Docstrings from 'ox.el'

(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.")

(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.")

(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 a headline property setting the
  ;; same property in communication channel. The name for the property
  ;; is the keyword with "EXPORT_")

(defun org-export--get-inbuffer-options (&optional backend)
  "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.

Assume buffer is in Org mode.  Narrowing, if any, is ignored.")

(defun org-export--get-buffer-attributes ()
  "Return properties related to buffer attributes, as a plist.")

(defvar org-export--default-title nil)  ; Dynamically scoped.
(defun org-export-store-default-title ()
  "Return default title for current document, as a string.
Title is extracted from associated file name, if any, or buffer's
name.")

(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.")

(defun org-export--list-bound-variables ()
  "Return variables bound from BIND keywords in current buffer.
Also look for BIND keywords in setup files.  The return value is
an alist where associations are (VARIABLE-NAME VALUE).")

(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 a 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.")

(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.")

(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 a headline and value is its
associated numbering \(in the shape of a list of numbers\) or nil
for a footnotes section.")

(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.")

(defun org-export--selected-trees (data info)
  "Return list of headlines and inlinetasks with a select tag in their tree.
DATA is parsed data as returned by `org-element-parse-buffer'.
INFO is a plist holding export options.")

(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 or inlinetasks belonging to
a tree with a select tag.")

(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.")

(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.")

(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.")

(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-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.")

(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.")

(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.")

(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.

All values will become strings except the empty string and
\"nil\", which will become nil.  Also, values containing only
double quotes will be read as-is, which means that \"\" value
will become the empty string.")

(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.")

(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..")

(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.")

(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.")

(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.")

(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.")

(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.")

(defun org-export-get-relative-level (headline info)
  "Return HEADLINE relative level within current parsed tree.
INFO is a plist holding contextual information.")

(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.")

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

(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.")

(defun org-export-number-to-roman (n)
  "Convert integer N into a roman numeral.")

(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.")

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

PROPERTY is an upcase 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.")

(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 \"???\".")

(defun org-export-get-alt-title (headline info)
  "Return alternative title for HEADLINE, as a secondary string.
INFO is a plist used as a communication channel.  If no optional
title is defined, fall-back to the regular title.")

(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.")

(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.")

(defun org-export-get-date (info &optional fmt)
  "Return date value for the current document.

INFO is a plist used as a communication channel.  FMT, when
non-nil, is a time format string that will be applied on the date
if it consists in a single timestamp object.  It defaults to
`org-export-date-timestamp-format' when nil.

A proper date can be a secondary string, a string or nil.  It is
meant to be translated with `org-export-data' or alike.")

(defun org-export-solidify-link-text (s)
  "Take link text S and make a safe target out of it.")

(defun org-export-get-coderef-format (path desc)
  "Return format string for code reference link.
PATH is the link path.  DESC is its description.")

(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.")

(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.")

(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>>) 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\".  White spaces are not
significant.")

(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\".")

(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\".")

(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 a 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.")

(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.")

(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).")

(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.")

(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.")

(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 "^")

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

INFO is a plist used as a communication channel.

A table has a header when it contains at least two row groups.")

(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.")

(defun org-export-table-row-group (table-row info)
  "Return TABLE-ROW's group number, as an integer.

INFO is a plist used as the communication channel.

Return value is the group number, as an integer, or nil for
special rows and rows separators.  First group is also table's
header.")

(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.")

(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'.")

(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.")

(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.")

(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.")

(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.")

(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.")

(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.")

(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.")

(defun org-export-table-row-number (table-row info)
  "Return TABLE-ROW number.
INFO is a plist used as a communication channel.  Return value is
zero-based and ignores separators.  The function returns nil for
special colums and separators.")

(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).")

(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.")

(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.")

(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.
Footnote sections, if any, will be ignored.")

(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.")

(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.")

(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.")

(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.")

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

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

(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.")

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

(defun org-export-get-parent-element (object)
  "Return first element containing OBJECT or nil.
OBJECT is the object to consider.")

(defun org-export-get-parent-table (object)
  "Return OBJECT parent table or nil.
OBJECT is either a `table-cell' or `table-element' type object.")

(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 farthest to
closest.  With any other non-nil value, return a list containing
all of them.")

(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.")

(defconst org-export-dictionary
  '(("Author"
     ("ca" :default "Autor")
     ("cs" :default "Autor")
     ("da" :default "Ophavsmand")
     ("de" :default "Autor")
     ("eo" :html "Aŭtoro")
     ("es" :default "Autor")
     ("fi" :html "Tekijä")
     ("fr" :default "Auteur")
     ("hu" :default "Szerzõ")
     ("is" :html "Höfundur")
     ("it" :default "Autore")
     ("ja" :html "著者" :utf-8 "著者")
     ("nl" :default "Auteur")
     ("no" :default "Forfatter")
     ("nb" :default "Forfatter")
     ("nn" :default "Forfattar")
     ("pl" :default "Autor")
     ("ru" :html "Автор" :utf-8 "Автор")
     ("sv" :html "Författare")
     ("uk" :html "Автор" :utf-8 "Автор")
     ("zh-CN" :html "作者" :utf-8 "作者")
     ("zh-TW" :html "作者" :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 "Päivämäärä")
     ("hu" :html "Dátum")
     ("is" :default "Dagsetning")
     ("it" :default "Data")
     ("ja" :html "日付" :utf-8 "日付")
     ("nl" :default "Datum")
     ("no" :default "Dato")
     ("nb" :default "Dato")
     ("nn" :default "Dato")
     ("pl" :default "Data")
     ("ru" :html "Дата" :utf-8 "Дата")
     ("sv" :default "Datum")
     ("uk" :html "Дата" :utf-8 "Дата")
     ("zh-CN" :html "日期" :utf-8 "日期")
     ("zh-TW" :html "日期" :utf-8 "日期"))
    ("Equation"
     ("fr" :ascii "Equation" :default "Équation"))
    ("Figure")
    ("Footnotes"
     ("ca" :html "Peus de pàgina")
     ("cs" :default "Pozn\xe1mky pod carou")
     ("da" :default "Fodnoter")
     ("de" :html "Fußnoten")
     ("eo" :default "Piednotoj")
     ("es" :html "Pies de página")
     ("fi" :default "Alaviitteet")
     ("fr" :default "Notes de bas de page")
     ("hu" :html "Lábjegyzet")
     ("is" :html "Aftanmálsgreinar")
     ("it" :html "Note a piè di pagina")
     ("ja" :html "脚注" :utf-8 "脚注")
     ("nl" :default "Voetnoten")
     ("no" :default "Fotnoter")
     ("nb" :default "Fotnoter")
     ("nn" :default "Fotnotar")
     ("pl" :default "Przypis")
     ("ru" :html "Сноски" :utf-8 "Сноски")
     ("sv" :default "Fotnoter")
     ("uk" :html "Примітки"
      :utf-8 "Примітки")
     ("zh-CN" :html "脚注" :utf-8 "脚注")
     ("zh-TW" :html "腳註" :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 "Índex")
     ("cs" :default "Obsah")
     ("da" :default "Indhold")
     ("de" :default "Inhaltsverzeichnis")
     ("eo" :default "Enhavo")
     ("es" :html "Índice")
     ("fi" :html "Sisällysluettelo")
     ("fr" :ascii "Sommaire" :default "Table des matières")
     ("hu" :html "Tartalomjegyzék")
     ("is" :default "Efnisyfirlit")
     ("it" :default "Indice")
     ("ja" :html "目次" :utf-8 "目次")
     ("nl" :default "Inhoudsopgave")
     ("no" :default "Innhold")
     ("nb" :default "Innhold")
     ("nn" :default "Innhald")
     ("pl" :html "Spis treści")
     ("ru" :html "Содержание"
      :utf-8 "Содержание")
     ("sv" :html "Innehåll")
     ("uk" :html "Зміст" :utf-8 "Зміст")
     ("zh-CN" :html "目录" :utf-8 "目录")
     ("zh-TW" :html "目錄" :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.")