238 lines
8.1 KiB
EmacsLisp
238 lines
8.1 KiB
EmacsLisp
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;;; sass-mode.el --- Major mode for editing Sass files
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;; Copyright (c) 2007, 2008 Nathan Weizenbaum
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;; Author: Nathan Weizenbaum
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;; URL: http://github.com/nex3/haml/tree/master
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;; Version: 3.0.16
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;; Created: 2007-03-15
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;; By: Nathan Weizenbaum
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;; Keywords: markup, language, css
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;; Package-Requires: ((haml-mode "3.0.15"))
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;;; Commentary:
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;; Because Sass's indentation schema is similar
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;; to that of YAML and Python, many indentation-related
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;; functions are similar to those in yaml-mode and python-mode.
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;; To install, save this on your load path and add the following to
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;; your .emacs file:
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;;
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;; (require 'sass-mode)
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;; sass-mode requires haml-mode, which can be found at http://github.com/nex3/haml-mode.
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;;; Code:
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(require 'haml-mode)
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;; User definable variables
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(defgroup sass nil
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"Support for the Sass template language."
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:group 'languages
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:prefix "sass-")
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(defcustom sass-mode-hook nil
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"Hook run when entering Sass mode."
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:type 'hook
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:group 'sass)
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(defcustom sass-indent-offset 2
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"Amount of offset per level of indentation."
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:type 'integer
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:group 'sass)
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(defvar sass-non-block-openers
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'("^.*,$" ;; Continued selectors
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"^ *@\\(extend\\|debug\\|warn\\|include\\|import\\)" ;; Single-line mixins
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"^ *[$!]" ;; Variables
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"^ *[[:alnum:]\\-]+ *:" ;; Plain attribute values
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)
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"A list of regexps that match lines of Sass that couldn't have
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text nested beneath them.")
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;; Font lock
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(defconst sass-selector-font-lock-keywords
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'(;; Attribute selectors (e.g. p[foo=bar])
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("\\[\\([^]=]+\\)" (1 font-lock-variable-name-face)
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("[~|$^*]?=\\([^]=]+\\)" nil nil (1 font-lock-string-face)))
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("&" 0 font-lock-constant-face)
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("\\.\\w+" 0 font-lock-type-face)
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("#\\w+" 0 font-lock-keyword-face)
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;; Pseudo-selectors, optionally with arguments (e.g. :first, :nth-child(12))
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("\\(::?\\w+\\)" (1 font-lock-function-name-face)
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("(\\([^)]+\\))" nil nil (1 font-lock-string-face)))))
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(defconst sass-script-font-lock-keywords
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`(("\"\\([^\"\\\\]\\|\\\\.\\)*\"" 0 font-lock-string-face)
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("!\\(\\w\\|_\\)+" 0 font-lock-variable-name-face)
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("#[0-9a-fA-F]\\{0,6\\}" 0 font-lock-preprocessor-face)
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(,(regexp-opt
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'("true" "false" "black" "silver" "gray" "white" "maroon" "red"
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"purple" "fuchsia" "green" "lime" "olive" "yellow" "navy"
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"blue" "teal" "aqua"))
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0 font-lock-constant-face)
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(,(regexp-opt '("and" "or" "not")) 0 font-lock-keyword-face)))
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(defconst sass-syntax-table
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(let ((st (make-syntax-table)))
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(modify-syntax-entry ?- "w" st)
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(modify-syntax-entry ?_ "w" st)
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st))
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(defconst sass-script-syntax-table
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(let ((st (make-syntax-table sass-syntax-table)))
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(modify-syntax-entry ?- "." st)
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st))
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(defconst sass-font-lock-keywords
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'((sass-highlight-line 1 nil nil t)))
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(defconst sass-line-keywords
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'(("@\\(\\w+\\)" 0 font-lock-keyword-face sass-highlight-directive)
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("/[/*].*" 0 font-lock-comment-face)
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("[=+]\\w+" 0 font-lock-function-name-face sass-highlight-script-after-match)
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("!\\w+" 0 font-lock-variable-name-face sass-highlight-script-after-match)
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(":\\w+" 0 font-lock-variable-name-face)
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("\\w+\s*:" 0 font-lock-variable-name-face)
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("\\(\\w+\\)\s*=" 1 font-lock-variable-name-face sass-highlight-script-after-match)
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("\\(:\\w+\\)\s*=" 1 font-lock-variable-name-face sass-highlight-script-after-match)
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(".*" sass-highlight-selector))
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"A list of full-line Sass syntax to highlight, used by `sass-highlight-line'.
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Each item is either of the form (REGEXP SUBEXP FACE), (REGEXP FN),
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or (REGEXP SUBEXP FACE FN). Each REGEXP is run successively on the
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beginning of non-whitespace on the current line until one matches.
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If it has SUBEXP and FACE, then SUBEXP is highlighted using FACE.
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If it has FN, FN is run.")
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(defun sass-highlight-line (limit)
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"Highlight a single line using some Sass single-line syntax.
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This syntax is taken from `sass-line-keywords'.
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LIMIT is the limit of the search."
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(save-match-data
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(when (re-search-forward "^ *\\(.+\\)$" limit t)
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(goto-char (match-beginning 1))
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(dolist (keyword sass-line-keywords)
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(destructuring-bind (keyword subexp-or-fn &optional face fn) keyword
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(when (looking-at keyword)
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(if (integerp subexp-or-fn)
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(put-text-property (match-beginning subexp-or-fn)
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(match-end subexp-or-fn)
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'face face)
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(setq fn subexp-or-fn))
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(when fn (funcall fn))
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(end-of-line)
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(return t)))))))
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(defun sass-highlight-selector ()
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"Highlight a CSS selector starting at `point' and ending at `end-of-line'."
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(let ((font-lock-keywords sass-selector-font-lock-keywords)
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font-lock-multiline)
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(font-lock-fontify-region
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(point) (progn (end-of-line) (point))))
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t)
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(defun sass-highlight-script (beg end)
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"Highlight a section of SassScript between BEG and END."
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(save-match-data
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(with-syntax-table sass-script-syntax-table
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(let ((font-lock-keywords sass-script-font-lock-keywords)
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font-lock-syntax-table
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font-lock-extend-region-functions)
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(font-lock-fontify-region beg end)))))
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(defun sass-highlight-script-after-match ()
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"Highlight a section of SassScript after the last match."
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(end-of-line)
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(sass-highlight-script (match-end 0) (point)))
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(defun sass-highlight-directive ()
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"Highlight a Sass directive."
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(goto-char (match-end 0))
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(block nil
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(case (intern (match-string 1))
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(for
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(unless (looking-at " +!\\w+") (return))
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(put-text-property (match-beginning 0) (match-end 0)
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'face font-lock-variable-name-face)
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(goto-char (match-end 0))
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(unless (looking-at " +from") (return))
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(put-text-property (match-beginning 0) (match-end 0)
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'face font-lock-keyword-face)
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(goto-char (match-end 0))
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(when (looking-at " +\\(.+?\\) +\\(to\\|through\\)")
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(sass-highlight-script (match-beginning 1) (match-end 1))
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(put-text-property (match-beginning 2) (match-end 2)
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'face font-lock-keyword-face))
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(sass-highlight-script-after-match))
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(else
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(unless (looking-at " +if") (return))
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(put-text-property (match-beginning 0) (match-end 0)
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'face font-lock-keyword-face)
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(sass-highlight-script-after-match))
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((if while debug) (sass-highlight-script-after-match)))))
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;; Constants
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;; Mode setup
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(defvar sass-mode-map
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(let ((map (make-sparse-keymap)))
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(define-key map "\C-c\C-r" 'sass-output-region)
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(define-key map "\C-c\C-l" 'sass-output-buffer)
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map))
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;;;###autoload
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(define-derived-mode sass-mode haml-mode "Sass"
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"Major mode for editing Sass files.
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\\{sass-mode-map}"
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(set-syntax-table sass-syntax-table)
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(setq font-lock-extend-region-functions
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'(font-lock-extend-region-wholelines font-lock-extend-region-multiline))
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(set (make-local-variable 'font-lock-multiline) nil)
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(set (make-local-variable 'comment-start) "/*")
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(set (make-local-variable 'haml-indent-function) 'sass-indent-p)
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(set (make-local-variable 'haml-indent-offset) sass-indent-offset)
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(setq font-lock-defaults '(sass-font-lock-keywords t t)))
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;; Indentation
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(defun sass-indent-p ()
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"Return non-nil if the current line can have lines nested beneath it."
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(loop for opener in sass-non-block-openers
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if (looking-at opener) return nil
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finally return t))
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;; Command
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(defun sass-output-region (start end)
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"Displays the CSS output for the current block of Sass code.
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Called from a program, START and END specify the region to indent."
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(interactive "r")
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(let ((output-buffer "*sass-output*"))
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(shell-command-on-region start end "sass --stdin" output-buffer)
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(when (fboundp 'css-mode)
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(with-current-buffer output-buffer
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(css-mode)))
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(switch-to-buffer-other-window output-buffer)))
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(defun sass-output-buffer ()
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"Displays the CSS output for entire buffer."
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(interactive)
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(sass-output-region (point-min) (point-max)))
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;;;###autoload
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(add-to-list 'auto-mode-alist '("\\.sass\\'" . sass-mode))
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;; Setup/Activation
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(provide 'sass-mode)
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;;; sass-mode.el ends here
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