-uniquify (append (plist-get info :filetags) current-tag-list))))))

(defun org-export-get-node-property (property blob &optional inherited)
  "Return node PROPERTY value for BLOB.

PROPERTY is normalized symbol (i.e. `:cookie-data').  BLOB is an
element or object.

If optional argument INHERITED is non-nil, the value can be
inherited from a parent headline.

Return value is a string or nil."
  (let ((headline (if (eq (org-element-type blob) 'headline) blob
		    (org-export-get-parent-headline blob))))
    (if (not inherited) (org-element-property property blob)
      (let ((parent headline) value)
	(catch 'found
	  (while parent
	    (when (plist-member (nth 1 parent) property)
	      (throw 'found (org-element-property property parent)))
	    (setq parent (org-element-property :parent parent))))))))

(defun org-export-get-category (blob info)
  "Return category for element or object BLOB.

INFO is a plist used as a communication channel.

CATEGORY is automatically inherited from a parent headline, from
#+CATEGORY: keyword or created out of original file name.  If all
fail, the fall-back value is \"???\"."
  (or (let ((headline (if (eq (org-element-type blob) 'headline) blob
			(org-export-get-parent-headline blob))))
	;; Almost like `org-export-node-property', but we cannot trust
	;; `plist-member' as every headline has a `:category'
	;; property, would it be nil or equal to "???" (which has the
	;; same meaning).
	(let ((parent headline) value)
	  (catch 'found
	    (while parent
	      (let ((category (org-element-property :category parent)))
		(and category (not (equal "???" category))
		     (throw 'found category)))
	      (setq parent (org-element-property :parent parent))))))
      (org-element-map (plist-get info :parse-tree) 'keyword
	(lambda (kwd)
	  (when (equal (org-element-property :key kwd) "CATEGORY")
	    (org-element-property :value kwd)))
	info 'first-match)
      (let ((file (plist-get info :input-file)))
	(and file (file-name-sans-extension (file-name-nondirectory file))))
      "???"))

(defun org-export-first-sibling-p (headline info)
  "Non-nil when HEADLINE is the first sibling in its sub-tree.
INFO is a plist used as a communication channel."
  (not (eq (org-element-type (org-export-get-previous-element headline info))
	   'headline)))

(defun org-export-last-sibling-p (headline info)
  "Non-nil when HEADLINE is the last sibling in its sub-tree.
INFO is a plist used as a communication channel."
  (not (org-export-get-next-element headline info)))


;;;; For Links
;;
;; `org-export-solidify-link-text' turns a string into a safer version
;; for links, replacing most non-standard characters with hyphens.
;;
;; `org-export-get-coderef-format' returns an appropriate format
;; string for coderefs.
;;
;; `org-export-inline-image-p' returns a non-nil value when the link
;; provided should be considered as an inline image.
;;
;; `org-export-resolve-fuzzy-link' searches destination of fuzzy links
;; (i.e. links with "fuzzy" as type) within the parsed tree, and
;; returns an appropriate unique identifier when found, or nil.
;;
;; `org-export-resolve-id-link' returns the first headline with
;; specified id or custom-id in parse tree, the path to the external
;; file with the id or nil when neither was found.
;;
;; `org-export-resolve-coderef' associates a reference to a line
;; number in the element it belongs, or returns the reference itself
;; when the element isn't numbered.

(defun org-export-solidify-link-text (s)
  "Take link text S and make a safe target out of it."
  (save-match-data
    (mapconcat 'identity (org-split-string s "[^a-zA-Z0-9_.-:]+") "-")))

(defun org-export-get-coderef-format (path desc)
  "Return format string for code reference link.
PATH is the link path.  DESC is its description."
  (save-match-data
    (cond ((not desc) "%s")
	  ((string-match (regexp-quote (concat "(" path ")")) desc)
	   (replace-match "%s" t t desc))
	  (t desc))))

(defun org-export-inline-image-p (link &optional rules)
  "Non-nil if LINK object points to an inline image.

Optional argument is a set of RULES defining inline images.  It
is an alist where associations have the following shape:

  \(TYPE . REGEXP)

Applying a rule means apply REGEXP against LINK's path when its
type is TYPE.  The function will return a non-nil value if any of
the provided rules is non-nil.  The default rule is
`org-export-default-inline-image-rule'.

This only applies to links without a description."
  (and (not (org-element-contents link))
       (let ((case-fold-search t)
	     (rules (or rules org-export-default-inline-image-rule)))
	 (catch 'exit
	   (mapc
	    (lambda (rule)
	      (and (string= (org-element-property :type link) (car rule))
		   (string-match (cdr rule)
				 (org-element-property :path link))
		   (throw 'exit t)))
	    rules)
	   ;; Return nil if no rule matched.
	   nil))))

(defun org-export-resolve-coderef (ref info)
  "Resolve a code reference REF.

INFO is a plist used as a communication channel.

Return associated line number in source code, or REF itself,
depending on src-block or example element's switches."
  (org-element-map (plist-get info :parse-tree) '(example-block src-block)
    (lambda (el)
      (with-temp-buffer
	(insert (org-trim (org-element-property :value el)))
	(let* ((label-fmt (regexp-quote
			   (or (org-element-property :label-fmt el)
			       org-coderef-label-format)))
	       (ref-re
		(format "^.*?\\S-.*?\\([ \t]*\\(%s\\)\\)[ \t]*$"
			(replace-regexp-in-string "%s" ref label-fmt nil t))))
	  ;; Element containing REF is found.  Resolve it to either
	  ;; a label or a line number, as needed.
	  (when (re-search-backward ref-re nil t)
	    (cond
	     ((org-element-property :use-labels el) ref)
	     ((eq (org-element-property :number-lines el) 'continued)
	      (+ (org-export-get-loc el info) (line-number-at-pos)))
	     (t (line-number-at-pos)))))))
    info 'first-match))

(defun org-export-resolve-fuzzy-link (link info)
  "Return LINK destination.

INFO is a plist holding contextual information.

Return value can be an object, an element, or nil:

- If LINK path matches a target object (i.e. <<path>>) or
  element (i.e. \"#+TARGET: path\"), return it.

- If LINK path exactly matches the name affiliated keyword
  \(i.e. #+NAME: path) of an element, return that element.

- If LINK path exactly matches any headline name, return that
  element.  If more than one headline share that name, priority
  will be given to the one with the closest common ancestor, if
  any, or the first one in the parse tree otherwise.

- Otherwise, return nil.

Assume LINK type is \"fuzzy\"."
  (let* ((path (org-element-property :path link))
	 (match-title-p (eq (aref path 0) ?*)))
    (cond
     ;; First try to find a matching "<<path>>" unless user specified
     ;; he was looking for an headline (path starts with a *
     ;; character).
     ((and (not match-title-p)
	   (org-element-map (plist-get info :parse-tree) '(keyword target)
	     (lambda (blob)
	       (and (or (eq (org-element-type blob) 'target)
			(equal (org-element-property :key blob) "TARGET"))
		    (equal (org-element-property :value blob) path)
		    blob))
	     info t)))
     ;; Then try to find an element with a matching "#+NAME: path"
     ;; affiliated keyword.
     ((and (not match-title-p)
	   (org-element-map (plist-get info :parse-tree)
	       org-element-all-elements
	     (lambda (el)
	       (when (string= (org-element-property :name el) path) el))
	     info 'first-match)))
     ;; Last case: link either points to an headline or to
     ;; nothingness.  Try to find the source, with priority given to
     ;; headlines with the closest common ancestor.  If such candidate
     ;; is found, return it, otherwise return nil.
     (t
      (let ((find-headline
	     (function
	      ;; Return first headline whose `:raw-value' property is
	      ;; NAME in parse tree DATA, or nil.
	      (lambda (name data)
		(org-element-map data 'headline
		  (lambda (headline)
		    (when (string=
			   (org-element-property :raw-value headline)
			   name)
		      headline))
		  info 'first-match)))))
	;; Search among headlines sharing an ancestor with link, from
	;; closest to farthest.
	(or (catch 'exit
	      (mapc
	       (lambda (parent)
		 (when (eq (org-element-type parent) 'headline)
		   (let ((foundp (funcall find-headline path parent)))
		     (when foundp (throw 'exit foundp)))))
	       (org-export-get-genealogy link)) nil)
	    ;; No match with a common ancestor: try full parse-tree.
	    (funcall find-headline
		     (if match-title-p (substring path 1) path)
		     (plist-get info :parse-tree))))))))

(defun org-export-resolve-id-link (link info)
  "Return headline referenced as LINK destination.

INFO is a plist used as a communication channel.

Return value can be the headline element matched in current parse
tree, a file name or nil.  Assume LINK type is either \"id\" or
\"custom-id\"."
  (let ((id (org-element-property :path link)))
    ;; First check if id is within the current parse tree.
    (or (org-element-map (plist-get info :parse-tree) 'headline
	  (lambda (headline)
	    (when (or (string= (org-element-property :id headline) id)
		      (string= (org-element-property :custom-id headline) id))
	      headline))
	  info 'first-match)
	;; Otherwise, look for external files.
	(cdr (assoc id (plist-get info :id-alist))))))

(defun org-export-resolve-radio-link (link info)
  "Return radio-target object referenced as LINK destination.

INFO is a plist used as a communication channel.

Return value can be a radio-target object or nil.  Assume LINK
has type \"radio\"."
  (let ((path (org-element-property :path link)))
    (org-element-map (plist-get info :parse-tree) 'radio-target
      (lambda (radio)
	(when (equal (org-element-property :value radio) path) radio))
      info 'first-match)))


;;;; For References
;;
;; `org-export-get-ordinal' associates a sequence number to any object
;; or element.

(defun org-export-get-ordinal (element info &optional types predicate)
  "Return ordinal number of an element or object.

ELEMENT is the element or object considered.  INFO is the plist
used as a communication channel.

Optional argument TYPES, when non-nil, is a list of element or
object types, as symbols, that should also be counted in.
Otherwise, only provided element's type is considered.

Optional argument PREDICATE is a function returning a non-nil
value if the current element or object should be counted in.  It
accepts two arguments: the element or object being considered and
the plist used as a communication channel.  This allows to count
only a certain type of objects (i.e. inline images).

Return value is a list of numbers if ELEMENT is an headline or an
item.  It is nil for keywords.  It represents the footnote number
for footnote definitions and footnote references.  If ELEMENT is
a target, return the same value as if ELEMENT was the closest
table, item or headline containing the target.  In any other
case, return the sequence number of ELEMENT among elements or
objects of the same type."
  ;; A target keyword, representing an invisible target, never has
  ;; a sequence number.
  (unless (eq (org-element-type element) 'keyword)
    ;; Ordinal of a target object refer to the ordinal of the closest
    ;; table, item, or headline containing the object.
    (when (eq (org-element-type element) 'target)
      (setq element
	    (loop for parent in (org-export-get-genealogy element)
		  when
		  (memq
		   (org-element-type parent)
		   '(footnote-definition footnote-reference headline item
                                         table))
		  return parent)))
    (case (org-element-type element)
      ;; Special case 1: An headline returns its number as a list.
      (headline (org-export-get-headline-number element info))
      ;; Special case 2: An item returns its number as a list.
      (item (let ((struct (org-element-property :structure element)))
	      (org-list-get-item-number
	       (org-element-property :begin element)
	       struct
	       (org-list-prevs-alist struct)
	       (org-list-parents-alist struct))))
      ((footnote-definition footnote-reference)
       (org-export-get-footnote-number element info))
      (otherwise
       (let ((counter 0))
	 ;; Increment counter until ELEMENT is found again.
	 (org-element-map (plist-get info :parse-tree)
	     (or types (org-element-type element))
	   (lambda (el)
	     (cond
	      ((eq element el) (1+ counter))
	      ((not predicate) (incf counter) nil)
	      ((funcall predicate el info) (incf counter) nil)))
	   info 'first-match))))))


;;;; For Src-Blocks
;;
;; `org-export-get-loc' counts number of code lines accumulated in
;; src-block or example-block elements with a "+n" switch until
;; a given element, excluded.  Note: "-n" switches reset that count.
;;
;; `org-export-unravel-code' extracts source code (along with a code
;; references alist) from an `element-block' or `src-block' type
;; element.
;;
;; `org-export-format-code' applies a formatting function to each line
;; of code, providing relative line number and code reference when
;; appropriate.  Since it doesn't access the original element from
;; which the source code is coming, it expects from the code calling
;; it to know if lines should be numbered and if code references
;; should appear.
;;
;; Eventually, `org-export-format-code-default' is a higher-level
;; function (it makes use of the two previous functions) which handles
;; line numbering and code references inclusion, and returns source
;; code in a format suitable for plain text or verbatim output.

(defun org-export-get-loc (element info)
  "Return accumulated lines of code up to ELEMENT.

INFO is the plist used as a communication channel.

ELEMENT is excluded from count."
  (let ((loc 0))
    (org-element-map (plist-get info :parse-tree)
	`(src-block example-block ,(org-element-type element))
      (lambda (el)
	(cond
	 ;; ELEMENT is reached: Quit the loop.
	 ((eq el element))
	 ;; Only count lines from src-block and example-block elements
	 ;; with a "+n" or "-n" switch.  A "-n" switch resets counter.
	 ((not (memq (org-element-type el) '(src-block example-block))) nil)
	 ((let ((linums (org-element-property :number-lines el)))
	    (when linums
	      ;; Accumulate locs or reset them.
	      (let ((lines (org-count-lines
			    (org-trim (org-element-property :value el)))))
		(setq loc (if (eq linums 'new) lines (+ loc lines))))))
	  ;; Return nil to stay in the loop.
	  nil)))
      info 'first-match)
    ;; Return value.
    loc))

(defun org-export-unravel-code (element)
  "Clean source code and extract references out of it.

ELEMENT has either a `src-block' an `example-block' type.

Return a cons cell whose CAR is the source code, cleaned from any
reference and protective comma and CDR is an alist between
relative line number (integer) and name of code reference on that
line (string)."
  (let* ((line 0) refs
	 ;; Get code and clean it.  Remove blank lines at its
	 ;; beginning and end.
	 (code (let ((c (replace-regexp-in-string
			 "\\`\\([ \t]*\n\\)+" ""
			 (replace-regexp-in-string
			  "\\([ \t]*\n\\)*[ \t]*\\'" "\n"
			  (org-element-property :value element)))))
		 ;; If appropriate, remove global indentation.
		 (if (or org-src-preserve-indentation
			 (org-element-property :preserve-indent element))
		     c
		   (org-remove-indentation c))))
	 ;; Get format used for references.
	 (label-fmt (regexp-quote
		     (or (org-element-property :label-fmt element)
			 org-coderef-label-format)))
	 ;; Build a regexp matching a loc with a reference.
	 (with-ref-re
	  (format "^.*?\\S-.*?\\([ \t]*\\(%s\\)[ \t]*\\)$"
		  (replace-regexp-in-string
		   "%s" "\\([-a-zA-Z0-9_ ]+\\)" label-fmt nil t))))
    ;; Return value.
    (cons
     ;; Code with references removed.
     (org-element-normalize-string
      (mapconcat
       (lambda (loc)
	 (incf line)
	 (if (not (string-match with-ref-re loc)) loc
	   ;; Ref line: remove ref, and signal its position in REFS.
	   (push (cons line (match-string 3 loc)) refs)
	   (replace-match "" nil nil loc 1)))
       (org-split-string code "\n") "\n"))
     ;; Reference alist.
     refs)))

(defun org-export-format-code (code fun &optional num-lines ref-alist)
  "Format CODE by applying FUN line-wise and return it.

CODE is a string representing the code to format.  FUN is
a function.  It must accept three arguments: a line of
code (string), the current line number (integer) or nil and the
reference associated to the current line (string) or nil.

Optional argument NUM-LINES can be an integer representing the
number of code lines accumulated until the current code.  Line
numbers passed to FUN will take it into account.  If it is nil,
FUN's second argument will always be nil.  This number can be
obtained with `org-export-get-loc' function.

Optional argument REF-ALIST can be an alist between relative line
number (i.e. ignoring NUM-LINES) and the name of the code
reference on it.  If it is nil, FUN's third argument will always
be nil.  It can be obtained through the use of
`org-export-unravel-code' function."
  (let ((--locs (org-split-string code "\n"))
	(--line 0))
    (org-element-normalize-string
     (mapconcat
      (lambda (--loc)
	(incf --line)
	(let ((--ref (cdr (assq --line ref-alist))))
	  (funcall fun --loc (and num-lines (+ num-lines --line)) --ref)))
      --locs "\n"))))

(defun org-export-format-code-default (element info)
  "Return source code from ELEMENT, formatted in a standard way.

ELEMENT is either a `src-block' or `example-block' element.  INFO
is a plist used as a communication channel.

This function takes care of line numbering and code references
inclusion.  Line numbers, when applicable, appear at the
beginning of the line, separated from the code by two white
spaces.  Code references, on the other hand, appear flushed to
the right, separated by six white spaces from the widest line of
code."
  ;; Extract code and references.
  (let* ((code-info (org-export-unravel-code element))
         (code (car code-info))
         (code-lines (org-split-string code "\n"))
	 (refs (and (org-element-property :retain-labels element)
		    (cdr code-info)))
         ;; Handle line numbering.
         (num-start (case (org-element-property :number-lines element)
                      (continued (org-export-get-loc element info))
                      (new 0)))
         (num-fmt
          (and num-start
               (format "%%%ds  "
                       (length (number-to-string
                                (+ (length code-lines) num-start))))))
         ;; Prepare references display, if required.  Any reference
         ;; should start six columns after the widest line of code,
         ;; wrapped with parenthesis.
	 (max-width
	  (+ (apply 'max (mapcar 'length code-lines))
	     (if (not num-start) 0 (length (format num-fmt num-start))))))
    (org-export-format-code
     code
     (lambda (loc line-num ref)
       (let ((number-str (and num-fmt (format num-fmt line-num))))
         (concat
          number-str
          loc
          (and ref
               (concat (make-string
                        (- (+ 6 max-width)
                           (+ (length loc) (length number-str))) ? )
                       (format "(%s)" ref))))))
     num-start refs)))


;;;; For Tables
;;
;; `org-export-table-has-special-column-p' and and
;; `org-export-table-row-is-special-p' are predicates used to look for
;; meta-information about the table structure.
;;
;; `org-table-has-header-p' tells when the rows before the first rule
;;  should be considered as table's header.
;;
;; `org-export-table-cell-width', `org-export-table-cell-alignment'
;; and `org-export-table-cell-borders' extract information from
;; a table-cell element.
;;
;; `org-export-table-dimensions' gives the number on rows and columns
;; in the table, ignoring horizontal rules and special columns.
;; `org-export-table-cell-address', given a table-cell object, returns
;; the absolute address of a cell. On the other hand,
;; `org-export-get-table-cell-at' does the contrary.
;;
;; `org-export-table-cell-starts-colgroup-p',
;; `org-export-table-cell-ends-colgroup-p',
;; `org-export-table-row-starts-rowgroup-p',
;; `org-export-table-row-ends-rowgroup-p',
;; `org-export-table-row-starts-header-p' and
;; `org-export-table-row-ends-header-p' indicate position of current
;; row or cell within the table.

(defun org-export-table-has-special-column-p (table)
  "Non-nil when TABLE has a special column.
All special columns will be ignored during export."
  ;; The table has a special column when every first cell of every row
  ;; has an empty value or contains a symbol among "/", "#", "!", "$",
  ;; "*" "_" and "^".  Though, do not consider a first row containing
  ;; only empty cells as special.
  (let ((special-column-p 'empty))
    (catch 'exit
      (mapc
       (lambda (row)
	 (when (eq (org-element-property :type row) 'standard)
	   (let ((value (org-element-contents
			 (car (org-element-contents row)))))
	     (cond ((member value '(("/") ("#") ("!") ("$") ("*") ("_") ("^")))
		    (setq special-column-p 'special))
		   ((not value))
		   (t (throw 'exit nil))))))
       (org-element-contents table))
      (eq special-column-p 'special))))

(defun org-export-table-has-header-p (table info)
  "Non-nil when TABLE has an header.

INFO is a plist used as a communication channel.

A table has an header when it contains at least two row groups."
  (let ((rowgroup 1) row-flag)
    (org-element-map table 'table-row
      (lambda (row)
	(cond
	 ((> rowgroup 1) t)
	 ((and row-flag (eq (org-element-property :type row) 'rule))
	  (incf rowgroup) (setq row-flag nil))
	 ((and (not row-flag) (eq (org-element-property :type row) 'standard))
	  (setq row-flag t) nil)))
      info)))

(defun org-export-table-row-is-special-p (table-row info)
  "Non-nil if TABLE-ROW is considered special.

INFO is a plist used as the communication channel.

All special rows will be ignored during export."
  (when (eq (org-element-property :type table-row) 'standard)
    (let ((first-cell (org-element-contents
		       (car (org-element-contents table-row)))))
      ;; A row is special either when...
      (or
       ;; ... it starts with a field only containing "/",
       (equal first-cell '("/"))
       ;; ... the table contains a special column and the row start
       ;; with a marking character among, "^", "_", "$" or "!",
       (and (org-export-table-has-special-column-p
	     (org-export-get-parent table-row))
	    (member first-cell '(("^") ("_") ("$") ("!"))))
       ;; ... it contains only alignment cookies and empty cells.
       (let ((special-row-p 'empty))
	 (catch 'exit
	   (mapc
	    (lambda (cell)
	      (let ((value (org-element-contents cell)))
		;; Since VALUE is a secondary string, the following
		;; checks avoid expanding it with `org-export-data'.
		(cond ((not value))
		      ((and (not (cdr value))
			    (stringp (car value))
			    (string-match "\\`<[lrc]?\\([0-9]+\\)?>\\'"
					  (car value)))
		       (setq special-row-p 'cookie))
		      (t (throw 'exit nil)))))
	    (org-element-contents table-row))
	   (eq special-row-p 'cookie)))))))

(defun org-export-table-row-group (table-row info)
  "Return TABLE-ROW's group.

INFO is a plist used as the communication channel.

Return value is the group number, as an integer, or nil special
rows and table rules.  Group 1 is also table's header."
  (unless (or (eq (org-element-property :type table-row) 'rule)
	      (org-export-table-row-is-special-p table-row info))
    (let ((group 0) row-flag)
      (catch 'found
	(mapc
	 (lambda (row)
	   (cond
	    ((and (eq (org-element-property :type row) 'standard)
		  (not (org-export-table-row-is-special-p row info)))
	     (unless row-flag (incf group) (setq row-flag t)))
	    ((eq (org-element-property :type row) 'rule)
	     (setq row-flag nil)))
	   (when (eq table-row row) (throw 'found group)))
	 (org-element-contents (org-export-get-parent table-row)))))))

(defun org-export-table-cell-width (table-cell info)
  "Return TABLE-CELL contents width.

INFO is a plist used as the communication channel.

Return value is the width given by the last width cookie in the
same column as TABLE-CELL, or nil."
  (let* ((row (org-export-get-parent table-cell))
	 (column (let ((cells (org-element-contents row)))
		   (- (length cells) (length (memq table-cell cells)))))
	 (table (org-export-get-parent-table table-cell))
	 cookie-width)
    (mapc
     (lambda (row)
       (cond
	;; In a special row, try to find a width cookie at COLUMN.
	((org-export-table-row-is-special-p row info)
	 (let ((value (org-element-contents
		       (elt (org-element-contents row) column))))
	   ;; The following checks avoid expanding unnecessarily the
	   ;; cell with `org-export-data'
	   (when (and value
		      (not (cdr value))
		      (stringp (car value))
		      (string-match "\\`<[lrc]?\\([0-9]+\\)?>\\'" (car value))
		      (match-string 1 (car value)))
	     (setq cookie-width
		   (string-to-number (match-string 1 (car value)))))))
	;; Ignore table rules.
	((eq (org-element-property :type row) 'rule))))
     (org-element-contents table))
    ;; Return value.
    cookie-width))

(defun org-export-table-cell-alignment (table-cell info)
  "Return TABLE-CELL contents alignment.

INFO is a plist used as the communication channel.

Return alignment as specified by the last alignment cookie in the
same column as TABLE-CELL.  If no such cookie is found, a default
alignment value will be deduced from fraction of numbers in the
column (see `org-table-number-fraction' for more information).
Possible values are `left', `right' and `center'."
  (let* ((row (org-export-get-parent table-cell))
	 (column (let ((cells (org-element-contents row)))
		   (- (length cells) (length (memq table-cell cells)))))
	 (table (org-export-get-parent-table table-cell))
	 (number-cells 0)
	 (total-cells 0)
	 cookie-align)
    (mapc
     (lambda (row)
       (cond
	;; In a special row, try to find an alignment cookie at
	;; COLUMN.
	((org-export-table-row-is-special-p row info)
	 (let ((value (org-element-contents
		       (elt (org-element-contents row) column))))
	   ;; Since VALUE is a secondary string, the following checks
	   ;; avoid useless expansion through `org-export-data'.
	   (when (and value
		      (not (cdr value))
		      (stringp (car value))
		      (string-match "\\`<\\([lrc]\\)?\\([0-9]+\\)?>\\'"
				    (car value))
		      (match-string 1 (car value)))
	     (setq cookie-align (match-string 1 (car value))))))
	;; Ignore table rules.
	((eq (org-element-property :type row) 'rule))
	;; In a standard row, check if cell's contents are expressing
	;; some kind of number.  Increase NUMBER-CELLS accordingly.
	;; Though, don't bother if an alignment cookie has already
	;; defined cell's alignment.
	((not cookie-align)
	 (let ((value (org-export-data
		       (org-element-contents
			(elt (org-element-contents row) column))
		       info)))
	   (incf total-cells)
	   (when (string-match org-table-number-regexp value)
	     (incf number-cells))))))
     (org-element-contents table))
    ;; Return value.  Alignment specified by cookies has precedence
    ;; over alignment deduced from cells contents.
    (cond ((equal cookie-align "l") 'left)
	  ((equal cookie-align "r") 'right)
	  ((equal cookie-align "c") 'center)
	  ((>= (/ (float number-cells) total-cells) org-table-number-fraction)
	   'right)
	  (t 'left))))

(defun org-export-table-cell-borders (table-cell info)
  "Return TABLE-CELL borders.

INFO is a plist used as a communication channel.

Return value is a list of symbols, or nil.  Possible values are:
`top', `bottom', `above', `below', `left' and `right'.  Note:
`top' (resp. `bottom') only happen for a cell in the first
row (resp. last row) of the table, ignoring table rules, if any.

Returned borders ignore special rows."
  (let* ((row (org-export-get-parent table-cell))
	 (table (org-export-get-parent-table table-cell))
	 borders)
    ;; Top/above border?  TABLE-CELL has a border above when a rule
    ;; used to demarcate row groups can be found above.  Hence,
    ;; finding a rule isn't sufficient to push `above' in BORDERS:
    ;; another regular row has to be found above that rule.
    (let (rule-flag)
      (catch 'exit
	(mapc (lambda (row)
		(cond ((eq (org-element-property :type row) 'rule)
		       (setq rule-flag t))
		      ((not (org-export-table-row-is-special-p row info))
		       (if rule-flag (throw 'exit (push 'above borders))
			 (throw 'exit nil)))))
	      ;; Look at every row before the current one.
	      (cdr (memq row (reverse (org-element-contents table)))))
	;; No rule above, or rule found starts the table (ignoring any
	;; special row): TABLE-CELL is at the top of the table.
	(when rule-flag (push 'above borders))
	(push 'top borders)))
    ;; Bottom/below border? TABLE-CELL has a border below when next
    ;; non-regular row below is a rule.
    (let (rule-flag)
      (catch 'exit
	(mapc (lambda (row)
		(cond ((eq (org-element-property :type row) 'rule)
		       (setq rule-flag t))
		      ((not (org-export-table-row-is-special-p row info))
		       (if rule-flag (throw 'exit (push 'below borders))
			 (throw 'exit nil)))))
	      ;; Look at every row after the current one.
	      (cdr (memq row (org-element-contents table))))
	;; No rule below, or rule found ends the table (modulo some
	;; special row): TABLE-CELL is at the bottom of the table.
	(when rule-flag (push 'below borders))
	(push 'bottom borders)))
    ;; Right/left borders?  They can only be specified by column
    ;; groups.  Column groups are defined in a row starting with "/".
    ;; Also a column groups row only contains "<", "<>", ">" or blank
    ;; cells.
    (catch 'exit
      (let ((column (let ((cells (org-element-contents row)))
		      (- (length cells) (length (memq table-cell cells))))))
	(mapc
	 (lambda (row)
	   (unless (eq (org-element-property :type row) 'rule)
	     (when (equal (org-element-contents
			   (car (org-element-contents row)))
			  '("/"))
	       (let ((column-groups
		      (mapcar
		       (lambda (cell)
			 (let ((value (org-element-contents cell)))
			   (when (member value '(("<") ("<>") (">") nil))
			     (car value))))
		       (org-element-contents row))))
		 ;; There's a left border when previous cell, if
		 ;; any, ends a group, or current one starts one.
		 (when (or (and (not (zerop column))
				(member (elt column-groups (1- column))
					'(">" "<>")))
			   (member (elt column-groups column) '("<" "<>")))
		   (push 'left borders))
		 ;; There's a right border when next cell, if any,
		 ;; starts a group, or current one ends one.
		 (when (or (and (/= (1+ column) (length column-groups))
				(member (elt column-groups (1+ column))
					'("<" "<>")))
			   (member (elt column-groups column) '(">" "<>")))
		   (push 'right borders))
		 (throw 'exit nil)))))
	 ;; Table rows are read in reverse order so last column groups
	 ;; row has precedence over any previous one.
	 (reverse (org-element-contents table)))))
    ;; Return value.
    borders))

(defun org-export-table-cell-starts-colgroup-p (table-cell info)
  "Non-nil when TABLE-CELL is at the beginning of a row group.
INFO is a plist used as a communication channel."
  ;; A cell starts a column group either when it is at the beginning
  ;; of a row (or after the special column, if any) or when it has
  ;; a left border.
  (or (eq (org-element-map (org-export-get-parent table-cell) 'table-cell
	    'identity info 'first-match)
	  table-cell)
      (memq 'left (org-export-table-cell-borders table-cell info))))

(defun org-export-table-cell-ends-colgroup-p (table-cell info)
  "Non-nil when TABLE-CELL is at the end of a row group.
INFO is a plist used as a communication channel."
  ;; A cell ends a column group either when it is at the end of a row
  ;; or when it has a right border.
  (or (eq (car (last (org-element-contents
			 (org-export-get-parent table-cell))))
	     table-cell)
      (memq 'right (org-export-table-cell-borders table-cell info))))

(defun org-export-table-row-starts-rowgroup-p (table-row info)
  "Non-nil when TABLE-ROW is at the beginning of a column group.
INFO is a plist used as a communication channel."
  (unless (or (eq (org-element-property :type table-row) 'rule)
	      (org-export-table-row-is-special-p table-row info))
    (let ((borders (org-export-table-cell-borders
		    (car (org-element-contents table-row)) info)))
      (or (memq 'top borders) (memq 'above borders)))))

(defun org-export-table-row-ends-rowgroup-p (table-row info)
  "Non-nil when TABLE-ROW is at the end of a column group.
INFO is a plist used as a communication channel."
  (unless (or (eq (org-element-property :type table-row) 'rule)
	      (org-export-table-row-is-special-p table-row info))
    (let ((borders (org-export-table-cell-borders
		    (car (org-element-contents table-row)) info)))
      (or (memq 'bottom borders) (memq 'below borders)))))

(defun org-export-table-row-starts-header-p (table-row info)
  "Non-nil when TABLE-ROW is the first table header's row.
INFO is a plist used as a communication channel."
  (and (org-export-table-has-header-p
	(org-export-get-parent-table table-row) info)
       (org-export-table-row-starts-rowgroup-p table-row info)
       (= (org-export-table-row-group table-row info) 1)))

(defun org-export-table-row-ends-header-p (table-row info)
  "Non-nil when TABLE-ROW is the last table header's row.
INFO is a plist used as a communication channel."
  (and (org-export-table-has-header-p
	(org-export-get-parent-table table-row) info)
       (org-export-table-row-ends-rowgroup-p table-row info)
       (= (org-export-table-row-group table-row info) 1)))

(defun org-export-table-dimensions (table info)
  "Return TABLE dimensions.

INFO is a plist used as a communication channel.

Return value is a CONS like (ROWS . COLUMNS) where
ROWS (resp. COLUMNS) is the number of exportable
rows (resp. columns)."
  (let (first-row (columns 0) (rows 0))
    ;; Set number of rows, and extract first one.
    (org-element-map table 'table-row
      (lambda (row)
	(when (eq (org-element-property :type row) 'standard)
	  (incf rows)
	  (unless first-row (setq first-row row)))) info)
    ;; Set number of columns.
    (org-element-map first-row 'table-cell (lambda (cell) (incf columns)) info)
    ;; Return value.
    (cons rows columns)))

(defun org-export-table-cell-address (table-cell info)
  "Return address of a regular TABLE-CELL object.

TABLE-CELL is the cell considered.  INFO is a plist used as
a communication channel.

Address is a CONS cell (ROW . COLUMN), where ROW and COLUMN are
zero-based index.  Only exportable cells are considered.  The
function returns nil for other cells."
  (let* ((table-row (org-export-get-parent table-cell))
	 (table (org-export-get-parent-table table-cell)))
    ;; Ignore cells in special rows or in special column.
    (unless (or (org-export-table-row-is-special-p table-row info)
		(and (org-export-table-has-special-column-p table)
		     (eq (car (org-element-contents table-row)) table-cell)))
      (cons
       ;; Row number.
       (let ((row-count 0))
	 (org-element-map table 'table-row
	   (lambda (row)
	     (cond ((eq (org-element-property :type row) 'rule) nil)
		   ((eq row table-row) row-count)
		   (t (incf row-count) nil)))
	   info 'first-match))
       ;; Column number.
       (let ((col-count 0))
	 (org-element-map table-row 'table-cell
	   (lambda (cell)
	     (if (eq cell table-cell) col-count (incf col-count) nil))
	   info 'first-match))))))

(defun org-export-get-table-cell-at (address table info)
  "Return regular table-cell object at ADDRESS in TABLE.

Address is a CONS cell (ROW . COLUMN), where ROW and COLUMN are
zero-based index.  TABLE is a table type element.  INFO is
a plist used as a communication channel.

If no table-cell, among exportable cells, is found at ADDRESS,
return nil."
  (let ((column-pos (cdr address)) (column-count 0))
    (org-element-map
	;; Row at (car address) or nil.
	(let ((row-pos (car address)) (row-count 0))
	  (org-element-map table 'table-row
	    (lambda (row)
	      (cond ((eq (org-element-property :type row) 'rule) nil)
		    ((= row-count row-pos) row)
		    (t (incf row-count) nil)))
	    info 'first-match))
	'table-cell
      (lambda (cell)
	(if (= column-count column-pos) cell
	  (incf column-count) nil))
      info 'first-match)))


;;;; For Tables Of Contents
;;
;; `org-export-collect-headlines' builds a list of all exportable
;; headline elements, maybe limited to a certain depth.  One can then
;; easily parse it and transcode it.
;;
;; Building lists of tables, figures or listings is quite similar.
;; Once the generic function `org-export-collect-elements' is defined,
;; `org-export-collect-tables', `org-export-collect-figures' and
;; `org-export-collect-listings' can be derived from it.

(defun org-export-collect-headlines (info &optional n)
  "Collect headlines in order to build a table of contents.

INFO is a plist used as a communication channel.

When optional argument N is an integer, it specifies the depth of
the table of contents.  Otherwise, it is set to the value of the
last headline level.  See `org-export-headline-levels' for more
information.

Return a list of all exportable headlines as parsed elements."
  (unless (wholenump n) (setq n (plist-get info :headline-levels)))
  (org-element-map (plist-get info :parse-tree) 'headline
    (lambda (headline)
      ;; Strip contents from HEADLINE.
      (let ((relative-level (org-export-get-relative-level headline info)))
	(unless (> relative-level n) headline)))
    info))

(defun org-export-collect-elements (type info &optional predicate)
  "Collect referenceable elements of a determined type.

TYPE can be a symbol or a list of symbols specifying element
types to search.  Only elements with a caption are collected.

INFO is a plist used as a communication channel.

When non-nil, optional argument PREDICATE is a function accepting
one argument, an element of type TYPE.  It returns a non-nil
value when that element should be collected.

Return a list of all elements found, in order of appearance."
  (org-element-map (plist-get info :parse-tree) type
    (lambda (element)
      (and (org-element-property :caption element)
	   (or (not predicate) (funcall predicate element))
	   element))
    info))

(defun org-export-collect-tables (info)
  "Build a list of tables.
INFO is a plist used as a communication channel.

Return a list of table elements with a caption."
  (org-export-collect-elements 'table info))

(defun org-export-collect-figures (info predicate)
  "Build a list of figures.

INFO is a plist used as a communication channel.  PREDICATE is
a function which accepts one argument: a paragraph element and
whose return value is non-nil when that element should be
collected.

A figure is a paragraph type element, with a caption, verifying
PREDICATE.  The latter has to be provided since a \"figure\" is
a vague concept that may depend on back-end.

Return a list of elements recognized as figures."
  (org-export-collect-elements 'paragraph info predicate))

(defun org-export-collect-listings (info)
  "Build a list of src blocks.

INFO is a plist used as a communication channel.

Return a list of src-block elements with a caption."
  (org-export-collect-elements 'src-block info))


;;;; Smart Quotes
;;
;; The main function for the smart quotes sub-system is
;; `org-export-activate-smart-quotes', which replaces every quote in
;; a given string from the parse tree with its "smart" counterpart.
;;
;; Dictionary for smart quotes is stored in
;; `org-export-smart-quotes-alist'.
;;
;; Internally, regexps matching potential smart quotes (checks at
;; string boundaries are also necessary) are defined in
;; `org-export-smart-quotes-regexps'.

(defconst org-export-smart-quotes-alist
  '(("de"
     (opening-double-quote :utf-8 "„" :html "&bdquo;" :latex "\"`"
			   :texinfo "@quotedblbase{}")
     (closing-double-quote :utf-8 "“" :html "&ldquo;" :latex "\"'"
			   :texinfo "@quotedblleft{}")
     (opening-single-quote :utf-8 "‚" :html "&sbquo;" :latex "\\glq{}"
			   :texinfo "@quotesinglbase{}")
     (closing-single-quote :utf-8 "‘" :html "&lsquo;" :latex "\\grq{}"
			   :texinfo "@quoteleft{}")
     (apostrophe :utf-8 "’" :html "&rsquo;"))
    ("en"
     (opening-double-quote :utf-8 "“" :html "&ldquo;" :latex "``" :texinfo "``")
     (closing-double-quote :utf-8 "”" :html "&rdquo;" :latex "''" :texinfo "''")
     (opening-single-quote :utf-8 "‘" :html "&lsquo;" :latex "`" :texinfo "`")
     (closing-single-quote :utf-8 "’" :html "&rsquo;" :latex "'" :texinfo "'")
     (apostrophe :utf-8 "’" :html "&rsquo;"))
    ("es"
     (opening-double-quote :utf-8 "«" :html "&laquo;" :latex "\\guillemotleft{}"
			   :texinfo "@guillemetleft{}")
     (closing-double-quote :utf-8 "»" :html "&raquo;" :latex "\\guillemotright{}"
			   :texinfo "@guillemetright{}")
     (opening-single-quote :utf-8 "“" :html "&ldquo;" :latex "``" :texinfo "``")
     (closing-single-quote :utf-8 "”" :html "&rdquo;" :latex "''" :texinfo "''")
     (apostrophe :utf-8 "’" :html "&rsquo;"))
    ("fr"
     (opening-double-quote :utf-8 "« " :html "&laquo;&nbsp;" :latex "\\og "
			   :texinfo "@guillemetleft{}@tie{}")
     (closing-double-quote :utf-8 " »" :html "&nbsp;&raquo;" :latex "\\fg{}"
			   :texinfo "@tie{}@guillemetright{}")
     (opening-single-quote :utf-8 "« " :html "&laquo;&nbsp;" :latex "\\og "
			   :texinfo "@guillemetleft{}@tie{}")
     (closing-single-quote :utf-8 " »" :html "&nbsp;&raquo;" :latex "\\fg{}"
			   :texinfo "@tie{}@guillemetright{}")
     (apostrophe :utf-8 "’" :html "&rsquo;")))
  "Smart quotes translations.

Alist whose CAR is a language string and CDR is an alist with
quote type as key and a plist associating various encodings to
their translation as value.

A quote type can be any symbol among `opening-double-quote',
`closing-double-quote', `opening-single-quote',
`closing-single-quote' and `apostrophe'.

Valid encodings include `:utf-8', `:html', `:latex' and
`:texinfo'.

If no translation is found, the quote character is left as-is.")

(defconst org-export-smart-quotes-regexps
  (list
   ;; Possible opening quote at beginning of string.
   "\\`\\([\"']\\)\\(\\w\\|\\s.\\|\\s_\\)"
   ;; Possible closing quote at beginning of string.
   "\\`\\([\"']\\)\\(\\s-\\|\\s)\\|\\s.\\)"
   ;; Possible apostrophe at beginning of string.
   "\\`\\('\\)\\S-"
   ;; Opening single and double quotes.
   "\\(?:\\s-\\|\\s(\\)\\([\"']\\)\\(?:\\w\\|\\s.\\|\\s_\\)"
   ;; Closing single and double quotes.
   "\\(?:\\w\\|\\s.\\|\\s_\\)\\([\"']\\)\\(?:\\s-\\|\\s)\\|\\s.\\)"
   ;; Apostrophe.
   "\\S-\\('\\)\\S-"
   ;; Possible opening quote at end of string.
   "\\(?:\\s-\\|\\s(\\)\\([\"']\\)\\'"
   ;; Possible closing quote at end of string.
   "\\(?:\\w\\|\\s.\\|\\s_\\)\\([\"']\\)\\'"
   ;; Possible apostrophe at end of string.
   "\\S-\\('\\)\\'")
  "List of regexps matching a quote or an apostrophe.
In every regexp, quote or apostrophe matched is put in group 1.")

(defun org-export-activate-smart-quotes (s encoding info &optional original)
  "Replace regular quotes with \"smart\" quotes in string S.

ENCODING is a symbol among `:html', `:latex', `:texinfo' and
`:utf-8'.  INFO is a plist used as a communication channel.

The function has to retrieve information about string
surroundings in parse tree.  It can only happen with an
unmodified string.  Thus, if S has already been through another
process, a non-nil ORIGINAL optional argument will provide that
original string.

Return the new string."
  (if (equal s "") ""
    (let* ((prev (org-export-get-previous-element (or original s) info))
	   ;; Try to be flexible when computing number of blanks
	   ;; before object.  The previous object may be a string
	   ;; introduced by the back-end and not completely parsed.
	   (pre-blank (and prev
			   (or (org-element-property :post-blank prev)
			       ;; A string with missing `:post-blank'
			       ;; property.
			       (and (stringp prev)
				    (string-match " *\\'" prev)
				    (length (match-string 0 prev)))
			       ;; Fallback value.
			       0)))
	   (next (org-export-get-next-element (or original s) info))
	   (get-smart-quote
	    (lambda (q type)
	      ;; Return smart quote associated to a give quote Q, as
	      ;; a string.  TYPE is a symbol among `open', `close' and
	      ;; `apostrophe'.
	      (let ((key (case type
			   (apostrophe 'apostrophe)
			   (open (if (equal "'" q) 'opening-single-quote
				   'opening-double-quote))
			   (otherwise (if (equal "'" q) 'closing-single-quote
					'closing-double-quote)))))
		(or (plist-get
		     (cdr (assq key
				(cdr (assoc (plist-get info :language)
					    org-export-smart-quotes-alist))))
		     encoding)
		    q)))))
      (if (or (equal "\"" s) (equal "'" s))
	  ;; Only a quote: no regexp can match.  We have to check both
	  ;; sides and decide what to do.
	  (cond ((and (not prev) (not next)) s)
		((not prev) (funcall get-smart-quote s 'open))
		((and (not next) (zerop pre-blank))
		 (funcall get-smart-quote s 'close))
		((not next) s)
		((zerop pre-blank) (funcall get-smart-quote s 'apostrophe))
		(t (funcall get-smart-quote 'open)))
	;; 1. Replace quote character at the beginning of S.
	(cond
	 ;; Apostrophe?
	 ((and prev (zerop pre-blank)
	       (string-match (nth 2 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'apostrophe)
		   nil t s 1)))
	 ;; Closing quote?
	 ((and prev (zerop pre-blank)
	       (string-match (nth 1 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'close)
		   nil t s 1)))
	 ;; Opening quote?
	 ((and (or (not prev) (> pre-blank 0))
	       (string-match (nth 0 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'open)
		   nil t s 1))))
	;; 2. Replace quotes in the middle of the string.
	(setq s (replace-regexp-in-string
		 ;; Opening quotes.
		 (nth 3 org-export-smart-quotes-regexps)
		 (lambda (text)
		   (funcall get-smart-quote (match-string 1 text) 'open))
		 s nil t 1))
	(setq s (replace-regexp-in-string
		 ;; Closing quotes.
		 (nth 4 org-export-smart-quotes-regexps)
		 (lambda (text)
		   (funcall get-smart-quote (match-string 1 text) 'close))
		 s nil t 1))
	(setq s (replace-regexp-in-string
		 ;; Apostrophes.
		 (nth 5 org-export-smart-quotes-regexps)
		 (lambda (text)
		   (funcall get-smart-quote (match-string 1 text) 'apostrophe))
		 s nil t 1))
	;; 3. Replace quote character at the end of S.
	(cond
	 ;; Apostrophe?
	 ((and next (string-match (nth 8 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'apostrophe)
		   nil t s 1)))
	 ;; Closing quote?
	 ((and (not next)
	       (string-match (nth 7 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'close)
		   nil t s 1)))
	 ;; Opening quote?
	 ((and next (string-match (nth 6 org-export-smart-quotes-regexps) s))
	  (setq s (replace-match
		   (funcall get-smart-quote (match-string 1 s) 'open)
		   nil t s 1))))
	;; Return string with smart quotes.
	s))))

;;;; Topology
;;
;; Here are various functions to retrieve information about the
;; neighbourhood of a given element or object.  Neighbours of interest
;; are direct parent (`org-export-get-parent'), parent headline
;; (`org-export-get-parent-headline'), first element containing an
;; object, (`org-export-get-parent-element'), parent table
;; (`org-export-get-parent-table'), previous element or object
;; (`org-export-get-previous-element') and next element or object
;; (`org-export-get-next-element').
;;
;; `org-export-get-genealogy' returns the full genealogy of a given
;; element or object, from closest parent to full parse tree.

(defun org-export-get-parent (blob)
  "Return BLOB parent or nil.
BLOB is the element or object considered."
  (org-element-property :parent blob))

(defun org-export-get-genealogy (blob)
  "Return full genealogy relative to a given element or object.

BLOB is the element or object being considered.

Ancestors are returned from closest to farthest, the last one
being the full parse tree."
  (let (genealogy (parent blob))
    (while (setq parent (org-element-property :parent parent))
      (push parent genealogy))
    (nreverse genealogy)))

(defun org-export-get-parent-headline (blob)
  "Return BLOB parent headline or nil.
BLOB is the element or object being considered."
  (let ((parent blob))
    (while (and (setq parent (org-element-property :parent parent))
		(not (eq (org-element-type parent) 'headline))))
    parent))

(defun org-export-get-parent-element (object)
  "Return first element containing OBJECT or nil.
OBJECT is the object to consider."
  (let ((parent object))
    (while (and (setq parent (org-element-property :parent parent))
		(memq (org-element-type parent) org-element-all-objects)))
    parent))

(defun org-export-get-parent-table (object)
  "Return OBJECT parent table or nil.
OBJECT is either a `table-cell' or `table-element' type object."
  (let ((parent object))
    (while (and (setq parent (org-element-property :parent parent))
		(not (eq (org-element-type parent) 'table))))
    parent))

(defun org-export-get-previous-element (blob info &optional n)
  "Return previous element or object.

BLOB is an element or object.  INFO is a plist used as
a communication channel.  Return previous exportable element or
object, a string, or nil.

When optional argument N is a positive integer, return a list
containing up to N siblings before BLOB, from closest to
farthest.  With any other non-nil value, return a list containing
all of them."
  (let ((siblings
	 ;; An object can belong to the contents of its parent or
	 ;; to a secondary string.  We check the latter option
	 ;; first.
	 (let ((parent (org-export-get-parent blob)))
	   (or (and (not (memq (org-element-type blob)
			       org-element-all-elements))
		    (let ((sec-value
			   (org-element-property
			    (cdr (assq (org-element-type parent)
				       org-element-secondary-value-alist))
			    parent)))
		      (and (memq blob sec-value) sec-value)))
	       (org-element-contents parent))))
	prev)
    (catch 'exit
      (mapc (lambda (obj)
	      (cond ((memq obj (plist-get info :ignore-list)))
		    ((null n) (throw 'exit obj))
		    ((not (wholenump n)) (push obj prev))
		    ((zerop n) (throw 'exit (nreverse prev)))
		    (t (decf n) (push obj prev))))
	    (cdr (memq blob (reverse siblings))))
      (nreverse prev))))

(defun org-export-get-next-element (blob info &optional n)
  "Return next element or object.

BLOB is an element or object.  INFO is a plist used as
a communication channel.  Return next exportable element or
object, a string, or nil.

When optional argument N is a positive integer, return a list
containing up to N siblings after BLOB, from closest to farthest.
With any other non-nil value, return a list containing all of
them."
  (let ((siblings
	 ;; An object can belong to the contents of its parent or to
	 ;; a secondary string.  We check the latter option first.
	 (let ((parent (org-export-get-parent blob)))
	   (or (and (not (memq (org-element-type blob)
			       org-element-all-objects))
		    (let ((sec-value
			   (org-element-property
			    (cdr (assq (org-element-type parent)
				       org-element-secondary-value-alist))
			    parent)))
		      (cdr (memq blob sec-value))))
	       (cdr (memq blob (org-element-contents parent))))))
	next)
    (catch 'exit
      (mapc (lambda (obj)
	      (cond ((memq obj (plist-get info :ignore-list)))
		    ((null n) (throw 'exit obj))
		    ((not (wholenump n)) (push obj next))
		    ((zerop n) (throw 'exit (nreverse next)))
		    (t (decf n) (push obj next))))
	    siblings)
      (nreverse next))))


;;;; Translation
;;
;; `org-export-translate' translates a string according to language
;; specified by LANGUAGE keyword or `org-export-language-setup'
;; variable and a specified charset.  `org-export-dictionary' contains
;; the dictionary used for the translation.

(defconst org-export-dictionary
  '(("Author"
     ("ca" :default "Autor")
     ("cs" :default "Autor")
     ("da" :default "Ophavsmand")
     ("de" :default "Autor")
     ("eo" :html "A&#365;toro")
     ("es" :default "Autor")
     ("fi" :html "Tekij&auml;")
     ("fr" :default "Auteur")
     ("hu" :default "Szerz&otilde;")
     ("is" :html "H&ouml;fundur")
     ("it" :default "Autore")
     ("ja" :html "&#33879;&#32773;" :utf-8 "著者")
     ("nl" :default "Auteur")
     ("no" :default "Forfatter")
     ("nb" :default "Forfatter")
     ("nn" :default "Forfattar")
     ("pl" :default "Autor")
     ("ru" :html "&#1040;&#1074;&#1090;&#1086;&#1088;" :utf-8 "Автор")
     ("sv" :html "F&ouml;rfattare")
     ("uk" :html "&#1040;&#1074;&#1090;&#1086;&#1088;" :utf-8 "Автор")
     ("zh-CN" :html "&#20316;&#32773;" :utf-8 "作者")
     ("zh-TW" :html "&#20316;&#32773;" :utf-8 "作者"))
    ("Date"
     ("ca" :default "Data")
     ("cs" :default "Datum")
     ("da" :default "Dato")
     ("de" :default "Datum")
     ("eo" :default "Dato")
     ("es" :default "Fecha")
     ("fi" :html "P&auml;iv&auml;m&auml;&auml;r&auml;")
     ("hu" :html "D&aacute;tum")
     ("is" :default "Dagsetning")
     ("it" :default "Data")
     ("ja" :html "&#26085;&#20184;" :utf-8 "日付")
     ("nl" :default "Datum")
     ("no" :default "Dato")
     ("nb" :default "Dato")
     ("nn" :default "Dato")
     ("pl" :default "Data")
     ("ru" :html "&#1044;&#1072;&#1090;&#1072;" :utf-8 "Дата")
     ("sv" :default "Datum")
     ("uk" :html "&#1044;&#1072;&#1090;&#1072;" :utf-8 "Дата")
     ("zh-CN" :html "&#26085;&#26399;" :utf-8 "日期")
     ("zh-TW" :html "&#26085;&#26399;" :utf-8 "日期"))
    ("Equation"
     ("fr" :ascii "Equation" :default "Équation"))
    ("Figure")
    ("Footnotes"
     ("ca" :html "Peus de p&agrave;gina")
     ("cs" :default "Pozn\xe1mky pod carou")
     ("da" :default "Fodnoter")
     ("de" :html "Fu&szlig;noten")
     ("eo" :default "Piednotoj")
     ("es" :html "Pies de p&aacute;gina")
     ("fi" :default "Alaviitteet")
     ("fr" :default "Notes de bas de page")
     ("hu" :html "L&aacute;bjegyzet")
     ("is" :html "Aftanm&aacute;lsgreinar")
     ("it" :html "Note a pi&egrave; di pagina")
     ("ja" :html "&#33050;&#27880;" :utf-8 "脚注")
     ("nl" :default "Voetnoten")
     ("no" :default "Fotnoter")
     ("nb" :default "Fotnoter")
     ("nn" :default "Fotnotar")
     ("pl" :default "Przypis")
     ("ru" :html "&#1057;&#1085;&#1086;&#1089;&#1082;&#1080;" :utf-8 "Сноски")
     ("sv" :default "Fotnoter")
     ("uk" :html "&#1055;&#1088;&#1080;&#1084;&#1110;&#1090;&#1082;&#1080;"
      :utf-8 "Примітки")
     ("zh-CN" :html "&#33050;&#27880;" :utf-8 "脚注")
     ("zh-TW" :html "&#33139;&#35387;" :utf-8 "腳註"))
    ("List of Listings"
     ("fr" :default "Liste des programmes"))
    ("List of Tables"
     ("fr" :default "Liste des tableaux"))
    ("Listing %d:"
     ("fr"
      :ascii "Programme %d :" :default "Programme nº %d :"
      :latin1 "Programme %d :"))
    ("Listing %d: %s"
     ("fr"
      :ascii "Programme %d : %s" :default "Programme nº %d : %s"
      :latin1 "Programme %d : %s"))
    ("See section %s"
     ("fr" :default "cf. section %s"))
    ("Table %d:"
     ("fr"
      :ascii "Tableau %d :" :default "Tableau nº %d :" :latin1 "Tableau %d :"))
    ("Table %d: %s"
     ("fr"
      :ascii "Tableau %d : %s" :default "Tableau nº %d : %s"
      :latin1 "Tableau %d : %s"))
    ("Table of Contents"
     ("ca" :html "&Iacute;ndex")
     ("cs" :default "Obsah")
     ("da" :default "Indhold")
     ("de" :default "Inhaltsverzeichnis")
     ("eo" :default "Enhavo")
     ("es" :html "&Iacute;ndice")
     ("fi" :html "Sis&auml;llysluettelo")
     ("fr" :ascii "Sommaire" :default "Table des matières")
     ("hu" :html "Tartalomjegyz&eacute;k")
     ("is" :default "Efnisyfirlit")
     ("it" :default "Indice")
     ("ja" :html "&#30446;&#27425;" :utf-8 "目次")
     ("nl" :default "Inhoudsopgave")
     ("no" :default "Innhold")
     ("nb" :default "Innhold")
     ("nn" :default "Innhald")
     ("pl" :html "Spis tre&#x015b;ci")
     ("ru" :html "&#1057;&#1086;&#1076;&#1077;&#1088;&#1078;&#1072;&#1085;&#1080;&#1077;"
      :utf-8 "Содержание")
     ("sv" :html "Inneh&aring;ll")
     ("uk" :html "&#1047;&#1084;&#1110;&#1089;&#1090;" :utf-8 "Зміст")
     ("zh-CN" :html "&#30446;&#24405;" :utf-8 "目录")
     ("zh-TW" :html "&#30446;&#37636;" :utf-8 "目錄"))
    ("Unknown reference"
     ("fr" :ascii "Destination inconnue" :default "Référence inconnue")))
  "Dictionary for export engine.

Alist whose CAR is the string to translate and CDR is an alist
whose CAR is the language string and CDR is a plist whose
properties are possible charsets and values translated terms.

It is used as a database for `org-export-translate'. Since this
function returns the string as-is if no translation was found,
the variable only needs to record values different from the
entry.")

(defun org-export-translate (s encoding info)
  "Translate string S according to language specification.

ENCODING is a symbol among `:ascii', `:html', `:latex', `:latin1'
and `:utf-8'.  INFO is a plist used as a communication channel.

Translation depends on `:language' property. Return the
translated string. If no translation is found, try to fall back
to `:default' encoding. If it fails, return S."
  (let* ((lang (plist-get info :language))
	 (translations (cdr (assoc lang
				   (cdr (assoc s org-export-dictionary))))))
    (or (plist-get translations encoding)
	(plist-get translations :default)
	s)))



;;; Asynchronous Export
;;
;; `org-export-async-start' is the entry point for asynchronous
;; export.  It recreates current buffer (including visibility,
;; narrowing and visited file) in an external Emacs process, and
;; evaluates a command there.  It then applies a function on the
;; returned results in the current process.
;;
;; Asynchronously generated results are never displayed directly.
;; Instead, they are stored in `org-export-stack-contents'.  They can
;; then be retrieved by calling `org-export-stack'.
;;
;; Export Stack is viewed through a dedicated major mode
;;`org-export-stack-mode' and tools: `org-export-stack-refresh',
;;`org-export-stack-delete', `org-export-stack-view' and
;;`org-export-stack-clear'.
;;
;; For back-ends, `org-export-add-to-stack' add a new source to stack.
;; It should used whenever `org-export-async-start' is called.

(defmacro org-export-async-start  (fun &rest body)
  "Call function FUN on the results returned by BODY evaluation.

BODY evaluation happens in an asynchronous process, from a buffer
which is an exact copy of the current one.

Use `org-export-add-to-stack' in FUN in order to register results
in the stack.  Examples for, respectively a temporary buffer and
a file are:

  \(org-export-async-start
      \(lambda (output)
        \(with-current-buffer (get-buffer-create \"*Org BACKEND Export*\")
        \(erase-buffer)
        \(insert output)
        \(goto-char (point-min))
        \(org-export-add-to-stack (current-buffer) 'backend)))
    `(org-export-as 'backend ,subtreep ,visible-only ,body-only ',ext-plist))

and

  \(org-export-async-start
      \(lambda (f) (org-export-add-to-stack f 'backend))
    `(expand-file-name
      \(org-export-to-file
       'backend ,outfile ,subtreep ,visible-only ,body-only ',ext-plist)))"
  (declare (indent 1) (debug t))
  (org-with-gensyms (process temp-file copy-fun proc-buffer handler)
    ;; Write the full sexp evaluating BODY in a copy of the current
    ;; buffer to a temporary file, as it may be too long for program
    ;; args in `start-process'.
    `(with-temp-message "Initializing asynchronous export process"
       (let ((,copy-fun (org-export--generate-copy-script (current-buffer)))
	     (,temp-file (make-temp-file "org-export-process")))
	 (with-temp-file ,temp-file
	   (insert
	    (format
	     "%S"
	     `(with-temp-buffer
		,(when org-export-async-debug '(setq debug-on-error t))
		;; Initialize `org-mode' in the external process.
		(org-mode)
		;; Re-create current buffer there.
		(funcall ,,copy-fun)
		(restore-buffer-modified-p nil)
		;; Sexp to evaluate in the buffer.
		(print (progn ,,@body))))))
	 ;; Start external process.
	 (let* ((process-connection-type nil)
		(,proc-buffer (generate-new-buffer-name "*Org Export Process*"))
		(,process
		 (start-process
		  "org-export-process" ,proc-buffer
		  (expand-file-name invocation-name invocation-directory)
		  "-Q" "--batch"
		  "-l" org-export-async-init-file
		  "-l" ,temp-file)))
	   ;; Register running process in stack.
	   (org-export-add-to-stack (get-buffer ,proc-buffer) nil ,process)
	   ;; Set-up sentinel in order to catch results.
	   (set-process-sentinel
	    ,process
	    (let ((handler ',fun))
	      `(lambda (p status)
		 (let ((proc-buffer (process-buffer p)))
		   (when (eq (process-status p) 'exit)
		     (unwind-protect
			 (if (zerop (process-exit-status p))
			     (unwind-protect
				 (let ((results
					(with-current-buffer proc-buffer
					  (goto-char (point-max))
					  (backward-sexp)
					  (read (current-buffer)))))
				   (funcall ,handler results))
			       (unless org-export-async-debug
				 (and (get-buffer proc-buffer)
				      (kill-buffer proc-buffer))))
			   (org-export-add-to-stack proc-buffer nil p)
			   (ding)
			   (message "Process '%s' exited abnormally" p))
		       (unless org-export-async-debug
			 (delete-file ,,temp-file)))))))))))))

(defun org-export-add-to-stack (source backend &optional process)
  "Add a new result to export stack if not present already.

SOURCE is a buffer or a file name containing export results.
BACKEND is a symbol representing export back-end used to generate
it.

Entries already pointing to SOURCE and unavailable entries are
removed beforehand.  Return the new stack."
  (setq org-export-stack-contents
	(cons (list source backend (or process (current-time)))
	      (org-export-stack-remove source))))

(defun org-export-stack ()
  "Menu for asynchronous export results and running processes."
  (interactive)
  (let ((buffer (get-buffer-create "*Org Export Stack*")))
    (set-buffer buffer)
    (when (zerop (buffer-size)) (org-export-stack-mode))
    (org-export-stack-refresh)
    (pop-to-buffer buffer))
  (message "Type \"q\" to quit, \"?\" for help"))

(defun org-export--stack-source-at-point ()
  "Return source from export results at point in stack."
  (let ((source (car (nth (1- (org-current-line)) org-export-stack-contents))))
    (if (not source) (error "Source unavailable, please refresh buffer")
      (let ((source-name (if (stringp source) source (buffer-name source))))
	(if (save-excursion
	      (beginning-of-line)
	      (looking-at (concat ".* +" (regexp-quote source-name) "$")))
	    source
	  ;; SOURCE is not consistent with current line.  The stack
	  ;; view is outdated.
	  (error "Source unavailable; type `g' to update buffer"))))))

(defun org-export-stack-clear ()
  "Remove all entries from export stack."
  (interactive)
  (setq org-export-stack-contents nil))

(defun org-export-stack-refresh (&rest dummy)
  "Refresh the asynchronous export stack.
DUMMY is ignored.  Unavailable sources are removed from the list.
Return the new stack."
  (let ((inhibit-read-only t))
    (org-preserve-lc
     (erase-buffer)
     (insert (concat
	      (let ((counter 0))
		(mapconcat
		 (lambda (entry)
		   (let ((proc-p (processp (nth 2 entry))))
		     (concat
		      ;; Back-end.
		      (format " %-12s  " (or (nth 1 entry) ""))
		      ;; Age.
		      (let ((data (nth 2 entry)))
			(if proc-p (format " %6s  " (process-status data))
			  ;; Compute age of the results.
			  (org-format-seconds
			   "%4h:%.2m  "
			   (float-time (time-since data)))))
		      ;; Source.
		      (format " %s"
			      (let ((source (car entry)))
				(if (stringp source) source
				  (buffer-name source)))))))
		 ;; Clear stack from exited processes, dead buffers or
		 ;; non-existent files.
		 (setq org-export-stack-contents
		       (org-remove-if-not
			(lambda (el)
			  (if (processp (nth 2 el))
			      (buffer-live-p (process-buffer (nth 2 el)))
			    (let ((source (car el)))
			      (if (bufferp source) (buffer-live-p source)
				(file-exists-p source)))))
			org-export-stack-contents)) "\n")))))))

(defun org-export-stack-remove (&optional source)
  "Remove export results at point from stack.
If optional argument SOURCE is non-nil, remove it instead."
  (interactive)
  (let ((source (or source (org-export--stack-source-at-point))))
    (setq org-export-stack-contents
	  (org-remove-if (lambda (el) (equal (car el) source))
			 org-export-stack-contents))))

(defun org-export-stack-view (&optional in-emacs)
  "View export results at point in stack.
With an optional prefix argument IN-EMACS, force viewing files
within Emacs."
  (interactive "P")
  (let ((source (org-export--stack-source-at-point)))
    (cond ((processp source)
	   (org-switch-to-buffer-other-window (process-buffer source)))
	  ((bufferp source) (org-switch-to-buffer-other-window source))
	  (t (org-open-file source in-emacs)))))

(defconst org-export-stack-mode-map
  (let ((km (make-sparse-keymap)))
    (define-key km " " 'next-line)
    (define-key km "n" 'next-line)
    (define-key km "\C-n" 'next-line)
    (define-key km [down] 'next-line)
    (define-key km "p" 'previous-line)
    (define-key km "\C-p" 'previous-line)
    (define-key km "\C-?" 'previous-line)
    (define-key km [up] 'previous-line)
    (define-key km "C" 'org-export-stack-clear)
    (define-key km "v" 'org-export-stack-view)
    (define-key km (kbd "RET") 'org-export-stack-view)
    (define-key km "d" 'org-export-stack-remove)
    km)
  "Keymap for Org Export Stack.")

(define-derived-mode org-export-stack-mode special-mode "Org-Stack"
  "Mode for displaying asynchronous export stack.

Type \\[org-export-stack] to visualize the asynchronous export
stack.

In an Org Export Stack buffer, use \\<org-export-stack-mode-map>\\[org-export-stack-view] to view export output
on current line, \\[org-export-stack-remove] to remove it from the stack and \\[org-export-stack-clear] to clear
stack completely.

Removal entries in an Org Export Stack buffer doesn't affect
files or buffers, only view in the stack.

\\{org-export-stack-mode-map}"
  (abbrev-mode 0)
  (auto-fill-mode 0)
  (setq buffer-read-only t
	buffer-undo-list t
	truncate-lines t
	header-line-format
	'(:eval
	  (format "  %-12s | %6s | %s" "Back-End" "Age" "Source")))
  (add-hook 'post-command-hook 'org-export-stack-refresh nil t)
  (set (make-local-variable 'revert-buffer-function)
       'org-export-stack-refresh))



;;; The Dispatcher
;;
;; `org-export-dispatch' is the standard interactive way to start an
;; export process.  It uses `org-export-dispatch-ui' as a subroutine
;; for its interface, which, in turn, delegates response to key
;; pressed to `org-export-dispatch-action'.

;;;###autoload
(defun org-export-dispatch (&optional arg)
  "Export dispatcher for Org mode.

It provides an access to common export related tasks in a buffer.
Its interface comes in two flavours: standard and expert.  While
both share the same set of bindings, only the former displays the
valid keys associations.  Set `org-export-dispatch-use-expert-ui'
to switch to one or the other.

When ARG is \\[universal-argument], repeat the last export action, with the same set
of options used back then, on the current buffer.

When ARG is \\[universal-argument] \\[universal-argument], display the asynchronous export stack
directly."
  (interactive "P")
  (let* ((input
	  (cond ((equal arg '(16)) '(stack))
		((and arg org-export-dispatch-last-action))
		(t (save-window-excursion
		     (unwind-protect
			 ;; Store this export command.
			 (setq org-export-dispatch-last-action
			       (org-export-dispatch-ui
				(list org-export-initial-scope
				      (and org-export-in-background 'async))
				nil
				org-export-dispatch-use-expert-ui))
		       (and (get-buffer "*Org Export Dispatcher*")
			    (kill-buffer "*Org Export Dispatcher*")))))))
	 (action (car input))
	 (optns (cdr input)))
    (case action
      ;; First handle special hard-coded actions.
      (stack (org-export-stack))
      (publish-current-file
       (org-publish-current-file (memq 'force optns) (memq 'async optns)))
      (publish-current-project
       (org-publish-current-project (memq 'force optns) (memq 'async optns)))
      (publish-choose-project
       (org-publish (assoc (org-icompleting-read
			    "Publish project: "
			    org-publish-project-alist nil t)
			   org-publish-project-alist)
		    (memq 'force optns)
		    (memq 'async optns)))
      (publish-all (org-publish-all (memq 'force optns) (memq 'async optns)))
      (otherwise (funcall action
			  ;; Return a symbol instead of a list to ease
			  ;; asynchronous export macro use.
			  (and (memq 'async optns) t)
			  (and (memq 'subtree optns) t)
			  (and (memq 'visible optns) t)
			  (and (memq 'body optns) t))))))

(defun org-export-dispatch-ui (options first-key expertp)
  "Handle interface for `org-export-dispatch'.

OPTIONS is a list containing current interactive options set for
export.  It can contain any of the following symbols:
`body'    toggles a body-only export
`subtree' restricts export to current subtree
`visible' restricts export to visible part of buffer.
`force'   force publishing files.
`async'   use asynchronous export process

FIRST-KEY is the key pressed to select the first level menu.  It
is nil when this menu hasn't been selected yet.

EXPERTP, when non-nil, triggers expert UI.  In that case, no help
buffer is provided, but indications about currently active
options are given in the prompt.  Moreover, \[?] allows to switch
back to standard interface."
  (let* ((fontify-key
	  (lambda (key &optional access-key)
	    ;; Fontify KEY string.  Optional argument ACCESS-KEY, when
	    ;; non-nil is the required first-level key to activate
	    ;; KEY.  When its value is t, activate KEY independently
	    ;; on the first key, if any.  A nil value means KEY will
	    ;; only be activated at first level.
	    (if (or (eq access-key t) (eq access-key first-key))
		(org-propertize key 'face 'org-warning)
	      key)))
	 (fontify-value
	  (lambda (value)
	    ;; Fontify VALUE string.
	    (org-propertize value 'face 'font-lock-variable-name-face)))
	 ;; Prepare menu entries by extracting them from
	 ;; `org-export-registered-backends', and sorting them by
	 ;; access key and by ordinal, if any.
	 (backends
	  (sort
	   (sort
	    (delq nil
		  (mapcar
		   (lambda (b)
		     (let ((name (car b)))
		       (catch 'ignored
			 ;; Ignore any back-end belonging to
			 ;; `org-export-invisible-backends' or derived
			 ;; from one of them.
			 (dolist (ignored org-export-invisible-backends)
			   (when (org-export-derived-backend-p name ignored)
			     (throw 'ignored nil)))
			 (org-export-backend-menu name))))
		   org-export-registered-backends))
	    (lambda (a b)
	      (let ((key-a (nth 1 a))
		    (key-b (nth 1 b)))
		(cond ((and (numberp key-a) (numberp key-b))
		       (< key-a key-b))
		      ((numberp key-b) t)))))
	   (lambda (a b) (< (car a) (car b)))))
	 ;; Compute a list of allowed keys based on the first key
	 ;; pressed, if any.  Some keys (?^B, ?^V, ?^S, ?^F, ?^A
	 ;; and ?q) are always available.
	 (allowed-keys
	  (nconc (list ? ? ? ? ?)
		 (if (not first-key) (org-uniquify (mapcar 'car backends))
		   (let (sub-menu)
		     (dolist (backend backends (sort (mapcar 'car sub-menu) '<))
		       (when (eq (car backend) first-key)
			 (setq sub-menu (append (nth 2 backend) sub-menu))))))
		 (cond ((eq first-key ?P) (list ?f ?p ?x ?a))
		       ((not first-key) (list ?P)))
		 (list ?&)
		 (when expertp (list ??))
		 (list ?q)))
	 ;; Build the help menu for standard UI.
	 (help
	  (unless expertp
	    (concat
	     ;; Options are hard-coded.
	     (format "Options
    [%s] Body only:    %s       [%s] Visible only:     %s
    [%s] Export scope: %s   [%s] Force publishing: %s
    [%s] Async export: %s\n"
		     (funcall fontify-key "C-b" t)
		     (funcall fontify-value
			      (if (memq 'body options) "On " "Off"))
		     (funcall fontify-key "C-v" t)
		     (funcall fontify-value
			      (if (memq 'visible options) "On " "Off"))
		     (funcall fontify-key "C-s" t)
		     (funcall fontify-value
			      (if (memq 'subtree options) "Subtree" "Buffer "))
		     (funcall fontify-key "C-f" t)
		     (funcall fontify-value
			      (if (memq 'force options) "On " "Off"))
		     (funcall fontify-key "C-a" t)
		     (funcall fontify-value
			      (if (memq 'async options) "On " "Off")))
	     ;; Display registered back-end entries.  When a key
	     ;; appears for the second time, do not create another
	     ;; entry, but append its sub-menu to existing menu.
	     (let (last-key)
	       (mapconcat
		(lambda (entry)
		  (let ((top-key (car entry)))
		    (concat
		     (unless (eq top-key last-key)
		       (setq last-key top-key)
		       (format "\n[%s] %s\n"
			       (funcall fontify-key (char-to-string top-key))
			       (nth 1 entry)))
		     (let ((sub-menu (nth 2 entry)))
		       (unless (functionp sub-menu)
			 ;; Split sub-menu into two columns.
			 (let ((index -1))
			   (concat
			    (mapconcat
			     (lambda (sub-entry)
			       (incf index)
			       (format
				(if (zerop (mod index 2)) "    [%s] %-24s"
				  "[%s] %s\n")
				(funcall fontify-key
					 (char-to-string (car sub-entry))
					 top-key)
				(nth 1 sub-entry)))
			     sub-menu "")
			    (when (zerop (mod index 2)) "\n"))))))))
		backends ""))
	     ;; Publishing menu is hard-coded.
	     (format "\n[%s] Publish
    [%s] Current file            [%s] Current project
    [%s] Choose project          [%s] All projects\n\n"
		     (funcall fontify-key "P")
		     (funcall fontify-key "f" ?P)
		     (funcall fontify-key "p" ?P)
		     (funcall fontify-key "x" ?P)
		     (funcall fontify-key "a" ?P))
	     (format "\[%s] Export stack\n" (funcall fontify-key "&" t))
	     (format "\[%s] %s"
		     (funcall fontify-key "q" t)
		     (if first-key "Main menu" "Exit")))))
	 ;; Build prompts for both standard and expert UI.
	 (standard-prompt (unless expertp "Export command: "))
	 (expert-prompt
	  (when expertp
	    (format
	     "Export command (C-%s%s%s%s%s) [%s]: "
	     (if (memq 'body options) (funcall fontify-key "b" t) "b")
	     (if (memq 'visible options) (funcall fontify-key "v" t) "v")
	     (if (memq 'subtree options) (funcall fontify-key "s" t) "s")
	     (if (memq 'force options) (funcall fontify-key "f" t) "f")
	     (if (memq 'async options) (funcall fontify-key "a" t) "a")
	     (mapconcat (lambda (k)
			  ;; Strip control characters.
			  (unless (< k 27) (char-to-string k)))
			allowed-keys "")))))
    ;; With expert UI, just read key with a fancy prompt.  In standard
    ;; UI, display an intrusive help buffer.
    (if expertp
	(org-export-dispatch-action
	 expert-prompt allowed-keys backends options first-key expertp)
      ;; At first call, create frame layout in order to display menu.
      (unless (get-buffer "*Org Export Dispatcher*")
	(delete-other-windows)
	(org-switch-to-buffer-other-window
	 (get-buffer-create "*Org Export Dispatcher*"))
	(setq cursor-type nil))
      ;; At this point, the buffer containing the menu exists and is
      ;; visible in the current window.  So, refresh it.
      (with-current-buffer "*Org Export Dispatcher*"
	(erase-buffer)
	(insert help))
      (org-fit-window-to-buffer)
      (org-export-dispatch-action
       standard-prompt allowed-keys backends options first-key expertp))))

(defun org-export-dispatch-action
  (prompt allowed-keys backends options first-key expertp)
  "Read a character from command input and act accordingly.

PROMPT is the displayed prompt, as a string.  ALLOWED-KEYS is
a list of characters available at a given step in the process.
BACKENDS is a list of menu entries.  OPTIONS, FIRST-KEY and
EXPERTP are the same as defined in `org-export-dispatch-ui',
which see.

Toggle export options when required.  Otherwise, return value is
a list with action as CAR and a list of interactive export
options as CDR."
  (let ((key (read-char-exclusive prompt)))
    (cond
     ;; Ignore undefined associations.
     ((not (memq key allowed-keys))
      (ding)
      (unless expertp (message "Invalid key") (sit-for 1))
      (org-export-dispatch-ui options first-key expertp))
     ;; q key at first level aborts export.  At second
     ;; level, cancel first key instead.
     ((eq key ?q) (if (not first-key) (error "Export aborted")
		    (org-export-dispatch-ui options nil expertp)))
     ;; Help key: Switch back to standard interface if
     ;; expert UI was active.
     ((eq key ??) (org-export-dispatch-ui options first-key nil))
     ;; Switch to asynchronous export stack.
     ((eq key ?&) '(stack))
     ;; Toggle export options.
     ((memq key '(? ? ? ? ?))
      (org-export-dispatch-ui
       (let ((option (case key (? 'body) (? 'visible) (? 'subtree)
			   (? 'force) (? 'async))))
	 (if (memq option options) (remq option options)
	   (cons option options)))
       first-key expertp))
     ;; Action selected: Send key and options back to
     ;; `org-export-dispatch'.
     ((or first-key (functionp (nth 2 (assq key backends))))
      (cons (cond
	     ((not first-key) (nth 2 (assq key backends)))
	     ;; Publishing actions are hard-coded.  Send a special
	     ;; signal to `org-export-dispatch'.
	     ((eq first-key ?P)
	      (case key
		(?f 'publish-current-file)
		(?p 'publish-current-project)
		(?x 'publish-choose-project)
		(?a 'publish-all)))
	     ;; Return first action associated to FIRST-KEY + KEY
	     ;; path. Indeed, derived backends can share the same
	     ;; FIRST-KEY.
	     (t (catch 'found
		  (mapc (lambda (backend)
			  (let ((match (assq key (nth 2 backend))))
			    (when match (throw 'found (nth 2 match)))))
			(member (assq first-key backends) backends)))))
	    options))
     ;; Otherwise, enter sub-menu.
     (t (org-export-dispatch-ui options key expertp)))))


(provide 'ox)

;; Local variables:
;; generated-autoload-file: "org-loaddefs.el"
;; End:

;;; ox.el ends here