shr.el 27.8 KB
Newer Older
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
;;; shr.el --- Simple HTML Renderer

;; Copyright (C) 2010 Free Software Foundation, Inc.

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; Keywords: html

;; This file is part of GNU Emacs.

;; GNU Emacs 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.

;; GNU Emacs 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.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This package takes a HTML parse tree (as provided by
;; libxml-parse-html-region) and renders it in the current buffer.  It
;; does not do CSS, JavaScript or anything advanced: It's geared
;; towards rendering typical short snippets of HTML, like what you'd
;; find in HTML email and the like.

;;; Code:

33
(eval-when-compile (require 'cl))
34
(require 'browse-url)
Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
35 36
(unless (aref (char-category-set (make-char 'japanese-jisx0208 33 35)) ?>)
  (load "kinsoku" nil t))
37

38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57
(defgroup shr nil
  "Simple HTML Renderer"
  :group 'mail)

(defcustom shr-max-image-proportion 0.9
  "How big pictures displayed are in relation to the window they're in.
A value of 0.7 means that they are allowed to take up 70% of the
width and height of the window.  If they are larger than this,
and Emacs supports it, then the images will be rescaled down to
fit these criteria."
  :version "24.1"
  :group 'shr
  :type 'float)

(defcustom shr-blocked-images nil
  "Images that have URLs matching this regexp will be blocked."
  :version "24.1"
  :group 'shr
  :type 'regexp)

58 59 60
(defcustom shr-table-line ?-
  "Character used to draw table line."
  :group 'shr
61
  :type 'character)
62 63

(defcustom shr-table-corner ?+
64 65
  "Character used to draw table corner."
  :group 'shr
66
  :type 'character)
67 68 69

(defcustom shr-hr-line ?-
  "Character used to draw hr line."
70
  :group 'shr
71
  :type 'character)
72

73 74 75 76 77
(defcustom shr-width fill-column
  "Frame width to use for rendering."
  :type 'integer
  :group 'shr)

78 79 80 81 82
(defvar shr-content-function nil
  "If bound, this should be a function that will return the content.
This is used for cid: URLs, and the function is called with the
cid: URL as the argument.")

83 84
;;; Internal variables.

85 86 87
(defvar shr-folding-mode nil)
(defvar shr-state nil)
(defvar shr-start nil)
88
(defvar shr-indentation 0)
89
(defvar shr-inhibit-images nil)
90
(defvar shr-list-mode nil)
91
(defvar shr-content-cache nil)
92
(defvar shr-kinsoku-shorten nil)
93
(defvar shr-table-depth 0)
94

95 96 97 98 99 100 101
(defvar shr-map
  (let ((map (make-sparse-keymap)))
    (define-key map "a" 'shr-show-alt-text)
    (define-key map "i" 'shr-browse-image)
    (define-key map "I" 'shr-insert-image)
    (define-key map "u" 'shr-copy-url)
    (define-key map "v" 'shr-browse-url)
102
    (define-key map "o" 'shr-save-contents)
103 104 105
    (define-key map "\r" 'shr-browse-url)
    map))

106 107 108 109
;; Public functions and commands.

;;;###autoload
(defun shr-insert-document (dom)
110
  (setq shr-content-cache nil)
111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162
  (let ((shr-state nil)
	(shr-start nil))
    (shr-descend (shr-transform-dom dom))))

(defun shr-copy-url ()
  "Copy the URL under point to the kill ring.
If called twice, then try to fetch the URL and see whether it
redirects somewhere else."
  (interactive)
  (let ((url (get-text-property (point) 'shr-url)))
    (cond
     ((not url)
      (message "No URL under point"))
     ;; Resolve redirected URLs.
     ((equal url (car kill-ring))
      (url-retrieve
       url
       (lambda (a)
	 (when (and (consp a)
		    (eq (car a) :redirect))
	   (with-temp-buffer
	     (insert (cadr a))
	     (goto-char (point-min))
	     ;; Remove common tracking junk from the URL.
	     (when (re-search-forward ".utm_.*" nil t)
	       (replace-match "" t t))
	     (message "Copied %s" (buffer-string))
	     (copy-region-as-kill (point-min) (point-max)))))))
     ;; Copy the URL to the kill ring.
     (t
      (with-temp-buffer
	(insert url)
	(copy-region-as-kill (point-min) (point-max))
	(message "Copied %s" url))))))

(defun shr-show-alt-text ()
  "Show the ALT text of the image under point."
  (interactive)
  (let ((text (get-text-property (point) 'shr-alt)))
    (if (not text)
	(message "No image under point")
      (message "%s" text))))

(defun shr-browse-image ()
  "Browse the image under point."
  (interactive)
  (let ((url (get-text-property (point) 'shr-image)))
    (if (not url)
	(message "No image under point")
      (message "Browsing %s..." url)
      (browse-url url))))

163 164 165 166 167 168 169 170 171 172 173
(defun shr-insert-image ()
  "Insert the image under point into the buffer."
  (interactive)
  (let ((url (get-text-property (point) 'shr-image)))
    (if (not url)
	(message "No image under point")
      (message "Inserting %s..." url)
      (url-retrieve url 'shr-image-fetched
		    (list (current-buffer) (1- (point)) (point-marker))
		    t))))

174 175
;;; Utility functions.

176 177 178 179 180 181 182 183
(defun shr-transform-dom (dom)
  (let ((result (list (pop dom))))
    (dolist (arg (pop dom))
      (push (cons (intern (concat ":" (symbol-name (car arg))) obarray)
		  (cdr arg))
	    result))
    (dolist (sub dom)
      (if (stringp sub)
184
	  (push (cons 'text sub) result)
185 186 187 188
	(push (shr-transform-dom sub) result)))
    (nreverse result)))

(defun shr-descend (dom)
189
  (let ((function (intern (concat "shr-tag-" (symbol-name (car dom))) obarray)))
190 191 192 193 194 195 196
    (if (fboundp function)
	(funcall function (cdr dom))
      (shr-generic (cdr dom)))))

(defun shr-generic (cont)
  (dolist (sub cont)
    (cond
197
     ((eq (car sub) 'text)
198
      (shr-insert (cdr sub)))
199
     ((listp (cdr sub))
200 201
      (shr-descend sub)))))

202
(defun shr-insert (text)
203 204
  (when (and (eq shr-state 'image)
	     (not (string-match "\\`[ \t\n]+\\'" text)))
205 206 207 208 209 210
    (insert "\n")
    (setq shr-state nil))
  (cond
   ((eq shr-folding-mode 'none)
    (insert text))
   (t
211 212 213 214 215 216 217 218 219 220 221 222 223 224
    (when (and (string-match "\\`[ \t\n]" text)
	       (not (bolp))
	       (not (eq (char-after (1- (point))) ? )))
      (insert " "))
    (dolist (elem (split-string text))
      (when (and (bolp)
		 (> shr-indentation 0))
	(shr-indent))
      ;; The shr-start is a special variable that is used to pass
      ;; upwards the first point in the buffer where the text really
      ;; starts.
      (unless shr-start
	(setq shr-start (point)))
      ;; No space is needed behind a wide character categorized as
225 226
      ;; kinsoku-bol, between characters both categorized as nospace,
      ;; or at the beginning of a line.
227
      (let (prev)
228 229
	(when (and (eq (preceding-char) ? )
		   (or (= (line-beginning-position) (1- (point)))
230 231 232 233 234 235 236 237
		       (and (aref fill-find-break-point-function-table
				  (setq prev (char-after (- (point) 2))))
			    (aref (char-category-set prev) ?>))
		       (and (aref fill-nospace-between-words-table prev)
			    (aref fill-nospace-between-words-table
				  (aref elem 0)))))
	  (delete-char -1)))
      (insert elem)
238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255
      (let (found)
	(while (and (> (current-column) shr-width)
		    (progn
		      (setq found (shr-find-fill-point))
		      (not (eolp))))
	  (unless (prog1
		      found
		    (when (eq (preceding-char) ? )
		      (delete-char -1))
		    (insert "\n"))
	    (put-text-property (1- (point)) (point) 'shr-break t)
	    ;; No space is needed at the beginning of a line.
	    (when (eq (following-char) ? )
	      (delete-char 1)))
	  (when (> shr-indentation 0)
	    (shr-indent))
	  (end-of-line))
	(insert " ")))
256 257
    (unless (string-match "[ \t\n]\\'" text)
      (delete-char -1)))))
258

259
(defun shr-find-fill-point ()
260 261 262 263 264 265 266 267 268 269
  (when (> (move-to-column shr-width) shr-width)
    (backward-char 1))
  (let (failed)
    (while (not
	    (or (setq failed (= (current-column) shr-indentation))
		(eq (preceding-char) ? )
		(eq (following-char) ? )
		(aref fill-find-break-point-function-table (preceding-char))))
      (backward-char 1))
    (if failed
270
	;; There's no breakable point, so we give it up.
271 272 273 274 275 276 277 278 279
	(progn
	  (end-of-line)
	  (while (aref fill-find-break-point-function-table (preceding-char))
	    (backward-char 1))
	  nil)
      (or (eolp)
	  ;; Don't put kinsoku-bol characters at the beginning of a line,
	  ;; or kinsoku-eol characters at the end of a line,
	  (let ((count 4))
280 281 282 283 284 285
	    (if (or shr-kinsoku-shorten
		    (and (aref (char-category-set (preceding-char)) ?<)
			 (progn
			   (setq count (1- count))
			   (backward-char 1)
			   t)))
286
		(while (and
287 288
			(>= (setq count (1- count)) 0)
			(not (memq (preceding-char) (list ?\C-@ ?\n ? )))
289 290 291
			(or (aref (char-category-set (preceding-char)) ?<)
			    (aref (char-category-set (following-char)) ?>)))
		  (backward-char 1))
292
	      (while (and (>= (setq count (1- count)) 0)
293 294 295
			  (aref (char-category-set (following-char)) ?>)
			  (aref fill-find-break-point-function-table
				(following-char)))
296
		(forward-char 1)))
297 298
	    (when (eq (following-char) ? )
	      (forward-char 1))
299
	    t)))))
300

301 302 303
(defun shr-ensure-newline ()
  (unless (zerop (current-column))
    (insert "\n")))
304 305 306

(defun shr-ensure-paragraph ()
  (unless (bobp)
307
    (if (<= (current-column) shr-indentation)
308 309 310
	(unless (save-excursion
		  (forward-line -1)
		  (looking-at " *$"))
311 312 313
	  (insert "\n"))
      (if (save-excursion
	    (beginning-of-line)
314
	    (looking-at " *$"))
315 316 317
	  (insert "\n")
	(insert "\n\n")))))

318
(defun shr-indent ()
319 320
  (when (> shr-indentation 0)
    (insert (make-string shr-indentation ? ))))
321

322
(defun shr-fontize-cont (cont &rest types)
323 324
  (let (shr-start)
    (shr-generic cont)
325 326
    (dolist (type types)
      (shr-add-font (or shr-start (point)) (point) type))))
327

328 329 330
;; Add an overlay in the region, but avoid putting the font properties
;; on blank text at the start of the line, and the newline at the end,
;; to avoid ugliness.
331
(defun shr-add-font (start end type)
332 333 334 335 336 337 338 339 340 341
  (save-excursion
    (goto-char start)
    (while (< (point) end)
      (when (bolp)
	(skip-chars-forward " "))
      (let ((overlay (make-overlay (point) (min (line-end-position) end))))
	(overlay-put overlay 'face type))
      (if (< (line-end-position) end)
	  (forward-line 1)
	(goto-char end)))))
342

343 344 345 346
(defun shr-browse-url ()
  "Browse the URL under point."
  (interactive)
  (let ((url (get-text-property (point) 'shr-url)))
347 348 349 350
    (cond
     ((not url)
      (message "No link under point"))
     ((string-match "^mailto:" url)
351
      (browse-url-mailto url))
352 353
     (t
      (browse-url url)))))
354

355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371
(defun shr-save-contents (directory)
  "Save the contents from URL in a file."
  (interactive "DSave contents of URL to directory: ")
  (let ((url (get-text-property (point) 'shr-url)))
    (if (not url)
	(message "No link under point")
      (url-retrieve (shr-encode-url url)
		    'shr-store-contents (list url directory)))))

(defun shr-store-contents (status url directory)
  (unless (plist-get status :error)
    (when (or (search-forward "\n\n" nil t)
	      (search-forward "\r\n\r\n" nil t))
      (write-region (point) (point-max)
		    (expand-file-name (file-name-nondirectory url)
				      directory)))))

372 373 374 375 376 377 378 379 380 381 382
(defun shr-image-fetched (status buffer start end)
  (when (and (buffer-name buffer)
	     (not (plist-get status :error)))
    (url-store-in-cache (current-buffer))
    (when (or (search-forward "\n\n" nil t)
	      (search-forward "\r\n\r\n" nil t))
      (let ((data (buffer-substring (point) (point-max))))
        (with-current-buffer buffer
          (let ((alt (buffer-substring start end))
		(inhibit-read-only t))
	    (delete-region start end)
383 384
	    (goto-char start)
	    (shr-put-image data alt))))))
385 386
  (kill-buffer (current-buffer)))

387
(defun shr-put-image (data alt)
388 389 390 391
  (if (display-graphic-p)
      (let ((image (ignore-errors
                     (shr-rescale-image data))))
        (when image
392 393
	  (insert-image image (or alt "*"))))
    (insert alt)))
394 395 396 397 398 399

(defun shr-rescale-image (data)
  (if (or (not (fboundp 'imagemagick-types))
	  (not (get-buffer-window (current-buffer))))
      (create-image data nil t)
    (let* ((image (create-image data nil t))
400
	   (size (image-size image t))
401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421
	   (width (car size))
	   (height (cdr size))
	   (edges (window-inside-pixel-edges
		   (get-buffer-window (current-buffer))))
	   (window-width (truncate (* shr-max-image-proportion
				      (- (nth 2 edges) (nth 0 edges)))))
	   (window-height (truncate (* shr-max-image-proportion
				       (- (nth 3 edges) (nth 1 edges)))))
	   scaled-image)
      (when (> height window-height)
	(setq image (or (create-image data 'imagemagick t
				      :height window-height)
			image))
	(setq size (image-size image t)))
      (when (> (car size) window-width)
	(setq image (or
		     (create-image data 'imagemagick t
				   :width window-width)
		     image)))
      image)))

Glenn Morris's avatar
Glenn Morris committed
422 423 424
;; url-cache-extract autoloads url-cache.
(declare-function url-cache-create-filename "url-cache" (url))
(autoload 'mm-disable-multibyte "mm-util")
425
(autoload 'browse-url-mailto "browse-url")
Glenn Morris's avatar
Glenn Morris committed
426

427 428 429 430 431
(defun shr-get-image-data (url)
  "Get image data for URL.
Return a string with image data."
  (with-temp-buffer
    (mm-disable-multibyte)
432
    (when (ignore-errors
433
	    (url-cache-extract (url-cache-create-filename (shr-encode-url url)))
434 435 436 437
	    t)
      (when (or (search-forward "\n\n" nil t)
		(search-forward "\r\n\r\n" nil t))
	(buffer-substring (point) (point-max))))))
438

439 440 441 442 443
(defun shr-heading (cont &rest types)
  (shr-ensure-paragraph)
  (apply #'shr-fontize-cont cont types)
  (shr-ensure-paragraph))

Glenn Morris's avatar
Glenn Morris committed
444 445
(autoload 'widget-convert-button "wid-edit")

446 447 448 449 450 451 452 453 454 455 456 457
(defun shr-urlify (start url)
  (widget-convert-button
   'url-link start (point)
   :help-echo url
   :keymap shr-map
   url)
  (put-text-property start (point) 'shr-url url))

(defun shr-encode-url (url)
  "Encode URL."
  (browse-url-url-encode-chars url "[)$ ]"))

458 459 460 461
;;; Tag-specific rendering rules.

(defun shr-tag-p (cont)
  (shr-ensure-paragraph)
462
  (shr-indent)
463 464 465
  (shr-generic cont)
  (shr-ensure-paragraph))

Katsumi Yamaoka's avatar
Katsumi Yamaoka committed
466 467 468 469 470 471
(defun shr-tag-div (cont)
  (shr-ensure-newline)
  (shr-indent)
  (shr-generic cont)
  (shr-ensure-newline))

472 473 474 475 476 477 478 479 480
(defun shr-tag-b (cont)
  (shr-fontize-cont cont 'bold))

(defun shr-tag-i (cont)
  (shr-fontize-cont cont 'italic))

(defun shr-tag-em (cont)
  (shr-fontize-cont cont 'bold))

481 482 483
(defun shr-tag-strong (cont)
  (shr-fontize-cont cont 'bold))

484 485 486 487 488 489
(defun shr-tag-u (cont)
  (shr-fontize-cont cont 'underline))

(defun shr-tag-s (cont)
  (shr-fontize-cont cont 'strike-through))

490 491 492 493 494 495 496 497 498 499 500 501 502 503 504
(defun shr-parse-style (style)
  (when style
    (let ((plist nil))
      (dolist (elem (split-string style ";"))
	(when elem
	  (setq elem (split-string elem ":"))
	  (when (and (car elem)
		     (cadr elem))
	    (let ((name (replace-regexp-in-string "^ +\\| +$" "" (car elem)))
		  (value (replace-regexp-in-string "^ +\\| +$" "" (cadr elem))))
	      (push (cons (intern name obarray)
			  value)
		    plist)))))
      plist)))

505 506 507 508 509
(defun shr-tag-a (cont)
  (let ((url (cdr (assq :href cont)))
	(start (point))
	shr-start)
    (shr-generic cont)
510 511 512
    (shr-urlify (or shr-start start) url)))

(defun shr-tag-object (cont)
513 514 515 516 517 518 519 520
  (let ((start (point))
	url)
    (dolist (elem cont)
      (when (eq (car elem) 'embed)
	(setq url (or url (cdr (assq :src (cdr elem))))))
      (when (and (eq (car elem) 'param)
		 (equal (cdr (assq :name (cdr elem))) "movie"))
	(setq url (or url (cdr (assq :value (cdr elem)))))))
521 522
    (when url
      (shr-insert " [multimedia] ")
523 524 525 526 527 528 529 530 531
      (shr-urlify start url))
    (shr-generic cont)))

(defun shr-tag-video (cont)
  (let ((image (cdr (assq :poster cont)))
	(url (cdr (assq :src cont)))
	(start (point)))
    (shr-tag-img nil image)
    (shr-urlify start url)))
532

533 534 535 536
(defun shr-tag-img (cont &optional url)
  (when (or url
	    (and cont
		 (cdr (assq :src cont))))
537 538 539 540
    (when (and (> (current-column) 0)
	       (not (eq shr-state 'image)))
      (insert "\n"))
    (let ((alt (cdr (assq :alt cont)))
541
	  (url (or url (cdr (assq :src cont)))))
542 543
      (let ((start (point-marker)))
	(when (zerop (length alt))
544
	  (setq alt "*"))
545
	(cond
546 547 548 549
	 ((or (member (cdr (assq :height cont)) '("0" "1"))
	      (member (cdr (assq :width cont)) '("0" "1")))
	  ;; Ignore zero-sized or single-pixel images.
	  )
550 551 552 553 554 555 556
	 ((and (not shr-inhibit-images)
	       (string-match "\\`cid:" url))
	  (let ((url (substring url (match-end 0)))
		image)
	    (if (or (not shr-content-function)
		    (not (setq image (funcall shr-content-function url))))
		(insert alt)
557
	      (shr-put-image image alt))))
558 559 560 561 562
	 ((or shr-inhibit-images
	      (and shr-blocked-images
		   (string-match shr-blocked-images url)))
	  (setq shr-start (point))
	  (let ((shr-state 'space))
563 564
	    (if (> (string-width alt) 8)
		(shr-insert (truncate-string-to-width alt 8))
565 566
	      (shr-insert alt))))
	 ((url-is-cached (shr-encode-url url))
567
	  (shr-put-image (shr-get-image-data url) alt))
568 569 570 571 572 573 574 575 576
	 (t
	  (insert alt)
	  (ignore-errors
	    (url-retrieve (shr-encode-url url) 'shr-image-fetched
			  (list (current-buffer) start (point-marker))
			  t))))
	(put-text-property start (point) 'keymap shr-map)
	(put-text-property start (point) 'shr-alt alt)
	(put-text-property start (point) 'shr-image url)
577
	(put-text-property start (point) 'help-echo alt)
578
	(setq shr-state 'image)))))
579 580 581 582

(defun shr-tag-pre (cont)
  (let ((shr-folding-mode 'none))
    (shr-ensure-newline)
583
    (shr-indent)
584 585 586 587 588
    (shr-generic cont)
    (shr-ensure-newline)))

(defun shr-tag-blockquote (cont)
  (shr-ensure-paragraph)
589
  (shr-indent)
590 591 592
  (let ((shr-indentation (+ shr-indentation 4)))
    (shr-generic cont))
  (shr-ensure-paragraph))
593 594 595 596

(defun shr-tag-ul (cont)
  (shr-ensure-paragraph)
  (let ((shr-list-mode 'ul))
597 598
    (shr-generic cont))
  (shr-ensure-paragraph))
599 600

(defun shr-tag-ol (cont)
601
  (shr-ensure-paragraph)
602
  (let ((shr-list-mode 1))
603 604
    (shr-generic cont))
  (shr-ensure-paragraph))
605 606

(defun shr-tag-li (cont)
607 608
  (shr-ensure-paragraph)
  (shr-indent)
609 610 611 612 613 614 615 616 617
  (let* ((bullet
	  (if (numberp shr-list-mode)
	      (prog1
		  (format "%d " shr-list-mode)
		(setq shr-list-mode (1+ shr-list-mode)))
	    "* "))
	 (shr-indentation (+ shr-indentation (length bullet))))
    (insert bullet)
    (shr-generic cont)))
618 619

(defun shr-tag-br (cont)
620
  (unless (bobp)
621 622
    (insert "\n")
    (shr-indent))
623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642
  (shr-generic cont))

(defun shr-tag-h1 (cont)
  (shr-heading cont 'bold 'underline))

(defun shr-tag-h2 (cont)
  (shr-heading cont 'bold))

(defun shr-tag-h3 (cont)
  (shr-heading cont 'italic))

(defun shr-tag-h4 (cont)
  (shr-heading cont))

(defun shr-tag-h5 (cont)
  (shr-heading cont))

(defun shr-tag-h6 (cont)
  (shr-heading cont))

643 644
(defun shr-tag-hr (cont)
  (shr-ensure-newline)
645
  (insert (make-string shr-width shr-hr-line) "\n"))
646

647
;;; Table rendering algorithm.
648

649 650 651 652 653 654 655 656
;; Table rendering is the only complicated thing here.  We do this by
;; first counting how many TDs there are in each TR, and registering
;; how wide they think they should be ("width=45%", etc).  Then we
;; render each TD separately (this is done in temporary buffers, so
;; that we can use all the rendering machinery as if we were in the
;; main buffer).  Now we know how much space each TD really takes, so
;; we then render everything again with the new widths, and finally
;; insert all these boxes into the main buffer.
657
(defun shr-tag-table-1 (cont)
658 659
  (setq cont (or (cdr (assq 'tbody cont))
		 cont))
660
  (let* ((shr-inhibit-images t)
661
	 (shr-table-depth (1+ shr-table-depth))
662
	 (shr-kinsoku-shorten t)
663
	 ;; Find all suggested widths.
664
	 (columns (shr-column-specs cont))
665
	 ;; Compute how many characters wide each TD should be.
666
	 (suggested-widths (shr-pro-rate-columns columns))
667 668 669
	 ;; Do a "test rendering" to see how big each TD is (this can
	 ;; be smaller (if there's little text) or bigger (if there's
	 ;; unbreakable text).
670
	 (sketch (shr-make-table cont suggested-widths))
671
	 (sketch-widths (shr-table-widths sketch suggested-widths)))
672
    ;; This probably won't work very well.
673 674 675
    (when (> (+ (loop for width across sketch-widths
		      summing (1+ width))
		shr-indentation 1)
676 677
	     (frame-width))
      (setq truncate-lines t))
678
    ;; Then render the table again with these new "hard" widths.
679
    (shr-insert-table (shr-make-table cont sketch-widths t) sketch-widths))
680 681 682
  ;; Finally, insert all the images after the table.  The Emacs buffer
  ;; model isn't strong enough to allow us to put the images actually
  ;; into the tables.
683 684 685
  (when (zerop shr-table-depth)
    (dolist (elem (shr-find-elements cont 'img))
      (shr-tag-img (cdr elem)))))
686

687 688 689 690 691 692 693 694 695 696
(defun shr-tag-table (cont)
  (shr-ensure-paragraph)
  (let* ((caption (cdr (assq 'caption cont)))
	 (header (cdr (assq 'thead cont)))
	 (body (or (cdr (assq 'tbody cont)) cont))
	 (footer (cdr (assq 'tfoot cont)))
	 (nheader (if header (shr-max-columns header)))
	 (nbody (if body (shr-max-columns body)))
	 (nfooter (if footer (shr-max-columns footer))))
    (shr-tag-table-1
697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727
     (nconc
      (if caption `((tr (td ,@caption))))
      (if header
	  (if footer
	      ;; hader + body + footer
	      (if (= nheader nbody)
		  (if (= nbody nfooter)
		      `((tr (td (table (tbody ,@header ,@body ,@footer)))))
		    (nconc `((tr (td (table (tbody ,@header ,@body)))))
			   (if (= nfooter 1)
			       footer
			     `((tr (td (table (tbody ,@footer))))))))
		(nconc `((tr (td (table (tbody ,@header)))))
		       (if (= nbody nfooter)
			   `((tr (td (table (tbody ,@body ,@footer)))))
			 (nconc `((tr (td (table (tbody ,@body)))))
				(if (= nfooter 1)
				    footer
				  `((tr (td (table (tbody ,@footer))))))))))
	    ;; header + body
	    (if (= nheader nbody)
		`((tr (td (table (tbody ,@header ,@body)))))
	      (if (= nheader 1)
		  `(,@header (tr (td (table (tbody ,@body)))))
		`((tr (td (table (tbody ,@header))))
		  (tr (td (table (tbody ,@body))))))))
	(if footer
	    ;; body + footer
	    (if (= nbody nfooter)
		`((tr (td (table (tbody ,@body ,@footer)))))
	      (nconc `((tr (td (table (tbody ,@body)))))
728
		     (if (= nfooter 1)
729 730 731 732 733
			 footer
		       `((tr (td (table (tbody ,@footer))))))))
	  (if caption
	      `((tr (td (table (tbody ,@body)))))
	    body)))))))
734

735 736 737 738 739 740 741 742
(defun shr-find-elements (cont type)
  (let (result)
    (dolist (elem cont)
      (cond ((eq (car elem) type)
	     (push elem result))
	    ((consp (cdr elem))
	     (setq result (nconc (shr-find-elements (cdr elem) type) result)))))
    (nreverse result)))
743 744 745 746 747 748 749 750 751 752 753 754 755 756

(defun shr-insert-table (table widths)
  (shr-insert-table-ruler widths)
  (dolist (row table)
    (let ((start (point))
	  (height (let ((max 0))
		    (dolist (column row)
		      (setq max (max max (cadr column))))
		    max)))
      (dotimes (i height)
	(shr-indent)
	(insert "|\n"))
      (dolist (column row)
	(goto-char start)
757
	(let ((lines (nth 2 column))
758 759
	      (overlay-lines (nth 3 column))
	      overlay overlay-line)
760
	  (dolist (line lines)
761
	    (setq overlay-line (pop overlay-lines))
762 763 764 765 766 767 768 769 770
	    (end-of-line)
	    (insert line "|")
	    (dolist (overlay overlay-line)
	      (let ((o (make-overlay (- (point) (nth 0 overlay) 1)
				     (- (point) (nth 1 overlay) 1)))
		    (properties (nth 2 overlay)))
		(while properties
		  (overlay-put o (pop properties) (pop properties)))))
	    (forward-line 1))
771 772 773 774
	  ;; Add blank lines at padding at the bottom of the TD,
	  ;; possibly.
	  (dotimes (i (- height (length lines)))
	    (end-of-line)
775
	    (insert (make-string (string-width (car lines)) ? ) "|")
776 777 778 779
	    (forward-line 1)))))
    (shr-insert-table-ruler widths)))

(defun shr-insert-table-ruler (widths)
780 781 782
  (when (and (bolp)
	     (> shr-indentation 0))
    (shr-indent))
783
  (insert shr-table-corner)
784
  (dotimes (i (length widths))
785
    (insert (make-string (aref widths i) shr-table-line) shr-table-corner))
786 787
  (insert "\n"))

788 789 790 791
(defun shr-table-widths (table suggested-widths)
  (let* ((length (length suggested-widths))
	 (widths (make-vector length 0))
	 (natural-widths (make-vector length 0)))
792 793 794 795 796
    (dolist (row table)
      (let ((i 0))
	(dolist (column row)
	  (aset widths i (max (aref widths i)
			      (car column)))
797 798 799
	  (aset natural-widths i (max (aref natural-widths i)
				      (cadr column)))
	  (setq i (1+ i)))))
800 801
    (let ((extra (- (apply '+ (append suggested-widths nil))
		    (apply '+ (append widths nil))))
802 803 804 805 806 807 808 809 810 811 812 813 814
	  (expanded-columns 0))
      (when (> extra 0)
	(dotimes (i length)
	  ;; If the natural width is wider than the rendered width, we
	  ;; want to allow the column to expand.
	  (when (> (aref natural-widths i) (aref widths i))
	    (setq expanded-columns (1+ expanded-columns))))
	(dotimes (i length)
	  (when (> (aref natural-widths i) (aref widths i))
	    (aset widths i (min
			    (1+ (aref natural-widths i))
			    (+ (/ extra expanded-columns)
			       (aref widths i))))))))
815 816 817 818 819 820
    widths))

(defun shr-make-table (cont widths &optional fill)
  (let ((trs nil))
    (dolist (row cont)
      (when (eq (car row) 'tr)
821 822 823 824 825 826 827 828
	(let ((tds nil)
	      (columns (cdr row))
	      (i 0)
	      column)
	  (while (< i (length widths))
	    (setq column (pop columns))
	    (when (or (memq (car column) '(td th))
		      (null column))
829 830 831 832 833 834 835 836
	      (push (shr-render-td (cdr column) (aref widths i) fill)
		    tds)
	      (setq i (1+ i))))
	  (push (nreverse tds) trs))))
    (nreverse trs)))

(defun shr-render-td (cont width fill)
  (with-temp-buffer
837 838 839 840 841 842 843 844 845 846 847 848
    (let ((cache (cdr (assoc (cons width cont) shr-content-cache))))
      (if cache
	  (insert cache)
	(let ((shr-width width)
	      (shr-indentation 0))
	  (shr-generic cont))
	(delete-region
	 (point)
	 (+ (point)
	    (skip-chars-backward " \t\n")))
	(push (cons (cons width cont) (buffer-string))
	      shr-content-cache)))
849 850 851 852 853 854 855 856
    (goto-char (point-min))
    (let ((max 0))
      (while (not (eobp))
	(end-of-line)
	(setq max (max max (current-column)))
	(forward-line 1))
      (when fill
	(goto-char (point-min))
857 858 859 860 861 862 863 864 865 866
	;; If the buffer is totally empty, then put a single blank
	;; line here.
	(if (zerop (buffer-size))
	    (insert (make-string width ? ))
	  ;; Otherwise, fill the buffer.
	  (while (not (eobp))
	    (end-of-line)
	    (when (> (- width (current-column)) 0)
	      (insert (make-string (- width (current-column)) ? )))
	    (forward-line 1))))
867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886
      (if fill
	  (list max
		(count-lines (point-min) (point-max))
		(split-string (buffer-string) "\n")
		(shr-collect-overlays))
	(list max
	      (shr-natural-width))))))

(defun shr-natural-width ()
  (goto-char (point-min))
  (let ((current 0)
	(max 0))
    (while (not (eobp))
      (end-of-line)
      (setq current (+ current (current-column)))
      (unless (get-text-property (point) 'shr-break)
	(setq max (max max current)
	      current 0))
      (forward-line 1))
    max))
887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909

(defun shr-collect-overlays ()
  (save-excursion
    (goto-char (point-min))
    (let ((overlays nil))
      (while (not (eobp))
	(push (shr-overlays-in-region (point) (line-end-position))
	      overlays)
	(forward-line 1))
      (nreverse overlays))))

(defun shr-overlays-in-region (start end)
  (let (result)
    (dolist (overlay (overlays-in start end))
      (push (list (if (> start (overlay-start overlay))
		      (- end start)
		    (- end (overlay-start overlay)))
		  (if (< end (overlay-end overlay))
		      0
		    (- end (overlay-end overlay)))
		  (overlay-properties overlay))
	    result))
    (nreverse result)))
910 911 912 913 914

(defun shr-pro-rate-columns (columns)
  (let ((total-percentage 0)
	(widths (make-vector (length columns) 0)))
    (dotimes (i (length columns))
915
      (setq total-percentage (+ total-percentage (aref columns i))))
916 917 918 919
    (setq total-percentage (/ 1.0 total-percentage))
    (dotimes (i (length columns))
      (aset widths i (max (truncate (* (aref columns i)
				       total-percentage
920
				       (- shr-width (1+ (length columns)))))
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936
			  10)))
    widths))

;; Return a summary of the number and shape of the TDs in the table.
(defun shr-column-specs (cont)
  (let ((columns (make-vector (shr-max-columns cont) 1)))
    (dolist (row cont)
      (when (eq (car row) 'tr)
	(let ((i 0))
	  (dolist (column (cdr row))
	    (when (memq (car column) '(td th))
	      (let ((width (cdr (assq :width (cdr column)))))
		(when (and width
			   (string-match "\\([0-9]+\\)%" width))
		  (aset columns i
			(/ (string-to-number (match-string 1 width))
937 938
			   100.0))))
	      (setq i (1+ i)))))))
939 940 941 942 943 944 945 946 947 948 949 950 951
    columns))

(defun shr-count (cont elem)
  (let ((i 0))
    (dolist (sub cont)
      (when (eq (car sub) elem)
	(setq i (1+ i))))
    i))

(defun shr-max-columns (cont)
  (let ((max 0))
    (dolist (row cont)
      (when (eq (car row) 'tr)
952 953
	(setq max (max max (+ (shr-count (cdr row) 'td)
			      (shr-count (cdr row) 'th))))))
954 955
    max))

956
(provide 'shr)
957 958

;;; shr.el ends here