--- /dev/null
+;;; css-mode.el --- Major mode to edit CSS files
+
+;; Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+
+;; Author: Stefan Monnier <monnier@iro.umontreal.ca>
+;; Keywords: hypermedia
+
+;; This file 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 2, or (at your option)
+;; any later version.
+
+;; This file 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; see the file COPYING. If not, write to
+;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; Yet another CSS mode.
+
+;;; Todo:
+
+;; - electric ; and }
+;; - filling code with auto-fill-mode
+;; - completion
+;; - fix font-lock errors with multi-line selectors
+
+;;; Code:
+
+(defun css-extract-keyword-list (res)
+ (with-temp-buffer
+ (url-insert-file-contents "http://www.w3.org/TR/REC-CSS2/css2.txt")
+ (goto-char (point-max))
+ (search-backward "Appendix H. Index")
+ (forward-line)
+ (delete-region (point-min) (point))
+ (let ((result nil)
+ keys)
+ (dolist (re res)
+ (goto-char (point-min))
+ (setq keys nil)
+ (while (re-search-forward (cdr re) nil t)
+ (push (match-string 1) keys))
+ (push (cons (car re) (sort keys 'string-lessp)) result))
+ (nreverse result))))
+
+(defun css-extract-parse-val-grammar (string env)
+ (let ((start 0)
+ (elems ())
+ name)
+ (while (string-match
+ (concat "\\(?:"
+ (concat "<a [^>]+><span [^>]+>\\(?:"
+ "<\\([^&]+\\)>\\|'\\([^']+\\)'"
+ "\\)</span></a>")
+ "\\|" "\\(\\[\\)"
+ "\\|" "\\(]\\)"
+ "\\|" "\\(||\\)"
+ "\\|" "\\(|\\)"
+ "\\|" "\\([*+?]\\)"
+ "\\|" "\\({[^}]+}\\)"
+ "\\|" "\\(\\w+\\(?:-\\w+\\)*\\)"
+ "\\)[ \t\n]*")
+ string start)
+ ;; (assert (eq start (match-beginning 0)))
+ (setq start (match-end 0))
+ (cond
+ ;; Reference to a type of value.
+ ((setq name (match-string-no-properties 1 string))
+ (push (intern name) elems))
+ ;; Reference to another property's values.
+ ((setq name (match-string-no-properties 2 string))
+ (setq elems (delete-dups (append (cdr (assoc name env)) elems))))
+ ;; A literal
+ ((setq name (match-string-no-properties 9 string))
+ (push name elems))
+ ;; We just ignore the rest. I.e. we ignore the structure because
+ ;; it's too difficult to exploit anyway (it would allow us to only
+ ;; complete top/center/bottom after one of left/center/right and
+ ;; vice-versa).
+ (t nil)))
+ elems))
+
+
+(defun css-extract-props-and-vals ()
+ (with-temp-buffer
+ (url-insert-file-contents "http://www.w3.org/TR/CSS21/propidx.html")
+ (goto-char (point-min))
+ (let ((props ()))
+ (while (re-search-forward "#propdef-\\([^\"]+\\)\"><span class=\"propinst-\\1 xref\">'\\1'</span></a>" nil t)
+ (let ((prop (match-string-no-properties 1)))
+ (save-excursion
+ (goto-char (match-end 0))
+ (search-forward "<td>")
+ (let ((vals-string (buffer-substring (point)
+ (progn
+ (re-search-forward "[ \t\n]+|[ \t\n]+<a href=\"cascade.html#value-def-inherit\" class=\"noxref\"><span class=\"value-inst-inherit\">inherit</span></a>")
+ (match-beginning 0)))))
+ ;;
+ (push (cons prop (css-extract-parse-val-grammar vals-string props))
+ props)))))
+ props)))
+
+;; Extraction was done with:
+;; (css-extract-keyword-list
+;; '((pseudo . "^ +\\* :\\([^ \n,]+\\)")
+;; (at . "^ +\\* @\\([^ \n,]+\\)")
+;; (descriptor . "^ +\\* '\\([^ '\n]+\\)' (descriptor)")
+;; (media . "^ +\\* '\\([^ '\n]+\\)' media group")
+;; (property . "^ +\\* '\\([^ '\n]+\\)',")))
+
+(defconst css-pseudo-ids
+ '("active" "after" "before" "first" "first-child" "first-letter" "first-line"
+ "focus" "hover" "lang" "left" "link" "right" "visited")
+ "Identifiers for pseudo-elements and pseudo-classes.")
+
+(defconst css-at-ids
+ '("charset" "font-face" "import" "media" "page")
+ "Identifiers that appear in the form @foo.")
+
+(defconst css-descriptor-ids
+ '("ascent" "baseline" "bbox" "cap-height" "centerline" "definition-src"
+ "descent" "font-family" "font-size" "font-stretch" "font-style"
+ "font-variant" "font-weight" "mathline" "panose-1" "slope" "src" "stemh"
+ "stemv" "topline" "unicode-range" "units-per-em" "widths" "x-height")
+ "Identifiers for font descriptors.")
+
+(defconst css-media-ids
+ '("all" "aural" "bitmap" "continuous" "grid" "paged" "static" "tactile"
+ "visual")
+ "Identifiers for types of media.")
+
+(defconst css-property-ids
+ '("azimuth" "background" "background-attachment" "background-color"
+ "background-image" "background-position" "background-repeat" "block"
+ "border" "border-bottom" "border-bottom-color" "border-bottom-style"
+ "border-bottom-width" "border-collapse" "border-color" "border-left"
+ "border-left-color" "border-left-style" "border-left-width" "border-right"
+ "border-right-color" "border-right-style" "border-right-width"
+ "border-spacing" "border-style" "border-top" "border-top-color"
+ "border-top-style" "border-top-width" "border-width" "bottom"
+ "caption-side" "clear" "clip" "color" "compact" "content"
+ "counter-increment" "counter-reset" "cue" "cue-after" "cue-before"
+ "cursor" "dashed" "direction" "display" "dotted" "double" "elevation"
+ "empty-cells" "float" "font" "font-family" "font-size" "font-size-adjust"
+ "font-stretch" "font-style" "font-variant" "font-weight" "groove" "height"
+ "hidden" "inline" "inline-table" "inset" "left" "letter-spacing"
+ "line-height" "list-item" "list-style" "list-style-image"
+ "list-style-position" "list-style-type" "margin" "margin-bottom"
+ "margin-left" "margin-right" "margin-top" "marker-offset" "marks"
+ "max-height" "max-width" "min-height" "min-width" "orphans" "outline"
+ "outline-color" "outline-style" "outline-width" "outset" "overflow"
+ "padding" "padding-bottom" "padding-left" "padding-right" "padding-top"
+ "page" "page-break-after" "page-break-before" "page-break-inside" "pause"
+ "pause-after" "pause-before" "pitch" "pitch-range" "play-during" "position"
+ "quotes" "richness" "ridge" "right" "run-in" "size" "solid" "speak"
+ "speak-header" "speak-numeral" "speak-punctuation" "speech-rate" "stress"
+ "table" "table-caption" "table-cell" "table-column" "table-column-group"
+ "table-footer-group" "table-header-group" "table-layout" "table-row"
+ "table-row-group" "text-align" "text-decoration" "text-indent"
+ "text-shadow" "text-transform" "top" "unicode-bidi" "vertical-align"
+ "visibility" "voice-family" "volume" "white-space" "widows" "width"
+ "word-spacing" "z-index")
+ "Identifiers for properties.")
+
+(defcustom css-electrick-keys '(?\} ?\;) ;; '()
+ "Self inserting keys which should trigger re-indentation."
+ :type '(repeat character)
+ :options '((?\} ?\;)))
+
+(defvar css-mode-syntax-table
+ (let ((st (make-syntax-table)))
+ ;; C-style comments.
+ (modify-syntax-entry ?/ ". 14" st)
+ (modify-syntax-entry ?* ". 23" st)
+ ;; Strings.
+ (modify-syntax-entry ?\" "\"" st)
+ (modify-syntax-entry ?\' "\"" st)
+ ;; Blocks.
+ (modify-syntax-entry ?\{ "(}" st)
+ (modify-syntax-entry ?\} "){" st)
+ ;; Args in url(...) thingies and other "function calls".
+ (modify-syntax-entry ?\( "()" st)
+ (modify-syntax-entry ?\) ")(" st)
+ ;; To match attributes in selectors.
+ (modify-syntax-entry ?\[ "(]" st)
+ (modify-syntax-entry ?\] ")[" st)
+ ;; Special chars that sometimes come at the beginning of words.
+ (modify-syntax-entry ?@ "'" st)
+ ;; (modify-syntax-entry ?: "'" st)
+ (modify-syntax-entry ?# "'" st)
+ ;; Distinction between words and symbols.
+ (modify-syntax-entry ?- "_" st)
+ st))
+
+(defconst css-escapes-re
+ "\\\\\\(?:[^\000-\037\177]\\|[0-9a-fA-F]+[ \n\t\r\f]?\\)")
+(defconst css-nmchar-re (concat "\\(?:[-[:alnum:]]\\|" css-escapes-re "\\)"))
+(defconst css-nmstart-re (concat "\\(?:[[:alpha:]]\\|" css-escapes-re "\\)"))
+(defconst css-ident-re (concat css-nmstart-re css-nmchar-re "*"))
+(defconst css-name-re (concat css-nmchar-re "+"))
+
+(defface css-selector '((t :inherit font-lock-function-name-face))
+ "Face to use for selectors.")
+(defface css-property '((t :inherit font-lock-variable-name-face))
+ "Face to use for properties.")
+
+(defvar css-font-lock-keywords
+ `(("!\\s-*important" . font-lock-builtin-face)
+ ;; Atrules keywords. IDs not in css-at-ids are valid (ignored).
+ ;; In fact the regexp should probably be
+ ;; (,(concat "\\(@" css-ident-re "\\)\\([ \t\n][^;{]*\\)[;{]")
+ ;; (1 font-lock-builtin-face))
+ ;; Since "An at-rule consists of everything up to and including the next
+ ;; semicolon (;) or the next block, whichever comes first."
+ (,(concat "@" css-ident-re) . font-lock-builtin-face)
+ ;; Selectors.
+ ;; FIXME: attribute selectors don't work well because they may contain
+ ;; strings which have already been highlighted as f-l-string-face and
+ ;; thus prevent this highlighting from being applied (actually now that
+ ;; I use `append' this should work better). But really the part of hte
+ ;; selector between [...] should simply not be highlighted.
+ (,(concat "^\\([ \t]*[^@:{\n][^:{\n]+\\(?::" (regexp-opt css-pseudo-ids t)
+ "\\(?:([^)]+)\\)?[^:{\n]*\\)*\\)\\(?:\n[ \t]*\\)*{")
+ (1 'css-selector append))
+ ;; In the above rule, we allow the open-brace to be on some subsequent
+ ;; line. This will only work if we properly mark the intervening text
+ ;; as being part of a multiline element (and even then, this only
+ ;; ensures proper refontification, but not proper discovery).
+ ("^[ \t]*{" (0 (save-excursion
+ (goto-char (match-beginning 0))
+ (skip-chars-backward " \n\t")
+ (put-text-property (point) (match-end 0)
+ 'font-lock-multiline t)
+ ;; No face.
+ nil)))
+ ;; Properties. Again, we don't limit ourselves to css-property-ids.
+ (,(concat "\\(?:[{;]\\|^\\)[ \t]*\\(" css-ident-re "\\)\\s-*:")
+ (1 'css-property))))
+
+(defvar css-font-lock-defaults
+ '(css-font-lock-keywords nil t))
+
+(unless (fboundp 'prog-mode) (defalias 'prog-mode 'fundamental-mode))
+
+;;;###autoload (add-to-list 'auto-mode-alist '("\\.css\\'" . css-mode))
+;;;###autoload
+(define-derived-mode css-mode prog-mode "CSS"
+ "Major mode to edit Cascading Style Sheets."
+ (set (make-local-variable 'font-lock-defaults) css-font-lock-defaults)
+ (set (make-local-variable 'comment-start) "/*")
+ (set (make-local-variable 'comment-start-skip) "/\\*+[ \t]*")
+ (set (make-local-variable 'comment-end) "*/")
+ (set (make-local-variable 'comment-end-skip) "[ \t]*\\*+/")
+ (set (make-local-variable 'forward-sexp-function) 'css-forward-sexp)
+ (set (make-local-variable 'parse-sexp-ignore-comments) t)
+ (set (make-local-variable 'indent-line-function) 'css-indent-line)
+ (set (make-local-variable 'fill-paragraph-function)
+ 'css-fill-paragraph)
+ (when css-electrick-keys
+ (let ((fc (make-char-table 'auto-fill-chars)))
+ (set-char-table-parent fc auto-fill-chars)
+ (dolist (c css-electrick-keys)
+ (aset fc c 'indent-according-to-mode))
+ (set (make-local-variable 'auto-fill-chars) fc))))
+
+(defun css-fill-paragraph (&optional justify)
+ (save-excursion
+ (let ((ppss (syntax-ppss))
+ (eol (line-end-position)))
+ (cond
+ ((and (nth 4 ppss)
+ (save-excursion
+ (goto-char (nth 8 ppss))
+ (forward-comment 1)
+ (prog1 (not (bolp))
+ (setq eol (point)))))
+ ;; Filling inside a comment whose comment-end marker is not \n.
+ ;; This code is meant to be generic, so that it works not only for
+ ;; css-mode but for all modes.
+ (save-restriction
+ (narrow-to-region (nth 8 ppss) eol)
+ (comment-normalize-vars)
+ (let ((fill-paragraph-function nil)
+ (paragraph-separate
+ (if (and comment-continue
+ (string-match "[^ \t]" comment-continue))
+ (concat "\\(?:[ \t]*" (regexp-quote comment-continue)
+ "\\)?\\(?:" paragraph-separate "\\)")
+ paragraph-separate))
+ (paragraph-start
+ (if (and comment-continue
+ (string-match "[^ \t]" comment-continue))
+ (concat "\\(?:[ \t]*" (regexp-quote comment-continue)
+ "\\)?\\(?:" paragraph-start "\\)")
+ paragraph-start)))
+ (fill-paragraph justify)
+ ;; Don't try filling again.
+ t)))
+
+ ((and (null (nth 8 ppss))
+ (or (nth 1 ppss)
+ (and (ignore-errors
+ (down-list 1)
+ (when (<= (point) eol)
+ (setq ppss (syntax-ppss)))))))
+ (goto-char (nth 1 ppss))
+ (let ((end (save-excursion
+ (ignore-errors (forward-sexp 1) (copy-marker (point) t)))))
+ (when end
+ (while (re-search-forward "[{;}]" end t)
+ (cond
+ ;; This is a false positive inside a string or comment.
+ ((nth 8 (syntax-ppss)) nil)
+ ((eq (char-before) ?\})
+ (save-excursion
+ (forward-char -1)
+ (skip-chars-backward " \t")
+ (unless (bolp) (newline))))
+ (t
+ (while
+ (progn
+ (setq eol (line-end-position))
+ (and (forward-comment 1)
+ (> (point) eol)
+ ;; A multi-line comment should be on its own line.
+ (save-excursion (forward-comment -1)
+ (when (< (point) eol)
+ (newline)
+ t)))))
+ (if (< (point) eol) (newline)))))
+ (goto-char (nth 1 ppss))
+ (indent-region (line-beginning-position 2) end)
+ ;; Don't use the default filling code.
+ t)))))))
+
+;;; Navigation and indentation.
+
+(defconst css-navigation-syntax-table
+ (let ((st (make-syntax-table css-mode-syntax-table)))
+ (map-char-table (lambda (c v)
+ ;; Turn punctuation (code = 1) into symbol (code = 1).
+ (if (eq (car-safe v) 1)
+ (aset st c (cons 3 (cdr v)))))
+ st)
+ st))
+
+(defun css-backward-sexp (n)
+ (let ((forward-sexp-function nil))
+ (if (< n 0) (css-forward-sexp (- n))
+ (while (> n 0)
+ (setq n (1- n))
+ (forward-comment (- (point-max)))
+ (if (not (eq (char-before) ?\;))
+ (backward-sexp 1)
+ (while (progn (backward-sexp 1)
+ (save-excursion
+ (forward-comment (- (point-max)))
+ ;; FIXME: We should also skip punctuation.
+ (not (memq (char-before) '(?\; ?\{)))))))))))
+
+(defun css-forward-sexp (n)
+ (let ((forward-sexp-function nil))
+ (if (< n 0) (css-backward-sexp (- n))
+ (while (> n 0)
+ (setq n (1- n))
+ (forward-comment (point-max))
+ (if (not (eq (char-after) ?\;))
+ (forward-sexp 1)
+ (while (progn (forward-sexp 1)
+ (save-excursion
+ (forward-comment (point-max))
+ ;; FIXME: We should also skip punctuation.
+ (not (memq (char-after) '(?\; ?\})))))))))))
+
+(defun css-indent-calculate-virtual ()
+ (if (or (save-excursion (skip-chars-backward " \t") (bolp))
+ (if (looking-at "\\s(")
+ (save-excursion
+ (forward-char 1) (skip-chars-forward " \t")
+ (not (or (eolp) (looking-at comment-start-skip))))))
+ (current-column)
+ (css-indent-calculate)))
+
+(defcustom css-indent-offset 4
+ "Basic size of one indentation step."
+ :type 'integer)
+
+(defun css-indent-calculate ()
+ (let ((ppss (syntax-ppss))
+ pos)
+ (with-syntax-table css-navigation-syntax-table
+ (save-excursion
+ (cond
+ ;; Inside a string.
+ ((nth 3 ppss) 'noindent)
+ ;; Inside a comment.
+ ((nth 4 ppss)
+ (setq pos (point))
+ (forward-line -1)
+ (skip-chars-forward " \t")
+ (if (>= (nth 8 ppss) (point))
+ (progn
+ (goto-char (nth 8 ppss))
+ (if (eq (char-after pos) ?*)
+ (forward-char 1)
+ (if (not (looking-at comment-start-skip))
+ (error "Internal css-mode error")
+ (goto-char (match-end 0))))
+ (current-column))
+ (if (and (eq (char-after pos) ?*) (eq (char-after) ?*))
+ (current-column)
+ ;; 'noindent
+ (current-column)
+ )))
+ ;; In normal code.
+ (t
+ (or
+ (when (looking-at "\\s)")
+ (forward-char 1)
+ (backward-sexp 1)
+ (css-indent-calculate-virtual))
+ (when (looking-at comment-start-skip)
+ (forward-comment (point-max))
+ (css-indent-calculate))
+ (when (save-excursion (forward-comment (- (point-max)))
+ (setq pos (point))
+ (eq (char-syntax (preceding-char)) ?\())
+ (goto-char (1- pos))
+ (if (not (looking-at "\\s([ \t]*"))
+ (error "Internal css-mode error")
+ (if (or (memq (char-after (match-end 0)) '(?\n nil))
+ (save-excursion (goto-char (match-end 0))
+ (looking-at comment-start-skip)))
+ (+ (css-indent-calculate-virtual) css-indent-offset)
+ (progn (goto-char (match-end 0)) (current-column)))))
+ (progn
+ (css-backward-sexp 1)
+ (if (looking-at "\\s(")
+ (css-indent-calculate)
+ (css-indent-calculate-virtual))))))))))
+
+
+(defun css-indent-line ()
+ "Indent current line according to CSS indentation rules."
+ (interactive)
+ (let* ((savep (point))
+ (forward-sexp-function nil)
+ (indent (condition-case nil
+ (save-excursion
+ (forward-line 0)
+ (skip-chars-forward " \t")
+ (if (>= (point) savep) (setq savep nil))
+ (css-indent-calculate))
+ (error nil))))
+ (if (not (numberp indent)) 'noindent
+ (if savep
+ (save-excursion (indent-line-to indent))
+ (indent-line-to indent)))))
+
+(provide 'css-mode)
+;; arch-tag: b4d8b8e2-b130-4e74-b3aa-cd8f1ab659d0
+;;; css-mode.el ends here
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