org-src: Remove unused functions and variables

* lisp/org-src.el (org-edit-src-region-extra): Remove variable.
(org-edit-src-find-region-and-lang, org-edit-src-get-lang,
org-edit-src-get-label-format, org-edit-src-get-indentation,
org-src-fontify-block, org-src-fontify-buffer): Remove functions.

(org-src-font-lock-fontify-block): Remove reference to removed
function in docstring.

Remove all functions and variables related to parsing, which is now
delegated to org-element.el.  Also reorder a defcustom and
a declaration in the library.

lisp/org-src.el

@@ -46,22 +46,7 @@
 		  "org-compat" (&optional buffer-or-name norecord label))
 (declare-function org-base-buffer "org" (buffer))
 
-(defcustom org-edit-src-region-extra nil
-  "Additional regexps to identify regions for editing with `org-edit-src-code'.
-For examples see the function `org-edit-src-find-region-and-lang'.
-The regular expression identifying the begin marker should end with a newline,
-and the regexp marking the end line should start with a newline, to make sure
-there are kept outside the narrowed region."
-  :group 'org-edit-structure
-  :type '(repeat
-	  (list
-	   (regexp :tag "begin regexp")
-	   (regexp :tag "end regexp")
-	   (choice :tag "language"
-		   (string :tag "specify")
-		   (integer :tag "from match group")
-		   (const :tag "from `lang' element")
-		   (const :tag "from `style' element")))))
+(declare-function org-babel-tangle "ob-tangle" (&optional arg target-file lang))
 
 (defcustom org-edit-src-turn-on-auto-save nil
   "Non-nil means turn `auto-save-mode' on when editing a source block.
@@ -194,6 +179,13 @@ For example, there is no ocaml-mode in Emacs, but the mode to use is
 	   (string "Language name")
 	   (symbol "Major mode"))))
 
+(defcustom org-src-tab-acts-natively nil
+  "If non-nil, the effect of TAB in a code block is as if it were
+issued in the language major mode buffer."
+  :type 'boolean
+  :version "24.1"
+  :group 'org-babel)
+
 ;;; Editing source examples
 
 (defvar org-src-mode-map (make-sparse-keymap))
@@ -211,6 +203,8 @@ For example, there is no ocaml-mode in Emacs, but the mode to use is
 (defvar org-edit-src-block-indentation nil)
 (defvar org-edit-src-saved-temp-window-config nil)
 
+(defvar org-src-babel-info nil)
+
 (defcustom org-src-ask-before-returning-to-edit-buffer t
   "If nil, when org-edit-src code is used on a block that already
 has an active edit buffer, it will switch to that edit buffer
@@ -221,8 +215,6 @@ the existing edit buffer."
   :package-version '(Org . "8.0")
   :type 'boolean)
 
-(defvar org-src-babel-info nil)
-
 (define-minor-mode org-src-mode
   "Minor mode for language major mode buffers generated by org.
 This minor mode is turned on in two situations:
@@ -546,94 +538,6 @@ the fragment in the Org-mode buffer."
       (message "%s" msg)
       t)))
 
-(defun org-edit-src-find-region-and-lang ()
-  "Find the region and language for a local edit.
-Return a list with beginning and end of the region, a string representing
-the language, a switch telling if the content should be in a single line."
-  (let ((re-list
-	 (append
-	  org-edit-src-region-extra
-	  '(
-	    ("^[ \t]*#\\+begin_src\\( \\([^ \t\n]+\\)\\)?.*\n" "\n[ \t]*#\\+end_src" 2)
-	    ("^[ \t]*#\\+begin_example.*\n" "\n[ \t]*#\\+end_example" "fundamental")
-	    ("^[ \t]*#\\+html:" "\n" "html" single-line)
-	    ("^[ \t]*#\\+begin_html.*\n" "\n[ \t]*#\\+end_html" "html")
-	    ("^[ \t]*#\\+latex:" "\n" "latex" single-line)
-	    ("^[ \t]*#\\+begin_latex.*\n" "\n[ \t]*#\\+end_latex" "latex")
-	    ("^[ \t]*#\\+ascii:" "\n" "fundamental" single-line)
-	    ("^[ \t]*#\\+begin_ascii.*\n" "\n[ \t]*#\\+end_ascii" "fundamental")
-	    ("^[ \t]*#\\+macro:[ \t]+\\S-+\\( \\|$\\)"
-	     "\n" "fundamental" macro-definition)
-	    )))
-	(pos (point))
-	re1 re2 single beg end lang lfmt match-re1 ind entry)
-    (catch 'exit
-      (while (setq entry (pop re-list))
-	(setq re1 (car entry) re2 (nth 1 entry) lang (nth 2 entry)
-	      single (nth 3 entry))
-	(save-excursion
-	  (if (or (looking-at re1)
-		  (re-search-backward re1 nil t))
-	      (progn
-		(setq match-re1 (match-string 0))
-		(setq beg (match-end 0)
-		      lang (org-edit-src-get-lang lang)
-		      lfmt (org-edit-src-get-label-format match-re1)
-		      ind (org-edit-src-get-indentation (match-beginning 0)))
-		(if (and (re-search-forward re2 nil t)
-			 (>= (match-end 0) pos))
-		    (throw 'exit (list beg (match-beginning 0)
-				       lang single lfmt ind))))
-	    (if (or (looking-at re2)
-		    (re-search-forward re2 nil t))
-		(progn
-		  (setq end (match-beginning 0))
-		  (if (and (re-search-backward re1 nil t)
-			   (<= (match-beginning 0) pos))
-		      (progn
-			(setq lfmt (org-edit-src-get-label-format
-				    (match-string 0))
-			      ind (org-edit-src-get-indentation
-				   (match-beginning 0)))
-			(throw 'exit
-			       (list (match-end 0) end
-				     (org-edit-src-get-lang lang)
-				     single lfmt ind)))))))))
-      (when (org-at-table.el-p)
-	(re-search-backward "^[\t]*[^ \t|\\+]" nil t)
-	(setq beg (1+ (point-at-eol)))
-	(goto-char beg)
-	(or (re-search-forward "^[\t]*[^ \t|\\+]" nil t)
-	    (progn (goto-char (point-max)) (newline)))
-	(setq end (1- (point-at-bol)))
-	(throw 'exit (list beg end 'table.el nil nil 0))))))
-
-(defun org-edit-src-get-lang (lang)
-  "Extract the src language."
-  (let ((m (match-string 0)))
-    (cond
-     ((stringp lang) lang)
-     ((integerp lang) (match-string lang))
-     ((and (eq lang 'lang)
-	   (string-match "\\<lang=\"\\([^ \t\n\"]+\\)\"" m))
-      (match-string 1 m))
-     ((and (eq lang 'style)
-	   (string-match "\\<style=\"\\([^ \t\n\"]+\\)\"" m))
-      (match-string 1 m))
-     (t "fundamental"))))
-
-(defun org-edit-src-get-label-format (s)
-  "Extract the label format."
-  (save-match-data
-    (if (string-match "-l[ \t]+\\\\?\"\\([^\t\r\n\"]+\\)\\\\?\"" s)
-	(match-string 1 s))))
-
-(defun org-edit-src-get-indentation (pos)
-  "Count leading whitespace characters on line."
-  (save-match-data
-    (goto-char pos)
-    (org-get-indentation)))
-
 (defun org-escape-code-in-region (beg end)
   "Escape lines between BEG and END.
 Escaping happens when a line starts with \"*\", \"#+\", \",*\" or
@@ -799,8 +703,6 @@ with \",*\", \",#+\", \",,*\" and \",,#+\"."
       (user-error "Use C-c ' to save and exit, C-c C-k to abort editing")
     (org-src-in-org-buffer (save-buffer))))
 
-(declare-function org-babel-tangle "ob-tangle" (&optional arg target-file lang))
-
 (defun org-src-tangle (arg)
   "Tangle the parent buffer."
   (interactive)
@@ -875,19 +777,10 @@ Org-babel commands."
      (call-interactively
       (lookup-key org-babel-map key)))))
 
-(defcustom org-src-tab-acts-natively nil
-  "If non-nil, the effect of TAB in a code block is as if it were
-issued in the language major mode buffer."
-  :type 'boolean
-  :version "24.1"
-  :group 'org-babel)
-
 (defun org-src-font-lock-fontify-block (lang start end)
   "Fontify code block.
 This function is called by emacs automatic fontification, as long
-as `org-src-fontify-natively' is non-nil.  For manual
-fontification of code blocks see `org-src-fontify-block' and
-`org-src-fontify-buffer'"
+as `org-src-fontify-natively' is non-nil."
   (let ((lang-mode (org-src-get-lang-mode lang)))
     (if (fboundp lang-mode)
 	(let ((string (buffer-substring-no-properties start end))
@@ -912,20 +805,6 @@ fontification of code blocks see `org-src-fontify-block' and
 	   '(font-lock-fontified t fontified t font-lock-multiline t))
 	  (set-buffer-modified-p modified)))))
 
-(defun org-src-fontify-block ()
-  "Fontify code block at point."
-  (interactive)
-  (save-excursion
-    (let ((org-src-fontify-natively t)
-	  (info (org-edit-src-find-region-and-lang)))
-      (font-lock-fontify-region (nth 0 info) (nth 1 info)))))
-
-(defun org-src-fontify-buffer ()
-  "Fontify all code blocks in the current buffer."
-  (interactive)
-  (org-babel-map-src-blocks nil
-    (org-src-fontify-block)))
-
 (defun org-src-get-lang-mode (lang)
   "Return major mode that should be used for LANG.
 LANG is a string, and the returned major mode is a symbol."