org-mode/contrib/lisp/org-element.el

;;; org-element.el --- Parser And Applications for Org syntax

;; Copyright (C) 2012  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.

;; This file is not part of GNU Emacs.

;; 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:

;; Org syntax can be divided into three categories: "Greater
;; elements", "Elements" and "Objects".

;; Elements are related to the structure of the document.  Indeed, all
;; elements are a cover for the document: each position within belongs
;; to at least one element.

;; An element always starts and ends at the beginning of a line.  With
;; a few exceptions (namely `babel-call', `clock', `headline', `item',
;; `keyword', `planning', `property-drawer' and `section' types), it
;; can also accept a fixed set of keywords as attributes.  Those are
;; called "affiliated keywords" to distinguish them from other
;; keywords, which are full-fledged elements.  All affiliated keywords
;; are referenced in `org-element-affiliated-keywords'.
;;
;; Element containing other elements (and only elements) are called
;; greater elements.  Concerned types are: `center-block', `drawer',
;; `dynamic-block', `footnote-definition', `headline', `inlinetask',
;; `item', `plain-list', `quote-block', `section' and `special-block'.
;;
;; Other element types are: `babel-call', `clock', `comment',
;; `comment-block', `example-block', `export-block', `fixed-width',
;; `horizontal-rule', `keyword', `latex-environment', `paragraph',
;; `planning', `property-drawer', `quote-section', `src-block',
;; `table', `table-row' and `verse-block'.  Among them, `paragraph'
;; and `verse-block' types can contain Org objects and plain text.
;;
;; Objects are related to document's contents.  Some of them are
;; recursive.  Associated types are of the following: `bold', `code',
;; `entity', `export-snippet', `footnote-reference',
;; `inline-babel-call', `inline-src-block', `italic',
;; `latex-fragment', `line-break', `link', `macro', `radio-target',
;; `statistics-cookie', `strike-through', `subscript', `superscript',
;; `table-cell', `target', `timestamp', `underline' and `verbatim'.
;;
;; Some elements also have special properties whose value can hold
;; objects themselves (i.e. an item tag or an headline name).  Such
;; values are called "secondary strings".  Any object belongs to
;; either an element or a secondary string.
;;
;; Notwithstanding affiliated keywords, each greater element, element
;; and object has a fixed set of properties attached to it.  Among
;; them, three are shared by all types: `:begin' and `:end', which
;; refer to the beginning and ending buffer positions of the
;; considered element or object, and `:post-blank', which holds the
;; number of blank lines, or white spaces, at its end.  Greater
;; elements and elements containing objects will also have
;; `:contents-begin' and `:contents-end' properties to delimit
;; contents.

;; Lisp-wise, an element or an object can be represented as a list.
;; It follows the pattern (TYPE PROPERTIES CONTENTS), where:
;;   TYPE is a symbol describing the Org element or object.
;;   PROPERTIES is the property list attached to it.  See docstring of
;;              appropriate parsing function to get an exhaustive
;;              list.
;;   CONTENTS is a list of elements, objects or raw strings contained
;;            in the current element or object, when applicable.

;; An Org buffer is a nested list of such elements and objects, whose
;; type is `org-data' and properties is nil.

;; The first part of this file implements a parser and an interpreter
;; for each type of Org syntax.

;; The next two parts introduce four accessors and a function
;; retrieving the element starting at point (respectively
;; `org-element-type', `org-element-property', `org-element-contents',
;; `org-element-restriction' and `org-element-current-element').

;; The following part creates a fully recursive buffer parser.  It
;; also provides a tool to map a function to elements or objects
;; matching some criteria in the parse tree.  Functions of interest
;; are `org-element-parse-buffer', `org-element-map' and, to a lesser
;; extent, `org-element-parse-secondary-string'.

;; The penultimate part is the cradle of an interpreter for the
;; obtained parse tree: `org-element-interpret-data'.

;; The library ends by furnishing a set of interactive tools for
;; element's navigation and manipulation, mostly based on
;; `org-element-at-point' function.


;;; Code:

(eval-when-compile (require 'cl))
(require 'org)
(declare-function org-inlinetask-goto-end "org-inlinetask" ())


;;; Greater elements

;; For each greater element type, we define a parser and an
;; interpreter.

;; A parser returns the element or object as the list described above.
;; Most of them accepts no argument.  Though, exceptions exist.  Hence
;; every element containing a secondary string (see
;; `org-element-secondary-value-alist') will accept an optional
;; argument to toggle parsing of that secondary string.  Moreover,
;; `item' parser requires current list's structure as its first
;; element.

;; An interpreter accepts two arguments: the list representation of
;; the element or object, and its contents.  The latter may be nil,
;; depending on the element or object considered.  It returns the
;; appropriate Org syntax, as a string.

;; Parsing functions must follow the naming convention:
;; org-element-TYPE-parser, where TYPE is greater element's type, as
;; defined in `org-element-greater-elements'.
;;
;; Similarly, interpreting functions must follow the naming
;; convention: org-element-TYPE-interpreter.

;; With the exception of `headline' and `item' types, greater elements
;; cannot contain other greater elements of their own type.

;; Beside implementing a parser and an interpreter, adding a new
;; greater element requires to tweak `org-element-current-element'.
;; Moreover, the newly defined type must be added to both
;; `org-element-all-elements' and `org-element-greater-elements'.


;;;; Center Block

(defun org-element-center-block-parser ()
  "Parse a center block.

Return a list whose CAR is `center-block' and CDR is a plist
containing `:begin', `:end', `:hiddenp', `:contents-begin',
`:contents-end' and `:post-blank' keywords.

Assume point is at the beginning of the block."
  (save-excursion
    (let* ((case-fold-search t)
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end
	    (progn (re-search-forward "^[ \t]*#\\+END_CENTER" nil t)
		   (point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(center-block
	(:begin ,begin
		:end ,end
		:hiddenp ,hidden
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-center-block-interpreter (center-block contents)
  "Interpret CENTER-BLOCK element as Org syntax.
CONTENTS is the contents of the element."
  (format "#+BEGIN_CENTER\n%s#+END_CENTER" contents))


;;;; Drawer

(defun org-element-drawer-parser ()
  "Parse a drawer.

Return a list whose CAR is `drawer' and CDR is a plist containing
`:drawer-name', `:begin', `:end', `:hiddenp', `:contents-begin',
`:contents-end' and `:post-blank' keywords.

Assume point is at beginning of drawer."
  (save-excursion
    (let* ((case-fold-search t)
	   (name (progn (looking-at org-drawer-regexp)
			(org-match-string-no-properties 1)))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end (progn (re-search-forward "^[ \t]*:END:" nil t)
				(point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(drawer
	(:begin ,begin
		:end ,end
		:drawer-name ,name
		:hiddenp ,hidden
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-drawer-interpreter (drawer contents)
  "Interpret DRAWER element as Org syntax.
CONTENTS is the contents of the element."
  (format ":%s:\n%s:END:"
	  (org-element-property :drawer-name drawer)
	  contents))


;;;; Dynamic Block

(defun org-element-dynamic-block-parser ()
  "Parse a dynamic block.

Return a list whose CAR is `dynamic-block' and CDR is a plist
containing `:block-name', `:begin', `:end', `:hiddenp',
`:contents-begin', `:contents-end', `:arguments' and
`:post-blank' keywords.

Assume point is at beginning of dynamic block."
  (save-excursion
    (let* ((case-fold-search t)
	   (name (progn (looking-at org-dblock-start-re)
			(org-match-string-no-properties 1)))
	   (arguments (org-match-string-no-properties 3))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end (progn (re-search-forward org-dblock-end-re nil t)
				(point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      (list 'dynamic-block
	    `(:begin ,begin
		     :end ,end
		     :block-name ,name
		     :arguments ,arguments
		     :hiddenp ,hidden
		     :contents-begin ,contents-begin
		     :contents-end ,contents-end
		     :post-blank ,(count-lines pos-before-blank end)
		     ,@(cadr keywords))))))

(defun org-element-dynamic-block-interpreter (dynamic-block contents)
  "Interpret DYNAMIC-BLOCK element as Org syntax.
CONTENTS is the contents of the element."
  (format "#+BEGIN: %s%s\n%s#+END:"
	  (org-element-property :block-name dynamic-block)
	  (let ((args (org-element-property :arguments dynamic-block)))
	    (and args (concat " " args)))
	  contents))


;;;; Footnote Definition

(defun org-element-footnote-definition-parser ()
  "Parse a footnote definition.

Return a list whose CAR is `footnote-definition' and CDR is
a plist containing `:label', `:begin' `:end', `:contents-begin',
`:contents-end' and `:post-blank' keywords.

Assume point is at the beginning of the footnote definition."
  (save-excursion
    (looking-at org-footnote-definition-re)
    (let* ((label (org-match-string-no-properties 1))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (search-forward "]")
				  (org-skip-whitespace)
				  (point)))
	   (contents-end (if (progn
			       (end-of-line)
			       (re-search-forward
				(concat org-outline-regexp-bol "\\|"
					org-footnote-definition-re "\\|"
					"^[ \t]*$") nil t))
			     (match-beginning 0)
			   (point-max)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(footnote-definition
	(:label ,label
		:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,(count-lines contents-end end)
		,@(cadr keywords))))))

(defun org-element-footnote-definition-interpreter (footnote-definition contents)
  "Interpret FOOTNOTE-DEFINITION element as Org syntax.
CONTENTS is the contents of the footnote-definition."
  (concat (format "[%s]" (org-element-property :label footnote-definition))
	  " "
	  contents))


;;;; Headline

(defun org-element-headline-parser (&optional raw-secondary-p)
  "Parse an headline.

Return a list whose CAR is `headline' and CDR is a plist
containing `:raw-value', `:title', `:begin', `:end',
`:pre-blank', `:hiddenp', `:contents-begin' and `:contents-end',
`:level', `:priority', `:tags', `:todo-keyword',`:todo-type',
`:scheduled', `:deadline', `:timestamp', `:clock', `:category',
`:quotedp', `:archivedp', `:commentedp' and `:footnote-section-p'
keywords.

The plist also contains any property set in the property drawer,
with its name in lowercase, the underscores replaced with hyphens
and colons at the beginning (i.e. `:custom-id').

When RAW-SECONDARY-P is non-nil, headline's title will not be
parsed as a secondary string, but as a plain string instead.

Assume point is at beginning of the headline."
  (save-excursion
    (let* ((components (org-heading-components))
	   (level (nth 1 components))
	   (todo (nth 2 components))
	   (todo-type
	    (and todo (if (member todo org-done-keywords) 'done 'todo)))
	   (tags (let ((raw-tags (nth 5 components)))
		   (and raw-tags (org-split-string raw-tags ":"))))
	   (raw-value (nth 4 components))
	   (quotedp
	    (let ((case-fold-search nil))
	      (string-match (format "^%s +" org-quote-string) raw-value)))
	   (commentedp
	    (let ((case-fold-search nil))
	      (string-match (format "^%s +" org-comment-string) raw-value)))
	   (archivedp (member org-archive-tag tags))
	   (footnote-section-p (and org-footnote-section
				    (string= org-footnote-section raw-value)))
	   (standard-props (let (plist)
			     (mapc
			      (lambda (p)
				(let ((p-name (downcase (car p))))
				  (while (string-match "_" p-name)
				    (setq p-name
					  (replace-match "-" nil nil p-name)))
				  (setq p-name (intern (concat ":" p-name)))
				  (setq plist
					(plist-put plist p-name (cdr p)))))
			      (org-entry-properties nil 'standard))
			     plist))
	   (time-props (org-entry-properties nil 'special "CLOCK"))
	   (scheduled (cdr (assoc "SCHEDULED" time-props)))
	   (deadline (cdr (assoc "DEADLINE" time-props)))
	   (clock (cdr (assoc "CLOCK" time-props)))
	   (timestamp (cdr (assoc "TIMESTAMP" time-props)))
	   (begin (point))
	   (pos-after-head (save-excursion (forward-line) (point)))
	   (contents-begin (save-excursion (forward-line)
					   (org-skip-whitespace)
					   (if (eobp) (point) (point-at-bol))))
	   (hidden (save-excursion (forward-line) (org-truely-invisible-p)))
	   (end (progn (goto-char (org-end-of-subtree t t))))
	   (contents-end (progn (skip-chars-backward " \r\t\n")
				(forward-line)
				(point)))
	   title)
      ;; Clean RAW-VALUE from any quote or comment string.
      (when (or quotedp commentedp)
	(setq raw-value
	      (replace-regexp-in-string
	       (concat "\\(" org-quote-string "\\|" org-comment-string "\\) +")
	       ""
	       raw-value)))
      ;; Clean TAGS from archive tag, if any.
      (when archivedp (setq tags (delete org-archive-tag tags)))
      ;; Then get TITLE.
      (setq title
	    (if raw-secondary-p raw-value
	      (org-element-parse-secondary-string
	       raw-value (org-element-restriction 'headline))))
      `(headline
	(:raw-value ,raw-value
		    :title ,title
		    :begin ,begin
		    :end ,end
		    :pre-blank ,(count-lines pos-after-head contents-begin)
		    :hiddenp ,hidden
		    :contents-begin ,contents-begin
		    :contents-end ,contents-end
		    :level ,level
		    :priority ,(nth 3 components)
		    :tags ,tags
		    :todo-keyword ,todo
		    :todo-type ,todo-type
		    :scheduled ,scheduled
		    :deadline ,deadline
		    :timestamp ,timestamp
		    :clock ,clock
		    :post-blank ,(count-lines contents-end end)
		    :footnote-section-p ,footnote-section-p
		    :archivedp ,archivedp
		    :commentedp ,commentedp
		    :quotedp ,quotedp
		    ,@standard-props)))))

(defun org-element-headline-interpreter (headline contents)
  "Interpret HEADLINE element as Org syntax.
CONTENTS is the contents of the element."
  (let* ((level (org-element-property :level headline))
	 (todo (org-element-property :todo-keyword headline))
	 (priority (org-element-property :priority headline))
	 (title (org-element-interpret-data
		 (org-element-property :title headline)))
	 (tags (let ((tag-list (if (org-element-property :archivedp headline)
				   (cons org-archive-tag
					 (org-element-property :tags headline))
				 (org-element-property :tags headline))))
		 (and tag-list
		      (format ":%s:" (mapconcat 'identity tag-list ":")))))
	 (commentedp (org-element-property :commentedp headline))
	 (quotedp (org-element-property :quotedp headline))
	 (pre-blank (or (org-element-property :pre-blank headline) 0))
	 (heading (concat (make-string level ?*)
			  (and todo (concat " " todo))
			  (and quotedp (concat " " org-quote-string))
			  (and commentedp (concat " " org-comment-string))
			  (and priority
			       (format " [#%s]" (char-to-string priority)))
			  (cond ((and org-footnote-section
				      (org-element-property
				       :footnote-section-p headline))
				 (concat " " org-footnote-section))
				(title (concat " " title))))))
    (concat heading
	    ;; Align tags.
	    (when tags
	      (cond
	       ((zerop org-tags-column) (format " %s" tags))
	       ((< org-tags-column 0)
		(concat
		 (make-string
		  (max (- (+ org-tags-column (length heading) (length tags))) 1)
		  ? )
		 tags))
	       (t
		(concat
		 (make-string (max (- org-tags-column (length heading)) 1) ? )
		 tags))))
	    (make-string (1+ pre-blank) 10)
	    contents)))


;;;; Inlinetask

(defun org-element-inlinetask-parser (&optional raw-secondary-p)
  "Parse an inline task.

Return a list whose CAR is `inlinetask' and CDR is a plist
containing `:title', `:begin', `:end', `:hiddenp',
`:contents-begin' and `:contents-end', `:level', `:priority',
`:tags', `:todo-keyword', `:todo-type', `:scheduled',
`:deadline', `:timestamp', `:clock' and `:post-blank' keywords.

The plist also contains any property set in the property drawer,
with its name in lowercase, the underscores replaced with hyphens
and colons at the beginning (i.e. `:custom-id').

When optional argument RAW-SECONDARY-P is non-nil, inline-task's
title will not be parsed as a secondary string, but as a plain
string instead.

Assume point is at beginning of the inline task."
  (save-excursion
    (let* ((keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (components (org-heading-components))
	   (todo (nth 2 components))
	   (todo-type (and todo
			   (if (member todo org-done-keywords) 'done 'todo)))
	   (tags (let ((raw-tags (nth 5 components)))
		   (and raw-tags (org-split-string raw-tags ":"))))
	   (title (if raw-secondary-p (nth 4 components)
		    (org-element-parse-secondary-string
		     (nth 4 components)
		     (org-element-restriction 'inlinetask))))
	   (standard-props (let (plist)
			     (mapc
			      (lambda (p)
				(let ((p-name (downcase (car p))))
				  (while (string-match "_" p-name)
				    (setq p-name
					  (replace-match "-" nil nil p-name)))
				  (setq p-name (intern (concat ":" p-name)))
				  (setq plist
					(plist-put plist p-name (cdr p)))))
			      (org-entry-properties nil 'standard))
			     plist))
	   (time-props (org-entry-properties nil 'special "CLOCK"))
	   (scheduled (cdr (assoc "SCHEDULED" time-props)))
	   (deadline (cdr (assoc "DEADLINE" time-props)))
	   (clock (cdr (assoc "CLOCK" time-props)))
	   (timestamp (cdr (assoc "TIMESTAMP" time-props)))
	   (contents-begin (save-excursion (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (pos-before-blank (org-inlinetask-goto-end))
	   ;; In the case of a single line task, CONTENTS-BEGIN and
	   ;; CONTENTS-END might overlap.
	   (contents-end (max contents-begin
			      (if (not (bolp)) (point-at-bol)
				(save-excursion (forward-line -1) (point)))))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(inlinetask
	(:title ,title
		:begin ,begin
		:end ,end
		:hiddenp ,(and (> contents-end contents-begin) hidden)
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:level ,(nth 1 components)
		:priority ,(nth 3 components)
		:tags ,tags
		:todo-keyword ,todo
		:todo-type ,todo-type
		:scheduled ,scheduled
		:deadline ,deadline
		:timestamp ,timestamp
		:clock ,clock
		:post-blank ,(count-lines pos-before-blank end)
		,@standard-props
		,@(cadr keywords))))))

(defun org-element-inlinetask-interpreter (inlinetask contents)
  "Interpret INLINETASK element as Org syntax.
CONTENTS is the contents of inlinetask."
  (let* ((level (org-element-property :level inlinetask))
	 (todo (org-element-property :todo-keyword inlinetask))
	 (priority (org-element-property :priority inlinetask))
	 (title (org-element-interpret-data
		 (org-element-property :title inlinetask)))
	 (tags (let ((tag-list (org-element-property :tags inlinetask)))
		 (and tag-list
		      (format ":%s:" (mapconcat 'identity tag-list ":")))))
	 (task (concat (make-string level ?*)
		       (and todo (concat " " todo))
		       (and priority
			    (format " [#%s]" (char-to-string priority)))
		       (and title (concat " " title)))))
    (concat task
	    ;; Align tags.
	    (when tags
	      (cond
	       ((zerop org-tags-column) (format " %s" tags))
	       ((< org-tags-column 0)
		(concat
		 (make-string
		  (max (- (+ org-tags-column (length task) (length tags))) 1)
		  ? )
		 tags))
	       (t
		(concat
		 (make-string (max (- org-tags-column (length task)) 1) ? )
		 tags))))
	    ;; Prefer degenerate inlinetasks when there are no
	    ;; contents.
	    (when contents
	      (concat "\n"
		      contents
		      (make-string level ?*) " END")))))


;;;; Item

(defun org-element-item-parser (struct &optional raw-secondary-p)
  "Parse an item.

STRUCT is the structure of the plain list.

Return a list whose CAR is `item' and CDR is a plist containing
`:bullet', `:begin', `:end', `:contents-begin', `:contents-end',
`:checkbox', `:counter', `:tag', `:structure', `:hiddenp' and
`:post-blank' keywords.

When optional argument RAW-SECONDARY-P is non-nil, item's tag, if
any, will not be parsed as a secondary string, but as a plain
string instead.

Assume point is at the beginning of the item."
  (save-excursion
    (beginning-of-line)
    (let* ((begin (point))
	   (bullet (org-list-get-bullet (point) struct))
	   (checkbox (let ((box (org-list-get-checkbox begin struct)))
		       (cond ((equal "[ ]" box) 'off)
			     ((equal "[X]" box) 'on)
			     ((equal "[-]" box) 'trans))))
	   (counter (let ((c (org-list-get-counter begin struct)))
		      (cond
		       ((not c) nil)
		       ((string-match "[A-Za-z]" c)
			(- (string-to-char (upcase (match-string 0 c)))
			   64))
		       ((string-match "[0-9]+" c)
			(string-to-number (match-string 0 c))))))
	   (tag
	    (let ((raw-tag (org-list-get-tag begin struct)))
	      (and raw-tag
		   (if raw-secondary-p raw-tag
		     (org-element-parse-secondary-string
		      raw-tag (org-element-restriction 'item))))))
	   (end (org-list-get-item-end begin struct))
	   (contents-begin (progn (looking-at org-list-full-item-re)
				  (goto-char (match-end 0))
				  (org-skip-whitespace)
				  ;; If first line isn't empty,
				  ;; contents really start at the text
				  ;; after item's meta-data.
				  (if (= (point-at-bol) begin) (point)
				    (point-at-bol))))
	   (hidden (progn (forward-line)
			  (and (not (= (point) end))
			       (org-truely-invisible-p))))
	   (contents-end (progn (goto-char end)
				(skip-chars-backward " \r\t\n")
				(forward-line)
				(point))))
      `(item
	(:bullet ,bullet
		 :begin ,begin
		 :end ,end
		 ;; CONTENTS-BEGIN and CONTENTS-END may be mixed
		 ;; up in the case of an empty item separated
		 ;; from the next by a blank line.  Thus, ensure
		 ;; the former is always the smallest of two.
		 :contents-begin ,(min contents-begin contents-end)
		 :contents-end ,(max contents-begin contents-end)
		 :checkbox ,checkbox
		 :counter ,counter
		 :tag ,tag
		 :hiddenp ,hidden
		 :structure ,struct
		 :post-blank ,(count-lines contents-end end))))))

(defun org-element-item-interpreter (item contents)
  "Interpret ITEM element as Org syntax.
CONTENTS is the contents of the element."
  (let* ((bullet
	  (let* ((beg (org-element-property :begin item))
		 (struct (org-element-property :structure item))
		 (pre (org-list-prevs-alist struct))
		 (bul (org-element-property :bullet item)))
	    (org-list-bullet-string
	     (if (not (eq (org-list-get-list-type beg struct pre) 'ordered)) "-"
	       (let ((num
		      (car
		       (last
			(org-list-get-item-number
			 beg struct pre (org-list-parents-alist struct))))))
		 (format "%d%s"
			 num
			 (if (eq org-plain-list-ordered-item-terminator ?\)) ")"
			   ".")))))))
	 (checkbox (org-element-property :checkbox item))
	 (counter (org-element-property :counter item))
	 (tag (let ((tag (org-element-property :tag item)))
		(and tag (org-element-interpret-data tag))))
	 ;; Compute indentation.
	 (ind (make-string (length bullet) 32)))
    ;; Indent contents.
    (concat
     bullet
     (and counter (format "[@%d] " counter))
     (cond
      ((eq checkbox 'on) "[X] ")
      ((eq checkbox 'off) "[ ] ")
      ((eq checkbox 'trans) "[-] "))
     (and tag (format "%s :: " tag))
     (org-trim
      (replace-regexp-in-string "\\(^\\)[ \t]*\\S-" ind contents nil nil 1)))))


;;;; Plain List

(defun org-element-plain-list-parser (&optional structure)
  "Parse a plain list.

Optional argument STRUCTURE, when non-nil, is the structure of
the plain list being parsed.

Return a list whose CAR is `plain-list' and CDR is a plist
containing `:type', `:begin', `:end', `:contents-begin' and
`:contents-end', `:structure' and `:post-blank' keywords.

Assume point is at the beginning of the list."
  (save-excursion
    (let* ((struct (or structure (org-list-struct)))
	   (prevs (org-list-prevs-alist struct))
	   (parents (org-list-parents-alist struct))
	   (type (org-list-get-list-type (point) struct prevs))
	   (contents-begin (point))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-end
	    (goto-char (org-list-get-list-end (point) struct prevs)))
	   (end (save-excursion (org-skip-whitespace)
				(if (eobp) (point) (point-at-bol)))))
      ;; Blank lines below list belong to the top-level list only.
      (unless (= (org-list-get-top-point struct) contents-begin)
	(setq end (min (org-list-get-bottom-point struct)
		       (progn (org-skip-whitespace)
			      (if (eobp) (point) (point-at-bol))))))
      ;; Return value.
      `(plain-list
	(:type ,type
	       :begin ,begin
	       :end ,end
	       :contents-begin ,contents-begin
	       :contents-end ,contents-end
	       :structure ,struct
	       :post-blank ,(count-lines contents-end end)
	       ,@(cadr keywords))))))

(defun org-element-plain-list-interpreter (plain-list contents)
  "Interpret PLAIN-LIST element as Org syntax.
CONTENTS is the contents of the element."
  contents)


;;;; Quote Block

(defun org-element-quote-block-parser ()
  "Parse a quote block.

Return a list whose CAR is `quote-block' and CDR is a plist
containing `:begin', `:end', `:hiddenp', `:contents-begin',
`:contents-end' and `:post-blank' keywords.

Assume point is at the beginning of the block."
  (save-excursion
    (let* ((case-fold-search t)
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end (progn (re-search-forward "^[ \t]*#\\+END_QUOTE" nil t)
				(point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(quote-block
	(:begin ,begin
		:end ,end
		:hiddenp ,hidden
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-quote-block-interpreter (quote-block contents)
  "Interpret QUOTE-BLOCK element as Org syntax.
CONTENTS is the contents of the element."
  (format "#+BEGIN_QUOTE\n%s#+END_QUOTE" contents))


;;;; Section

(defun org-element-section-parser ()
  "Parse a section.

Return a list whose CAR is `section' and CDR is a plist
containing `:begin', `:end', `:contents-begin', `contents-end'
and `:post-blank' keywords."
  (save-excursion
    ;; Beginning of section is the beginning of the first non-blank
    ;; line after previous headline.
    (org-with-limited-levels
     (let ((begin
	    (save-excursion
	      (outline-previous-heading)
	      (if (not (org-at-heading-p)) (point)
		(forward-line) (org-skip-whitespace) (point-at-bol))))
	   (end (progn (outline-next-heading) (point)))
	   (pos-before-blank (progn (skip-chars-backward " \r\t\n")
				    (forward-line)
				    (point))))
       `(section
	 (:begin ,begin
		 :end ,end
		 :contents-begin ,begin
		 :contents-end ,pos-before-blank
		 :post-blank ,(count-lines pos-before-blank end)))))))

(defun org-element-section-interpreter (section contents)
  "Interpret SECTION element as Org syntax.
CONTENTS is the contents of the element."
  contents)


;;;; Special Block

(defun org-element-special-block-parser ()
  "Parse a special block.

Return a list whose CAR is `special-block' and CDR is a plist
containing `:type', `:begin', `:end', `:hiddenp',
`:contents-begin', `:contents-end' and `:post-blank' keywords.

Assume point is at the beginning of the block."
  (save-excursion
    (let* ((case-fold-search t)
	   (type (progn (looking-at "[ \t]*#\\+BEGIN_\\([-A-Za-z0-9]+\\)")
			(org-match-string-no-properties 1)))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end
	    (progn (re-search-forward (concat "^[ \t]*#\\+END_" type) nil t)
		   (point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(special-block
	(:type ,type
	       :begin ,begin
	       :end ,end
	       :hiddenp ,hidden
	       :contents-begin ,contents-begin
	       :contents-end ,contents-end
	       :post-blank ,(count-lines pos-before-blank end)
	       ,@(cadr keywords))))))

(defun org-element-special-block-interpreter (special-block contents)
  "Interpret SPECIAL-BLOCK element as Org syntax.
CONTENTS is the contents of the element."
  (let ((block-type (org-element-property :type special-block)))
    (format "#+BEGIN_%s\n%s#+END_%s" block-type contents block-type)))



;;; Elements

;; For each element, a parser and an interpreter are also defined.
;; Both follow the same naming convention used for greater elements.

;; Also, as for greater elements, adding a new element type is done
;; through the following steps: implement a parser and an interpreter,
;; tweak `org-element-current-element' so that it recognizes the new
;; type and add that new type to `org-element-all-elements'.

;; As a special case, when the newly defined type is a block type,
;; `org-element-non-recursive-block-alist' has to be modified
;; accordingly.


;;;; Babel Call

(defun org-element-babel-call-parser ()
  "Parse a babel call.

Return a list whose CAR is `babel-call' and CDR is a plist
containing `:begin', `:end', `:info' and `:post-blank' as
keywords."
  (save-excursion
    (let ((case-fold-search t)
	  (info (progn (looking-at org-babel-block-lob-one-liner-regexp)
		       (org-babel-lob-get-info)))
	  (begin (point-at-bol))
	  (pos-before-blank (progn (forward-line) (point)))
	  (end (progn (org-skip-whitespace)
		      (if (eobp) (point) (point-at-bol)))))
      `(babel-call
	(:begin ,begin
		:end ,end
		:info ,info
		:post-blank ,(count-lines pos-before-blank end))))))

(defun org-element-babel-call-interpreter (babel-call contents)
  "Interpret BABEL-CALL element as Org syntax.
CONTENTS is nil."
  (let* ((babel-info (org-element-property :info babel-call))
	 (main (car babel-info))
	 (post-options (nth 1 babel-info)))
    (concat "#+CALL: "
	    (if (not (string-match "\\[\\(\\[.*?\\]\\)\\]" main)) main
	      ;; Remove redundant square brackets.
	      (replace-match (match-string 1 main) nil nil main))
	    (and post-options (format "[%s]" post-options)))))


;;;; Clock

(defun org-element-clock-parser ()
  "Parse a clock.

Return a list whose CAR is `clock' and CDR is a plist containing
`:status', `:value', `:time', `:begin', `:end' and `:post-blank'
as keywords."
  (save-excursion
    (let* ((case-fold-search nil)
	   (begin (point))
	   (value (progn (search-forward org-clock-string (line-end-position) t)
			 (org-skip-whitespace)
			 (looking-at "\\[.*\\]")
			 (org-match-string-no-properties 0)))
	   (time (and (progn (goto-char (match-end 0))
			     (looking-at " +=> +\\(\\S-+\\)[ \t]*$"))
		      (org-match-string-no-properties 1)))
	   (status (if time 'closed 'running))
	   (post-blank (let ((before-blank (progn (forward-line) (point))))
			 (org-skip-whitespace)
			 (unless (eobp) (beginning-of-line))
			 (count-lines before-blank (point))))
	   (end (point)))
      `(clock (:status ,status
		       :value ,value
		       :time ,time
		       :begin ,begin
		       :end ,end
		       :post-blank ,post-blank)))))

(defun org-element-clock-interpreter (clock contents)
  "Interpret CLOCK element as Org syntax.
CONTENTS is nil."
  (concat org-clock-string " "
	  (org-element-property :value clock)
	  (let ((time (org-element-property :time clock)))
	    (and time
		 (concat " => "
			 (apply 'format
				"%2s:%02s"
				(org-split-string time ":")))))))


;;;; Comment

(defun org-element-comment-parser ()
  "Parse a comment.

Return a list whose CAR is `comment' and CDR is a plist
containing `:begin', `:end', `:value' and `:post-blank'
keywords.

Assume point is at comment beginning."
  (save-excursion
    (let* ((keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   value
	   (com-end
	    ;; Get comments ending.  This may not be accurate if
	    ;; commented lines within an item are followed by
	    ;; commented lines outside of a list.  Though, parser will
	    ;; always get it right as it already knows surrounding
	    ;; element and has narrowed buffer to its contents.
	    (progn
	      (while (looking-at "\\(\\(# ?\\)[^+]\\|[ \t]*#\\+\\( \\|$\\)\\)")
		;; Accumulate lines without leading hash and plus sign
		;; if any.  First whitespace is also ignored.
		(setq value
		      (concat value
			      (buffer-substring-no-properties
			       (or (match-end 2) (match-end 3)) (point-at-eol))
			      "\n"))
		(forward-line))
	      (point)))
	   (end (progn (goto-char com-end)
		       (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(comment
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,(count-lines com-end end)
		,@(cadr keywords))))))

(defun org-element-comment-interpreter (comment contents)
  "Interpret COMMENT element as Org syntax.
CONTENTS is nil."
  (replace-regexp-in-string
   "^" "#+ "
   (substring (org-element-property :value comment) 0 -1)))


;;;; Comment Block

(defun org-element-comment-block-parser ()
  "Parse an export block.

Return a list whose CAR is `comment-block' and CDR is a plist
containing `:begin', `:end', `:hiddenp', `:value' and
`:post-blank' keywords.

Assume point is at comment block beginning."
  (save-excursion
    (let* ((case-fold-search t)
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end
	    (progn (re-search-forward "^[ \t]*#\\+END_COMMENT" nil t)
		   (point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol))))
	   (value (buffer-substring-no-properties contents-begin contents-end)))
      `(comment-block
	(:begin ,begin
		:end ,end
		:value ,value
		:hiddenp ,hidden
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-comment-block-interpreter (comment-block contents)
  "Interpret COMMENT-BLOCK element as Org syntax.
CONTENTS is nil."
  (format "#+BEGIN_COMMENT\n%s#+END_COMMENT"
	  (org-remove-indentation (org-element-property :value comment-block))))


;;;; Example Block

(defun org-element-example-block-parser ()
  "Parse an example block.

Return a list whose CAR is `example-block' and CDR is a plist
containing `:begin', `:end', `:number-lines', `:preserve-indent',
`:retain-labels', `:use-labels', `:label-fmt', `:hiddenp',
`:switches', `:value' and `:post-blank' keywords."
  (save-excursion
    (let* ((case-fold-search t)
	   (switches
	    (progn (looking-at "^[ \t]*#\\+BEGIN_EXAMPLE\\(?: +\\(.*\\)\\)?")
		   (org-match-string-no-properties 1)))
	   ;; Switches analysis
	   (number-lines (cond ((not switches) nil)
			       ((string-match "-n\\>" switches) 'new)
			       ((string-match "+n\\>" switches) 'continued)))
	   (preserve-indent (and switches (string-match "-i\\>" switches)))
	   ;; Should labels be retained in (or stripped from) example
	   ;; blocks?
	   (retain-labels
	    (or (not switches)
		(not (string-match "-r\\>" switches))
		(and number-lines (string-match "-k\\>" switches))))
	   ;; What should code-references use - labels or
	   ;; line-numbers?
	   (use-labels
	    (or (not switches)
		(and retain-labels (not (string-match "-k\\>" switches)))))
	   (label-fmt (and switches
			   (string-match "-l +\"\\([^\"\n]+\\)\"" switches)
			   (match-string 1 switches)))
	   ;; Standard block parsing.
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end
	    (progn (re-search-forward "^[ \t]*#\\+END_EXAMPLE" nil t)
		   (point-at-bol)))
	   (value (buffer-substring-no-properties contents-begin contents-end))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(example-block
	(:begin ,begin
		:end ,end
		:value ,value
		:switches ,switches
		:number-lines ,number-lines
		:preserve-indent ,preserve-indent
		:retain-labels ,retain-labels
		:use-labels ,use-labels
		:label-fmt ,label-fmt
		:hiddenp ,hidden
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-example-block-interpreter (example-block contents)
  "Interpret EXAMPLE-BLOCK element as Org syntax.
CONTENTS is nil."
  (let ((switches (org-element-property :switches example-block)))
    (concat "#+BEGIN_EXAMPLE" (and switches (concat " " switches)) "\n"
	    (org-remove-indentation
	     (org-element-property :value example-block))
	    "#+END_EXAMPLE")))


;;;; Export Block

(defun org-element-export-block-parser ()
  "Parse an export block.

Return a list whose CAR is `export-block' and CDR is a plist
containing `:begin', `:end', `:type', `:hiddenp', `:value' and
`:post-blank' keywords.

Assume point is at export-block beginning."
  (save-excursion
    (let* ((case-fold-search t)
	   (type (progn (looking-at "[ \t]*#\\+BEGIN_\\([A-Za-z0-9]+\\)")
			(upcase (org-match-string-no-properties 1))))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-begin (progn (forward-line) (point)))
	   (hidden (org-truely-invisible-p))
	   (contents-end
	    (progn (re-search-forward (concat "^[ \t]*#\\+END_" type) nil t)
		   (point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol))))
	   (value (buffer-substring-no-properties contents-begin contents-end)))
      `(export-block
	(:begin ,begin
		:end ,end
		:type ,type
		:value ,value
		:hiddenp ,hidden
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-export-block-interpreter (export-block contents)
  "Interpret EXPORT-BLOCK element as Org syntax.
CONTENTS is nil."
  (let ((type (org-element-property :type export-block)))
    (concat (format "#+BEGIN_%s\n" type)
	    (org-element-property :value export-block)
	    (format "#+END_%s" type))))


;;;; Fixed-width

(defun org-element-fixed-width-parser ()
  "Parse a fixed-width section.

Return a list whose CAR is `fixed-width' and CDR is a plist
containing `:begin', `:end', `:value' and `:post-blank' keywords.

Assume point is at the beginning of the fixed-width area."
  (save-excursion
    (let* ((keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   value
	   (end-area
	    ;; Ending position may not be accurate if fixed-width
	    ;; lines within an item are followed by fixed-width lines
	    ;; outside of a list.  Though, parser will always get it
	    ;; right as it already knows surrounding element and has
	    ;; narrowed buffer to its contents.
	    (progn
	      (while (looking-at "[ \t]*:\\( \\|$\\)")
		;, Accumulate text without starting colons.
		(setq value
		      (concat value
			      (buffer-substring-no-properties
			       (match-end 0) (point-at-eol))
			      "\n"))
		(forward-line))
	      (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(fixed-width
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,(count-lines end-area end)
		,@(cadr keywords))))))

(defun org-element-fixed-width-interpreter (fixed-width contents)
  "Interpret FIXED-WIDTH element as Org syntax.
CONTENTS is nil."
  (replace-regexp-in-string
   "^" ": " (substring (org-element-property :value fixed-width) 0 -1)))


;;;; Horizontal Rule

(defun org-element-horizontal-rule-parser ()
  "Parse an horizontal rule.

Return a list whose CAR is `horizontal-rule' and CDR is a plist
containing `:begin', `:end' and `:post-blank' keywords."
  (save-excursion
    (let* ((keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (post-hr (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(horizontal-rule
	(:begin ,begin
		:end ,end
		:post-blank ,(count-lines post-hr end)
		,@(cadr keywords))))))

(defun org-element-horizontal-rule-interpreter (horizontal-rule contents)
  "Interpret HORIZONTAL-RULE element as Org syntax.
CONTENTS is nil."
  "-----")


;;;; Keyword

(defun org-element-keyword-parser ()
  "Parse a keyword at point.

Return a list whose CAR is `keyword' and CDR is a plist
containing `:key', `:value', `:begin', `:end' and `:post-blank'
keywords."
  (save-excursion
    (let* ((case-fold-search t)
	   (begin (point))
	   (key (progn (looking-at
			"[ \t]*#\\+\\(\\(?:[a-z]+\\)\\(?:_[a-z]+\\)*\\):")
		       (upcase (org-match-string-no-properties 1))))
	   (value (org-trim (buffer-substring-no-properties
			     (match-end 0) (point-at-eol))))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(keyword
	(:key ,key
	      :value ,value
	      :begin ,begin
	      :end ,end
	      :post-blank ,(count-lines pos-before-blank end))))))

(defun org-element-keyword-interpreter (keyword contents)
  "Interpret KEYWORD element as Org syntax.
CONTENTS is nil."
  (format "#+%s: %s"
	  (org-element-property :key keyword)
	  (org-element-property :value keyword)))


;;;; Latex Environment

(defun org-element-latex-environment-parser ()
  "Parse a LaTeX environment.

Return a list whose CAR is `latex-environment' and CDR is a plist
containing `:begin', `:end', `:value' and `:post-blank'
keywords.

Assume point is at the beginning of the latex environment."
  (save-excursion
    (let* ((case-fold-search t)
	   (contents-begin (point))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-end (progn (re-search-forward "^[ \t]*\\\\end")
				(forward-line)
				(point)))
	   (value (buffer-substring-no-properties contents-begin contents-end))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(latex-environment
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,(count-lines contents-end end)
		,@(cadr keywords))))))

(defun org-element-latex-environment-interpreter (latex-environment contents)
  "Interpret LATEX-ENVIRONMENT element as Org syntax.
CONTENTS is nil."
  (org-element-property :value latex-environment))


;;;; Paragraph

(defun org-element-paragraph-parser ()
  "Parse a paragraph.

Return a list whose CAR is `paragraph' and CDR is a plist
containing `:begin', `:end', `:contents-begin' and
`:contents-end' and `:post-blank' keywords.

Assume point is at the beginning of the paragraph."
  (save-excursion
    (let* ((contents-begin (point))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (contents-end
	    (progn (end-of-line)
		   (if (re-search-forward org-element-paragraph-separate nil 'm)
		       (progn (forward-line -1) (end-of-line) (point))
		     (point))))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(paragraph
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-paragraph-interpreter (paragraph contents)
  "Interpret PARAGRAPH element as Org syntax.
CONTENTS is the contents of the element."
  contents)


;;;; Planning

(defun org-element-planning-parser ()
  "Parse a planning.

Return a list whose CAR is `planning' and CDR is a plist
containing `:closed', `:deadline', `:scheduled', `:begin', `:end'
and `:post-blank' keywords."
  (save-excursion
    (let* ((case-fold-search nil)
	   (begin (point))
	   (post-blank (let ((before-blank (progn (forward-line) (point))))
			 (org-skip-whitespace)
			 (unless (eobp) (beginning-of-line))
			 (count-lines before-blank (point))))
	   (end (point))
	   closed deadline scheduled)
      (goto-char begin)
      (while (re-search-forward org-keyword-time-not-clock-regexp
				(line-end-position) t)
	(goto-char (match-end 1))
	(org-skip-whitespace)
	(let ((time (buffer-substring-no-properties (point) (match-end 0)))
	      (keyword (match-string 1)))
	  (cond ((equal keyword org-closed-string) (setq closed time))
		((equal keyword org-deadline-string) (setq deadline time))
		(t (setq scheduled time)))))
      `(planning
	(:closed ,closed
		 :deadline ,deadline
		 :scheduled ,scheduled
		 :begin ,begin
		 :end ,end
		 :post-blank ,post-blank)))))

(defun org-element-planning-interpreter (planning contents)
  "Interpret PLANNING element as Org syntax.
CONTENTS is nil."
  (mapconcat
   'identity
   (delq nil
	 (list (let ((closed (org-element-property :closed planning)))
		 (when closed (concat org-closed-string " " closed)))
	       (let ((deadline (org-element-property :deadline planning)))
		 (when deadline (concat org-deadline-string " " deadline)))
	       (let ((scheduled (org-element-property :scheduled planning)))
		 (when scheduled (concat org-scheduled-string " " scheduled)))))
   " "))


;;;; Property Drawer

(defun org-element-property-drawer-parser ()
  "Parse a property drawer.

Return a list whose CAR is `property-drawer' and CDR is a plist
containing `:begin', `:end', `:hiddenp', `:contents-begin',
`:contents-end', `:properties' and `:post-blank' keywords.

Assume point is at the beginning of the property drawer."
  (save-excursion
    (let ((case-fold-search t)
	  (begin (point))
	  (prop-begin (progn (forward-line) (point)))
	  (hidden (org-truely-invisible-p))
	  (properties
	   (let (val)
	     (while (not (looking-at "^[ \t]*:END:"))
	       (when (looking-at "[ \t]*:\\([A-Za-z][-_A-Za-z0-9]*\\):")
		 (push (cons (org-match-string-no-properties 1)
			     (org-trim
			      (buffer-substring-no-properties
			       (match-end 0) (point-at-eol))))
		       val))
	       (forward-line))
	     val))
	  (prop-end (progn (re-search-forward "^[ \t]*:END:" nil t)
			   (point-at-bol)))
	  (pos-before-blank (progn (forward-line) (point)))
	  (end (progn (org-skip-whitespace)
		      (if (eobp) (point) (point-at-bol)))))
      `(property-drawer
	(:begin ,begin
		:end ,end
		:hiddenp ,hidden
		:properties ,properties
		:post-blank ,(count-lines pos-before-blank end))))))

(defun org-element-property-drawer-interpreter (property-drawer contents)
  "Interpret PROPERTY-DRAWER element as Org syntax.
CONTENTS is nil."
  (let ((props (org-element-property :properties property-drawer)))
    (concat
     ":PROPERTIES:\n"
     (mapconcat (lambda (p)
		  (format org-property-format (format ":%s:" (car p)) (cdr p)))
		(nreverse props) "\n")
     "\n:END:")))


;;;; Quote Section

(defun org-element-quote-section-parser ()
  "Parse a quote section.

Return a list whose CAR is `quote-section' and CDR is a plist
containing `:begin', `:end', `:value' and `:post-blank' keywords.

Assume point is at beginning of the section."
  (save-excursion
    (let* ((begin (point))
	   (end (progn (org-with-limited-levels (outline-next-heading))
		       (point)))
	   (pos-before-blank (progn (skip-chars-backward " \r\t\n")
				    (forward-line)
				    (point)))
	   (value (buffer-substring-no-properties begin pos-before-blank)))
      `(quote-section
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,(count-lines pos-before-blank end))))))

(defun org-element-quote-section-interpreter (quote-section contents)
  "Interpret QUOTE-SECTION element as Org syntax.
CONTENTS is nil."
  (org-element-property :value quote-section))


;;;; Src Block

(defun org-element-src-block-parser ()
  "Parse a src block.

Return a list whose CAR is `src-block' and CDR is a plist
containing `:language', `:switches', `:parameters', `:begin',
`:end', `:hiddenp', `:contents-begin', `:contents-end',
`:number-lines', `:retain-labels', `:use-labels', `:label-fmt',
`:preserve-indent', `:value' and `:post-blank' keywords.

Assume point is at the beginning of the block."
  (save-excursion
    (let* ((case-fold-search t)
	   (contents-begin (point))
	   ;; Get affiliated keywords.
	   (keywords (org-element-collect-affiliated-keywords))
	   ;; Get beginning position.
	   (begin (car keywords))
	   ;; Get language as a string.
	   (language
	    (progn
	      (looking-at
	       (concat "^[ \t]*#\\+BEGIN_SRC"
		       "\\(?: +\\(\\S-+\\)\\)?"
		       "\\(\\(?: +\\(?:-l \".*?\"\\|[-+][A-Za-z]\\)\\)+\\)?"
		       "\\(.*\\)[ \t]*$"))
	      (org-match-string-no-properties 1)))
	   ;; Get switches.
	   (switches (org-match-string-no-properties 2))
	   ;; Get parameters.
	   (parameters (org-match-string-no-properties 3))
	   ;; Switches analysis
	   (number-lines (cond ((not switches) nil)
			       ((string-match "-n\\>" switches) 'new)
			       ((string-match "+n\\>" switches) 'continued)))
	   (preserve-indent (and switches (string-match "-i\\>" switches)))
	   (label-fmt (and switches
			   (string-match "-l +\"\\([^\"\n]+\\)\"" switches)
			   (match-string 1 switches)))
	   ;; Should labels be retained in (or stripped from) src
	   ;; blocks?
	   (retain-labels
	    (or (not switches)
		(not (string-match "-r\\>" switches))
		(and number-lines (string-match "-k\\>" switches))))
	   ;; What should code-references use - labels or
	   ;; line-numbers?
	   (use-labels
	    (or (not switches)
		(and retain-labels (not (string-match "-k\\>" switches)))))
	   ;; Get position at end of block.
	   (contents-end (progn (re-search-forward "^[ \t]*#\\+END_SRC" nil t)
				(forward-line)
				(point)))
	   ;; Retrieve code.
	   (value (buffer-substring-no-properties
		   (save-excursion (goto-char contents-begin)
				   (forward-line)
				   (point))
		   (match-beginning 0)))
	   ;; Get position after ending blank lines.
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol))))
	   ;; Get visibility status.
	   (hidden (progn (goto-char contents-begin)
			  (forward-line)
			  (org-truely-invisible-p))))
      `(src-block
	(:language ,language
		   :switches ,(and (org-string-nw-p switches)
				   (org-trim switches))
		   :parameters ,(and (org-string-nw-p parameters)
				     (org-trim parameters))
		   :begin ,begin
		   :end ,end
		   :number-lines ,number-lines
		   :preserve-indent ,preserve-indent
		   :retain-labels ,retain-labels
		   :use-labels ,use-labels
		   :label-fmt ,label-fmt
		   :hiddenp ,hidden
		   :value ,value
		   :post-blank ,(count-lines contents-end end)
		   ,@(cadr keywords))))))

(defun org-element-src-block-interpreter (src-block contents)
  "Interpret SRC-BLOCK element as Org syntax.
CONTENTS is nil."
  (let ((lang (org-element-property :language src-block))
	(switches (org-element-property :switches src-block))
	(params (org-element-property :parameters src-block))
	(value (let ((val (org-element-property :value src-block)))
		 (cond

		  (org-src-preserve-indentation val)
		  ((zerop org-edit-src-content-indentation)
		   (org-remove-indentation val))
		  (t
		   (let ((ind (make-string
			       org-edit-src-content-indentation 32)))
		     (replace-regexp-in-string
		      "\\(^\\)[ \t]*\\S-" ind
		      (org-remove-indentation val) nil nil 1)))))))
    (concat (format "#+BEGIN_SRC%s\n"
		    (concat (and lang (concat " " lang))
			    (and switches (concat " " switches))
			    (and params (concat " " params))))
	    value
	    "#+END_SRC")))


;;;; Table

(defun org-element-table-parser ()
  "Parse a table at point.

Return a list whose CAR is `table' and CDR is a plist containing
`:begin', `:end', `:tblfm', `:type', `:contents-begin',
`:contents-end', `:value' and `:post-blank' keywords.

Assume point is at the beginning of the table."
  (save-excursion
    (let* ((case-fold-search t)
	   (table-begin (point))
	   (type (if (org-at-table.el-p) 'table.el 'org))
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (table-end (goto-char (marker-position (org-table-end t))))
	   (tblfm (when (looking-at "[ \t]*#\\+TBLFM: +\\(.*\\)[ \t]*$")
		    (prog1 (org-match-string-no-properties 1)
		      (forward-line))))
	   (pos-before-blank (point))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(table
	(:begin ,begin
		:end ,end
		:type ,type
		:tblfm ,tblfm
		;; Only `org' tables have contents.  `table.el' tables
		;; use a `:value' property to store raw table as
		;; a string.
		:contents-begin ,(and (eq type 'org) table-begin)
		:contents-end ,(and (eq type 'org) table-end)
		:value ,(and (eq type 'table.el)
			     (buffer-substring-no-properties
			      table-begin table-end))
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-table-interpreter (table contents)
  "Interpret TABLE element as Org syntax.
CONTENTS is nil."
  (if (eq (org-element-property :type table) 'table.el)
      (org-remove-indentation (org-element-property :value table))
    (concat (with-temp-buffer (insert contents)
			      (org-table-align)
			      (buffer-string))
	    (when (org-element-property :tblfm table)
	      (format "#+TBLFM: " (org-element-property :tblfm table))))))


;;;; Table Row

(defun org-element-table-row-parser ()
  "Parse table row at point.

Return a list whose CAR is `table-row' and CDR is a plist
containing `:begin', `:end', `:contents-begin', `:contents-end',
`:type' and `:post-blank' keywords."
  (save-excursion
    (let* ((type (if (looking-at "^[ \t]*|-") 'rule 'standard))
	   (begin (point))
	   ;; A table rule has no contents.  In that case, ensure
	   ;; CONTENTS-BEGIN matches CONTENTS-END.
	   (contents-begin (if (eq type 'standard)
			       (progn (search-forward "|") (point))
			     (end-of-line)
			     (skip-chars-backward " \r\t\n")
			     (point)))
	   (contents-end (progn (end-of-line)
				(skip-chars-backward " \r\t\n")
				(point)))
	   (end (progn (forward-line) (point))))
      `(table-row
	(:type ,type
	       :begin ,begin
	       :end ,end
	       :contents-begin ,contents-begin
	       :contents-end ,contents-end
	       :post-blank 0)))))

(defun org-element-table-row-interpreter (table-row contents)
  "Interpret TABLE-ROW element as Org syntax.
CONTENTS is the contents of the table row."
  (if (eq (org-element-property :type table-row) 'rule) "|-"
    (concat "| " contents)))


;;;; Verse Block

(defun org-element-verse-block-parser ()
  "Parse a verse block.

Return a list whose CAR is `verse-block' and CDR is a plist
containing `:begin', `:end', `:contents-begin', `:contents-end',
`:hiddenp' and `:post-blank' keywords.

Assume point is at beginning of the block."
  (save-excursion
    (let* ((case-fold-search t)
	   (keywords (org-element-collect-affiliated-keywords))
	   (begin (car keywords))
	   (hidden (progn (forward-line) (org-truely-invisible-p)))
	   (contents-begin (point))
	   (contents-end
	    (progn
	      (re-search-forward (concat "^[ \t]*#\\+END_VERSE") nil t)
	      (point-at-bol)))
	   (pos-before-blank (progn (forward-line) (point)))
	   (end (progn (org-skip-whitespace)
		       (if (eobp) (point) (point-at-bol)))))
      `(verse-block
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:hiddenp ,hidden
		:post-blank ,(count-lines pos-before-blank end)
		,@(cadr keywords))))))

(defun org-element-verse-block-interpreter (verse-block contents)
  "Interpret VERSE-BLOCK element as Org syntax.
CONTENTS is verse block contents."
  (format "#+BEGIN_VERSE\n%s#+END_VERSE" contents))



;;; Objects
;;
;; Unlike to elements, interstices can be found between objects.
;; That's why, along with the parser, successor functions are provided
;; for each object. Some objects share the same successor (i.e. `code'
;; and `verbatim' objects).
;;
;; A successor must accept a single argument bounding the search.  It
;; will return either a cons cell whose CAR is the object's type, as
;; a symbol, and CDR the position of its next occurrence, or nil.
;;
;; Successors follow the naming convention:
;; org-element-NAME-successor, where NAME is the name of the
;; successor, as defined in `org-element-all-successors'.
;;
;; Some object types (i.e. `emphasis') are recursive.  Restrictions on
;; object types they can contain will be specified in
;; `org-element-object-restrictions'.
;;
;; Adding a new type of object is simple.  Implement a successor,
;; a parser, and an interpreter for it, all following the naming
;; convention.  Register type in `org-element-all-objects' and
;; successor in `org-element-all-successors'.  Maybe tweak
;; restrictions about it, and that's it.


;;;; Bold

(defun org-element-bold-parser ()
  "Parse bold object at point.

Return a list whose CAR is `bold' and CDR is a plist with
`:begin', `:end', `:contents-begin' and `:contents-end' and
`:post-blank' keywords.

Assume point is at the first star marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (contents-begin (match-beginning 4))
	  (contents-end (match-end 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(bold
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-bold-interpreter (bold contents)
  "Interpret BOLD object as Org syntax.
CONTENTS is the contents of the object."
  (format "*%s*" contents))

(defun org-element-text-markup-successor (limit)
  "Search for the next text-markup object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is a symbol among `bold',
`italic', `underline', `strike-through', `code' and `verbatim'
and CDR is beginning position."
  (save-excursion
    (unless (bolp) (backward-char))
    (when (re-search-forward org-emph-re limit t)
      (let ((marker (match-string 3)))
	(cons (cond
	       ((equal marker "*") 'bold)
	       ((equal marker "/") 'italic)
	       ((equal marker "_") 'underline)
	       ((equal marker "+") 'strike-through)
	       ((equal marker "~") 'code)
	       ((equal marker "=") 'verbatim)
	       (t (error "Unknown marker at %d" (match-beginning 3))))
	      (match-beginning 2))))))


;;;; Code

(defun org-element-code-parser ()
  "Parse code object at point.

Return a list whose CAR is `code' and CDR is a plist with
`:value', `:begin', `:end' and `:post-blank' keywords.

Assume point is at the first tilde marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (value (org-match-string-no-properties 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(code
	(:value ,value
		:begin ,begin
		:end ,end
		:post-blank ,post-blank)))))

(defun org-element-code-interpreter (code contents)
  "Interpret CODE object as Org syntax.
CONTENTS is nil."
  (format "~%s~" (org-element-property :value code)))


;;;; Entity

(defun org-element-entity-parser ()
  "Parse entity at point.

Return a list whose CAR is `entity' and CDR a plist with
`:begin', `:end', `:latex', `:latex-math-p', `:html', `:latin1',
`:utf-8', `:ascii', `:use-brackets-p' and `:post-blank' as
keywords.

Assume point is at the beginning of the entity."
  (save-excursion
    (looking-at "\\\\\\(frac[13][24]\\|[a-zA-Z]+\\)\\($\\|{}\\|[^[:alpha:]]\\)")
    (let* ((value (org-entity-get (match-string 1)))
	   (begin (match-beginning 0))
	   (bracketsp (string= (match-string 2) "{}"))
	   (post-blank (progn (goto-char (match-end 1))
			      (when bracketsp (forward-char 2))
			      (skip-chars-forward " \t")))
	   (end (point)))
      `(entity
	(:name ,(car value)
	       :latex ,(nth 1 value)
	       :latex-math-p ,(nth 2 value)
	       :html ,(nth 3 value)
	       :ascii ,(nth 4 value)
	       :latin1 ,(nth 5 value)
	       :utf-8 ,(nth 6 value)
	       :begin ,begin
	       :end ,end
	       :use-brackets-p ,bracketsp
	       :post-blank ,post-blank)))))

(defun org-element-entity-interpreter (entity contents)
  "Interpret ENTITY object as Org syntax.
CONTENTS is nil."
  (concat "\\"
	  (org-element-property :name entity)
	  (when (org-element-property :use-brackets-p entity) "{}")))

(defun org-element-latex-or-entity-successor (limit)
  "Search for the next latex-fragment or entity object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `entity' or
`latex-fragment' and CDR is beginning position."
  (save-excursion
    (let ((matchers (plist-get org-format-latex-options :matchers))
	  ;; ENTITY-RE matches both LaTeX commands and Org entities.
	  (entity-re
	   "\\\\\\(frac[13][24]\\|[a-zA-Z]+\\)\\($\\|[^[:alpha:]\n]\\)"))
      (when (re-search-forward
	     (concat (mapconcat (lambda (e) (nth 1 (assoc e org-latex-regexps)))
				matchers "\\|")
		     "\\|" entity-re)
	     limit t)
	(goto-char (match-beginning 0))
	(if (looking-at entity-re)
	    ;; Determine if it's a real entity or a LaTeX command.
	    (cons (if (org-entity-get (match-string 1)) 'entity 'latex-fragment)
		  (match-beginning 0))
	  ;; No entity nor command: point is at a LaTeX fragment.
	  ;; Determine its type to get the correct beginning position.
	  (cons 'latex-fragment
		(catch 'return
		  (mapc (lambda (e)
			  (when (looking-at (nth 1 (assoc e org-latex-regexps)))
			    (throw 'return
				   (match-beginning
				    (nth 2 (assoc e org-latex-regexps))))))
			matchers)
		  (point))))))))


;;;; Export Snippet

(defun org-element-export-snippet-parser ()
  "Parse export snippet at point.

Return a list whose CAR is `export-snippet' and CDR a plist with
`:begin', `:end', `:back-end', `:value' and `:post-blank' as
keywords.

Assume point is at the beginning of the snippet."
  (save-excursion
    (looking-at "<\\([-A-Za-z0-9]+\\)@")
    (let* ((begin (point))
	   (back-end (org-match-string-no-properties 1))
	   (inner-begin (match-end 0))
	   (inner-end
	    (let ((count 1))
	      (goto-char inner-begin)
	      (while (and (> count 0) (re-search-forward "[<>]" nil t))
		(if (equal (match-string 0) "<") (incf count) (decf count)))
	      (1- (point))))
	   (value (buffer-substring-no-properties inner-begin inner-end))
	   (post-blank (skip-chars-forward " \t"))
	   (end (point)))
      `(export-snippet
	(:back-end ,back-end
		   :value ,value
		   :begin ,begin
		   :end ,end
		   :post-blank ,post-blank)))))

(defun org-element-export-snippet-interpreter (export-snippet contents)
  "Interpret EXPORT-SNIPPET object as Org syntax.
CONTENTS is nil."
  (format "<%s@%s>"
	  (org-element-property :back-end export-snippet)
	  (org-element-property :value export-snippet)))

(defun org-element-export-snippet-successor (limit)
  "Search for the next export-snippet object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `export-snippet' CDR is
its beginning position."
  (save-excursion
    (catch 'exit
      (while (re-search-forward "<[-A-Za-z0-9]+@" limit t)
	(save-excursion
	  (let ((beg (match-beginning 0))
		(count 1))
	    (while (re-search-forward "[<>]" limit t)
	      (if (equal (match-string 0) "<") (incf count) (decf count))
	      (when (zerop count)
		(throw 'exit (cons 'export-snippet beg))))))))))


;;;; Footnote Reference

(defun org-element-footnote-reference-parser ()
  "Parse footnote reference at point.

Return a list whose CAR is `footnote-reference' and CDR a plist
with `:label', `:type', `:inline-definition', `:begin', `:end'
and `:post-blank' as keywords."
  (save-excursion
    (looking-at org-footnote-re)
    (let* ((begin (point))
	   (label (or (org-match-string-no-properties 2)
		      (org-match-string-no-properties 3)
		      (and (match-string 1)
			   (concat "fn:" (org-match-string-no-properties 1)))))
	   (type (if (or (not label) (match-string 1)) 'inline 'standard))
	   (inner-begin (match-end 0))
	   (inner-end
	    (let ((count 1))
	      (forward-char)
	      (while (and (> count 0) (re-search-forward "[][]" nil t))
		(if (equal (match-string 0) "[") (incf count) (decf count)))
	      (1- (point))))
	   (post-blank (progn (goto-char (1+ inner-end))
			      (skip-chars-forward " \t")))
	   (end (point))
	   (inline-definition
	    (and (eq type 'inline)
		 (org-element-parse-secondary-string
		  (buffer-substring inner-begin inner-end)
		  (org-element-restriction 'footnote-reference)))))
      `(footnote-reference
	(:label ,label
		:type ,type
		:inline-definition ,inline-definition
		:begin ,begin
		:end ,end
		:post-blank ,post-blank)))))

(defun org-element-footnote-reference-interpreter (footnote-reference contents)
  "Interpret FOOTNOTE-REFERENCE object as Org syntax.
CONTENTS is nil."
  (let ((label (or (org-element-property :label footnote-reference) "fn:"))
	(def
	 (let ((inline-def
		(org-element-property :inline-definition footnote-reference)))
	   (if (not inline-def) ""
	     (concat ":" (org-element-interpret-data inline-def))))))
    (format "[%s]" (concat label def))))

(defun org-element-footnote-reference-successor (limit)
  "Search for the next footnote-reference object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `footnote-reference' and
CDR is beginning position."
  (save-excursion
    (catch 'exit
      (while (re-search-forward org-footnote-re limit t)
	(save-excursion
	  (let ((beg (match-beginning 0))
		(count 1))
	    (backward-char)
	    (while (re-search-forward "[][]" limit t)
	      (if (equal (match-string 0) "[") (incf count) (decf count))
	      (when (zerop count)
		(throw 'exit (cons 'footnote-reference beg))))))))))


;;;; Inline Babel Call

(defun org-element-inline-babel-call-parser ()
  "Parse inline babel call at point.

Return a list whose CAR is `inline-babel-call' and CDR a plist
with `:begin', `:end', `:info' and `:post-blank' as keywords.

Assume point is at the beginning of the babel call."
  (save-excursion
    (unless (bolp) (backward-char))
    (looking-at org-babel-inline-lob-one-liner-regexp)
    (let ((info (save-match-data (org-babel-lob-get-info)))
	  (begin (match-end 1))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(inline-babel-call
	(:begin ,begin
		:end ,end
		:info ,info
		:post-blank ,post-blank)))))

(defun org-element-inline-babel-call-interpreter (inline-babel-call contents)
  "Interpret INLINE-BABEL-CALL object as Org syntax.
CONTENTS is nil."
  (let* ((babel-info (org-element-property :info inline-babel-call))
	 (main-source (car babel-info))
	 (post-options (nth 1 babel-info)))
    (concat "call_"
	    (if (string-match "\\[\\(\\[.*?\\]\\)\\]" main-source)
		;; Remove redundant square brackets.
		(replace-match
		 (match-string 1 main-source) nil nil main-source)
	      main-source)
	    (and post-options (format "[%s]" post-options)))))

(defun org-element-inline-babel-call-successor (limit)
  "Search for the next inline-babel-call object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `inline-babel-call' and
CDR is beginning position."
  (save-excursion
    ;; Use a simplified version of
    ;; org-babel-inline-lob-one-liner-regexp as regexp for more speed.
    (when (re-search-forward
	   "\\(?:babel\\|call\\)_\\([^()\n]+?\\)\\(\\[\\(.*\\)\\]\\|\\(\\)\\)(\\([^\n]*\\))\\(\\[\\(.*?\\)\\]\\)?"
	   limit t)
      (cons 'inline-babel-call (match-beginning 0)))))


;;;; Inline Src Block

(defun org-element-inline-src-block-parser ()
  "Parse inline source block at point.

Return a list whose CAR is `inline-src-block' and CDR a plist
with `:begin', `:end', `:language', `:value', `:parameters' and
`:post-blank' as keywords.

Assume point is at the beginning of the inline src block."
  (save-excursion
    (unless (bolp) (backward-char))
    (looking-at org-babel-inline-src-block-regexp)
    (let ((begin (match-beginning 1))
	  (language (org-match-string-no-properties 2))
	  (parameters (org-match-string-no-properties 4))
	  (value (org-match-string-no-properties 5))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(inline-src-block
	(:language ,language
		   :value ,value
		   :parameters ,parameters
		   :begin ,begin
		   :end ,end
		   :post-blank ,post-blank)))))

(defun org-element-inline-src-block-interpreter (inline-src-block contents)
  "Interpret INLINE-SRC-BLOCK object as Org syntax.
CONTENTS is nil."
  (let ((language (org-element-property :language inline-src-block))
	(arguments (org-element-property :parameters inline-src-block))
	(body (org-element-property :value inline-src-block)))
    (format "src_%s%s{%s}"
	    language
	    (if arguments (format "[%s]" arguments) "")
	    body)))

(defun org-element-inline-src-block-successor (limit)
  "Search for the next inline-babel-call element.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `inline-babel-call' and
CDR is beginning position."
  (save-excursion
    (when (re-search-forward org-babel-inline-src-block-regexp limit t)
      (cons 'inline-src-block (match-beginning 1)))))

;;;; Italic

(defun org-element-italic-parser ()
  "Parse italic object at point.

Return a list whose CAR is `italic' and CDR is a plist with
`:begin', `:end', `:contents-begin' and `:contents-end' and
`:post-blank' keywords.

Assume point is at the first slash marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (contents-begin (match-beginning 4))
	  (contents-end (match-end 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(italic
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-italic-interpreter (italic contents)
  "Interpret ITALIC object as Org syntax.
CONTENTS is the contents of the object."
  (format "/%s/" contents))


;;;; Latex Fragment

(defun org-element-latex-fragment-parser ()
  "Parse latex fragment at point.

Return a list whose CAR is `latex-fragment' and CDR a plist with
`:value', `:begin', `:end', and `:post-blank' as keywords.

Assume point is at the beginning of the latex fragment."
  (save-excursion
    (let* ((begin (point))
	   (substring-match
	    (catch 'exit
	      (mapc (lambda (e)
		      (let ((latex-regexp (nth 1 (assoc e org-latex-regexps))))
			(when (or (looking-at latex-regexp)
				  (and (not (bobp))
				       (save-excursion
					 (backward-char)
					 (looking-at latex-regexp))))
			  (throw 'exit (nth 2 (assoc e org-latex-regexps))))))
		    (plist-get org-format-latex-options :matchers))
	      ;; None found: it's a macro.
	      (looking-at "\\\\[a-zA-Z]+\\*?\\(\\(\\[[^][\n{}]*\\]\\)\\|\\({[^{}\n]*}\\)\\)*")
	      0))
	   (value (match-string-no-properties substring-match))
	   (post-blank (progn (goto-char (match-end substring-match))
			      (skip-chars-forward " \t")))
	   (end (point)))
      `(latex-fragment
	(:value ,value
		:begin ,begin
		:end ,end
		:post-blank ,post-blank)))))

(defun org-element-latex-fragment-interpreter (latex-fragment contents)
  "Interpret LATEX-FRAGMENT object as Org syntax.
CONTENTS is nil."
  (org-element-property :value latex-fragment))

;;;; Line Break

(defun org-element-line-break-parser ()
  "Parse line break at point.

Return a list whose CAR is `line-break', and CDR a plist with
`:begin', `:end' and `:post-blank' keywords.

Assume point is at the beginning of the line break."
  (let ((begin (point))
	(end (save-excursion (forward-line) (point))))
    `(line-break (:begin ,begin :end ,end :post-blank 0))))

(defun org-element-line-break-interpreter (line-break contents)
  "Interpret LINE-BREAK object as Org syntax.
CONTENTS is nil."
  "\\\\\n")

(defun org-element-line-break-successor (limit)
  "Search for the next line-break object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `line-break' and CDR is
beginning position."
  (save-excursion
    (let ((beg (and (re-search-forward "[^\\\\]\\(\\\\\\\\\\)[ \t]*$" limit t)
		    (goto-char (match-beginning 1)))))
      ;; A line break can only happen on a non-empty line.
      (when (and beg (re-search-backward "\\S-" (point-at-bol) t))
	(cons 'line-break beg)))))


;;;; Link

(defun org-element-link-parser ()
  "Parse link at point.

Return a list whose CAR is `link' and CDR a plist with `:type',
`:path', `:raw-link', `:begin', `:end', `:contents-begin',
`:contents-end' and `:post-blank' as keywords.

Assume point is at the beginning of the link."
  (save-excursion
    (let ((begin (point))
	  end contents-begin contents-end link-end post-blank path type
	  raw-link link)
      (cond
       ;; Type 1: Text targeted from a radio target.
       ((and org-target-link-regexp (looking-at org-target-link-regexp))
	(setq type "radio"
	      link-end (match-end 0)
	      path (org-match-string-no-properties 0)))
       ;; Type 2: Standard link, i.e. [[http://orgmode.org][homepage]]
       ((looking-at org-bracket-link-regexp)
	(setq contents-begin (match-beginning 3)
	      contents-end (match-end 3)
	      link-end (match-end 0)
	      ;; RAW-LINK is the original link.
	      raw-link (org-match-string-no-properties 1)
	      link (org-translate-link
		    (org-link-expand-abbrev
		     (org-link-unescape raw-link))))
	;; Determine TYPE of link and set PATH accordingly.
	(cond
	 ;; File type.
	 ((or (file-name-absolute-p link) (string-match "^\\.\\.?/" link))
	  (setq type "file" path link))
	 ;; Explicit type (http, irc, bbdb...).  See `org-link-types'.
	 ((string-match org-link-re-with-space3 link)
	  (setq type (match-string 1 link) path (match-string 2 link)))
	 ;; Id type: PATH is the id.
	 ((string-match "^id:\\([-a-f0-9]+\\)" link)
	  (setq type "id" path (match-string 1 link)))
	 ;; Code-ref type: PATH is the name of the reference.
	 ((string-match "^(\\(.*\\))$" link)
	  (setq type "coderef" path (match-string 1 link)))
	 ;; Custom-id type: PATH is the name of the custom id.
	 ((= (aref link 0) ?#)
	  (setq type "custom-id" path (substring link 1)))
	 ;; Fuzzy type: Internal link either matches a target, an
	 ;; headline name or nothing.  PATH is the target or
	 ;; headline's name.
	 (t (setq type "fuzzy" path link))))
       ;; Type 3: Plain link, i.e. http://orgmode.org
       ((looking-at org-plain-link-re)
	(setq raw-link (org-match-string-no-properties 0)
	      type (org-match-string-no-properties 1)
	      path (org-match-string-no-properties 2)
	      link-end (match-end 0)))
       ;; Type 4: Angular link, i.e. <http://orgmode.org>
       ((looking-at org-angle-link-re)
	(setq raw-link (buffer-substring-no-properties
			(match-beginning 1) (match-end 2))
	      type (org-match-string-no-properties 1)
	      path (org-match-string-no-properties 2)
	      link-end (match-end 0))))
      ;; In any case, deduce end point after trailing white space from
      ;; LINK-END variable.
      (setq post-blank (progn (goto-char link-end) (skip-chars-forward " \t"))
	    end (point))
      `(link
	(:type ,type
	       :path ,path
	       :raw-link ,(or raw-link path)
	       :begin ,begin
	       :end ,end
	       :contents-begin ,contents-begin
	       :contents-end ,contents-end
	       :post-blank ,post-blank)))))

(defun org-element-link-interpreter (link contents)
  "Interpret LINK object as Org syntax.
CONTENTS is the contents of the object, or nil."
  (let ((type (org-element-property :type link))
	(raw-link (org-element-property :raw-link link)))
    (if (string= type "radio") raw-link
      (format "[[%s]%s]"
	      raw-link
	      (if contents (format "[%s]" contents) "")))))

(defun org-element-link-successor (limit)
  "Search for the next link object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `link' and CDR is
beginning position."
  (save-excursion
    (let ((link-regexp
	   (if (not org-target-link-regexp) org-any-link-re
	     (concat org-any-link-re "\\|" org-target-link-regexp))))
      (when (re-search-forward link-regexp limit t)
	(cons 'link (match-beginning 0))))))


;;;; Macro

(defun org-element-macro-parser ()
  "Parse macro at point.

Return a list whose CAR is `macro' and CDR a plist with `:key',
`:args', `:begin', `:end', `:value' and `:post-blank' as
keywords.

Assume point is at the macro."
  (save-excursion
    (looking-at "{{{\\([a-zA-Z][-a-zA-Z0-9_]*\\)\\(([ \t\n]*\\([^\000]*?\\))\\)?}}}")
    (let ((begin (point))
	  (key (downcase (org-match-string-no-properties 1)))
	  (value (org-match-string-no-properties 0))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point))
	  (args (let ((args (org-match-string-no-properties 3)) args2)
		  (when args
		    (setq args (org-split-string args ","))
		    (while args
		      (while (string-match "\\\\\\'" (car args))
			;; Repair bad splits.
			(setcar (cdr args) (concat (substring (car args) 0 -1)
						   "," (nth 1 args)))
			(pop args))
		      (push (pop args) args2))
		    (mapcar 'org-trim (nreverse args2))))))
      `(macro
	(:key ,key
	      :value ,value
	      :args ,args
	      :begin ,begin
	      :end ,end
	      :post-blank ,post-blank)))))

(defun org-element-macro-interpreter (macro contents)
  "Interpret MACRO object as Org syntax.
CONTENTS is nil."
  (org-element-property :value macro))

(defun org-element-macro-successor (limit)
  "Search for the next macro object.

LIMIT bounds the search.

Return value is cons cell whose CAR is `macro' and CDR is
beginning position."
  (save-excursion
    (when (re-search-forward
	   "{{{\\([a-zA-Z][-a-zA-Z0-9_]*\\)\\(([ \t\n]*\\([^\000]*?\\))\\)?}}}"
	   limit t)
      (cons 'macro (match-beginning 0)))))


;;;; Radio-target

(defun org-element-radio-target-parser ()
  "Parse radio target at point.

Return a list whose CAR is `radio-target' and CDR a plist with
`:begin', `:end', `:contents-begin', `:contents-end', `:value'
and `:post-blank' as keywords.

Assume point is at the radio target."
  (save-excursion
    (looking-at org-radio-target-regexp)
    (let ((begin (point))
	  (contents-begin (match-beginning 1))
	  (contents-end (match-end 1))
	  (value (org-match-string-no-properties 1))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(radio-target
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank
		:value ,value)))))

(defun org-element-radio-target-interpreter (target contents)
  "Interpret TARGET object as Org syntax.
CONTENTS is the contents of the object."
  (concat "<<<" contents ">>>"))

(defun org-element-radio-target-successor (limit)
  "Search for the next radio-target object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `radio-target' and CDR
is beginning position."
  (save-excursion
     (when (re-search-forward org-radio-target-regexp limit t)
       (cons 'radio-target (match-beginning 0)))))


;;;; Statistics Cookie

(defun org-element-statistics-cookie-parser ()
  "Parse statistics cookie at point.

Return a list whose CAR is `statistics-cookie', and CDR a plist
with `:begin', `:end', `:value' and `:post-blank' keywords.

Assume point is at the beginning of the statistics-cookie."
  (save-excursion
    (looking-at "\\[[0-9]*\\(%\\|/[0-9]*\\)\\]")
    (let* ((begin (point))
	   (value (buffer-substring-no-properties
		   (match-beginning 0) (match-end 0)))
	   (post-blank (progn (goto-char (match-end 0))
			      (skip-chars-forward " \t")))
	   (end (point)))
      `(statistics-cookie
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,post-blank)))))

(defun org-element-statistics-cookie-interpreter (statistics-cookie contents)
  "Interpret STATISTICS-COOKIE object as Org syntax.
CONTENTS is nil."
  (org-element-property :value statistics-cookie))

(defun org-element-statistics-cookie-successor (limit)
  "Search for the next statistics cookie object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `statistics-cookie' and
CDR is beginning position."
  (save-excursion
    (when (re-search-forward "\\[[0-9]*\\(%\\|/[0-9]*\\)\\]" limit t)
      (cons 'statistics-cookie (match-beginning 0)))))


;;;; Strike-Through

(defun org-element-strike-through-parser ()
  "Parse strike-through object at point.

Return a list whose CAR is `strike-through' and CDR is a plist
with `:begin', `:end', `:contents-begin' and `:contents-end' and
`:post-blank' keywords.

Assume point is at the first plus sign marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (contents-begin (match-beginning 4))
	  (contents-end (match-end 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(strike-through
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-strike-through-interpreter (strike-through contents)
  "Interpret STRIKE-THROUGH object as Org syntax.
CONTENTS is the contents of the object."
  (format "+%s+" contents))


;;;; Subscript

(defun org-element-subscript-parser ()
  "Parse subscript at point.

Return a list whose CAR is `subscript' and CDR a plist with
`:begin', `:end', `:contents-begin', `:contents-end',
`:use-brackets-p' and `:post-blank' as keywords.

Assume point is at the underscore."
  (save-excursion
    (unless (bolp) (backward-char))
    (let ((bracketsp (if (looking-at org-match-substring-with-braces-regexp)
			 t
		       (not (looking-at org-match-substring-regexp))))
	  (begin (match-beginning 2))
	  (contents-begin (or (match-beginning 5)
			      (match-beginning 3)))
	  (contents-end (or (match-end 5) (match-end 3)))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(subscript
	(:begin ,begin
		:end ,end
		:use-brackets-p ,bracketsp
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-subscript-interpreter (subscript contents)
  "Interpret SUBSCRIPT object as Org syntax.
CONTENTS is the contents of the object."
  (format
   (if (org-element-property :use-brackets-p subscript) "_{%s}" "_%s")
   contents))

(defun org-element-sub/superscript-successor  (limit)
  "Search for the next sub/superscript object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is either `subscript' or
`superscript' and CDR is beginning position."
  (save-excursion
    (when (re-search-forward org-match-substring-regexp limit t)
      (cons (if (string= (match-string 2) "_") 'subscript 'superscript)
	    (match-beginning 2)))))


;;;; Superscript

(defun org-element-superscript-parser ()
  "Parse superscript at point.

Return a list whose CAR is `superscript' and CDR a plist with
`:begin', `:end', `:contents-begin', `:contents-end',
`:use-brackets-p' and `:post-blank' as keywords.

Assume point is at the caret."
  (save-excursion
    (unless (bolp) (backward-char))
    (let ((bracketsp (if (looking-at org-match-substring-with-braces-regexp) t
		       (not (looking-at org-match-substring-regexp))))
	  (begin (match-beginning 2))
	  (contents-begin (or (match-beginning 5)
			      (match-beginning 3)))
	  (contents-end (or (match-end 5) (match-end 3)))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(superscript
	(:begin ,begin
		:end ,end
		:use-brackets-p ,bracketsp
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-superscript-interpreter (superscript contents)
  "Interpret SUPERSCRIPT object as Org syntax.
CONTENTS is the contents of the object."
  (format
   (if (org-element-property :use-brackets-p superscript) "^{%s}" "^%s")
   contents))


;;;; Table Cell

(defun org-element-table-cell-parser ()
  "Parse table cell at point.

Return a list whose CAR is `table-cell' and CDR is a plist
containing `:begin', `:end', `:contents-begin', `:contents-end'
and `:post-blank' keywords."
  (looking-at "[ \t]*\\(.*?\\)[ \t]*|")
  (let* ((begin (match-beginning 0))
	 (end (match-end 0))
	 (contents-begin (match-beginning 1))
	 (contents-end (match-end 1)))
    `(table-cell
      (:begin ,begin
	      :end ,end
	      :contents-begin ,contents-begin
	      :contents-end ,contents-end
	      :post-blank 0))))

(defun org-element-table-cell-interpreter (table-cell contents)
  "Interpret TABLE-CELL element as Org syntax.
CONTENTS is the contents of the cell, or nil."
  (concat  " " contents " |"))

(defun org-element-table-cell-successor (limit)
  "Search for the next table-cell object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `table-cell' and CDR is
beginning position."
  (when (looking-at "[ \t]*.*?[ \t]+|") (cons 'table-cell (point))))


;;;; Target

(defun org-element-target-parser ()
  "Parse target at point.

Return a list whose CAR is `target' and CDR a plist with
`:begin', `:end', `:value' and `:post-blank' as keywords.

Assume point is at the target."
  (save-excursion
    (looking-at org-target-regexp)
    (let ((begin (point))
	  (value (org-match-string-no-properties 1))
	  (post-blank (progn (goto-char (match-end 0))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(target
	(:begin ,begin
		:end ,end
		:value ,value
		:post-blank ,post-blank)))))

(defun org-element-target-interpreter (target contents)
  "Interpret TARGET object as Org syntax.
CONTENTS is nil."
  (format "<<%s>>" (org-element-property :value target)))

(defun org-element-target-successor (limit)
  "Search for the next target object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `target' and CDR is
beginning position."
  (save-excursion
     (when (re-search-forward org-target-regexp limit t)
       (cons 'target (match-beginning 0)))))


;;;; Timestamp

(defun org-element-timestamp-parser ()
  "Parse time stamp at point.

Return a list whose CAR is `timestamp', and CDR a plist with
`:type', `:begin', `:end', `:value' and `:post-blank' keywords.

Assume point is at the beginning of the timestamp."
  (save-excursion
    (let* ((begin (point))
	   (type (cond
		  ((looking-at org-tsr-regexp)
		   (if (match-string 2) 'active-range 'active))
		  ((looking-at org-tsr-regexp-both)
		   (if (match-string 2) 'inactive-range 'inactive))
		  ((looking-at
		    (concat
		     "\\(<[0-9]+-[0-9]+-[0-9]+[^>\n]+?\\+[0-9]+[dwmy]>\\)"
		     "\\|"
		     "\\(<%%\\(([^>\n]+)\\)>\\)"))
		   'diary)))
	   (value (org-match-string-no-properties 0))
	   (post-blank (progn (goto-char (match-end 0))
			      (skip-chars-forward " \t")))
	   (end (point)))
      `(timestamp
	(:type ,type
	       :value ,value
	       :begin ,begin
	       :end ,end
	       :post-blank ,post-blank)))))

(defun org-element-timestamp-interpreter (timestamp contents)
  "Interpret TIMESTAMP object as Org syntax.
CONTENTS is nil."
  (org-element-property :value timestamp))

(defun org-element-timestamp-successor (limit)
  "Search for the next timestamp object.

LIMIT bounds the search.

Return value is a cons cell whose CAR is `timestamp' and CDR is
beginning position."
  (save-excursion
    (when (re-search-forward
	   (concat org-ts-regexp-both
		   "\\|"
		   "\\(?:<[0-9]+-[0-9]+-[0-9]+[^>\n]+?\\+[0-9]+[dwmy]>\\)"
		   "\\|"
		   "\\(?:<%%\\(?:([^>\n]+)\\)>\\)")
	   limit t)
      (cons 'timestamp (match-beginning 0)))))


;;;; Underline

(defun org-element-underline-parser ()
  "Parse underline object at point.

Return a list whose CAR is `underline' and CDR is a plist with
`:begin', `:end', `:contents-begin' and `:contents-end' and
`:post-blank' keywords.

Assume point is at the first underscore marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (contents-begin (match-beginning 4))
	  (contents-end (match-end 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(underline
	(:begin ,begin
		:end ,end
		:contents-begin ,contents-begin
		:contents-end ,contents-end
		:post-blank ,post-blank)))))

(defun org-element-underline-interpreter (underline contents)
  "Interpret UNDERLINE object as Org syntax.
CONTENTS is the contents of the object."
  (format "_%s_" contents))


;;;; Verbatim

(defun org-element-verbatim-parser ()
  "Parse verbatim object at point.

Return a list whose CAR is `verbatim' and CDR is a plist with
`:value', `:begin', `:end' and `:post-blank' keywords.

Assume point is at the first equal sign marker."
  (save-excursion
    (unless (bolp) (backward-char 1))
    (looking-at org-emph-re)
    (let ((begin (match-beginning 2))
	  (value (org-match-string-no-properties 4))
	  (post-blank (progn (goto-char (match-end 2))
			     (skip-chars-forward " \t")))
	  (end (point)))
      `(verbatim
	(:value ,value
		:begin ,begin
		:end ,end
		:post-blank ,post-blank)))))

(defun org-element-verbatim-interpreter (verbatim contents)
  "Interpret VERBATIM object as Org syntax.
CONTENTS is nil."
  (format "=%s=" (org-element-property :value verbatim)))



;;; Definitions And Rules

;; Define elements, greater elements and specify recursive objects,
;; along with the affiliated keywords recognized.  Also set up
;; restrictions on recursive objects combinations.

;; These variables really act as a control center for the parsing
;; process.
(defconst org-element-paragraph-separate
  (concat "\f" "\\|" "^[ \t]*$" "\\|"
	  ;; Headlines and inlinetasks.
	  org-outline-regexp-bol "\\|"
	  ;; Comments, blocks (any type), keywords and babel calls.
	  "^[ \t]*#\\+" "\\|" "^#\\(?: \\|$\\)" "\\|"
	  ;; Lists.
	  (org-item-beginning-re) "\\|"
	  ;; Fixed-width, drawers (any type) and tables.
	  "^[ \t]*[:|]" "\\|"
	  ;; Footnote definitions.
	  org-footnote-definition-re "\\|"
	  ;; Horizontal rules.
	  "^[ \t]*-\\{5,\\}[ \t]*$" "\\|"
	  ;; LaTeX environments.
	  "^[ \t]*\\\\\\(begin\\|end\\)"
	  ;; Planning and Clock lines.
	  "^[ \t]*\\(?:"
	  org-clock-string "\\|"
	  org-closed-string "\\|"
	  org-deadline-string "\\|"
	  org-scheduled-string "\\)")
  "Regexp to separate paragraphs in an Org buffer.")

(defconst org-element-all-elements
  '(center-block clock comment comment-block drawer dynamic-block example-block
		 export-block fixed-width footnote-definition headline
		 horizontal-rule inlinetask item keyword latex-environment
		 babel-call paragraph plain-list planning property-drawer
		 quote-block quote-section section special-block src-block table
		 table-row verse-block)
  "Complete list of element types.")

(defconst org-element-greater-elements
  '(center-block drawer dynamic-block footnote-definition headline inlinetask
		 item plain-list quote-block section special-block table)
  "List of recursive element types aka Greater Elements.")

(defconst org-element-all-successors
  '(export-snippet footnote-reference inline-babel-call inline-src-block
		   latex-or-entity line-break link macro radio-target
		   statistics-cookie sub/superscript table-cell target
		   text-markup timestamp)
  "Complete list of successors.")

(defconst org-element-object-successor-alist
  '((subscript . sub/superscript) (superscript . sub/superscript)
    (bold . text-markup) (code . text-markup) (italic . text-markup)
    (strike-through . text-markup) (underline . text-markup)
    (verbatim . text-markup) (entity . latex-or-entity)
    (latex-fragment . latex-or-entity))
  "Alist of translations between object type and successor name.

Sharing the same successor comes handy when, for example, the
regexp matching one object can also match the other object.")

(defconst org-element-all-objects
  '(bold code entity export-snippet footnote-reference inline-babel-call
	 inline-src-block italic line-break latex-fragment link macro
	 radio-target statistics-cookie strike-through subscript superscript
	 table-cell target timestamp underline verbatim)
  "Complete list of object types.")

(defconst org-element-recursive-objects
  '(bold italic link macro subscript radio-target strike-through superscript
	 table-cell underline)
  "List of recursive object types.")

(defconst org-element-block-name-alist
  '(("ASCII" . export-block)
    ("CENTER" . center-block)
    ("COMMENT" . comment-block)
    ("DOCBOOK" . export-block)
    ("EXAMPLE" . example-block)
    ("HTML" . export-block)
    ("LATEX" . export-block)
    ("ODT" . export-block)
    ("QUOTE" . quote-block)
    ("SRC" . src-block)
    ("VERSE" . verse-block))
  "Alist between block names and their element type.
Any block whose name has no association in the current list has
a `special-block' type.")

(defconst org-element-affiliated-keywords
  '("ATTR_ASCII" "ATTR_DOCBOOK" "ATTR_HTML" "ATTR_LATEX" "ATTR_ODT" "CAPTION"
    "DATA" "HEADER" "HEADERS" "LABEL" "NAME" "PLOT" "RESNAME" "RESULT" "RESULTS"
    "SOURCE" "SRCNAME" "TBLNAME")
  "List of affiliated keywords as strings.")

(defconst org-element-keyword-translation-alist
  '(("DATA" . "NAME")  ("LABEL" . "NAME") ("RESNAME" . "NAME")
    ("SOURCE" . "NAME") ("SRCNAME" . "NAME") ("TBLNAME" . "NAME")
    ("RESULT" . "RESULTS") ("HEADERS" . "HEADER"))
  "Alist of usual translations for keywords.
The key is the old name and the value the new one.  The property
holding their value will be named after the translated name.")

(defconst org-element-multiple-keywords
  '("ATTR_ASCII" "ATTR_DOCBOOK" "ATTR_HTML" "ATTR_LATEX" "ATTR_ODT" "HEADER")
  "List of affiliated keywords that can occur more that once in an element.

Their value will be consed into a list of strings, which will be
returned as the value of the property.

This list is checked after translations have been applied.  See
`org-element-keyword-translation-alist'.")

(defconst org-element-parsed-keywords '("AUTHOR" "CAPTION" "TITLE")
  "List of keywords whose value can be parsed.

Their value will be stored as a secondary string: a list of
strings and objects.

This list is checked after translations have been applied.  See
`org-element-keyword-translation-alist'.")

(defconst org-element-dual-keywords '("CAPTION" "RESULTS")
  "List of keywords which can have a secondary value.

In Org syntax, they can be written with optional square brackets
before the colons.  For example, results keyword can be
associated to a hash value with the following:

  #+RESULTS[hash-string]: some-source

This list is checked after translations have been applied.  See
`org-element-keyword-translation-alist'.")

(defconst org-element-object-restrictions
  `((bold entity export-snippet inline-babel-call inline-src-block link
	  radio-target sub/superscript target text-markup timestamp)
    (footnote-reference entity export-snippet footnote-reference
			inline-babel-call inline-src-block latex-fragment
			line-break link macro radio-target sub/superscript
			target text-markup timestamp)
    (headline entity inline-babel-call inline-src-block latex-fragment link
	      macro radio-target statistics-cookie sub/superscript text-markup
	      timestamp)
    (inlinetask entity inline-babel-call inline-src-block latex-fragment link
		macro radio-target sub/superscript text-markup timestamp)
    (italic entity export-snippet inline-babel-call inline-src-block link
	    radio-target sub/superscript target text-markup timestamp)
    (item entity inline-babel-call latex-fragment macro radio-target
	  sub/superscript target text-markup)
    (keyword entity latex-fragment macro sub/superscript text-markup)
    (link entity export-snippet inline-babel-call inline-src-block
	  latex-fragment link sub/superscript text-markup)
    (macro macro)
    (paragraph ,@org-element-all-successors)
    (radio-target entity export-snippet latex-fragment sub/superscript)
    (strike-through entity export-snippet inline-babel-call inline-src-block
		    link radio-target sub/superscript target text-markup
		    timestamp)
    (subscript entity export-snippet inline-babel-call inline-src-block
	       latex-fragment sub/superscript text-markup)
    (superscript entity export-snippet inline-babel-call inline-src-block
		 latex-fragment sub/superscript text-markup)
    (table-cell entity export-snippet latex-fragment link macro radio-target
		sub/superscript target text-markup timestamp)
    (table-row table-cell)
    (underline entity export-snippet inline-babel-call inline-src-block link
	       radio-target sub/superscript target text-markup timestamp)
    (verse-block entity footnote-reference inline-babel-call inline-src-block
		 latex-fragment line-break link macro radio-target
		 sub/superscript target text-markup timestamp))
  "Alist of objects restrictions.

CAR is an element or object type containing objects and CDR is
a list of successors that will be called within an element or
object of such type.

For example, in a `radio-target' object, one can only find
entities, export snippets, latex-fragments, subscript and
superscript.

This alist also applies to secondary string.  For example, an
`headline' type element doesn't directly contain objects, but
still has an entry since one of its properties (`:title') does.")

(defconst org-element-secondary-value-alist
  '((headline . :title)
    (inlinetask . :title)
    (item . :tag)
    (footnote-reference . :inline-definition))
  "Alist between element types and location of secondary value.")



;;; Accessors
;;
;; Provide four accessors: `org-element-type', `org-element-property'
;; `org-element-contents' and `org-element-restriction'.

(defun org-element-type (element)
  "Return type of element ELEMENT.

The function returns the type of the element or object provided.
It can also return the following special value:
  `plain-text'       for a string
  `org-data'         for a complete document
  nil                in any other case."
  (cond
   ((not (consp element)) (and (stringp element) 'plain-text))
   ((symbolp (car element)) (car element))))

(defun org-element-property (property element)
  "Extract the value from the PROPERTY of an ELEMENT."
  (plist-get (nth 1 element) property))

(defun org-element-contents (element)
  "Extract contents from an ELEMENT."
  (and (consp element) (nthcdr 2 element)))

(defun org-element-restriction (element)
  "Return restriction associated to ELEMENT.
ELEMENT can be an element, an object or a symbol representing an
element or object type."
  (cdr (assq (if (symbolp element) element (org-element-type element))
	     org-element-object-restrictions)))



;;; Parsing Element Starting At Point
;;
;; `org-element-current-element' is the core function of this section.
;; It returns the Lisp representation of the element starting at
;; point.  It uses `org-element--element-block-re' for quick access to
;; a common regexp.
;;
;; `org-element-current-element' makes use of special modes.  They are
;; activated for fixed element chaining (i.e. `plain-list' > `item')
;; or fixed conditional element chaining (i.e. `headline' >
;; `section'). Special modes are: `section', `quote-section', `item'
;; and `table-row'.

(defconst org-element--element-block-re
  (format "[ \t]*#\\+BEGIN_\\(%s\\)\\(?: \\|$\\)"
          (mapconcat
           'regexp-quote
           (mapcar 'car org-element-non-recursive-block-alist) "\\|"))
  "Regexp matching the beginning of a non-recursive block type.
Used internally by `org-element-current-element'.")

(defun org-element-current-element (&optional granularity special structure)
  "Parse the element starting at point.

Return value is a list like (TYPE PROPS) where TYPE is the type
of the element and PROPS a plist of properties associated to the
element.

Possible types are defined in `org-element-all-elements'.

Optional argument GRANULARITY determines the depth of the
recursion.  Allowed values are `headline', `greater-element',
`element', `object' or nil.  When it is broader than `object' (or
nil), secondary values will not be parsed, since they only
contain objects.

Optional argument SPECIAL, when non-nil, can be either `section',
`quote-section', `table-row' and `item'.

If STRUCTURE isn't provided but SPECIAL is set to `item', it will
be computed.

This function assumes point is always at the beginning of the
element it has to parse."
  (save-excursion
    ;; If point is at an affiliated keyword, try moving to the
    ;; beginning of the associated element.  If none is found, the
    ;; keyword is orphaned and will be treated as plain text.
    (when (looking-at org-element--affiliated-re)
      (let ((opoint (point)))
        (while (looking-at org-element--affiliated-re) (forward-line))
        (when (looking-at "[ \t]*$") (goto-char opoint))))
    (let ((case-fold-search t)
	  ;; Determine if parsing depth allows for secondary strings
	  ;; parsing.  It only applies to elements referenced in
	  ;; `org-element-secondary-value-alist'.
	  (raw-secondary-p (and granularity (not (eq granularity 'object)))))
      (cond
       ;; Item.
       ((eq special 'item)
	(org-element-item-parser (or structure (org-list-struct))
				 raw-secondary-p))
       ;; Quote Section.
       ((eq special 'quote-section) (org-element-quote-section-parser))
       ;; Table Row.
       ((eq special 'table-row) (org-element-table-row-parser))
       ;; Headline.
       ((org-with-limited-levels (org-at-heading-p))
        (org-element-headline-parser raw-secondary-p))
       ;; Section (must be checked after headline).
       ((eq special 'section) (org-element-section-parser))
       ;; Planning and Clock.
       ((and (looking-at org-planning-or-clock-line-re))
	(if (equal (match-string 1) org-clock-string)
	    (org-element-clock-parser)
	  (org-element-planning-parser)))
       ;; Blocks.
       ((when (looking-at "[ \t]*#\\+BEGIN_\\([-A-Za-z0-9]+\\)\\(?: \\|$\\)")
          (let ((name (upcase (match-string 1))) type)
            (cond
	     ((not (save-excursion
		     (re-search-forward
		      (format "^[ \t]*#\\+END_%s\\(?: \\|$\\)" name) nil t)))
	      (org-element-paragraph-parser))
	     ((setq type (assoc name org-element-block-name-alist))
	      (funcall (intern (format "org-element-%s-parser" (cdr type)))))
	     (t (org-element-special-block-parser))))))
       ;; Inlinetask.
       ((org-at-heading-p) (org-element-inlinetask-parser raw-secondary-p))
       ;; LaTeX Environment.
       ((looking-at "[ \t]*\\\\begin{")
        (if (save-excursion
              (re-search-forward "[ \t]*\\\\end{[^}]*}[ \t]*" nil t))
            (org-element-latex-environment-parser)
          (org-element-paragraph-parser)))
       ;; Drawer and Property Drawer.
       ((looking-at org-drawer-regexp)
        (let ((name (match-string 1)))
	  (cond
	   ((not (save-excursion (re-search-forward "^[ \t]*:END:[ \t]*$" nil t)))
	    (org-element-paragraph-parser))
	   ((equal "PROPERTIES" name) (org-element-property-drawer-parser))
	   (t (org-element-drawer-parser)))))
       ;; Fixed Width
       ((looking-at "[ \t]*:\\( \\|$\\)") (org-element-fixed-width-parser))
       ;; Babel Call, Dynamic Block and Keyword.
       ((looking-at "[ \t]*#\\+\\([a-z]+\\(:?_[a-z]+\\)*\\):")
        (let ((key (upcase (match-string 1))))
          (cond
	   ((equal key "CALL") (org-element-babel-call-parser))
	   ((and (equal key "BEGIN")
		 (save-excursion
		   (re-search-forward "^[ \t]*#\\+END:\\(?: \\|$\\)" nil t)))
	    (org-element-dynamic-block-parser))
	   ((and (not (equal key "TBLFM"))
		 (not (member key org-element-affiliated-keywords)))
	    (org-element-keyword-parser))
	   (t (org-element-paragraph-parser)))))
       ;; Footnote Definition.
       ((looking-at org-footnote-definition-re)
        (org-element-footnote-definition-parser))
       ;; Comment.
       ((looking-at "\\(#\\|[ \t]*#\\+\\(?: \\|$\\)\\)")
	(org-element-comment-parser))
       ;; Horizontal Rule.
       ((looking-at "[ \t]*-\\{5,\\}[ \t]*$")
        (org-element-horizontal-rule-parser))
       ;; Table.
       ((org-at-table-p t) (org-element-table-parser))
       ;; List.
       ((looking-at (org-item-re))
        (org-element-plain-list-parser (or structure (org-list-struct))))
       ;; Default element: Paragraph.
       (t (org-element-paragraph-parser))))))


;; Most elements can have affiliated keywords.  When looking for an
;; element beginning, we want to move before them, as they belong to
;; that element, and, in the meantime, collect information they give
;; into appropriate properties.  Hence the following function.

;; Usage of optional arguments may not be obvious at first glance:

;; - TRANS-LIST is used to polish keywords names that have evolved
;;   during Org history.  In example, even though =result= and
;;   =results= coexist, we want to have them under the same =result=
;;   property.  It's also true for "srcname" and "name", where the
;;   latter seems to be preferred nowadays (thus the "name" property).

;; - CONSED allows to regroup multi-lines keywords under the same
;;   property, while preserving their own identity.  This is mostly
;;   used for "attr_latex" and al.

;; - PARSED prepares a keyword value for export.  This is useful for
;;   "caption".  Objects restrictions for such keywords are defined in
;;   `org-element-object-restrictions'.

;; - DUALS is used to take care of keywords accepting a main and an
;;   optional secondary values.  For example "results" has its
;;   source's name as the main value, and may have an hash string in
;;   optional square brackets as the secondary one.

;; A keyword may belong to more than one category.

(defconst org-element--affiliated-re
  (format "[ \t]*#\\+\\(%s\\):"
	  (mapconcat
	   (lambda (keyword)
	     (if (member keyword org-element-dual-keywords)
		 (format "\\(%s\\)\\(?:\\[\\(.*\\)\\]\\)?"
			 (regexp-quote keyword))
	       (regexp-quote keyword)))
	   org-element-affiliated-keywords "\\|"))
  "Regexp matching any affiliated keyword.

Keyword name is put in match group 1.  Moreover, if keyword
belongs to `org-element-dual-keywords', put the dual value in
match group 2.

Don't modify it, set `org-element-affiliated-keywords' instead.")

(defun org-element-collect-affiliated-keywords (&optional key-re trans-list
							  consed parsed duals)
  "Collect affiliated keywords before point.

Optional argument KEY-RE is a regexp matching keywords, which
puts matched keyword in group 1.  It defaults to
`org-element--affiliated-re'.

TRANS-LIST is an alist where key is the keyword and value the
property name it should be translated to, without the colons.  It
defaults to `org-element-keyword-translation-alist'.

CONSED is a list of strings.  Any keyword belonging to that list
will have its value consed.  The check is done after keyword
translation.  It defaults to `org-element-multiple-keywords'.

PARSED is a list of strings.  Any keyword member of this list
will have its value parsed.  The check is done after keyword
translation.  If a keyword is a member of both CONSED and PARSED,
it's value will be a list of parsed strings.  It defaults to
`org-element-parsed-keywords'.

DUALS is a list of strings.  Any keyword member of this list can
have two parts: one mandatory and one optional.  Its value is
a cons cell whose car is the former, and the cdr the latter.  If
a keyword is a member of both PARSED and DUALS, both values will
be parsed.  It defaults to `org-element-dual-keywords'.

Return a list whose car is the position at the first of them and
cdr a plist of keywords and values."
  (save-excursion
    (let ((case-fold-search t)
	  (key-re (or key-re org-element--affiliated-re))
	  (trans-list (or trans-list org-element-keyword-translation-alist))
	  (consed (or consed org-element-multiple-keywords))
	  (parsed (or parsed org-element-parsed-keywords))
	  (duals (or duals org-element-dual-keywords))
	  ;; RESTRICT is the list of objects allowed in parsed
	  ;; keywords value.
	  (restrict (org-element-restriction 'keyword))
	  output)
      (unless (bobp)
	(while (and (not (bobp))
		    (progn (forward-line -1) (looking-at key-re)))
	  (let* ((raw-kwd (upcase (or (match-string 2) (match-string 1))))
		 ;; Apply translation to RAW-KWD.  From there, KWD is
		 ;; the official keyword.
		 (kwd (or (cdr (assoc raw-kwd trans-list)) raw-kwd))
		 ;; Find main value for any keyword.
		 (value
		  (save-match-data
		    (org-trim
		     (buffer-substring-no-properties
		      (match-end 0) (point-at-eol)))))
		 ;; If KWD is a dual keyword, find its secondary
		 ;; value.  Maybe parse it.
		 (dual-value
		  (and (member kwd duals)
		       (let ((sec (org-match-string-no-properties 3)))
			 (if (or (not sec) (not (member kwd parsed))) sec
			   (org-element-parse-secondary-string sec restrict)))))
		 ;; Attribute a property name to KWD.
		 (kwd-sym (and kwd (intern (concat ":" (downcase kwd))))))
	    ;; Now set final shape for VALUE.
	    (when (member kwd parsed)
	      (setq value (org-element-parse-secondary-string value restrict)))
	    (when (member kwd duals)
	      ;; VALUE is mandatory.  Set it to nil if there is none.
	      (setq value (and value (cons value dual-value))))
	    (when (member kwd consed)
	      (setq value (cons value (plist-get output kwd-sym))))
	    ;; Eventually store the new value in OUTPUT.
	    (setq output (plist-put output kwd-sym value))))
	(unless (looking-at key-re) (forward-line 1)))
      (list (point) output))))



;;; The Org Parser

;; The two major functions here are `org-element-parse-buffer', which
;; parses Org syntax inside the current buffer, taking into account
;; region, narrowing, or even visibility if specified, and
;; `org-element-parse-secondary-string', which parses objects within
;; a given string.

;; The (almost) almighty `org-element-map' allows to apply a function
;; on elements or objects matching some type, and accumulate the
;; resulting values.  In an export situation, it also skips unneeded
;; parts of the parse tree.

(defun org-element-parse-buffer (&optional granularity visible-only)
  "Recursively parse the buffer and return structure.
If narrowing is in effect, only parse the visible part of the
buffer.

Optional argument GRANULARITY determines the depth of the
recursion.  It can be set to the following symbols:

`headline'          Only parse headlines.
`greater-element'   Don't recurse into greater elements excepted
		    headlines and sections.  Thus, elements
		    parsed are the top-level ones.
`element'           Parse everything but objects and plain text.
`object'            Parse the complete buffer (default).

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

Assume buffer is in Org mode."
  (save-excursion
    (goto-char (point-min))
    (org-skip-whitespace)
    (nconc (list 'org-data nil)
	   (org-element-parse-elements
	    (point-at-bol) (point-max)
	    ;; Start in `section' mode so text before the first
	    ;; headline belongs to a section.
	    'section nil granularity visible-only nil))))

(defun org-element-parse-secondary-string (string restriction)
  "Recursively parse objects in STRING and return structure.

RESTRICTION, when non-nil, is a symbol limiting the object types
that will be looked after."
  (with-temp-buffer
    (insert string)
    (org-element-parse-objects (point-min) (point-max) nil restriction)))

(defun org-element-map (data types fun &optional info first-match no-recursion)
  "Map a function on selected elements or objects.

DATA is the parsed tree, as returned by, i.e,
`org-element-parse-buffer'.  TYPES is a symbol or list of symbols
of elements or objects types.  FUN is the function called on the
matching element or object.  It must accept one arguments: the
element or object itself.

When optional argument INFO is non-nil, it should be a plist
holding export options.  In that case, parts of the parse tree
not exportable according to that property list will be skipped.

When optional argument FIRST-MATCH is non-nil, stop at the first
match for which FUN doesn't return nil, and return that value.

Optional argument NO-RECURSION is a symbol or a list of symbols
representing elements or objects types.  `org-element-map' won't
enter any recursive element or object whose type belongs to that
list.  Though, FUN can still be applied on them.

Nil values returned from FUN do not appear in the results."
  ;; Ensure TYPES and NO-RECURSION are a list, even of one element.
  (unless (listp types) (setq types (list types)))
  (unless (listp no-recursion) (setq no-recursion (list no-recursion)))
  ;; Recursion depth is determined by --CATEGORY.
  (let* ((--category
	  (cond
	   ((loop for type in types
		  always (memq type org-element-greater-elements))
	    'greater-elements)
	   ((loop for type in types
		  always (memq type org-element-all-elements))
	    'elements)
	   (t 'objects)))
	 ;; --RESTRICTS is a list of element types whose secondary
	 ;; string could possibly contain an object with a type among
	 ;; TYPES.
	 (--restricts
	  (and (eq --category 'objects)
	       (loop for el in org-element-secondary-value-alist
		     when
		     (loop for o in types
			   thereis (memq o (org-element-restriction (car el))))
		     collect (car el))))
	 --acc
	 (--walk-tree
	  (function
	   (lambda (--data)
	     ;; Recursively walk DATA.  INFO, if non-nil, is
	     ;; a plist holding contextual information.
	     (mapc
	      (lambda (--blob)
		(unless (and info (member --blob (plist-get info :ignore-list)))
		  (let ((--type (org-element-type --blob)))
		    ;; Check if TYPE is matching among TYPES.  If so,
		    ;; apply FUN to --BLOB and accumulate return value
		    ;; into --ACC (or exit if FIRST-MATCH is non-nil).
		    (when (memq --type types)
		      (let ((result (funcall fun --blob)))
			(cond ((not result))
			      (first-match (throw 'first-match result))
			      (t (push result --acc)))))
		    ;; If --BLOB has a secondary string that can
		    ;; contain objects with their type among TYPES,
		    ;; look into that string.
		    (when (memq --type --restricts)
		      (funcall
		       --walk-tree
		       `(org-data
			 nil
			 ,@(org-element-property
			    (cdr (assq --type org-element-secondary-value-alist))
			    --blob))))
		    ;; Now determine if a recursion into --BLOB is
		    ;; possible.  If so, do it.
		    (unless (memq --type no-recursion)
		      (when (or (and (memq --type org-element-greater-elements)
				     (not (eq --category 'greater-elements)))
				(and (memq --type org-element-all-elements)
				     (not (eq --category 'elements)))
				(org-element-contents --blob))
			(funcall --walk-tree --blob))))))
	      (org-element-contents --data))))))
    (catch 'first-match
      (funcall --walk-tree data)
      ;; Return value in a proper order.
      (nreverse --acc))))

;; The following functions are internal parts of the parser.

;; The first one, `org-element-parse-elements' acts at the element's
;; level.

;; The second one, `org-element-parse-objects' applies on all objects
;; of a paragraph or a secondary string.  It uses
;; `org-element-get-candidates' to optimize the search of the next
;; object in the buffer.

;; More precisely, that function looks for every allowed object type
;; first.  Then, it discards failed searches, keeps further matches,
;; and searches again types matched behind point, for subsequent
;; calls.  Thus, searching for a given type fails only once, and every
;; object is searched only once at top level (but sometimes more for
;; nested types).

(defun org-element-parse-elements
  (beg end special structure granularity visible-only acc)
  "Parse elements between BEG and END positions.

SPECIAL prioritize some elements over the others.  It can be set
to `quote-section', `section' `item' or `table-row'.

When value is `item', STRUCTURE will be used as the current list
structure.

GRANULARITY determines the depth of the recursion.  See
`org-element-parse-buffer' for more information.

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

Elements are accumulated into ACC."
  (save-excursion
    (save-restriction
      (narrow-to-region beg end)
      (goto-char beg)
      ;; When parsing only headlines, skip any text before first one.
      (when (and (eq granularity 'headline) (not (org-at-heading-p)))
	(org-with-limited-levels (outline-next-heading)))
      ;; Main loop start.
      (while (not (eobp))
	(push
	 ;; Find current element's type and parse it accordingly to
	 ;; its category.
	 (let* ((element (org-element-current-element
			  granularity special structure))
		(type (org-element-type element))
		(cbeg (org-element-property :contents-begin element)))
	   (goto-char (org-element-property :end element))
	   (cond
	    ;; Case 1.  Simply accumulate element if VISIBLE-ONLY is
	    ;; true and element is hidden or if it has no contents
	    ;; anyway.
	    ((or (and visible-only (org-element-property :hiddenp element))
		 (not cbeg)) element)
	    ;; Case 2.  Greater element: parse it between
	    ;; `contents-begin' and `contents-end'.  Make sure
	    ;; GRANULARITY allows the recursion, or ELEMENT is an
	    ;; headline, in which case going inside is mandatory, in
	    ;; order to get sub-level headings.
	    ((and (memq type org-element-greater-elements)
		  (or (memq granularity '(element object nil))
		      (and (eq granularity 'greater-element)
			   (eq type 'section))
		      (eq type 'headline)))
	     (org-element-parse-elements
	      cbeg (org-element-property :contents-end element)
	      ;; Possibly switch to a special mode.
	      (case type
		(headline
		 (if (org-element-property :quotedp element) 'quote-section
		   'section))
		(plain-list 'item)
		(table 'table-row))
	      (org-element-property :structure element)
	      granularity visible-only (nreverse element)))
	    ;; Case 3.  ELEMENT has contents.  Parse objects inside,
	    ;; if GRANULARITY allows it.
	    ((and cbeg (memq granularity '(object nil)))
	     (org-element-parse-objects
	      cbeg (org-element-property :contents-end element)
	      (nreverse element) (org-element-restriction type)))
	    ;; Case 4.  Else, just accumulate ELEMENT.
	    (t element)))
	 acc)))
    ;; Return result.
    (nreverse acc)))

(defun org-element-parse-objects (beg end acc restriction)
  "Parse objects between BEG and END and return recursive structure.

Objects are accumulated in ACC.

RESTRICTION is a list of object types which are allowed in the
current object."
  (let ((get-next-object
	 (function
	  (lambda (cand)
	    ;; Return the parsing function associated to the nearest
	    ;; object among list of candidates CAND.
	    (let ((pos (apply 'min (mapcar 'cdr cand))))
	      (save-excursion
		(goto-char pos)
		(funcall
		 (intern
		  (format "org-element-%s-parser" (car (rassq pos cand))))))))))
	next-object candidates)
    (save-excursion
      (goto-char beg)
      (while (setq candidates (org-element-get-next-object-candidates
			       end restriction candidates))
	(setq next-object (funcall get-next-object candidates))
	;; 1. Text before any object.  Untabify it.
	(let ((obj-beg (org-element-property :begin next-object)))
	  (unless (= (point) obj-beg)
	    (push (replace-regexp-in-string
		   "\t" (make-string tab-width ? )
		   (buffer-substring-no-properties (point) obj-beg))
		  acc)))
	;; 2. Object...
	(let ((obj-end (org-element-property :end next-object))
	      (cont-beg (org-element-property :contents-begin next-object)))
	  (push (if (and (memq (car next-object) org-element-recursive-objects)
			 cont-beg)
		    ;; ... recursive.  The CONT-BEG check is for
		    ;; links, as some of them might not be recursive
		    ;; (i.e. plain links).
		    (save-restriction
		      (narrow-to-region
		       cont-beg
		       (org-element-property :contents-end next-object))
		      (org-element-parse-objects
		       (point-min) (point-max)
		       (nreverse next-object)
		       ;; Restrict allowed objects.
		       (org-element-restriction next-object)))
		  ;; ... not recursive.  Accumulate the object.
		  next-object)
		acc)
	  (goto-char obj-end)))
      ;; 3. Text after last object.  Untabify it.
      (unless (= (point) end)
	(push (replace-regexp-in-string
	       "\t" (make-string tab-width ? )
	       (buffer-substring-no-properties (point) end))
	      acc))
      ;; Result.
      (nreverse acc))))

(defun org-element-get-next-object-candidates (limit restriction objects)
  "Return an alist of candidates for the next object.

LIMIT bounds the search, and RESTRICTION narrows candidates to
some object types.

Return value is an alist whose CAR is position and CDR the object
type, as a symbol.

OBJECTS is the previous candidates alist."
  (let (next-candidates types-to-search)
    ;; If no previous result, search every object type in RESTRICTION.
    ;; Otherwise, keep potential candidates (old objects located after
    ;; point) and ask to search again those which had matched before.
    (if (not objects) (setq types-to-search restriction)
      (mapc (lambda (obj)
	      (if (< (cdr obj) (point)) (push (car obj) types-to-search)
		(push obj next-candidates)))
	    objects))
    ;; Call the appropriate successor function for each type to search
    ;; and accumulate matches.
    (mapc
     (lambda (type)
       (let* ((successor-fun
	       (intern
		(format "org-element-%s-successor"
			(or (cdr (assq type org-element-object-successor-alist))
			    type))))
	      (obj (funcall successor-fun limit)))
	 (and obj (push obj next-candidates))))
     types-to-search)
    ;; Return alist.
    next-candidates))



;;; Towards A Bijective Process

;; The parse tree obtained with `org-element-parse-buffer' is really
;; a snapshot of the corresponding Org buffer.  Therefore, it can be
;; interpreted and expanded into a string with canonical Org syntax.
;; Hence `org-element-interpret-data'.
;;
;; The function relies internally on
;; `org-element-interpret--affiliated-keywords'.

(defun org-element-interpret-data (data &optional parent)
  "Interpret DATA as Org syntax.

DATA is a parse tree, an element, an object or a secondary string
to interpret.

Optional argument PARENT is used for recursive calls. It contains
the element or object containing data, or nil.

Return Org syntax as a string."
  (let* ((type (org-element-type data))
	 (results
	  (cond
	   ;; Secondary string.
	   ((not type)
	    (mapconcat
	     (lambda (obj) (org-element-interpret-data obj parent))
	     data ""))
	   ;; Full Org document.
	   ((eq type 'org-data)
	    (mapconcat
	     (lambda (obj) (org-element-interpret-data obj parent))
	     (org-element-contents data) ""))
	   ;; Plain text.
	   ((stringp data) data)
	   ;; Element/Object without contents.
	   ((not (org-element-contents data))
	    (funcall (intern (format "org-element-%s-interpreter" type))
		     data nil))
	   ;; Element/Object with contents.
	   (t
	    (let* ((greaterp (memq type org-element-greater-elements))
		   (objectp (and (not greaterp)
				 (memq type org-element-recursive-objects)))
		   (contents
		    (mapconcat
		     (lambda (obj) (org-element-interpret-data obj data))
		     (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 first paragraph of an
			 ;; item or a footnote-definition, ignore
			 ;; first line's indentation.
			 (and (eq type 'paragraph)
			      (equal data (car (org-element-contents parent)))
			      (memq (org-element-type parent)
				    '(footnote-definiton item))))))
		     "")))
	      (funcall (intern (format "org-element-%s-interpreter" type))
		       data
		       (if greaterp (org-element-normalize-contents contents)
			 contents)))))))
    (if (memq type '(org-data plain-text nil)) results
      ;; Build white spaces.  If no `:post-blank' property is
      ;; specified, assume its value is 0.
      (let ((post-blank (or (org-element-property :post-blank data) 0)))
	(if (memq type org-element-all-objects)
	    (concat results (make-string post-blank 32))
	  (concat
	   (org-element-interpret--affiliated-keywords data)
	   (org-element-normalize-string results)
	   (make-string post-blank 10)))))))

(defun org-element-interpret--affiliated-keywords (element)
  "Return ELEMENT's affiliated keywords as Org syntax.
If there is no affiliated keyword, return the empty string."
  (let ((keyword-to-org
	 (function
	  (lambda (key value)
	    (let (dual)
	      (when (member key org-element-dual-keywords)
		(setq dual (cdr value) value (car value)))
	      (concat "#+" key
		      (and dual
			   (format "[%s]" (org-element-interpret-data dual)))
		      ": "
		      (if (member key org-element-parsed-keywords)
			  (org-element-interpret-data value)
			value)
		      "\n"))))))
    (mapconcat
     (lambda (key)
       (let ((value (org-element-property (intern (concat ":" (downcase key)))
					  element)))
	 (when value
	   (if (member key org-element-multiple-keywords)
	       (mapconcat (lambda (line)
			    (funcall keyword-to-org key line))
			  value "")
	     (funcall keyword-to-org key value)))))
     ;; Remove translated keywords.
     (delq nil
	   (mapcar
	    (lambda (key)
	      (and (not (assoc key org-element-keyword-translation-alist)) key))
	    org-element-affiliated-keywords))
     "")))

;; Because interpretation of the parse tree must return the same
;; number of blank lines between elements and the same number of white
;; space after objects, some special care must be given to white
;; spaces.
;;
;; The first function, `org-element-normalize-string', ensures any
;; string different from the empty string will end with a single
;; newline character.
;;
;; The second function, `org-element-normalize-contents', removes
;; global indentation from the contents of the current element.

(defun org-element-normalize-string (s)
  "Ensure string S ends with a single newline character.

If S isn't a string return it unchanged.  If S is the empty
string, return it.  Otherwise, return a new string with a single
newline character at its end."
  (cond
   ((not (stringp s)) s)
   ((string= "" s) "")
   (t (and (string-match "\\(\n[ \t]*\\)*\\'" s)
	   (replace-match "\n" nil nil s)))))

(defun org-element-normalize-contents (element &optional ignore-first)
  "Normalize plain text in ELEMENT's contents.

ELEMENT must only contain plain text and objects.

If optional argument IGNORE-FIRST is non-nil, ignore first line's
indentation to compute maximal common indentation.

Return the normalized element that is element with global
indentation removed from its contents.  The function assumes that
indentation is not done with TAB characters."
  (let (ind-list
        (collect-inds
         (function
          ;; Return list of indentations within BLOB.  This is done by
          ;; walking recursively BLOB and updating IND-LIST along the
          ;; way.  FIRST-FLAG is non-nil when the first string hasn't
          ;; been seen yet.  It is required as this string is the only
          ;; one whose indentation doesn't happen after a newline
          ;; character.
          (lambda (blob first-flag)
            (mapc
             (lambda (object)
	       (when (and first-flag (stringp object))
                 (setq first-flag nil)
                 (string-match "\\`\\( *\\)" object)
		 (let ((len (length (match-string 1 object))))
		   ;; An indentation of zero means no string will be
		   ;; modified.  Quit the process.
		   (if (zerop len) (throw 'zero (setq ind-list nil))
		     (push len ind-list))))
               (cond
                ((stringp object)
                 (let ((start 0))
		   ;; Avoid matching blank or empty lines.
                   (while (and (string-match "\n\\( *\\)\\(.\\)" object start)
			       (not (equal (match-string 2 object) " ")))
                     (setq start (match-end 0))
                     (push (length (match-string 1 object)) ind-list))))
                ((memq (org-element-type object) org-element-recursive-objects)
                 (funcall collect-inds object first-flag))))
             (org-element-contents blob))))))
    ;; Collect indentation list in ELEMENT.  Possibly remove first
    ;; value if IGNORE-FIRST is non-nil.
    (catch 'zero (funcall collect-inds element (not ignore-first)))
    (if (not ind-list) element
      ;; Build ELEMENT back, replacing each string with the same
      ;; string minus common indentation.
      (let ((build
	     (function
	      (lambda (blob mci first-flag)
		;; Return BLOB with all its strings indentation
		;; shortened from MCI white spaces.  FIRST-FLAG is
		;; non-nil when the first string hasn't been seen
		;; yet.
		(nconc
		 (list (org-element-type blob) (nth 1 blob))
		 (mapcar
		  (lambda (object)
		    (when (and first-flag (stringp object))
		      (setq first-flag nil)
		      (setq object
			    (replace-regexp-in-string
			     (format "\\` \\{%d\\}" mci) "" object)))
		    (cond
		     ((stringp object)
		      (replace-regexp-in-string
		       (format "\n \\{%d\\}" mci) "\n" object))
		     ((memq (org-element-type object)
			    org-element-recursive-objects)
		      (funcall build object mci first-flag))
		     (t object)))
		  (org-element-contents blob)))))))
	(funcall build element (apply 'min ind-list) (not ignore-first))))))



;;; The Toolbox

;; The first move is to implement a way to obtain the smallest element
;; containing point.  This is the job of `org-element-at-point'.  It
;; basically jumps back to the beginning of section containing point
;; and moves, element after element, with
;; `org-element-current-element' until the container is found.
;;
;; Note: When using `org-element-at-point', secondary values are never
;; parsed since the function focuses on elements, not on objects.

(defun org-element-at-point (&optional keep-trail)
  "Determine closest element around point.

Return value is a list like (TYPE PROPS) where TYPE is the type
of the element and PROPS a plist of properties associated to the
element.  Possible types are defined in
`org-element-all-elements'.

As a special case, if point is at the very beginning of a list or
sub-list, returned element will be that list instead of the first
item.  In the same way, if point is at the beginning of the first
row of a table, returned element will be the table instead of the
first row.

If optional argument KEEP-TRAIL is non-nil, the function returns
a list of of elements leading to element at point.  The list's
CAR is always the element at point.  Its last item will be the
element's parent, unless element was either the first in its
section (in which case the last item in the list is the first
element of section) or an headline (in which case the list
contains that headline as its single element).  Elements
in-between, if any, are siblings of the element at point."
  (org-with-wide-buffer
   ;; If at an headline, parse it.  It is the sole element that
   ;; doesn't require to know about context.  Be sure to disallow
   ;; secondary string parsing, though.
   (if (org-with-limited-levels (org-at-heading-p))
       (if (not keep-trail) (org-element-headline-parser t)
	 (list (org-element-headline-parser t)))
     ;; Otherwise move at the beginning of the section containing
     ;; point.
     (let ((origin (point)) element type special-flag trail struct prevs)
       (org-with-limited-levels
	(if (org-before-first-heading-p) (goto-char (point-min))
	  (org-back-to-heading)
	  (forward-line)))
       (org-skip-whitespace)
       (beginning-of-line)
       ;; Starting parsing successively each element with
       ;; `org-element-current-element'.  Skip those ending before
       ;; original position.
       (catch 'exit
         (while t
           (setq element (org-element-current-element
			  'element special-flag struct)
                 type (car element))
	   (when keep-trail (push element trail))
           (cond
	    ;; 1. Skip any element ending before point or at point.
	    ((let ((end (org-element-property :end element)))
	       (when (<= end origin)
		 (if (> (point-max) end) (goto-char end)
		   (throw 'exit (or trail element))))))
	    ;; 2. An element containing point is always the element at
	    ;;    point.
	    ((not (memq type org-element-greater-elements))
	     (throw 'exit (if keep-trail trail element)))
	    ;; 3. At a plain list.
	    ((eq type 'plain-list)
	     (setq struct (org-element-property :structure element)
		   prevs (or prevs (org-list-prevs-alist struct)))
	     (let ((beg (org-element-property :contents-begin element)))
	       (if (<= origin beg) (throw 'exit (or trail element))
		 ;; Find the item at this level containing ORIGIN.
		 (let ((items (org-list-get-all-items beg struct prevs))
		       parent)
		   (catch 'local
		     (mapc
		      (lambda (pos)
			(cond
			 ;; Item ends before point: skip it.
			 ((<= (org-list-get-item-end pos struct) origin))
			 ;; Item contains point: store is in PARENT.
			 ((<= pos origin) (setq parent pos))
			 ;; We went too far: return PARENT.
			 (t (throw 'local nil)))) items))
		   ;; No parent: no item contained point, though the
		   ;; plain list does.  Point is in the blank lines
		   ;; after the list: return plain list.
		   (if (not parent) (throw 'exit (or trail element))
		     (setq special-flag 'item)
		     (goto-char parent))))))
	    ;; 4. At a table.
	    ((eq type 'table)
	     (if (eq (org-element-property :type element) 'table.el)
		 (throw 'exit (or trail element))
	       (let ((beg (org-element-property :contents-begin element))
		     (end (org-element-property :contents-end element)))
		 (if (or (<= origin beg) (>= origin end))
		     (throw 'exit (or trail element))
		   (when keep-trail (setq trail (list element)))
		   (setq special-flag 'table-row)
		   (narrow-to-region beg end)))))
	    ;; 4. At any other greater element type, if point is
	    ;;    within contents, move into it.  Otherwise, return
	    ;;    that element.
	    (t
	     (when (eq type 'item) (setq special-flag nil))
	     (let ((beg (org-element-property :contents-begin element))
		   (end (org-element-property :contents-end element)))
	       (if (or (not beg) (not end) (> beg origin) (< end origin))
		   (throw 'exit (or trail element))
		 ;; Reset trail, since we found a parent.
		 (when keep-trail (setq trail (list element)))
		 (narrow-to-region beg end)
		 (goto-char beg)))))))))))


;; Once the local structure around point is well understood, it's easy
;; to implement some replacements for `forward-paragraph'
;; `backward-paragraph', namely `org-element-forward' and
;; `org-element-backward'.

;; Also, `org-transpose-elements' mimics the behaviour of
;; `transpose-words', at the element's level, whereas
;; `org-element-drag-forward', `org-element-drag-backward', and
;; `org-element-up' generalize, respectively, functions
;; `org-subtree-down', `org-subtree-up' and `outline-up-heading'.

;; `org-element-unindent-buffer' will, as its name almost suggests,
;; smartly remove global indentation from buffer, making it possible
;; to use Org indent mode on a file created with hard indentation.

;; `org-element-nested-p' and `org-element-swap-A-B' are used
;; internally by some of the previously cited tools.

(defsubst org-element-nested-p (elem-A elem-B)
  "Non-nil when elements ELEM-A and ELEM-B are nested."
  (let ((beg-A (org-element-property :begin elem-A))
	(beg-B (org-element-property :begin elem-B))
	(end-A (org-element-property :end elem-A))
	(end-B (org-element-property :end elem-B)))
    (or (and (>= beg-A beg-B) (<= end-A end-B))
	(and (>= beg-B beg-A) (<= end-B end-A)))))

(defun org-element-swap-A-B (elem-A elem-B)
  "Swap elements ELEM-A and ELEM-B.

Leave point at the end of ELEM-A."
  (goto-char (org-element-property :begin elem-A))
  (let* ((beg-A (org-element-property :begin elem-A))
	 (end-A (save-excursion
		  (goto-char (org-element-property :end elem-A))
		  (skip-chars-backward " \r\t\n")
		  (point-at-eol)))
	 (beg-B (org-element-property :begin elem-B))
	 (end-B (save-excursion
		  (goto-char (org-element-property :end elem-B))
		  (skip-chars-backward " \r\t\n")
		  (point-at-eol)))
	 (body-A (buffer-substring beg-A end-A))
	 (body-B (delete-and-extract-region beg-B end-B)))
    (goto-char beg-B)
    (insert body-A)
    (goto-char beg-A)
    (delete-region beg-A end-A)
    (insert body-B)
    (goto-char (org-element-property :end elem-B))))

(defun org-element-backward ()
  "Move backward by one element.
Move to the previous element at the same level, when possible."
  (interactive)
  (if (save-excursion (skip-chars-backward " \r\t\n") (bobp))
      (error "Cannot move further up")
    (let* ((trail (org-element-at-point 'keep-trail))
	   (element (car trail))
	   (beg (org-element-property :begin element)))
      ;; Move to beginning of current element if point isn't there.
      (if (/= (point) beg) (goto-char beg)
	(let ((type (org-element-type element)))
	  (cond
	   ;; At an headline: move to previous headline at the same
	   ;; level, a parent, or BOB.
	   ((eq type 'headline)
	    (let ((dest (save-excursion (org-backward-same-level 1) (point))))
	      (if (= (point-min) dest) (error "Cannot move further up")
		(goto-char dest))))
	   ;; At an item: try to move to the previous item, if any.
	   ((and (eq type 'item)
		 (let* ((struct (org-element-property :structure element))
			(prev (org-list-get-prev-item
			       beg struct (org-list-prevs-alist struct))))
		   (when prev (goto-char prev)))))
	   ;; In any other case, find the previous element in the
	   ;; trail and move to its beginning.  If no previous element
	   ;; can be found, move to headline.
	   (t (let ((prev (nth 1 trail)))
		(if prev (goto-char (org-element-property :begin prev))
		  (org-back-to-heading))))))))))

(defun org-element-drag-backward ()
  "Drag backward element at point."
  (interactive)
  (let* ((pos (point))
	 (elem (org-element-at-point)))
    (when (= (progn (goto-char (point-min))
		    (org-skip-whitespace)
		    (point-at-bol))
	     (org-element-property :end elem))
      (error "Cannot drag element backward"))
    (goto-char (org-element-property :begin elem))
    (org-element-backward)
    (let ((prev-elem (org-element-at-point)))
      (when (or (org-element-nested-p elem prev-elem)
		(and (eq (org-element-type elem) 'headline)
		     (not (eq (org-element-type prev-elem) 'headline))))
	(goto-char pos)
	(error "Cannot drag element backward"))
      ;; Compute new position of point: it's shifted by PREV-ELEM
      ;; body's length.
      (let ((size-prev (- (org-element-property :end prev-elem)
			  (org-element-property :begin prev-elem))))
	(org-element-swap-A-B prev-elem elem)
	(goto-char (- pos size-prev))))))

(defun org-element-drag-forward ()
  "Move forward element at point."
  (interactive)
  (let* ((pos (point))
	 (elem (org-element-at-point)))
    (when (= (point-max) (org-element-property :end elem))
      (error "Cannot drag element forward"))
    (goto-char (org-element-property :end elem))
    (let ((next-elem (org-element-at-point)))
      (when (or (org-element-nested-p elem next-elem)
		(and (eq (org-element-type next-elem) 'headline)
		     (not (eq (org-element-type elem) 'headline))))
	(goto-char pos)
	(error "Cannot drag element forward"))
      ;; Compute new position of point: it's shifted by NEXT-ELEM
      ;; body's length (without final blanks) and by the length of
      ;; blanks between ELEM and NEXT-ELEM.
      (let ((size-next (- (save-excursion
			    (goto-char (org-element-property :end next-elem))
			    (skip-chars-backward " \r\t\n")
			    (forward-line)
			    (point))
			  (org-element-property :begin next-elem)))
	    (size-blank (- (org-element-property :end elem)
			   (save-excursion
			     (goto-char (org-element-property :end elem))
			     (skip-chars-backward " \r\t\n")
			     (forward-line)
			     (point)))))
	(org-element-swap-A-B elem next-elem)
	(goto-char (+ pos size-next size-blank))))))

(defun org-element-forward ()
  "Move forward by one element.
Move to the next element at the same level, when possible."
  (interactive)
  (if (eobp) (error "Cannot move further down")
    (let* ((trail (org-element-at-point 'keep-trail))
	   (element (car trail))
	   (type (org-element-type element))
	   (end (org-element-property :end element)))
      (cond
       ;; At an headline, move to next headline at the same level.
       ((eq type 'headline) (goto-char end))
       ;; At an item.  Move to the next item, if possible.
       ((and (eq type 'item)
	     (let* ((struct (org-element-property :structure element))
		    (prevs (org-list-prevs-alist struct))
		    (beg (org-element-property :begin element))
		    (next-item (org-list-get-next-item beg struct prevs)))
	       (when next-item (goto-char next-item)))))
       ;; In any other case, move to element's end, unless this
       ;; position is also the end of its parent's contents, in which
       ;; case, directly jump to parent's end.
       (t
	(let ((parent
	       ;; Determine if TRAIL contains the real parent of ELEMENT.
	       (and (> (length trail) 1)
		    (let* ((parent-candidate (car (last trail))))
		      (and (memq (org-element-type parent-candidate)
				 org-element-greater-elements)
			   (>= (org-element-property
				:contents-end parent-candidate) end)
			   parent-candidate)))))
	  (cond ((not parent) (goto-char end))
		((= (org-element-property :contents-end parent) end)
		 (goto-char (org-element-property :end parent)))
		(t (goto-char end)))))))))

(defun org-element-mark-element ()
  "Put point at beginning of this element, mark at end.

Interactively, if this command is repeated or (in Transient Mark
mode) if the mark is active, it marks the next element after the
ones already marked."
  (interactive)
  (let (deactivate-mark)
    (if (or (and (eq last-command this-command) (mark t))
	    (and transient-mark-mode mark-active))
	(set-mark
	 (save-excursion
	   (goto-char (mark))
	   (goto-char (org-element-property :end (org-element-at-point)))))
      (let ((element (org-element-at-point)))
	(end-of-line)
	(push-mark (org-element-property :end element) t t)
	(goto-char (org-element-property :begin element))))))

(defun org-narrow-to-element ()
  "Narrow buffer to current element."
  (interactive)
  (let ((elem (org-element-at-point)))
    (cond
     ((eq (car elem) 'headline)
      (narrow-to-region
       (org-element-property :begin elem)
       (org-element-property :end elem)))
     ((memq (car elem) org-element-greater-elements)
      (narrow-to-region
       (org-element-property :contents-begin elem)
       (org-element-property :contents-end elem)))
     (t
      (narrow-to-region
       (org-element-property :begin elem)
       (org-element-property :end elem))))))

(defun org-transpose-elements ()
  "Transpose current and previous elements, keeping blank lines between.
Point is moved after both elements."
  (interactive)
  (org-skip-whitespace)
  (let ((pos (point))
	(cur (org-element-at-point)))
    (when (= (save-excursion (goto-char (point-min))
			     (org-skip-whitespace)
			     (point-at-bol))
	     (org-element-property :begin cur))
      (error "No previous element"))
    (goto-char (org-element-property :begin cur))
    (forward-line -1)
    (let ((prev (org-element-at-point)))
      (when (org-element-nested-p cur prev)
	(goto-char pos)
	(error "Cannot transpose nested elements"))
      (org-element-swap-A-B prev cur))))

(defun org-element-unindent-buffer ()
  "Un-indent the visible part of the buffer.
Relative indentation \(between items, inside blocks, etc.\) isn't
modified."
  (interactive)
  (unless (eq major-mode 'org-mode)
    (error "Cannot un-indent a buffer not in Org mode"))
  (let* ((parse-tree (org-element-parse-buffer 'greater-element))
	 unindent-tree                   ; For byte-compiler.
	 (unindent-tree
	  (function
	   (lambda (contents)
	     (mapc (lambda (element)
		     (if (eq (org-element-type element) 'headline)
			 (funcall unindent-tree
				  (org-element-contents element))
		       (save-excursion
			 (save-restriction
			   (narrow-to-region
			    (org-element-property :begin element)
			    (org-element-property :end element))
			   (org-do-remove-indentation)))))
		   (reverse contents))))))
    (funcall unindent-tree (org-element-contents parse-tree))))

(defun org-element-up ()
  "Move to upper element."
  (interactive)
  (cond
   ((bobp) (error "No surrounding element"))
   ((org-with-limited-levels (org-at-heading-p))
    (or (org-up-heading-safe) (error "No surronding element")))
   (t
    (let* ((trail (org-element-at-point 'keep-trail))
	   (element (car trail))
	   (type (org-element-type element)))
      (cond
       ;; At an item, with a parent in the list: move to that parent.
       ((and (eq type 'item)
	     (let* ((beg (org-element-property :begin element))
		    (struct (org-element-property :structure element))
		    (parents (org-list-parents-alist struct))
		    (parentp (org-list-get-parent beg struct parents)))
	       (and parentp (goto-char parentp)))))
       ;; Determine parent in the trail.
       (t
	(let ((parent
	       (and (> (length trail) 1)
		    (let ((parentp (car (last trail))))
		      (and (memq (org-element-type parentp)
				 org-element-greater-elements)
			   (>= (org-element-property :contents-end parentp)
			       (org-element-property :end element))
			   parentp)))))
	  (cond
	   ;; When parent is found move to its beginning.
	   (parent (goto-char (org-element-property :begin parent)))
	   ;; If no parent was found, move to headline above, if any
	   ;; or return an error.
	   ((org-before-first-heading-p) (error "No surrounding element"))
	   (t (org-back-to-heading))))))))))

(defun org-element-down ()
  "Move to inner element."
  (interactive)
  (let ((element (org-element-at-point)))
    (cond
     ((memq (org-element-type element) '(plain-list table))
      (goto-char (org-element-property :contents-begin element))
      (forward-char))
     ((memq (org-element-type element) org-element-greater-elements)
      ;; If contents are hidden, first disclose them.
      (when (org-element-property :hiddenp element) (org-cycle))
      (goto-char (org-element-property :contents-begin element)))
     (t (error "No inner element")))))


(provide 'org-element)
;;; org-element.el ends here