1 ;;; context-coloring.el --- Highlight by scope -*- lexical-binding: t; -*-
3 ;; Copyright (C) 2014-2015 Free Software Foundation, Inc.
5 ;; Author: Jackson Ray Hamilton <jackson@jacksonrayhamilton.com>
7 ;; Keywords: convenience faces tools
8 ;; Package-Requires: ((emacs "24") (js2-mode "20150126"))
9 ;; URL: https://github.com/jacksonrayhamilton/context-coloring
11 ;; This file is part of GNU Emacs.
13 ;; This program is free software; you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation, either version 3 of the License, or
16 ;; (at your option) any later version.
18 ;; This program is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with this program. If not, see <http://www.gnu.org/licenses/>.
28 ;; Highlights code by scope. Top-level scopes are one color, second-level
29 ;; scopes are another color, and so on. Variables retain the color of the scope
30 ;; in which they are defined. A variable defined in an outer scope referenced
31 ;; by an inner scope is colored the same as the outer scope.
33 ;; By default, comments and strings are still highlighted syntactically.
42 (defun context-coloring-join (strings delimiter)
43 "Join a list of STRINGS with the string DELIMITER."
44 (mapconcat 'identity strings delimiter))
46 (defsubst context-coloring-trim-right (string)
47 "Remove leading whitespace from STRING."
48 (if (string-match "[ \t\n\r]+\\'" string)
49 (replace-match "" t t string)
52 (defsubst context-coloring-trim-left (string)
53 "Remove trailing whitespace from STRING."
54 (if (string-match "\\`[ \t\n\r]+" string)
55 (replace-match "" t t string)
58 (defsubst context-coloring-trim (string)
59 "Remove leading and trailing whitespace from STRING."
60 (context-coloring-trim-left (context-coloring-trim-right string)))
65 (defun context-coloring-defface (level tty light dark)
66 "Define a face for LEVEL with colors for TTY, LIGHT and DARK
68 (let ((face (intern (format "context-coloring-level-%s-face" level)))
69 (doc (format "Context coloring face, level %s." level)))
72 `((((type tty)) (:foreground ,tty))
73 (((background light)) (:foreground ,light))
74 (((background dark)) (:foreground ,dark)))
76 :group 'context-coloring)))
78 (defun context-coloring-defface-neutral (level)
79 "Define a face for LEVEL with the default neutral colors."
80 (context-coloring-defface level nil "#3f3f3f" "#cdcdcd"))
82 (context-coloring-defface 0 nil "#000000" "#ffffff")
83 (context-coloring-defface 1 "yellow" "#008b8b" "#00ffff")
84 (context-coloring-defface 2 "green" "#0000ff" "#87cefa")
85 (context-coloring-defface 3 "cyan" "#483d8b" "#b0c4de")
86 (context-coloring-defface 4 "blue" "#a020f0" "#eedd82")
87 (context-coloring-defface 5 "magenta" "#a0522d" "#98fb98")
88 (context-coloring-defface 6 "red" "#228b22" "#7fffd4")
89 (context-coloring-defface-neutral 7)
91 (defvar context-coloring-maximum-face nil
92 "Index of the highest face available for coloring.")
94 (defvar context-coloring-original-maximum-face nil
95 "Fallback value for `context-coloring-maximum-face' when all
96 themes have been disabled.")
98 (setq context-coloring-maximum-face 7)
100 (setq context-coloring-original-maximum-face
101 context-coloring-maximum-face)
103 ;; Theme authors can have up to 26 levels: 1 (0th) for globals, 24 (1st-24th)
104 ;; for nested levels, and 1 (25th) for infinity.
106 (context-coloring-defface-neutral (+ number context-coloring-maximum-face 1)))
111 (defsubst context-coloring-level-face (level)
112 "Return the symbol for a face with LEVEL."
113 ;; `concat' is faster than `format' here.
115 (concat "context-coloring-level-" (number-to-string level) "-face")))
117 (defsubst context-coloring-bounded-level-face (level)
118 "Return the symbol for a face with LEVEL, bounded by
119 `context-coloring-maximum-face'."
120 (context-coloring-level-face (min level context-coloring-maximum-face)))
123 ;;; Colorization utilities
125 (defsubst context-coloring-colorize-region (start end level)
126 "Color characters from the 1-indexed START point (inclusive) to
127 the END point (exclusive) with the face corresponding to LEVEL."
131 `(face ,(context-coloring-bounded-level-face level))))
133 (make-obsolete-variable
134 'context-coloring-comments-and-strings
135 "use `context-coloring-syntactic-comments' and
136 `context-coloring-syntactic-strings' instead."
139 (defcustom context-coloring-syntactic-comments t
140 "If non-nil, also color comments using `font-lock'."
141 :group 'context-coloring)
143 (defcustom context-coloring-syntactic-strings t
144 "If non-nil, also color strings using `font-lock'."
145 :group 'context-coloring)
147 (defun context-coloring-font-lock-syntactic-comment-function (state)
148 "Tell `font-lock' to color a comment but not a string."
149 (if (nth 3 state) nil font-lock-comment-face))
151 (defun context-coloring-font-lock-syntactic-string-function (state)
152 "Tell `font-lock' to color a string but not a comment."
153 (if (nth 3 state) font-lock-string-face nil))
155 (defsubst context-coloring-maybe-colorize-comments-and-strings (&optional min max)
156 "Color the current buffer's comments or strings if
157 `context-coloring-syntactic-comments' or
158 `context-coloring-syntactic-strings' are non-nil."
159 (when (or context-coloring-syntactic-comments
160 context-coloring-syntactic-strings)
161 (let ((min (or min (point-min)))
162 (max (or max (point-max)))
163 (font-lock-syntactic-face-function
165 ((and context-coloring-syntactic-comments
166 (not context-coloring-syntactic-strings))
167 'context-coloring-font-lock-syntactic-comment-function)
168 ((and context-coloring-syntactic-strings
169 (not context-coloring-syntactic-comments))
170 'context-coloring-font-lock-syntactic-string-function)
172 font-lock-syntactic-face-function))))
174 (font-lock-fontify-syntactically-region min max)
175 ;; TODO: Make configurable at the dispatch level.
176 (when (eq major-mode 'emacs-lisp-mode)
177 (font-lock-fontify-keywords-region min max))))))
180 ;;; js2-mode colorization
182 (defvar-local context-coloring-js2-scope-level-hash-table nil
183 "Associate `js2-scope' structures and with their scope
186 (defcustom context-coloring-js-block-scopes nil
187 "If non-nil, also color block scopes in the scope hierarchy in JavaScript.
189 The block-scoped `let' and `const' are introduced in ES6. Enable
190 this for ES6 code; disable it elsewhere.
192 Supported modes: `js2-mode'"
193 :group 'context-coloring)
195 (defsubst context-coloring-js2-scope-level (scope)
196 "Return the level of SCOPE."
197 (cond ((gethash scope context-coloring-js2-scope-level-hash-table))
200 (current-scope scope)
202 (while (and current-scope
203 (js2-node-parent current-scope)
204 (setq enclosing-scope
205 (js2-node-get-enclosing-scope current-scope)))
206 (when (or context-coloring-js-block-scopes
207 (let ((type (js2-scope-type current-scope)))
208 (or (= type js2-SCRIPT)
209 (= type js2-FUNCTION)
210 (= type js2-CATCH))))
211 (setq level (+ level 1)))
212 (setq current-scope enclosing-scope))
213 (puthash scope level context-coloring-js2-scope-level-hash-table)))))
215 (defsubst context-coloring-js2-local-name-node-p (node)
216 "Determine if NODE is a `js2-name-node' representing a local
218 (and (js2-name-node-p node)
219 (let ((parent (js2-node-parent node)))
220 (not (or (and (js2-object-prop-node-p parent)
221 (eq node (js2-object-prop-node-left parent)))
222 (and (js2-prop-get-node-p parent)
223 ;; For nested property lookup, the node on the left is a
224 ;; `js2-prop-get-node', so this always works.
225 (eq node (js2-prop-get-node-right parent))))))))
227 (defvar-local context-coloring-point-max nil
228 "Cached value of `point-max'.")
230 (defsubst context-coloring-js2-colorize-node (node level)
231 "Color NODE with the color for LEVEL."
232 (let ((start (js2-node-abs-pos node)))
233 (context-coloring-colorize-region
237 (+ start (js2-node-len node))
238 ;; Somes nodes (like the ast when there is an unterminated multiline
239 ;; comment) will stretch to the value of `point-max'.
240 context-coloring-point-max)
243 (defun context-coloring-js2-colorize ()
244 "Color the current buffer using the abstract syntax tree
245 generated by `js2-mode'."
246 ;; Reset the hash table; the old one could be obsolete.
247 (setq context-coloring-js2-scope-level-hash-table (make-hash-table :test 'eq))
248 (setq context-coloring-point-max (point-max))
249 (with-silent-modifications
256 (context-coloring-js2-colorize-node
258 (context-coloring-js2-scope-level node)))
259 ((context-coloring-js2-local-name-node-p node)
260 (let* ((enclosing-scope (js2-node-get-enclosing-scope node))
261 (defining-scope (js2-get-defining-scope
263 (js2-name-node-name node))))
264 ;; The tree seems to be walked lexically, so an entire scope will
265 ;; be colored, including its name nodes, before they are reached.
266 ;; Coloring the nodes defined in that scope would be redundant, so
268 (when (not (eq defining-scope enclosing-scope))
269 (context-coloring-js2-colorize-node
271 (context-coloring-js2-scope-level defining-scope))))))
272 ;; The `t' indicates to search children.
274 (context-coloring-maybe-colorize-comments-and-strings)))
277 ;;; Emacs Lisp colorization
279 (defsubst context-coloring-make-scope (depth level)
283 :variables (make-hash-table)))
285 (defsubst context-coloring-scope-get-level (scope)
286 (plist-get scope :level))
288 (defsubst context-coloring-scope-add-variable (scope variable)
289 (puthash variable t (plist-get scope :variables)))
291 (defsubst context-coloring-scope-get-variable (scope variable)
292 (gethash variable (plist-get scope :variables)))
294 (defsubst context-coloring-get-variable-level (scope-stack variable)
297 (while (and scope-stack (not level))
298 (setq scope (car scope-stack))
300 ((context-coloring-scope-get-variable scope variable)
301 (setq level (context-coloring-scope-get-level scope)))
303 (setq scope-stack (cdr scope-stack)))))
304 ;; Assume a global variable.
307 (defsubst context-coloring-make-backtick (end enabled)
312 (defsubst context-coloring-backtick-get-end (backtick)
313 (plist-get backtick :end))
315 (defsubst context-coloring-backtick-get-enabled (backtick)
316 (plist-get backtick :enabled))
318 (defsubst context-coloring-backtick-enabled-p (backtick-stack)
319 (context-coloring-backtick-get-enabled (car backtick-stack)))
321 (defsubst context-coloring-make-let-varlist (depth type)
327 (defsubst context-coloring-let-varlist-get-type (let-varlist)
328 (plist-get let-varlist :type))
330 (defsubst context-coloring-let-varlist-add-var (let-varlist var)
331 (plist-put let-varlist :vars (cons var (plist-get let-varlist :vars))))
333 (defsubst context-coloring-let-varlist-pop-vars (let-varlist)
334 (let ((type (context-coloring-let-varlist-get-type let-varlist))
335 (vars (plist-get let-varlist :vars)))
337 ;; `let' binds all at once at the end.
341 (plist-put let-varlist :vars '())))
342 ;; `let*' binds incrementally.
346 (plist-put let-varlist :vars (cdr vars)))))))
348 (defsubst context-coloring-forward-sws ()
349 "Move forward through whitespace and comments."
350 (while (forward-comment 1)))
352 (defsubst context-coloring-forward-sexp-position ()
353 "Like vanilla `forward-sexp', but just return the position."
354 (scan-sexps (point) 1))
356 (defsubst context-coloring-emacs-lisp-identifier-syntax-p (syntax-code)
357 (or (= 2 syntax-code)
360 (defsubst context-coloring-open-parenthesis-p (syntax-code)
363 (defsubst context-coloring-close-parenthesis-p (syntax-code)
366 (defsubst context-coloring-expression-prefix-p (syntax-code)
369 (defsubst context-coloring-at-open-parenthesis-p ()
370 (= 4 (logand #xFFFF (car (syntax-after (point))))))
372 (defsubst context-coloring-ppss-depth (ppss)
373 ;; Same as (nth 0 ppss).
376 (defsubst context-coloring-at-stack-depth-p (stack depth)
377 (= (plist-get (car stack) :depth) depth))
379 (defsubst context-coloring-exact-regexp (word)
380 "Create a regexp that matches exactly WORD."
381 (concat "\\`" (regexp-quote word) "\\'"))
383 (defsubst context-coloring-exact-or-regexp (words)
384 "Create a regexp that matches any exact word in WORDS."
385 (context-coloring-join
386 (mapcar 'context-coloring-exact-regexp words) "\\|"))
388 (defconst context-coloring-emacs-lisp-defun-regexp
389 (context-coloring-exact-or-regexp
390 '("defun" "defun*" "defsubst" "defmacro"
391 "cl-defun" "cl-defsubst" "cl-defmacro")))
393 (defconst context-coloring-emacs-lisp-lambda-regexp
394 (context-coloring-exact-regexp "lambda"))
396 (defconst context-coloring-emacs-lisp-let-regexp
397 (context-coloring-exact-regexp "let"))
399 (defconst context-coloring-emacs-lisp-let*-regexp
400 (context-coloring-exact-regexp "let*"))
402 (defconst context-coloring-emacs-lisp-arglist-arg-regexp
405 (defconst context-coloring-ignored-word-regexp
406 (concat "\\`[&:-+]?[0-9]\\|" (context-coloring-exact-or-regexp
407 '("t" "nil" "." "?"))))
409 (defconst context-coloring-WORD-CODE 2)
410 (defconst context-coloring-SYMBOL-CODE 3)
411 (defconst context-coloring-OPEN-PARENTHESIS-CODE 4)
412 (defconst context-coloring-CLOSE-PARENTHESIS-CODE 5)
413 (defconst context-coloring-EXPRESSION-PREFIX-CODE 6)
415 (defconst context-coloring-APOSTROPHE-CHAR (string-to-char "'"))
416 (defconst context-coloring-OPEN-PARENTHESIS-CHAR (string-to-char "("))
417 (defconst context-coloring-COMMA-CHAR (string-to-char ","))
418 (defconst context-coloring-BACKTICK-CHAR (string-to-char "`"))
420 (defvar context-coloring-parse-interruptable-p t
421 "Set this to nil to force parse to continue until finished.")
423 (defconst context-coloring-emacs-lisp-iterations-per-pause 1000
424 "Pause after this many iterations to check for user input.
425 If user input is pending, stop the parse. This makes for a
426 smoother user experience for large files.
428 As of this writing, emacs lisp colorization seems to run at about
429 60,000 iterations per second. A default value of 1000 should
430 provide visually \"instant\" updates at 60 frames per second.")
432 (defvar context-coloring-elisp-scope-stack '())
434 (defsubst context-coloring-elisp-make-scope (level)
437 :variables (make-hash-table :test 'equal)))
439 (defsubst context-coloring-elisp-scope-get-level (scope)
440 (plist-get scope :level))
442 (defsubst context-coloring-elisp-scope-add-variable (scope variable)
443 (puthash variable t (plist-get scope :variables)))
445 (defsubst context-coloring-elisp-scope-get-variable (scope variable)
446 (gethash variable (plist-get scope :variables)))
448 (defsubst context-coloring-elisp-get-variable-level (variable)
449 (let* ((scope-stack context-coloring-elisp-scope-stack)
452 (while (and scope-stack (not level))
453 (setq scope (car scope-stack))
455 ((context-coloring-elisp-scope-get-variable scope variable)
456 (setq level (context-coloring-elisp-scope-get-level scope)))
458 (setq scope-stack (cdr scope-stack)))))
459 ;; Assume a global variable.
462 (defun context-coloring-elisp-push-scope ()
463 (push (context-coloring-elisp-make-scope
464 (1+ (context-coloring-elisp-current-scope-level)))
465 context-coloring-elisp-scope-stack))
467 (defun context-coloring-elisp-pop-scope ()
468 (pop context-coloring-elisp-scope-stack))
470 (defun context-coloring-elisp-add-variable (variable)
471 (let ((current-scope (car context-coloring-elisp-scope-stack)))
472 (context-coloring-elisp-scope-add-variable current-scope variable)))
474 (defun context-coloring-elisp-current-scope-level ()
475 (let ((current-scope (car context-coloring-elisp-scope-stack)))
478 (context-coloring-elisp-scope-get-level current-scope))
482 (defun context-coloring-elisp-colorize-defun (&optional anonymous-p)
483 (let ((start (point))
493 (context-coloring-elisp-push-scope)
494 ;; Color the whole sexp.
497 (context-coloring-colorize-region
500 (context-coloring-elisp-current-scope-level))
502 ;; Skip past the "defun".
503 (skip-syntax-forward "^w_")
505 (skip-syntax-forward " ")
508 ;; Check for the defun's name.
509 (setq syntax (syntax-after (point)))
510 (setq syntax-code (syntax-class syntax))
512 ((or (= syntax-code context-coloring-WORD-CODE)
513 (= syntax-code context-coloring-SYMBOL-CODE))
514 ;; Color the defun's name with the top-level color.
515 (setq defun-name-pos (point))
517 (setq defun-name-end (point))
518 (context-coloring-colorize-region defun-name-pos defun-name-end 0)
519 (skip-syntax-forward " "))
528 (setq syntax (syntax-after (point)))
529 (setq syntax-code (syntax-class syntax))
531 ((= syntax-code context-coloring-OPEN-PARENTHESIS-CODE)
533 (skip-syntax-forward " ")
535 (setq syntax (syntax-after (point)))
536 (setq syntax-code (syntax-class syntax))
538 context-coloring-CLOSE-PARENTHESIS-CODE)
540 ((or (= syntax-code context-coloring-WORD-CODE)
541 (= syntax-code context-coloring-SYMBOL-CODE))
542 (setq arg-n-pos (point))
544 (setq arg-n-end (point))
545 (setq arg-n-string (buffer-substring-no-properties
548 (when (string-match-p
549 context-coloring-emacs-lisp-arglist-arg-regexp
551 (context-coloring-elisp-add-variable arg-n-string)))
554 (skip-syntax-forward " "))
555 ;; Skip the closing arglist paren.
557 ;; Colorize the rest of the function.
558 (context-coloring-elisp-colorize-region (point) (1- end))
565 (context-coloring-elisp-pop-scope)))
567 (defun context-coloring-elisp-colorize-lambda ()
568 (context-coloring-elisp-colorize-defun t))
570 (defun context-coloring-elisp-colorize-parenthesized-sexp ()
571 (let ((start (point))
582 (skip-syntax-forward " ")
583 (setq syntax (syntax-after (point)))
584 (setq syntax-code (syntax-class syntax))
585 ;; Figure out if the sexp is a special form.
587 ((or (= syntax-code context-coloring-WORD-CODE)
588 (= syntax-code context-coloring-SYMBOL-CODE))
589 (setq child-0-pos (point))
591 (setq child-0-end (point))
592 (setq child-0-string (buffer-substring-no-properties
596 ((string-match-p context-coloring-emacs-lisp-defun-regexp child-0-string)
598 (context-coloring-elisp-colorize-defun))
599 ((string-match-p context-coloring-emacs-lisp-lambda-regexp child-0-string)
601 (context-coloring-elisp-colorize-lambda))
602 ;; Not a special form; just colorize the remaining region.
604 (context-coloring-colorize-region
607 (context-coloring-elisp-current-scope-level))
608 (context-coloring-elisp-colorize-region (point) (1- end))
615 (defun context-coloring-elisp-colorize-symbol ()
619 (setq symbol-pos (point))
621 (setq symbol-end (point))
622 (setq symbol-string (buffer-substring-no-properties
626 ((string-match-p context-coloring-ignored-word-regexp symbol-string))
628 (context-coloring-colorize-region
631 (context-coloring-elisp-get-variable-level
632 (buffer-substring-no-properties
636 (defun context-coloring-elisp-colorize-expression-prefix ()
640 (setq char (char-after))
642 ((= char context-coloring-APOSTROPHE-CHAR)
644 ((= char context-coloring-BACKTICK-CHAR)
649 (while (> end (progn (forward-char)
651 (setq char (char-after))
652 (when (= char context-coloring-COMMA-CHAR)
654 (skip-syntax-forward " ")
655 (context-coloring-elisp-colorize-sexp)))))))
657 (defun context-coloring-elisp-colorize-sexp ()
660 (setq syntax (syntax-after (point)))
661 (setq syntax-code (syntax-class syntax))
663 ((= syntax-code context-coloring-OPEN-PARENTHESIS-CODE)
664 (context-coloring-elisp-colorize-parenthesized-sexp))
665 ((or (= syntax-code context-coloring-WORD-CODE)
666 (= syntax-code context-coloring-SYMBOL-CODE))
667 (context-coloring-elisp-colorize-symbol))
668 ((= syntax-code context-coloring-EXPRESSION-PREFIX-CODE)
669 (context-coloring-elisp-colorize-expression-prefix))
673 (defun context-coloring-elisp-colorize-region (start end)
677 (while (> end (progn (skip-syntax-forward "^()w_'" end)
679 (setq syntax (syntax-after (point)))
680 (setq syntax-code (syntax-class syntax))
682 ((or (= syntax-code context-coloring-OPEN-PARENTHESIS-CODE)
683 (= syntax-code context-coloring-WORD-CODE)
684 (= syntax-code context-coloring-SYMBOL-CODE)
685 (= syntax-code context-coloring-EXPRESSION-PREFIX-CODE))
686 (context-coloring-elisp-colorize-sexp))
690 (defun context-coloring-elisp-colorize-changed-region (start end)
691 (with-silent-modifications
693 (let ((start (progn (goto-char start)
696 (end (progn (goto-char end)
699 (setq context-coloring-elisp-scope-stack '())
700 (context-coloring-elisp-colorize-region start end)))))
702 (defun context-coloring-elisp-colorize-buffer ()
704 (with-silent-modifications
706 (setq context-coloring-elisp-scope-stack '())
707 (context-coloring-elisp-colorize-region (point-min) (point-max)))))
709 (defalias 'ccecb 'context-coloring-elisp-colorize-buffer)
711 ;; TODO: Add cases for special forms like `cond'.
712 ;; TODO: Backticks only go one level deep.
713 ;; TODO: Refactor this function into smaller, focused ones so we can parse
714 ;; recursively and easily.
715 (defun context-coloring-emacs-lisp-colorize ()
716 "Color the current buffer by parsing emacs lisp sexps."
717 (with-silent-modifications
719 ;; TODO: Can probably make this lazy to the nearest defun.
720 (goto-char (point-min))
721 (let* ((inhibit-point-motion-hooks t)
724 (last-fontified-position (point))
725 beginning-of-current-defun
727 (last-ppss-pos (point))
730 ;; -1 never matches a depth. This is a minor optimization.
731 (scope-stack `(,(context-coloring-make-scope -1 0)))
733 (let-varlist-stack '())
763 (while (> end (progn (skip-syntax-forward "^()w_'" end)
765 ;; Sparingly-executed tasks.
766 (setq iteration-count (1+ iteration-count))
767 (when (zerop (% iteration-count
768 context-coloring-emacs-lisp-iterations-per-pause))
769 ;; Fontify until the end of the current defun because doing it in
770 ;; chunks based soley on point could result in partial
771 ;; re-fontifications over the contents of scopes.
774 (setq end-of-current-defun (point))
776 (setq beginning-of-current-defun (point)))
778 ;; Fontify in chunks.
779 (context-coloring-maybe-colorize-comments-and-strings
780 last-fontified-position
782 ;; We weren't actually in a defun, so don't color the next one, as
783 ;; that could result in `font-lock' properties being added to it.
784 ((> beginning-of-current-defun (point))
787 end-of-current-defun)))
788 (setq last-fontified-position (point))
789 (when (and context-coloring-parse-interruptable-p
791 (throw 'interrupted t)))
793 (setq token-pos (point))
794 (setq token-syntax (syntax-after token-pos))
795 (setq token-syntax-code (logand #xFFFF (car token-syntax)))
796 (setq token-char (char-after))
797 (setq ppss (parse-partial-sexp last-ppss-pos token-pos nil nil ppss))
798 (setq last-ppss-pos token-pos)
801 ;; Resolve an invalid state.
805 (skip-syntax-forward "^\"" end)
810 (skip-syntax-forward "^>" end)
813 ;; Need to check early in case there's a comma.
814 ((context-coloring-expression-prefix-p token-syntax-code)
817 ;; Skip top-level symbols.
818 ((not (or backtick-stack
819 (= token-char context-coloring-BACKTICK-CHAR)))
820 (goto-char (context-coloring-forward-sexp-position)))
821 ;; Push a backtick state.
822 ((or (= token-char context-coloring-BACKTICK-CHAR)
823 (= token-char context-coloring-COMMA-CHAR))
824 (setq backtick-stack (cons (context-coloring-make-backtick
825 (context-coloring-forward-sexp-position)
826 (= token-char context-coloring-BACKTICK-CHAR))
829 ;; Pop a backtick state.
831 (>= (point) (context-coloring-backtick-get-end (car backtick-stack))))
832 (setq backtick-stack (cdr backtick-stack)))
834 ;; Restricted by an enabled backtick.
836 (context-coloring-backtick-enabled-p backtick-stack))
839 ((context-coloring-open-parenthesis-p token-syntax-code)
841 ;; Look for function calls.
842 (context-coloring-forward-sws)
843 (setq child-0-pos (point))
844 (setq child-0-syntax (syntax-after child-0-pos))
845 (setq child-0-syntax-code (logand #xFFFF (car child-0-syntax)))
847 ((context-coloring-emacs-lisp-identifier-syntax-p child-0-syntax-code)
848 (setq one-word-found-p t)
849 (setq child-0-end (scan-sexps child-0-pos 1))
850 (setq child-0-string (buffer-substring-no-properties child-0-pos child-0-end))
852 ;; Parse a var in a `let' varlist.
855 (context-coloring-at-stack-depth-p
857 ;; 1- because we're inside the varlist.
858 (1- (context-coloring-ppss-depth ppss))))
859 (context-coloring-let-varlist-add-var
860 (car let-varlist-stack)
861 (intern child-0-string))
862 (setq let-var-stack (cons (context-coloring-ppss-depth ppss)
864 ((string-match-p context-coloring-emacs-lisp-defun-regexp child-0-string)
866 ((string-match-p context-coloring-emacs-lisp-lambda-regexp child-0-string)
867 (setq in-lambda-p t))
868 ((string-match-p context-coloring-emacs-lisp-let-regexp child-0-string)
870 (setq let-varlist-type 'let))
871 ((string-match-p context-coloring-emacs-lisp-let*-regexp child-0-string)
873 (setq let-varlist-type 'let*)))))
878 (setq scope-stack (cons (context-coloring-make-scope
879 (context-coloring-ppss-depth ppss)
880 (1+ (context-coloring-scope-get-level
883 ;; TODO: Maybe wasteful but doing this conditionally doesn't make
884 ;; much of a difference.
885 (context-coloring-colorize-region token-pos
886 (scan-sexps token-pos 1)
887 (context-coloring-scope-get-level
892 (goto-char child-0-end)
894 ;; Look for a function name.
895 (context-coloring-forward-sws)
896 (setq child-1-pos (point))
897 (setq child-1-syntax (syntax-after child-1-pos))
898 (setq child-1-syntax-code (logand #xFFFF (car child-1-syntax)))
900 ((context-coloring-emacs-lisp-identifier-syntax-p child-1-syntax-code)
901 (setq child-1-end (scan-sexps child-1-pos 1))
902 ;; Defuns are global, so use level 0.
903 (context-coloring-colorize-region child-1-pos child-1-end 0)
904 (goto-char child-1-end))))
905 ;; Look for an arglist.
906 (context-coloring-forward-sws)
907 (when (context-coloring-at-open-parenthesis-p)
908 ;; (Actually it should be `child-1-end' for `lambda'.)
909 (setq child-2-end (context-coloring-forward-sexp-position))
910 (setq defun-arglist (read (buffer-substring-no-properties
914 (setq defun-arg (car defun-arglist))
915 (when (and (symbolp defun-arg)
917 context-coloring-emacs-lisp-arglist-arg-regexp
918 (symbol-name defun-arg)))
919 (context-coloring-scope-add-variable
922 (setq defun-arglist (cdr defun-arglist)))
923 (goto-char child-2-end))
925 (setq in-defun-p nil)
926 (setq in-lambda-p nil))
929 (goto-char child-0-end)
930 ;; Look for a varlist.
931 (context-coloring-forward-sws)
932 (setq child-1-pos (point))
933 (setq child-1-syntax (syntax-after child-1-pos))
934 (setq child-1-syntax-code (logand #xFFFF (car child-1-syntax)))
935 (when (context-coloring-open-parenthesis-p child-1-syntax-code)
936 ;; Begin parsing the varlist.
938 (setq let-varlist-stack (cons (context-coloring-make-let-varlist
939 ;; 1+ because we parsed it at a
941 (1+ (context-coloring-ppss-depth ppss))
946 (setq in-let*-p nil))
949 ;; If there was a word, continue parsing after it.
955 (setq one-word-found-p nil))
957 ((context-coloring-emacs-lisp-identifier-syntax-p token-syntax-code)
958 (setq variable-end (context-coloring-forward-sexp-position))
959 (setq variable-string (buffer-substring-no-properties
963 ;; Ignore constants such as numbers, keywords, t, nil. These can't
964 ;; be rebound, so they should be treated like syntax.
965 ((string-match-p context-coloring-ignored-word-regexp variable-string))
966 ((keywordp (read variable-string)))
968 (setq variable (intern variable-string))
970 ;; Parse a `let' varlist's uninitialized var.
973 (context-coloring-at-stack-depth-p
975 ;; 1- because we're inside the varlist.
976 (1- (context-coloring-ppss-depth ppss))))
977 (setq let-varlist (car let-varlist-stack))
978 (setq let-varlist-type (context-coloring-let-varlist-get-type let-varlist))
980 ;; Defer `let' binding until the end of the varlist.
981 ((eq let-varlist-type 'let)
982 (context-coloring-let-varlist-add-var let-varlist variable))
983 ;; Bind a `let*' right away.
984 ((eq let-varlist-type 'let*)
985 (context-coloring-scope-add-variable (car scope-stack) variable))))
987 (setq variable-scope-level
988 (context-coloring-get-variable-level scope-stack variable))
989 (when (/= variable-scope-level (context-coloring-scope-get-level
991 (context-coloring-colorize-region
994 variable-scope-level))))))
995 (goto-char variable-end))
997 ((context-coloring-close-parenthesis-p token-syntax-code)
999 (setq ppss (parse-partial-sexp last-ppss-pos (point) nil nil ppss))
1000 (setq last-ppss-pos (point))
1001 (setq ppss-depth (context-coloring-ppss-depth ppss))
1002 ;; TODO: Order might matter here but I'm not certain.
1003 (when (context-coloring-at-stack-depth-p scope-stack ppss-depth)
1004 (setq scope-stack (cdr scope-stack)))
1007 (= (car let-var-stack) ppss-depth))
1008 (setq let-var-stack (cdr let-var-stack))
1009 (when (eq (context-coloring-let-varlist-get-type (car let-varlist-stack))
1011 (setq popped-vars (context-coloring-let-varlist-pop-vars
1012 (car let-varlist-stack)))))
1015 (context-coloring-at-stack-depth-p let-varlist-stack ppss-depth))
1016 (setq popped-vars (context-coloring-let-varlist-pop-vars
1017 (car let-varlist-stack)))
1018 (setq let-varlist-stack (cdr let-varlist-stack)))
1020 (context-coloring-scope-add-variable (car scope-stack) (car popped-vars))
1021 (setq popped-vars (cdr popped-vars))))
1024 ;; Fontify the last stretch.
1025 (context-coloring-maybe-colorize-comments-and-strings
1026 last-fontified-position
1030 ;;; Shell command scopification / colorization
1032 (defun context-coloring-apply-tokens (tokens)
1033 "Process a vector of TOKENS to apply context-based coloring to
1034 the current buffer. Tokens are 3 integers: start, end, level.
1035 The vector is flat, with a new token occurring after every 3rd
1037 (with-silent-modifications
1039 (len (length tokens)))
1041 (context-coloring-colorize-region
1043 (elt tokens (+ i 1))
1044 (elt tokens (+ i 2)))
1046 (context-coloring-maybe-colorize-comments-and-strings)))
1048 (defun context-coloring-parse-array (array)
1049 "Parse ARRAY as a flat JSON array of numbers."
1050 (let ((braceless (substring (context-coloring-trim array) 1 -1)))
1052 ((> (length braceless) 0)
1054 (mapcar 'string-to-number (split-string braceless ","))))
1058 (defvar-local context-coloring-scopifier-process nil
1059 "The single scopifier process that can be running.")
1061 (defun context-coloring-kill-scopifier ()
1062 "Kill the currently-running scopifier process."
1063 (when (not (null context-coloring-scopifier-process))
1064 (delete-process context-coloring-scopifier-process)
1065 (setq context-coloring-scopifier-process nil)))
1067 (defun context-coloring-scopify-shell-command (command callback)
1068 "Invoke a scopifier via COMMAND, read its response
1069 asynchronously and invoke CALLBACK with its output."
1071 ;; Prior running tokenization is implicitly obsolete if this function is
1073 (context-coloring-kill-scopifier)
1075 ;; Start the process.
1076 (setq context-coloring-scopifier-process
1077 (start-process-shell-command "scopifier" nil command))
1081 ;; The process may produce output in multiple chunks. This filter
1082 ;; accumulates the chunks into a message.
1084 context-coloring-scopifier-process
1085 (lambda (_process chunk)
1086 (setq output (concat output chunk))))
1088 ;; When the process's message is complete, this sentinel parses it as JSON
1089 ;; and applies the tokens to the buffer.
1090 (set-process-sentinel
1091 context-coloring-scopifier-process
1092 (lambda (_process event)
1093 (when (equal "finished\n" event)
1094 (funcall callback output))))))
1096 (defun context-coloring-send-buffer-to-scopifier ()
1097 "Give the scopifier process its input so it can begin
1099 (process-send-region
1100 context-coloring-scopifier-process
1101 (point-min) (point-max))
1103 context-coloring-scopifier-process))
1105 (defun context-coloring-scopify-and-colorize (command &optional callback)
1106 "Invoke a scopifier via COMMAND with the current buffer's contents,
1107 read the scopifier's response asynchronously and apply a parsed
1108 list of tokens to `context-coloring-apply-tokens'.
1110 Invoke CALLBACK when complete."
1111 (let ((buffer (current-buffer)))
1112 (context-coloring-scopify-shell-command
1115 (let ((tokens (context-coloring-parse-array output)))
1116 (with-current-buffer buffer
1117 (context-coloring-apply-tokens tokens))
1118 (setq context-coloring-scopifier-process nil)
1119 (when callback (funcall callback))))))
1120 (context-coloring-send-buffer-to-scopifier))
1125 (defvar context-coloring-dispatch-hash-table (make-hash-table :test 'eq)
1126 "Map dispatch strategy names to their corresponding property
1127 lists, which contain details about the strategies.")
1129 (defvar context-coloring-mode-hash-table (make-hash-table :test 'eq)
1130 "Map major mode names to dispatch property lists.")
1132 (defun context-coloring-get-dispatch-for-mode (mode)
1133 "Return the dispatch for MODE (or a derivative mode)."
1137 (not (setq dispatch (gethash parent context-coloring-mode-hash-table)))
1138 (setq parent (get parent 'derived-mode-parent))))
1141 (defun context-coloring-define-dispatch (symbol &rest properties)
1142 "Define a new dispatch named SYMBOL with PROPERTIES.
1144 A \"dispatch\" is a property list describing a strategy for
1145 coloring a buffer. There are three possible strategies: Parse
1146 and color in a single function (`:colorizer'), parse in a
1147 function that returns scope data (`:scopifier'), or parse with a
1148 shell command that returns scope data (`:command'). In the
1149 latter two cases, the scope data will be used to automatically
1152 PROPERTIES must include `:modes' and one of `:colorizer',
1153 `:scopifier' or `:command'.
1155 `:modes' - List of major modes this dispatch is valid for.
1157 `:colorizer' - Symbol referring to a function that parses and
1160 `:scopifier' - Symbol referring to a function that parses the
1161 buffer a returns a flat vector of start, end and level data.
1163 `:executable' - Optional name of an executable required by
1166 `:command' - Shell command to execute with the current buffer
1167 sent via stdin, and with a flat JSON array of start, end and
1168 level data returned via stdout.
1170 `:version' - Minimum required version that should be printed when
1171 executing `:command' with a \"--version\" flag. The version
1172 should be numeric, e.g. \"2\", \"19700101\", \"1.2.3\",
1175 `:setup' - Arbitrary code to set up this dispatch when
1176 `context-coloring-mode' is enabled.
1178 `:teardown' - Arbitrary code to tear down this dispatch when
1179 `context-coloring-mode' is disabled."
1180 (let ((modes (plist-get properties :modes))
1181 (colorizer (plist-get properties :colorizer))
1182 (scopifier (plist-get properties :scopifier))
1183 (command (plist-get properties :command)))
1185 (error "No mode defined for dispatch"))
1186 (when (not (or colorizer
1189 (error "No colorizer, scopifier or command defined for dispatch"))
1190 (puthash symbol properties context-coloring-dispatch-hash-table)
1191 (dolist (mode modes)
1192 (puthash mode properties context-coloring-mode-hash-table))))
1197 (defvar context-coloring-colorize-hook nil
1198 "Hooks to run after coloring a buffer.")
1200 (defun context-coloring-colorize (&optional callback)
1201 "Color the current buffer by function context.
1203 Invoke CALLBACK when complete; see `context-coloring-dispatch'."
1205 (context-coloring-dispatch
1207 (when callback (funcall callback))
1208 (run-hooks 'context-coloring-colorize-hook))))
1210 (defvar-local context-coloring-changed nil
1211 "Indication that the buffer has changed recently, which implies
1212 that it should be colored again by
1213 `context-coloring-colorize-idle-timer' if that timer is being
1216 (defun context-coloring-change-function (_start _end _length)
1217 "Register a change so that a buffer can be colorized soon."
1218 ;; Tokenization is obsolete if there was a change.
1219 (context-coloring-kill-scopifier)
1220 (setq context-coloring-changed t))
1222 (defun context-coloring-maybe-colorize (buffer)
1223 "Colorize the current buffer if it has changed."
1224 (when (and (eq buffer (current-buffer))
1225 context-coloring-changed)
1226 (setq context-coloring-changed nil)
1227 (context-coloring-colorize)))
1232 (defun context-coloring-parse-version (string)
1233 "Extract segments of a version STRING into a list. \"v1.0.0\"
1234 produces (1 0 0), \"19700101\" produces (19700101), etc."
1236 (while (string-match "[0-9]+" string)
1237 (setq version (append version
1238 (list (string-to-number (match-string 0 string)))))
1239 (setq string (substring string (match-end 0))))
1242 (defun context-coloring-check-version (expected actual)
1243 "Check that version EXPECTED is less than or equal to ACTUAL."
1244 (let ((expected (context-coloring-parse-version expected))
1245 (actual (context-coloring-parse-version actual))
1248 (while (and continue expected)
1249 (let ((an-expected (car expected))
1250 (an-actual (car actual)))
1252 ((> an-actual an-expected)
1254 (setq continue nil))
1255 ((< an-actual an-expected)
1256 (setq acceptable nil)
1257 (setq continue nil))))
1258 (setq expected (cdr expected))
1259 (setq actual (cdr actual)))
1262 (defvar context-coloring-check-scopifier-version-hook nil
1263 "Hooks to run after checking the scopifier version.")
1265 (defun context-coloring-check-scopifier-version (&optional callback)
1266 "Asynchronously invoke CALLBACK with a predicate indicating
1267 whether the current scopifier version satisfies the minimum
1268 version number required for the current major mode."
1269 (let ((dispatch (context-coloring-get-dispatch-for-mode major-mode)))
1271 (let ((version (plist-get dispatch :version))
1272 (command (plist-get dispatch :command)))
1273 (context-coloring-scopify-shell-command
1274 (context-coloring-join (list command "--version") " ")
1276 (if (context-coloring-check-version version output)
1278 (when callback (funcall callback t)))
1279 (when callback (funcall callback nil)))
1280 (run-hooks 'context-coloring-check-scopifier-version-hook)))))))
1285 (defvar context-coloring-theme-hash-table (make-hash-table :test 'eq)
1286 "Map theme names to theme properties.")
1288 (defun context-coloring-theme-p (theme)
1289 "Return t if THEME is defined, nil otherwise."
1290 (and (gethash theme context-coloring-theme-hash-table)))
1292 (defconst context-coloring-level-face-regexp
1293 "context-coloring-level-\\([[:digit:]]+\\)-face"
1294 "Extract a level from a face.")
1296 (defvar context-coloring-originally-set-theme-hash-table
1297 (make-hash-table :test 'eq)
1298 "Cache custom themes who originally set their own
1299 `context-coloring-level-N-face' faces.")
1301 (defun context-coloring-theme-originally-set-p (theme)
1302 "Return t if there is a `context-coloring-level-N-face'
1303 originally set for THEME, nil otherwise."
1304 (let (originally-set)
1306 ;; `setq' might return a non-nil value for the sake of this `cond'.
1311 context-coloring-originally-set-theme-hash-table))
1312 (eq originally-set 'yes))
1314 (let* ((settings (get theme 'theme-settings))
1317 (while (and tail (not found))
1318 (and (eq (nth 0 (car tail)) 'theme-face)
1320 context-coloring-level-face-regexp
1321 (symbol-name (nth 1 (car tail))))
1323 (setq tail (cdr tail)))
1326 (defun context-coloring-cache-originally-set (theme originally-set)
1327 "Remember if THEME had colors originally set for it. If
1328 ORIGINALLY-SET is non-nil, it did, otherwise it didn't."
1329 ;; Caching whether a theme was originally set is kind of dirty, but we have to
1330 ;; do it to remember the past state of the theme. There are probably some
1331 ;; edge cases where caching will be an issue, but they are probably rare.
1334 (if originally-set 'yes 'no)
1335 context-coloring-originally-set-theme-hash-table))
1337 (defun context-coloring-warn-theme-originally-set (theme)
1338 "Warn the user that the colors for THEME are already originally
1340 (warn "Context coloring colors for theme `%s' are already defined" theme))
1342 (defun context-coloring-theme-highest-level (theme)
1343 "Return the highest level N of a face like
1344 `context-coloring-level-N-face' set for THEME, or `-1' if there
1346 (let* ((settings (get theme 'theme-settings))
1352 (and (eq (nth 0 (car tail)) 'theme-face)
1353 (setq face-string (symbol-name (nth 1 (car tail))))
1355 context-coloring-level-face-regexp
1357 (setq number (string-to-number
1358 (substring face-string
1362 (setq found number))
1363 (setq tail (cdr tail)))
1366 (defun context-coloring-apply-theme (theme)
1367 "Apply THEME's properties to its respective custom theme,
1368 which must already exist and which *should* already be enabled."
1369 (let* ((properties (gethash theme context-coloring-theme-hash-table))
1370 (colors (plist-get properties :colors))
1372 ;; Only clobber when we have to.
1373 (when (custom-theme-enabled-p theme)
1374 (setq context-coloring-maximum-face (- (length colors) 1)))
1376 'custom-theme-set-faces
1380 (setq level (+ level 1))
1381 `(,(context-coloring-level-face level) ((t (:foreground ,color)))))
1384 (defun context-coloring-define-theme (theme &rest properties)
1385 "Define a context theme named THEME for coloring scope levels.
1387 PROPERTIES is a property list specifiying the following details:
1389 `:aliases': List of symbols of other custom themes that these
1390 colors are applicable to.
1392 `:colors': List of colors that this context theme uses.
1394 `:override': If non-nil, this context theme is intentionally
1395 overriding colors set by a custom theme. Don't set this non-nil
1396 unless there is a custom theme you want to use which sets
1397 `context-coloring-level-N-face' faces that you want to replace.
1399 `:recede': If non-nil, this context theme should not apply its
1400 colors if a custom theme already sets
1401 `context-coloring-level-N-face' faces. This option is
1402 optimistic; set this non-nil if you would rather confer the duty
1403 of picking colors to a custom theme author (if / when he ever
1406 By default, context themes will always override custom themes,
1407 even if those custom themes set `context-coloring-level-N-face'
1408 faces. If a context theme does override a custom theme, a
1409 warning will be raised, at which point you may want to enable the
1410 `:override' option, or just delete your context theme and opt to
1411 use your custom theme's author's colors instead.
1413 Context themes only work for the custom theme with the highest
1414 precedence, i.e. the car of `custom-enabled-themes'."
1415 (let ((aliases (plist-get properties :aliases))
1416 (override (plist-get properties :override))
1417 (recede (plist-get properties :recede)))
1418 (dolist (name (append `(,theme) aliases))
1419 (puthash name properties context-coloring-theme-hash-table)
1420 (when (custom-theme-p name)
1421 (let ((originally-set (context-coloring-theme-originally-set-p name)))
1422 (context-coloring-cache-originally-set name originally-set)
1423 ;; In the particular case when you innocently define colors that a
1424 ;; custom theme originally set, warn. Arguably this only has to be
1425 ;; done at enable time, but it is probably more useful to do it at
1426 ;; definition time for prompter feedback.
1427 (when (and originally-set
1430 (context-coloring-warn-theme-originally-set name))
1431 ;; Set (or overwrite) colors.
1432 (when (not (and originally-set
1434 (context-coloring-apply-theme name)))))))
1436 (defun context-coloring-enable-theme (theme)
1437 "Apply THEME if its colors are not already set, else just set
1438 `context-coloring-maximum-face' to the correct value for THEME."
1439 (let* ((properties (gethash theme context-coloring-theme-hash-table))
1440 (recede (plist-get properties :recede))
1441 (override (plist-get properties :override)))
1444 (let ((highest-level (context-coloring-theme-highest-level theme)))
1446 ;; This can be true whether originally set by a custom theme or by a
1448 ((> highest-level -1)
1449 (setq context-coloring-maximum-face highest-level))
1450 ;; It is possible that the corresponding custom theme did not exist at
1451 ;; the time of defining this context theme, and in that case the above
1452 ;; condition proves the custom theme did not originally set any faces,
1453 ;; so we have license to apply the context theme for the first time
1456 (context-coloring-apply-theme theme)))))
1458 (let ((originally-set (context-coloring-theme-originally-set-p theme)))
1459 ;; Cache now in case the context theme was defined after the custom
1461 (context-coloring-cache-originally-set theme originally-set)
1462 (when (and originally-set
1464 (context-coloring-warn-theme-originally-set theme))
1465 (context-coloring-apply-theme theme))))))
1467 (defadvice enable-theme (after context-coloring-enable-theme (theme) activate)
1468 "Enable colors for context themes just-in-time."
1469 (when (and (not (eq theme 'user)) ; Called internally by `enable-theme'.
1470 (custom-theme-p theme) ; Guard against non-existent themes.
1471 (context-coloring-theme-p theme))
1472 (when (= (length custom-enabled-themes) 1)
1473 ;; Cache because we can't reliably figure it out in reverse.
1474 (setq context-coloring-original-maximum-face
1475 context-coloring-maximum-face))
1476 (context-coloring-enable-theme theme)))
1478 (defadvice disable-theme (after context-coloring-disable-theme (theme) activate)
1479 "Update `context-coloring-maximum-face'."
1480 (when (custom-theme-p theme) ; Guard against non-existent themes.
1481 (let ((enabled-theme (car custom-enabled-themes)))
1482 (if (context-coloring-theme-p enabled-theme)
1484 (context-coloring-enable-theme enabled-theme))
1485 ;; Assume we are back to no theme; act as if nothing ever happened.
1486 ;; This is still prone to intervention, but rather extraordinarily.
1487 (setq context-coloring-maximum-face
1488 context-coloring-original-maximum-face)))))
1490 (context-coloring-define-theme
1502 (context-coloring-define-theme
1517 (context-coloring-define-theme
1529 (context-coloring-define-theme
1542 (context-coloring-define-theme
1555 (context-coloring-define-theme
1558 :aliases '(solarized-light
1560 sanityinc-solarized-light
1561 sanityinc-solarized-dark)
1580 (context-coloring-define-theme
1592 (context-coloring-define-theme
1609 (context-coloring-define-theme
1625 ;;; Change detection
1627 (defvar-local context-coloring-colorize-idle-timer nil
1628 "The currently-running idle timer.")
1630 (defcustom context-coloring-delay 0.25
1631 "Delay between a buffer update and colorization.
1633 Increase this if your machine is high-performing. Decrease it if
1636 Supported modes: `js-mode', `js3-mode', `emacs-lisp-mode'"
1637 :group 'context-coloring)
1639 (defun context-coloring-setup-idle-change-detection ()
1640 "Setup idle change detection."
1642 'after-change-functions 'context-coloring-change-function nil t)
1644 'kill-buffer-hook 'context-coloring-teardown-idle-change-detection nil t)
1645 (setq context-coloring-colorize-idle-timer
1646 (run-with-idle-timer
1647 context-coloring-delay
1649 'context-coloring-maybe-colorize
1652 (defun context-coloring-teardown-idle-change-detection ()
1653 "Teardown idle change detection."
1654 (context-coloring-kill-scopifier)
1655 (when context-coloring-colorize-idle-timer
1656 (cancel-timer context-coloring-colorize-idle-timer))
1658 'kill-buffer-hook 'context-coloring-teardown-idle-change-detection t)
1660 'after-change-functions 'context-coloring-change-function t))
1663 ;;; Built-in dispatches
1665 (context-coloring-define-dispatch
1667 :modes '(js-mode js3-mode)
1668 :executable "scopifier"
1669 :command "scopifier"
1672 (context-coloring-define-dispatch
1675 :colorizer 'context-coloring-js2-colorize
1678 (add-hook 'js2-post-parse-callbacks 'context-coloring-colorize nil t))
1681 (remove-hook 'js2-post-parse-callbacks 'context-coloring-colorize t)))
1683 (context-coloring-define-dispatch
1685 :modes '(emacs-lisp-mode)
1686 :colorizer 'context-coloring-elisp-colorize-buffer
1687 :setup 'context-coloring-setup-idle-change-detection
1688 :teardown 'context-coloring-teardown-idle-change-detection)
1690 (defun context-coloring-dispatch (&optional callback)
1691 "Determine the optimal track for scopification / coloring of
1692 the current buffer, then execute it.
1694 Invoke CALLBACK when complete. It is invoked synchronously for
1695 elisp tracks, and asynchronously for shell command tracks."
1696 (let* ((dispatch (context-coloring-get-dispatch-for-mode major-mode))
1697 (colorizer (plist-get dispatch :colorizer))
1698 (scopifier (plist-get dispatch :scopifier))
1699 (command (plist-get dispatch :command))
1702 ((or colorizer scopifier)
1707 (funcall colorizer))
1709 (context-coloring-apply-tokens (funcall scopifier))))))
1712 (setq context-coloring-changed t))
1714 (when callback (funcall callback)))))
1716 (context-coloring-scopify-and-colorize command callback)))))
1722 (define-minor-mode context-coloring-mode
1723 "Context-based code coloring, inspired by Douglas Crockford."
1725 (if (not context-coloring-mode)
1727 (let ((dispatch (context-coloring-get-dispatch-for-mode major-mode)))
1729 (let ((command (plist-get dispatch :command))
1730 (teardown (plist-get dispatch :teardown)))
1732 (context-coloring-teardown-idle-change-detection))
1734 (funcall teardown)))))
1738 ;; Font lock is incompatible with this mode; the converse is also true.
1742 ;; ...but we do use font-lock functions here.
1743 (font-lock-set-defaults)
1745 ;; Safely change the valye of this function as necessary.
1746 (make-local-variable 'font-lock-syntactic-face-function)
1748 (let ((dispatch (context-coloring-get-dispatch-for-mode major-mode)))
1751 (let ((command (plist-get dispatch :command))
1752 (version (plist-get dispatch :version))
1753 (executable (plist-get dispatch :executable))
1754 (setup (plist-get dispatch :setup))
1755 (colorize-initially-p t))
1757 ;; Shell commands recolor on change, idly.
1760 (null (executable-find executable)))
1761 (message "Executable \"%s\" not found" executable)
1762 (setq colorize-initially-p nil))
1764 (context-coloring-check-scopifier-version
1765 (lambda (sufficient-p)
1768 (context-coloring-setup-idle-change-detection)
1769 (context-coloring-colorize))
1770 (message "Update to the minimum version of \"%s\" (%s)"
1771 executable version))))
1772 (setq colorize-initially-p nil))
1774 (context-coloring-setup-idle-change-detection))))
1777 ;; Colorize once initially.
1778 (when colorize-initially-p
1779 (let ((context-coloring-parse-interruptable-p nil))
1780 (context-coloring-colorize)))))
1781 (when (null dispatch)
1782 (message "Context coloring is not available for this major mode"))))))
1784 (provide 'context-coloring)
1786 ;;; context-coloring.el ends here