org-element: Store value of example-blocks and src-blocks unescaped

* lisp/org-element.el (org-element-example-block-parser,
  org-element-src-block-parser): Store value of example-blocks and
  src-blocks unescaped.
(org-element-example-block-interpreter,
org-element-src-block-interpreter): Escape value again when storing
it.
* contrib/lisp/org-export.el (org-export-unravel-code): Don't clean
  commas from code since org-element already took care of it.
* testing/lisp/test-org-export.el: Update test.
* testing/lisp/test-org-element.el: Add tests.

contrib/lisp/org-export.el

@@ -3516,22 +3516,17 @@ relative line number (integer) and name of code reference on that
 line (string)."
   (let* ((line 0) refs
 	 ;; Get code and clean it.  Remove blank lines at its
-	 ;; beginning and end.  Also remove protective commas.
+	 ;; beginning and end.
 	 (code (let ((c (replace-regexp-in-string
 			 "\\`\\([ \t]*\n\\)+" ""
 			 (replace-regexp-in-string
 			  "\\(:?[ \t]*\n\\)*[ \t]*\\'" "\n"
 			  (org-element-property :value element)))))
 		 ;; If appropriate, remove global indentation.
-		 (unless (or org-src-preserve-indentation
-			     (org-element-property :preserve-indent element))
-		   (setq c (org-remove-indentation c)))
-		 ;; Free up the protected lines.  Note: Org blocks
-		 ;; have commas at the beginning or every line.
-		 (if (string= (org-element-property :language element) "org")
-		     (replace-regexp-in-string "^," "" c)
-		   (replace-regexp-in-string
-		    "^\\(,\\)\\(:?\\*\\|[ \t]*#\\+\\)" "" c nil nil 1))))
+		 (if (or org-src-preserve-indentation
+			 (org-element-property :preserve-indent element))
+		     c
+		   (org-remove-indentation c))))
 	 ;; Get format used for references.
 	 (label-fmt (regexp-quote
 		     (or (org-element-property :label-fmt element)

lisp/org-element.el

@@ -1504,7 +1504,9 @@ containing `:begin', `:end', `:number-lines', `:preserve-indent',
 		 (begin (car keywords))
 		 (contents-begin (progn (forward-line) (point)))
 		 (hidden (org-invisible-p2))
-		 (value (buffer-substring-no-properties contents-begin contents-end))
+		 (value (org-unescape-code-in-string
+			 (buffer-substring-no-properties
+			  contents-begin contents-end)))
 		 (pos-before-blank (progn (goto-char contents-end)
 					  (forward-line)
 					  (point)))
@@ -1531,7 +1533,8 @@ 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))
+	     (org-escape-code-in-string
+	      (org-element-property :value example-block)))
 	    "#+END_EXAMPLE")))
 
 
@@ -2032,7 +2035,8 @@ Assume point is at the beginning of the block."
 		 ;; Get visibility status.
 		 (hidden (progn (forward-line) (org-invisible-p2)))
 		 ;; Retrieve code.
-		 (value (buffer-substring-no-properties (point) contents-end))
+		 (value (org-unescape-code-in-string
+			 (buffer-substring-no-properties (point) contents-end)))
 		 (pos-before-blank (progn (goto-char contents-end)
 					  (forward-line)
 					  (point)))
@@ -2080,7 +2084,7 @@ CONTENTS is nil."
 		    (concat (and lang (concat " " lang))
 			    (and switches (concat " " switches))
 			    (and params (concat " " params))))
-	    value
+	    (org-escape-code-in-string value)
 	    "#+END_SRC")))
 
 

testing/lisp/test-org-element.el

@@ -465,7 +465,13 @@ CLOCK: [2012-01-01 sun. 00:01]--[2012-01-01 sun. 00:02] =>  0:01"
   (should-not
    (org-test-with-temp-text "#+BEGIN_EXAMPLE"
      (org-element-map
-      (org-element-parse-buffer) 'example-block 'identity nil t))))
+      (org-element-parse-buffer) 'example-block 'identity nil t)))
+  ;; Properly un-escape code.
+  (should
+   (equal "* Headline\n #+keyword\nText\n"
+	  (org-test-with-temp-text
+	      "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText\n#+END_EXAMPLE"
+	    (org-element-property :value (org-element-at-point))))))
 
 (ert-deftest test-org-element/block-switches ()
   "Test `example-block' and `src-block' switches parsing."
@@ -1450,7 +1456,13 @@ Outside list"
   ;; Ignore incomplete block.
   (should-not
    (org-test-with-temp-text "#+BEGIN_SRC"
-     (org-element-map (org-element-parse-buffer) 'src-block 'identity))))
+     (org-element-map (org-element-parse-buffer) 'src-block 'identity)))
+  ;; Properly un-escape code.
+  (should
+   (equal "* Headline\n #+keyword\nText\n"
+	  (org-test-with-temp-text
+	      "#+BEGIN_SRC org\n,* Headline\n ,#+keyword\nText\n#+END_SRC"
+	    (org-element-property :value (org-element-at-point))))))
 
 
 ;;;; Statistics Cookie
@@ -1911,7 +1923,12 @@ CLOCK: [2012-01-01 sun. 00:01]--[2012-01-01 sun. 00:02] =>  0:01"))
   (should
    (equal (org-test-parse-and-interpret
 	   "#+BEGIN_EXAMPLE -n -k\n(+ 1 1)\n#+END_EXAMPLE")
-	  "#+BEGIN_EXAMPLE -n -k\n(+ 1 1)\n#+END_EXAMPLE\n")))
+	  "#+BEGIN_EXAMPLE -n -k\n(+ 1 1)\n#+END_EXAMPLE\n"))
+  ;; Preserve code escaping.
+  (should
+   (equal (org-test-parse-and-interpret
+	   "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText #+END_EXAMPLE")
+	  "#+BEGIN_EXAMPLE\n,* Headline\n ,#+keyword\nText #+END_EXAMPLE\n")))
 
 (ert-deftest test-org-element/export-block-interpreter ()
   "Test export block interpreter."
@@ -1975,7 +1992,12 @@ CLOSED: [2012-01-01] DEADLINE: <2012-01-01> SCHEDULED: <2012-01-01>\n"))))
    (equal (let ((org-edit-src-content-indentation 2))
 	    (org-test-parse-and-interpret
 	     "#+BEGIN_SRC emacs-lisp -n -k\n(+ 1 1)\n#+END_SRC"))
-	  "#+BEGIN_SRC emacs-lisp -n -k\n  (+ 1 1)\n#+END_SRC\n")))
+	  "#+BEGIN_SRC emacs-lisp -n -k\n  (+ 1 1)\n#+END_SRC\n"))
+  ;; Preserve code escaping.
+  (should
+   (equal (org-test-parse-and-interpret
+	   "#+BEGIN_SRC org\n,* Headline\n ,#+keyword\nText #+END_SRC")
+	  "#+BEGIN_SRC org\n,* Headline\n ,#+keyword\nText #+END_SRC\n")))
 
 (ert-deftest test-org-element/table-interpreter ()
   "Test table, table-row and table-cell interpreters."

testing/lisp/test-org-export.el

@@ -1068,20 +1068,7 @@ Another text. (ref:text)
 #+END_EXAMPLE"
       (goto-line 5)
       (should (equal (org-export-unravel-code (org-element-at-point))
-		     '("(+ 2 2)\n(+ 3 3)\n" (2 . "one")))))
-    ;; 5. Free up comma-protected lines.
-    ;;
-    ;; 5.1. In an Org source block, every line is protected.
-    (org-test-with-temp-text
-	"#+BEGIN_SRC org\n,* Test\n,# comment\n,Text\n#+END_SRC"
-      (should (equal (org-export-unravel-code (org-element-at-point))
-		     '("* Test\n# comment\nText\n"))))
-    ;; 5.2. In other blocks, only headlines, comments and keywords are
-    ;;      protected.
-    (org-test-with-temp-text
-	"#+BEGIN_EXAMPLE\n,* Headline\n, * Not headline\n,Keep\n#+END_EXAMPLE"
-      (should (equal (org-export-unravel-code (org-element-at-point))
-		     '("* Headline\n, * Not headline\n,Keep\n"))))))
+		     '("(+ 2 2)\n(+ 3 3)\n" (2 . "one")))))))