--- /dev/null
+/* XEmacs routines to deal with syntax tables; also word and list parsing.
+ Copyright (C) 1985-1994 Free Software Foundation, Inc.
+ Copyright (C) 1995 Sun Microsystems, Inc.
+
+This file is part of XEmacs.
+
+XEmacs is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 2, or (at your option) any
+later version.
+
+XEmacs is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with XEmacs; see the file COPYING. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA. */
+
+/* Synched up with: FSF 19.28. */
+
+/* This file has been Mule-ized. */
+
+#include <config.h>
+#include "lisp.h"
+
+#include "buffer.h"
+#include "syntax.h"
+#include "extents.h"
+
+/* Here is a comment from Ken'ichi HANDA <handa@etl.go.jp>
+ explaining the purpose of the Sextword syntax category:
+
+Japanese words are not separated by spaces, which makes finding word
+boundaries very difficult. Theoretically it's impossible without
+using natural language processing techniques. But, by defining
+pseudo-words as below (much simplified for letting you understand it
+easily) for Japanese, we can have a convenient forward-word function
+for Japanese.
+
+ A Japanese word is a sequence of characters that consists of
+ zero or more Kanji characters followed by zero or more
+ Hiragana characters.
+
+Then, the problem is that now we can't say that a sequence of
+word-constituents makes up a WORD. For instance, both Hiragana "A"
+and Kanji "KAN" are word-constituents but the sequence of these two
+letters can't be a single word.
+
+So, we introduced Sextword for Japanese letters. A character of
+Sextword is a word-constituent but a word boundary may exist between
+two such characters. */
+
+/* Mule 2.4 doesn't seem to have Sextword - I'm removing it -- mrb */
+/* Recovered by tomo */
+
+#define ST_COMMENT_STYLE 0x101
+#define ST_STRING_STYLE 0x102
+
+Lisp_Object Qsyntax_table;
+int lookup_syntax_properties;
+
+Lisp_Object Qsyntax_table_p;
+
+int words_include_escapes;
+
+int parse_sexp_ignore_comments;
+
+/* The following two variables are provided to tell additional information
+ to the regex routines. We do it this way rather than change the
+ arguments to re_search_2() in an attempt to maintain some call
+ compatibility with other versions of the regex code. */
+
+/* Tell the regex routines not to QUIT. Normally there is a QUIT
+ each iteration in re_search_2(). */
+int no_quit_in_re_search;
+
+/* Tell the regex routines which buffer to access for SYNTAX() lookups
+ and the like. */
+struct buffer *regex_emacs_buffer;
+
+/* In Emacs, this is the string or buffer in which we
+ are matching. It is used for looking up syntax properties. */
+Lisp_Object regex_match_object;
+
+Lisp_Object Vstandard_syntax_table;
+
+Lisp_Object Vsyntax_designator_chars_string;
+
+/* This is the internal form of the parse state used in parse-partial-sexp. */
+
+struct lisp_parse_state
+{
+ int depth; /* Depth at end of parsing */
+ Emchar instring; /* -1 if not within string, else desired terminator */
+ int incomment; /* Nonzero if within a comment at end of parsing */
+ int comstyle; /* comment style a=0, or b=1, or ST_COMMENT_STYLE */
+ int quoted; /* Nonzero if just after an escape char at end of
+ parsing */
+ Bufpos thislevelstart;/* Char number of most recent start-of-expression
+ at current level */
+ Bufpos prevlevelstart;/* Char number of start of containing expression */
+ Bufpos location; /* Char number at which parsing stopped */
+ int mindepth; /* Minimum depth seen while scanning */
+ Bufpos comstr_start; /* Position just after last comment/string starter
+ (if the 'syntax-table text property is not
+ supported, used only for comment starts) */
+ Lisp_Object levelstarts; /* Char numbers of starts-of-expression
+ of levels (starting from outermost). */
+};
+\f
+/* These variables are a cache for finding the start of a defun.
+ find_start_pos is the place for which the defun start was found.
+ find_start_value is the defun start position found for it.
+ find_start_buffer is the buffer it was found in.
+ find_start_begv is the BEGV value when it was found.
+ find_start_modiff is the value of MODIFF when it was found. */
+
+static Bufpos find_start_pos;
+static Bufpos find_start_value;
+static struct buffer *find_start_buffer;
+static Bufpos find_start_begv;
+static int find_start_modiff;
+
+/* Find a defun-start that is the last one before POS (or nearly the last).
+ We record what we find, so that another call in the same area
+ can return the same value right away. */
+
+static Bufpos
+find_defun_start (struct buffer *buf, Bufpos pos)
+{
+ Bufpos tem;
+
+ /* Use previous finding, if it's valid and applies to this inquiry. */
+ if (buf == find_start_buffer
+ /* Reuse the defun-start even if POS is a little farther on.
+ POS might be in the next defun, but that's ok.
+ Our value may not be the best possible, but will still be usable. */
+ && pos <= find_start_pos + 1000
+ && pos >= find_start_value
+ && BUF_BEGV (buf) == find_start_begv
+ && BUF_MODIFF (buf) == find_start_modiff)
+ return find_start_value;
+
+ /* Back up to start of line. */
+ tem = find_next_newline (buf, pos, -1);
+
+ SCS_STATISTICS_SET_FUNCTION (scs_find_defun_start);
+ SETUP_SYNTAX_CACHE (tem, 1);
+ while (tem > BUF_BEGV (buf))
+ {
+ UPDATE_SYNTAX_CACHE_BACKWARD(tem);
+
+ /* Open-paren at start of line means we found our defun-start. */
+ if (SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, tem)) == Sopen)
+ break;
+ /* Move to beg of previous line. */
+ tem = find_next_newline (buf, tem, -2);
+ }
+
+ /* Record what we found, for the next try. */
+ find_start_value = tem;
+ find_start_buffer = buf;
+ find_start_modiff = BUF_MODIFF (buf);
+ find_start_begv = BUF_BEGV (buf);
+ find_start_pos = pos;
+
+ return find_start_value;
+}
+\f
+DEFUN ("syntax-table-p", Fsyntax_table_p, 1, 1, 0, /*
+Return t if OBJECT is a syntax table.
+Any vector of 256 elements will do.
+*/
+ (object))
+{
+ return (CHAR_TABLEP (object)
+ && XCHAR_TABLE_TYPE (object) == CHAR_TABLE_TYPE_SYNTAX)
+ ? Qt : Qnil;
+}
+
+static Lisp_Object
+check_syntax_table (Lisp_Object obj, Lisp_Object default_)
+{
+ if (NILP (obj))
+ obj = default_;
+ while (NILP (Fsyntax_table_p (obj)))
+ obj = wrong_type_argument (Qsyntax_table_p, obj);
+ return obj;
+}
+
+DEFUN ("syntax-table", Fsyntax_table, 0, 1, 0, /*
+Return the current syntax table.
+This is the one specified by the current buffer, or by BUFFER if it
+is non-nil.
+*/
+ (buffer))
+{
+ return decode_buffer (buffer, 0)->syntax_table;
+}
+
+DEFUN ("standard-syntax-table", Fstandard_syntax_table, 0, 0, 0, /*
+Return the standard syntax table.
+This is the one used for new buffers.
+*/
+ ())
+{
+ return Vstandard_syntax_table;
+}
+
+DEFUN ("copy-syntax-table", Fcopy_syntax_table, 0, 1, 0, /*
+Return a new syntax table which is a copy of SYNTAX-TABLE.
+SYNTAX-TABLE defaults to the standard syntax table.
+*/
+ (syntax_table))
+{
+ if (NILP (Vstandard_syntax_table))
+ return Fmake_char_table (Qsyntax);
+
+ syntax_table = check_syntax_table (syntax_table, Vstandard_syntax_table);
+ return Fcopy_char_table (syntax_table);
+}
+
+DEFUN ("set-syntax-table", Fset_syntax_table, 1, 2, 0, /*
+Select SYNTAX-TABLE as the new syntax table for BUFFER.
+BUFFER defaults to the current buffer if omitted.
+*/
+ (syntax_table, buffer))
+{
+ struct buffer *buf = decode_buffer (buffer, 0);
+ syntax_table = check_syntax_table (syntax_table, Qnil);
+ buf->syntax_table = syntax_table;
+ buf->mirror_syntax_table = XCHAR_TABLE (syntax_table)->mirror_table;
+ /* Indicate that this buffer now has a specified syntax table. */
+ buf->local_var_flags |= XINT (buffer_local_flags.syntax_table);
+ return syntax_table;
+}
+\f
+/* The current syntax state */
+struct syntax_cache syntax_cache;
+
+
+/*
+ Update syntax_cache to an appropriate setting for position POS
+
+ The sign of COUNT gives the relative position of POS wrt the
+ previously valid interval. (not currently used)
+
+ `syntax_cache.*_change' are the next and previous positions at
+ which syntax_code and c_s_t will need to be recalculated.
+
+ #### Currently this code uses 'get-char-property', which will
+ return the "last smallest" extent at a given position. In cases
+ where overlapping extents are defined, this code will simply use
+ whatever is returned by get-char-property.
+
+ It might be worth it at some point to merge provided syntax tables
+ outward to the current buffer.
+
+ sjt sez:
+ This implementation has to rather inefficient, since it looks at
+ next-extent-change, and a heavily font-locked buffer will be rife
+ with irrelevant extents. We could do a sledgehammer check on this
+ by looking at the distribution of extent lengths. Also count up
+ cache hits and misses.
+
+ If we assume that syntax-table is a _text_ property (which also
+ deals with the issue of overlapping syntax-table properties), then
+ the following strategy recommends itself
+ o give the syntax cache a `valid' flag, to be reset whenever a
+ syntax-table property is added, changed, or removed; this could
+ be done by setting syntax_cache's prev_change > next_change
+ (but not compatible with using extents/markers here); if it's a
+ Lisp variable, doing it in Lisp shouldn't be too inefficient
+ o lazily initialize the cache whenever the object being examined
+ differs from the object the cache currently refers to
+ o by using {previous,next-single-property-change} we should be
+ able to get much bigger cache intervals (in most cases, the
+ whole buffer)
+ o cache markers instead of positions so the mere insertion or
+ deletion of text doesn't invalidate the cache, only if it
+ involves a syntax-table property (we could also cache the
+ extents carrying the syntax-table text-property; that gives us
+ another check for invalid cache).
+
+ If I understand this correctly, we need to invalidate the cache in the
+ following cases:
+ o If the referenced object changes (it's a global cache)
+ o If there are insertions or deletions of text (the positions are
+ absolute; fix: use markers or an extent instead?)
+ o If the syntax-table property is altered == added and different or
+ removed and the same (fix: probably computable from range overlap,
+ but is it worth it? would interact with ins/del); this includes
+ detachment of extents with the same value (but only the boundary
+ extents, as otherwise the range coalesces across the deletion point)
+ and attachment of extents with a different value
+ Note: the above looks a lot like what Ben has implemented in 21.5, but
+ he goes one better by making the cache buffer-local.
+
+ Note: cperl mode uses the text property API, not extents/overlays.
+*/
+
+#ifdef SYNTAX_CACHE_STATISTICS
+struct syntax_cache_statistics scs_statistics =
+ { 0, 0, 0, 0, -1, -1, 0.0, 0.0, scs_no_function};
+
+char* syntax_cache_statistics_function_names[scs_number_of_functions] = {
+ "find_context",
+ "find_defun_start",
+ "scan_words",
+ "Fforward_comment",
+ "scan_lists",
+ "Fbackward_prefix_characters",
+ "scan_sexps_forward"
+};
+#endif /* SYNTAX_CACHE_STATISTICS */
+
+void
+update_syntax_cache (int pos, int count)
+{
+ Lisp_Object tmp_table;
+
+#ifdef SYNTAX_CACHE_STATISTICS
+ if (scs_statistics.total_updates == 0)
+ {
+ int i;
+ for (i = 0; i < scs_number_of_functions; ++i)
+ scs_statistics.functions[i] = 0;
+ }
+ if (syntax_cache.prev_change > syntax_cache.next_change)
+ scs_statistics.inits++;
+ else if (pos < syntax_cache.prev_change)
+ scs_statistics.misses_lo++;
+ else if (pos >= syntax_cache.next_change)
+ scs_statistics.misses_hi++;
+#endif /* SYNTAX_CACHE_STATISTICS */
+
+ /* #### Since font-lock undoes any narrowing, maybe the BUF_ZV and
+ BUF_BEGV below should be BUF_Z and BUF_BEG respectively? */
+ if (BUFFERP (syntax_cache.object))
+ {
+ int get_change_before = pos + 1;
+
+ tmp_table = Fget_char_property (make_int(pos), Qsyntax_table,
+ syntax_cache.object, Qnil);
+#if NEXT_SINGLE_PROPERTY_CHANGE
+ /* #### shouldn't we be using BUF_BEGV here? */
+ syntax_cache.next_change =
+ XINT (Fnext_single_property_change
+ (make_int (pos > 0 ? pos : 1), Qsyntax_table,
+ syntax_cache.object, make_int (BUF_ZV (syntax_cache.buffer))));
+#else
+ syntax_cache.next_change =
+ XINT (Fnext_extent_change (make_int (pos > 0 ? pos : 1),
+ syntax_cache.object));
+#endif
+
+ /* #### shouldn't we be using BUF_BEGV here? */
+ if (get_change_before < 1)
+ get_change_before = 1;
+ else if (get_change_before > BUF_ZV (syntax_cache.buffer))
+ get_change_before = BUF_ZV (syntax_cache.buffer);
+
+#if PREVIOUS_SINGLE_PROPERTY_CHANGE
+ /* #### shouldn't we be using BUF_BEGV here? */
+ syntax_cache.prev_change =
+ XINT (Fprevious_single_property_change
+ (make_int (get_change_before), Qsyntax_table,
+ syntax_cache.object, make_int(1)));
+#else
+ syntax_cache.prev_change =
+ XINT (Fprevious_extent_change (make_int (get_change_before),
+ syntax_cache.object));
+#endif
+ }
+ else if (STRINGP (syntax_cache.object))
+ {
+ int get_change_before = pos + 1;
+
+ tmp_table = Fget_char_property (make_int(pos), Qsyntax_table,
+ syntax_cache.object, Qnil);
+#if NEXT_SINGLE_PROPERTY_CHANGE
+ /* #### shouldn't we be using BUF_BEGV here? */
+ syntax_cache.next_change =
+ XINT (Fnext_single_property_change
+ (make_int (pos >= 0 ? pos : 0), Qsyntax_table,
+ syntax_cache.object,
+ make_int(XSTRING_LENGTH(syntax_cache.object))));
+#else
+ syntax_cache.next_change =
+ XINT (Fnext_extent_change (make_int (pos >= 0 ? pos : 0),
+ syntax_cache.object));
+#endif
+
+ if (get_change_before < 0)
+ get_change_before = 0;
+ else if (get_change_before > XSTRING_LENGTH(syntax_cache.object))
+ get_change_before = XSTRING_LENGTH(syntax_cache.object);
+
+#if PREVIOUS_SINGLE_PROPERTY_CHANGE
+ syntax_cache.prev_change =
+ XINT (Fprevious_single_property_change
+ (make_int (get_change_before), Qsyntax_table,
+ syntax_cache.object, make_int(0)));
+#else
+ syntax_cache.prev_change =
+ XINT (Fprevious_extent_change (make_int (get_change_before),
+ syntax_cache.object));
+#endif
+ }
+ else
+ {
+ tmp_table = Qnil; /* silence compiler */
+ /* Always ABORTs. #### Is there another sensible thing to do here? */
+ assert (BUFFERP (syntax_cache.object) || STRINGP (syntax_cache.object));
+ }
+
+ if (EQ (Fsyntax_table_p (tmp_table), Qt))
+ {
+ syntax_cache.use_code = 0;
+ syntax_cache.current_syntax_table =
+ XCHAR_TABLE (tmp_table)->mirror_table;
+ }
+ else if (CONSP (tmp_table) && INTP (XCAR (tmp_table)))
+ {
+ syntax_cache.use_code = 1;
+ syntax_cache.syntax_code = (enum syntaxcode) XINT (XCAR (tmp_table));
+ }
+ else
+ {
+ syntax_cache.use_code = 0;
+ syntax_cache.current_syntax_table =
+ syntax_cache.buffer->mirror_syntax_table;
+ }
+
+#ifdef SYNTAX_CACHE_STATISTICS
+ {
+ int length = syntax_cache.next_change - syntax_cache.prev_change;
+ int misses = scs_statistics.misses_lo +
+ scs_statistics.misses_hi + scs_statistics.inits;
+
+ if (scs_statistics.min_length == -1 || scs_statistics.min_length > length)
+ scs_statistics.min_length = length;
+ if (scs_statistics.max_length == -1 || scs_statistics.max_length < length)
+ scs_statistics.max_length = length;
+ scs_statistics.mean_length_on_miss =
+ ((misses - 1) * scs_statistics.mean_length_on_miss + length) / misses;
+ }
+
+ scs_statistics.mean_length
+ = scs_statistics.total_updates*scs_statistics.mean_length
+ + syntax_cache.next_change - syntax_cache.prev_change;
+ scs_statistics.total_updates++;
+ scs_statistics.mean_length /= scs_statistics.total_updates;
+
+ if (scs_statistics.this_function != scs_no_function)
+ {
+ scs_statistics.functions[scs_statistics.this_function]++;
+ scs_statistics.this_function = scs_no_function;
+ }
+
+ if (!(scs_statistics.total_updates % SYNTAX_CACHE_STATISTICS_REPORT_INTERVAL))
+ {
+ fprintf (stderr, "Syntax cache stats:\n ");
+ fprintf (stderr, "updates %d, inits %d, misses low %d, misses high %d,",
+ scs_statistics.total_updates, scs_statistics.inits,
+ scs_statistics.misses_lo, scs_statistics.misses_hi);
+ fprintf (stderr, "\n ");
+
+#define REPORT_FUNCTION(i) \
+ fprintf (stderr, " %s %d,", \
+ syntax_cache_statistics_function_names[i], \
+ scs_statistics.functions[i]);
+
+ REPORT_FUNCTION(scs_find_context);
+ REPORT_FUNCTION(scs_find_defun_start);
+ REPORT_FUNCTION(scs_scan_words);
+ REPORT_FUNCTION(scs_Fforward_comment);
+ fprintf (stderr, "\n ");
+ REPORT_FUNCTION(scs_scan_lists);
+ REPORT_FUNCTION(scs_Fbackward_prefix_characters);
+ REPORT_FUNCTION(scs_scan_sexps_forward);
+#undef REPORT_FUNCTION
+
+ fprintf (stderr, "\n min length %d, max length %d,",
+ scs_statistics.min_length, scs_statistics.max_length);
+ fprintf (stderr, "\n mean length %.1f, mean length on miss %.1f\n",
+ scs_statistics.mean_length,
+ scs_statistics.mean_length_on_miss);
+ }
+#endif /* SYNTAX_CACHE_STATISTICS */
+}
+
+\f
+/* Convert a letter which signifies a syntax code
+ into the code it signifies.
+ This is used by modify-syntax-entry, and other things. */
+
+const unsigned char syntax_spec_code[0400] =
+{ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ (char) Swhitespace, 0377, (char) Sstring, 0377,
+ (char) Smath, 0377, 0377, (char) Squote,
+ (char) Sopen, (char) Sclose, 0377, 0377,
+ 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377,
+ (char) Scomment, 0377, (char) Sendcomment, 0377,
+ (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
+ 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* `, a, ... */
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
+ 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
+ 0377, 0377, 0377, 0377, (char) Sstring_fence, 0377, 0377, 0377
+};
+
+const unsigned char syntax_code_spec[] = " .w_()'\"$\\/<>@!|";
+
+DEFUN ("syntax-designator-chars", Fsyntax_designator_chars, 0, 0, 0, /*
+Return a string of the recognized syntax designator chars.
+The chars are ordered by their internal syntax codes, which are
+numbered starting at 0.
+*/
+ ())
+{
+ return Vsyntax_designator_chars_string;
+}
+
+DEFUN ("char-syntax", Fchar_syntax, 1, 2, 0, /*
+Return the syntax code of CHARACTER, described by a character.
+For example, if CHARACTER is a word constituent,
+the character `?w' is returned.
+The characters that correspond to various syntax codes
+are listed in the documentation of `modify-syntax-entry'.
+Optional second argument SYNTAX-TABLE defaults to the current buffer's
+syntax table.
+*/
+ (character, syntax_table))
+{
+ Lisp_Char_Table *mirrortab;
+
+ if (NILP (character))
+ {
+ character = make_char ('\000');
+ }
+ CHECK_CHAR_COERCE_INT (character);
+ syntax_table = check_syntax_table (syntax_table, current_buffer->syntax_table);
+ mirrortab = XCHAR_TABLE (XCHAR_TABLE (syntax_table)->mirror_table);
+ return make_char (syntax_code_spec[(int) SYNTAX (mirrortab, XCHAR (character))]);
+}
+
+#ifdef MULE
+
+enum syntaxcode
+charset_syntax (struct buffer *buf, Lisp_Object charset, int *multi_p_out)
+{
+ *multi_p_out = 1;
+ /* #### get this right */
+ return Spunct;
+}
+
+#endif
+
+Lisp_Object
+syntax_match (Lisp_Object syntax_table, Emchar ch)
+{
+ Lisp_Object code = XCHAR_TABLE_VALUE_UNSAFE (syntax_table, ch);
+ Lisp_Object code2 = code;
+
+ if (CONSP (code))
+ code2 = XCAR (code);
+ if (SYNTAX_FROM_CODE (XINT (code2)) == Sinherit)
+ code = XCHAR_TABLE_VALUE_UNSAFE (Vstandard_syntax_table, ch);
+
+ return CONSP (code) ? XCDR (code) : Qnil;
+}
+
+DEFUN ("matching-paren", Fmatching_paren, 1, 2, 0, /*
+Return the matching parenthesis of CHARACTER, or nil if none.
+Optional second argument SYNTAX-TABLE defaults to the current buffer's
+syntax table.
+*/
+ (character, syntax_table))
+{
+ Lisp_Char_Table *mirrortab;
+ int code;
+
+ CHECK_CHAR_COERCE_INT (character);
+ syntax_table = check_syntax_table (syntax_table, current_buffer->syntax_table);
+ mirrortab = XCHAR_TABLE (XCHAR_TABLE (syntax_table)->mirror_table);
+ code = SYNTAX (mirrortab, XCHAR (character));
+ if (code == Sopen || code == Sclose || code == Sstring)
+ return syntax_match (syntax_table, XCHAR (character));
+ return Qnil;
+}
+
+\f
+
+#ifdef MULE
+/* Return 1 if there is a word boundary between two word-constituent
+ characters C1 and C2 if they appear in this order, else return 0.
+ There is no word boundary between two word-constituent ASCII
+ characters. */
+#define WORD_BOUNDARY_P(c1, c2) \
+ (!(CHAR_ASCII_P (c1) && CHAR_ASCII_P (c2)) \
+ && word_boundary_p (c1, c2))
+
+extern int word_boundary_p (Emchar c1, Emchar c2);
+#endif
+
+/* Return the position across COUNT words from FROM.
+ If that many words cannot be found before the end of the buffer, return 0.
+ COUNT negative means scan backward and stop at word beginning. */
+
+Bufpos
+scan_words (struct buffer *buf, Bufpos from, int count)
+{
+ Bufpos limit = count > 0 ? BUF_ZV (buf) : BUF_BEGV (buf);
+ Emchar ch0, ch1;
+ enum syntaxcode code;
+
+ SCS_STATISTICS_SET_FUNCTION (scs_scan_words);
+ SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, from, count);
+
+ /* #### is it really worth it to hand expand both cases? JV */
+ while (count > 0)
+ {
+ QUIT;
+
+ while (1)
+ {
+ if (from == limit)
+ return 0;
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ ch0 = BUF_FETCH_CHAR (buf, from);
+ code = SYNTAX_FROM_CACHE (mirrortab, ch0);
+
+ from++;
+ if (words_include_escapes
+ && (code == Sescape || code == Scharquote))
+ break;
+ if (code == Sword)
+ break;
+ }
+
+ QUIT;
+
+ while (from != limit)
+ {
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ ch1 = BUF_FETCH_CHAR (buf, from);
+ code = SYNTAX_FROM_CACHE (mirrortab, ch1);
+ if (!(words_include_escapes
+ && (code == Sescape || code == Scharquote)))
+ if (code != Sword
+#ifdef MULE
+ || WORD_BOUNDARY_P (ch0, ch1)
+#endif
+ )
+ break;
+#ifdef MULE
+ ch0 = ch1;
+#endif
+ from++;
+ }
+ count--;
+ }
+
+ while (count < 0)
+ {
+ QUIT;
+
+ while (1)
+ {
+ if (from == limit)
+ return 0;
+
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ ch1 = BUF_FETCH_CHAR (buf, from - 1);
+ code = SYNTAX_FROM_CACHE (mirrortab, ch1);
+ from--;
+
+ if (words_include_escapes
+ && (code == Sescape || code == Scharquote))
+ break;
+ if (code == Sword)
+ break;
+ }
+
+ QUIT;
+
+ while (from != limit)
+ {
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ ch0 = BUF_FETCH_CHAR (buf, from - 1);
+ code = SYNTAX_FROM_CACHE (mirrortab, ch0);
+
+ if (!(words_include_escapes
+ && (code == Sescape || code == Scharquote)))
+ if (code != Sword
+#ifdef MULE
+ || WORD_BOUNDARY_P (ch0, ch1)
+#endif
+ )
+ break;
+#ifdef MULE
+ ch1 = ch0;
+#endif
+ from--;
+ }
+ count++;
+ }
+
+ return from;
+}
+
+DEFUN ("forward-word", Fforward_word, 0, 2, "_p", /*
+Move point forward COUNT words (backward if COUNT is negative).
+Normally t is returned, but if an edge of the buffer is reached,
+point is left there and nil is returned.
+
+The characters that are moved over may be added to the current selection
+\(i.e. active region) if the Shift key is held down, a motion key is used
+to invoke this command, and `shifted-motion-keys-select-region' is t; see
+the documentation for this variable for more details.
+
+COUNT defaults to 1, and BUFFER defaults to the current buffer.
+*/
+ (count, buffer))
+{
+ Bufpos val;
+ struct buffer *buf = decode_buffer (buffer, 0);
+ EMACS_INT n;
+
+ if (NILP (count))
+ n = 1;
+ else
+ {
+ CHECK_INT (count);
+ n = XINT (count);
+ }
+
+ val = scan_words (buf, BUF_PT (buf), n);
+ if (val)
+ {
+ BUF_SET_PT (buf, val);
+ return Qt;
+ }
+ else
+ {
+ BUF_SET_PT (buf, n > 0 ? BUF_ZV (buf) : BUF_BEGV (buf));
+ return Qnil;
+ }
+}
+\f
+static void scan_sexps_forward (struct buffer *buf,
+ struct lisp_parse_state *,
+ Bufpos from, Bufpos end,
+ int targetdepth, int stopbefore,
+ Lisp_Object oldstate,
+ int commentstop);
+
+static int
+find_start_of_comment (struct buffer *buf, Bufpos from, Bufpos stop,
+ int comstyle)
+{
+ Emchar c;
+ enum syntaxcode code;
+
+ /* Look back, counting the parity of string-quotes,
+ and recording the comment-starters seen.
+ When we reach a safe place, assume that's not in a string;
+ then step the main scan to the earliest comment-starter seen
+ an even number of string quotes away from the safe place.
+
+ OFROM[I] is position of the earliest comment-starter seen
+ which is I+2X quotes from the comment-end.
+ PARITY is current parity of quotes from the comment end. */
+ int parity = 0;
+ Emchar my_stringend = 0;
+ int string_lossage = 0;
+ Bufpos comment_end = from;
+ Bufpos comstart_pos = 0;
+ int comstart_parity = 0;
+ int styles_match_p = 0;
+ /* mask to match comment styles against; for ST_COMMENT_STYLE, this
+ will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */
+ int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A;
+
+ /* At beginning of range to scan, we're outside of strings;
+ that determines quote parity to the comment-end. */
+ while (from != stop)
+ {
+ int syncode;
+
+ /* Move back and examine a character. */
+ from--;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+
+ /* is this a 1-char comment end sequence? if so, try
+ to see if style matches previously extracted mask */
+ if (code == Sendcomment)
+ {
+ /* MT had SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) & mask
+ but (as a Boolean) that's just a complicated way to write: */
+ styles_match_p = SYNTAX_CODE_MATCHES_1CHAR_P (syncode, mask);
+ }
+
+ /* or are we looking at a 1-char comment start sequence
+ of the style matching mask? */
+ else if (code == Scomment)
+ {
+ styles_match_p = SYNTAX_CODE_MATCHES_1CHAR_P (syncode, mask);
+ }
+
+ /* otherwise, is this a 2-char comment end or start sequence? */
+ else if (from > stop)
+ do
+ {
+ /* 2-char comment end sequence? */
+ if (SYNTAX_CODE_END_SECOND_P (syncode))
+ {
+ int prev_syncode;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ prev_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from - 1));
+
+ if (SYNTAX_CODES_END_P (prev_syncode, syncode))
+ {
+ code = Sendcomment;
+ styles_match_p =
+ SYNTAX_CODES_MATCH_END_P (prev_syncode, syncode, mask);
+ from--;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+
+ /* Found a comment-end sequence, so skip past the
+ check for a comment-start */
+ break;
+ }
+ }
+
+ /* 2-char comment start sequence? */
+ if (SYNTAX_CODE_START_SECOND_P (syncode))
+ {
+ int prev_syncode;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ prev_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from - 1));
+
+ if (SYNTAX_CODES_START_P (prev_syncode, syncode))
+ {
+ code = Scomment;
+ styles_match_p =
+ SYNTAX_CODES_MATCH_START_P (prev_syncode, syncode, mask);
+ from--;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ }
+ }
+ } while (0);
+
+ /* Ignore escaped characters. */
+ if (char_quoted (buf, from))
+ continue;
+
+ /* Track parity of quotes. */
+ if (code == Sstring)
+ {
+ parity ^= 1;
+ if (my_stringend == 0)
+ my_stringend = c;
+ /* If we have two kinds of string delimiters.
+ There's no way to grok this scanning backwards. */
+ else if (my_stringend != c)
+ string_lossage = 1;
+ }
+
+ if (code == Sstring_fence || code == Scomment_fence)
+ {
+ parity ^= 1;
+ if (my_stringend == 0)
+ my_stringend =
+ code == Sstring_fence ? ST_STRING_STYLE : ST_COMMENT_STYLE;
+ /* If we have two kinds of string delimiters.
+ There's no way to grok this scanning backwards. */
+ else if (my_stringend != (code == Sstring_fence
+ ? ST_STRING_STYLE : ST_COMMENT_STYLE))
+ string_lossage = 1;
+ }
+
+ /* Record comment-starters according to that
+ quote-parity to the comment-end. */
+ if (code == Scomment && styles_match_p)
+ {
+ comstart_parity = parity;
+ comstart_pos = from;
+ }
+
+ /* If we find another earlier comment-ender,
+ any comment-starts earlier than that don't count
+ (because they go with the earlier comment-ender). */
+ if (code == Sendcomment && styles_match_p)
+ break;
+
+ /* Assume a defun-start point is outside of strings. */
+ if (code == Sopen
+ && (from == stop || BUF_FETCH_CHAR (buf, from - 1) == '\n'))
+ break;
+ }
+
+ if (comstart_pos == 0)
+ from = comment_end;
+ /* If the earliest comment starter
+ is followed by uniform paired string quotes or none,
+ we know it can't be inside a string
+ since if it were then the comment ender would be inside one.
+ So it does start a comment. Skip back to it. */
+ else if (comstart_parity == 0 && !string_lossage)
+ from = comstart_pos;
+ else
+ {
+ /* We had two kinds of string delimiters mixed up
+ together. Decode this going forwards.
+ Scan fwd from the previous comment ender
+ to the one in question; this records where we
+ last passed a comment starter. */
+
+ struct lisp_parse_state state;
+ scan_sexps_forward (buf, &state, find_defun_start (buf, comment_end),
+ comment_end - 1, -10000, 0, Qnil, 0);
+ if (state.incomment)
+ from = state.comstr_start;
+ else
+ /* We can't grok this as a comment; scan it normally. */
+ from = comment_end;
+ UPDATE_SYNTAX_CACHE_FORWARD (from - 1);
+ }
+ return from;
+}
+
+static Bufpos
+find_end_of_comment (struct buffer *buf, Bufpos from, Bufpos stop, int comstyle)
+{
+ int c;
+ int syncode;
+ enum syntaxcode code, next_code;
+ /* mask to match comment styles against; for ST_COMMENT_STYLE, this
+ will get set to SYNTAX_COMMENT_STYLE_B, but never get checked */
+ int mask = comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A;
+
+ /* This is only called by functions which have already set up the
+ syntax_cache and are keeping it up-to-date */
+ while (1)
+ {
+ if (from == stop)
+ {
+ return -1;
+ }
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+
+ from++;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+
+ /* At end of current generic comment? */
+ if (comstyle == ST_COMMENT_STYLE)
+ {
+ if (code == Scomment_fence)
+ break; /* matched */
+ else
+ continue; /* Ignore other styles in generic comments */
+ }
+ /* At end of current one-character comment of specified style? */
+ else if (code == Sendcomment &&
+ SYNTAX_CODE_MATCHES_1CHAR_P (syncode, mask))
+ {
+ /* pre-MT code effectively does from-- here, that seems wrong */
+ break;
+ }
+
+ /* At end of current two-character comment of specified style? */
+ c = BUF_FETCH_CHAR (buf, from);
+ next_code = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ if (from < stop && SYNTAX_CODES_MATCH_END_P (syncode, next_code, mask))
+ {
+ from++;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ break;
+ }
+ }
+ return from;
+}
+
+\f
+/* #### between FSF 19.23 and 19.28 there are some changes to the logic
+ in this function (and minor changes to find_start_of_comment(),
+ above, which is part of Fforward_comment() in FSF). Attempts to port
+ that logic made this function break, so I'm leaving it out. If anyone
+ ever complains about this function not working properly, take a look
+ at those changes. --ben */
+
+DEFUN ("forward-comment", Fforward_comment, 0, 2, 0, /*
+Move forward across up to COUNT comments, or backwards if COUNT is negative.
+Stop scanning if we find something other than a comment or whitespace.
+Set point to where scanning stops.
+If COUNT comments are found as expected, with nothing except whitespace
+between them, return t; otherwise return nil.
+Point is set in either case.
+COUNT defaults to 1, and BUFFER defaults to the current buffer.
+*/
+ (count, buffer))
+{
+ Bufpos from;
+ Bufpos stop;
+ Emchar c;
+ enum syntaxcode code;
+ int syncode;
+ EMACS_INT n;
+ struct buffer *buf = decode_buffer (buffer, 0);
+
+ if (NILP (count))
+ n = 1;
+ else
+ {
+ CHECK_INT (count);
+ n = XINT (count);
+ }
+
+ from = BUF_PT (buf);
+
+ SCS_STATISTICS_SET_FUNCTION (scs_Fforward_comment);
+ SETUP_SYNTAX_CACHE (from, n);
+ while (n > 0)
+ {
+ QUIT;
+
+ stop = BUF_ZV (buf);
+ while (from < stop)
+ {
+ int comstyle = 0; /* Code for comment style: 0 for A, 1 for B,
+ or ST_COMMENT_STYLE */
+
+ if (char_quoted (buf, from))
+ {
+ from++;
+ continue;
+ }
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+
+ if (code == Scomment)
+ {
+ /* we have encountered a single character comment start
+ sequence, and we are ignoring all text inside comments.
+ we must record the comment style this character begins
+ so that later, only a comment end of the same style actually
+ ends the comment section */
+ comstyle =
+ SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ }
+
+ else if (code == Scomment_fence)
+ {
+ from++;
+ code = Scomment;
+ comstyle = ST_COMMENT_STYLE;
+ }
+
+ else if (from < stop && SYNTAX_CODE_START_FIRST_P (syncode))
+ {
+ int next_syncode;
+ UPDATE_SYNTAX_CACHE_FORWARD (from + 1);
+ next_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from + 1));
+
+ if (SYNTAX_CODES_START_P (syncode, next_syncode))
+ {
+ /* we have encountered a 2char comment start sequence and we
+ are ignoring all text inside comments. we must record
+ the comment style this sequence begins so that later,
+ only a comment end of the same style actually ends
+ the comment section */
+ code = Scomment;
+ comstyle =
+ SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ from++;
+ }
+ }
+
+ if (code == Scomment)
+ {
+ Bufpos newfrom = find_end_of_comment (buf, from, stop, comstyle);
+ if (newfrom < 0)
+ {
+ /* we stopped because from==stop */
+ BUF_SET_PT (buf, stop);
+ return Qnil;
+ }
+ from = newfrom;
+
+ /* We have skipped one comment. */
+ break;
+ }
+ else if (code != Swhitespace
+ && code != Sendcomment
+ && code != Scomment )
+ {
+ BUF_SET_PT (buf, from);
+ return Qnil;
+ }
+ from++;
+ }
+
+ /* End of comment reached */
+ n--;
+ }
+
+ while (n < 0)
+ {
+ QUIT;
+
+ stop = BUF_BEGV (buf);
+ while (from > stop)
+ {
+ int comstyle = 0; /* Code for comment style: 0 for A, 1 for B,
+ or ST_COMMENT_STYLE */
+
+ from--;
+ if (char_quoted (buf, from))
+ {
+ from--;
+ continue;
+ }
+
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+
+ if (code == Sendcomment)
+ {
+ /* we have found a single char end comment. we must record
+ the comment style encountered so that later, we can match
+ only the proper comment begin sequence of the same style */
+ comstyle =
+ SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ }
+
+ else if (code == Scomment_fence)
+ {
+ code = Sendcomment;
+ comstyle = ST_COMMENT_STYLE;
+ }
+
+ else if (from > stop
+ /* #### This seems logical but it's not in 21.4.9 */
+ /* && !char_quoted (buf, from - 1) */
+ && SYNTAX_CODE_END_SECOND_P (syncode))
+ {
+ int prev_syncode;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ prev_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from - 1));
+ if (SYNTAX_CODES_END_P (prev_syncode, syncode))
+ {
+ /* We must record the comment style encountered so that
+ later, we can match only the proper comment begin
+ sequence of the same style. */
+ code = Sendcomment;
+ comstyle =
+ SYNTAX_CODES_COMMENT_MASK_END (prev_syncode, syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ from--;
+ }
+ }
+
+ if (code == Sendcomment)
+ {
+ from = find_start_of_comment (buf, from, stop, comstyle);
+ break;
+ }
+
+ else if (code != Swhitespace
+ && code != Scomment
+ && code != Sendcomment)
+ {
+ BUF_SET_PT (buf, from + 1);
+ return Qnil;
+ }
+ }
+
+ n++;
+ }
+
+ BUF_SET_PT (buf, from);
+ return Qt;
+}
+
+\f
+Lisp_Object
+scan_lists (struct buffer *buf, Bufpos from, int count, int depth,
+ int sexpflag, int noerror)
+{
+ Bufpos stop;
+ Emchar c;
+ int quoted;
+ int mathexit = 0;
+ enum syntaxcode code;
+ int syncode;
+ int min_depth = depth; /* Err out if depth gets less than this. */
+
+ if (depth > 0) min_depth = 0;
+
+ SCS_STATISTICS_SET_FUNCTION (scs_scan_lists);
+ SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, from, count);
+ while (count > 0)
+ {
+ QUIT;
+
+ stop = BUF_ZV (buf);
+ while (from < stop)
+ {
+ int comstyle = 0; /* mask for finding matching comment style */
+ Emchar stringterm = '\0'; /* Used by Sstring case in switch */
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+ from++;
+
+ /* a 1-char comment start sequence */
+ if (code == Scomment && parse_sexp_ignore_comments)
+ {
+ comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode) ==
+ SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ }
+
+ /* else, a 2-char comment start sequence? */
+ else if (from < stop
+ && SYNTAX_CODE_START_FIRST_P (syncode)
+ && parse_sexp_ignore_comments)
+ {
+ int next_syncode;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ next_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from));
+
+ if (SYNTAX_CODES_START_P (syncode, next_syncode))
+ {
+ /* we have encountered a comment start sequence and we
+ are ignoring all text inside comments. we must record
+ the comment style this sequence begins so that later,
+ only a comment end of the same style actually ends
+ the comment section */
+ code = Scomment;
+ comstyle =
+ SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ from++;
+ }
+ }
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+
+ if (SYNTAX_CODE_PREFIX (syncode))
+ continue;
+
+ switch (code)
+ {
+ case Sescape:
+ case Scharquote:
+ if (from == stop) goto lose;
+ from++;
+ /* treat following character as a word constituent */
+ case Sword:
+ case Ssymbol:
+ if (depth || !sexpflag) break;
+ /* This word counts as a sexp; return at end of it. */
+ while (from < stop)
+ {
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ switch (SYNTAX_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from)))
+ {
+ case Scharquote:
+ case Sescape:
+ from++;
+ if (from == stop) goto lose;
+ break;
+ case Sword:
+ case Ssymbol:
+ case Squote:
+ break;
+ default:
+ goto done;
+ }
+ from++;
+ }
+ goto done;
+
+ case Scomment_fence:
+ comstyle = ST_COMMENT_STYLE;
+ /* falls through! */
+ case Scomment:
+ if (!parse_sexp_ignore_comments)
+ break;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ {
+ Bufpos newfrom =
+ find_end_of_comment (buf, from, stop, comstyle);
+ if (newfrom < 0)
+ {
+ /* we stopped because from == stop in search forward */
+ from = stop;
+ if (depth == 0)
+ goto done;
+ goto lose;
+ }
+ from = newfrom;
+ }
+ break;
+
+ case Smath:
+ if (!sexpflag)
+ break;
+ if (from != stop && c == BUF_FETCH_CHAR (buf, from))
+ from++;
+ if (mathexit)
+ {
+ mathexit = 0;
+ goto close1;
+ }
+ mathexit = 1;
+
+ case Sopen:
+ if (!++depth) goto done;
+ break;
+
+ case Sclose:
+ close1:
+ if (!--depth) goto done;
+ if (depth < min_depth)
+ {
+ if (noerror)
+ return Qnil;
+ error ("Containing expression ends prematurely");
+ }
+ break;
+
+ case Sstring:
+ {
+ /* XEmacs change: call syntax_match on character */
+ Emchar ch = BUF_FETCH_CHAR (buf, from - 1);
+ Lisp_Object stermobj =
+ syntax_match (syntax_cache.current_syntax_table, ch);
+
+ if (CHARP (stermobj))
+ stringterm = XCHAR (stermobj);
+ else
+ stringterm = ch;
+ }
+ /* falls through! */
+ case Sstring_fence:
+ while (1)
+ {
+ if (from >= stop)
+ goto lose;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ if (code == Sstring
+ ? c == stringterm
+ : SYNTAX_FROM_CACHE (mirrortab, c) == Sstring_fence)
+ break;
+
+ switch (SYNTAX_FROM_CACHE (mirrortab, c))
+ {
+ case Scharquote:
+ case Sescape:
+ from++;
+ break;
+ default:
+ break;
+ }
+ from++;
+ }
+ from++;
+ if (!depth && sexpflag) goto done;
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ /* Reached end of buffer. Error if within object,
+ return nil if between */
+ if (depth) goto lose;
+
+ return Qnil;
+
+ /* End of object reached */
+ done:
+ count--;
+ }
+
+ while (count < 0)
+ {
+ QUIT;
+
+ stop = BUF_BEGV (buf);
+ while (from > stop)
+ {
+ int comstyle = 0; /* mask for finding matching comment style */
+ Emchar stringterm = '\0'; /* used by case Sstring in switch below */
+
+ from--;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+ quoted = char_quoted (buf, from);
+ if (quoted)
+ {
+ from--;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+ }
+
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+
+ if (code == Sendcomment && parse_sexp_ignore_comments)
+ {
+ /* we have found a single char end comment. we must record
+ the comment style encountered so that later, we can match
+ only the proper comment begin sequence of the same style */
+ comstyle = SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ }
+
+ else if (from > stop
+ && SYNTAX_CODE_END_SECOND_P (syncode)
+ && !char_quoted (buf, from - 1)
+ && parse_sexp_ignore_comments)
+ {
+ int prev_syncode;
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ prev_syncode = SYNTAX_CODE_FROM_CACHE
+ (mirrortab, BUF_FETCH_CHAR (buf, from - 1));
+
+ if (SYNTAX_CODES_END_P (prev_syncode, syncode))
+ {
+ /* we must record the comment style encountered so that
+ later, we can match only the proper comment begin
+ sequence of the same style */
+ code = Sendcomment;
+ comstyle =
+ SYNTAX_CODES_COMMENT_MASK_END (prev_syncode, syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ from--;
+ }
+ }
+
+ if (SYNTAX_CODE_PREFIX (syncode))
+ continue;
+
+ switch (quoted ? Sword : code)
+ {
+ case Sword:
+ case Ssymbol:
+ if (depth || !sexpflag) break;
+ /* This word counts as a sexp; count object finished after
+ passing it. */
+ while (from > stop)
+ {
+ /* enum syntaxcode syncode; */
+ UPDATE_SYNTAX_CACHE_BACKWARD (from);
+ quoted = char_quoted (buf, from - 1);
+
+ if (quoted)
+ from--;
+ if (! (quoted
+ || (syncode =
+ SYNTAX_FROM_CACHE (mirrortab,
+ BUF_FETCH_CHAR (buf, from - 1)))
+ == Sword
+ || syncode == Ssymbol
+ || syncode == Squote))
+ goto done2;
+ from--;
+ }
+ goto done2;
+
+ case Smath:
+ if (!sexpflag)
+ break;
+ if (from != stop && c == BUF_FETCH_CHAR (buf, from - 1))
+ from--;
+ if (mathexit)
+ {
+ mathexit = 0;
+ goto open2;
+ }
+ mathexit = 1;
+
+ case Sclose:
+ if (!++depth) goto done2;
+ break;
+
+ case Sopen:
+ open2:
+ if (!--depth) goto done2;
+ if (depth < min_depth)
+ {
+ if (noerror)
+ return Qnil;
+ error ("Containing expression ends prematurely");
+ }
+ break;
+
+ case Scomment_fence:
+ comstyle = ST_COMMENT_STYLE;
+ /* falls through! */
+ case Sendcomment:
+ if (parse_sexp_ignore_comments)
+ from = find_start_of_comment (buf, from, stop, comstyle);
+ break;
+
+ case Sstring:
+ {
+ /* XEmacs change: call syntax_match() on character */
+ Emchar ch = BUF_FETCH_CHAR (buf, from);
+ Lisp_Object stermobj =
+ syntax_match (syntax_cache.current_syntax_table, ch);
+ if (CHARP (stermobj))
+ stringterm = XCHAR (stermobj);
+ else
+ stringterm = ch;
+ }
+
+ /* falls through! */
+ case Sstring_fence:
+ while (1)
+ {
+ if (from == stop) goto lose;
+
+ UPDATE_SYNTAX_CACHE_BACKWARD (from - 1);
+ c = BUF_FETCH_CHAR (buf, from - 1);
+ if ((code == Sstring
+ ? c == stringterm
+ : SYNTAX_FROM_CACHE (mirrortab, c) == Sstring_fence)
+ && !char_quoted (buf, from - 1))
+ {
+ break;
+ }
+
+ from--;
+ }
+ from--;
+ if (!depth && sexpflag) goto done2;
+ break;
+ }
+ }
+
+ /* Reached start of buffer. Error if within object,
+ return nil if between */
+ if (depth) goto lose;
+
+ return Qnil;
+
+ done2:
+ count++;
+ }
+
+
+ return (make_int (from));
+
+lose:
+ if (!noerror)
+ error ("Unbalanced parentheses");
+ return Qnil;
+}
+
+int
+char_quoted (struct buffer *buf, Bufpos pos)
+{
+ enum syntaxcode code;
+ Bufpos beg = BUF_BEGV (buf);
+ int quoted = 0;
+ Bufpos startpos = pos;
+
+ while (pos > beg)
+ {
+ UPDATE_SYNTAX_CACHE_BACKWARD (pos - 1);
+ code = SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, pos - 1));
+
+ if (code != Scharquote && code != Sescape)
+ break;
+ pos--;
+ quoted = !quoted;
+ }
+
+ UPDATE_SYNTAX_CACHE (startpos);
+ return quoted;
+}
+
+DEFUN ("scan-lists", Fscan_lists, 3, 5, 0, /*
+Scan from character number FROM by COUNT lists.
+Returns the character number of the position thus found.
+
+If DEPTH is nonzero, paren depth begins counting from that value,
+only places where the depth in parentheses becomes zero
+are candidates for stopping; COUNT such places are counted.
+Thus, a positive value for DEPTH means go out levels.
+
+Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
+
+If the beginning or end of (the accessible part of) the buffer is reached
+and the depth is wrong, an error is signaled.
+If the depth is right but the count is not used up, nil is returned.
+
+If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
+of in the current buffer.
+
+If optional arg NOERROR is non-nil, scan-lists will return nil instead of
+signalling an error.
+*/
+ (from, count, depth, buffer, noerror))
+{
+ struct buffer *buf;
+
+ CHECK_INT (from);
+ CHECK_INT (count);
+ CHECK_INT (depth);
+ buf = decode_buffer (buffer, 0);
+
+ return scan_lists (buf, XINT (from), XINT (count), XINT (depth), 0,
+ !NILP (noerror));
+}
+
+DEFUN ("scan-sexps", Fscan_sexps, 2, 4, 0, /*
+Scan from character number FROM by COUNT balanced expressions.
+If COUNT is negative, scan backwards.
+Returns the character number of the position thus found.
+
+Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
+
+If the beginning or end of (the accessible part of) the buffer is reached
+in the middle of a parenthetical grouping, an error is signaled.
+If the beginning or end is reached between groupings
+but before count is used up, nil is returned.
+
+If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
+of in the current buffer.
+
+If optional arg NOERROR is non-nil, scan-sexps will return nil instead of
+signalling an error.
+*/
+ (from, count, buffer, noerror))
+{
+ struct buffer *buf = decode_buffer (buffer, 0);
+ CHECK_INT (from);
+ CHECK_INT (count);
+
+ return scan_lists (buf, XINT (from), XINT (count), 0, 1, !NILP (noerror));
+}
+
+DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, 0, 1, 0, /*
+Move point backward over any number of chars with prefix syntax.
+This includes chars with "quote" or "prefix" syntax (' or p).
+
+Optional arg BUFFER defaults to the current buffer.
+*/
+ (buffer))
+{
+ struct buffer *buf = decode_buffer (buffer, 0);
+ Bufpos beg = BUF_BEGV (buf);
+ Bufpos pos = BUF_PT (buf);
+#ifndef emacs
+ Lisp_Char_Table *mirrortab = XCHAR_TABLE (buf->mirror_syntax_table);
+#endif
+ Emchar c = '\0'; /* initialize to avoid compiler warnings */
+
+
+ SCS_STATISTICS_SET_FUNCTION (scs_Fbackward_prefix_characters);
+ SETUP_SYNTAX_CACHE_FOR_BUFFER (buf, pos, -1);
+
+ while (pos > beg && !char_quoted (buf, pos - 1)
+ /* Previous statement updates syntax table. */
+ && (SYNTAX_FROM_CACHE (mirrortab, c = BUF_FETCH_CHAR (buf, pos - 1)) == Squote
+ /* equivalent to SYNTAX_PREFIX (mirrortab, c) */
+ || SYNTAX_CODE_PREFIX (SYNTAX_CODE_FROM_CACHE (mirrortab, c))))
+ pos--;
+
+ BUF_SET_PT (buf, pos);
+
+ return Qnil;
+}
+\f
+/* Parse forward from FROM to END,
+ assuming that FROM has state OLDSTATE (nil means FROM is start of function),
+ and return a description of the state of the parse at END.
+ If STOPBEFORE is nonzero, stop at the start of an atom.
+ If COMMENTSTOP is 1, stop at the start of a comment; if it is -1,
+ stop at the start of a comment or a string */
+
+static void
+scan_sexps_forward (struct buffer *buf, struct lisp_parse_state *stateptr,
+ Bufpos from, Bufpos end,
+ int targetdepth, int stopbefore,
+ Lisp_Object oldstate,
+ int commentstop)
+{
+ struct lisp_parse_state state;
+
+ enum syntaxcode code;
+ struct level { int last, prev; };
+ struct level levelstart[100];
+ struct level *curlevel = levelstart;
+ struct level *endlevel = levelstart + 100;
+ int depth; /* Paren depth of current scanning location.
+ level - levelstart equals this except
+ when the depth becomes negative. */
+ int mindepth; /* Lowest DEPTH value seen. */
+ int start_quoted = 0; /* Nonzero means starting after a char quote */
+ int boundary_stop = commentstop == -1;
+ Lisp_Object tem;
+
+ SCS_STATISTICS_SET_FUNCTION (scs_scan_sexps_forward);
+ SETUP_SYNTAX_CACHE (from, 1);
+ if (NILP (oldstate))
+ {
+ depth = 0;
+ state.instring = -1;
+ state.incomment = 0;
+ state.comstyle = 0; /* comment style a by default */
+ state.comstr_start = -1; /* no comment/string seen. */
+ }
+ else
+ {
+ tem = Fcar (oldstate); /* elt 0, depth */
+ if (!NILP (tem))
+ depth = XINT (tem);
+ else
+ depth = 0;
+
+ oldstate = Fcdr (oldstate);
+ oldstate = Fcdr (oldstate);
+ oldstate = Fcdr (oldstate);
+ tem = Fcar (oldstate); /* elt 3, instring */
+ state.instring = ( !NILP (tem)
+ ? ( INTP (tem) ? XINT (tem) : ST_STRING_STYLE)
+ : -1);
+
+ oldstate = Fcdr (oldstate);
+ tem = Fcar (oldstate); /* elt 4, incomment */
+ state.incomment = !NILP (tem);
+
+ oldstate = Fcdr (oldstate);
+ tem = Fcar (oldstate); /* elt 5, follows-quote */
+ start_quoted = !NILP (tem);
+
+ /* if the eighth element of the list is nil, we are in comment style
+ a; if it is t, we are in comment style b; if it is 'syntax-table,
+ we are in a generic comment */
+ oldstate = Fcdr (oldstate);
+ oldstate = Fcdr (oldstate);
+ /* The code below was changed radically for syntax-table properties.
+ A reasonable place to look if a bug manifests. */
+ tem = Fcar (oldstate); /* elt 7, comment style a/b/fence */
+ state.comstyle = NILP (tem) ? 0 : ( EQ (tem, Qsyntax_table)
+ ? ST_COMMENT_STYLE : 1 );
+
+ oldstate = Fcdr (oldstate); /* elt 8, start of last comment/string */
+ tem = Fcar (oldstate);
+ state.comstr_start = NILP (tem) ? -1 : XINT (tem);
+
+ /* elt 9, char numbers of starts-of-expression of levels
+ (starting from outermost). */
+ oldstate = Fcdr (oldstate);
+ tem = Fcar (oldstate); /* elt 9, intermediate data for
+ continuation of parsing (subject
+ to change). */
+ while (!NILP (tem)) /* >= second enclosing sexps. */
+ {
+ curlevel->last = XINT (Fcar (tem));
+ if (++curlevel == endlevel)
+ error ("Nesting too deep for parser");
+ curlevel->prev = -1;
+ curlevel->last = -1;
+ tem = Fcdr (tem);
+ }
+ /* end radical change section */
+ }
+ state.quoted = 0;
+ mindepth = depth;
+
+ curlevel->prev = -1;
+ curlevel->last = -1;
+
+ /* Enter the loop at a place appropriate for initial state. */
+
+ if (state.incomment) goto startincomment;
+ if (state.instring >= 0)
+ {
+ if (start_quoted) goto startquotedinstring;
+ goto startinstring;
+ }
+ if (start_quoted) goto startquoted;
+
+ while (from < end)
+ {
+ Emchar c;
+ int syncode;
+
+ QUIT;
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
+ code = SYNTAX_FROM_CODE (syncode);
+ from++;
+
+ /* record the comment style we have entered so that only the
+ comment-ender sequence (or single char) of the same style
+ actually terminates the comment section. */
+ if (code == Scomment)
+ {
+ state.comstyle =
+ SYNTAX_CODE_COMMENT_1CHAR_MASK (syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ state.comstr_start = from - 1;
+ }
+
+ /* a generic comment delimiter? */
+ else if (code == Scomment_fence)
+ {
+ state.comstyle = ST_COMMENT_STYLE;
+ state.comstr_start = from - 1;
+ code = Scomment;
+ }
+
+ else if (from < end &&
+ SYNTAX_CODE_START_FIRST_P (syncode))
+ {
+ int next_syncode;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ next_syncode =
+ SYNTAX_CODE_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from));
+
+ if (SYNTAX_CODES_START_P (syncode, next_syncode))
+ {
+ code = Scomment;
+ state.comstyle =
+ SYNTAX_CODES_COMMENT_MASK_START (syncode, next_syncode)
+ == SYNTAX_COMMENT_STYLE_A ? 0 : 1;
+ state.comstr_start = from - 1;
+ from++;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ }
+ }
+
+ if (SYNTAX_CODE_PREFIX (syncode))
+ continue;
+ switch (code)
+ {
+ case Sescape:
+ case Scharquote:
+ if (stopbefore) goto stop; /* this arg means stop at sexp start */
+ curlevel->last = from - 1;
+ startquoted:
+ if (from == end) goto endquoted;
+ from++;
+ goto symstarted;
+ /* treat following character as a word constituent */
+ case Sword:
+ case Ssymbol:
+ if (stopbefore) goto stop; /* this arg means stop at sexp start */
+ curlevel->last = from - 1;
+ symstarted:
+ while (from < end)
+ {
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ switch (SYNTAX_FROM_CACHE (mirrortab, BUF_FETCH_CHAR (buf, from)))
+ {
+ case Scharquote:
+ case Sescape:
+ from++;
+ if (from == end) goto endquoted;
+ break;
+ case Sword:
+ case Ssymbol:
+ case Squote:
+ break;
+ default:
+ goto symdone;
+ }
+ from++;
+ }
+ symdone:
+ curlevel->prev = curlevel->last;
+ break;
+
+ case Scomment:
+ state.incomment = 1;
+ if (commentstop || boundary_stop) goto done;
+ startincomment:
+ if (commentstop == 1)
+ goto done;
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ {
+ Bufpos newfrom = find_end_of_comment (buf, from, end, state.comstyle);
+ if (newfrom < 0)
+ {
+ /* we terminated search because from == end */
+ from = end;
+ goto done;
+ }
+ from = newfrom;
+ }
+ state.incomment = 0;
+ state.comstyle = 0; /* reset the comment style */
+ if (boundary_stop) goto done;
+ break;
+
+ case Sopen:
+ if (stopbefore) goto stop; /* this arg means stop at sexp start */
+ depth++;
+ /* curlevel++->last ran into compiler bug on Apollo */
+ curlevel->last = from - 1;
+ if (++curlevel == endlevel)
+ error ("Nesting too deep for parser");
+ curlevel->prev = -1;
+ curlevel->last = -1;
+ if (targetdepth == depth) goto done;
+ break;
+
+ case Sclose:
+ depth--;
+ if (depth < mindepth)
+ mindepth = depth;
+ if (curlevel != levelstart)
+ curlevel--;
+ curlevel->prev = curlevel->last;
+ if (targetdepth == depth) goto done;
+ break;
+
+ case Sstring:
+ case Sstring_fence:
+ state.comstr_start = from - 1;
+ if (stopbefore) goto stop; /* this arg means stop at sexp start */
+ curlevel->last = from - 1;
+ if (code == Sstring_fence)
+ {
+ state.instring = ST_STRING_STYLE;
+ }
+ else
+ {
+ /* XEmacs change: call syntax_match() on character */
+ Emchar ch = BUF_FETCH_CHAR (buf, from - 1);
+ Lisp_Object stermobj =
+ syntax_match (syntax_cache.current_syntax_table, ch);
+
+ if (CHARP (stermobj))
+ state.instring = XCHAR (stermobj);
+ else
+ state.instring = ch;
+ }
+ if (boundary_stop) goto done;
+ startinstring:
+ while (1)
+ {
+ enum syntaxcode temp_code;
+
+ if (from >= end) goto done;
+
+ UPDATE_SYNTAX_CACHE_FORWARD (from);
+ c = BUF_FETCH_CHAR (buf, from);
+ temp_code = SYNTAX_FROM_CACHE (mirrortab, c);
+
+ if (
+ state.instring != ST_STRING_STYLE &&
+ temp_code == Sstring &&
+ c == state.instring) break;
+
+ switch (temp_code)
+ {
+ case Sstring_fence:
+ if (state.instring == ST_STRING_STYLE)
+ goto string_end;
+ break;
+ case Scharquote:
+ case Sescape:
+ {
+ from++;
+ startquotedinstring:
+ if (from >= end) goto endquoted;
+ break;
+ }
+ default:
+ break;
+ }
+ from++;
+ }
+ string_end:
+ state.instring = -1;
+ curlevel->prev = curlevel->last;
+ from++;
+ if (boundary_stop) goto done;
+ break;
+
+ case Smath:
+ break;
+
+ case Swhitespace:
+ case Spunct:
+ case Squote:
+ case Sendcomment:
+ case Scomment_fence:
+ case Sinherit:
+ case Smax:
+ break;
+ }
+ }
+ goto done;
+
+ stop: /* Here if stopping before start of sexp. */
+ from--; /* We have just fetched the char that starts it; */
+ goto done; /* but return the position before it. */
+
+ endquoted:
+ state.quoted = 1;
+ done:
+ state.depth = depth;
+ state.mindepth = mindepth;
+ state.thislevelstart = curlevel->prev;
+ state.prevlevelstart
+ = (curlevel == levelstart) ? -1 : (curlevel - 1)->last;
+ state.location = from;
+ state.levelstarts = Qnil;
+ while (--curlevel >= levelstart)
+ state.levelstarts = Fcons (make_int (curlevel->last),
+ state.levelstarts);
+
+ *stateptr = state;
+}
+
+DEFUN ("parse-partial-sexp", Fparse_partial_sexp, 2, 7, 0, /*
+Parse Lisp syntax starting at FROM until TO; return status of parse at TO.
+Parsing stops at TO or when certain criteria are met;
+ point is set to where parsing stops.
+If fifth arg OLDSTATE is omitted or nil,
+ parsing assumes that FROM is the beginning of a function.
+Value is a list of nine elements describing final state of parsing:
+ 0. depth in parens.
+ 1. character address of start of innermost containing list; nil if none.
+ 2. character address of start of last complete sexp terminated.
+ 3. non-nil if inside a string.
+ (It is the character that will terminate the string,
+ or t if the string should be terminated by an explicit
+ `syntax-table' property.)
+ 4. t if inside a comment.
+ 5. t if following a quote character.
+ 6. the minimum paren-depth encountered during this scan.
+ 7. nil if in comment style a, or not in a comment; t if in comment style b;
+ `syntax-table' if given by an explicit `syntax-table' property.
+ 8. character address of start of last comment or string; nil if none.
+ 9. Intermediate data for continuation of parsing (subject to change).
+If third arg TARGETDEPTH is non-nil, parsing stops if the depth
+in parentheses becomes equal to TARGETDEPTH.
+Fourth arg STOPBEFORE non-nil means stop when come to
+ any character that starts a sexp.
+Fifth arg OLDSTATE is a nine-element list like what this function returns.
+It is used to initialize the state of the parse. Its second and third
+elements are ignored.
+Sixth arg COMMENTSTOP non-nil means stop at the start of a comment. If it
+is `syntax-table', stop after the start of a comment or a string, or after
+the end of a comment or string.
+*/
+ (from, to, targetdepth, stopbefore, oldstate, commentstop, buffer))
+{
+ struct lisp_parse_state state;
+ int target;
+ Bufpos start, end;
+ struct buffer *buf = decode_buffer (buffer, 0);
+ Lisp_Object val;
+
+ if (!NILP (targetdepth))
+ {
+ CHECK_INT (targetdepth);
+ target = XINT (targetdepth);
+ }
+ else
+ target = -100000; /* We won't reach this depth */
+
+ get_buffer_range_char (buf, from, to, &start, &end, 0);
+ scan_sexps_forward (buf, &state, start, end,
+ target, !NILP (stopbefore), oldstate,
+ (NILP (commentstop)
+ ? 0 : (EQ (commentstop, Qsyntax_table) ? -1 : 1)));
+ BUF_SET_PT (buf, state.location);
+
+ /* reverse order */
+ val = Qnil;
+ val = Fcons (state.levelstarts, val);
+ val = Fcons ((state.incomment || (state.instring >= 0))
+ ? make_int (state.comstr_start) : Qnil, val);
+ val = Fcons (state.comstyle ? (state.comstyle == ST_COMMENT_STYLE
+ ? Qsyntax_table : Qt) : Qnil, val);
+ val = Fcons (make_int (state.mindepth), val);
+ val = Fcons (state.quoted ? Qt : Qnil, val);
+ val = Fcons (state.incomment ? Qt : Qnil, val);
+ val = Fcons (state.instring < 0
+ ? Qnil
+ : (state.instring == ST_STRING_STYLE
+ ? Qt : make_int (state.instring)), val);
+ val = Fcons (state.thislevelstart < 0 ? Qnil : make_int (state.thislevelstart), val);
+ val = Fcons (state.prevlevelstart < 0 ? Qnil : make_int (state.prevlevelstart), val);
+ val = Fcons (make_int (state.depth), val);
+
+ return val;
+}
+
+
+/* Updating of the mirror syntax table.
+
+ Each syntax table has a corresponding mirror table in it.
+ Whenever we make a change to a syntax table, we call
+ update_syntax_table() on it.
+
+ #### We really only need to map over the changed range.
+
+ If we change the standard syntax table, we need to map over
+ all tables because any of them could be inheriting from the
+ standard syntax table.
+
+ When `set-syntax-table' is called, we set the buffer's mirror
+ syntax table as well.
+ */
+
+struct cmst_arg
+{
+ Lisp_Object mirrortab;
+ int check_inherit;
+};
+
+static int
+cmst_mapfun (struct chartab_range *range, Lisp_Object val, void *arg)
+{
+ struct cmst_arg *closure = (struct cmst_arg *) arg;
+
+ if (CONSP (val))
+ val = XCAR (val);
+ if (SYNTAX_FROM_CODE (XINT (val)) == Sinherit
+ && closure->check_inherit)
+ {
+ struct cmst_arg recursive;
+
+ recursive.mirrortab = closure->mirrortab;
+ recursive.check_inherit = 0;
+ map_char_table (XCHAR_TABLE (Vstandard_syntax_table), range,
+ cmst_mapfun, &recursive);
+ }
+ else
+ put_char_table (XCHAR_TABLE (closure->mirrortab), range, val);
+ return 0;
+}
+
+static void
+update_just_this_syntax_table (Lisp_Char_Table *ct)
+{
+ struct chartab_range range;
+ struct cmst_arg arg;
+
+ arg.mirrortab = ct->mirror_table;
+ arg.check_inherit = (CHAR_TABLEP (Vstandard_syntax_table)
+ && ct != XCHAR_TABLE (Vstandard_syntax_table));
+ range.type = CHARTAB_RANGE_ALL;
+ map_char_table (ct, &range, cmst_mapfun, &arg);
+}
+
+/* Called from chartab.c when a change is made to a syntax table.
+ If this is the standard syntax table, we need to recompute
+ *all* syntax tables (yuck). Otherwise we just recompute this
+ one. */
+
+void
+update_syntax_table (Lisp_Char_Table *ct)
+{
+ /* Don't be stymied at startup. */
+ if (CHAR_TABLEP (Vstandard_syntax_table)
+ && ct == XCHAR_TABLE (Vstandard_syntax_table))
+ {
+ Lisp_Object syntab;
+
+ for (syntab = Vall_syntax_tables; !NILP (syntab);
+ syntab = XCHAR_TABLE (syntab)->next_table)
+ update_just_this_syntax_table (XCHAR_TABLE (syntab));
+ }
+ else
+ update_just_this_syntax_table (ct);
+}
+
+\f
+/************************************************************************/
+/* initialization */
+/************************************************************************/
+
+void
+syms_of_syntax (void)
+{
+ defsymbol (&Qsyntax_table_p, "syntax-table-p");
+ defsymbol (&Qsyntax_table, "syntax-table");
+
+ DEFSUBR (Fsyntax_table_p);
+ DEFSUBR (Fsyntax_table);
+ DEFSUBR (Fstandard_syntax_table);
+ DEFSUBR (Fcopy_syntax_table);
+ DEFSUBR (Fset_syntax_table);
+ DEFSUBR (Fsyntax_designator_chars);
+ DEFSUBR (Fchar_syntax);
+ DEFSUBR (Fmatching_paren);
+ /* DEFSUBR (Fmodify_syntax_entry); now in Lisp. */
+ /* DEFSUBR (Fdescribe_syntax); now in Lisp. */
+
+ DEFSUBR (Fforward_word);
+
+ DEFSUBR (Fforward_comment);
+ DEFSUBR (Fscan_lists);
+ DEFSUBR (Fscan_sexps);
+ DEFSUBR (Fbackward_prefix_chars);
+ DEFSUBR (Fparse_partial_sexp);
+}
+
+void
+vars_of_syntax (void)
+{
+ DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments /*
+Non-nil means `forward-sexp', etc., should treat comments as whitespace.
+*/ );
+ parse_sexp_ignore_comments = 0;
+
+ DEFVAR_BOOL ("lookup-syntax-properties", &lookup_syntax_properties /*
+Non-nil means `forward-sexp', etc., look up character syntax in the
+table that is the value of the `syntax-table' text property, if non-nil.
+The value of this property should be either a syntax table, or a cons
+of the form (SYNTAXCODE . MATCHCHAR), SYNTAXCODE being the numeric
+syntax code, MATCHCHAR being nil or the character to match (which is
+relevant only for open/close type.
+*/ );
+ lookup_syntax_properties = 0; /* #### default off until optimized */
+
+ DEFVAR_BOOL ("words-include-escapes", &words_include_escapes /*
+Non-nil means `forward-word', etc., should treat escape chars part of words.
+*/ );
+ words_include_escapes = 0;
+
+ no_quit_in_re_search = 0;
+}
+
+static void
+define_standard_syntax (const char *p, enum syntaxcode syn)
+{
+ for (; *p; p++)
+ Fput_char_table (make_char (*p), make_int (syn), Vstandard_syntax_table);
+}
+
+void
+complex_vars_of_syntax (void)
+{
+ Emchar i;
+ const char *p;
+ /* Set this now, so first buffer creation can refer to it. */
+ /* Make it nil before calling copy-syntax-table
+ so that copy-syntax-table will know not to try to copy from garbage */
+ Vstandard_syntax_table = Qnil;
+ Vstandard_syntax_table = Fcopy_syntax_table (Qnil);
+ staticpro (&Vstandard_syntax_table);
+
+ Vsyntax_designator_chars_string = make_string_nocopy (syntax_code_spec,
+ Smax);
+ staticpro (&Vsyntax_designator_chars_string);
+
+ fill_char_table (XCHAR_TABLE (Vstandard_syntax_table), make_int (Spunct));
+
+ for (i = 0; i <= 32; i++) /* Control 0 plus SPACE */
+ Fput_char_table (make_char (i), make_int (Swhitespace),
+ Vstandard_syntax_table);
+ for (i = 127; i <= 159; i++) /* DEL plus Control 1 */
+ Fput_char_table (make_char (i), make_int (Swhitespace),
+ Vstandard_syntax_table);
+
+ define_standard_syntax ("abcdefghijklmnopqrstuvwxyz"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+ "0123456789"
+ "$%", Sword);
+ define_standard_syntax ("\"", Sstring);
+ define_standard_syntax ("\\", Sescape);
+ define_standard_syntax ("_-+*/&|<>=", Ssymbol);
+ define_standard_syntax (".,;:?!#@~^'`", Spunct);
+
+ for (p = "()[]{}"; *p; p+=2)
+ {
+ Fput_char_table (make_char (p[0]),
+ Fcons (make_int (Sopen), make_char (p[1])),
+ Vstandard_syntax_table);
+ Fput_char_table (make_char (p[1]),
+ Fcons (make_int (Sclose), make_char (p[0])),
+ Vstandard_syntax_table);
+ }
+}
projects / chise / xemacs-chise.git- / blobdiff