1 /* XEmacs routines to deal with syntax tables; also word and list parsing.
2 Copyright (C) 1985-1994 Free Software Foundation, Inc.
3 Copyright (C) 1995 Sun Microsystems, Inc.
4 Copyright (C) 2001 MORIOKA Tomohiko
6 This file is part of XEmacs.
8 XEmacs is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published by the
10 Free Software Foundation; either version 2, or (at your option) any
13 XEmacs is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with XEmacs; see the file COPYING. If not, write to
20 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
23 /* Synched up with: FSF 19.28. */
25 /* This file has been Mule-ized. */
34 /* Here is a comment from Ken'ichi HANDA <handa@etl.go.jp>
35 explaining the purpose of the Sextword syntax category:
37 Japanese words are not separated by spaces, which makes finding word
38 boundaries very difficult. Theoretically it's impossible without
39 using natural language processing techniques. But, by defining
40 pseudo-words as below (much simplified for letting you understand it
41 easily) for Japanese, we can have a convenient forward-word function
44 A Japanese word is a sequence of characters that consists of
45 zero or more Kanji characters followed by zero or more
48 Then, the problem is that now we can't say that a sequence of
49 word-constituents makes up a WORD. For instance, both Hiragana "A"
50 and Kanji "KAN" are word-constituents but the sequence of these two
51 letters can't be a single word.
53 So, we introduced Sextword for Japanese letters. A character of
54 Sextword is a word-constituent but a word boundary may exist between
55 two such characters. */
57 /* Mule 2.4 doesn't seem to have Sextword - I'm removing it -- mrb */
58 /* Recovered by tomo */
60 #define ST_COMMENT_STYLE 0x101
61 #define ST_STRING_STYLE 0x102
63 Lisp_Object Qsyntax_table;
64 int lookup_syntax_properties;
66 Lisp_Object Qsyntax_table_p;
68 int words_include_escapes;
70 int parse_sexp_ignore_comments;
72 /* The following two variables are provided to tell additional information
73 to the regex routines. We do it this way rather than change the
74 arguments to re_search_2() in an attempt to maintain some call
75 compatibility with other versions of the regex code. */
77 /* Tell the regex routines not to QUIT. Normally there is a QUIT
78 each iteration in re_search_2(). */
79 int no_quit_in_re_search;
81 /* Tell the regex routines which buffer to access for SYNTAX() lookups
83 struct buffer *regex_emacs_buffer;
85 /* In Emacs, this is the string or buffer in which we
86 are matching. It is used for looking up syntax properties. */
87 Lisp_Object regex_match_object;
89 Lisp_Object Vstandard_syntax_table;
91 Lisp_Object Vsyntax_designator_chars_string;
93 /* This is the internal form of the parse state used in parse-partial-sexp. */
95 struct lisp_parse_state
97 int depth; /* Depth at end of parsing */
98 Emchar instring; /* -1 if not within string, else desired terminator */
99 int incomment; /* Nonzero if within a comment at end of parsing */
100 int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE */
101 int quoted; /* Nonzero if just after an escape char at end of
103 Bufpos thislevelstart;/* Char number of most recent start-of-expression
105 Bufpos prevlevelstart;/* Char number of start of containing expression */
106 Bufpos location; /* Char number at which parsing stopped */
107 int mindepth; /* Minimum depth seen while scanning */
108 Bufpos comstr_start; /* Position just after last comment/string starter */
109 Lisp_Object levelstarts; /* Char numbers of starts-of-expression
110 of levels (starting from outermost). */
113 /* These variables are a cache for finding the start of a defun.
114 find_start_pos is the place for which the defun start was found.
115 find_start_value is the defun start position found for it.
116 find_start_buffer is the buffer it was found in.
117 find_start_begv is the BEGV value when it was found.
118 find_start_modiff is the value of MODIFF when it was found. */
120 static Bufpos find_start_pos;
121 static Bufpos find_start_value;
122 static struct buffer *find_start_buffer;
123 static Bufpos find_start_begv;
124 static int find_start_modiff;
126 /* Find a defun-start that is the last one before POS (or nearly the last).
127 We record what we find, so that another call in the same area
128 can return the same value right away. */
131 find_defun_start (struct buffer *buf, Bufpos pos)
135 /* Use previous finding, if it's valid and applies to this inquiry. */
136 if (buf == find_start_buffer
137 /* Reuse the defun-start even if POS is a little farther on.
138 POS might be in the next defun, but that's ok.
139 Our value may not be the best possible, but will still be usable. */
140 && pos <= find_start_pos + 1000
141 && pos >= find_start_value
142 && BUF_BEGV (buf) == find_start_begv
143 && BUF_MODIFF (buf) == find_start_modiff)
144 return find_start_value;
146 /* Back up to start of line. */
147 tem = find_next_newline (buf, pos, -1);
149 SETUP_SYNTAX_CACHE (tem, 1);
150 while (tem > BUF_BEGV (buf))
152 UPDATE_SYNTAX_CACHE_BACKWARD(tem);
154 /* Open-paren at start of line means we found our defun-start. */
155 if (SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, tem)) == Sopen)
157 /* Move to beg of previous line. */
158 tem = find_next_newline (buf, tem, -2);
161 /* Record what we found, for the next try. */
162 find_start_value = tem;
163 find_start_buffer = buf;
164 find_start_modiff = BUF_MODIFF (buf);
165 find_start_begv = BUF_BEGV (buf);
166 find_start_pos = pos;
168 return find_start_value;
171 DEFUN ("syntax-table-p", Fsyntax_table_p, 1, 1, 0, /*
172 Return t if OBJECT is a syntax table.
173 Any vector of 256 elements will do.
177 return (CHAR_TABLEP (object)
178 && XCHAR_TABLE_TYPE (object) == CHAR_TABLE_TYPE_SYNTAX)
183 check_syntax_table (Lisp_Object obj, Lisp_Object default_)
187 while (NILP (Fsyntax_table_p (obj)))
188 obj = wrong_type_argument (Qsyntax_table_p, obj);
192 DEFUN ("syntax-table", Fsyntax_table, 0, 1, 0, /*
193 Return the current syntax table.
194 This is the one specified by the current buffer, or by BUFFER if it
199 return decode_buffer (buffer, 0)->syntax_table;
202 DEFUN ("standard-syntax-table", Fstandard_syntax_table, 0, 0, 0, /*
203 Return the standard syntax table.
204 This is the one used for new buffers.
208 return Vstandard_syntax_table;
211 DEFUN ("copy-syntax-table", Fcopy_syntax_table, 0, 1, 0, /*
212 Return a new syntax table which is a copy of SYNTAX-TABLE.
213 SYNTAX-TABLE defaults to the standard syntax table.
217 if (NILP (Vstandard_syntax_table))
218 return Fmake_char_table (Qsyntax);
220 syntax_table = check_syntax_table (syntax_table, Vstandard_syntax_table);
221 return Fcopy_char_table (syntax_table);
224 DEFUN ("set-syntax-table", Fset_syntax_table, 1, 2, 0, /*
225 Select SYNTAX-TABLE as the new syntax table for BUFFER.
226 BUFFER defaults to the current buffer if omitted.
228 (syntax_table, buffer))
230 struct buffer *buf = decode_buffer (buffer, 0);
231 syntax_table = check_syntax_table (syntax_table, Qnil);
232 buf->syntax_table = syntax_table;
234 buf->mirror_syntax_table = XCHAR_TABLE (syntax_table)->mirror_table;
236 /* Indicate that this buffer now has a specified syntax table. */
237 buf->local_var_flags |= XINT (buffer_local_flags.syntax_table);
241 /* The current syntax state */
242 struct syntax_cache syntax_cache;
246 Update syntax_cache to an appropriate setting for position POS
248 The sign of COUNT gives the relative position of POS wrt the
249 previously valid interval. (not currently used)
251 `syntax_cache.*_change' are the next and previous positions at
252 which syntax_code and c_s_t will need to be recalculated.
254 #### Currently this code uses 'get-char-property', which will
255 return the "last smallest" extent at a given position. In cases
256 where overlapping extents are defined, this code will simply use
257 whatever is returned by get-char-property.
259 It might be worth it at some point to merge provided syntax tables
260 outward to the current buffer. */
263 update_syntax_cache (int pos, int count, int init)
265 Lisp_Object tmp_table;
269 syntax_cache.prev_change = -1;
270 syntax_cache.next_change = -1;
273 if (pos > syntax_cache.prev_change &&
274 pos < syntax_cache.next_change)
280 if (NILP (syntax_cache.object) || EQ (syntax_cache.object, Qt))
282 int get_change_before = pos + 1;
284 tmp_table = Fget_char_property (make_int(pos), Qsyntax_table,
285 make_buffer (syntax_cache.buffer), Qnil);
286 syntax_cache.next_change =
287 XINT (Fnext_extent_change (make_int (pos > 0 ? pos : 1),
288 make_buffer (syntax_cache.buffer)));
290 if (get_change_before < 1)
291 get_change_before = 1;
292 else if (get_change_before > BUF_ZV (syntax_cache.buffer))
293 get_change_before = BUF_ZV (syntax_cache.buffer);
295 syntax_cache.prev_change =
296 XINT (Fprevious_extent_change (make_int (get_change_before),
297 make_buffer (syntax_cache.buffer)));
301 int get_change_before = pos + 1;
303 tmp_table = Fget_char_property (make_int(pos), Qsyntax_table,
304 syntax_cache.object, Qnil);
305 syntax_cache.next_change =
306 XINT (Fnext_extent_change (make_int (pos >= 0 ? pos : 0),
307 syntax_cache.object));
309 if (get_change_before < 0)
310 get_change_before = 0;
311 else if (get_change_before > XSTRING_LENGTH(syntax_cache.object))
312 get_change_before = XSTRING_LENGTH(syntax_cache.object);
314 syntax_cache.prev_change =
315 XINT (Fprevious_extent_change (make_int (pos >= 0 ? pos : 0),
316 syntax_cache.object));
319 if (EQ (Fsyntax_table_p (tmp_table), Qt))
321 syntax_cache.use_code = 0;
323 syntax_cache.current_syntax_table = tmp_table;
325 syntax_cache.current_syntax_table =
326 XCHAR_TABLE (tmp_table)->mirror_table;
329 else if (CONSP (tmp_table) && INTP (XCAR (tmp_table)))
331 syntax_cache.use_code = 1;
332 syntax_cache.syntax_code = XINT (XCAR(tmp_table));
336 syntax_cache.use_code = 0;
338 syntax_cache.current_syntax_table =
339 syntax_cache.buffer->syntax_table;
341 syntax_cache.current_syntax_table =
342 syntax_cache.buffer->mirror_syntax_table;
348 /* Convert a letter which signifies a syntax code
349 into the code it signifies.
350 This is used by modify-syntax-entry, and other things. */
352 const unsigned char syntax_spec_code[0400] =
353 { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
354 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
355 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
356 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
357 (char) Swhitespace, 0377, (char) Sstring, 0377,
358 (char) Smath, 0377, 0377, (char) Squote,
359 (char) Sopen, (char) Sclose, 0377, 0377,
360 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote,
361 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
362 0377, 0377, 0377, 0377,
363 (char) Scomment, 0377, (char) Sendcomment, 0377,
364 (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */
365 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
366 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
367 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol,
368 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */
369 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
370 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
371 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377
374 const unsigned char syntax_code_spec[] = " .w_()'\"$\\/<>@!|";
376 DEFUN ("syntax-designator-chars", Fsyntax_designator_chars, 0, 0, 0, /*
377 Return a string of the recognized syntax designator chars.
378 The chars are ordered by their internal syntax codes, which are
379 numbered starting at 0.
383 return Vsyntax_designator_chars_string;
386 DEFUN ("char-syntax", Fchar_syntax, 1, 2, 0, /*
387 Return the syntax code of CHARACTER, described by a character.
388 For example, if CHARACTER is a word constituent,
389 the character `?w' is returned.
390 The characters that correspond to various syntax codes
391 are listed in the documentation of `modify-syntax-entry'.
392 Optional second argument SYNTAX-TABLE defaults to the current buffer's
395 (character, syntax_table))
398 Lisp_Char_Table *mirrortab;
401 if (NILP (character))
403 character = make_char ('\000');
405 CHECK_CHAR_COERCE_INT (character);
406 syntax_table = check_syntax_table (syntax_table, current_buffer->syntax_table);
408 return make_char (syntax_code_spec[(int) SYNTAX (XCHAR_TABLE(syntax_table),
409 XCHAR (character))]);
411 mirrortab = XCHAR_TABLE (XCHAR_TABLE (syntax_table)->mirror_table);
412 return make_char (syntax_code_spec[(int) SYNTAX (mirrortab, XCHAR (character))]);
419 charset_syntax (struct buffer *buf, Lisp_Object charset, int *multi_p_out)
422 /* #### get this right */
429 syntax_match (Lisp_Object syntax_table, Emchar ch)
431 Lisp_Object code = XCHAR_TABLE_VALUE_UNSAFE (syntax_table, ch);
432 Lisp_Object code2 = code;
436 if (SYNTAX_FROM_CODE (XINT (code2)) == Sinherit)
437 code = XCHAR_TABLE_VALUE_UNSAFE (Vstandard_syntax_table, ch);
439 return CONSP (code) ? XCDR (code) : Qnil;
442 DEFUN ("matching-paren", Fmatching_paren, 1, 2, 0, /*
443 Return the matching parenthesis of CHARACTER, or nil if none.
444 Optional second argument SYNTAX-TABLE defaults to the current buffer's
447 (character, syntax_table))
450 Lisp_Char_Table *mirrortab;
454 CHECK_CHAR_COERCE_INT (character);
455 syntax_table = check_syntax_table (syntax_table, current_buffer->syntax_table);
457 code = SYNTAX (XCHAR_TABLE (syntax_table), XCHAR (character));
459 mirrortab = XCHAR_TABLE (XCHAR_TABLE (syntax_table)->mirror_table);
460 code = SYNTAX (mirrortab, XCHAR (character));
462 if (code == Sopen || code == Sclose || code == Sstring)
463 return syntax_match (syntax_table, XCHAR (character));
470 /* Return 1 if there is a word boundary between two word-constituent
471 characters C1 and C2 if they appear in this order, else return 0.
472 There is no word boundary between two word-constituent ASCII
474 #define WORD_BOUNDARY_P(c1, c2) \
475 (!(CHAR_ASCII_P (c1) && CHAR_ASCII_P (c2)) \
476 && word_boundary_p (c1, c2))
478 extern int word_boundary_p (Emchar c1, Emchar c2);
481 /* Return the position across COUNT words from FROM.
482 If that many words cannot be found before the end of the buffer, return 0.
483 COUNT negative means scan backward and stop at word beginning. */
486 scan_words (struct buffer *buf, Bufpos from, int count)
488 Bufpos limit = count > 0 ? BUF_ZV (buf) : BUF_BEGV (buf);
490 enum syntaxcode code;
492 SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, from, count);
494 /* #### is it really worth it to hand expand both cases? JV */
504 UPDATE_SYNTAX_CACHE_FORWARD (from);
505 ch0 = BUF_FETCH_CHAR (buf, from);
506 code = SYNTAX_FROM_CACHE (mirrortab, ch0);
509 if (words_include_escapes
510 && (code == Sescape || code == Scharquote))
518 while (from != limit)
520 UPDATE_SYNTAX_CACHE_FORWARD (from);
521 ch1 = BUF_FETCH_CHAR (buf, from);
522 code = SYNTAX_FROM_CACHE (mirrortab, ch1);
523 if (!(words_include_escapes
524 && (code == Sescape || code == Scharquote)))
527 || WORD_BOUNDARY_P (ch0, ch1)
548 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
549 ch1 = BUF_FETCH_CHAR (buf, from - 1);
550 code = SYNTAX_FROM_CACHE (mirrortab, ch1);
553 if (words_include_escapes
554 && (code == Sescape || code == Scharquote))
562 while (from != limit)
564 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
565 ch0 = BUF_FETCH_CHAR (buf, from - 1);
566 code = SYNTAX_FROM_CACHE (mirrortab, ch0);
568 if (!(words_include_escapes
569 && (code == Sescape || code == Scharquote)))
572 || WORD_BOUNDARY_P (ch0, ch1)
587 DEFUN ("forward-word", Fforward_word, 0, 2, "_p", /*
588 Move point forward COUNT words (backward if COUNT is negative).
589 Normally t is returned, but if an edge of the buffer is reached,
590 point is left there and nil is returned.
592 COUNT defaults to 1, and BUFFER defaults to the current buffer.
597 struct buffer *buf = decode_buffer (buffer, 0);
608 val = scan_words (buf, BUF_PT (buf), n);
611 BUF_SET_PT (buf, val);
616 BUF_SET_PT (buf, n > 0 ? BUF_ZV (buf) : BUF_BEGV (buf));
621 static void scan_sexps_forward (struct buffer *buf,
622 struct lisp_parse_state *,
623 Bufpos from, Bufpos end,
624 int targetdepth, int stopbefore,
625 Lisp_Object oldstate,
629 find_start_of_comment (struct buffer *buf, Bufpos from, Bufpos stop,
633 enum syntaxcode code;
635 /* Look back, counting the parity of string-quotes,
636 and recording the comment-starters seen.
637 When we reach a safe place, assume that's not in a string;
638 then step the main scan to the earliest comment-starter seen
639 an even number of string quotes away from the safe place.
641 OFROM[I] is position of the earliest comment-starter seen
642 which is I+2X quotes from the comment-end.
643 PARITY is current parity of quotes from the comment end. */
645 Emchar my_stringend = 0;
646 int string_lossage = 0;
647 Bufpos comment_end = from;
648 Bufpos comstart_pos = 0;
649 int comstart_parity = 0;
650 int styles_match_p = 0;
651 /* mask to match comment styles against; for ST_COMMENT_STYLE, this
652 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */
653 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A;
655 /* At beginning of range to scan, we're outside of strings;
656 that determines quote parity to the comment-end. */
661 /* Move back and examine a character. */
663 UPDATE_SYNTAX_CACHE_BACKWARD (from);
665 c = BUF_FETCH_CHAR (buf, from);
666 code = SYNTAX_FROM_CACHE (mirrortab, c);
667 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
669 /* is this a 1-char comment end sequence? if so, try
670 to see if style matches previously extracted mask */
671 if (code == Sendcomment)
674 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask;
677 /* or are we looking at a 1-char comment start sequence
678 of the style matching mask? */
679 else if (code == Scomment)
682 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask;
685 /* otherwise, is this a 2-char comment end or start sequence? */
686 else if (from > stop)
689 /* 2-char comment end sequence? */
690 if (SYNTAX_CODE_END_SECOND_P (syncode))
693 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
695 SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from - 1));
697 if (SYNTAX_CODES_END_P (prev_syncode, syncode))
701 SYNTAX_CODES_COMMENT_MASK_END (prev_syncode, syncode);
703 UPDATE_SYNTAX_CACHE_BACKWARD (from);
704 c = BUF_FETCH_CHAR (buf, from);
706 /* Found a comment-end sequence, so skip past the
707 check for a comment-start */
712 /* 2-char comment start sequence? */
713 if (SYNTAX_CODE_START_SECOND_P (syncode))
716 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
718 SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from - 1));
720 if (SYNTAX_CODES_START_P (prev_syncode, syncode))
724 SYNTAX_CODES_COMMENT_MASK_START (prev_syncode, syncode);
726 UPDATE_SYNTAX_CACHE_BACKWARD (from);
727 c = BUF_FETCH_CHAR (buf, from);
732 /* Ignore escaped characters. */
733 if (char_quoted (buf, from))
736 /* Track parity of quotes. */
740 if (my_stringend == 0)
742 /* If we have two kinds of string delimiters.
743 There's no way to grok this scanning backwards. */
744 else if (my_stringend != c)
748 if (code == Sstring_fence || code == Scomment_fence)
751 if (my_stringend == 0)
753 code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE;
754 /* If we have two kinds of string delimiters.
755 There's no way to grok this scanning backwards. */
756 else if (my_stringend != (code == Sstring_fence
757 ? ST_STRING_STYLE : ST_COMMENT_STYLE))
761 /* Record comment-starters according to that
762 quote-parity to the comment-end. */
763 if (code == Scomment && styles_match_p)
765 comstart_parity = parity;
769 /* If we find another earlier comment-ender,
770 any comment-starts earlier than that don't count
771 (because they go with the earlier comment-ender). */
772 if (code == Sendcomment && styles_match_p)
775 /* Assume a defun-start point is outside of strings. */
777 && (from == stop || BUF_FETCH_CHAR (buf, from - 1) == '\n'))
781 if (comstart_pos == 0)
783 /* If the earliest comment starter
784 is followed by uniform paired string quotes or none,
785 we know it can't be inside a string
786 since if it were then the comment ender would be inside one.
787 So it does start a comment. Skip back to it. */
788 else if (comstart_parity == 0 && !string_lossage)
792 /* We had two kinds of string delimiters mixed up
793 together. Decode this going forwards.
794 Scan fwd from the previous comment ender
795 to the one in question; this records where we
796 last passed a comment starter. */
798 struct lisp_parse_state state;
799 scan_sexps_forward (buf, &state, find_defun_start (buf, comment_end),
800 comment_end - 1, -10000, 0, Qnil, 0);
802 from = state.comstr_start;
804 /* We can't grok this as a comment; scan it normally. */
806 UPDATE_SYNTAX_CACHE_FORWARD (from - 1);
812 find_end_of_comment (struct buffer *buf, Bufpos from, Bufpos stop, int comstyle)
816 /* mask to match comment styles against; for ST_COMMENT_STYLE, this
817 will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */
818 int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A;
820 /* This is only called by functions which have already set up the
821 syntax_cache and are keeping it up-to-date */
829 UPDATE_SYNTAX_CACHE_FORWARD (from);
830 c = BUF_FETCH_CHAR (buf, from);
832 /* Test for generic comments */
833 if (comstyle == ST_COMMENT_STYLE)
835 if (SYNTAX_FROM_CACHE (mirrortab, c) == Scomment_fence)
838 UPDATE_SYNTAX_CACHE_FORWARD (from);
842 continue; /* No need to test other comment styles in a
847 if (SYNTAX_FROM_CACHE (mirrortab, c) == Sendcomment
848 && SYNTAX_CODE_MATCHES_1CHAR_P
849 (SYNTAX_CODE_FROM_CACHE (mirrortab, c), mask))
850 /* we have encountered a comment end of the same style
851 as the comment sequence which began this comment
855 UPDATE_SYNTAX_CACHE_FORWARD (from);
859 prev_code = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
861 UPDATE_SYNTAX_CACHE_FORWARD (from);
863 && SYNTAX_CODES_MATCH_END_P
865 SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from)),
869 /* we have encountered a comment end of the same style
870 as the comment sequence which began this comment
874 UPDATE_SYNTAX_CACHE_FORWARD (from);
882 /* #### between FSF 19.23 and 19.28 there are some changes to the logic
883 in this function (and minor changes to find_start_of_comment(),
884 above, which is part of Fforward_comment() in FSF). Attempts to port
885 that logic made this function break, so I'm leaving it out. If anyone
886 ever complains about this function not working properly, take a look
887 at those changes. --ben */
889 DEFUN ("forward-comment", Fforward_comment, 0, 2, 0, /*
890 Move forward across up to COUNT comments, or backwards if COUNT is negative.
891 Stop scanning if we find something other than a comment or whitespace.
892 Set point to where scanning stops.
893 If COUNT comments are found as expected, with nothing except whitespace
894 between them, return t; otherwise return nil.
895 Point is set in either case.
896 COUNT defaults to 1, and BUFFER defaults to the current buffer.
903 enum syntaxcode code;
906 struct buffer *buf = decode_buffer (buffer, 0);
918 SETUP_SYNTAX_CACHE (from, n);
926 int comstyle = 0; /* mask for finding matching comment style */
928 if (char_quoted (buf, from))
934 UPDATE_SYNTAX_CACHE_FORWARD (from);
935 c = BUF_FETCH_CHAR (buf, from);
936 code = SYNTAX_FROM_CACHE (mirrortab, c);
937 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
939 if (code == Scomment)
941 /* we have encountered a single character comment start
942 sequence, and we are ignoring all text inside comments.
943 we must record the comment style this character begins
944 so that later, only a comment end of the same style actually
945 ends the comment section */
946 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
947 == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
950 else if (code == Scomment_fence)
954 comstyle = ST_COMMENT_STYLE;
958 && SYNTAX_CODE_START_FIRST_P (syncode))
961 UPDATE_SYNTAX_CACHE_FORWARD (from + 1);
963 SYNTAX_CODE_FROM_CACHE (mirrortab,
964 BUF_FETCH_CHAR (buf, from + 1));
966 if (SYNTAX_CODES_START_P (syncode, next_syncode))
968 /* we have encountered a 2char comment start sequence and we
969 are ignoring all text inside comments. we must record
970 the comment style this sequence begins so that later,
971 only a comment end of the same style actually ends
972 the comment section */
975 SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode)
976 == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
981 if (code == Scomment)
983 Bufpos newfrom = find_end_of_comment (buf, from, stop, comstyle);
986 /* we stopped because from==stop */
987 BUF_SET_PT (buf, stop);
992 /* We have skipped one comment. */
995 else if (code != Swhitespace
996 && code != Sendcomment
997 && code != Scomment )
999 BUF_SET_PT (buf, from);
1005 /* End of comment reached */
1013 stop = BUF_BEGV (buf);
1016 int comstyle = 0; /* mask for finding matching comment style */
1019 if (char_quoted (buf, from))
1025 c = BUF_FETCH_CHAR (buf, from);
1026 code = SYNTAX_FROM_CACHE (mirrortab, c);
1027 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
1029 if (code == Sendcomment)
1031 /* we have found a single char end comment. we must record
1032 the comment style encountered so that later, we can match
1033 only the proper comment begin sequence of the same style */
1034 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
1035 == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1038 else if (code == Scomment_fence)
1041 comstyle = ST_COMMENT_STYLE;
1044 else if (from > stop
1045 && SYNTAX_CODE_END_SECOND_P (syncode))
1048 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
1050 SYNTAX_CODE_FROM_CACHE (mirrortab,
1051 BUF_FETCH_CHAR (buf, from - 1));
1052 if (SYNTAX_CODES_END_P (prev_syncode, syncode))
1054 /* We must record the comment style encountered so that
1055 later, we can match only the proper comment begin
1056 sequence of the same style. */
1058 comstyle = SYNTAX_CODES_COMMENT_MASK_END
1059 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1064 if (code == Sendcomment)
1066 from = find_start_of_comment (buf, from, stop, comstyle);
1070 else if (code != Swhitespace
1072 && code != Sendcomment)
1074 BUF_SET_PT (buf, from + 1);
1082 BUF_SET_PT (buf, from);
1088 scan_lists (struct buffer *buf, Bufpos from, int count, int depth,
1089 int sexpflag, int noerror)
1095 enum syntaxcode code;
1097 int min_depth = depth; /* Err out if depth gets less than this. */
1099 if (depth > 0) min_depth = 0;
1101 SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, from, count);
1106 stop = BUF_ZV (buf);
1109 int comstyle = 0; /* mask for finding matching comment style */
1111 UPDATE_SYNTAX_CACHE_FORWARD (from);
1112 c = BUF_FETCH_CHAR (buf, from);
1113 code = SYNTAX_FROM_CACHE (mirrortab, c);
1114 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
1117 /* a 1-char comment start sequence */
1118 if (code == Scomment && parse_sexp_ignore_comments)
1120 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) ==
1121 SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1124 /* else, a 2-char comment start sequence? */
1125 else if (from < stop
1126 && SYNTAX_CODE_START_FIRST_P (syncode)
1127 && parse_sexp_ignore_comments)
1130 UPDATE_SYNTAX_CACHE_FORWARD (from);
1132 SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from));
1134 if (SYNTAX_CODES_START_P (syncode, next_syncode))
1136 /* we have encountered a comment start sequence and we
1137 are ignoring all text inside comments. we must record
1138 the comment style this sequence begins so that later,
1139 only a comment end of the same style actually ends
1140 the comment section */
1142 comstyle = SYNTAX_CODES_COMMENT_MASK_START
1143 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1147 UPDATE_SYNTAX_CACHE_FORWARD (from);
1149 if (SYNTAX_CODE_PREFIX (syncode))
1156 if (from == stop) goto lose;
1158 /* treat following character as a word constituent */
1161 if (depth || !sexpflag) break;
1162 /* This word counts as a sexp; return at end of it. */
1165 UPDATE_SYNTAX_CACHE_FORWARD (from);
1166 switch (SYNTAX_FROM_CACHE (mirrortab,
1167 BUF_FETCH_CHAR (buf, from)))
1172 if (from == stop) goto lose;
1185 case Scomment_fence:
1186 comstyle = ST_COMMENT_STYLE;
1188 if (!parse_sexp_ignore_comments)
1190 UPDATE_SYNTAX_CACHE_FORWARD (from);
1193 find_end_of_comment (buf, from, stop, comstyle);
1196 /* we stopped because from == stop in search forward */
1209 if (from != stop && c == BUF_FETCH_CHAR (buf, from))
1219 if (!++depth) goto done;
1224 if (!--depth) goto done;
1225 if (depth < min_depth)
1229 error ("Containing expression ends prematurely");
1238 if (code != Sstring_fence)
1240 /* XEmacs change: call syntax_match on character */
1241 Emchar ch = BUF_FETCH_CHAR (buf, from - 1);
1242 Lisp_Object stermobj =
1243 syntax_match (syntax_cache.current_syntax_table, ch);
1245 if (CHARP (stermobj))
1246 stringterm = XCHAR (stermobj);
1251 stringterm = '\0'; /* avoid compiler warnings */
1257 UPDATE_SYNTAX_CACHE_FORWARD (from);
1258 c = BUF_FETCH_CHAR (buf, from);
1261 : SYNTAX_FROM_CACHE (mirrortab, c) == Sstring_fence)
1264 switch (SYNTAX_FROM_CACHE (mirrortab, c))
1276 if (!depth && sexpflag) goto done;
1285 /* Reached end of buffer. Error if within object,
1286 return nil if between */
1287 if (depth) goto lose;
1291 /* End of object reached */
1300 stop = BUF_BEGV (buf);
1303 int comstyle = 0; /* mask for finding matching comment style */
1306 UPDATE_SYNTAX_CACHE_BACKWARD (from);
1307 quoted = char_quoted (buf, from);
1311 UPDATE_SYNTAX_CACHE_BACKWARD (from);
1314 c = BUF_FETCH_CHAR (buf, from);
1315 code = SYNTAX_FROM_CACHE (mirrortab, c);
1316 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
1318 if (code == Sendcomment && parse_sexp_ignore_comments)
1320 /* we have found a single char end comment. we must record
1321 the comment style encountered so that later, we can match
1322 only the proper comment begin sequence of the same style */
1323 comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
1324 == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1327 else if (from > stop
1328 && SYNTAX_CODE_END_SECOND_P (syncode)
1329 && !char_quoted (buf, from - 1)
1330 && parse_sexp_ignore_comments)
1333 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
1334 prev_syncode = SYNTAX_CODE_FROM_CACHE
1335 (mirrortab, BUF_FETCH_CHAR (buf, from - 1));
1337 if (SYNTAX_CODES_END_P (prev_syncode, syncode))
1339 /* we must record the comment style encountered so that
1340 later, we can match only the proper comment begin
1341 sequence of the same style */
1343 comstyle = SYNTAX_CODES_COMMENT_MASK_END
1344 (prev_syncode, syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1349 if (SYNTAX_CODE_PREFIX (syncode))
1352 switch (quoted ? Sword : code)
1356 if (depth || !sexpflag) break;
1357 /* This word counts as a sexp; count object finished after
1361 UPDATE_SYNTAX_CACHE_BACKWARD (from);
1362 quoted = char_quoted (buf, from - 1);
1368 SYNTAX_FROM_CACHE (mirrortab,
1369 BUF_FETCH_CHAR (buf, from - 1)))
1371 || syncode == Ssymbol
1372 || syncode == Squote))
1381 if (from != stop && c == BUF_FETCH_CHAR (buf, from - 1))
1391 if (!++depth) goto done2;
1396 if (!--depth) goto done2;
1397 if (depth < min_depth)
1401 error ("Containing expression ends prematurely");
1405 case Scomment_fence:
1406 comstyle = ST_COMMENT_STYLE;
1408 if (parse_sexp_ignore_comments)
1409 from = find_start_of_comment (buf, from, stop, comstyle);
1417 if (code != Sstring_fence)
1419 /* XEmacs change: call syntax_match() on character */
1420 Emchar ch = BUF_FETCH_CHAR (buf, from);
1421 Lisp_Object stermobj =
1422 syntax_match (syntax_cache.current_syntax_table, ch);
1424 if (CHARP (stermobj))
1425 stringterm = XCHAR (stermobj);
1430 stringterm = '\0'; /* avoid compiler warnings */
1434 if (from == stop) goto lose;
1436 UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
1437 c = BUF_FETCH_CHAR (buf, from - 1);
1439 if ((code == Sstring
1441 : SYNTAX_FROM_CACHE (mirrortab, c) == Sstring_fence)
1442 && !char_quoted (buf, from - 1))
1450 if (!depth && sexpflag) goto done2;
1456 /* Reached start of buffer. Error if within object,
1457 return nil if between */
1458 if (depth) goto lose;
1467 return (make_int (from));
1471 error ("Unbalanced parentheses");
1476 char_quoted (struct buffer *buf, Bufpos pos)
1478 enum syntaxcode code;
1479 Bufpos beg = BUF_BEGV (buf);
1481 Bufpos startpos = pos;
1485 UPDATE_SYNTAX_CACHE_BACKWARD (pos - 1);
1486 code = SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, pos - 1));
1488 if (code != Scharquote && code != Sescape)
1494 UPDATE_SYNTAX_CACHE (startpos);
1498 DEFUN ("scan-lists", Fscan_lists, 3, 5, 0, /*
1499 Scan from character number FROM by COUNT lists.
1500 Returns the character number of the position thus found.
1502 If DEPTH is nonzero, paren depth begins counting from that value,
1503 only places where the depth in parentheses becomes zero
1504 are candidates for stopping; COUNT such places are counted.
1505 Thus, a positive value for DEPTH means go out levels.
1507 Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
1509 If the beginning or end of (the accessible part of) the buffer is reached
1510 and the depth is wrong, an error is signaled.
1511 If the depth is right but the count is not used up, nil is returned.
1513 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
1514 of in the current buffer.
1516 If optional arg NOERROR is non-nil, scan-lists will return nil instead of
1517 signalling an error.
1519 (from, count, depth, buffer, noerror))
1526 buf = decode_buffer (buffer, 0);
1528 return scan_lists (buf, XINT (from), XINT (count), XINT (depth), 0,
1532 DEFUN ("scan-sexps", Fscan_sexps, 2, 4, 0, /*
1533 Scan from character number FROM by COUNT balanced expressions.
1534 If COUNT is negative, scan backwards.
1535 Returns the character number of the position thus found.
1537 Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
1539 If the beginning or end of (the accessible part of) the buffer is reached
1540 in the middle of a parenthetical grouping, an error is signaled.
1541 If the beginning or end is reached between groupings
1542 but before count is used up, nil is returned.
1544 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
1545 of in the current buffer.
1547 If optional arg NOERROR is non-nil, scan-sexps will return nil instead of
1548 signalling an error.
1550 (from, count, buffer, noerror))
1552 struct buffer *buf = decode_buffer (buffer, 0);
1556 return scan_lists (buf, XINT (from), XINT (count), 0, 1, !NILP (noerror));
1559 DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, 0, 1, 0, /*
1560 Move point backward over any number of chars with prefix syntax.
1561 This includes chars with "quote" or "prefix" syntax (' or p).
1563 Optional arg BUFFER defaults to the current buffer.
1567 struct buffer *buf = decode_buffer (buffer, 0);
1568 Bufpos beg = BUF_BEGV (buf);
1569 Bufpos pos = BUF_PT (buf);
1572 Lisp_Char_Table *mirrortab = XCHAR_TABLE (buf->syntax_table);
1574 Lisp_Char_Table *mirrortab = XCHAR_TABLE (buf->mirror_syntax_table);
1577 Emchar c = '\0'; /* initialize to avoid compiler warnings */
1580 SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, pos, -1);
1582 while (pos > beg && !char_quoted (buf, pos - 1)
1583 /* Previous statement updates syntax table. */
1584 && (SYNTAX_FROM_CACHE (mirrortab, c = BUF_FETCH_CHAR (buf, pos - 1)) == Squote
1585 || SYNTAX_CODE_PREFIX (SYNTAX_CODE_FROM_CACHE (mirrortab, c))))
1588 BUF_SET_PT (buf, pos);
1593 /* Parse forward from FROM to END,
1594 assuming that FROM has state OLDSTATE (nil means FROM is start of function),
1595 and return a description of the state of the parse at END.
1596 If STOPBEFORE is nonzero, stop at the start of an atom.
1597 If COMMENTSTOP is nonzero, stop at the start of a comment. */
1600 scan_sexps_forward (struct buffer *buf, struct lisp_parse_state *stateptr,
1601 Bufpos from, Bufpos end,
1602 int targetdepth, int stopbefore,
1603 Lisp_Object oldstate,
1606 struct lisp_parse_state state;
1608 enum syntaxcode code;
1609 struct level { int last, prev; };
1610 struct level levelstart[100];
1611 struct level *curlevel = levelstart;
1612 struct level *endlevel = levelstart + 100;
1613 int depth; /* Paren depth of current scanning location.
1614 level - levelstart equals this except
1615 when the depth becomes negative. */
1616 int mindepth; /* Lowest DEPTH value seen. */
1617 int start_quoted = 0; /* Nonzero means starting after a char quote */
1618 int boundary_stop = commentstop == -1;
1621 SETUP_SYNTAX_CACHE (from, 1);
1622 if (NILP (oldstate))
1625 state.instring = -1;
1626 state.incomment = 0;
1627 state.comstyle = 0; /* comment style a by default */
1628 state.comstr_start = -1; /* no comment/string seen. */
1632 tem = Fcar (oldstate); /* elt 0, depth */
1638 oldstate = Fcdr (oldstate);
1639 oldstate = Fcdr (oldstate);
1640 oldstate = Fcdr (oldstate);
1641 tem = Fcar (oldstate); /* elt 3, instring */
1642 state.instring = ( !NILP (tem)
1643 ? ( INTP (tem) ? XINT (tem) : ST_STRING_STYLE)
1646 oldstate = Fcdr (oldstate);
1647 tem = Fcar (oldstate); /* elt 4, incomment */
1648 state.incomment = !NILP (tem);
1650 oldstate = Fcdr (oldstate);
1651 tem = Fcar (oldstate); /* elt 5, follows-quote */
1652 start_quoted = !NILP (tem);
1654 /* if the eighth element of the list is nil, we are in comment style
1655 a; if it is t, we are in comment style b; if it is 'syntax-table,
1656 we are in a generic comment */
1657 oldstate = Fcdr (oldstate);
1658 oldstate = Fcdr (oldstate);
1659 tem = Fcar (oldstate); /* elt 7, comment style a/b/fence */
1660 state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table)
1661 ? ST_COMMENT_STYLE : 1 );
1663 oldstate = Fcdr (oldstate); /* elt 8, start of last comment/string */
1664 tem = Fcar (oldstate);
1665 state.comstr_start = NILP (tem) ? -1 : XINT (tem);
1667 /* elt 9, char numbers of starts-of-expression of levels
1668 (starting from outermost). */
1669 oldstate = Fcdr (oldstate);
1670 tem = Fcar (oldstate); /* elt 9, intermediate data for
1671 continuation of parsing (subject
1673 while (!NILP (tem)) /* >= second enclosing sexps. */
1675 curlevel->last = XINT (Fcar (tem));
1676 if (++curlevel == endlevel)
1677 error ("Nesting too deep for parser");
1678 curlevel->prev = -1;
1679 curlevel->last = -1;
1686 curlevel->prev = -1;
1687 curlevel->last = -1;
1689 /* Enter the loop at a place appropriate for initial state. */
1691 if (state.incomment) goto startincomment;
1692 if (state.instring >= 0)
1694 if (start_quoted) goto startquotedinstring;
1697 if (start_quoted) goto startquoted;
1706 UPDATE_SYNTAX_CACHE_FORWARD (from);
1707 c = BUF_FETCH_CHAR (buf, from);
1708 code = SYNTAX_FROM_CACHE (mirrortab, c);
1709 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
1712 /* record the comment style we have entered so that only the
1713 comment-ender sequence (or single char) of the same style
1714 actually terminates the comment section. */
1715 if (code == Scomment)
1718 SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
1719 == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1720 state.comstr_start = from - 1;
1723 /* a generic comment delimiter? */
1724 else if (code == Scomment_fence)
1726 state.comstyle = ST_COMMENT_STYLE;
1727 state.comstr_start = from - 1;
1731 else if (from < end &&
1732 SYNTAX_CODE_START_FIRST_P (syncode))
1735 UPDATE_SYNTAX_CACHE_FORWARD (from);
1737 SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from));
1739 if (SYNTAX_CODES_START_P (syncode, next_syncode))
1742 state.comstyle = SYNTAX_CODES_COMMENT_MASK_START
1743 (syncode, next_syncode) == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
1744 state.comstr_start = from - 1;
1746 UPDATE_SYNTAX_CACHE_FORWARD (from);
1750 if (SYNTAX_CODE_PREFIX (syncode))
1756 if (stopbefore) goto stop; /* this arg means stop at sexp start */
1757 curlevel->last = from - 1;
1759 if (from == end) goto endquoted;
1762 /* treat following character as a word constituent */
1765 if (stopbefore) goto stop; /* this arg means stop at sexp start */
1766 curlevel->last = from - 1;
1770 UPDATE_SYNTAX_CACHE_FORWARD (from);
1771 switch (SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from)))
1776 if (from == end) goto endquoted;
1788 curlevel->prev = curlevel->last;
1792 state.incomment = 1;
1793 if (commentstop || boundary_stop) goto done;
1795 if (commentstop == 1)
1797 UPDATE_SYNTAX_CACHE_FORWARD (from);
1799 Bufpos newfrom = find_end_of_comment (buf, from, end, state.comstyle);
1802 /* we terminated search because from == end */
1808 state.incomment = 0;
1809 state.comstyle = 0; /* reset the comment style */
1810 if (boundary_stop) goto done;
1814 if (stopbefore) goto stop; /* this arg means stop at sexp start */
1816 /* curlevel++->last ran into compiler bug on Apollo */
1817 curlevel->last = from - 1;
1818 if (++curlevel == endlevel)
1819 error ("Nesting too deep for parser");
1820 curlevel->prev = -1;
1821 curlevel->last = -1;
1822 if (targetdepth == depth) goto done;
1827 if (depth < mindepth)
1829 if (curlevel != levelstart)
1831 curlevel->prev = curlevel->last;
1832 if (targetdepth == depth) goto done;
1837 state.comstr_start = from - 1;
1838 if (stopbefore) goto stop; /* this arg means stop at sexp start */
1839 curlevel->last = from - 1;
1840 if (code == Sstring_fence)
1842 state.instring = ST_STRING_STYLE;
1846 /* XEmacs change: call syntax_match() on character */
1847 Emchar ch = BUF_FETCH_CHAR (buf, from - 1);
1848 Lisp_Object stermobj =
1849 syntax_match (syntax_cache.current_syntax_table, ch);
1851 if (CHARP (stermobj))
1852 state.instring = XCHAR (stermobj);
1854 state.instring = ch;
1856 if (boundary_stop) goto done;
1860 enum syntaxcode temp_code;
1862 if (from >= end) goto done;
1864 UPDATE_SYNTAX_CACHE_FORWARD (from);
1865 c = BUF_FETCH_CHAR (buf, from);
1866 temp_code = SYNTAX_FROM_CACHE (mirrortab, c);
1869 state.instring != ST_STRING_STYLE &&
1870 temp_code == Sstring &&
1871 c == state.instring) break;
1876 if (state.instring == ST_STRING_STYLE)
1883 startquotedinstring:
1884 if (from >= end) goto endquoted;
1893 state.instring = -1;
1894 curlevel->prev = curlevel->last;
1896 if (boundary_stop) goto done;
1906 case Scomment_fence:
1914 stop: /* Here if stopping before start of sexp. */
1915 from--; /* We have just fetched the char that starts it; */
1916 goto done; /* but return the position before it. */
1921 state.depth = depth;
1922 state.mindepth = mindepth;
1923 state.thislevelstart = curlevel->prev;
1924 state.prevlevelstart
1925 = (curlevel == levelstart) ? -1 : (curlevel - 1)->last;
1926 state.location = from;
1927 state.levelstarts = Qnil;
1928 while (--curlevel >= levelstart)
1929 state.levelstarts = Fcons (make_int (curlevel->last),
1935 DEFUN ("parse-partial-sexp", Fparse_partial_sexp, 2, 7, 0, /*
1936 Parse Lisp syntax starting at FROM until TO; return status of parse at TO.
1937 Parsing stops at TO or when certain criteria are met;
1938 point is set to where parsing stops.
1939 If fifth arg OLDSTATE is omitted or nil,
1940 parsing assumes that FROM is the beginning of a function.
1941 Value is a list of nine elements describing final state of parsing:
1943 1. character address of start of innermost containing list; nil if none.
1944 2. character address of start of last complete sexp terminated.
1945 3. non-nil if inside a string.
1946 (It is the character that will terminate the string,
1947 or t if the string should be terminated by an explicit
1948 `syntax-table' property.)
1949 4. t if inside a comment.
1950 5. t if following a quote character.
1951 6. the minimum paren-depth encountered during this scan.
1952 7. nil if in comment style a, or not in a comment; t if in comment style b;
1953 `syntax-table' if given by an explicit `syntax-table' property.
1954 8. character address of start of last comment or string; nil if none.
1955 9. Intermediate data for continuation of parsing (subject to change).
1956 If third arg TARGETDEPTH is non-nil, parsing stops if the depth
1957 in parentheses becomes equal to TARGETDEPTH.
1958 Fourth arg STOPBEFORE non-nil means stop when come to
1959 any character that starts a sexp.
1960 Fifth arg OLDSTATE is a nine-element list like what this function returns.
1961 It is used to initialize the state of the parse. Its second and third
1962 elements are ignored.
1963 Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. If it
1964 is `syntax-table', stop after the start of a comment or a string, or after
1965 the end of a comment or string.
1967 (from, to, targetdepth, stopbefore, oldstate, commentstop, buffer))
1969 struct lisp_parse_state state;
1972 struct buffer *buf = decode_buffer (buffer, 0);
1975 if (!NILP (targetdepth))
1977 CHECK_INT (targetdepth);
1978 target = XINT (targetdepth);
1981 target = -100000; /* We won't reach this depth */
1983 get_buffer_range_char (buf, from, to, &start, &end, 0);
1984 scan_sexps_forward (buf, &state, start, end,
1985 target, !NILP (stopbefore), oldstate,
1987 ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1)));
1988 BUF_SET_PT (buf, state.location);
1992 val = Fcons (state.levelstarts, val);
1993 val = Fcons ((state.incomment || (state.instring >= 0))
1994 ? make_int (state.comstr_start) : Qnil, val);
1995 val = Fcons (state.comstyle ? (state.comstyle == ST_COMMENT_STYLE
1996 ? Qsyntax_table : Qt) : Qnil, val);
1997 val = Fcons (make_int (state.mindepth), val);
1998 val = Fcons (state.quoted ? Qt : Qnil, val);
1999 val = Fcons (state.incomment ? Qt : Qnil, val);
2000 val = Fcons (state.instring < 0
2002 : (state.instring == ST_STRING_STYLE
2003 ? Qt : make_int (state.instring)), val);
2004 val = Fcons (state.thislevelstart < 0 ? Qnil : make_int (state.thislevelstart), val);
2005 val = Fcons (state.prevlevelstart < 0 ? Qnil : make_int (state.prevlevelstart), val);
2006 val = Fcons (make_int (state.depth), val);
2012 /* Updating of the mirror syntax table.
2014 Each syntax table has a corresponding mirror table in it.
2015 Whenever we make a change to a syntax table, we call
2016 update_syntax_table() on it.
2018 #### We really only need to map over the changed range.
2020 If we change the standard syntax table, we need to map over
2021 all tables because any of them could be inheriting from the
2022 standard syntax table.
2024 When `set-syntax-table' is called, we set the buffer's mirror
2025 syntax table as well.
2030 Lisp_Object mirrortab;
2035 cmst_mapfun (struct chartab_range *range, Lisp_Object val, void *arg)
2037 struct cmst_arg *closure = (struct cmst_arg *) arg;
2041 if (SYNTAX_FROM_CODE (XINT (val)) == Sinherit
2042 && closure->check_inherit)
2044 struct cmst_arg recursive;
2046 recursive.mirrortab = closure->mirrortab;
2047 recursive.check_inherit = 0;
2048 map_char_table (XCHAR_TABLE (Vstandard_syntax_table), range,
2049 cmst_mapfun, &recursive);
2052 put_char_table (XCHAR_TABLE (closure->mirrortab), range, val);
2058 update_just_this_syntax_table (Lisp_Char_Table *ct)
2060 struct chartab_range range;
2061 struct cmst_arg arg;
2063 arg.mirrortab = ct->mirror_table;
2064 arg.check_inherit = (CHAR_TABLEP (Vstandard_syntax_table)
2065 && ct != XCHAR_TABLE (Vstandard_syntax_table));
2066 range.type = CHARTAB_RANGE_ALL;
2067 map_char_table (ct, &range, cmst_mapfun, &arg);
2070 /* Called from chartab.c when a change is made to a syntax table.
2071 If this is the standard syntax table, we need to recompute
2072 *all* syntax tables (yuck). Otherwise we just recompute this
2076 update_syntax_table (Lisp_Char_Table *ct)
2078 /* Don't be stymied at startup. */
2079 if (CHAR_TABLEP (Vstandard_syntax_table)
2080 && ct == XCHAR_TABLE (Vstandard_syntax_table))
2084 for (syntab = Vall_syntax_tables; !NILP (syntab);
2085 syntab = XCHAR_TABLE (syntab)->next_table)
2086 update_just_this_syntax_table (XCHAR_TABLE (syntab));
2089 update_just_this_syntax_table (ct);
2094 /************************************************************************/
2095 /* initialization */
2096 /************************************************************************/
2099 syms_of_syntax (void)
2101 defsymbol (&Qsyntax_table_p, "syntax-table-p");
2102 defsymbol (&Qsyntax_table, "syntax-table");
2104 DEFSUBR (Fsyntax_table_p);
2105 DEFSUBR (Fsyntax_table);
2106 DEFSUBR (Fstandard_syntax_table);
2107 DEFSUBR (Fcopy_syntax_table);
2108 DEFSUBR (Fset_syntax_table);
2109 DEFSUBR (Fsyntax_designator_chars);
2110 DEFSUBR (Fchar_syntax);
2111 DEFSUBR (Fmatching_paren);
2112 /* DEFSUBR (Fmodify_syntax_entry); now in Lisp. */
2113 /* DEFSUBR (Fdescribe_syntax); now in Lisp. */
2115 DEFSUBR (Fforward_word);
2117 DEFSUBR (Fforward_comment);
2118 DEFSUBR (Fscan_lists);
2119 DEFSUBR (Fscan_sexps);
2120 DEFSUBR (Fbackward_prefix_chars);
2121 DEFSUBR (Fparse_partial_sexp);
2125 vars_of_syntax (void)
2127 DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments /*
2128 Non-nil means `forward-sexp', etc., should treat comments as whitespace.
2130 parse_sexp_ignore_comments = 0;
2132 DEFVAR_BOOL ("lookup-syntax-properties", &lookup_syntax_properties /*
2133 Non-nil means `forward-sexp', etc., grant `syntax-table' property.
2134 The value of this property should be either a syntax table, or a cons
2135 of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric
2136 syntax code, MATCHCHAR being nil or the character to match (which is
2137 relevant only for open/close type.
2139 lookup_syntax_properties = 1;
2141 DEFVAR_BOOL ("words-include-escapes", &words_include_escapes /*
2142 Non-nil means `forward-word', etc., should treat escape chars part of words.
2144 words_include_escapes = 0;
2146 no_quit_in_re_search = 0;
2150 define_standard_syntax (const char *p, enum syntaxcode syn)
2153 Fput_char_table (make_char (*p), make_int (syn), Vstandard_syntax_table);
2157 complex_vars_of_syntax (void)
2161 /* Set this now, so first buffer creation can refer to it. */
2162 /* Make it nil before calling copy-syntax-table
2163 so that copy-syntax-table will know not to try to copy from garbage */
2164 Vstandard_syntax_table = Qnil;
2165 Vstandard_syntax_table = Fcopy_syntax_table (Qnil);
2166 staticpro (&Vstandard_syntax_table);
2168 Vsyntax_designator_chars_string = make_string_nocopy (syntax_code_spec,
2170 staticpro (&Vsyntax_designator_chars_string);
2172 fill_char_table (XCHAR_TABLE (Vstandard_syntax_table), make_int (Spunct));
2174 for (i = 0; i <= 32; i++) /* Control 0 plus SPACE */
2175 Fput_char_table (make_char (i), make_int (Swhitespace),
2176 Vstandard_syntax_table);
2177 for (i = 127; i <= 159; i++) /* DEL plus Control 1 */
2178 Fput_char_table (make_char (i), make_int (Swhitespace),
2179 Vstandard_syntax_table);
2181 define_standard_syntax ("abcdefghijklmnopqrstuvwxyz"
2182 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
2185 define_standard_syntax ("\"", Sstring);
2186 define_standard_syntax ("\\", Sescape);
2187 define_standard_syntax ("_-+*/&|<>=", Ssymbol);
2188 define_standard_syntax (".,;:?!#@~^'`", Spunct);
2190 for (p = "()[]{}"; *p; p+=2)
2192 Fput_char_table (make_char (p[0]),
2193 Fcons (make_int (Sopen), make_char (p[1])),
2194 Vstandard_syntax_table);
2195 Fput_char_table (make_char (p[1]),
2196 Fcons (make_int (Sclose), make_char (p[0])),
2197 Vstandard_syntax_table);