| 1 | /* GNU Emacs routines to deal with syntax tables; also word and list parsing. |
| 2 | Copyright (C) 1985, 1987, 1993-1995, 1997-1999, 2001-2014 Free |
| 3 | Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Emacs. |
| 6 | |
| 7 | GNU Emacs is free software: you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | GNU Emacs is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */ |
| 19 | |
| 20 | |
| 21 | #include <config.h> |
| 22 | |
| 23 | #include <sys/types.h> |
| 24 | |
| 25 | #include "lisp.h" |
| 26 | #include "commands.h" |
| 27 | #include "character.h" |
| 28 | #include "buffer.h" |
| 29 | #include "keymap.h" |
| 30 | #include "regex.h" |
| 31 | |
| 32 | #include "syntax.h" |
| 33 | #include "intervals.h" |
| 34 | #include "category.h" |
| 35 | |
| 36 | /* Make syntax table lookup grant data in gl_state. */ |
| 37 | #define SYNTAX(c) syntax_property (c, 1) |
| 38 | #define SYNTAX_ENTRY(c) syntax_property_entry (c, 1) |
| 39 | #define SYNTAX_WITH_FLAGS(c) syntax_property_with_flags (c, 1) |
| 40 | |
| 41 | /* Eight single-bit flags have the following meanings: |
| 42 | 1. This character is the first of a two-character comment-start sequence. |
| 43 | 2. This character is the second of a two-character comment-start sequence. |
| 44 | 3. This character is the first of a two-character comment-end sequence. |
| 45 | 4. This character is the second of a two-character comment-end sequence. |
| 46 | 5. This character is a prefix, for backward-prefix-chars. |
| 47 | 6. The char is part of a delimiter for comments of style "b". |
| 48 | 7. This character is part of a nestable comment sequence. |
| 49 | 8. The char is part of a delimiter for comments of style "c". |
| 50 | Note that any two-character sequence whose first character has flag 1 |
| 51 | and whose second character has flag 2 will be interpreted as a comment start. |
| 52 | |
| 53 | Bits 6 and 8 discriminate among different comment styles. |
| 54 | Languages such as C++ allow two orthogonal syntax start/end pairs |
| 55 | and bit 6 determines whether a comment-end or Scommentend |
| 56 | ends style a or b. Comment markers can start style a, b, c, or bc. |
| 57 | Style a is always the default. |
| 58 | For 2-char comment markers, the style b flag is looked up only on the second |
| 59 | char of the comment marker and on the first char of the comment ender. |
| 60 | For style c (like the nested flag), the flag can be placed on any of |
| 61 | the chars. */ |
| 62 | |
| 63 | /* These functions extract specific flags from an integer |
| 64 | that holds the syntax code and the flags. */ |
| 65 | |
| 66 | static bool |
| 67 | SYNTAX_FLAGS_COMSTART_FIRST (int flags) |
| 68 | { |
| 69 | return (flags >> 16) & 1; |
| 70 | } |
| 71 | static bool |
| 72 | SYNTAX_FLAGS_COMSTART_SECOND (int flags) |
| 73 | { |
| 74 | return (flags >> 17) & 1; |
| 75 | } |
| 76 | static bool |
| 77 | SYNTAX_FLAGS_COMEND_FIRST (int flags) |
| 78 | { |
| 79 | return (flags >> 18) & 1; |
| 80 | } |
| 81 | static bool |
| 82 | SYNTAX_FLAGS_COMEND_SECOND (int flags) |
| 83 | { |
| 84 | return (flags >> 19) & 1; |
| 85 | } |
| 86 | static bool |
| 87 | SYNTAX_FLAGS_PREFIX (int flags) |
| 88 | { |
| 89 | return (flags >> 20) & 1; |
| 90 | } |
| 91 | static bool |
| 92 | SYNTAX_FLAGS_COMMENT_STYLEB (int flags) |
| 93 | { |
| 94 | return (flags >> 21) & 1; |
| 95 | } |
| 96 | static bool |
| 97 | SYNTAX_FLAGS_COMMENT_STYLEC (int flags) |
| 98 | { |
| 99 | return (flags >> 23) & 1; |
| 100 | } |
| 101 | static int |
| 102 | SYNTAX_FLAGS_COMMENT_STYLEC2 (int flags) |
| 103 | { |
| 104 | return (flags >> 22) & 2; /* SYNTAX_FLAGS_COMMENT_STYLEC (flags) * 2 */ |
| 105 | } |
| 106 | static bool |
| 107 | SYNTAX_FLAGS_COMMENT_NESTED (int flags) |
| 108 | { |
| 109 | return (flags >> 22) & 1; |
| 110 | } |
| 111 | |
| 112 | /* FLAGS should be the flags of the main char of the comment marker, e.g. |
| 113 | the second for comstart and the first for comend. */ |
| 114 | static int |
| 115 | SYNTAX_FLAGS_COMMENT_STYLE (int flags, int other_flags) |
| 116 | { |
| 117 | return (SYNTAX_FLAGS_COMMENT_STYLEB (flags) |
| 118 | | SYNTAX_FLAGS_COMMENT_STYLEC2 (flags) |
| 119 | | SYNTAX_FLAGS_COMMENT_STYLEC2 (other_flags)); |
| 120 | } |
| 121 | |
| 122 | /* Extract a particular flag for a given character. */ |
| 123 | |
| 124 | static bool |
| 125 | SYNTAX_COMEND_FIRST (int c) |
| 126 | { |
| 127 | return SYNTAX_FLAGS_COMEND_FIRST (SYNTAX_WITH_FLAGS (c)); |
| 128 | } |
| 129 | |
| 130 | /* We use these constants in place for comment-style and |
| 131 | string-ender-char to distinguish comments/strings started by |
| 132 | comment_fence and string_fence codes. */ |
| 133 | |
| 134 | enum |
| 135 | { |
| 136 | ST_COMMENT_STYLE = 256 + 1, |
| 137 | ST_STRING_STYLE = 256 + 2 |
| 138 | }; |
| 139 | |
| 140 | static Lisp_Object Qsyntax_table_p; |
| 141 | static Lisp_Object Qsyntax_table, Qscan_error; |
| 142 | |
| 143 | /* This is the internal form of the parse state used in parse-partial-sexp. */ |
| 144 | |
| 145 | struct lisp_parse_state |
| 146 | { |
| 147 | EMACS_INT depth; /* Depth at end of parsing. */ |
| 148 | int instring; /* -1 if not within string, else desired terminator. */ |
| 149 | EMACS_INT incomment; /* -1 if in unnestable comment else comment nesting */ |
| 150 | int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE. */ |
| 151 | bool quoted; /* True if just after an escape char at end of parsing. */ |
| 152 | EMACS_INT mindepth; /* Minimum depth seen while scanning. */ |
| 153 | /* Char number of most recent start-of-expression at current level */ |
| 154 | ptrdiff_t thislevelstart; |
| 155 | /* Char number of start of containing expression */ |
| 156 | ptrdiff_t prevlevelstart; |
| 157 | ptrdiff_t location; /* Char number at which parsing stopped. */ |
| 158 | ptrdiff_t location_byte; /* Corresponding byte position. */ |
| 159 | ptrdiff_t comstr_start; /* Position of last comment/string starter. */ |
| 160 | Lisp_Object levelstarts; /* Char numbers of starts-of-expression |
| 161 | of levels (starting from outermost). */ |
| 162 | }; |
| 163 | \f |
| 164 | /* These variables are a cache for finding the start of a defun. |
| 165 | find_start_pos is the place for which the defun start was found. |
| 166 | find_start_value is the defun start position found for it. |
| 167 | find_start_value_byte is the corresponding byte position. |
| 168 | find_start_buffer is the buffer it was found in. |
| 169 | find_start_begv is the BEGV value when it was found. |
| 170 | find_start_modiff is the value of MODIFF when it was found. */ |
| 171 | |
| 172 | static ptrdiff_t find_start_pos; |
| 173 | static ptrdiff_t find_start_value; |
| 174 | static ptrdiff_t find_start_value_byte; |
| 175 | static struct buffer *find_start_buffer; |
| 176 | static ptrdiff_t find_start_begv; |
| 177 | static EMACS_INT find_start_modiff; |
| 178 | |
| 179 | |
| 180 | static Lisp_Object skip_chars (bool, Lisp_Object, Lisp_Object, bool); |
| 181 | static Lisp_Object skip_syntaxes (bool, Lisp_Object, Lisp_Object); |
| 182 | static Lisp_Object scan_lists (EMACS_INT, EMACS_INT, EMACS_INT, bool); |
| 183 | static void scan_sexps_forward (struct lisp_parse_state *, |
| 184 | ptrdiff_t, ptrdiff_t, ptrdiff_t, EMACS_INT, |
| 185 | bool, Lisp_Object, int); |
| 186 | static bool in_classes (int, Lisp_Object); |
| 187 | |
| 188 | /* This setter is used only in this file, so it can be private. */ |
| 189 | static void |
| 190 | bset_syntax_table (struct buffer *b, Lisp_Object val) |
| 191 | { |
| 192 | b->INTERNAL_FIELD (syntax_table) = val; |
| 193 | } |
| 194 | \f |
| 195 | /* Whether the syntax of the character C has the prefix flag set. */ |
| 196 | bool |
| 197 | syntax_prefix_flag_p (int c) |
| 198 | { |
| 199 | return SYNTAX_FLAGS_PREFIX (SYNTAX_WITH_FLAGS (c)); |
| 200 | } |
| 201 | |
| 202 | struct gl_state_s gl_state; /* Global state of syntax parser. */ |
| 203 | |
| 204 | enum { INTERVALS_AT_ONCE = 10 }; /* 1 + max-number of intervals |
| 205 | to scan to property-change. */ |
| 206 | |
| 207 | /* Set the syntax entry VAL for char C in table TABLE. */ |
| 208 | |
| 209 | static void |
| 210 | SET_RAW_SYNTAX_ENTRY (Lisp_Object table, int c, Lisp_Object val) |
| 211 | { |
| 212 | CHAR_TABLE_SET (table, c, val); |
| 213 | } |
| 214 | |
| 215 | /* Set the syntax entry VAL for char-range RANGE in table TABLE. |
| 216 | RANGE is a cons (FROM . TO) specifying the range of characters. */ |
| 217 | |
| 218 | static void |
| 219 | SET_RAW_SYNTAX_ENTRY_RANGE (Lisp_Object table, Lisp_Object range, |
| 220 | Lisp_Object val) |
| 221 | { |
| 222 | Fset_char_table_range (table, range, val); |
| 223 | } |
| 224 | |
| 225 | /* Extract the information from the entry for character C |
| 226 | in the current syntax table. */ |
| 227 | |
| 228 | static Lisp_Object |
| 229 | SYNTAX_MATCH (int c) |
| 230 | { |
| 231 | Lisp_Object ent = SYNTAX_ENTRY (c); |
| 232 | return CONSP (ent) ? XCDR (ent) : Qnil; |
| 233 | } |
| 234 | |
| 235 | /* This should be called with FROM at the start of forward |
| 236 | search, or after the last position of the backward search. It |
| 237 | makes sure that the first char is picked up with correct table, so |
| 238 | one does not need to call UPDATE_SYNTAX_TABLE immediately after the |
| 239 | call. |
| 240 | Sign of COUNT gives the direction of the search. |
| 241 | */ |
| 242 | |
| 243 | static void |
| 244 | SETUP_SYNTAX_TABLE (ptrdiff_t from, ptrdiff_t count) |
| 245 | { |
| 246 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 247 | gl_state.b_property = BEGV; |
| 248 | gl_state.e_property = ZV + 1; |
| 249 | gl_state.object = Qnil; |
| 250 | gl_state.offset = 0; |
| 251 | if (parse_sexp_lookup_properties) |
| 252 | if (count > 0 || from > BEGV) |
| 253 | update_syntax_table (count > 0 ? from : from - 1, count, 1, Qnil); |
| 254 | } |
| 255 | |
| 256 | /* Same as above, but in OBJECT. If OBJECT is nil, use current buffer. |
| 257 | If it is t (which is only used in fast_c_string_match_ignore_case), |
| 258 | ignore properties altogether. |
| 259 | |
| 260 | This is meant for regex.c to use. For buffers, regex.c passes arguments |
| 261 | to the UPDATE_SYNTAX_TABLE functions which are relative to BEGV. |
| 262 | So if it is a buffer, we set the offset field to BEGV. */ |
| 263 | |
| 264 | void |
| 265 | SETUP_SYNTAX_TABLE_FOR_OBJECT (Lisp_Object object, |
| 266 | ptrdiff_t from, ptrdiff_t count) |
| 267 | { |
| 268 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 269 | gl_state.object = object; |
| 270 | if (BUFFERP (gl_state.object)) |
| 271 | { |
| 272 | struct buffer *buf = XBUFFER (gl_state.object); |
| 273 | gl_state.b_property = 1; |
| 274 | gl_state.e_property = BUF_ZV (buf) - BUF_BEGV (buf) + 1; |
| 275 | gl_state.offset = BUF_BEGV (buf) - 1; |
| 276 | } |
| 277 | else if (NILP (gl_state.object)) |
| 278 | { |
| 279 | gl_state.b_property = 1; |
| 280 | gl_state.e_property = ZV - BEGV + 1; |
| 281 | gl_state.offset = BEGV - 1; |
| 282 | } |
| 283 | else if (EQ (gl_state.object, Qt)) |
| 284 | { |
| 285 | gl_state.b_property = 0; |
| 286 | gl_state.e_property = PTRDIFF_MAX; |
| 287 | gl_state.offset = 0; |
| 288 | } |
| 289 | else |
| 290 | { |
| 291 | gl_state.b_property = 0; |
| 292 | gl_state.e_property = 1 + SCHARS (gl_state.object); |
| 293 | gl_state.offset = 0; |
| 294 | } |
| 295 | if (parse_sexp_lookup_properties) |
| 296 | update_syntax_table (from + gl_state.offset - (count <= 0), |
| 297 | count, 1, gl_state.object); |
| 298 | } |
| 299 | |
| 300 | /* Update gl_state to an appropriate interval which contains CHARPOS. The |
| 301 | sign of COUNT give the relative position of CHARPOS wrt the previously |
| 302 | valid interval. If INIT, only [be]_property fields of gl_state are |
| 303 | valid at start, the rest is filled basing on OBJECT. |
| 304 | |
| 305 | `gl_state.*_i' are the intervals, and CHARPOS is further in the search |
| 306 | direction than the intervals - or in an interval. We update the |
| 307 | current syntax-table basing on the property of this interval, and |
| 308 | update the interval to start further than CHARPOS - or be |
| 309 | NULL. We also update lim_property to be the next value of |
| 310 | charpos to call this subroutine again - or be before/after the |
| 311 | start/end of OBJECT. */ |
| 312 | |
| 313 | void |
| 314 | update_syntax_table (ptrdiff_t charpos, EMACS_INT count, bool init, |
| 315 | Lisp_Object object) |
| 316 | { |
| 317 | Lisp_Object tmp_table; |
| 318 | int cnt = 0; |
| 319 | bool invalidate = 1; |
| 320 | INTERVAL i; |
| 321 | |
| 322 | if (init) |
| 323 | { |
| 324 | gl_state.old_prop = Qnil; |
| 325 | gl_state.start = gl_state.b_property; |
| 326 | gl_state.stop = gl_state.e_property; |
| 327 | i = interval_of (charpos, object); |
| 328 | gl_state.backward_i = gl_state.forward_i = i; |
| 329 | invalidate = 0; |
| 330 | if (!i) |
| 331 | return; |
| 332 | /* interval_of updates only ->position of the return value, so |
| 333 | update the parents manually to speed up update_interval. */ |
| 334 | while (!NULL_PARENT (i)) |
| 335 | { |
| 336 | if (AM_RIGHT_CHILD (i)) |
| 337 | INTERVAL_PARENT (i)->position = i->position |
| 338 | - LEFT_TOTAL_LENGTH (i) + TOTAL_LENGTH (i) /* right end */ |
| 339 | - TOTAL_LENGTH (INTERVAL_PARENT (i)) |
| 340 | + LEFT_TOTAL_LENGTH (INTERVAL_PARENT (i)); |
| 341 | else |
| 342 | INTERVAL_PARENT (i)->position = i->position - LEFT_TOTAL_LENGTH (i) |
| 343 | + TOTAL_LENGTH (i); |
| 344 | i = INTERVAL_PARENT (i); |
| 345 | } |
| 346 | i = gl_state.forward_i; |
| 347 | gl_state.b_property = i->position - gl_state.offset; |
| 348 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
| 349 | goto update; |
| 350 | } |
| 351 | i = count > 0 ? gl_state.forward_i : gl_state.backward_i; |
| 352 | |
| 353 | /* We are guaranteed to be called with CHARPOS either in i, |
| 354 | or further off. */ |
| 355 | if (!i) |
| 356 | error ("Error in syntax_table logic for to-the-end intervals"); |
| 357 | else if (charpos < i->position) /* Move left. */ |
| 358 | { |
| 359 | if (count > 0) |
| 360 | error ("Error in syntax_table logic for intervals <-"); |
| 361 | /* Update the interval. */ |
| 362 | i = update_interval (i, charpos); |
| 363 | if (INTERVAL_LAST_POS (i) != gl_state.b_property) |
| 364 | { |
| 365 | invalidate = 0; |
| 366 | gl_state.forward_i = i; |
| 367 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
| 368 | } |
| 369 | } |
| 370 | else if (charpos >= INTERVAL_LAST_POS (i)) /* Move right. */ |
| 371 | { |
| 372 | if (count < 0) |
| 373 | error ("Error in syntax_table logic for intervals ->"); |
| 374 | /* Update the interval. */ |
| 375 | i = update_interval (i, charpos); |
| 376 | if (i->position != gl_state.e_property) |
| 377 | { |
| 378 | invalidate = 0; |
| 379 | gl_state.backward_i = i; |
| 380 | gl_state.b_property = i->position - gl_state.offset; |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | update: |
| 385 | tmp_table = textget (i->plist, Qsyntax_table); |
| 386 | |
| 387 | if (invalidate) |
| 388 | invalidate = !EQ (tmp_table, gl_state.old_prop); /* Need to invalidate? */ |
| 389 | |
| 390 | if (invalidate) /* Did not get to adjacent interval. */ |
| 391 | { /* with the same table => */ |
| 392 | /* invalidate the old range. */ |
| 393 | if (count > 0) |
| 394 | { |
| 395 | gl_state.backward_i = i; |
| 396 | gl_state.b_property = i->position - gl_state.offset; |
| 397 | } |
| 398 | else |
| 399 | { |
| 400 | gl_state.forward_i = i; |
| 401 | gl_state.e_property = INTERVAL_LAST_POS (i) - gl_state.offset; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | if (!EQ (tmp_table, gl_state.old_prop)) |
| 406 | { |
| 407 | gl_state.current_syntax_table = tmp_table; |
| 408 | gl_state.old_prop = tmp_table; |
| 409 | if (EQ (Fsyntax_table_p (tmp_table), Qt)) |
| 410 | { |
| 411 | gl_state.use_global = 0; |
| 412 | } |
| 413 | else if (CONSP (tmp_table)) |
| 414 | { |
| 415 | gl_state.use_global = 1; |
| 416 | gl_state.global_code = tmp_table; |
| 417 | } |
| 418 | else |
| 419 | { |
| 420 | gl_state.use_global = 0; |
| 421 | gl_state.current_syntax_table = BVAR (current_buffer, syntax_table); |
| 422 | } |
| 423 | } |
| 424 | |
| 425 | while (i) |
| 426 | { |
| 427 | if (cnt && !EQ (tmp_table, textget (i->plist, Qsyntax_table))) |
| 428 | { |
| 429 | if (count > 0) |
| 430 | { |
| 431 | gl_state.e_property = i->position - gl_state.offset; |
| 432 | gl_state.forward_i = i; |
| 433 | } |
| 434 | else |
| 435 | { |
| 436 | gl_state.b_property |
| 437 | = i->position + LENGTH (i) - gl_state.offset; |
| 438 | gl_state.backward_i = i; |
| 439 | } |
| 440 | return; |
| 441 | } |
| 442 | else if (cnt == INTERVALS_AT_ONCE) |
| 443 | { |
| 444 | if (count > 0) |
| 445 | { |
| 446 | gl_state.e_property |
| 447 | = i->position + LENGTH (i) - gl_state.offset |
| 448 | /* e_property at EOB is not set to ZV but to ZV+1, so that |
| 449 | we can do INC(from);UPDATE_SYNTAX_TABLE_FORWARD without |
| 450 | having to check eob between the two. */ |
| 451 | + (next_interval (i) ? 0 : 1); |
| 452 | gl_state.forward_i = i; |
| 453 | } |
| 454 | else |
| 455 | { |
| 456 | gl_state.b_property = i->position - gl_state.offset; |
| 457 | gl_state.backward_i = i; |
| 458 | } |
| 459 | return; |
| 460 | } |
| 461 | cnt++; |
| 462 | i = count > 0 ? next_interval (i) : previous_interval (i); |
| 463 | } |
| 464 | eassert (i == NULL); /* This property goes to the end. */ |
| 465 | if (count > 0) |
| 466 | gl_state.e_property = gl_state.stop; |
| 467 | else |
| 468 | gl_state.b_property = gl_state.start; |
| 469 | } |
| 470 | \f |
| 471 | /* Returns true if char at CHARPOS is quoted. |
| 472 | Global syntax-table data should be set up already to be good at CHARPOS |
| 473 | or after. On return global syntax data is good for lookup at CHARPOS. */ |
| 474 | |
| 475 | static bool |
| 476 | char_quoted (ptrdiff_t charpos, ptrdiff_t bytepos) |
| 477 | { |
| 478 | enum syntaxcode code; |
| 479 | ptrdiff_t beg = BEGV; |
| 480 | bool quoted = 0; |
| 481 | ptrdiff_t orig = charpos; |
| 482 | |
| 483 | while (charpos > beg) |
| 484 | { |
| 485 | int c; |
| 486 | DEC_BOTH (charpos, bytepos); |
| 487 | |
| 488 | UPDATE_SYNTAX_TABLE_BACKWARD (charpos); |
| 489 | c = FETCH_CHAR_AS_MULTIBYTE (bytepos); |
| 490 | code = SYNTAX (c); |
| 491 | if (! (code == Scharquote || code == Sescape)) |
| 492 | break; |
| 493 | |
| 494 | quoted = !quoted; |
| 495 | } |
| 496 | |
| 497 | UPDATE_SYNTAX_TABLE (orig); |
| 498 | return quoted; |
| 499 | } |
| 500 | |
| 501 | /* Return the bytepos one character before BYTEPOS. |
| 502 | We assume that BYTEPOS is not at the start of the buffer. */ |
| 503 | |
| 504 | static ptrdiff_t |
| 505 | dec_bytepos (ptrdiff_t bytepos) |
| 506 | { |
| 507 | if (NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 508 | return bytepos - 1; |
| 509 | |
| 510 | DEC_POS (bytepos); |
| 511 | return bytepos; |
| 512 | } |
| 513 | \f |
| 514 | /* Return a defun-start position before POS and not too far before. |
| 515 | It should be the last one before POS, or nearly the last. |
| 516 | |
| 517 | When open_paren_in_column_0_is_defun_start is nonzero, |
| 518 | only the beginning of the buffer is treated as a defun-start. |
| 519 | |
| 520 | We record the information about where the scan started |
| 521 | and what its result was, so that another call in the same area |
| 522 | can return the same value very quickly. |
| 523 | |
| 524 | There is no promise at which position the global syntax data is |
| 525 | valid on return from the subroutine, so the caller should explicitly |
| 526 | update the global data. */ |
| 527 | |
| 528 | static ptrdiff_t |
| 529 | find_defun_start (ptrdiff_t pos, ptrdiff_t pos_byte) |
| 530 | { |
| 531 | ptrdiff_t opoint = PT, opoint_byte = PT_BYTE; |
| 532 | |
| 533 | if (!open_paren_in_column_0_is_defun_start) |
| 534 | { |
| 535 | find_start_value = BEGV; |
| 536 | find_start_value_byte = BEGV_BYTE; |
| 537 | find_start_buffer = current_buffer; |
| 538 | find_start_modiff = MODIFF; |
| 539 | find_start_begv = BEGV; |
| 540 | find_start_pos = pos; |
| 541 | return BEGV; |
| 542 | } |
| 543 | |
| 544 | /* Use previous finding, if it's valid and applies to this inquiry. */ |
| 545 | if (current_buffer == find_start_buffer |
| 546 | /* Reuse the defun-start even if POS is a little farther on. |
| 547 | POS might be in the next defun, but that's ok. |
| 548 | Our value may not be the best possible, but will still be usable. */ |
| 549 | && pos <= find_start_pos + 1000 |
| 550 | && pos >= find_start_value |
| 551 | && BEGV == find_start_begv |
| 552 | && MODIFF == find_start_modiff) |
| 553 | return find_start_value; |
| 554 | |
| 555 | /* Back up to start of line. */ |
| 556 | scan_newline (pos, pos_byte, BEGV, BEGV_BYTE, -1, 1); |
| 557 | |
| 558 | /* We optimize syntax-table lookup for rare updates. Thus we accept |
| 559 | only those `^\s(' which are good in global _and_ text-property |
| 560 | syntax-tables. */ |
| 561 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 562 | while (PT > BEGV) |
| 563 | { |
| 564 | int c; |
| 565 | |
| 566 | /* Open-paren at start of line means we may have found our |
| 567 | defun-start. */ |
| 568 | c = FETCH_CHAR_AS_MULTIBYTE (PT_BYTE); |
| 569 | if (SYNTAX (c) == Sopen) |
| 570 | { |
| 571 | SETUP_SYNTAX_TABLE (PT + 1, -1); /* Try again... */ |
| 572 | c = FETCH_CHAR_AS_MULTIBYTE (PT_BYTE); |
| 573 | if (SYNTAX (c) == Sopen) |
| 574 | break; |
| 575 | /* Now fallback to the default value. */ |
| 576 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 577 | } |
| 578 | /* Move to beg of previous line. */ |
| 579 | scan_newline (PT, PT_BYTE, BEGV, BEGV_BYTE, -2, 1); |
| 580 | } |
| 581 | |
| 582 | /* Record what we found, for the next try. */ |
| 583 | find_start_value = PT; |
| 584 | find_start_value_byte = PT_BYTE; |
| 585 | find_start_buffer = current_buffer; |
| 586 | find_start_modiff = MODIFF; |
| 587 | find_start_begv = BEGV; |
| 588 | find_start_pos = pos; |
| 589 | |
| 590 | TEMP_SET_PT_BOTH (opoint, opoint_byte); |
| 591 | |
| 592 | return find_start_value; |
| 593 | } |
| 594 | \f |
| 595 | /* Return the SYNTAX_COMEND_FIRST of the character before POS, POS_BYTE. */ |
| 596 | |
| 597 | static bool |
| 598 | prev_char_comend_first (ptrdiff_t pos, ptrdiff_t pos_byte) |
| 599 | { |
| 600 | int c; |
| 601 | bool val; |
| 602 | |
| 603 | DEC_BOTH (pos, pos_byte); |
| 604 | UPDATE_SYNTAX_TABLE_BACKWARD (pos); |
| 605 | c = FETCH_CHAR (pos_byte); |
| 606 | val = SYNTAX_COMEND_FIRST (c); |
| 607 | UPDATE_SYNTAX_TABLE_FORWARD (pos + 1); |
| 608 | return val; |
| 609 | } |
| 610 | |
| 611 | /* Check whether charpos FROM is at the end of a comment. |
| 612 | FROM_BYTE is the bytepos corresponding to FROM. |
| 613 | Do not move back before STOP. |
| 614 | |
| 615 | Return true if we find a comment ending at FROM/FROM_BYTE. |
| 616 | |
| 617 | If successful, store the charpos of the comment's beginning |
| 618 | into *CHARPOS_PTR, and the bytepos into *BYTEPOS_PTR. |
| 619 | |
| 620 | Global syntax data remains valid for backward search starting at |
| 621 | the returned value (or at FROM, if the search was not successful). */ |
| 622 | |
| 623 | static bool |
| 624 | back_comment (ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t stop, |
| 625 | bool comnested, int comstyle, ptrdiff_t *charpos_ptr, |
| 626 | ptrdiff_t *bytepos_ptr) |
| 627 | { |
| 628 | /* Look back, counting the parity of string-quotes, |
| 629 | and recording the comment-starters seen. |
| 630 | When we reach a safe place, assume that's not in a string; |
| 631 | then step the main scan to the earliest comment-starter seen |
| 632 | an even number of string quotes away from the safe place. |
| 633 | |
| 634 | OFROM[I] is position of the earliest comment-starter seen |
| 635 | which is I+2X quotes from the comment-end. |
| 636 | PARITY is current parity of quotes from the comment end. */ |
| 637 | int string_style = -1; /* Presumed outside of any string. */ |
| 638 | bool string_lossage = 0; |
| 639 | /* Not a real lossage: indicates that we have passed a matching comment |
| 640 | starter plus a non-matching comment-ender, meaning that any matching |
| 641 | comment-starter we might see later could be a false positive (hidden |
| 642 | inside another comment). |
| 643 | Test case: { a (* b } c (* d *) */ |
| 644 | bool comment_lossage = 0; |
| 645 | ptrdiff_t comment_end = from; |
| 646 | ptrdiff_t comment_end_byte = from_byte; |
| 647 | ptrdiff_t comstart_pos = 0; |
| 648 | ptrdiff_t comstart_byte IF_LINT (= 0); |
| 649 | /* Place where the containing defun starts, |
| 650 | or 0 if we didn't come across it yet. */ |
| 651 | ptrdiff_t defun_start = 0; |
| 652 | ptrdiff_t defun_start_byte = 0; |
| 653 | enum syntaxcode code; |
| 654 | ptrdiff_t nesting = 1; /* current comment nesting */ |
| 655 | int c; |
| 656 | int syntax = 0; |
| 657 | |
| 658 | /* FIXME: A }} comment-ender style leads to incorrect behavior |
| 659 | in the case of {{ c }}} because we ignore the last two chars which are |
| 660 | assumed to be comment-enders although they aren't. */ |
| 661 | |
| 662 | /* At beginning of range to scan, we're outside of strings; |
| 663 | that determines quote parity to the comment-end. */ |
| 664 | while (from != stop) |
| 665 | { |
| 666 | ptrdiff_t temp_byte; |
| 667 | int prev_syntax; |
| 668 | bool com2start, com2end, comstart; |
| 669 | |
| 670 | /* Move back and examine a character. */ |
| 671 | DEC_BOTH (from, from_byte); |
| 672 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 673 | |
| 674 | prev_syntax = syntax; |
| 675 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 676 | syntax = SYNTAX_WITH_FLAGS (c); |
| 677 | code = SYNTAX (c); |
| 678 | |
| 679 | /* Check for 2-char comment markers. */ |
| 680 | com2start = (SYNTAX_FLAGS_COMSTART_FIRST (syntax) |
| 681 | && SYNTAX_FLAGS_COMSTART_SECOND (prev_syntax) |
| 682 | && (comstyle |
| 683 | == SYNTAX_FLAGS_COMMENT_STYLE (prev_syntax, syntax)) |
| 684 | && (SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax) |
| 685 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested); |
| 686 | com2end = (SYNTAX_FLAGS_COMEND_FIRST (syntax) |
| 687 | && SYNTAX_FLAGS_COMEND_SECOND (prev_syntax)); |
| 688 | comstart = (com2start || code == Scomment); |
| 689 | |
| 690 | /* Nasty cases with overlapping 2-char comment markers: |
| 691 | - snmp-mode: -- c -- foo -- c -- |
| 692 | --- c -- |
| 693 | ------ c -- |
| 694 | - c-mode: *||* |
| 695 | |* *|* *| |
| 696 | |*| |* |*| |
| 697 | /// */ |
| 698 | |
| 699 | /* If a 2-char comment sequence partly overlaps with another, |
| 700 | we don't try to be clever. E.g. |*| in C, or }% in modes that |
| 701 | have %..\n and %{..}%. */ |
| 702 | if (from > stop && (com2end || comstart)) |
| 703 | { |
| 704 | ptrdiff_t next = from, next_byte = from_byte; |
| 705 | int next_c, next_syntax; |
| 706 | DEC_BOTH (next, next_byte); |
| 707 | UPDATE_SYNTAX_TABLE_BACKWARD (next); |
| 708 | next_c = FETCH_CHAR_AS_MULTIBYTE (next_byte); |
| 709 | next_syntax = SYNTAX_WITH_FLAGS (next_c); |
| 710 | if (((comstart || comnested) |
| 711 | && SYNTAX_FLAGS_COMEND_SECOND (syntax) |
| 712 | && SYNTAX_FLAGS_COMEND_FIRST (next_syntax)) |
| 713 | || ((com2end || comnested) |
| 714 | && SYNTAX_FLAGS_COMSTART_SECOND (syntax) |
| 715 | && (comstyle |
| 716 | == SYNTAX_FLAGS_COMMENT_STYLE (syntax, prev_syntax)) |
| 717 | && SYNTAX_FLAGS_COMSTART_FIRST (next_syntax))) |
| 718 | goto lossage; |
| 719 | /* UPDATE_SYNTAX_TABLE_FORWARD (next + 1); */ |
| 720 | } |
| 721 | |
| 722 | if (com2start && comstart_pos == 0) |
| 723 | /* We're looking at a comment starter. But it might be a comment |
| 724 | ender as well (see snmp-mode). The first time we see one, we |
| 725 | need to consider it as a comment starter, |
| 726 | and the subsequent times as a comment ender. */ |
| 727 | com2end = 0; |
| 728 | |
| 729 | /* Turn a 2-char comment sequences into the appropriate syntax. */ |
| 730 | if (com2end) |
| 731 | code = Sendcomment; |
| 732 | else if (com2start) |
| 733 | code = Scomment; |
| 734 | /* Ignore comment starters of a different style. */ |
| 735 | else if (code == Scomment |
| 736 | && (comstyle != SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) |
| 737 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax) != comnested)) |
| 738 | continue; |
| 739 | |
| 740 | /* Ignore escaped characters, except comment-enders. */ |
| 741 | if (code != Sendcomment && char_quoted (from, from_byte)) |
| 742 | continue; |
| 743 | |
| 744 | switch (code) |
| 745 | { |
| 746 | case Sstring_fence: |
| 747 | case Scomment_fence: |
| 748 | c = (code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE); |
| 749 | case Sstring: |
| 750 | /* Track parity of quotes. */ |
| 751 | if (string_style == -1) |
| 752 | /* Entering a string. */ |
| 753 | string_style = c; |
| 754 | else if (string_style == c) |
| 755 | /* Leaving the string. */ |
| 756 | string_style = -1; |
| 757 | else |
| 758 | /* If we have two kinds of string delimiters. |
| 759 | There's no way to grok this scanning backwards. */ |
| 760 | string_lossage = 1; |
| 761 | break; |
| 762 | |
| 763 | case Scomment: |
| 764 | /* We've already checked that it is the relevant comstyle. */ |
| 765 | if (string_style != -1 || comment_lossage || string_lossage) |
| 766 | /* There are odd string quotes involved, so let's be careful. |
| 767 | Test case in Pascal: " { " a { " } */ |
| 768 | goto lossage; |
| 769 | |
| 770 | if (!comnested) |
| 771 | { |
| 772 | /* Record best comment-starter so far. */ |
| 773 | comstart_pos = from; |
| 774 | comstart_byte = from_byte; |
| 775 | } |
| 776 | else if (--nesting <= 0) |
| 777 | /* nested comments have to be balanced, so we don't need to |
| 778 | keep looking for earlier ones. We use here the same (slightly |
| 779 | incorrect) reasoning as below: since it is followed by uniform |
| 780 | paired string quotes, this comment-start has to be outside of |
| 781 | strings, else the comment-end itself would be inside a string. */ |
| 782 | goto done; |
| 783 | break; |
| 784 | |
| 785 | case Sendcomment: |
| 786 | if (SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == comstyle |
| 787 | && ((com2end && SYNTAX_FLAGS_COMMENT_NESTED (prev_syntax)) |
| 788 | || SYNTAX_FLAGS_COMMENT_NESTED (syntax)) == comnested) |
| 789 | /* This is the same style of comment ender as ours. */ |
| 790 | { |
| 791 | if (comnested) |
| 792 | nesting++; |
| 793 | else |
| 794 | /* Anything before that can't count because it would match |
| 795 | this comment-ender rather than ours. */ |
| 796 | from = stop; /* Break out of the loop. */ |
| 797 | } |
| 798 | else if (comstart_pos != 0 || c != '\n') |
| 799 | /* We're mixing comment styles here, so we'd better be careful. |
| 800 | The (comstart_pos != 0 || c != '\n') check is not quite correct |
| 801 | (we should just always set comment_lossage), but removing it |
| 802 | would imply that any multiline comment in C would go through |
| 803 | lossage, which seems overkill. |
| 804 | The failure should only happen in the rare cases such as |
| 805 | { (* } *) */ |
| 806 | comment_lossage = 1; |
| 807 | break; |
| 808 | |
| 809 | case Sopen: |
| 810 | /* Assume a defun-start point is outside of strings. */ |
| 811 | if (open_paren_in_column_0_is_defun_start |
| 812 | && (from == stop |
| 813 | || (temp_byte = dec_bytepos (from_byte), |
| 814 | FETCH_CHAR (temp_byte) == '\n'))) |
| 815 | { |
| 816 | defun_start = from; |
| 817 | defun_start_byte = from_byte; |
| 818 | from = stop; /* Break out of the loop. */ |
| 819 | } |
| 820 | break; |
| 821 | |
| 822 | default: |
| 823 | break; |
| 824 | } |
| 825 | } |
| 826 | |
| 827 | if (comstart_pos == 0) |
| 828 | { |
| 829 | from = comment_end; |
| 830 | from_byte = comment_end_byte; |
| 831 | UPDATE_SYNTAX_TABLE_FORWARD (comment_end - 1); |
| 832 | } |
| 833 | /* If comstart_pos is set and we get here (ie. didn't jump to `lossage' |
| 834 | or `done'), then we've found the beginning of the non-nested comment. */ |
| 835 | else if (1) /* !comnested */ |
| 836 | { |
| 837 | from = comstart_pos; |
| 838 | from_byte = comstart_byte; |
| 839 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
| 840 | } |
| 841 | else |
| 842 | { |
| 843 | struct lisp_parse_state state; |
| 844 | lossage: |
| 845 | /* We had two kinds of string delimiters mixed up |
| 846 | together. Decode this going forwards. |
| 847 | Scan fwd from a known safe place (beginning-of-defun) |
| 848 | to the one in question; this records where we |
| 849 | last passed a comment starter. */ |
| 850 | /* If we did not already find the defun start, find it now. */ |
| 851 | if (defun_start == 0) |
| 852 | { |
| 853 | defun_start = find_defun_start (comment_end, comment_end_byte); |
| 854 | defun_start_byte = find_start_value_byte; |
| 855 | } |
| 856 | do |
| 857 | { |
| 858 | scan_sexps_forward (&state, |
| 859 | defun_start, defun_start_byte, |
| 860 | comment_end, TYPE_MINIMUM (EMACS_INT), |
| 861 | 0, Qnil, 0); |
| 862 | defun_start = comment_end; |
| 863 | if (state.incomment == (comnested ? 1 : -1) |
| 864 | && state.comstyle == comstyle) |
| 865 | from = state.comstr_start; |
| 866 | else |
| 867 | { |
| 868 | from = comment_end; |
| 869 | if (state.incomment) |
| 870 | /* If comment_end is inside some other comment, maybe ours |
| 871 | is nested, so we need to try again from within the |
| 872 | surrounding comment. Example: { a (* " *) */ |
| 873 | { |
| 874 | /* FIXME: We should advance by one or two chars. */ |
| 875 | defun_start = state.comstr_start + 2; |
| 876 | defun_start_byte = CHAR_TO_BYTE (defun_start); |
| 877 | } |
| 878 | } |
| 879 | } while (defun_start < comment_end); |
| 880 | |
| 881 | from_byte = CHAR_TO_BYTE (from); |
| 882 | UPDATE_SYNTAX_TABLE_FORWARD (from - 1); |
| 883 | } |
| 884 | |
| 885 | done: |
| 886 | *charpos_ptr = from; |
| 887 | *bytepos_ptr = from_byte; |
| 888 | |
| 889 | return from != comment_end; |
| 890 | } |
| 891 | \f |
| 892 | DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0, |
| 893 | doc: /* Return t if OBJECT is a syntax table. |
| 894 | Currently, any char-table counts as a syntax table. */) |
| 895 | (Lisp_Object object) |
| 896 | { |
| 897 | if (CHAR_TABLE_P (object) |
| 898 | && EQ (XCHAR_TABLE (object)->purpose, Qsyntax_table)) |
| 899 | return Qt; |
| 900 | return Qnil; |
| 901 | } |
| 902 | |
| 903 | static void |
| 904 | check_syntax_table (Lisp_Object obj) |
| 905 | { |
| 906 | CHECK_TYPE (CHAR_TABLE_P (obj) && EQ (XCHAR_TABLE (obj)->purpose, Qsyntax_table), |
| 907 | Qsyntax_table_p, obj); |
| 908 | } |
| 909 | |
| 910 | DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0, |
| 911 | doc: /* Return the current syntax table. |
| 912 | This is the one specified by the current buffer. */) |
| 913 | (void) |
| 914 | { |
| 915 | return BVAR (current_buffer, syntax_table); |
| 916 | } |
| 917 | |
| 918 | DEFUN ("standard-syntax-table", Fstandard_syntax_table, |
| 919 | Sstandard_syntax_table, 0, 0, 0, |
| 920 | doc: /* Return the standard syntax table. |
| 921 | This is the one used for new buffers. */) |
| 922 | (void) |
| 923 | { |
| 924 | return Vstandard_syntax_table; |
| 925 | } |
| 926 | |
| 927 | DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0, |
| 928 | doc: /* Construct a new syntax table and return it. |
| 929 | It is a copy of the TABLE, which defaults to the standard syntax table. */) |
| 930 | (Lisp_Object table) |
| 931 | { |
| 932 | Lisp_Object copy; |
| 933 | |
| 934 | if (!NILP (table)) |
| 935 | check_syntax_table (table); |
| 936 | else |
| 937 | table = Vstandard_syntax_table; |
| 938 | |
| 939 | copy = Fcopy_sequence (table); |
| 940 | |
| 941 | /* Only the standard syntax table should have a default element. |
| 942 | Other syntax tables should inherit from parents instead. */ |
| 943 | set_char_table_defalt (copy, Qnil); |
| 944 | |
| 945 | /* Copied syntax tables should all have parents. |
| 946 | If we copied one with no parent, such as the standard syntax table, |
| 947 | use the standard syntax table as the copy's parent. */ |
| 948 | if (NILP (XCHAR_TABLE (copy)->parent)) |
| 949 | Fset_char_table_parent (copy, Vstandard_syntax_table); |
| 950 | return copy; |
| 951 | } |
| 952 | |
| 953 | DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0, |
| 954 | doc: /* Select a new syntax table for the current buffer. |
| 955 | One argument, a syntax table. */) |
| 956 | (Lisp_Object table) |
| 957 | { |
| 958 | int idx; |
| 959 | check_syntax_table (table); |
| 960 | bset_syntax_table (current_buffer, table); |
| 961 | /* Indicate that this buffer now has a specified syntax table. */ |
| 962 | idx = PER_BUFFER_VAR_IDX (syntax_table); |
| 963 | SET_PER_BUFFER_VALUE_P (current_buffer, idx, 1); |
| 964 | return table; |
| 965 | } |
| 966 | \f |
| 967 | /* Convert a letter which signifies a syntax code |
| 968 | into the code it signifies. |
| 969 | This is used by modify-syntax-entry, and other things. */ |
| 970 | |
| 971 | unsigned char const syntax_spec_code[0400] = |
| 972 | { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 973 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 974 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 975 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 976 | Swhitespace, Scomment_fence, Sstring, 0377, Smath, 0377, 0377, Squote, |
| 977 | Sopen, Sclose, 0377, 0377, 0377, Swhitespace, Spunct, Scharquote, |
| 978 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 979 | 0377, 0377, 0377, 0377, Scomment, 0377, Sendcomment, 0377, |
| 980 | Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */ |
| 981 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 982 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, Sword, |
| 983 | 0377, 0377, 0377, 0377, Sescape, 0377, 0377, Ssymbol, |
| 984 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */ |
| 985 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, |
| 986 | 0377, 0377, 0377, 0377, 0377, 0377, 0377, Sword, |
| 987 | 0377, 0377, 0377, 0377, Sstring_fence, 0377, 0377, 0377 |
| 988 | }; |
| 989 | |
| 990 | /* Indexed by syntax code, give the letter that describes it. */ |
| 991 | |
| 992 | char const syntax_code_spec[16] = |
| 993 | { |
| 994 | ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@', |
| 995 | '!', '|' |
| 996 | }; |
| 997 | |
| 998 | /* Indexed by syntax code, give the object (cons of syntax code and |
| 999 | nil) to be stored in syntax table. Since these objects can be |
| 1000 | shared among syntax tables, we generate them in advance. By |
| 1001 | sharing objects, the function `describe-syntax' can give a more |
| 1002 | compact listing. */ |
| 1003 | static Lisp_Object Vsyntax_code_object; |
| 1004 | |
| 1005 | \f |
| 1006 | DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0, |
| 1007 | doc: /* Return the syntax code of CHARACTER, described by a character. |
| 1008 | For example, if CHARACTER is a word constituent, the |
| 1009 | character `w' (119) is returned. |
| 1010 | The characters that correspond to various syntax codes |
| 1011 | are listed in the documentation of `modify-syntax-entry'. */) |
| 1012 | (Lisp_Object character) |
| 1013 | { |
| 1014 | int char_int; |
| 1015 | CHECK_CHARACTER (character); |
| 1016 | char_int = XINT (character); |
| 1017 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 1018 | return make_number (syntax_code_spec[SYNTAX (char_int)]); |
| 1019 | } |
| 1020 | |
| 1021 | DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 1, 0, |
| 1022 | doc: /* Return the matching parenthesis of CHARACTER, or nil if none. */) |
| 1023 | (Lisp_Object character) |
| 1024 | { |
| 1025 | int char_int; |
| 1026 | enum syntaxcode code; |
| 1027 | CHECK_CHARACTER (character); |
| 1028 | char_int = XINT (character); |
| 1029 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 1030 | code = SYNTAX (char_int); |
| 1031 | if (code == Sopen || code == Sclose) |
| 1032 | return SYNTAX_MATCH (char_int); |
| 1033 | return Qnil; |
| 1034 | } |
| 1035 | |
| 1036 | DEFUN ("string-to-syntax", Fstring_to_syntax, Sstring_to_syntax, 1, 1, 0, |
| 1037 | doc: /* Convert a syntax descriptor STRING into a raw syntax descriptor. |
| 1038 | STRING should be a string of the form allowed as argument of |
| 1039 | `modify-syntax-entry'. The return value is a raw syntax descriptor: a |
| 1040 | cons cell \(CODE . MATCHING-CHAR) which can be used, for example, as |
| 1041 | the value of a `syntax-table' text property. */) |
| 1042 | (Lisp_Object string) |
| 1043 | { |
| 1044 | const unsigned char *p; |
| 1045 | int val; |
| 1046 | Lisp_Object match; |
| 1047 | |
| 1048 | CHECK_STRING (string); |
| 1049 | |
| 1050 | p = SDATA (string); |
| 1051 | val = syntax_spec_code[*p++]; |
| 1052 | if (val == 0377) |
| 1053 | error ("Invalid syntax description letter: %c", p[-1]); |
| 1054 | |
| 1055 | if (val == Sinherit) |
| 1056 | return Qnil; |
| 1057 | |
| 1058 | if (*p) |
| 1059 | { |
| 1060 | int len; |
| 1061 | int character = STRING_CHAR_AND_LENGTH (p, len); |
| 1062 | XSETINT (match, character); |
| 1063 | if (XFASTINT (match) == ' ') |
| 1064 | match = Qnil; |
| 1065 | p += len; |
| 1066 | } |
| 1067 | else |
| 1068 | match = Qnil; |
| 1069 | |
| 1070 | while (*p) |
| 1071 | switch (*p++) |
| 1072 | { |
| 1073 | case '1': |
| 1074 | val |= 1 << 16; |
| 1075 | break; |
| 1076 | |
| 1077 | case '2': |
| 1078 | val |= 1 << 17; |
| 1079 | break; |
| 1080 | |
| 1081 | case '3': |
| 1082 | val |= 1 << 18; |
| 1083 | break; |
| 1084 | |
| 1085 | case '4': |
| 1086 | val |= 1 << 19; |
| 1087 | break; |
| 1088 | |
| 1089 | case 'p': |
| 1090 | val |= 1 << 20; |
| 1091 | break; |
| 1092 | |
| 1093 | case 'b': |
| 1094 | val |= 1 << 21; |
| 1095 | break; |
| 1096 | |
| 1097 | case 'n': |
| 1098 | val |= 1 << 22; |
| 1099 | break; |
| 1100 | |
| 1101 | case 'c': |
| 1102 | val |= 1 << 23; |
| 1103 | break; |
| 1104 | } |
| 1105 | |
| 1106 | if (val < ASIZE (Vsyntax_code_object) && NILP (match)) |
| 1107 | return AREF (Vsyntax_code_object, val); |
| 1108 | else |
| 1109 | /* Since we can't use a shared object, let's make a new one. */ |
| 1110 | return Fcons (make_number (val), match); |
| 1111 | } |
| 1112 | |
| 1113 | /* I really don't know why this is interactive |
| 1114 | help-form should at least be made useful whilst reading the second arg. */ |
| 1115 | DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3, |
| 1116 | "cSet syntax for character: \nsSet syntax for %s to: ", |
| 1117 | doc: /* Set syntax for character CHAR according to string NEWENTRY. |
| 1118 | The syntax is changed only for table SYNTAX-TABLE, which defaults to |
| 1119 | the current buffer's syntax table. |
| 1120 | CHAR may be a cons (MIN . MAX), in which case, syntaxes of all characters |
| 1121 | in the range MIN to MAX are changed. |
| 1122 | The first character of NEWENTRY should be one of the following: |
| 1123 | Space or - whitespace syntax. w word constituent. |
| 1124 | _ symbol constituent. . punctuation. |
| 1125 | ( open-parenthesis. ) close-parenthesis. |
| 1126 | " string quote. \\ escape. |
| 1127 | $ paired delimiter. ' expression quote or prefix operator. |
| 1128 | < comment starter. > comment ender. |
| 1129 | / character-quote. @ inherit from parent table. |
| 1130 | | generic string fence. ! generic comment fence. |
| 1131 | |
| 1132 | Only single-character comment start and end sequences are represented thus. |
| 1133 | Two-character sequences are represented as described below. |
| 1134 | The second character of NEWENTRY is the matching parenthesis, |
| 1135 | used only if the first character is `(' or `)'. |
| 1136 | Any additional characters are flags. |
| 1137 | Defined flags are the characters 1, 2, 3, 4, b, p, and n. |
| 1138 | 1 means CHAR is the start of a two-char comment start sequence. |
| 1139 | 2 means CHAR is the second character of such a sequence. |
| 1140 | 3 means CHAR is the start of a two-char comment end sequence. |
| 1141 | 4 means CHAR is the second character of such a sequence. |
| 1142 | |
| 1143 | There can be several orthogonal comment sequences. This is to support |
| 1144 | language modes such as C++. By default, all comment sequences are of style |
| 1145 | a, but you can set the comment sequence style to b (on the second character |
| 1146 | of a comment-start, and the first character of a comment-end sequence) and/or |
| 1147 | c (on any of its chars) using this flag: |
| 1148 | b means CHAR is part of comment sequence b. |
| 1149 | c means CHAR is part of comment sequence c. |
| 1150 | n means CHAR is part of a nestable comment sequence. |
| 1151 | |
| 1152 | p means CHAR is a prefix character for `backward-prefix-chars'; |
| 1153 | such characters are treated as whitespace when they occur |
| 1154 | between expressions. |
| 1155 | usage: (modify-syntax-entry CHAR NEWENTRY &optional SYNTAX-TABLE) */) |
| 1156 | (Lisp_Object c, Lisp_Object newentry, Lisp_Object syntax_table) |
| 1157 | { |
| 1158 | if (CONSP (c)) |
| 1159 | { |
| 1160 | CHECK_CHARACTER_CAR (c); |
| 1161 | CHECK_CHARACTER_CDR (c); |
| 1162 | } |
| 1163 | else |
| 1164 | CHECK_CHARACTER (c); |
| 1165 | |
| 1166 | if (NILP (syntax_table)) |
| 1167 | syntax_table = BVAR (current_buffer, syntax_table); |
| 1168 | else |
| 1169 | check_syntax_table (syntax_table); |
| 1170 | |
| 1171 | newentry = Fstring_to_syntax (newentry); |
| 1172 | if (CONSP (c)) |
| 1173 | SET_RAW_SYNTAX_ENTRY_RANGE (syntax_table, c, newentry); |
| 1174 | else |
| 1175 | SET_RAW_SYNTAX_ENTRY (syntax_table, XINT (c), newentry); |
| 1176 | |
| 1177 | /* We clear the regexp cache, since character classes can now have |
| 1178 | different values from those in the compiled regexps.*/ |
| 1179 | clear_regexp_cache (); |
| 1180 | |
| 1181 | return Qnil; |
| 1182 | } |
| 1183 | \f |
| 1184 | /* Dump syntax table to buffer in human-readable format */ |
| 1185 | |
| 1186 | DEFUN ("internal-describe-syntax-value", Finternal_describe_syntax_value, |
| 1187 | Sinternal_describe_syntax_value, 1, 1, 0, |
| 1188 | doc: /* Insert a description of the internal syntax description SYNTAX at point. */) |
| 1189 | (Lisp_Object syntax) |
| 1190 | { |
| 1191 | int code, syntax_code; |
| 1192 | bool start1, start2, end1, end2, prefix, comstyleb, comstylec, comnested; |
| 1193 | char str[2]; |
| 1194 | Lisp_Object first, match_lisp, value = syntax; |
| 1195 | |
| 1196 | if (NILP (value)) |
| 1197 | { |
| 1198 | insert_string ("default"); |
| 1199 | return syntax; |
| 1200 | } |
| 1201 | |
| 1202 | if (CHAR_TABLE_P (value)) |
| 1203 | { |
| 1204 | insert_string ("deeper char-table ..."); |
| 1205 | return syntax; |
| 1206 | } |
| 1207 | |
| 1208 | if (!CONSP (value)) |
| 1209 | { |
| 1210 | insert_string ("invalid"); |
| 1211 | return syntax; |
| 1212 | } |
| 1213 | |
| 1214 | first = XCAR (value); |
| 1215 | match_lisp = XCDR (value); |
| 1216 | |
| 1217 | if (!INTEGERP (first) || !(NILP (match_lisp) || CHARACTERP (match_lisp))) |
| 1218 | { |
| 1219 | insert_string ("invalid"); |
| 1220 | return syntax; |
| 1221 | } |
| 1222 | |
| 1223 | syntax_code = XINT (first) & INT_MAX; |
| 1224 | code = syntax_code & 0377; |
| 1225 | start1 = SYNTAX_FLAGS_COMSTART_FIRST (syntax_code); |
| 1226 | start2 = SYNTAX_FLAGS_COMSTART_SECOND (syntax_code);; |
| 1227 | end1 = SYNTAX_FLAGS_COMEND_FIRST (syntax_code); |
| 1228 | end2 = SYNTAX_FLAGS_COMEND_SECOND (syntax_code); |
| 1229 | prefix = SYNTAX_FLAGS_PREFIX (syntax_code); |
| 1230 | comstyleb = SYNTAX_FLAGS_COMMENT_STYLEB (syntax_code); |
| 1231 | comstylec = SYNTAX_FLAGS_COMMENT_STYLEC (syntax_code); |
| 1232 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax_code); |
| 1233 | |
| 1234 | if (Smax <= code) |
| 1235 | { |
| 1236 | insert_string ("invalid"); |
| 1237 | return syntax; |
| 1238 | } |
| 1239 | |
| 1240 | str[0] = syntax_code_spec[code], str[1] = 0; |
| 1241 | insert (str, 1); |
| 1242 | |
| 1243 | if (NILP (match_lisp)) |
| 1244 | insert (" ", 1); |
| 1245 | else |
| 1246 | insert_char (XINT (match_lisp)); |
| 1247 | |
| 1248 | if (start1) |
| 1249 | insert ("1", 1); |
| 1250 | if (start2) |
| 1251 | insert ("2", 1); |
| 1252 | |
| 1253 | if (end1) |
| 1254 | insert ("3", 1); |
| 1255 | if (end2) |
| 1256 | insert ("4", 1); |
| 1257 | |
| 1258 | if (prefix) |
| 1259 | insert ("p", 1); |
| 1260 | if (comstyleb) |
| 1261 | insert ("b", 1); |
| 1262 | if (comstylec) |
| 1263 | insert ("c", 1); |
| 1264 | if (comnested) |
| 1265 | insert ("n", 1); |
| 1266 | |
| 1267 | insert_string ("\twhich means: "); |
| 1268 | |
| 1269 | switch (code) |
| 1270 | { |
| 1271 | case Swhitespace: |
| 1272 | insert_string ("whitespace"); break; |
| 1273 | case Spunct: |
| 1274 | insert_string ("punctuation"); break; |
| 1275 | case Sword: |
| 1276 | insert_string ("word"); break; |
| 1277 | case Ssymbol: |
| 1278 | insert_string ("symbol"); break; |
| 1279 | case Sopen: |
| 1280 | insert_string ("open"); break; |
| 1281 | case Sclose: |
| 1282 | insert_string ("close"); break; |
| 1283 | case Squote: |
| 1284 | insert_string ("prefix"); break; |
| 1285 | case Sstring: |
| 1286 | insert_string ("string"); break; |
| 1287 | case Smath: |
| 1288 | insert_string ("math"); break; |
| 1289 | case Sescape: |
| 1290 | insert_string ("escape"); break; |
| 1291 | case Scharquote: |
| 1292 | insert_string ("charquote"); break; |
| 1293 | case Scomment: |
| 1294 | insert_string ("comment"); break; |
| 1295 | case Sendcomment: |
| 1296 | insert_string ("endcomment"); break; |
| 1297 | case Sinherit: |
| 1298 | insert_string ("inherit"); break; |
| 1299 | case Scomment_fence: |
| 1300 | insert_string ("comment fence"); break; |
| 1301 | case Sstring_fence: |
| 1302 | insert_string ("string fence"); break; |
| 1303 | default: |
| 1304 | insert_string ("invalid"); |
| 1305 | return syntax; |
| 1306 | } |
| 1307 | |
| 1308 | if (!NILP (match_lisp)) |
| 1309 | { |
| 1310 | insert_string (", matches "); |
| 1311 | insert_char (XINT (match_lisp)); |
| 1312 | } |
| 1313 | |
| 1314 | if (start1) |
| 1315 | insert_string (",\n\t is the first character of a comment-start sequence"); |
| 1316 | if (start2) |
| 1317 | insert_string (",\n\t is the second character of a comment-start sequence"); |
| 1318 | |
| 1319 | if (end1) |
| 1320 | insert_string (",\n\t is the first character of a comment-end sequence"); |
| 1321 | if (end2) |
| 1322 | insert_string (",\n\t is the second character of a comment-end sequence"); |
| 1323 | if (comstyleb) |
| 1324 | insert_string (" (comment style b)"); |
| 1325 | if (comstylec) |
| 1326 | insert_string (" (comment style c)"); |
| 1327 | if (comnested) |
| 1328 | insert_string (" (nestable)"); |
| 1329 | |
| 1330 | if (prefix) |
| 1331 | insert_string (",\n\t is a prefix character for `backward-prefix-chars'"); |
| 1332 | |
| 1333 | return syntax; |
| 1334 | } |
| 1335 | \f |
| 1336 | /* Return the position across COUNT words from FROM. |
| 1337 | If that many words cannot be found before the end of the buffer, return 0. |
| 1338 | COUNT negative means scan backward and stop at word beginning. */ |
| 1339 | |
| 1340 | ptrdiff_t |
| 1341 | scan_words (register ptrdiff_t from, register EMACS_INT count) |
| 1342 | { |
| 1343 | register ptrdiff_t beg = BEGV; |
| 1344 | register ptrdiff_t end = ZV; |
| 1345 | register ptrdiff_t from_byte = CHAR_TO_BYTE (from); |
| 1346 | register enum syntaxcode code; |
| 1347 | int ch0, ch1; |
| 1348 | Lisp_Object func, pos; |
| 1349 | |
| 1350 | immediate_quit = 1; |
| 1351 | QUIT; |
| 1352 | |
| 1353 | SETUP_SYNTAX_TABLE (from, count); |
| 1354 | |
| 1355 | while (count > 0) |
| 1356 | { |
| 1357 | while (1) |
| 1358 | { |
| 1359 | if (from == end) |
| 1360 | { |
| 1361 | immediate_quit = 0; |
| 1362 | return 0; |
| 1363 | } |
| 1364 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 1365 | ch0 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 1366 | code = SYNTAX (ch0); |
| 1367 | INC_BOTH (from, from_byte); |
| 1368 | if (words_include_escapes |
| 1369 | && (code == Sescape || code == Scharquote)) |
| 1370 | break; |
| 1371 | if (code == Sword) |
| 1372 | break; |
| 1373 | } |
| 1374 | /* Now CH0 is a character which begins a word and FROM is the |
| 1375 | position of the next character. */ |
| 1376 | func = CHAR_TABLE_REF (Vfind_word_boundary_function_table, ch0); |
| 1377 | if (! NILP (Ffboundp (func))) |
| 1378 | { |
| 1379 | pos = call2 (func, make_number (from - 1), make_number (end)); |
| 1380 | if (INTEGERP (pos) && from < XINT (pos) && XINT (pos) <= ZV) |
| 1381 | { |
| 1382 | from = XINT (pos); |
| 1383 | from_byte = CHAR_TO_BYTE (from); |
| 1384 | } |
| 1385 | } |
| 1386 | else |
| 1387 | { |
| 1388 | while (1) |
| 1389 | { |
| 1390 | if (from == end) break; |
| 1391 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 1392 | ch1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 1393 | code = SYNTAX (ch1); |
| 1394 | if ((code != Sword |
| 1395 | && (! words_include_escapes |
| 1396 | || (code != Sescape && code != Scharquote))) |
| 1397 | || word_boundary_p (ch0, ch1)) |
| 1398 | break; |
| 1399 | INC_BOTH (from, from_byte); |
| 1400 | ch0 = ch1; |
| 1401 | } |
| 1402 | } |
| 1403 | count--; |
| 1404 | } |
| 1405 | while (count < 0) |
| 1406 | { |
| 1407 | while (1) |
| 1408 | { |
| 1409 | if (from == beg) |
| 1410 | { |
| 1411 | immediate_quit = 0; |
| 1412 | return 0; |
| 1413 | } |
| 1414 | DEC_BOTH (from, from_byte); |
| 1415 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 1416 | ch1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 1417 | code = SYNTAX (ch1); |
| 1418 | if (words_include_escapes |
| 1419 | && (code == Sescape || code == Scharquote)) |
| 1420 | break; |
| 1421 | if (code == Sword) |
| 1422 | break; |
| 1423 | } |
| 1424 | /* Now CH1 is a character which ends a word and FROM is the |
| 1425 | position of it. */ |
| 1426 | func = CHAR_TABLE_REF (Vfind_word_boundary_function_table, ch1); |
| 1427 | if (! NILP (Ffboundp (func))) |
| 1428 | { |
| 1429 | pos = call2 (func, make_number (from), make_number (beg)); |
| 1430 | if (INTEGERP (pos) && BEGV <= XINT (pos) && XINT (pos) < from) |
| 1431 | { |
| 1432 | from = XINT (pos); |
| 1433 | from_byte = CHAR_TO_BYTE (from); |
| 1434 | } |
| 1435 | } |
| 1436 | else |
| 1437 | { |
| 1438 | while (1) |
| 1439 | { |
| 1440 | if (from == beg) |
| 1441 | break; |
| 1442 | DEC_BOTH (from, from_byte); |
| 1443 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 1444 | ch0 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 1445 | code = SYNTAX (ch0); |
| 1446 | if ((code != Sword |
| 1447 | && (! words_include_escapes |
| 1448 | || (code != Sescape && code != Scharquote))) |
| 1449 | || word_boundary_p (ch0, ch1)) |
| 1450 | { |
| 1451 | INC_BOTH (from, from_byte); |
| 1452 | break; |
| 1453 | } |
| 1454 | ch1 = ch0; |
| 1455 | } |
| 1456 | } |
| 1457 | count++; |
| 1458 | } |
| 1459 | |
| 1460 | immediate_quit = 0; |
| 1461 | |
| 1462 | return from; |
| 1463 | } |
| 1464 | |
| 1465 | DEFUN ("forward-word", Fforward_word, Sforward_word, 0, 1, "^p", |
| 1466 | doc: /* Move point forward ARG words (backward if ARG is negative). |
| 1467 | If ARG is omitted or nil, move point forward one word. |
| 1468 | Normally returns t. |
| 1469 | If an edge of the buffer or a field boundary is reached, point is left there |
| 1470 | and the function returns nil. Field boundaries are not noticed if |
| 1471 | `inhibit-field-text-motion' is non-nil. */) |
| 1472 | (Lisp_Object arg) |
| 1473 | { |
| 1474 | Lisp_Object tmp; |
| 1475 | ptrdiff_t orig_val, val; |
| 1476 | |
| 1477 | if (NILP (arg)) |
| 1478 | XSETFASTINT (arg, 1); |
| 1479 | else |
| 1480 | CHECK_NUMBER (arg); |
| 1481 | |
| 1482 | val = orig_val = scan_words (PT, XINT (arg)); |
| 1483 | if (! orig_val) |
| 1484 | val = XINT (arg) > 0 ? ZV : BEGV; |
| 1485 | |
| 1486 | /* Avoid jumping out of an input field. */ |
| 1487 | tmp = Fconstrain_to_field (make_number (val), make_number (PT), |
| 1488 | Qnil, Qnil, Qnil); |
| 1489 | val = XFASTINT (tmp); |
| 1490 | |
| 1491 | SET_PT (val); |
| 1492 | return val == orig_val ? Qt : Qnil; |
| 1493 | } |
| 1494 | \f |
| 1495 | DEFUN ("skip-chars-forward", Fskip_chars_forward, Sskip_chars_forward, 1, 2, 0, |
| 1496 | doc: /* Move point forward, stopping before a char not in STRING, or at pos LIM. |
| 1497 | STRING is like the inside of a `[...]' in a regular expression |
| 1498 | except that `]' is never special and `\\' quotes `^', `-' or `\\' |
| 1499 | (but not at the end of a range; quoting is never needed there). |
| 1500 | Thus, with arg "a-zA-Z", this skips letters stopping before first nonletter. |
| 1501 | With arg "^a-zA-Z", skips nonletters stopping before first letter. |
| 1502 | Char classes, e.g. `[:alpha:]', are supported. |
| 1503 | |
| 1504 | Returns the distance traveled, either zero or positive. */) |
| 1505 | (Lisp_Object string, Lisp_Object lim) |
| 1506 | { |
| 1507 | return skip_chars (1, string, lim, 1); |
| 1508 | } |
| 1509 | |
| 1510 | DEFUN ("skip-chars-backward", Fskip_chars_backward, Sskip_chars_backward, 1, 2, 0, |
| 1511 | doc: /* Move point backward, stopping after a char not in STRING, or at pos LIM. |
| 1512 | See `skip-chars-forward' for details. |
| 1513 | Returns the distance traveled, either zero or negative. */) |
| 1514 | (Lisp_Object string, Lisp_Object lim) |
| 1515 | { |
| 1516 | return skip_chars (0, string, lim, 1); |
| 1517 | } |
| 1518 | |
| 1519 | DEFUN ("skip-syntax-forward", Fskip_syntax_forward, Sskip_syntax_forward, 1, 2, 0, |
| 1520 | doc: /* Move point forward across chars in specified syntax classes. |
| 1521 | SYNTAX is a string of syntax code characters. |
| 1522 | Stop before a char whose syntax is not in SYNTAX, or at position LIM. |
| 1523 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. |
| 1524 | This function returns the distance traveled, either zero or positive. */) |
| 1525 | (Lisp_Object syntax, Lisp_Object lim) |
| 1526 | { |
| 1527 | return skip_syntaxes (1, syntax, lim); |
| 1528 | } |
| 1529 | |
| 1530 | DEFUN ("skip-syntax-backward", Fskip_syntax_backward, Sskip_syntax_backward, 1, 2, 0, |
| 1531 | doc: /* Move point backward across chars in specified syntax classes. |
| 1532 | SYNTAX is a string of syntax code characters. |
| 1533 | Stop on reaching a char whose syntax is not in SYNTAX, or at position LIM. |
| 1534 | If SYNTAX starts with ^, skip characters whose syntax is NOT in SYNTAX. |
| 1535 | This function returns either zero or a negative number, and the absolute value |
| 1536 | of this is the distance traveled. */) |
| 1537 | (Lisp_Object syntax, Lisp_Object lim) |
| 1538 | { |
| 1539 | return skip_syntaxes (0, syntax, lim); |
| 1540 | } |
| 1541 | |
| 1542 | static Lisp_Object |
| 1543 | skip_chars (bool forwardp, Lisp_Object string, Lisp_Object lim, |
| 1544 | bool handle_iso_classes) |
| 1545 | { |
| 1546 | int c; |
| 1547 | char fastmap[0400]; |
| 1548 | /* Store the ranges of non-ASCII characters. */ |
| 1549 | int *char_ranges IF_LINT (= NULL); |
| 1550 | int n_char_ranges = 0; |
| 1551 | bool negate = 0; |
| 1552 | ptrdiff_t i, i_byte; |
| 1553 | /* True if the current buffer is multibyte and the region contains |
| 1554 | non-ASCII chars. */ |
| 1555 | bool multibyte; |
| 1556 | /* True if STRING is multibyte and it contains non-ASCII chars. */ |
| 1557 | bool string_multibyte; |
| 1558 | ptrdiff_t size_byte; |
| 1559 | const unsigned char *str; |
| 1560 | int len; |
| 1561 | Lisp_Object iso_classes; |
| 1562 | |
| 1563 | CHECK_STRING (string); |
| 1564 | iso_classes = Qnil; |
| 1565 | |
| 1566 | if (NILP (lim)) |
| 1567 | XSETINT (lim, forwardp ? ZV : BEGV); |
| 1568 | else |
| 1569 | CHECK_NUMBER_COERCE_MARKER (lim); |
| 1570 | |
| 1571 | /* In any case, don't allow scan outside bounds of buffer. */ |
| 1572 | if (XINT (lim) > ZV) |
| 1573 | XSETFASTINT (lim, ZV); |
| 1574 | if (XINT (lim) < BEGV) |
| 1575 | XSETFASTINT (lim, BEGV); |
| 1576 | |
| 1577 | multibyte = (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
| 1578 | && (XINT (lim) - PT != CHAR_TO_BYTE (XINT (lim)) - PT_BYTE)); |
| 1579 | string_multibyte = SBYTES (string) > SCHARS (string); |
| 1580 | |
| 1581 | memset (fastmap, 0, sizeof fastmap); |
| 1582 | |
| 1583 | str = SDATA (string); |
| 1584 | size_byte = SBYTES (string); |
| 1585 | |
| 1586 | i_byte = 0; |
| 1587 | if (i_byte < size_byte |
| 1588 | && SREF (string, 0) == '^') |
| 1589 | { |
| 1590 | negate = 1; i_byte++; |
| 1591 | } |
| 1592 | |
| 1593 | /* Find the characters specified and set their elements of fastmap. |
| 1594 | Handle backslashes and ranges specially. |
| 1595 | |
| 1596 | If STRING contains non-ASCII characters, setup char_ranges for |
| 1597 | them and use fastmap only for their leading codes. */ |
| 1598 | |
| 1599 | if (! string_multibyte) |
| 1600 | { |
| 1601 | bool string_has_eight_bit = 0; |
| 1602 | |
| 1603 | /* At first setup fastmap. */ |
| 1604 | while (i_byte < size_byte) |
| 1605 | { |
| 1606 | c = str[i_byte++]; |
| 1607 | |
| 1608 | if (handle_iso_classes && c == '[' |
| 1609 | && i_byte < size_byte |
| 1610 | && str[i_byte] == ':') |
| 1611 | { |
| 1612 | const unsigned char *class_beg = str + i_byte + 1; |
| 1613 | const unsigned char *class_end = class_beg; |
| 1614 | const unsigned char *class_limit = str + size_byte - 2; |
| 1615 | /* Leave room for the null. */ |
| 1616 | unsigned char class_name[CHAR_CLASS_MAX_LENGTH + 1]; |
| 1617 | re_wctype_t cc; |
| 1618 | |
| 1619 | if (class_limit - class_beg > CHAR_CLASS_MAX_LENGTH) |
| 1620 | class_limit = class_beg + CHAR_CLASS_MAX_LENGTH; |
| 1621 | |
| 1622 | while (class_end < class_limit |
| 1623 | && *class_end >= 'a' && *class_end <= 'z') |
| 1624 | class_end++; |
| 1625 | |
| 1626 | if (class_end == class_beg |
| 1627 | || *class_end != ':' || class_end[1] != ']') |
| 1628 | goto not_a_class_name; |
| 1629 | |
| 1630 | memcpy (class_name, class_beg, class_end - class_beg); |
| 1631 | class_name[class_end - class_beg] = 0; |
| 1632 | |
| 1633 | cc = re_wctype (class_name); |
| 1634 | if (cc == 0) |
| 1635 | error ("Invalid ISO C character class"); |
| 1636 | |
| 1637 | iso_classes = Fcons (make_number (cc), iso_classes); |
| 1638 | |
| 1639 | i_byte = class_end + 2 - str; |
| 1640 | continue; |
| 1641 | } |
| 1642 | |
| 1643 | not_a_class_name: |
| 1644 | if (c == '\\') |
| 1645 | { |
| 1646 | if (i_byte == size_byte) |
| 1647 | break; |
| 1648 | |
| 1649 | c = str[i_byte++]; |
| 1650 | } |
| 1651 | /* Treat `-' as range character only if another character |
| 1652 | follows. */ |
| 1653 | if (i_byte + 1 < size_byte |
| 1654 | && str[i_byte] == '-') |
| 1655 | { |
| 1656 | int c2; |
| 1657 | |
| 1658 | /* Skip over the dash. */ |
| 1659 | i_byte++; |
| 1660 | |
| 1661 | /* Get the end of the range. */ |
| 1662 | c2 = str[i_byte++]; |
| 1663 | if (c2 == '\\' |
| 1664 | && i_byte < size_byte) |
| 1665 | c2 = str[i_byte++]; |
| 1666 | |
| 1667 | if (c <= c2) |
| 1668 | { |
| 1669 | int lim2 = c2 + 1; |
| 1670 | while (c < lim2) |
| 1671 | fastmap[c++] = 1; |
| 1672 | if (! ASCII_CHAR_P (c2)) |
| 1673 | string_has_eight_bit = 1; |
| 1674 | } |
| 1675 | } |
| 1676 | else |
| 1677 | { |
| 1678 | fastmap[c] = 1; |
| 1679 | if (! ASCII_CHAR_P (c)) |
| 1680 | string_has_eight_bit = 1; |
| 1681 | } |
| 1682 | } |
| 1683 | |
| 1684 | /* If the current range is multibyte and STRING contains |
| 1685 | eight-bit chars, arrange fastmap and setup char_ranges for |
| 1686 | the corresponding multibyte chars. */ |
| 1687 | if (multibyte && string_has_eight_bit) |
| 1688 | { |
| 1689 | char *p1; |
| 1690 | char himap[0200 + 1]; |
| 1691 | memcpy (himap, fastmap + 0200, 0200); |
| 1692 | himap[0200] = 0; |
| 1693 | memset (fastmap + 0200, 0, 0200); |
| 1694 | char_ranges = alloca (sizeof *char_ranges * 128 * 2); |
| 1695 | i = 0; |
| 1696 | |
| 1697 | while ((p1 = memchr (himap + i, 1, 0200 - i))) |
| 1698 | { |
| 1699 | /* Deduce the next range C..C2 from the next clump of 1s |
| 1700 | in HIMAP starting with &HIMAP[I]. HIMAP is the high |
| 1701 | order half of the old FASTMAP. */ |
| 1702 | int c2, leading_code; |
| 1703 | i = p1 - himap; |
| 1704 | c = BYTE8_TO_CHAR (i + 0200); |
| 1705 | i += strlen (p1); |
| 1706 | c2 = BYTE8_TO_CHAR (i + 0200 - 1); |
| 1707 | |
| 1708 | char_ranges[n_char_ranges++] = c; |
| 1709 | char_ranges[n_char_ranges++] = c2; |
| 1710 | leading_code = CHAR_LEADING_CODE (c); |
| 1711 | memset (fastmap + leading_code, 1, |
| 1712 | CHAR_LEADING_CODE (c2) - leading_code + 1); |
| 1713 | } |
| 1714 | } |
| 1715 | } |
| 1716 | else /* STRING is multibyte */ |
| 1717 | { |
| 1718 | char_ranges = alloca (sizeof *char_ranges * SCHARS (string) * 2); |
| 1719 | |
| 1720 | while (i_byte < size_byte) |
| 1721 | { |
| 1722 | int leading_code = str[i_byte]; |
| 1723 | c = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
| 1724 | i_byte += len; |
| 1725 | |
| 1726 | if (handle_iso_classes && c == '[' |
| 1727 | && i_byte < size_byte |
| 1728 | && STRING_CHAR (str + i_byte) == ':') |
| 1729 | { |
| 1730 | const unsigned char *class_beg = str + i_byte + 1; |
| 1731 | const unsigned char *class_end = class_beg; |
| 1732 | const unsigned char *class_limit = str + size_byte - 2; |
| 1733 | /* Leave room for the null. */ |
| 1734 | unsigned char class_name[CHAR_CLASS_MAX_LENGTH + 1]; |
| 1735 | re_wctype_t cc; |
| 1736 | |
| 1737 | if (class_limit - class_beg > CHAR_CLASS_MAX_LENGTH) |
| 1738 | class_limit = class_beg + CHAR_CLASS_MAX_LENGTH; |
| 1739 | |
| 1740 | while (class_end < class_limit |
| 1741 | && *class_end >= 'a' && *class_end <= 'z') |
| 1742 | class_end++; |
| 1743 | |
| 1744 | if (class_end == class_beg |
| 1745 | || *class_end != ':' || class_end[1] != ']') |
| 1746 | goto not_a_class_name_multibyte; |
| 1747 | |
| 1748 | memcpy (class_name, class_beg, class_end - class_beg); |
| 1749 | class_name[class_end - class_beg] = 0; |
| 1750 | |
| 1751 | cc = re_wctype (class_name); |
| 1752 | if (cc == 0) |
| 1753 | error ("Invalid ISO C character class"); |
| 1754 | |
| 1755 | iso_classes = Fcons (make_number (cc), iso_classes); |
| 1756 | |
| 1757 | i_byte = class_end + 2 - str; |
| 1758 | continue; |
| 1759 | } |
| 1760 | |
| 1761 | not_a_class_name_multibyte: |
| 1762 | if (c == '\\') |
| 1763 | { |
| 1764 | if (i_byte == size_byte) |
| 1765 | break; |
| 1766 | |
| 1767 | leading_code = str[i_byte]; |
| 1768 | c = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
| 1769 | i_byte += len; |
| 1770 | } |
| 1771 | /* Treat `-' as range character only if another character |
| 1772 | follows. */ |
| 1773 | if (i_byte + 1 < size_byte |
| 1774 | && str[i_byte] == '-') |
| 1775 | { |
| 1776 | int c2, leading_code2; |
| 1777 | |
| 1778 | /* Skip over the dash. */ |
| 1779 | i_byte++; |
| 1780 | |
| 1781 | /* Get the end of the range. */ |
| 1782 | leading_code2 = str[i_byte]; |
| 1783 | c2 = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
| 1784 | i_byte += len; |
| 1785 | |
| 1786 | if (c2 == '\\' |
| 1787 | && i_byte < size_byte) |
| 1788 | { |
| 1789 | leading_code2 = str[i_byte]; |
| 1790 | c2 = STRING_CHAR_AND_LENGTH (str + i_byte, len); |
| 1791 | i_byte += len; |
| 1792 | } |
| 1793 | |
| 1794 | if (c > c2) |
| 1795 | continue; |
| 1796 | if (ASCII_CHAR_P (c)) |
| 1797 | { |
| 1798 | while (c <= c2 && c < 0x80) |
| 1799 | fastmap[c++] = 1; |
| 1800 | leading_code = CHAR_LEADING_CODE (c); |
| 1801 | } |
| 1802 | if (! ASCII_CHAR_P (c)) |
| 1803 | { |
| 1804 | int lim2 = leading_code2 + 1; |
| 1805 | while (leading_code < lim2) |
| 1806 | fastmap[leading_code++] = 1; |
| 1807 | if (c <= c2) |
| 1808 | { |
| 1809 | char_ranges[n_char_ranges++] = c; |
| 1810 | char_ranges[n_char_ranges++] = c2; |
| 1811 | } |
| 1812 | } |
| 1813 | } |
| 1814 | else |
| 1815 | { |
| 1816 | if (ASCII_CHAR_P (c)) |
| 1817 | fastmap[c] = 1; |
| 1818 | else |
| 1819 | { |
| 1820 | fastmap[leading_code] = 1; |
| 1821 | char_ranges[n_char_ranges++] = c; |
| 1822 | char_ranges[n_char_ranges++] = c; |
| 1823 | } |
| 1824 | } |
| 1825 | } |
| 1826 | |
| 1827 | /* If the current range is unibyte and STRING contains non-ASCII |
| 1828 | chars, arrange fastmap for the corresponding unibyte |
| 1829 | chars. */ |
| 1830 | |
| 1831 | if (! multibyte && n_char_ranges > 0) |
| 1832 | { |
| 1833 | memset (fastmap + 0200, 0, 0200); |
| 1834 | for (i = 0; i < n_char_ranges; i += 2) |
| 1835 | { |
| 1836 | int c1 = char_ranges[i]; |
| 1837 | int lim2 = char_ranges[i + 1] + 1; |
| 1838 | |
| 1839 | for (; c1 < lim2; c1++) |
| 1840 | { |
| 1841 | int b = CHAR_TO_BYTE_SAFE (c1); |
| 1842 | if (b >= 0) |
| 1843 | fastmap[b] = 1; |
| 1844 | } |
| 1845 | } |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | /* If ^ was the first character, complement the fastmap. */ |
| 1850 | if (negate) |
| 1851 | { |
| 1852 | if (! multibyte) |
| 1853 | for (i = 0; i < sizeof fastmap; i++) |
| 1854 | fastmap[i] ^= 1; |
| 1855 | else |
| 1856 | { |
| 1857 | for (i = 0; i < 0200; i++) |
| 1858 | fastmap[i] ^= 1; |
| 1859 | /* All non-ASCII chars possibly match. */ |
| 1860 | for (; i < sizeof fastmap; i++) |
| 1861 | fastmap[i] = 1; |
| 1862 | } |
| 1863 | } |
| 1864 | |
| 1865 | { |
| 1866 | ptrdiff_t start_point = PT; |
| 1867 | ptrdiff_t pos = PT; |
| 1868 | ptrdiff_t pos_byte = PT_BYTE; |
| 1869 | unsigned char *p = PT_ADDR, *endp, *stop; |
| 1870 | |
| 1871 | if (forwardp) |
| 1872 | { |
| 1873 | endp = (XINT (lim) == GPT) ? GPT_ADDR : CHAR_POS_ADDR (XINT (lim)); |
| 1874 | stop = (pos < GPT && GPT < XINT (lim)) ? GPT_ADDR : endp; |
| 1875 | } |
| 1876 | else |
| 1877 | { |
| 1878 | endp = CHAR_POS_ADDR (XINT (lim)); |
| 1879 | stop = (pos >= GPT && GPT > XINT (lim)) ? GAP_END_ADDR : endp; |
| 1880 | } |
| 1881 | |
| 1882 | immediate_quit = 1; |
| 1883 | /* This code may look up syntax tables using functions that rely on the |
| 1884 | gl_state object. To make sure this object is not out of date, |
| 1885 | let's initialize it manually. |
| 1886 | We ignore syntax-table text-properties for now, since that's |
| 1887 | what we've done in the past. */ |
| 1888 | SETUP_BUFFER_SYNTAX_TABLE (); |
| 1889 | if (forwardp) |
| 1890 | { |
| 1891 | if (multibyte) |
| 1892 | while (1) |
| 1893 | { |
| 1894 | int nbytes; |
| 1895 | |
| 1896 | if (p >= stop) |
| 1897 | { |
| 1898 | if (p >= endp) |
| 1899 | break; |
| 1900 | p = GAP_END_ADDR; |
| 1901 | stop = endp; |
| 1902 | } |
| 1903 | c = STRING_CHAR_AND_LENGTH (p, nbytes); |
| 1904 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) |
| 1905 | { |
| 1906 | if (negate) |
| 1907 | break; |
| 1908 | else |
| 1909 | goto fwd_ok; |
| 1910 | } |
| 1911 | |
| 1912 | if (! fastmap[*p]) |
| 1913 | break; |
| 1914 | if (! ASCII_CHAR_P (c)) |
| 1915 | { |
| 1916 | /* As we are looking at a multibyte character, we |
| 1917 | must look up the character in the table |
| 1918 | CHAR_RANGES. If there's no data in the table, |
| 1919 | that character is not what we want to skip. */ |
| 1920 | |
| 1921 | /* The following code do the right thing even if |
| 1922 | n_char_ranges is zero (i.e. no data in |
| 1923 | CHAR_RANGES). */ |
| 1924 | for (i = 0; i < n_char_ranges; i += 2) |
| 1925 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) |
| 1926 | break; |
| 1927 | if (!(negate ^ (i < n_char_ranges))) |
| 1928 | break; |
| 1929 | } |
| 1930 | fwd_ok: |
| 1931 | p += nbytes, pos++, pos_byte += nbytes; |
| 1932 | } |
| 1933 | else |
| 1934 | while (1) |
| 1935 | { |
| 1936 | if (p >= stop) |
| 1937 | { |
| 1938 | if (p >= endp) |
| 1939 | break; |
| 1940 | p = GAP_END_ADDR; |
| 1941 | stop = endp; |
| 1942 | } |
| 1943 | |
| 1944 | if (!NILP (iso_classes) && in_classes (*p, iso_classes)) |
| 1945 | { |
| 1946 | if (negate) |
| 1947 | break; |
| 1948 | else |
| 1949 | goto fwd_unibyte_ok; |
| 1950 | } |
| 1951 | |
| 1952 | if (!fastmap[*p]) |
| 1953 | break; |
| 1954 | fwd_unibyte_ok: |
| 1955 | p++, pos++, pos_byte++; |
| 1956 | } |
| 1957 | } |
| 1958 | else |
| 1959 | { |
| 1960 | if (multibyte) |
| 1961 | while (1) |
| 1962 | { |
| 1963 | unsigned char *prev_p; |
| 1964 | |
| 1965 | if (p <= stop) |
| 1966 | { |
| 1967 | if (p <= endp) |
| 1968 | break; |
| 1969 | p = GPT_ADDR; |
| 1970 | stop = endp; |
| 1971 | } |
| 1972 | prev_p = p; |
| 1973 | while (--p >= stop && ! CHAR_HEAD_P (*p)); |
| 1974 | c = STRING_CHAR (p); |
| 1975 | |
| 1976 | if (! NILP (iso_classes) && in_classes (c, iso_classes)) |
| 1977 | { |
| 1978 | if (negate) |
| 1979 | break; |
| 1980 | else |
| 1981 | goto back_ok; |
| 1982 | } |
| 1983 | |
| 1984 | if (! fastmap[*p]) |
| 1985 | break; |
| 1986 | if (! ASCII_CHAR_P (c)) |
| 1987 | { |
| 1988 | /* See the comment in the previous similar code. */ |
| 1989 | for (i = 0; i < n_char_ranges; i += 2) |
| 1990 | if (c >= char_ranges[i] && c <= char_ranges[i + 1]) |
| 1991 | break; |
| 1992 | if (!(negate ^ (i < n_char_ranges))) |
| 1993 | break; |
| 1994 | } |
| 1995 | back_ok: |
| 1996 | pos--, pos_byte -= prev_p - p; |
| 1997 | } |
| 1998 | else |
| 1999 | while (1) |
| 2000 | { |
| 2001 | if (p <= stop) |
| 2002 | { |
| 2003 | if (p <= endp) |
| 2004 | break; |
| 2005 | p = GPT_ADDR; |
| 2006 | stop = endp; |
| 2007 | } |
| 2008 | |
| 2009 | if (! NILP (iso_classes) && in_classes (p[-1], iso_classes)) |
| 2010 | { |
| 2011 | if (negate) |
| 2012 | break; |
| 2013 | else |
| 2014 | goto back_unibyte_ok; |
| 2015 | } |
| 2016 | |
| 2017 | if (!fastmap[p[-1]]) |
| 2018 | break; |
| 2019 | back_unibyte_ok: |
| 2020 | p--, pos--, pos_byte--; |
| 2021 | } |
| 2022 | } |
| 2023 | |
| 2024 | SET_PT_BOTH (pos, pos_byte); |
| 2025 | immediate_quit = 0; |
| 2026 | |
| 2027 | return make_number (PT - start_point); |
| 2028 | } |
| 2029 | } |
| 2030 | |
| 2031 | |
| 2032 | static Lisp_Object |
| 2033 | skip_syntaxes (bool forwardp, Lisp_Object string, Lisp_Object lim) |
| 2034 | { |
| 2035 | int c; |
| 2036 | unsigned char fastmap[0400]; |
| 2037 | bool negate = 0; |
| 2038 | ptrdiff_t i, i_byte; |
| 2039 | bool multibyte; |
| 2040 | ptrdiff_t size_byte; |
| 2041 | unsigned char *str; |
| 2042 | |
| 2043 | CHECK_STRING (string); |
| 2044 | |
| 2045 | if (NILP (lim)) |
| 2046 | XSETINT (lim, forwardp ? ZV : BEGV); |
| 2047 | else |
| 2048 | CHECK_NUMBER_COERCE_MARKER (lim); |
| 2049 | |
| 2050 | /* In any case, don't allow scan outside bounds of buffer. */ |
| 2051 | if (XINT (lim) > ZV) |
| 2052 | XSETFASTINT (lim, ZV); |
| 2053 | if (XINT (lim) < BEGV) |
| 2054 | XSETFASTINT (lim, BEGV); |
| 2055 | |
| 2056 | if (forwardp ? (PT >= XFASTINT (lim)) : (PT <= XFASTINT (lim))) |
| 2057 | return make_number (0); |
| 2058 | |
| 2059 | multibyte = (!NILP (BVAR (current_buffer, enable_multibyte_characters)) |
| 2060 | && (XINT (lim) - PT != CHAR_TO_BYTE (XINT (lim)) - PT_BYTE)); |
| 2061 | |
| 2062 | memset (fastmap, 0, sizeof fastmap); |
| 2063 | |
| 2064 | if (SBYTES (string) > SCHARS (string)) |
| 2065 | /* As this is very rare case (syntax spec is ASCII only), don't |
| 2066 | consider efficiency. */ |
| 2067 | string = string_make_unibyte (string); |
| 2068 | |
| 2069 | str = SDATA (string); |
| 2070 | size_byte = SBYTES (string); |
| 2071 | |
| 2072 | i_byte = 0; |
| 2073 | if (i_byte < size_byte |
| 2074 | && SREF (string, 0) == '^') |
| 2075 | { |
| 2076 | negate = 1; i_byte++; |
| 2077 | } |
| 2078 | |
| 2079 | /* Find the syntaxes specified and set their elements of fastmap. */ |
| 2080 | |
| 2081 | while (i_byte < size_byte) |
| 2082 | { |
| 2083 | c = str[i_byte++]; |
| 2084 | fastmap[syntax_spec_code[c]] = 1; |
| 2085 | } |
| 2086 | |
| 2087 | /* If ^ was the first character, complement the fastmap. */ |
| 2088 | if (negate) |
| 2089 | for (i = 0; i < sizeof fastmap; i++) |
| 2090 | fastmap[i] ^= 1; |
| 2091 | |
| 2092 | { |
| 2093 | ptrdiff_t start_point = PT; |
| 2094 | ptrdiff_t pos = PT; |
| 2095 | ptrdiff_t pos_byte = PT_BYTE; |
| 2096 | unsigned char *p = PT_ADDR, *endp, *stop; |
| 2097 | |
| 2098 | if (forwardp) |
| 2099 | { |
| 2100 | endp = (XINT (lim) == GPT) ? GPT_ADDR : CHAR_POS_ADDR (XINT (lim)); |
| 2101 | stop = (pos < GPT && GPT < XINT (lim)) ? GPT_ADDR : endp; |
| 2102 | } |
| 2103 | else |
| 2104 | { |
| 2105 | endp = CHAR_POS_ADDR (XINT (lim)); |
| 2106 | stop = (pos >= GPT && GPT > XINT (lim)) ? GAP_END_ADDR : endp; |
| 2107 | } |
| 2108 | |
| 2109 | immediate_quit = 1; |
| 2110 | SETUP_SYNTAX_TABLE (pos, forwardp ? 1 : -1); |
| 2111 | if (forwardp) |
| 2112 | { |
| 2113 | if (multibyte) |
| 2114 | { |
| 2115 | while (1) |
| 2116 | { |
| 2117 | int nbytes; |
| 2118 | |
| 2119 | if (p >= stop) |
| 2120 | { |
| 2121 | if (p >= endp) |
| 2122 | break; |
| 2123 | p = GAP_END_ADDR; |
| 2124 | stop = endp; |
| 2125 | } |
| 2126 | c = STRING_CHAR_AND_LENGTH (p, nbytes); |
| 2127 | if (! fastmap[SYNTAX (c)]) |
| 2128 | break; |
| 2129 | p += nbytes, pos++, pos_byte += nbytes; |
| 2130 | UPDATE_SYNTAX_TABLE_FORWARD (pos); |
| 2131 | } |
| 2132 | } |
| 2133 | else |
| 2134 | { |
| 2135 | while (1) |
| 2136 | { |
| 2137 | if (p >= stop) |
| 2138 | { |
| 2139 | if (p >= endp) |
| 2140 | break; |
| 2141 | p = GAP_END_ADDR; |
| 2142 | stop = endp; |
| 2143 | } |
| 2144 | if (! fastmap[SYNTAX (*p)]) |
| 2145 | break; |
| 2146 | p++, pos++, pos_byte++; |
| 2147 | UPDATE_SYNTAX_TABLE_FORWARD (pos); |
| 2148 | } |
| 2149 | } |
| 2150 | } |
| 2151 | else |
| 2152 | { |
| 2153 | if (multibyte) |
| 2154 | { |
| 2155 | while (1) |
| 2156 | { |
| 2157 | unsigned char *prev_p; |
| 2158 | |
| 2159 | if (p <= stop) |
| 2160 | { |
| 2161 | if (p <= endp) |
| 2162 | break; |
| 2163 | p = GPT_ADDR; |
| 2164 | stop = endp; |
| 2165 | } |
| 2166 | UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1); |
| 2167 | prev_p = p; |
| 2168 | while (--p >= stop && ! CHAR_HEAD_P (*p)); |
| 2169 | c = STRING_CHAR (p); |
| 2170 | if (! fastmap[SYNTAX (c)]) |
| 2171 | break; |
| 2172 | pos--, pos_byte -= prev_p - p; |
| 2173 | } |
| 2174 | } |
| 2175 | else |
| 2176 | { |
| 2177 | while (1) |
| 2178 | { |
| 2179 | if (p <= stop) |
| 2180 | { |
| 2181 | if (p <= endp) |
| 2182 | break; |
| 2183 | p = GPT_ADDR; |
| 2184 | stop = endp; |
| 2185 | } |
| 2186 | UPDATE_SYNTAX_TABLE_BACKWARD (pos - 1); |
| 2187 | if (! fastmap[SYNTAX (p[-1])]) |
| 2188 | break; |
| 2189 | p--, pos--, pos_byte--; |
| 2190 | } |
| 2191 | } |
| 2192 | } |
| 2193 | |
| 2194 | SET_PT_BOTH (pos, pos_byte); |
| 2195 | immediate_quit = 0; |
| 2196 | |
| 2197 | return make_number (PT - start_point); |
| 2198 | } |
| 2199 | } |
| 2200 | |
| 2201 | /* Return true if character C belongs to one of the ISO classes |
| 2202 | in the list ISO_CLASSES. Each class is represented by an |
| 2203 | integer which is its type according to re_wctype. */ |
| 2204 | |
| 2205 | static bool |
| 2206 | in_classes (int c, Lisp_Object iso_classes) |
| 2207 | { |
| 2208 | bool fits_class = 0; |
| 2209 | |
| 2210 | while (CONSP (iso_classes)) |
| 2211 | { |
| 2212 | Lisp_Object elt; |
| 2213 | elt = XCAR (iso_classes); |
| 2214 | iso_classes = XCDR (iso_classes); |
| 2215 | |
| 2216 | if (re_iswctype (c, XFASTINT (elt))) |
| 2217 | fits_class = 1; |
| 2218 | } |
| 2219 | |
| 2220 | return fits_class; |
| 2221 | } |
| 2222 | \f |
| 2223 | /* Jump over a comment, assuming we are at the beginning of one. |
| 2224 | FROM is the current position. |
| 2225 | FROM_BYTE is the bytepos corresponding to FROM. |
| 2226 | Do not move past STOP (a charpos). |
| 2227 | The comment over which we have to jump is of style STYLE |
| 2228 | (either SYNTAX_FLAGS_COMMENT_STYLE (foo) or ST_COMMENT_STYLE). |
| 2229 | NESTING should be positive to indicate the nesting at the beginning |
| 2230 | for nested comments and should be zero or negative else. |
| 2231 | ST_COMMENT_STYLE cannot be nested. |
| 2232 | PREV_SYNTAX is the SYNTAX_WITH_FLAGS of the previous character |
| 2233 | (or 0 If the search cannot start in the middle of a two-character). |
| 2234 | |
| 2235 | If successful, return true and store the charpos of the comment's end |
| 2236 | into *CHARPOS_PTR and the corresponding bytepos into *BYTEPOS_PTR. |
| 2237 | Else, return false and store the charpos STOP into *CHARPOS_PTR, the |
| 2238 | corresponding bytepos into *BYTEPOS_PTR and the current nesting |
| 2239 | (as defined for state.incomment) in *INCOMMENT_PTR. |
| 2240 | |
| 2241 | The comment end is the last character of the comment rather than the |
| 2242 | character just after the comment. |
| 2243 | |
| 2244 | Global syntax data is assumed to initially be valid for FROM and |
| 2245 | remains valid for forward search starting at the returned position. */ |
| 2246 | |
| 2247 | static bool |
| 2248 | forw_comment (ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t stop, |
| 2249 | EMACS_INT nesting, int style, int prev_syntax, |
| 2250 | ptrdiff_t *charpos_ptr, ptrdiff_t *bytepos_ptr, |
| 2251 | EMACS_INT *incomment_ptr) |
| 2252 | { |
| 2253 | register int c, c1; |
| 2254 | register enum syntaxcode code; |
| 2255 | register int syntax, other_syntax; |
| 2256 | |
| 2257 | if (nesting <= 0) nesting = -1; |
| 2258 | |
| 2259 | /* Enter the loop in the middle so that we find |
| 2260 | a 2-char comment ender if we start in the middle of it. */ |
| 2261 | syntax = prev_syntax; |
| 2262 | if (syntax != 0) goto forw_incomment; |
| 2263 | |
| 2264 | while (1) |
| 2265 | { |
| 2266 | if (from == stop) |
| 2267 | { |
| 2268 | *incomment_ptr = nesting; |
| 2269 | *charpos_ptr = from; |
| 2270 | *bytepos_ptr = from_byte; |
| 2271 | return 0; |
| 2272 | } |
| 2273 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2274 | syntax = SYNTAX_WITH_FLAGS (c); |
| 2275 | code = syntax & 0xff; |
| 2276 | if (code == Sendcomment |
| 2277 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == style |
| 2278 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) ? |
| 2279 | (nesting > 0 && --nesting == 0) : nesting < 0)) |
| 2280 | /* we have encountered a comment end of the same style |
| 2281 | as the comment sequence which began this comment |
| 2282 | section */ |
| 2283 | break; |
| 2284 | if (code == Scomment_fence |
| 2285 | && style == ST_COMMENT_STYLE) |
| 2286 | /* we have encountered a comment end of the same style |
| 2287 | as the comment sequence which began this comment |
| 2288 | section. */ |
| 2289 | break; |
| 2290 | if (nesting > 0 |
| 2291 | && code == Scomment |
| 2292 | && SYNTAX_FLAGS_COMMENT_NESTED (syntax) |
| 2293 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0) == style) |
| 2294 | /* we have encountered a nested comment of the same style |
| 2295 | as the comment sequence which began this comment section */ |
| 2296 | nesting++; |
| 2297 | INC_BOTH (from, from_byte); |
| 2298 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2299 | |
| 2300 | forw_incomment: |
| 2301 | if (from < stop && SYNTAX_FLAGS_COMEND_FIRST (syntax) |
| 2302 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
| 2303 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
| 2304 | SYNTAX_FLAGS_COMEND_SECOND (other_syntax)) |
| 2305 | && SYNTAX_FLAGS_COMMENT_STYLE (syntax, other_syntax) == style |
| 2306 | && ((SYNTAX_FLAGS_COMMENT_NESTED (syntax) || |
| 2307 | SYNTAX_FLAGS_COMMENT_NESTED (other_syntax)) |
| 2308 | ? nesting > 0 : nesting < 0)) |
| 2309 | { |
| 2310 | if (--nesting <= 0) |
| 2311 | /* we have encountered a comment end of the same style |
| 2312 | as the comment sequence which began this comment |
| 2313 | section */ |
| 2314 | break; |
| 2315 | else |
| 2316 | { |
| 2317 | INC_BOTH (from, from_byte); |
| 2318 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2319 | } |
| 2320 | } |
| 2321 | if (nesting > 0 |
| 2322 | && from < stop |
| 2323 | && SYNTAX_FLAGS_COMSTART_FIRST (syntax) |
| 2324 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
| 2325 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
| 2326 | SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax) == style |
| 2327 | && SYNTAX_FLAGS_COMSTART_SECOND (other_syntax)) |
| 2328 | && (SYNTAX_FLAGS_COMMENT_NESTED (syntax) || |
| 2329 | SYNTAX_FLAGS_COMMENT_NESTED (other_syntax))) |
| 2330 | /* we have encountered a nested comment of the same style |
| 2331 | as the comment sequence which began this comment |
| 2332 | section */ |
| 2333 | { |
| 2334 | INC_BOTH (from, from_byte); |
| 2335 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2336 | nesting++; |
| 2337 | } |
| 2338 | } |
| 2339 | *charpos_ptr = from; |
| 2340 | *bytepos_ptr = from_byte; |
| 2341 | return 1; |
| 2342 | } |
| 2343 | |
| 2344 | DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 1, 0, |
| 2345 | doc: /* |
| 2346 | Move forward across up to COUNT comments. If COUNT is negative, move backward. |
| 2347 | Stop scanning if we find something other than a comment or whitespace. |
| 2348 | Set point to where scanning stops. |
| 2349 | If COUNT comments are found as expected, with nothing except whitespace |
| 2350 | between them, return t; otherwise return nil. */) |
| 2351 | (Lisp_Object count) |
| 2352 | { |
| 2353 | ptrdiff_t from, from_byte, stop; |
| 2354 | int c, c1; |
| 2355 | enum syntaxcode code; |
| 2356 | int comstyle = 0; /* style of comment encountered */ |
| 2357 | bool comnested = 0; /* whether the comment is nestable or not */ |
| 2358 | bool found; |
| 2359 | EMACS_INT count1; |
| 2360 | ptrdiff_t out_charpos, out_bytepos; |
| 2361 | EMACS_INT dummy; |
| 2362 | |
| 2363 | CHECK_NUMBER (count); |
| 2364 | count1 = XINT (count); |
| 2365 | stop = count1 > 0 ? ZV : BEGV; |
| 2366 | |
| 2367 | immediate_quit = 1; |
| 2368 | QUIT; |
| 2369 | |
| 2370 | from = PT; |
| 2371 | from_byte = PT_BYTE; |
| 2372 | |
| 2373 | SETUP_SYNTAX_TABLE (from, count1); |
| 2374 | while (count1 > 0) |
| 2375 | { |
| 2376 | do |
| 2377 | { |
| 2378 | bool comstart_first; |
| 2379 | int syntax, other_syntax; |
| 2380 | |
| 2381 | if (from == stop) |
| 2382 | { |
| 2383 | SET_PT_BOTH (from, from_byte); |
| 2384 | immediate_quit = 0; |
| 2385 | return Qnil; |
| 2386 | } |
| 2387 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2388 | syntax = SYNTAX_WITH_FLAGS (c); |
| 2389 | code = SYNTAX (c); |
| 2390 | comstart_first = SYNTAX_FLAGS_COMSTART_FIRST (syntax); |
| 2391 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
| 2392 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
| 2393 | INC_BOTH (from, from_byte); |
| 2394 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2395 | if (from < stop && comstart_first |
| 2396 | && (c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
| 2397 | other_syntax = SYNTAX_WITH_FLAGS (c1), |
| 2398 | SYNTAX_FLAGS_COMSTART_SECOND (other_syntax))) |
| 2399 | { |
| 2400 | /* We have encountered a comment start sequence and we |
| 2401 | are ignoring all text inside comments. We must record |
| 2402 | the comment style this sequence begins so that later, |
| 2403 | only a comment end of the same style actually ends |
| 2404 | the comment section. */ |
| 2405 | code = Scomment; |
| 2406 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
| 2407 | comnested |= SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); |
| 2408 | INC_BOTH (from, from_byte); |
| 2409 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2410 | } |
| 2411 | } |
| 2412 | while (code == Swhitespace || (code == Sendcomment && c == '\n')); |
| 2413 | |
| 2414 | if (code == Scomment_fence) |
| 2415 | comstyle = ST_COMMENT_STYLE; |
| 2416 | else if (code != Scomment) |
| 2417 | { |
| 2418 | immediate_quit = 0; |
| 2419 | DEC_BOTH (from, from_byte); |
| 2420 | SET_PT_BOTH (from, from_byte); |
| 2421 | return Qnil; |
| 2422 | } |
| 2423 | /* We're at the start of a comment. */ |
| 2424 | found = forw_comment (from, from_byte, stop, comnested, comstyle, 0, |
| 2425 | &out_charpos, &out_bytepos, &dummy); |
| 2426 | from = out_charpos; from_byte = out_bytepos; |
| 2427 | if (!found) |
| 2428 | { |
| 2429 | immediate_quit = 0; |
| 2430 | SET_PT_BOTH (from, from_byte); |
| 2431 | return Qnil; |
| 2432 | } |
| 2433 | INC_BOTH (from, from_byte); |
| 2434 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2435 | /* We have skipped one comment. */ |
| 2436 | count1--; |
| 2437 | } |
| 2438 | |
| 2439 | while (count1 < 0) |
| 2440 | { |
| 2441 | while (1) |
| 2442 | { |
| 2443 | bool quoted; |
| 2444 | int syntax; |
| 2445 | |
| 2446 | if (from <= stop) |
| 2447 | { |
| 2448 | SET_PT_BOTH (BEGV, BEGV_BYTE); |
| 2449 | immediate_quit = 0; |
| 2450 | return Qnil; |
| 2451 | } |
| 2452 | |
| 2453 | DEC_BOTH (from, from_byte); |
| 2454 | /* char_quoted does UPDATE_SYNTAX_TABLE_BACKWARD (from). */ |
| 2455 | quoted = char_quoted (from, from_byte); |
| 2456 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2457 | syntax = SYNTAX_WITH_FLAGS (c); |
| 2458 | code = SYNTAX (c); |
| 2459 | comstyle = 0; |
| 2460 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
| 2461 | if (code == Sendcomment) |
| 2462 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
| 2463 | if (from > stop && SYNTAX_FLAGS_COMEND_SECOND (syntax) |
| 2464 | && prev_char_comend_first (from, from_byte) |
| 2465 | && !char_quoted (from - 1, dec_bytepos (from_byte))) |
| 2466 | { |
| 2467 | int other_syntax; |
| 2468 | /* We must record the comment style encountered so that |
| 2469 | later, we can match only the proper comment begin |
| 2470 | sequence of the same style. */ |
| 2471 | DEC_BOTH (from, from_byte); |
| 2472 | code = Sendcomment; |
| 2473 | /* Calling char_quoted, above, set up global syntax position |
| 2474 | at the new value of FROM. */ |
| 2475 | c1 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2476 | other_syntax = SYNTAX_WITH_FLAGS (c1); |
| 2477 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
| 2478 | comnested |= SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); |
| 2479 | } |
| 2480 | |
| 2481 | if (code == Scomment_fence) |
| 2482 | { |
| 2483 | /* Skip until first preceding unquoted comment_fence. */ |
| 2484 | bool fence_found = 0; |
| 2485 | ptrdiff_t ini = from, ini_byte = from_byte; |
| 2486 | |
| 2487 | while (1) |
| 2488 | { |
| 2489 | DEC_BOTH (from, from_byte); |
| 2490 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 2491 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2492 | if (SYNTAX (c) == Scomment_fence |
| 2493 | && !char_quoted (from, from_byte)) |
| 2494 | { |
| 2495 | fence_found = 1; |
| 2496 | break; |
| 2497 | } |
| 2498 | else if (from == stop) |
| 2499 | break; |
| 2500 | } |
| 2501 | if (fence_found == 0) |
| 2502 | { |
| 2503 | from = ini; /* Set point to ini + 1. */ |
| 2504 | from_byte = ini_byte; |
| 2505 | goto leave; |
| 2506 | } |
| 2507 | else |
| 2508 | /* We have skipped one comment. */ |
| 2509 | break; |
| 2510 | } |
| 2511 | else if (code == Sendcomment) |
| 2512 | { |
| 2513 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
| 2514 | &out_charpos, &out_bytepos); |
| 2515 | if (!found) |
| 2516 | { |
| 2517 | if (c == '\n') |
| 2518 | /* This end-of-line is not an end-of-comment. |
| 2519 | Treat it like a whitespace. |
| 2520 | CC-mode (and maybe others) relies on this behavior. */ |
| 2521 | ; |
| 2522 | else |
| 2523 | { |
| 2524 | /* Failure: we should go back to the end of this |
| 2525 | not-quite-endcomment. */ |
| 2526 | if (SYNTAX (c) != code) |
| 2527 | /* It was a two-char Sendcomment. */ |
| 2528 | INC_BOTH (from, from_byte); |
| 2529 | goto leave; |
| 2530 | } |
| 2531 | } |
| 2532 | else |
| 2533 | { |
| 2534 | /* We have skipped one comment. */ |
| 2535 | from = out_charpos, from_byte = out_bytepos; |
| 2536 | break; |
| 2537 | } |
| 2538 | } |
| 2539 | else if (code != Swhitespace || quoted) |
| 2540 | { |
| 2541 | leave: |
| 2542 | immediate_quit = 0; |
| 2543 | INC_BOTH (from, from_byte); |
| 2544 | SET_PT_BOTH (from, from_byte); |
| 2545 | return Qnil; |
| 2546 | } |
| 2547 | } |
| 2548 | |
| 2549 | count1++; |
| 2550 | } |
| 2551 | |
| 2552 | SET_PT_BOTH (from, from_byte); |
| 2553 | immediate_quit = 0; |
| 2554 | return Qt; |
| 2555 | } |
| 2556 | \f |
| 2557 | /* Return syntax code of character C if C is an ASCII character |
| 2558 | or if MULTIBYTE_SYMBOL_P is false. Otherwise, return Ssymbol. */ |
| 2559 | |
| 2560 | static enum syntaxcode |
| 2561 | syntax_multibyte (int c, bool multibyte_symbol_p) |
| 2562 | { |
| 2563 | return ASCII_CHAR_P (c) || !multibyte_symbol_p ? SYNTAX (c) : Ssymbol; |
| 2564 | } |
| 2565 | |
| 2566 | static Lisp_Object |
| 2567 | scan_lists (EMACS_INT from, EMACS_INT count, EMACS_INT depth, bool sexpflag) |
| 2568 | { |
| 2569 | Lisp_Object val; |
| 2570 | ptrdiff_t stop = count > 0 ? ZV : BEGV; |
| 2571 | int c, c1; |
| 2572 | int stringterm; |
| 2573 | bool quoted; |
| 2574 | bool mathexit = 0; |
| 2575 | enum syntaxcode code; |
| 2576 | EMACS_INT min_depth = depth; /* Err out if depth gets less than this. */ |
| 2577 | int comstyle = 0; /* style of comment encountered */ |
| 2578 | bool comnested = 0; /* whether the comment is nestable or not */ |
| 2579 | ptrdiff_t temp_pos; |
| 2580 | EMACS_INT last_good = from; |
| 2581 | bool found; |
| 2582 | ptrdiff_t from_byte; |
| 2583 | ptrdiff_t out_bytepos, out_charpos; |
| 2584 | EMACS_INT dummy; |
| 2585 | bool multibyte_symbol_p = sexpflag && multibyte_syntax_as_symbol; |
| 2586 | |
| 2587 | if (depth > 0) min_depth = 0; |
| 2588 | |
| 2589 | if (from > ZV) from = ZV; |
| 2590 | if (from < BEGV) from = BEGV; |
| 2591 | |
| 2592 | from_byte = CHAR_TO_BYTE (from); |
| 2593 | |
| 2594 | immediate_quit = 1; |
| 2595 | QUIT; |
| 2596 | |
| 2597 | SETUP_SYNTAX_TABLE (from, count); |
| 2598 | while (count > 0) |
| 2599 | { |
| 2600 | while (from < stop) |
| 2601 | { |
| 2602 | bool comstart_first, prefix; |
| 2603 | int syntax, other_syntax; |
| 2604 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2605 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2606 | syntax = SYNTAX_WITH_FLAGS (c); |
| 2607 | code = syntax_multibyte (c, multibyte_symbol_p); |
| 2608 | comstart_first = SYNTAX_FLAGS_COMSTART_FIRST (syntax); |
| 2609 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
| 2610 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
| 2611 | prefix = SYNTAX_FLAGS_PREFIX (syntax); |
| 2612 | if (depth == min_depth) |
| 2613 | last_good = from; |
| 2614 | INC_BOTH (from, from_byte); |
| 2615 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2616 | if (from < stop && comstart_first |
| 2617 | && (c = FETCH_CHAR_AS_MULTIBYTE (from_byte), |
| 2618 | other_syntax = SYNTAX_WITH_FLAGS (c), |
| 2619 | SYNTAX_FLAGS_COMSTART_SECOND (other_syntax)) |
| 2620 | && parse_sexp_ignore_comments) |
| 2621 | { |
| 2622 | /* we have encountered a comment start sequence and we |
| 2623 | are ignoring all text inside comments. We must record |
| 2624 | the comment style this sequence begins so that later, |
| 2625 | only a comment end of the same style actually ends |
| 2626 | the comment section */ |
| 2627 | code = Scomment; |
| 2628 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
| 2629 | comnested |= SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); |
| 2630 | INC_BOTH (from, from_byte); |
| 2631 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2632 | } |
| 2633 | |
| 2634 | if (prefix) |
| 2635 | continue; |
| 2636 | |
| 2637 | switch (code) |
| 2638 | { |
| 2639 | case Sescape: |
| 2640 | case Scharquote: |
| 2641 | if (from == stop) |
| 2642 | goto lose; |
| 2643 | INC_BOTH (from, from_byte); |
| 2644 | /* treat following character as a word constituent */ |
| 2645 | case Sword: |
| 2646 | case Ssymbol: |
| 2647 | if (depth || !sexpflag) break; |
| 2648 | /* This word counts as a sexp; return at end of it. */ |
| 2649 | while (from < stop) |
| 2650 | { |
| 2651 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2652 | |
| 2653 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2654 | switch (syntax_multibyte (c, multibyte_symbol_p)) |
| 2655 | { |
| 2656 | case Scharquote: |
| 2657 | case Sescape: |
| 2658 | INC_BOTH (from, from_byte); |
| 2659 | if (from == stop) |
| 2660 | goto lose; |
| 2661 | break; |
| 2662 | case Sword: |
| 2663 | case Ssymbol: |
| 2664 | case Squote: |
| 2665 | break; |
| 2666 | default: |
| 2667 | goto done; |
| 2668 | } |
| 2669 | INC_BOTH (from, from_byte); |
| 2670 | } |
| 2671 | goto done; |
| 2672 | |
| 2673 | case Scomment_fence: |
| 2674 | comstyle = ST_COMMENT_STYLE; |
| 2675 | /* FALLTHROUGH */ |
| 2676 | case Scomment: |
| 2677 | if (!parse_sexp_ignore_comments) break; |
| 2678 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2679 | found = forw_comment (from, from_byte, stop, |
| 2680 | comnested, comstyle, 0, |
| 2681 | &out_charpos, &out_bytepos, &dummy); |
| 2682 | from = out_charpos, from_byte = out_bytepos; |
| 2683 | if (!found) |
| 2684 | { |
| 2685 | if (depth == 0) |
| 2686 | goto done; |
| 2687 | goto lose; |
| 2688 | } |
| 2689 | INC_BOTH (from, from_byte); |
| 2690 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2691 | break; |
| 2692 | |
| 2693 | case Smath: |
| 2694 | if (!sexpflag) |
| 2695 | break; |
| 2696 | if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (from_byte)) |
| 2697 | { |
| 2698 | INC_BOTH (from, from_byte); |
| 2699 | } |
| 2700 | if (mathexit) |
| 2701 | { |
| 2702 | mathexit = 0; |
| 2703 | goto close1; |
| 2704 | } |
| 2705 | mathexit = 1; |
| 2706 | |
| 2707 | case Sopen: |
| 2708 | if (!++depth) goto done; |
| 2709 | break; |
| 2710 | |
| 2711 | case Sclose: |
| 2712 | close1: |
| 2713 | if (!--depth) goto done; |
| 2714 | if (depth < min_depth) |
| 2715 | xsignal3 (Qscan_error, |
| 2716 | build_string ("Containing expression ends prematurely"), |
| 2717 | make_number (last_good), make_number (from)); |
| 2718 | break; |
| 2719 | |
| 2720 | case Sstring: |
| 2721 | case Sstring_fence: |
| 2722 | temp_pos = dec_bytepos (from_byte); |
| 2723 | stringterm = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
| 2724 | while (1) |
| 2725 | { |
| 2726 | enum syntaxcode c_code; |
| 2727 | if (from >= stop) |
| 2728 | goto lose; |
| 2729 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 2730 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2731 | c_code = syntax_multibyte (c, multibyte_symbol_p); |
| 2732 | if (code == Sstring |
| 2733 | ? c == stringterm && c_code == Sstring |
| 2734 | : c_code == Sstring_fence) |
| 2735 | break; |
| 2736 | |
| 2737 | switch (c_code) |
| 2738 | { |
| 2739 | case Scharquote: |
| 2740 | case Sescape: |
| 2741 | INC_BOTH (from, from_byte); |
| 2742 | } |
| 2743 | INC_BOTH (from, from_byte); |
| 2744 | } |
| 2745 | INC_BOTH (from, from_byte); |
| 2746 | if (!depth && sexpflag) goto done; |
| 2747 | break; |
| 2748 | default: |
| 2749 | /* Ignore whitespace, punctuation, quote, endcomment. */ |
| 2750 | break; |
| 2751 | } |
| 2752 | } |
| 2753 | |
| 2754 | /* Reached end of buffer. Error if within object, return nil if between */ |
| 2755 | if (depth) |
| 2756 | goto lose; |
| 2757 | |
| 2758 | immediate_quit = 0; |
| 2759 | return Qnil; |
| 2760 | |
| 2761 | /* End of object reached */ |
| 2762 | done: |
| 2763 | count--; |
| 2764 | } |
| 2765 | |
| 2766 | while (count < 0) |
| 2767 | { |
| 2768 | while (from > stop) |
| 2769 | { |
| 2770 | int syntax; |
| 2771 | DEC_BOTH (from, from_byte); |
| 2772 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 2773 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2774 | syntax= SYNTAX_WITH_FLAGS (c); |
| 2775 | code = syntax_multibyte (c, multibyte_symbol_p); |
| 2776 | if (depth == min_depth) |
| 2777 | last_good = from; |
| 2778 | comstyle = 0; |
| 2779 | comnested = SYNTAX_FLAGS_COMMENT_NESTED (syntax); |
| 2780 | if (code == Sendcomment) |
| 2781 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (syntax, 0); |
| 2782 | if (from > stop && SYNTAX_FLAGS_COMEND_SECOND (syntax) |
| 2783 | && prev_char_comend_first (from, from_byte) |
| 2784 | && parse_sexp_ignore_comments) |
| 2785 | { |
| 2786 | /* We must record the comment style encountered so that |
| 2787 | later, we can match only the proper comment begin |
| 2788 | sequence of the same style. */ |
| 2789 | int c2, other_syntax; |
| 2790 | DEC_BOTH (from, from_byte); |
| 2791 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 2792 | code = Sendcomment; |
| 2793 | c2 = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2794 | other_syntax = SYNTAX_WITH_FLAGS (c2); |
| 2795 | comstyle = SYNTAX_FLAGS_COMMENT_STYLE (other_syntax, syntax); |
| 2796 | comnested |= SYNTAX_FLAGS_COMMENT_NESTED (other_syntax); |
| 2797 | } |
| 2798 | |
| 2799 | /* Quoting turns anything except a comment-ender |
| 2800 | into a word character. Note that this cannot be true |
| 2801 | if we decremented FROM in the if-statement above. */ |
| 2802 | if (code != Sendcomment && char_quoted (from, from_byte)) |
| 2803 | { |
| 2804 | DEC_BOTH (from, from_byte); |
| 2805 | code = Sword; |
| 2806 | } |
| 2807 | else if (SYNTAX_FLAGS_PREFIX (syntax)) |
| 2808 | continue; |
| 2809 | |
| 2810 | switch (code) |
| 2811 | { |
| 2812 | case Sword: |
| 2813 | case Ssymbol: |
| 2814 | case Sescape: |
| 2815 | case Scharquote: |
| 2816 | if (depth || !sexpflag) break; |
| 2817 | /* This word counts as a sexp; count object finished |
| 2818 | after passing it. */ |
| 2819 | while (from > stop) |
| 2820 | { |
| 2821 | temp_pos = from_byte; |
| 2822 | if (! NILP (BVAR (current_buffer, enable_multibyte_characters))) |
| 2823 | DEC_POS (temp_pos); |
| 2824 | else |
| 2825 | temp_pos--; |
| 2826 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
| 2827 | c1 = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
| 2828 | /* Don't allow comment-end to be quoted. */ |
| 2829 | if (syntax_multibyte (c1, multibyte_symbol_p) == Sendcomment) |
| 2830 | goto done2; |
| 2831 | quoted = char_quoted (from - 1, temp_pos); |
| 2832 | if (quoted) |
| 2833 | { |
| 2834 | DEC_BOTH (from, from_byte); |
| 2835 | temp_pos = dec_bytepos (temp_pos); |
| 2836 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
| 2837 | } |
| 2838 | c1 = FETCH_CHAR_AS_MULTIBYTE (temp_pos); |
| 2839 | if (! quoted) |
| 2840 | switch (syntax_multibyte (c1, multibyte_symbol_p)) |
| 2841 | { |
| 2842 | case Sword: case Ssymbol: case Squote: break; |
| 2843 | default: goto done2; |
| 2844 | } |
| 2845 | DEC_BOTH (from, from_byte); |
| 2846 | } |
| 2847 | goto done2; |
| 2848 | |
| 2849 | case Smath: |
| 2850 | if (!sexpflag) |
| 2851 | break; |
| 2852 | temp_pos = dec_bytepos (from_byte); |
| 2853 | UPDATE_SYNTAX_TABLE_BACKWARD (from - 1); |
| 2854 | if (from != stop && c == FETCH_CHAR_AS_MULTIBYTE (temp_pos)) |
| 2855 | DEC_BOTH (from, from_byte); |
| 2856 | if (mathexit) |
| 2857 | { |
| 2858 | mathexit = 0; |
| 2859 | goto open2; |
| 2860 | } |
| 2861 | mathexit = 1; |
| 2862 | |
| 2863 | case Sclose: |
| 2864 | if (!++depth) goto done2; |
| 2865 | break; |
| 2866 | |
| 2867 | case Sopen: |
| 2868 | open2: |
| 2869 | if (!--depth) goto done2; |
| 2870 | if (depth < min_depth) |
| 2871 | xsignal3 (Qscan_error, |
| 2872 | build_string ("Containing expression ends prematurely"), |
| 2873 | make_number (last_good), make_number (from)); |
| 2874 | break; |
| 2875 | |
| 2876 | case Sendcomment: |
| 2877 | if (!parse_sexp_ignore_comments) |
| 2878 | break; |
| 2879 | found = back_comment (from, from_byte, stop, comnested, comstyle, |
| 2880 | &out_charpos, &out_bytepos); |
| 2881 | /* FIXME: if !found, it really wasn't a comment-end. |
| 2882 | For single-char Sendcomment, we can't do much about it apart |
| 2883 | from skipping the char. |
| 2884 | For 2-char endcomments, we could try again, taking both |
| 2885 | chars as separate entities, but it's a lot of trouble |
| 2886 | for very little gain, so we don't bother either. -sm */ |
| 2887 | if (found) |
| 2888 | from = out_charpos, from_byte = out_bytepos; |
| 2889 | break; |
| 2890 | |
| 2891 | case Scomment_fence: |
| 2892 | case Sstring_fence: |
| 2893 | while (1) |
| 2894 | { |
| 2895 | if (from == stop) |
| 2896 | goto lose; |
| 2897 | DEC_BOTH (from, from_byte); |
| 2898 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 2899 | if (!char_quoted (from, from_byte)) |
| 2900 | { |
| 2901 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2902 | if (syntax_multibyte (c, multibyte_symbol_p) == code) |
| 2903 | break; |
| 2904 | } |
| 2905 | } |
| 2906 | if (code == Sstring_fence && !depth && sexpflag) goto done2; |
| 2907 | break; |
| 2908 | |
| 2909 | case Sstring: |
| 2910 | stringterm = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2911 | while (1) |
| 2912 | { |
| 2913 | if (from == stop) |
| 2914 | goto lose; |
| 2915 | DEC_BOTH (from, from_byte); |
| 2916 | UPDATE_SYNTAX_TABLE_BACKWARD (from); |
| 2917 | if (!char_quoted (from, from_byte)) |
| 2918 | { |
| 2919 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 2920 | if (c == stringterm |
| 2921 | && (syntax_multibyte (c, multibyte_symbol_p) |
| 2922 | == Sstring)) |
| 2923 | break; |
| 2924 | } |
| 2925 | } |
| 2926 | if (!depth && sexpflag) goto done2; |
| 2927 | break; |
| 2928 | default: |
| 2929 | /* Ignore whitespace, punctuation, quote, endcomment. */ |
| 2930 | break; |
| 2931 | } |
| 2932 | } |
| 2933 | |
| 2934 | /* Reached start of buffer. Error if within object, return nil if between */ |
| 2935 | if (depth) |
| 2936 | goto lose; |
| 2937 | |
| 2938 | immediate_quit = 0; |
| 2939 | return Qnil; |
| 2940 | |
| 2941 | done2: |
| 2942 | count++; |
| 2943 | } |
| 2944 | |
| 2945 | |
| 2946 | immediate_quit = 0; |
| 2947 | XSETFASTINT (val, from); |
| 2948 | return val; |
| 2949 | |
| 2950 | lose: |
| 2951 | xsignal3 (Qscan_error, |
| 2952 | build_string ("Unbalanced parentheses"), |
| 2953 | make_number (last_good), make_number (from)); |
| 2954 | } |
| 2955 | |
| 2956 | DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0, |
| 2957 | doc: /* Scan from character number FROM by COUNT lists. |
| 2958 | Scan forward if COUNT is positive, backward if COUNT is negative. |
| 2959 | Return the character number of the position thus found. |
| 2960 | |
| 2961 | A \"list", in this context, refers to a balanced parenthetical |
| 2962 | grouping, as determined by the syntax table. |
| 2963 | |
| 2964 | If DEPTH is nonzero, treat that as the nesting depth of the starting |
| 2965 | point (i.e. the starting point is DEPTH parentheses deep). This |
| 2966 | function scans over parentheses until the depth goes to zero COUNT |
| 2967 | times. Hence, positive DEPTH moves out that number of levels of |
| 2968 | parentheses, while negative DEPTH moves to a deeper level. |
| 2969 | |
| 2970 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. |
| 2971 | |
| 2972 | If we reach the beginning or end of the accessible part of the buffer |
| 2973 | before we have scanned over COUNT lists, return nil if the depth at |
| 2974 | that point is zero, and signal a error if the depth is nonzero. */) |
| 2975 | (Lisp_Object from, Lisp_Object count, Lisp_Object depth) |
| 2976 | { |
| 2977 | CHECK_NUMBER (from); |
| 2978 | CHECK_NUMBER (count); |
| 2979 | CHECK_NUMBER (depth); |
| 2980 | |
| 2981 | return scan_lists (XINT (from), XINT (count), XINT (depth), 0); |
| 2982 | } |
| 2983 | |
| 2984 | DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0, |
| 2985 | doc: /* Scan from character number FROM by COUNT balanced expressions. |
| 2986 | If COUNT is negative, scan backwards. |
| 2987 | Returns the character number of the position thus found. |
| 2988 | |
| 2989 | Comments are ignored if `parse-sexp-ignore-comments' is non-nil. |
| 2990 | |
| 2991 | If the beginning or end of (the accessible part of) the buffer is reached |
| 2992 | in the middle of a parenthetical grouping, an error is signaled. |
| 2993 | If the beginning or end is reached between groupings |
| 2994 | but before count is used up, nil is returned. */) |
| 2995 | (Lisp_Object from, Lisp_Object count) |
| 2996 | { |
| 2997 | CHECK_NUMBER (from); |
| 2998 | CHECK_NUMBER (count); |
| 2999 | |
| 3000 | return scan_lists (XINT (from), XINT (count), 0, 1); |
| 3001 | } |
| 3002 | |
| 3003 | DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars, |
| 3004 | 0, 0, 0, |
| 3005 | doc: /* Move point backward over any number of chars with prefix syntax. |
| 3006 | This includes chars with "quote" or "prefix" syntax (' or p). */) |
| 3007 | (void) |
| 3008 | { |
| 3009 | ptrdiff_t beg = BEGV; |
| 3010 | ptrdiff_t opoint = PT; |
| 3011 | ptrdiff_t opoint_byte = PT_BYTE; |
| 3012 | ptrdiff_t pos = PT; |
| 3013 | ptrdiff_t pos_byte = PT_BYTE; |
| 3014 | int c; |
| 3015 | |
| 3016 | if (pos <= beg) |
| 3017 | { |
| 3018 | SET_PT_BOTH (opoint, opoint_byte); |
| 3019 | |
| 3020 | return Qnil; |
| 3021 | } |
| 3022 | |
| 3023 | SETUP_SYNTAX_TABLE (pos, -1); |
| 3024 | |
| 3025 | DEC_BOTH (pos, pos_byte); |
| 3026 | |
| 3027 | while (!char_quoted (pos, pos_byte) |
| 3028 | /* Previous statement updates syntax table. */ |
| 3029 | && ((c = FETCH_CHAR_AS_MULTIBYTE (pos_byte), SYNTAX (c) == Squote) |
| 3030 | || syntax_prefix_flag_p (c))) |
| 3031 | { |
| 3032 | opoint = pos; |
| 3033 | opoint_byte = pos_byte; |
| 3034 | |
| 3035 | if (pos + 1 > beg) |
| 3036 | DEC_BOTH (pos, pos_byte); |
| 3037 | } |
| 3038 | |
| 3039 | SET_PT_BOTH (opoint, opoint_byte); |
| 3040 | |
| 3041 | return Qnil; |
| 3042 | } |
| 3043 | \f |
| 3044 | /* Parse forward from FROM / FROM_BYTE to END, |
| 3045 | assuming that FROM has state OLDSTATE (nil means FROM is start of function), |
| 3046 | and return a description of the state of the parse at END. |
| 3047 | If STOPBEFORE, stop at the start of an atom. |
| 3048 | If COMMENTSTOP is 1, stop at the start of a comment. |
| 3049 | If COMMENTSTOP is -1, stop at the start or end of a comment, |
| 3050 | after the beginning of a string, or after the end of a string. */ |
| 3051 | |
| 3052 | static void |
| 3053 | scan_sexps_forward (struct lisp_parse_state *stateptr, |
| 3054 | ptrdiff_t from, ptrdiff_t from_byte, ptrdiff_t end, |
| 3055 | EMACS_INT targetdepth, bool stopbefore, |
| 3056 | Lisp_Object oldstate, int commentstop) |
| 3057 | { |
| 3058 | struct lisp_parse_state state; |
| 3059 | enum syntaxcode code; |
| 3060 | int c1; |
| 3061 | bool comnested; |
| 3062 | struct level { ptrdiff_t last, prev; }; |
| 3063 | struct level levelstart[100]; |
| 3064 | struct level *curlevel = levelstart; |
| 3065 | struct level *endlevel = levelstart + 100; |
| 3066 | EMACS_INT depth; /* Paren depth of current scanning location. |
| 3067 | level - levelstart equals this except |
| 3068 | when the depth becomes negative. */ |
| 3069 | EMACS_INT mindepth; /* Lowest DEPTH value seen. */ |
| 3070 | bool start_quoted = 0; /* True means starting after a char quote. */ |
| 3071 | Lisp_Object tem; |
| 3072 | ptrdiff_t prev_from; /* Keep one character before FROM. */ |
| 3073 | ptrdiff_t prev_from_byte; |
| 3074 | int prev_from_syntax; |
| 3075 | bool boundary_stop = commentstop == -1; |
| 3076 | bool nofence; |
| 3077 | bool found; |
| 3078 | ptrdiff_t out_bytepos, out_charpos; |
| 3079 | int temp; |
| 3080 | |
| 3081 | prev_from = from; |
| 3082 | prev_from_byte = from_byte; |
| 3083 | if (from != BEGV) |
| 3084 | DEC_BOTH (prev_from, prev_from_byte); |
| 3085 | |
| 3086 | /* Use this macro instead of `from++'. */ |
| 3087 | #define INC_FROM \ |
| 3088 | do { prev_from = from; \ |
| 3089 | prev_from_byte = from_byte; \ |
| 3090 | temp = FETCH_CHAR_AS_MULTIBYTE (prev_from_byte); \ |
| 3091 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); \ |
| 3092 | INC_BOTH (from, from_byte); \ |
| 3093 | if (from < end) \ |
| 3094 | UPDATE_SYNTAX_TABLE_FORWARD (from); \ |
| 3095 | } while (0) |
| 3096 | |
| 3097 | immediate_quit = 1; |
| 3098 | QUIT; |
| 3099 | |
| 3100 | if (NILP (oldstate)) |
| 3101 | { |
| 3102 | depth = 0; |
| 3103 | state.instring = -1; |
| 3104 | state.incomment = 0; |
| 3105 | state.comstyle = 0; /* comment style a by default. */ |
| 3106 | state.comstr_start = -1; /* no comment/string seen. */ |
| 3107 | } |
| 3108 | else |
| 3109 | { |
| 3110 | tem = Fcar (oldstate); |
| 3111 | if (!NILP (tem)) |
| 3112 | depth = XINT (tem); |
| 3113 | else |
| 3114 | depth = 0; |
| 3115 | |
| 3116 | oldstate = Fcdr (oldstate); |
| 3117 | oldstate = Fcdr (oldstate); |
| 3118 | oldstate = Fcdr (oldstate); |
| 3119 | tem = Fcar (oldstate); |
| 3120 | /* Check whether we are inside string_fence-style string: */ |
| 3121 | state.instring = (!NILP (tem) |
| 3122 | ? (CHARACTERP (tem) ? XFASTINT (tem) : ST_STRING_STYLE) |
| 3123 | : -1); |
| 3124 | |
| 3125 | oldstate = Fcdr (oldstate); |
| 3126 | tem = Fcar (oldstate); |
| 3127 | state.incomment = (!NILP (tem) |
| 3128 | ? (INTEGERP (tem) ? XINT (tem) : -1) |
| 3129 | : 0); |
| 3130 | |
| 3131 | oldstate = Fcdr (oldstate); |
| 3132 | tem = Fcar (oldstate); |
| 3133 | start_quoted = !NILP (tem); |
| 3134 | |
| 3135 | /* if the eighth element of the list is nil, we are in comment |
| 3136 | style a. If it is non-nil, we are in comment style b */ |
| 3137 | oldstate = Fcdr (oldstate); |
| 3138 | oldstate = Fcdr (oldstate); |
| 3139 | tem = Fcar (oldstate); |
| 3140 | state.comstyle = (NILP (tem) |
| 3141 | ? 0 |
| 3142 | : (RANGED_INTEGERP (0, tem, ST_COMMENT_STYLE) |
| 3143 | ? XINT (tem) |
| 3144 | : ST_COMMENT_STYLE)); |
| 3145 | |
| 3146 | oldstate = Fcdr (oldstate); |
| 3147 | tem = Fcar (oldstate); |
| 3148 | state.comstr_start = |
| 3149 | RANGED_INTEGERP (PTRDIFF_MIN, tem, PTRDIFF_MAX) ? XINT (tem) : -1; |
| 3150 | oldstate = Fcdr (oldstate); |
| 3151 | tem = Fcar (oldstate); |
| 3152 | while (!NILP (tem)) /* >= second enclosing sexps. */ |
| 3153 | { |
| 3154 | Lisp_Object temhd = Fcar (tem); |
| 3155 | if (RANGED_INTEGERP (PTRDIFF_MIN, temhd, PTRDIFF_MAX)) |
| 3156 | curlevel->last = XINT (temhd); |
| 3157 | if (++curlevel == endlevel) |
| 3158 | curlevel--; /* error ("Nesting too deep for parser"); */ |
| 3159 | curlevel->prev = -1; |
| 3160 | curlevel->last = -1; |
| 3161 | tem = Fcdr (tem); |
| 3162 | } |
| 3163 | } |
| 3164 | state.quoted = 0; |
| 3165 | mindepth = depth; |
| 3166 | |
| 3167 | curlevel->prev = -1; |
| 3168 | curlevel->last = -1; |
| 3169 | |
| 3170 | SETUP_SYNTAX_TABLE (prev_from, 1); |
| 3171 | temp = FETCH_CHAR (prev_from_byte); |
| 3172 | prev_from_syntax = SYNTAX_WITH_FLAGS (temp); |
| 3173 | UPDATE_SYNTAX_TABLE_FORWARD (from); |
| 3174 | |
| 3175 | /* Enter the loop at a place appropriate for initial state. */ |
| 3176 | |
| 3177 | if (state.incomment) |
| 3178 | goto startincomment; |
| 3179 | if (state.instring >= 0) |
| 3180 | { |
| 3181 | nofence = state.instring != ST_STRING_STYLE; |
| 3182 | if (start_quoted) |
| 3183 | goto startquotedinstring; |
| 3184 | goto startinstring; |
| 3185 | } |
| 3186 | else if (start_quoted) |
| 3187 | goto startquoted; |
| 3188 | |
| 3189 | while (from < end) |
| 3190 | { |
| 3191 | int syntax; |
| 3192 | INC_FROM; |
| 3193 | code = prev_from_syntax & 0xff; |
| 3194 | |
| 3195 | if (from < end |
| 3196 | && SYNTAX_FLAGS_COMSTART_FIRST (prev_from_syntax) |
| 3197 | && (c1 = FETCH_CHAR (from_byte), |
| 3198 | syntax = SYNTAX_WITH_FLAGS (c1), |
| 3199 | SYNTAX_FLAGS_COMSTART_SECOND (syntax))) |
| 3200 | /* Duplicate code to avoid a complex if-expression |
| 3201 | which causes trouble for the SGI compiler. */ |
| 3202 | { |
| 3203 | /* Record the comment style we have entered so that only |
| 3204 | the comment-end sequence of the same style actually |
| 3205 | terminates the comment section. */ |
| 3206 | state.comstyle |
| 3207 | = SYNTAX_FLAGS_COMMENT_STYLE (syntax, prev_from_syntax); |
| 3208 | comnested = (SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax) |
| 3209 | | SYNTAX_FLAGS_COMMENT_NESTED (syntax)); |
| 3210 | state.incomment = comnested ? 1 : -1; |
| 3211 | state.comstr_start = prev_from; |
| 3212 | INC_FROM; |
| 3213 | code = Scomment; |
| 3214 | } |
| 3215 | else if (code == Scomment_fence) |
| 3216 | { |
| 3217 | /* Record the comment style we have entered so that only |
| 3218 | the comment-end sequence of the same style actually |
| 3219 | terminates the comment section. */ |
| 3220 | state.comstyle = ST_COMMENT_STYLE; |
| 3221 | state.incomment = -1; |
| 3222 | state.comstr_start = prev_from; |
| 3223 | code = Scomment; |
| 3224 | } |
| 3225 | else if (code == Scomment) |
| 3226 | { |
| 3227 | state.comstyle = SYNTAX_FLAGS_COMMENT_STYLE (prev_from_syntax, 0); |
| 3228 | state.incomment = (SYNTAX_FLAGS_COMMENT_NESTED (prev_from_syntax) ? |
| 3229 | 1 : -1); |
| 3230 | state.comstr_start = prev_from; |
| 3231 | } |
| 3232 | |
| 3233 | if (SYNTAX_FLAGS_PREFIX (prev_from_syntax)) |
| 3234 | continue; |
| 3235 | switch (code) |
| 3236 | { |
| 3237 | case Sescape: |
| 3238 | case Scharquote: |
| 3239 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 3240 | curlevel->last = prev_from; |
| 3241 | startquoted: |
| 3242 | if (from == end) goto endquoted; |
| 3243 | INC_FROM; |
| 3244 | goto symstarted; |
| 3245 | /* treat following character as a word constituent */ |
| 3246 | case Sword: |
| 3247 | case Ssymbol: |
| 3248 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 3249 | curlevel->last = prev_from; |
| 3250 | symstarted: |
| 3251 | while (from < end) |
| 3252 | { |
| 3253 | int symchar = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 3254 | switch (SYNTAX (symchar)) |
| 3255 | { |
| 3256 | case Scharquote: |
| 3257 | case Sescape: |
| 3258 | INC_FROM; |
| 3259 | if (from == end) goto endquoted; |
| 3260 | break; |
| 3261 | case Sword: |
| 3262 | case Ssymbol: |
| 3263 | case Squote: |
| 3264 | break; |
| 3265 | default: |
| 3266 | goto symdone; |
| 3267 | } |
| 3268 | INC_FROM; |
| 3269 | } |
| 3270 | symdone: |
| 3271 | curlevel->prev = curlevel->last; |
| 3272 | break; |
| 3273 | |
| 3274 | case Scomment_fence: /* Can't happen because it's handled above. */ |
| 3275 | case Scomment: |
| 3276 | if (commentstop || boundary_stop) goto done; |
| 3277 | startincomment: |
| 3278 | /* The (from == BEGV) test was to enter the loop in the middle so |
| 3279 | that we find a 2-char comment ender even if we start in the |
| 3280 | middle of it. We don't want to do that if we're just at the |
| 3281 | beginning of the comment (think of (*) ... (*)). */ |
| 3282 | found = forw_comment (from, from_byte, end, |
| 3283 | state.incomment, state.comstyle, |
| 3284 | (from == BEGV || from < state.comstr_start + 3) |
| 3285 | ? 0 : prev_from_syntax, |
| 3286 | &out_charpos, &out_bytepos, &state.incomment); |
| 3287 | from = out_charpos; from_byte = out_bytepos; |
| 3288 | /* Beware! prev_from and friends are invalid now. |
| 3289 | Luckily, the `done' doesn't use them and the INC_FROM |
| 3290 | sets them to a sane value without looking at them. */ |
| 3291 | if (!found) goto done; |
| 3292 | INC_FROM; |
| 3293 | state.incomment = 0; |
| 3294 | state.comstyle = 0; /* reset the comment style */ |
| 3295 | if (boundary_stop) goto done; |
| 3296 | break; |
| 3297 | |
| 3298 | case Sopen: |
| 3299 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 3300 | depth++; |
| 3301 | /* curlevel++->last ran into compiler bug on Apollo */ |
| 3302 | curlevel->last = prev_from; |
| 3303 | if (++curlevel == endlevel) |
| 3304 | curlevel--; /* error ("Nesting too deep for parser"); */ |
| 3305 | curlevel->prev = -1; |
| 3306 | curlevel->last = -1; |
| 3307 | if (targetdepth == depth) goto done; |
| 3308 | break; |
| 3309 | |
| 3310 | case Sclose: |
| 3311 | depth--; |
| 3312 | if (depth < mindepth) |
| 3313 | mindepth = depth; |
| 3314 | if (curlevel != levelstart) |
| 3315 | curlevel--; |
| 3316 | curlevel->prev = curlevel->last; |
| 3317 | if (targetdepth == depth) goto done; |
| 3318 | break; |
| 3319 | |
| 3320 | case Sstring: |
| 3321 | case Sstring_fence: |
| 3322 | state.comstr_start = from - 1; |
| 3323 | if (stopbefore) goto stop; /* this arg means stop at sexp start */ |
| 3324 | curlevel->last = prev_from; |
| 3325 | state.instring = (code == Sstring |
| 3326 | ? (FETCH_CHAR_AS_MULTIBYTE (prev_from_byte)) |
| 3327 | : ST_STRING_STYLE); |
| 3328 | if (boundary_stop) goto done; |
| 3329 | startinstring: |
| 3330 | { |
| 3331 | nofence = state.instring != ST_STRING_STYLE; |
| 3332 | |
| 3333 | while (1) |
| 3334 | { |
| 3335 | int c; |
| 3336 | enum syntaxcode c_code; |
| 3337 | |
| 3338 | if (from >= end) goto done; |
| 3339 | c = FETCH_CHAR_AS_MULTIBYTE (from_byte); |
| 3340 | c_code = SYNTAX (c); |
| 3341 | |
| 3342 | /* Check C_CODE here so that if the char has |
| 3343 | a syntax-table property which says it is NOT |
| 3344 | a string character, it does not end the string. */ |
| 3345 | if (nofence && c == state.instring && c_code == Sstring) |
| 3346 | break; |
| 3347 | |
| 3348 | switch (c_code) |
| 3349 | { |
| 3350 | case Sstring_fence: |
| 3351 | if (!nofence) goto string_end; |
| 3352 | break; |
| 3353 | case Scharquote: |
| 3354 | case Sescape: |
| 3355 | INC_FROM; |
| 3356 | startquotedinstring: |
| 3357 | if (from >= end) goto endquoted; |
| 3358 | } |
| 3359 | INC_FROM; |
| 3360 | } |
| 3361 | } |
| 3362 | string_end: |
| 3363 | state.instring = -1; |
| 3364 | curlevel->prev = curlevel->last; |
| 3365 | INC_FROM; |
| 3366 | if (boundary_stop) goto done; |
| 3367 | break; |
| 3368 | |
| 3369 | case Smath: |
| 3370 | /* FIXME: We should do something with it. */ |
| 3371 | break; |
| 3372 | default: |
| 3373 | /* Ignore whitespace, punctuation, quote, endcomment. */ |
| 3374 | break; |
| 3375 | } |
| 3376 | } |
| 3377 | goto done; |
| 3378 | |
| 3379 | stop: /* Here if stopping before start of sexp. */ |
| 3380 | from = prev_from; /* We have just fetched the char that starts it; */ |
| 3381 | from_byte = prev_from_byte; |
| 3382 | goto done; /* but return the position before it. */ |
| 3383 | |
| 3384 | endquoted: |
| 3385 | state.quoted = 1; |
| 3386 | done: |
| 3387 | state.depth = depth; |
| 3388 | state.mindepth = mindepth; |
| 3389 | state.thislevelstart = curlevel->prev; |
| 3390 | state.prevlevelstart |
| 3391 | = (curlevel == levelstart) ? -1 : (curlevel - 1)->last; |
| 3392 | state.location = from; |
| 3393 | state.location_byte = from_byte; |
| 3394 | state.levelstarts = Qnil; |
| 3395 | while (curlevel > levelstart) |
| 3396 | state.levelstarts = Fcons (make_number ((--curlevel)->last), |
| 3397 | state.levelstarts); |
| 3398 | immediate_quit = 0; |
| 3399 | |
| 3400 | *stateptr = state; |
| 3401 | } |
| 3402 | |
| 3403 | DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 6, 0, |
| 3404 | doc: /* Parse Lisp syntax starting at FROM until TO; return status of parse at TO. |
| 3405 | Parsing stops at TO or when certain criteria are met; |
| 3406 | point is set to where parsing stops. |
| 3407 | If fifth arg OLDSTATE is omitted or nil, |
| 3408 | parsing assumes that FROM is the beginning of a function. |
| 3409 | Value is a list of elements describing final state of parsing: |
| 3410 | 0. depth in parens. |
| 3411 | 1. character address of start of innermost containing list; nil if none. |
| 3412 | 2. character address of start of last complete sexp terminated. |
| 3413 | 3. non-nil if inside a string. |
| 3414 | (it is the character that will terminate the string, |
| 3415 | or t if the string should be terminated by a generic string delimiter.) |
| 3416 | 4. nil if outside a comment, t if inside a non-nestable comment, |
| 3417 | else an integer (the current comment nesting). |
| 3418 | 5. t if following a quote character. |
| 3419 | 6. the minimum paren-depth encountered during this scan. |
| 3420 | 7. style of comment, if any. |
| 3421 | 8. character address of start of comment or string; nil if not in one. |
| 3422 | 9. Intermediate data for continuation of parsing (subject to change). |
| 3423 | If third arg TARGETDEPTH is non-nil, parsing stops if the depth |
| 3424 | in parentheses becomes equal to TARGETDEPTH. |
| 3425 | Fourth arg STOPBEFORE non-nil means stop when come to |
| 3426 | any character that starts a sexp. |
| 3427 | Fifth arg OLDSTATE is a list like what this function returns. |
| 3428 | It is used to initialize the state of the parse. Elements number 1, 2, 6 |
| 3429 | are ignored. |
| 3430 | Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. |
| 3431 | If it is symbol `syntax-table', stop after the start of a comment or a |
| 3432 | string, or after end of a comment or a string. */) |
| 3433 | (Lisp_Object from, Lisp_Object to, Lisp_Object targetdepth, |
| 3434 | Lisp_Object stopbefore, Lisp_Object oldstate, Lisp_Object commentstop) |
| 3435 | { |
| 3436 | struct lisp_parse_state state; |
| 3437 | EMACS_INT target; |
| 3438 | |
| 3439 | if (!NILP (targetdepth)) |
| 3440 | { |
| 3441 | CHECK_NUMBER (targetdepth); |
| 3442 | target = XINT (targetdepth); |
| 3443 | } |
| 3444 | else |
| 3445 | target = TYPE_MINIMUM (EMACS_INT); /* We won't reach this depth */ |
| 3446 | |
| 3447 | validate_region (&from, &to); |
| 3448 | scan_sexps_forward (&state, XINT (from), CHAR_TO_BYTE (XINT (from)), |
| 3449 | XINT (to), |
| 3450 | target, !NILP (stopbefore), oldstate, |
| 3451 | (NILP (commentstop) |
| 3452 | ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1))); |
| 3453 | |
| 3454 | SET_PT_BOTH (state.location, state.location_byte); |
| 3455 | |
| 3456 | return Fcons (make_number (state.depth), |
| 3457 | Fcons (state.prevlevelstart < 0 |
| 3458 | ? Qnil : make_number (state.prevlevelstart), |
| 3459 | Fcons (state.thislevelstart < 0 |
| 3460 | ? Qnil : make_number (state.thislevelstart), |
| 3461 | Fcons (state.instring >= 0 |
| 3462 | ? (state.instring == ST_STRING_STYLE |
| 3463 | ? Qt : make_number (state.instring)) : Qnil, |
| 3464 | Fcons (state.incomment < 0 ? Qt : |
| 3465 | (state.incomment == 0 ? Qnil : |
| 3466 | make_number (state.incomment)), |
| 3467 | Fcons (state.quoted ? Qt : Qnil, |
| 3468 | Fcons (make_number (state.mindepth), |
| 3469 | Fcons ((state.comstyle |
| 3470 | ? (state.comstyle == ST_COMMENT_STYLE |
| 3471 | ? Qsyntax_table |
| 3472 | : make_number (state.comstyle)) |
| 3473 | : Qnil), |
| 3474 | Fcons (((state.incomment |
| 3475 | || (state.instring >= 0)) |
| 3476 | ? make_number (state.comstr_start) |
| 3477 | : Qnil), |
| 3478 | Fcons (state.levelstarts, Qnil)))))))))); |
| 3479 | } |
| 3480 | \f |
| 3481 | void |
| 3482 | init_syntax_once (void) |
| 3483 | { |
| 3484 | register int i, c; |
| 3485 | Lisp_Object temp; |
| 3486 | |
| 3487 | /* This has to be done here, before we call Fmake_char_table. */ |
| 3488 | DEFSYM (Qsyntax_table, "syntax-table"); |
| 3489 | |
| 3490 | /* This variable is DEFSYMed in alloc.c and not initialized yet, so |
| 3491 | intern it here. NOTE: you must guarantee that init_syntax_once |
| 3492 | is called before all other users of this variable. */ |
| 3493 | Qchar_table_extra_slots = intern_c_string ("char-table-extra-slots"); |
| 3494 | |
| 3495 | /* Create objects which can be shared among syntax tables. */ |
| 3496 | Vsyntax_code_object = make_uninit_vector (Smax); |
| 3497 | for (i = 0; i < Smax; i++) |
| 3498 | ASET (Vsyntax_code_object, i, Fcons (make_number (i), Qnil)); |
| 3499 | |
| 3500 | /* Now we are ready to set up this property, so we can |
| 3501 | create syntax tables. */ |
| 3502 | Fput (Qsyntax_table, Qchar_table_extra_slots, make_number (0)); |
| 3503 | |
| 3504 | temp = AREF (Vsyntax_code_object, Swhitespace); |
| 3505 | |
| 3506 | Vstandard_syntax_table = Fmake_char_table (Qsyntax_table, temp); |
| 3507 | |
| 3508 | /* Control characters should not be whitespace. */ |
| 3509 | temp = AREF (Vsyntax_code_object, Spunct); |
| 3510 | for (i = 0; i <= ' ' - 1; i++) |
| 3511 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
| 3512 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 0177, temp); |
| 3513 | |
| 3514 | /* Except that a few really are whitespace. */ |
| 3515 | temp = AREF (Vsyntax_code_object, Swhitespace); |
| 3516 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ' ', temp); |
| 3517 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\t', temp); |
| 3518 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\n', temp); |
| 3519 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 015, temp); |
| 3520 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, 014, temp); |
| 3521 | |
| 3522 | temp = AREF (Vsyntax_code_object, Sword); |
| 3523 | for (i = 'a'; i <= 'z'; i++) |
| 3524 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
| 3525 | for (i = 'A'; i <= 'Z'; i++) |
| 3526 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
| 3527 | for (i = '0'; i <= '9'; i++) |
| 3528 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, i, temp); |
| 3529 | |
| 3530 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '$', temp); |
| 3531 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '%', temp); |
| 3532 | |
| 3533 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '(', |
| 3534 | Fcons (make_number (Sopen), make_number (')'))); |
| 3535 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ')', |
| 3536 | Fcons (make_number (Sclose), make_number ('('))); |
| 3537 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '[', |
| 3538 | Fcons (make_number (Sopen), make_number (']'))); |
| 3539 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, ']', |
| 3540 | Fcons (make_number (Sclose), make_number ('['))); |
| 3541 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '{', |
| 3542 | Fcons (make_number (Sopen), make_number ('}'))); |
| 3543 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '}', |
| 3544 | Fcons (make_number (Sclose), make_number ('{'))); |
| 3545 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '"', |
| 3546 | Fcons (make_number (Sstring), Qnil)); |
| 3547 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, '\\', |
| 3548 | Fcons (make_number (Sescape), Qnil)); |
| 3549 | |
| 3550 | temp = AREF (Vsyntax_code_object, Ssymbol); |
| 3551 | for (i = 0; i < 10; i++) |
| 3552 | { |
| 3553 | c = "_-+*/&|<>="[i]; |
| 3554 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); |
| 3555 | } |
| 3556 | |
| 3557 | temp = AREF (Vsyntax_code_object, Spunct); |
| 3558 | for (i = 0; i < 12; i++) |
| 3559 | { |
| 3560 | c = ".,;:?!#@~^'`"[i]; |
| 3561 | SET_RAW_SYNTAX_ENTRY (Vstandard_syntax_table, c, temp); |
| 3562 | } |
| 3563 | |
| 3564 | /* All multibyte characters have syntax `word' by default. */ |
| 3565 | temp = AREF (Vsyntax_code_object, Sword); |
| 3566 | char_table_set_range (Vstandard_syntax_table, 0x80, MAX_CHAR, temp); |
| 3567 | } |
| 3568 | |
| 3569 | void |
| 3570 | syms_of_syntax (void) |
| 3571 | { |
| 3572 | DEFSYM (Qsyntax_table_p, "syntax-table-p"); |
| 3573 | |
| 3574 | staticpro (&Vsyntax_code_object); |
| 3575 | |
| 3576 | staticpro (&gl_state.object); |
| 3577 | staticpro (&gl_state.global_code); |
| 3578 | staticpro (&gl_state.current_syntax_table); |
| 3579 | staticpro (&gl_state.old_prop); |
| 3580 | |
| 3581 | /* Defined in regex.c */ |
| 3582 | staticpro (&re_match_object); |
| 3583 | |
| 3584 | DEFSYM (Qscan_error, "scan-error"); |
| 3585 | Fput (Qscan_error, Qerror_conditions, |
| 3586 | listn (CONSTYPE_PURE, 2, Qscan_error, Qerror)); |
| 3587 | Fput (Qscan_error, Qerror_message, |
| 3588 | build_pure_c_string ("Scan error")); |
| 3589 | |
| 3590 | DEFVAR_BOOL ("parse-sexp-ignore-comments", parse_sexp_ignore_comments, |
| 3591 | doc: /* Non-nil means `forward-sexp', etc., should treat comments as whitespace. */); |
| 3592 | |
| 3593 | DEFVAR_BOOL ("parse-sexp-lookup-properties", parse_sexp_lookup_properties, |
| 3594 | doc: /* Non-nil means `forward-sexp', etc., obey `syntax-table' property. |
| 3595 | Otherwise, that text property is simply ignored. |
| 3596 | See the info node `(elisp)Syntax Properties' for a description of the |
| 3597 | `syntax-table' property. */); |
| 3598 | |
| 3599 | words_include_escapes = 0; |
| 3600 | DEFVAR_BOOL ("words-include-escapes", words_include_escapes, |
| 3601 | doc: /* Non-nil means `forward-word', etc., should treat escape chars part of words. */); |
| 3602 | |
| 3603 | DEFVAR_BOOL ("multibyte-syntax-as-symbol", multibyte_syntax_as_symbol, |
| 3604 | doc: /* Non-nil means `scan-sexps' treats all multibyte characters as symbol. */); |
| 3605 | multibyte_syntax_as_symbol = 0; |
| 3606 | |
| 3607 | DEFVAR_BOOL ("open-paren-in-column-0-is-defun-start", |
| 3608 | open_paren_in_column_0_is_defun_start, |
| 3609 | doc: /* Non-nil means an open paren in column 0 denotes the start of a defun. */); |
| 3610 | open_paren_in_column_0_is_defun_start = 1; |
| 3611 | |
| 3612 | |
| 3613 | DEFVAR_LISP ("find-word-boundary-function-table", |
| 3614 | Vfind_word_boundary_function_table, |
| 3615 | doc: /* |
| 3616 | Char table of functions to search for the word boundary. |
| 3617 | Each function is called with two arguments; POS and LIMIT. |
| 3618 | POS and LIMIT are character positions in the current buffer. |
| 3619 | |
| 3620 | If POS is less than LIMIT, POS is at the first character of a word, |
| 3621 | and the return value of a function is a position after the last |
| 3622 | character of that word. |
| 3623 | |
| 3624 | If POS is not less than LIMIT, POS is at the last character of a word, |
| 3625 | and the return value of a function is a position at the first |
| 3626 | character of that word. |
| 3627 | |
| 3628 | In both cases, LIMIT bounds the search. */); |
| 3629 | Vfind_word_boundary_function_table = Fmake_char_table (Qnil, Qnil); |
| 3630 | |
| 3631 | defsubr (&Ssyntax_table_p); |
| 3632 | defsubr (&Ssyntax_table); |
| 3633 | defsubr (&Sstandard_syntax_table); |
| 3634 | defsubr (&Scopy_syntax_table); |
| 3635 | defsubr (&Sset_syntax_table); |
| 3636 | defsubr (&Schar_syntax); |
| 3637 | defsubr (&Smatching_paren); |
| 3638 | defsubr (&Sstring_to_syntax); |
| 3639 | defsubr (&Smodify_syntax_entry); |
| 3640 | defsubr (&Sinternal_describe_syntax_value); |
| 3641 | |
| 3642 | defsubr (&Sforward_word); |
| 3643 | |
| 3644 | defsubr (&Sskip_chars_forward); |
| 3645 | defsubr (&Sskip_chars_backward); |
| 3646 | defsubr (&Sskip_syntax_forward); |
| 3647 | defsubr (&Sskip_syntax_backward); |
| 3648 | |
| 3649 | defsubr (&Sforward_comment); |
| 3650 | defsubr (&Sscan_lists); |
| 3651 | defsubr (&Sscan_sexps); |
| 3652 | defsubr (&Sbackward_prefix_chars); |
| 3653 | defsubr (&Sparse_partial_sexp); |
| 3654 | } |