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bug#24831: shr mangling messages

From: Katsumi Yamaoka
Subject: bug#24831: shr mangling messages
Date: Fri, 04 Nov 2016 16:19:12 +0900
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (i686-pc-cygwin)

On Wed, 02 Nov 2016 18:49:58 +0900, Katsumi Yamaoka wrote:
> On Tue, 01 Nov 2016 19:43:23 +0100, Lars Ingebrigtsen wrote:
>> And thinking about it a bit more, I think that would perhaps be the most
>> likely solution for shr, too.  That is, `shr-tag-table' could, at the
>> end there, go through and find all non-blank non-td/th elements and
>> insert them at the end.

> Thanks.  I'm trying it but not succeeded yet though,...

I did it.  A patch is below.  Bad things in this version I know
at least are:

・It does not support styles -- font, color, etc.
・No way to exclude text existing outside of <html>...</html>.

Thers is no such problems in the first version I posted. ;-)

--- shr.el~     2016-11-01 02:35:57.788777000 +0000
+++ shr.el      2016-11-04 07:17:19.789855000 +0000
@@ -1897,11 +1897,48 @@
     (when (zerop shr-table-depth)
        (shr-expand-alignments start (point)))
+      ;; Insert also non-td/th strings excluding comments and styles.
+      (save-restriction
+       (narrow-to-region (point) (point))
+       (insert (mapconcat #'identity
+                          (shr-collect-extra-strings-in-table dom)
+                          "\n"))
+       (shr-fill-lines (point-min) (point-max)))
       (dolist (elem (dom-by-tag dom 'object))
        (shr-tag-object elem))
       (dolist (elem (dom-by-tag dom 'img))
        (shr-tag-img elem)))))
+(defun shr-collect-extra-strings-in-table (dom &optional flags)
+  "Return extra strings in DOM of which the root is a table clause.
+FLAGS is a cons of two flags that control whether to collect strings."
+  ;; If and only if the cdr is not set, the car will be set to t when
+  ;; a <td> or a <th> clause is found in the children of DOM, and reset
+  ;; to nil when a <table> clause is found in the children of DOM.
+  ;; The cdr will be set to t when a <table> clause is found if the car
+  ;; is not set then, and will never be reset.
+  ;; This function collects strings if the car of FLAGS is not set.
+  (unless flags (setq flags (cons nil nil)))
+  (cl-loop for child in (dom-children dom)
+          if (stringp child)
+            when (and (not (car flags))
+                      (string-match "\\(?:[^\t\n\r ]+[\t\n\r ]+\\)*[^\t\n\r ]+"
+                                    child))
+              collect (match-string 0 child)
+            end
+          else
+            unless (let ((tag (dom-tag child)))
+                     (or (memq tag '(comment style))
+                         (progn
+                           (cond ((memq tag '(td th))
+                                  (unless (cdr flags) (setcar flags t)))
+                                 ((eq tag 'table)
+                                  (if (car flags)
+                                      (unless (cdr flags) (setcar flags nil))
+                                    (setcdr flags t))))
+                           nil)))
+              append (shr-collect-extra-strings-in-table child flags)))
 (defun shr-insert-table (table widths)
   (let* ((collapse (equal (cdr (assq 'border-collapse shr-stylesheet))

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