lisp/ansi-color.el

   1 ;;; ansi-color.el --- translate ANSI escape sequences into faces
   2
   3 ;; Copyright (C) 1999-2011 Free Software Foundation, Inc.
   4
   5 ;; Author: Alex Schroeder <alex@gnu.org>
   6 ;; Maintainer: Alex Schroeder <alex@gnu.org>
   7 ;; Version: 3.4.2
   8 ;; Keywords: comm processes terminals services
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Commentary:
  26
  27 ;; This file provides a function that takes a string or a region
  28 ;; containing Select Graphic Rendition (SGR) control sequences (formerly
  29 ;; known as ANSI escape sequences) and tries to translate these into
  30 ;; faces.
  31 ;;
  32 ;; This allows you to run ls --color=yes in shell-mode.  It is now
  33 ;; enabled by default; to disable it, set ansi-color-for-comint-mode
  34 ;; to nil.
  35 ;;
  36 ;; Note that starting your shell from within Emacs might set the TERM
  37 ;; environment variable.  The new setting might disable the output of
  38 ;; SGR control sequences.  Using ls --color=yes forces ls to produce
  39 ;; these.
  40 ;;
  41 ;; SGR control sequences are defined in section 3.8.117 of the ECMA-48
  42 ;; standard (identical to ISO/IEC 6429), which is freely available as a
  43 ;; PDF file <URL:http://www.ecma.ch/ecma1/STAND/ECMA-048.HTM>.  The
  44 ;; "Graphic Rendition Combination Mode (GRCM)" implemented is
  45 ;; "cumulative mode" as defined in section 7.2.8.  Cumulative mode means
  46 ;; that whenever possible, SGR control sequences are combined (ie. blue
  47 ;; and bold).
  48
  49 ;; The basic functions are:
  50 ;;
  51 ;; `ansi-color-apply' to colorize a string containing SGR control
  52 ;; sequences.
  53 ;;
  54 ;; `ansi-color-filter-apply' to filter SGR control sequences from a
  55 ;; string.
  56 ;;
  57 ;; `ansi-color-apply-on-region' to colorize a region containing SGR
  58 ;; control sequences.
  59 ;;
  60 ;; `ansi-color-filter-region' to filter SGR control sequences from a
  61 ;; region.
  62
  63 ;;; Thanks
  64
  65 ;; Georges Brun-Cottan <gbruncot@emc.com> for improving ansi-color.el
  66 ;; substantially by adding the code needed to cope with arbitrary chunks
  67 ;; of output and the filter functions.
  68 ;;
  69 ;; Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk> for pointing me to ECMA-48.
  70 ;;
  71 ;; Stefan Monnier <foo@acm.com> explaing obscure font-lock stuff and
  72 ;; code suggestions.
  73
  74 \f
  75
  76 ;;; Code:
  77
  78 (defvar comint-last-output-start)
  79
  80 ;; Customization
  81
  82 (defgroup ansi-colors nil
  83   "Translating SGR control sequences to faces.
  84 This translation effectively colorizes strings and regions based upon
  85 SGR control sequences embedded in the text.  SGR (Select Graphic
  86 Rendition) control sequences are defined in section 3.8.117 of the
  87 ECMA-48 standard \(identical to ISO/IEC 6429), which is freely available
  88 as a PDF file <URL:http://www.ecma.ch/ecma1/STAND/ECMA-048.HTM>."
  89   :version "21.1"
  90   :group 'processes)
  91
  92 (defcustom ansi-color-faces-vector
  93   [default bold default italic underline bold bold-italic modeline]
  94   "Faces used for SGR control sequences determining a face.
  95 This vector holds the faces used for SGR control sequence parameters 0
  96 to 7.
  97
  98 Parameter  Description        Face used by default
  99   0        default            default
 100   1        bold               bold
 101   2        faint              default
 102   3        italic             italic
 103   4        underlined         underline
 104   5        slowly blinking    bold
 105   6        rapidly blinking   bold-italic
 106   7        negative image     modeline
 107
 108 Note that the symbol `default' is special: It will not be combined
 109 with the current face.
 110
 111 This vector is used by `ansi-color-make-color-map' to create a color
 112 map.  This color map is stored in the variable `ansi-color-map'."
 113   :type '(vector face face face face face face face face)
 114   :set 'ansi-color-map-update
 115   :initialize 'custom-initialize-default
 116   :group 'ansi-colors)
 117
 118 (defcustom ansi-color-names-vector
 119   ["black" "red" "green" "yellow" "blue" "magenta" "cyan" "white"]
 120   "Colors used for SGR control sequences determining a color.
 121 This vector holds the colors used for SGR control sequences parameters
 122 30 to 37 \(foreground colors) and 40 to 47 (background colors).
 123
 124 Parameter  Color
 125   30  40   black
 126   31  41   red
 127   32  42   green
 128   33  43   yellow
 129   34  44   blue
 130   35  45   magenta
 131   36  46   cyan
 132   37  47   white
 133
 134 This vector is used by `ansi-color-make-color-map' to create a color
 135 map.  This color map is stored in the variable `ansi-color-map'."
 136   :type '(vector string string string string string string string string)
 137   :set 'ansi-color-map-update
 138   :initialize 'custom-initialize-default
 139   :group 'ansi-colors)
 140
 141 (defconst ansi-color-regexp "\033\\[\\([0-9;]*m\\)"
 142   "Regexp that matches SGR control sequences.")
 143
 144 (defconst ansi-color-drop-regexp
 145   "\033\\[\\([ABCDsuK]\\|2J\\|=[0-9]+[hI]\\|[0-9;]*[Hf]\\)"
 146   "Regexp that matches ANSI control sequences to silently drop.")
 147
 148 (defconst ansi-color-parameter-regexp "\\([0-9]*\\)[m;]"
 149   "Regexp that matches SGR control sequence parameters.")
 150
 151
 152 ;; Convenience functions for comint modes (eg. shell-mode)
 153
 154
 155 (defcustom ansi-color-for-comint-mode t
 156   "Determines what to do with comint output.
 157 If nil, do nothing.
 158 If the symbol `filter', then filter all SGR control sequences.
 159 If anything else (such as t), then translate SGR control sequences
 160 into text properties.
 161
 162 In order for this to have any effect, `ansi-color-process-output' must
 163 be in `comint-output-filter-functions'.
 164
 165 This can be used to enable colorized ls --color=yes output
 166 in shell buffers.  You set this variable by calling one of:
 167 \\[ansi-color-for-comint-mode-on]
 168 \\[ansi-color-for-comint-mode-off]
 169 \\[ansi-color-for-comint-mode-filter]"
 170   :type '(choice (const :tag "Do nothing" nil)
 171                  (const :tag "Filter" filter)
 172                  (const :tag "Translate" t))
 173   :group 'ansi-colors
 174   :version "23.2")
 175
 176 ;;;###autoload
 177 (defun ansi-color-for-comint-mode-on ()
 178   "Set `ansi-color-for-comint-mode' to t."
 179   (interactive)
 180   (setq ansi-color-for-comint-mode t))
 181
 182 (defun ansi-color-for-comint-mode-off ()
 183   "Set `ansi-color-for-comint-mode' to nil."
 184   (interactive)
 185   (setq ansi-color-for-comint-mode nil))
 186
 187 (defun ansi-color-for-comint-mode-filter ()
 188   "Set `ansi-color-for-comint-mode' to symbol `filter'."
 189   (interactive)
 190   (setq ansi-color-for-comint-mode 'filter))
 191
 192 ;;;###autoload
 193 (defun ansi-color-process-output (ignored)
 194   "Maybe translate SGR control sequences of comint output into text properties.
 195
 196 Depending on variable `ansi-color-for-comint-mode' the comint output is
 197 either not processed, SGR control sequences are filtered using
 198 `ansi-color-filter-region', or SGR control sequences are translated into
 199 text properties using `ansi-color-apply-on-region'.
 200
 201 The comint output is assumed to lie between the marker
 202 `comint-last-output-start' and the process-mark.
 203
 204 This is a good function to put in `comint-output-filter-functions'."
 205   (let ((start-marker (or comint-last-output-start
 206                           (point-min-marker)))
 207         (end-marker (process-mark (get-buffer-process (current-buffer)))))
 208     (cond ((eq ansi-color-for-comint-mode nil))
 209           ((eq ansi-color-for-comint-mode 'filter)
 210            (ansi-color-filter-region start-marker end-marker))
 211           (t
 212            (ansi-color-apply-on-region start-marker end-marker)))))
 213
 214 (add-hook 'comint-output-filter-functions
 215           'ansi-color-process-output)
 216
 217 (defalias 'ansi-color-unfontify-region 'font-lock-default-unfontify-region)
 218 (make-obsolete 'ansi-color-unfontify-region "not needed any more" "24.1")
 219
 220 ;; Working with strings
 221 (defvar ansi-color-context nil
 222   "Context saved between two calls to `ansi-color-apply'.
 223 This is a list of the form (FACES FRAGMENT) or nil.  FACES is a list of
 224 faces the last call to `ansi-color-apply' ended with, and FRAGMENT is a
 225 string starting with an escape sequence, possibly the start of a new
 226 escape sequence.")
 227 (make-variable-buffer-local 'ansi-color-context)
 228
 229 (defun ansi-color-filter-apply (string)
 230   "Filter out all ANSI control sequences from STRING.
 231
 232 Every call to this function will set and use the buffer-local variable
 233 `ansi-color-context' to save partial escape sequences.  This information
 234 will be used for the next call to `ansi-color-apply'.  Set
 235 `ansi-color-context' to nil if you don't want this.
 236
 237 This function can be added to `comint-preoutput-filter-functions'."
 238   (let ((start 0) end result)
 239     ;; if context was saved and is a string, prepend it
 240     (if (cadr ansi-color-context)
 241         (setq string (concat (cadr ansi-color-context) string)
 242               ansi-color-context nil))
 243     ;; find the next escape sequence
 244     (while (setq end (string-match ansi-color-regexp string start))
 245       (setq result (concat result (substring string start end))
 246             start (match-end 0)))
 247     ;; save context, add the remainder of the string to the result
 248     (let (fragment)
 249       (if (string-match "\033" string start)
 250           (let ((pos (match-beginning 0)))
 251             (setq fragment (substring string pos)
 252                   result (concat result (substring string start pos))))
 253         (setq result (concat result (substring string start))))
 254       (setq ansi-color-context (if fragment (list nil fragment))))
 255     result))
 256
 257 (defun ansi-color-apply (string)
 258   "Translates SGR control sequences into text properties.
 259 Delete all other control sequences without processing them.
 260
 261 Applies SGR control sequences setting foreground and background colors
 262 to STRING using text properties and returns the result.  The colors used
 263 are given in `ansi-color-faces-vector' and `ansi-color-names-vector'.
 264 See function `ansi-color-apply-sequence' for details.
 265
 266 Every call to this function will set and use the buffer-local variable
 267 `ansi-color-context' to save partial escape sequences and current face.
 268 This information will be used for the next call to `ansi-color-apply'.
 269 Set `ansi-color-context' to nil if you don't want this.
 270
 271 This function can be added to `comint-preoutput-filter-functions'."
 272   (let ((face (car ansi-color-context))
 273         (start 0) end escape-sequence result
 274         colorized-substring)
 275     ;; If context was saved and is a string, prepend it.
 276     (if (cadr ansi-color-context)
 277         (setq string (concat (cadr ansi-color-context) string)
 278               ansi-color-context nil))
 279     ;; Find the next escape sequence.
 280     (while (setq end (string-match ansi-color-regexp string start))
 281       (setq escape-sequence (match-string 1 string))
 282       ;; Colorize the old block from start to end using old face.
 283       (when face
 284         (put-text-property start end 'font-lock-face face string))
 285       (setq colorized-substring (substring string start end)
 286             start (match-end 0))
 287       ;; Eliminate unrecognized ANSI sequences.
 288       (while (string-match ansi-color-drop-regexp colorized-substring)
 289         (setq colorized-substring
 290               (replace-match "" nil nil colorized-substring)))
 291       (push colorized-substring result)
 292       ;; Create new face, by applying escape sequence parameters.
 293       (setq face (ansi-color-apply-sequence escape-sequence face)))
 294     ;; if the rest of the string should have a face, put it there
 295     (when face
 296       (put-text-property start (length string) 'font-lock-face face string))
 297     ;; save context, add the remainder of the string to the result
 298     (let (fragment)
 299       (if (string-match "\033" string start)
 300           (let ((pos (match-beginning 0)))
 301             (setq fragment (substring string pos))
 302             (push (substring string start pos) result))
 303         (push (substring string start) result))
 304       (setq ansi-color-context (if (or face fragment) (list face fragment))))
 305     (apply 'concat (nreverse result))))
 306
 307 ;; Working with regions
 308
 309 (defvar ansi-color-context-region nil
 310   "Context saved between two calls to `ansi-color-apply-on-region'.
 311 This is a list of the form (FACES MARKER) or nil.  FACES is a list of
 312 faces the last call to `ansi-color-apply-on-region' ended with, and
 313 MARKER is a buffer position within an escape sequence or the last
 314 position processed.")
 315 (make-variable-buffer-local 'ansi-color-context-region)
 316
 317 (defun ansi-color-filter-region (begin end)
 318   "Filter out all ANSI control sequences from region BEGIN to END.
 319
 320 Every call to this function will set and use the buffer-local variable
 321 `ansi-color-context-region' to save position.  This information will be
 322 used for the next call to `ansi-color-apply-on-region'.  Specifically,
 323 it will override BEGIN, the start of the region.  Set
 324 `ansi-color-context-region' to nil if you don't want this."
 325   (let ((end-marker (copy-marker end))
 326         (start (or (cadr ansi-color-context-region) begin)))
 327     (save-excursion
 328       (goto-char start)
 329       ;; Delete unrecognized escape sequences.
 330       (while (re-search-forward ansi-color-drop-regexp end-marker t)
 331         (replace-match ""))
 332       (goto-char start)
 333       ;; Delete SGR escape sequences.
 334       (while (re-search-forward ansi-color-regexp end-marker t)
 335         (replace-match ""))
 336       ;; save context, add the remainder of the string to the result
 337       (if (re-search-forward "\033" end-marker t)
 338           (setq ansi-color-context-region (list nil (match-beginning 0)))
 339         (setq ansi-color-context-region nil)))))
 340
 341 (defun ansi-color-apply-on-region (begin end)
 342   "Translates SGR control sequences into overlays or extents.
 343 Delete all other control sequences without processing them.
 344
 345 SGR control sequences are applied by setting foreground and
 346 background colors to the text between BEGIN and END using
 347 overlays.  The colors used are given in `ansi-color-faces-vector'
 348 and `ansi-color-names-vector'.  See `ansi-color-apply-sequence'
 349 for details.
 350
 351 Every call to this function will set and use the buffer-local variable
 352 `ansi-color-context-region' to save position and current face.  This
 353 information will be used for the next call to
 354 `ansi-color-apply-on-region'.  Specifically, it will override BEGIN, the
 355 start of the region and set the face with which to start.  Set
 356 `ansi-color-context-region' to nil if you don't want this."
 357   (let ((face (car ansi-color-context-region))
 358         (start-marker (or (cadr ansi-color-context-region)
 359                           (copy-marker begin)))
 360         (end-marker (copy-marker end))
 361         escape-sequence)
 362     ;; First, eliminate unrecognized ANSI control sequences.
 363     (save-excursion
 364       (goto-char start-marker)
 365       (while (re-search-forward ansi-color-drop-regexp end-marker t)
 366         (replace-match "")))
 367     (save-excursion
 368       (goto-char start-marker)
 369       ;; Find the next SGR sequence.
 370       (while (re-search-forward ansi-color-regexp end-marker t)
 371         ;; Colorize the old block from start to end using old face.
 372         (when face
 373           (ansi-color-set-extent-face
 374            (ansi-color-make-extent start-marker (match-beginning 0))
 375            face))
 376         ;; store escape sequence and new start position
 377         (setq escape-sequence (match-string 1)
 378               start-marker (copy-marker (match-end 0)))
 379         ;; delete the escape sequence
 380         (replace-match "")
 381         ;; create new face by applying all the parameters in the escape
 382         ;; sequence
 383         (setq face (ansi-color-apply-sequence escape-sequence face)))
 384       ;; search for the possible start of a new escape sequence
 385       (if (re-search-forward "\033" end-marker t)
 386           (progn
 387             ;; if the rest of the region should have a face, put it there
 388             (when face
 389               (ansi-color-set-extent-face
 390                (ansi-color-make-extent start-marker (point))
 391                face))
 392             ;; save face and point
 393             (setq ansi-color-context-region
 394                   (list face (copy-marker (match-beginning 0)))))
 395         ;; if the rest of the region should have a face, put it there
 396         (if face
 397             (progn
 398               (ansi-color-set-extent-face
 399                (ansi-color-make-extent start-marker end-marker)
 400                face)
 401               (setq ansi-color-context-region (list face)))
 402           ;; reset context
 403           (setq ansi-color-context-region nil))))))
 404
 405 ;; This function helps you look for overlapping overlays.  This is
 406 ;; usefull in comint-buffers.  Overlapping overlays should not happen!
 407 ;; A possible cause for bugs are the markers.  If you create an overlay
 408 ;; up to the end of the region, then that end might coincide with the
 409 ;; process-mark.  As text is added BEFORE the process-mark, the overlay
 410 ;; will keep growing.  Therefore, as more overlays are created later on,
 411 ;; there will be TWO OR MORE overlays covering the buffer at that point.
 412 ;; This function helps you check your buffer for these situations.
 413 ; (defun ansi-color-debug-overlays ()
 414 ;   (interactive)
 415 ;   (let ((pos (point-min)))
 416 ;     (while (< pos (point-max))
 417 ;       (if (<= 2 (length (overlays-at pos)))
 418 ;         (progn
 419 ;           (goto-char pos)
 420 ;           (error "%d overlays at %d" (length (overlays-at pos)) pos))
 421 ;       (let (message-log-max)
 422 ;         (message  "Reached %d." pos)))
 423 ;       (setq pos (next-overlay-change pos)))))
 424
 425 ;; Emacs/XEmacs compatibility layer
 426
 427 (defun ansi-color-make-face (property color)
 428   "Return a face with PROPERTY set to COLOR.
 429 PROPERTY can be either symbol `foreground' or symbol `background'.
 430
 431 For Emacs, we just return the cons cell \(PROPERTY . COLOR).
 432 For XEmacs, we create a temporary face and return it."
 433   (if (featurep 'xemacs)
 434       (let ((face (make-face (intern (concat color "-" (symbol-name property)))
 435                              "Temporary face created by ansi-color."
 436                              t)))
 437         (set-face-property face property color)
 438         face)
 439     (cond ((eq property 'foreground)
 440            (cons 'foreground-color color))
 441           ((eq property 'background)
 442            (cons 'background-color color))
 443           (t
 444            (cons property color)))))
 445
 446 (defun ansi-color-make-extent (from to &optional object)
 447   "Make an extent for the range [FROM, TO) in OBJECT.
 448
 449 OBJECT defaults to the current buffer.  XEmacs uses `make-extent', Emacs
 450 uses `make-overlay'.  XEmacs can use a buffer or a string for OBJECT,
 451 Emacs requires OBJECT to be a buffer."
 452   (if (fboundp 'make-extent)
 453       (make-extent from to object)
 454     ;; In Emacs, the overlay might end at the process-mark in comint
 455     ;; buffers.  In that case, new text will be inserted before the
 456     ;; process-mark, ie. inside the overlay (using insert-before-marks).
 457     ;; In order to avoid this, we use the `insert-behind-hooks' overlay
 458     ;; property to make sure it works.
 459     (let ((overlay (make-overlay from to object)))
 460       (overlay-put overlay 'modification-hooks '(ansi-color-freeze-overlay))
 461       overlay)))
 462
 463 (defun ansi-color-freeze-overlay (overlay is-after begin end &optional len)
 464   "Prevent OVERLAY from being extended.
 465 This function can be used for the `modification-hooks' overlay
 466 property."
 467   ;; if stuff was inserted at the end of the overlay
 468   (when (and is-after
 469              (= 0 len)
 470              (= end (overlay-end overlay)))
 471     ;; reset the end of the overlay
 472     (move-overlay overlay (overlay-start overlay) begin)))
 473
 474 (defun ansi-color-set-extent-face (extent face)
 475   "Set the `face' property of EXTENT to FACE.
 476 XEmacs uses `set-extent-face', Emacs  uses `overlay-put'."
 477   (if (featurep 'xemacs)
 478       (set-extent-face extent face)
 479     (overlay-put extent 'face face)))
 480
 481 ;; Helper functions
 482
 483 (defun ansi-color-apply-sequence (escape-sequence faces)
 484   "Apply ESCAPE-SEQ to FACES and return the new list of faces.
 485
 486 ESCAPE-SEQ is an escape sequences parsed by `ansi-color-get-face'.
 487
 488 If the new faces start with the symbol `default', then the new
 489 faces are returned.  If the faces start with something else,
 490 they are appended to the front of the FACES list, and the new
 491 list of faces is returned.
 492
 493 If `ansi-color-get-face' returns nil, then we either got a
 494 null-sequence, or we stumbled upon some garbage.  In either
 495 case we return nil."
 496   (let ((new-faces (ansi-color-get-face escape-sequence)))
 497     (cond ((null new-faces)
 498            nil)
 499           ((eq (car new-faces) 'default)
 500            (cdr new-faces))
 501           (t
 502            ;; Like (append NEW-FACES FACES)
 503            ;; but delete duplicates in FACES.
 504            (let ((modified-faces (copy-sequence faces)))
 505              (dolist (face (nreverse new-faces))
 506                (setq modified-faces (delete face modified-faces))
 507                (push face modified-faces))
 508              modified-faces)))))
 509
 510 (defun ansi-color-make-color-map ()
 511   "Creates a vector of face definitions and returns it.
 512
 513 The index into the vector is an ANSI code.  See the documentation of
 514 `ansi-color-map' for an example.
 515
 516 The face definitions are based upon the variables
 517 `ansi-color-faces-vector' and `ansi-color-names-vector'."
 518   (let ((ansi-color-map (make-vector 50 nil))
 519         (index 0))
 520     ;; miscellaneous attributes
 521     (mapc
 522      (function (lambda (e)
 523                  (aset ansi-color-map index e)
 524                  (setq index (1+ index)) ))
 525      ansi-color-faces-vector)
 526     ;; foreground attributes
 527     (setq index 30)
 528     (mapc
 529      (function (lambda (e)
 530                  (aset ansi-color-map index
 531                        (ansi-color-make-face 'foreground e))
 532                  (setq index (1+ index)) ))
 533      ansi-color-names-vector)
 534     ;; background attributes
 535     (setq index 40)
 536     (mapc
 537      (function (lambda (e)
 538                  (aset ansi-color-map index
 539                        (ansi-color-make-face 'background e))
 540                  (setq index (1+ index)) ))
 541      ansi-color-names-vector)
 542     ansi-color-map))
 543
 544 (defvar ansi-color-map (ansi-color-make-color-map)
 545   "A brand new color map suitable for `ansi-color-get-face'.
 546
 547 The value of this variable is usually constructed by
 548 `ansi-color-make-color-map'.  The values in the array are such that the
 549 numbers included in an SGR control sequences point to the correct
 550 foreground or background colors.
 551
 552 Example: The sequence \033[34m specifies a blue foreground.  Therefore:
 553      (aref ansi-color-map 34)
 554           => \(foreground-color . \"blue\")")
 555
 556 (defun ansi-color-map-update (symbol value)
 557   "Update `ansi-color-map'.
 558
 559 Whenever the vectors used to construct `ansi-color-map' are changed,
 560 this function is called.  Therefore this function is listed as the :set
 561 property of `ansi-color-faces-vector' and `ansi-color-names-vector'."
 562   (set-default symbol value)
 563   (setq ansi-color-map (ansi-color-make-color-map)))
 564
 565 (defun ansi-color-get-face-1 (ansi-code)
 566   "Get face definition from `ansi-color-map'.
 567 ANSI-CODE is used as an index into the vector."
 568   (condition-case nil
 569       (aref ansi-color-map ansi-code)
 570     (args-out-of-range nil)))
 571
 572 (defun ansi-color-get-face (escape-seq)
 573   "Create a new face by applying all the parameters in ESCAPE-SEQ.
 574
 575 Should any of the parameters result in the default face (usually this is
 576 the parameter 0), then the effect of all previous parameters is cancelled.
 577
 578 ESCAPE-SEQ is a SGR control sequences such as \\033[34m.  The parameter
 579 34 is used by `ansi-color-get-face-1' to return a face definition."
 580   (let ((i 0)
 581         f val)
 582     (while (string-match ansi-color-parameter-regexp escape-seq i)
 583       (setq i (match-end 0)
 584             val (ansi-color-get-face-1
 585                  (string-to-number (match-string 1 escape-seq) 10)))
 586       (cond ((not val))
 587             ((eq val 'default)
 588              (setq f (list val)))
 589             (t
 590              (unless (member val f)
 591                (push val f)))))
 592     f))
 593
 594 (provide 'ansi-color)
 595
 596 ;;; ansi-color.el ends here