Mercurial > hg > xemacs-beta
annotate lisp/syntax.el @ 4614:afbfad080ddd
The URLs in our current config.guess and config.sub files are obsolete.
Update to the latest upstream release to get correct URLs, as well as fixes
and enhancements to those scripts.
| author | Jerry James <james@xemacs.org> |
|---|---|
| date | Wed, 11 Feb 2009 11:09:35 -0700 |
| parents | a78d697ccd2c |
| children | fd36a980d701 |
| rev | line source |
|---|---|
| 428 | 1 ;; syntax.el --- Syntax-table hacking stuff, moved from syntax.c |
| 2 | |
| 3 ;; Copyright (C) 1993, 1997 Free Software Foundation, Inc. | |
| 4 ;; Copyright (C) 1995 Sun Microsystems. | |
| 3067 | 5 ;; Copyright (C) 2005 Ben Wing. |
| 428 | 6 |
| 7 ;; This file is part of XEmacs. | |
| 8 | |
| 9 ;; XEmacs is free software; you can redistribute it and/or modify it | |
| 10 ;; under the terms of the GNU General Public License as published by | |
| 11 ;; the Free Software Foundation; either version 2, or (at your option) | |
| 12 ;; any later version. | |
| 13 | |
| 14 ;; XEmacs is distributed in the hope that it will be useful, but | |
| 15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 17 ;; General Public License for more details. | |
| 18 | |
| 19 ;; You should have received a copy of the GNU General Public License | |
| 444 | 20 ;; along with XEmacs; see the file COPYING. If not, write to the |
| 428 | 21 ;; Free Software Foundation, 59 Temple Place - Suite 330, |
| 22 ;; Boston, MA 02111-1307, USA. | |
| 23 | |
| 24 ;;; Synched up with: FSF 19.28. | |
| 25 | |
| 26 ;;; Commentary: | |
| 27 | |
| 28 ;; This file is dumped with XEmacs. | |
| 29 | |
| 30 ;; Note: FSF does not have a file syntax.el. This stuff is | |
| 31 ;; in syntax.c. See comments there about not merging past 19.28. | |
| 32 | |
| 33 ;; Significantly hacked upon by Ben Wing. | |
| 34 | |
| 35 ;;; Code: | |
| 36 | |
| 37 (defun make-syntax-table (&optional oldtable) | |
| 38 "Return a new syntax table. | |
| 39 It inherits all characters from the standard syntax table." | |
| 40 (make-char-table 'syntax)) | |
| 41 | |
|
4468
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
42 (defun syntax-after (pos) |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
43 "Return the raw syntax of the char after POS. |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
44 If POS is outside the buffer's accessible portion, return nil." |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
45 (unless (or (< pos (point-min)) (>= pos (point-max))) |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
46 (let ((st (if lookup-syntax-properties |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
47 (get-char-property pos 'syntax-table)))) |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
48 (char-syntax (char-after pos) (or st (syntax-table)))))) |
|
a78d697ccd2c
Import and extend GNU's descr-text.el, supporting prefix argument for C-x =
Aidan Kehoe <kehoea@parhasard.net>
parents:
3067
diff
changeset
|
49 |
| 428 | 50 (defun simple-set-syntax-entry (char spec table) |
| 51 (put-char-table char spec table)) | |
| 52 | |
| 53 (defun char-syntax-from-code (code) | |
| 54 "Extract the syntax designator from the internal syntax code CODE. | |
| 55 CODE is the value actually contained in the syntax table." | |
| 56 (if (consp code) | |
| 57 (setq code (car code))) | |
| 58 (aref (syntax-designator-chars) (logand code 127))) | |
| 59 | |
| 60 (defun set-char-syntax-in-code (code desig) | |
| 61 "Return a new internal syntax code whose syntax designator is DESIG. | |
| 62 Other characteristics are the same as in CODE." | |
| 63 (let ((newcode (if (consp code) (car code) code))) | |
| 64 (setq newcode (logior (string-match | |
| 65 (regexp-quote (char-to-string desig)) | |
| 66 (syntax-designator-chars)) | |
| 67 (logand newcode (lognot 127)))) | |
| 68 (if (consp code) (cons newcode (cdr code)) | |
| 69 newcode))) | |
| 70 | |
| 71 (defun syntax-code-to-string (code) | |
| 72 "Return a string equivalent to internal syntax code CODE. | |
| 73 The string can be passed to `modify-syntax-entry'. | |
| 74 If CODE is invalid, return nil." | |
| 75 (let ((match (and (consp code) (cdr code))) | |
| 76 (codes (syntax-designator-chars))) | |
| 77 (if (consp code) | |
| 78 (setq code (car code))) | |
| 79 (if (or (not (integerp code)) | |
| 80 (> (logand code 127) (length codes))) | |
| 81 nil | |
| 82 (with-output-to-string | |
| 83 (let* ((spec (elt codes (logand code 127))) | |
| 84 (b3 (lsh code -16)) | |
| 85 (start1 (/= 0 (logand b3 128))) ;logtest! | |
| 86 (start1b (/= 0 (logand b3 64))) | |
| 87 (start2 (/= 0 (logand b3 32))) | |
| 88 (start2b (/= 0 (logand b3 16))) | |
| 89 (end1 (/= 0 (logand b3 8))) | |
| 90 (end1b (/= 0 (logand b3 4))) | |
| 91 (end2 (/= 0 (logand b3 2))) | |
| 92 (end2b (/= 0 (logand b3 1))) | |
| 93 (prefix (/= 0 (logand code 128))) | |
| 94 (single-char-p (or (= spec ?<) (= spec ?>))) | |
| 95 ) | |
| 96 (write-char spec) | |
| 97 (write-char (if match match 32)) | |
| 98 ;;; (if start1 (if single-char-p (write-char ?a) (write-char ?1))) | |
| 99 (if start1 (if single-char-p (write-char ? ) (write-char ?1))) | |
| 100 (if start2 (write-char ?2)) | |
| 101 ;;; (if end1 (if single-char-p (write-char ?a) (write-char ?3))) | |
| 102 (if end1 (if single-char-p (write-char ? ) (write-char ?3))) | |
| 103 (if end2 (write-char ?4)) | |
| 104 (if start1b (if single-char-p (write-char ?b) (write-char ?5))) | |
| 105 (if start2b (write-char ?6)) | |
| 106 (if end1b (if single-char-p (write-char ?b) (write-char ?7))) | |
| 107 (if end2b (write-char ?8)) | |
| 108 (if prefix (write-char ?p))))))) | |
| 109 | |
| 110 (defun syntax-string-to-code (string) | |
| 111 "Return the internal syntax code equivalent to STRING. | |
| 112 STRING should be something acceptable as the second argument to | |
| 113 `modify-syntax-entry'. | |
| 114 If STRING is invalid, signal an error." | |
| 115 (let* ((bflag nil) | |
| 116 (b3 0) | |
| 117 (ch0 (aref string 0)) | |
| 118 (len (length string)) | |
| 119 (code (string-match (regexp-quote (char-to-string ch0)) | |
| 120 (syntax-designator-chars))) | |
| 121 (i 2) | |
| 122 ch) | |
| 123 (or code | |
| 124 (error "Invalid syntax designator: %S" string)) | |
| 125 (while (< i len) | |
| 126 (setq ch (aref string i)) | |
| 127 (incf i) | |
| 128 (case ch | |
| 129 (?1 (setq b3 (logior b3 128))) | |
| 130 (?2 (setq b3 (logior b3 32))) | |
| 131 (?3 (setq b3 (logior b3 8))) | |
| 132 (?4 (setq b3 (logior b3 2))) | |
| 133 (?5 (setq b3 (logior b3 64))) | |
| 134 (?6 (setq b3 (logior b3 16))) | |
| 135 (?7 (setq b3 (logior b3 4))) | |
| 136 (?8 (setq b3 (logior b3 1))) | |
| 137 (?a (case ch0 | |
| 138 (?< (setq b3 (logior b3 128))) | |
| 139 (?> (setq b3 (logior b3 8))))) | |
| 140 (?b (case ch0 | |
| 141 (?< (setq b3 (logior b3 64) bflag t)) | |
| 142 (?> (setq b3 (logior b3 4) bflag t)))) | |
| 143 (?p (setq code (logior code (lsh 1 7)))) | |
| 144 (?\ nil) ;; ignore for compatibility | |
| 145 (otherwise | |
| 146 (error "Invalid syntax description flag: %S" string)))) | |
| 147 ;; default single char style if `b' has not been seen | |
| 148 (if (not bflag) | |
| 149 (case ch0 | |
| 150 (?< (setq b3 (logior b3 128))) | |
| 151 (?> (setq b3 (logior b3 8))))) | |
| 152 (setq code (logior code (lsh b3 16))) | |
| 153 (if (and (> len 1) | |
| 154 ;; tough luck if you want to make space a paren! | |
| 155 (/= (aref string 1) ?\ )) | |
| 156 (setq code (cons code (aref string 1)))) | |
| 157 code)) | |
| 158 | |
| 444 | 159 (defun modify-syntax-entry (char-range spec &optional syntax-table) |
| 428 | 160 "Set syntax for the characters CHAR-RANGE according to string SPEC. |
| 161 CHAR-RANGE is a single character or a range of characters, | |
| 162 as per `put-char-table'. | |
| 444 | 163 The syntax is changed only for SYNTAX-TABLE, which defaults to |
| 428 | 164 the current buffer's syntax table. |
| 165 The first character of SPEC should be one of the following: | |
| 166 Space whitespace syntax. w word constituent. | |
| 167 _ symbol constituent. . punctuation. | |
| 168 \( open-parenthesis. \) close-parenthesis. | |
| 169 \" string quote. \\ character-quote. | |
| 170 $ paired delimiter. ' expression quote or prefix operator. | |
| 171 < comment starter. > comment ender. | |
| 172 / character-quote. @ inherit from `standard-syntax-table'. | |
| 173 | |
| 174 Only single-character comment start and end sequences are represented thus. | |
| 175 Two-character sequences are represented as described below. | |
| 176 The second character of SPEC is the matching parenthesis, | |
| 177 used only if the first character is `(' or `)'. | |
| 178 Any additional characters are flags. | |
| 179 Defined flags are the characters 1, 2, 3, 4, 5, 6, 7, 8, p, a, and b. | |
| 180 1 means C is the first of a two-char comment start sequence of style a. | |
| 181 2 means C is the second character of such a sequence. | |
| 182 3 means C is the first of a two-char comment end sequence of style a. | |
| 183 4 means C is the second character of such a sequence. | |
| 184 5 means C is the first of a two-char comment start sequence of style b. | |
| 185 6 means C is the second character of such a sequence. | |
| 186 7 means C is the first of a two-char comment end sequence of style b. | |
| 187 8 means C is the second character of such a sequence. | |
| 188 p means C is a prefix character for `backward-prefix-chars'; | |
| 189 such characters are treated as whitespace when they occur | |
| 190 between expressions. | |
| 191 a means C is comment starter or comment ender for comment style a (default) | |
| 192 b means C is comment starter or comment ender for comment style b." | |
| 444 | 193 (interactive |
| 428 | 194 ;; I really don't know why this is interactive |
| 195 ;; help-form should at least be made useful while reading the second arg | |
| 196 "cSet syntax for character: \nsSet syntax for %c to: ") | |
| 444 | 197 (simple-set-syntax-entry |
| 198 char-range | |
| 199 (syntax-string-to-code spec) | |
| 200 (cond ((syntax-table-p syntax-table) | |
| 201 syntax-table) | |
| 202 ((null syntax-table) | |
| 203 (syntax-table)) | |
| 204 (t | |
| 205 (wrong-type-argument 'syntax-table-p syntax-table)))) | |
| 428 | 206 nil) |
| 207 | |
| 444 | 208 (defun map-syntax-table (__function __syntax_table &optional __range) |
| 209 "Map FUNCTION over entries in SYNTAX-TABLE, collapsing inheritance. | |
| 428 | 210 This is similar to `map-char-table', but works only on syntax tables, and |
| 211 collapses any entries that call for inheritance by invisibly substituting | |
| 212 the inherited values from the standard syntax table." | |
| 444 | 213 (check-argument-type 'syntax-table-p __syntax_table) |
| 428 | 214 (map-char-table #'(lambda (__key __value) |
| 215 (if (eq ?@ (char-syntax-from-code __value)) | |
| 216 (map-char-table #'(lambda (__key __value) | |
| 217 (funcall __function | |
| 218 __key __value)) | |
| 219 (standard-syntax-table) | |
| 220 __key) | |
| 221 (funcall __function __key __value))) | |
| 444 | 222 __syntax_table __range)) |
| 428 | 223 |
| 224 ;(defun test-xm () | |
| 225 ; (let ((o (copy-syntax-table)) | |
| 226 ; (n (copy-syntax-table)) | |
| 227 ; (codes (syntax-designator-chars)) | |
| 228 ; (flags "12345678abp")) | |
| 229 ; (while t | |
| 230 ; (let ((spec (concat (char-to-string (elt codes | |
| 231 ; (random (length codes)))))) | |
| 232 ; (if (= (random 4) 0) | |
| 233 ; "b" | |
| 234 ; " ") | |
| 235 ; (let* ((n (random 4)) | |
| 236 ; (s (make-string n 0))) | |
| 237 ; (while (> n 0) | |
| 238 ; (setq n (1- n)) | |
| 239 ; (aset s n (aref flags (random (length flags))))) | |
| 240 ; s)))) | |
| 241 ; (message "%S..." spec) | |
| 242 ; (modify-syntax-entry ?a spec o) | |
| 243 ; (xmodify-syntax-entry ?a spec n) | |
| 244 ; (or (= (aref o ?a) (aref n ?a)) | |
| 245 ; (error "%s" | |
| 246 ; (format "fucked with %S: %x %x" | |
| 247 ; spec (aref o ?a) (aref n ?a)))))))) | |
| 248 | |
| 249 | |
| 3067 | 250 (defun describe-char-table (table mapper describe-value stream) |
| 251 "Describe char-table TABLE, outputting to STREAM. | |
| 252 MAPPER maps over the table and should be `map-char-table' or | |
| 253 `map-syntax-table'. DESCRIBE-VALUE is a function of two arguments, | |
| 254 VALUE and STREAM, and should output a description of VALUE." | |
| 428 | 255 (let (first-char |
| 256 last-char | |
| 257 prev-val | |
| 258 (describe-one | |
| 259 (if (featurep 'mule) | |
| 260 #'(lambda (first last value stream) | |
| 261 (if (equal first last) | |
| 262 (cond ((vectorp first) | |
| 263 (princ (format "%s, row %d\t" | |
| 502 | 264 (declare-fboundp (charset-name |
| 265 (aref first 0))) | |
| 428 | 266 (aref first 1)) |
| 267 stream)) | |
| 268 ((symbolp first) | |
| 269 (princ first stream) | |
| 270 (princ "\t" stream)) | |
| 271 (t | |
| 272 (princ (text-char-description first) stream) | |
| 273 (princ "\t" stream))) | |
| 274 (cond ((vectorp first) | |
| 275 (princ (format "%s, rows %d .. %d\t" | |
| 502 | 276 (declare-fboundp (charset-name |
| 277 (aref first 0))) | |
| 428 | 278 (aref first 1) |
| 279 (aref last 1)) | |
| 280 stream)) | |
| 281 ((symbolp first) | |
| 282 (princ (format "%s .. %s\t" first last) stream)) | |
| 283 (t | |
| 284 (princ (format "%s .. %s\t" | |
| 285 (text-char-description first) | |
| 286 (text-char-description last)) | |
| 287 stream)))) | |
| 3067 | 288 (funcall describe-value value stream)) |
| 428 | 289 #'(lambda (first last value stream) |
| 290 (let* ((tem (text-char-description first)) | |
| 291 (pos (length tem)) | |
| 292 ;;(limit (cond ((numberp ctl-arrow) ctl-arrow) | |
| 293 ;; ((memq ctl-arrow '(t nil)) 256) | |
| 294 ;; (t 160))) | |
| 295 ) | |
| 296 (princ tem stream) | |
| 297 (if (> last first) | |
| 298 (progn | |
| 299 (princ " .. " stream) | |
| 300 (setq tem (text-char-description last)) | |
| 301 (princ tem stream) | |
| 302 (setq pos (+ pos (length tem) 4)))) | |
| 303 (while (progn (write-char ?\ stream) | |
| 304 (setq pos (1+ pos)) | |
| 305 (< pos 16)))) | |
| 3067 | 306 (funcall describe-value value stream))))) |
| 307 (funcall mapper | |
| 428 | 308 #'(lambda (range value) |
| 309 (cond | |
| 310 ((not first-char) | |
| 311 (setq first-char range | |
| 312 last-char range | |
| 313 prev-val value)) | |
| 314 ((and (equal value prev-val) | |
| 315 (or | |
| 316 (and (characterp range) | |
| 317 (characterp first-char) | |
| 318 (or (not (featurep 'mule)) | |
| 502 | 319 (eq (declare-fboundp (char-charset range)) |
| 320 (declare-fboundp (char-charset first-char)))) | |
| 428 | 321 (= (char-int last-char) (1- (char-int range)))) |
| 322 (and (vectorp range) | |
| 323 (vectorp first-char) | |
| 324 (eq (aref range 0) (aref first-char 0)) | |
| 325 (= (aref last-char 1) (1- (aref range 1)))))) | |
| 326 (setq last-char range)) | |
| 327 (t | |
| 328 (funcall describe-one first-char last-char prev-val stream) | |
| 329 (setq first-char range | |
| 330 last-char range | |
| 331 prev-val value))) | |
| 332 nil) | |
| 333 table) | |
| 334 (if first-char | |
| 335 (funcall describe-one first-char last-char prev-val stream)))) | |
| 336 | |
| 3067 | 337 (defun describe-syntax-table (table stream) |
| 338 "Output a description of TABLE (a syntax table) to STREAM." | |
| 339 (describe-char-table table 'map-syntax-table 'describe-syntax-code stream)) | |
| 340 | |
| 428 | 341 (defun describe-syntax-code (code stream) |
| 342 (let ((match (and (consp code) (cdr code))) | |
| 343 (invalid (gettext "**invalid**")) ;(empty "") ;constants | |
| 344 (standard-output (or stream standard-output)) | |
| 345 ;; #### I18N3 should temporarily set buffer to output-translatable | |
| 346 (in #'(lambda (string) | |
| 347 (princ ",\n\t\t\t\t ") | |
| 348 (princ string))) | |
| 349 (syntax-string (syntax-code-to-string code))) | |
| 350 (if (consp code) | |
| 351 (setq code (car code))) | |
| 352 (if (null syntax-string) | |
| 353 (princ invalid) | |
| 354 (princ syntax-string) | |
| 355 (princ "\tmeaning: ") | |
| 356 (princ (aref ["whitespace" "punctuation" "word-constituent" | |
| 357 "symbol-constituent" "open-paren" "close-paren" | |
| 358 "expression-prefix" "string-quote" "paired-delimiter" | |
| 359 "escape" "character-quote" "comment-begin" "comment-end" | |
| 360 "inherit" "extended-word-constituent"] | |
| 361 (logand code 127))) | |
| 362 | |
| 363 (if match | |
| 364 (progn | |
| 365 (princ ", matches ") | |
| 366 (princ (text-char-description match)))) | |
| 367 (let* ((spec (elt syntax-string 0)) | |
| 368 (b3 (lsh code -16)) | |
| 369 (start1 (/= 0 (logand b3 128))) ;logtest! | |
| 370 (start1b (/= 0 (logand b3 64))) | |
| 371 (start2 (/= 0 (logand b3 32))) | |
| 372 (start2b (/= 0 (logand b3 16))) | |
| 373 (end1 (/= 0 (logand b3 8))) | |
| 374 (end1b (/= 0 (logand b3 4))) | |
| 375 (end2 (/= 0 (logand b3 2))) | |
| 376 (end2b (/= 0 (logand b3 1))) | |
| 377 (prefix (/= 0 (logand code 128))) | |
| 378 (single-char-p (or (= spec ?<) (= spec ?>)))) | |
| 379 (if start1 | |
| 380 (if single-char-p | |
| 381 (princ ", style A") | |
| 382 (funcall in | |
| 383 (gettext "first character of comment-start sequence A")))) | |
| 384 (if start2 | |
| 385 (funcall in | |
| 386 (gettext "second character of comment-start sequence A"))) | |
| 387 (if end1 | |
| 388 (if single-char-p | |
| 389 (princ ", style A") | |
| 390 (funcall in | |
| 391 (gettext "first character of comment-end sequence A")))) | |
| 392 (if end2 | |
| 393 (funcall in | |
| 394 (gettext "second character of comment-end sequence A"))) | |
| 395 (if start1b | |
| 396 (if single-char-p | |
| 397 (princ ", style B") | |
| 398 (funcall in | |
| 399 (gettext "first character of comment-start sequence B")))) | |
| 400 (if start2b | |
| 401 (funcall in | |
| 402 (gettext "second character of comment-start sequence B"))) | |
| 403 (if end1b | |
| 404 (if single-char-p | |
| 405 (princ ", style B") | |
| 406 (funcall in | |
| 407 (gettext "first character of comment-end sequence B")))) | |
| 408 (if end2b | |
| 409 (funcall in | |
| 410 (gettext "second character of comment-end sequence B"))) | |
| 411 (if prefix | |
| 412 (funcall in | |
| 413 (gettext "prefix character for `backward-prefix-chars'")))) | |
| 414 (terpri stream)))) | |
| 415 | |
| 416 (defun symbol-near-point () | |
| 417 "Return the first textual item to the nearest point." | |
| 418 (interactive) | |
| 419 ;alg stolen from etag.el | |
| 420 (save-excursion | |
| 421 (if (or (bobp) (not (memq (char-syntax (char-before)) '(?w ?_)))) | |
| 422 (while (not (looking-at "\\sw\\|\\s_\\|\\'")) | |
| 423 (forward-char 1))) | |
| 424 (while (looking-at "\\sw\\|\\s_") | |
| 425 (forward-char 1)) | |
| 426 (if (re-search-backward "\\sw\\|\\s_" nil t) | |
| 427 (regexp-quote | |
| 428 (progn (forward-char 1) | |
| 429 (buffer-substring (point) | |
| 430 (progn (forward-sexp -1) | |
| 431 (while (looking-at "\\s'") | |
| 432 (forward-char 1)) | |
| 433 (point))))) | |
| 434 nil))) | |
| 435 | |
| 436 ;;; syntax.el ends here |