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- /* GNU Emacs routines to deal with syntax tables; also word and list parsing.
- Copyright (C) 1985-1993 Free Software Foundation, Inc.
-
- This file is part of GNU Emacs.
-
- GNU Emacs 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.
-
- GNU Emacs 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 GNU Emacs; see the file COPYING. If not, write to
- the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
-
-
- #include "config.h"
- #include <ctype.h>
- #include "lisp.h"
- #include "commands.h"
- #include "buffer.h"
- #include "syntax.h"
-
- Lisp_Object Qsyntax_table_p;
-
- int words_include_escapes;
-
- extern int zmacs_region_stays;
-
- /* There is an alist of syntax tables: names (strings) vs obarrays. */
-
- DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0,
- "Return t if ARG is a syntax table.\n\
- Any vector of 256 elements will do.")
- (obj)
- Lisp_Object obj;
- {
- if (VECTORP (obj) && XVECTOR (obj)->size == 0400)
- return Qt;
- return Qnil;
- }
-
- static Lisp_Object
- check_syntax_table (obj)
- Lisp_Object obj;
- {
- register Lisp_Object tem;
- while (tem = Fsyntax_table_p (obj),
- NILP (tem))
- obj = wrong_type_argument (Qsyntax_table_p, obj);
- return obj;
- }
-
-
- DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 0, 0,
- "Return the current syntax table.\n\
- This is the one specified by the current buffer.")
- ()
- {
- return current_buffer->syntax_table;
- }
-
- DEFUN ("standard-syntax-table", Fstandard_syntax_table,
- Sstandard_syntax_table, 0, 0, 0,
- "Return the standard syntax table.\n\
- This is the one used for new buffers.")
- ()
- {
- return Vstandard_syntax_table;
- }
-
- DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0,
- "Construct a new syntax table and return it.\n\
- It is a copy of the TABLE, which defaults to the standard syntax table.")
- (table)
- Lisp_Object table;
- {
- Lisp_Object size, val;
- XFASTINT (size) = 0400;
- XFASTINT (val) = 0;
- val = Fmake_vector (size, val);
- if (!NILP (table))
- table = check_syntax_table (table);
- else if (NILP (Vstandard_syntax_table))
- /* Can only be null during initialization */
- return val;
- else table = Vstandard_syntax_table;
-
- memcpy (XVECTOR (val)->contents, XVECTOR (table)->contents,
- 0400 * sizeof (Lisp_Object));
- return val;
- }
-
- DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 1, 0,
- "Select a new syntax table for the current buffer.\n\
- One argument, a syntax table.")
- (table)
- Lisp_Object table;
- {
- table = check_syntax_table (table);
- current_buffer->syntax_table = table;
- /* Indicate that this buffer now has a specified syntax table. */
- current_buffer->local_var_flags |= buffer_local_flags.syntax_table;
- return table;
- }
-
- /* Convert a letter which signifies a syntax code
- into the code it signifies.
- This is used by modify-syntax-entry, and other things. */
-
- 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,
- 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) 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, 0377, 0377, 0377, 0377
- };
-
- /* Indexed by syntax code, give the letter that describes it. */
-
- unsigned char syntax_code_spec[13] =
- {
- ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>'
- };
-
- DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 1, 0,
- "Return the syntax code of CHAR, described by a character.\n\
- For example, if CHAR is a word constituent, the character `?w' is returned.\n\
- The characters that correspond to various syntax codes\n\
- are listed in the documentation of `modify-syntax-entry'.")
- (ch)
- Lisp_Object ch;
- {
- CHECK_FIXNUM (ch, 0);
- return make_number (syntax_code_spec[(int) SYNTAX (0xFF & XINT (ch))]);
- }
-
- #ifdef NEW_SYNTAX
-
- /* This comment supplies the doc string for modify-syntax-entry,
- for make-docfile to see. We cannot put this in the real DEFUN
- due to limits in the Unix cpp.
-
- DEFUN ("modify-syntax-entry", foo, bar, 0, 0, 0,
- "Set syntax for character CHAR according to string S.\n\
- The syntax is changed only for table TABLE, which defaults to\n\
- the current buffer's syntax table.\n\
- The first character of S should be one of the following:\n\
- Space whitespace syntax. w word constituent.\n\
- _ symbol constituent. . punctuation.\n\
- ( open-parenthesis. ) close-parenthesis.\n\
- \" string quote. \\ character-quote.\n\
- $ paired delimiter. ' expression quote or prefix operator.\n\
- < comment starter. > comment ender.\n\
- Only single-character comment start and end sequences are represented thus.\n\
- Two-character sequences are represented as described below.\n\
- The second character of S is the matching parenthesis,\n\
- used only if the first character is `(' or `)'.\n\
- Any additional characters are flags.\n\
- Defined flags are the characters 1, 2, 3, 4, 5, 6, 7, 8, p, a, and b.\n\
- 1 means C is the first of a two-char comment start sequence of style a.\n\
- 2 means C is the second character of such a sequence.\n\
- 3 means C is the first of a two-char comment end sequence of style a.\n\
- 4 means C is the second character of such a sequence.\n\
- 5 means C is the first of a two-char comment start sequence of style b.\n\
- 6 means C is the second character of such a sequence.\n\
- 7 means C is the first of a two-char comment end sequence of style b.\n\
- 8 means C is the second character of such a sequence.\n\
- p means C is a prefix character for `backward-prefix-chars';\n\
- such characters are treated as whitespace when they occur\n\
- between expressions.\n\
- a means C is comment starter or comment ender for comment style a (default)\n\
- b means C is comment starter or comment ender for comment style b.")
- (c, newentry, syntax_table)
- */
-
- #else /* !NEW_SYNTAX */
-
- /* This comment supplies the doc string for modify-syntax-entry,
- for make-docfile to see. We cannot put this in the real DEFUN
- due to limits in the Unix cpp.
-
- ****DEFUN ("modify-syntax-entry", foo, bar, 0, 0, 0,
- "Set syntax for character CHAR according to string S.\n\
- The syntax is changed only for table TABLE, which defaults to\n\
- the current buffer's syntax table.\n\
- The first character of S should be one of the following:\n\
- Space whitespace syntax. w word constituent.\n\
- _ symbol constituent. . punctuation.\n\
- ( open-parenthesis. ) close-parenthesis.\n\
- \" string quote. \\ character-quote.\n\
- $ paired delimiter. ' expression quote or prefix operator.\n\
- < comment starter. > comment ender.\n\
- Only single-character comment start and end sequences are represented thus.\n\
- Two-character sequences are represented as described below.\n\
- The second character of S is the matching parenthesis,\n\
- used only if the first character is `(' or `)'.\n\
- Any additional characters are flags.\n\
- Defined flags are the characters 1, 2, 3, 4, and p.\n\
- 1 means C is the start of a two-char comment start sequence.\n\
- 2 means C is the second character of such a sequence.\n\
- 3 means C is the start of a two-char comment end sequence.\n\
- 4 means C is the second character of such a sequence.\n\
- p means C is a prefix character for `backward-prefix-chars';
- such characters are treated as whitespace when they occur
- between expressions.")
- (c, newentry, syntax_table)
- */
- #endif /* NEW_SYNTAX */
-
- DEFUN ("modify-syntax-entry", Fmodify_syntax_entry, Smodify_syntax_entry, 2, 3,
- /* I really don't know why this is interactive
- help-form should at least be made useful whilst reading the second arg
- */
- "cSet syntax for character: \nsSet syntax for %s to: ",
- 0 /* See immediately above */)
- (c, newentry, syntax_table)
- Lisp_Object c, newentry, syntax_table;
- {
- register unsigned char *p, match;
- register enum syntaxcode code;
- Lisp_Object val;
-
- #ifdef NEW_SYNTAX
- int b_flag_seen_p = 0;
- #endif /* NEW_SYNTAX */
-
- CHECK_FIXNUM (c, 0);
- CHECK_STRING (newentry, 1);
- if (NILP (syntax_table))
- syntax_table = current_buffer->syntax_table;
- else
- syntax_table = check_syntax_table (syntax_table);
-
- p = XSTRING (newentry)->data;
- code = (enum syntaxcode) syntax_spec_code[*p++];
- if (((int) code & 0377) == 0377)
- error ("invalid syntax description letter: %c", c);
-
- match = *p;
- if (match) p++;
- if (match == ' ') match = 0;
-
- XFASTINT (val) = (match << 8) + (int) code;
-
- while (*p)
- switch (*p++)
- {
-
- #ifdef NEW_SYNTAX
-
- case '1':
- XFASTINT (val) |= SYNTAX_FIRST_OF_START_A << 16;
- break;
-
- case '2':
- XFASTINT (val) |= SYNTAX_SECOND_OF_START_A << 16;
- break;
-
- case '3':
- XFASTINT (val) |= SYNTAX_FIRST_OF_END_A << 16;
- break;
-
- case '4':
- XFASTINT (val) |= SYNTAX_SECOND_OF_END_A << 16;
- break;
-
- case '5':
- XFASTINT (val) |= SYNTAX_FIRST_OF_START_B << 16;
- break;
-
- case '6':
- XFASTINT (val) |= SYNTAX_SECOND_OF_START_B << 16;
- break;
-
- case '7':
- XFASTINT (val) |= SYNTAX_FIRST_OF_END_B << 16;
- break;
-
- case '8':
- XFASTINT (val) |= SYNTAX_SECOND_OF_END_B << 16;
- break;
-
- case 'a':
- if (code == Scomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_START_A << 16;
- else if (code == Sendcomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_END_A << 16;
-
- break;
-
- case 'b':
- if (code == Scomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_START_B << 16;
- else if (code == Sendcomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_END_B << 16;
-
- b_flag_seen_p = 1;
- break;
-
- case 'p':
- XFASTINT (val) |= 1 << 24;
- break;
-
- #else /* !NEW_SYNTAX */
-
- case '1':
- XFASTINT (val) |= 1 << 16;
- break;
-
- case '2':
- XFASTINT (val) |= 1 << 17;
- break;
-
- case '3':
- XFASTINT (val) |= 1 << 18;
- break;
-
- case '4':
- XFASTINT (val) |= 1 << 19;
- break;
-
- case 'p':
- XFASTINT (val) |= 1 << 20;
- break;
-
- #endif /* NEW_SYNTAX */
-
- }
-
- #ifdef NEW_SYNTAX
-
- /* default single char style is a if b has not been seen */
- if (!b_flag_seen_p)
- if (code == Scomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_START_A << 16;
- else if (code == Sendcomment)
- XFASTINT (val) |= SYNTAX_FIRST_OF_END_A << 16;
-
- #endif /* NEW_SYNTAX */
-
- XVECTOR (syntax_table)->contents[0xFF & XINT (c)] = val;
-
- return Qnil;
- }
-
- /* Dump syntax table to buffer in human-readable format */
-
- static void
- describe_syntax (value)
- Lisp_Object value;
- {
- register enum syntaxcode code;
- char desc, match, start1, start2, end1, end2, prefix;
- char str[2];
- #ifdef NEW_SYNTAX
- char start1b, start2b, end1b, end2b;
- #endif /* NEW_SYNTAX */
-
- Findent_to (make_number (16), make_number (1));
-
- if (!FIXNUMP (value))
- {
- insert_string ("invalid");
- return;
- }
-
- code = (enum syntaxcode) (XINT (value) & 0377);
- match = (XINT (value) >> 8) & 0377;
-
- #ifdef NEW_SYNTAX
-
- start1 = (XINT (value) >> 16) & SYNTAX_FIRST_OF_START_A;
- start2 = (XINT (value) >> 16) & SYNTAX_SECOND_OF_START_A;
- end1 = (XINT (value) >> 16) & SYNTAX_FIRST_OF_END_A;
- end2 = (XINT (value) >> 16) & SYNTAX_SECOND_OF_END_A;
- start1b = (XINT (value) >> 16) & SYNTAX_FIRST_OF_START_B;
- start2b = (XINT (value) >> 16) & SYNTAX_SECOND_OF_START_B;
- end1b = (XINT (value) >> 16) & SYNTAX_FIRST_OF_END_B;
- end2b = (XINT (value) >> 16) & SYNTAX_SECOND_OF_END_B;
-
- prefix = (XINT (value) >> 24) & 1;
-
- #else /* !NEW_SYNTAX */
-
- start1 = (XINT (value) >> 16) & 1;
- start2 = (XINT (value) >> 17) & 1;
- end1 = (XINT (value) >> 18) & 1;
- end2 = (XINT (value) >> 19) & 1;
- prefix = (XINT (value) >> 20) & 1;
-
- #endif /* NEW_SYNTAX */
-
- if ((int) code < 0 || (int) code >= (int) Smax)
- {
- insert_string ("invalid");
- return;
- }
- desc = syntax_code_spec[(int) code];
-
- str[0] = desc, str[1] = 0;
- insert_raw_string (str, 1);
-
- str[0] = match ? match : ' ';
- insert_raw_string (str, 1);
-
- #ifdef NEW_SYNTAX
-
- if (start1)
- if (code==Scomment)
- insert_raw_string ("a", 1);
- else
- insert_raw_string ("1", 1);
-
- if (start2)
- insert_raw_string ("2", 1);
-
- if (end1)
- if (code==Sendcomment)
- insert_raw_string ("a", 1);
- else
- insert_raw_string ("3", 1);
-
- if (end2)
- insert_raw_string ("4", 1);
-
- if (start1b)
- if (code==Scomment)
- insert_raw_string ("b", 1);
- else
- insert_raw_string ("5", 1);
-
- if (start2b)
- insert_raw_string ("6", 1);
-
- if (end1b)
- if (code==Sendcomment)
- insert_raw_string ("b", 1);
- else
- insert_raw_string ("7", 1);
-
- if (end2b)
- insert_raw_string ("8", 1);
-
- #else /* !NEW_SYNTAX */
-
- if (start1)
- insert_raw_string ("1", 1);
- if (start2)
- insert_raw_string ("2", 1);
-
- if (end1)
- insert_raw_string ("3", 1);
- if (end2)
- insert_raw_string ("4", 1);
-
- #endif /* NEW_SYNTAX */
-
- if (prefix)
- insert_raw_string ("p", 1);
-
- insert_string ("\twhich means: ");
-
- #ifdef SWITCH_ENUM_BUG
- switch ((int) code)
- #else
- switch (code)
- #endif
- {
- case Swhitespace:
- insert_string ("whitespace"); break;
- case Spunct:
- insert_string ("punctuation"); break;
- case Sword:
- insert_string ("word"); break;
- case Ssymbol:
- insert_string ("symbol"); break;
- case Sopen:
- insert_string ("open"); break;
- case Sclose:
- insert_string ("close"); break;
- case Squote:
- insert_string ("quote"); break;
- case Sstring:
- insert_string ("string"); break;
- case Smath:
- insert_string ("math"); break;
- case Sescape:
- insert_string ("escape"); break;
- case Scharquote:
- insert_string ("charquote"); break;
- case Scomment:
- insert_string ("comment"); break;
- case Sendcomment:
- insert_string ("endcomment"); break;
- default:
- insert_string ("invalid");
- return;
- }
-
- if (match)
- {
- insert_string (", matches ");
-
- str[0] = match, str[1] = 0;
- insert_raw_string (str, 1);
- }
-
- #ifdef NEW_SYNTAX
-
- if (start1)
- if (code==Scomment)
- insert_string (",\n\t starts comment style a");
- else
- insert_string (",\n\t is the first char of a style a, comment-start sequence");
-
- if (start2)
- insert_string (",\n\t is the second char of a style a, comment-start sequence");
-
- if (end1)
- if (code==Sendcomment)
- insert_string (",\n\t ends comment style a");
- else
- insert_string (",\n\t is the first char of a style a, comment-end sequence");
-
- if (end2)
- insert_string (",\n\t is the second char of a style a, comment-end sequence");
-
- if (start1b)
- if (code==Scomment)
- insert_string (",\n\t starts comment style b");
- else
- insert_string (",\n\t is the first char of a style b, comment-start sequence");
-
- if (start2b)
- insert_string (",\n\t is the second char of a style b, comment-start sequence");
-
- if (end1b)
- if (code==Sendcomment)
- insert_string (",\n\t ends comment style b");
- else
- insert_string (",\n\t is the first char of a style b, comment-end sequence");
-
- if (end2b)
- insert_string (",\n\t is the second char of a style b, comment-end sequence");
-
- #else /* !NEW_SYNTAX */
-
- if (start1)
- insert_string (",\n\t is the first character of a comment-start sequence");
- if (start2)
- insert_string (",\n\t is the second character of a comment-start sequence");
-
- if (end1)
- insert_string (",\n\t is the first character of a comment-end sequence");
- if (end2)
- insert_string (",\n\t is the second character of a comment-end sequence");
-
- #endif /* NEW_SYNTAX */
-
- if (prefix)
- insert_string (",\n\t is a prefix character for `backward-prefix-chars'");
-
- insert_string ("\n");
- }
-
-
- static Lisp_Object
- describe_syntax_1 (vector)
- Lisp_Object vector;
- {
- struct buffer *old = current_buffer;
- int i, size = XVECTOR (vector)->size, range_start = 0;
- Lisp_Object string, current_code = XVECTOR (vector)->contents[0];
- int top;
-
- internal_set_buffer (XBUFFER (Vstandard_output));
-
- top = ((NILP (current_buffer->ctl_arrow) ||
- EQ (current_buffer->ctl_arrow, Qt))
- ? size : (FIXNUMP (current_buffer->ctl_arrow)
- ? XINT (current_buffer->ctl_arrow)
- : 0240));
- for (i = 1; i <= size; i++)
- {
- QUIT;
-
- if ((i == size ) ||
- (XINT (current_code) != XINT (XVECTOR (vector)->contents[i])))
- /* end of vector or end of range */
- {
- unsigned char c = range_start;
- if (c >= top)
- insert_raw_string ((char *) &c, 1);
- else
- {
- string = Fsingle_key_description (make_number (range_start));
- insert_raw_string ((char *) XSTRING (string)->data,
- XSTRING (string)->size);
- }
-
- if (i - range_start > 1) /* Really was a range */
- {
- insert_string (" .. ");
- c = i - 1;
- if (c >= top)
- insert_raw_string ((char *) &c, 1);
- else
- {
- string = Fsingle_key_description (make_number (i - 1));
- insert_raw_string ((char *) XSTRING (string)->data,
- XSTRING (string)->size);
- }
- describe_syntax (current_code);
- }
- describe_syntax (current_code);
- }
- range_start = i;
- if (i < size)
- current_code = XVECTOR (vector)->contents[i];
- }
-
- internal_set_buffer (old);
- return Qnil;
- }
-
- DEFUN ("describe-syntax", Fdescribe_syntax, Sdescribe_syntax, 0, 0, "",
- "Describe the syntax specifications in the syntax table.\n\
- The descriptions are inserted in a buffer, which is then displayed.")
- ()
- {
- internal_with_output_to_temp_buffer
- ("*Help*", describe_syntax_1, current_buffer->syntax_table, Qnil);
-
- return Qnil;
- }
-
- /* 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. */
-
- int
- scan_words (from, count)
- register int from, count;
- {
- register int beg = BEGV;
- register int end = ZV;
- register enum syntaxcode code;
-
- immediate_quit = 1;
- QUIT;
-
- while (count > 0)
- {
- while (1)
- {
- if (from == end)
- {
- immediate_quit = 0;
- return 0;
- }
- code = SYNTAX (CHAR_AT (from));
- if (words_include_escapes
- && (code == Sescape || code == Scharquote))
- break;
- if (code == Sword)
- break;
- from++;
- }
- while (1)
- {
- if (from == end) break;
- code = SYNTAX (CHAR_AT (from));
- if (!(words_include_escapes
- && (code == Sescape || code == Scharquote)))
- if (code != Sword)
- break;
- from++;
- }
- count--;
- }
- while (count < 0)
- {
- while (1)
- {
- if (from == beg)
- {
- immediate_quit = 0;
- return 0;
- }
- code = SYNTAX (CHAR_AT (from - 1));
- if (words_include_escapes
- && (code == Sescape || code == Scharquote))
- break;
- if (code == Sword)
- break;
- from--;
- }
- while (1)
- {
- if (from == beg) break;
- code = SYNTAX (CHAR_AT (from - 1));
- if (!(words_include_escapes
- && (code == Sescape || code == Scharquote)))
- if (code != Sword)
- break;
- from--;
- }
- count++;
- }
-
- immediate_quit = 0;
-
- return from;
- }
-
- DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 1, "p",
- "Move point forward ARG words (backward if ARG is negative).\n\
- Normally returns t.\n\
- If an edge of the buffer is reached, point is left there\n\
- and nil is returned.")
- (count)
- Lisp_Object count;
- {
- int val;
- CHECK_FIXNUM (count, 0);
-
- if (!(val = scan_words (point, XINT (count))))
- {
- SET_PT (XINT (count) > 0 ? ZV : BEGV);
- return Qnil;
- }
- SET_PT (val);
- zmacs_region_stays = 1;
- return Qt;
- }
-
- int parse_sexp_ignore_comments;
-
- static int char_quoted (int);
-
- #ifdef NEW_SYNTAX
-
- static int
- find_end_of_comment (from, stop, comstyle)
- int from, stop, comstyle;
- {
- register int c;
- register enum syntaxcode code;
- int stylemask = (comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A);
- int stylesmatch;
-
- while (from < stop)
- {
- c = CHAR_AT (from);
- code = SYNTAX (c);
- stylesmatch = (comstyle ? SYNTAX_SINGLE_CHAR_STYLE_B (c)
- : SYNTAX_SINGLE_CHAR_STYLE_A (c));
-
- /* ignore 1 char comment sequences with non-matching comstyle */
- if (code == Sendcomment && stylesmatch && !char_quoted (from))
- break;
-
- from++;
- if (from < stop && SYNTAX_PREFIX (c))
- { from++; continue; }
-
- /* only break on comment end sequence with matching comstyle */
- if (from < stop && SYNTAX_END_SEQUENCE (c, CHAR_AT (from), stylemask))
- break;
- }
- return from;
- }
-
-
- static int
- find_start_of_comment (from, stop, comstyle)
- int from, stop, comstyle;
- {
- /* 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 ofrom[2];
- int parity = 0;
- int stylesmatch;
- int c;
- enum syntaxcode code;
- int matching_start_found=0;
-
- ofrom[0] = ofrom[1] = from;
-
- /* At beginning of range to scan, we're outside of strings;
- that determines quote parity to the comment-end. */
- while (from != stop)
- {
- /* Move back and examine a character. */
- from--;
-
- c = CHAR_AT (from);
- code = SYNTAX (c);
-
- /* check to see if this character is part of a comment sequence
- of the appropriate style. if so, record the style of the comment
- found so that it can be matched later on */
- if (code == Scomment || code == Sendcomment)
- stylesmatch = (comstyle ? SYNTAX_SINGLE_CHAR_STYLE_B (c) :
- SYNTAX_SINGLE_CHAR_STYLE_A (c));
-
- /* If this char is the second of a 2-char comment sequence,
- back up and give the pair the appropriate syntax. */
- else if (from > stop && SYNTAX_START (CHAR_AT (from-1), c))
- {
- if (stylesmatch = SYNTAX_START_SEQUENCE
- (CHAR_AT (from-1), c,
- (comstyle ? SYNTAX_COMMENT_STYLE_B
- : SYNTAX_COMMENT_STYLE_A)))
- from--;
- code = Scomment;
- }
- else if (from > stop && SYNTAX_END (CHAR_AT (from-1), c))
- {
- if (stylesmatch = SYNTAX_END_SEQUENCE
- (CHAR_AT (from-1), c,
- (comstyle ? SYNTAX_COMMENT_STYLE_B
- : SYNTAX_COMMENT_STYLE_A)))
- from--;
- code = Sendcomment;
- }
-
- /* Ignore escaped characters. */
- if (char_quoted (from))
- continue;
-
- /* Track parity of quotes between here and comment-end. */
- if (code == Sstring)
- parity ^= 1;
-
- /* Record comment-starters according to that
- quote-parity to the comment-end. */
- if (code == Scomment && stylesmatch)
- {
- ofrom[parity] = from;
- matching_start_found = 1;
- }
-
- /* If we come to another comment-end, assume it's not inside a
- string. note that if we've found a comment start of the matching
- style, any subsequent preceding endcoment satisfies.
- That determines the quote parity to the comment-end. */
- if (code == Sendcomment &&
- (matching_start_found ? 1 : stylesmatch))
- break;
- }
- return ofrom[parity];
- }
- }
-
-
- DEFUN ("backward-syntactic-ws", Fbackward_syntactic_ws, Sbackward_syntactic_ws,
- 0, 0, 0,
- "Move point backward over all syntactic whitespace.\n\
- This includes all chars with \"whitespace\" syntax (Space), and, if\n\
- parse-sexp-ignore-comments is non-nil, all characters within comments.")
- ()
- {
- int beg = BEGV;
- register int pos = point;
- int c;
- enum syntaxcode code;
- int comstyle;
- int stylemask = SYNTAX_COMMENT_STYLE_B;
-
- while (pos > beg)
- {
- pos--;
- if (char_quoted (pos))
- { pos--; continue; }
-
- c = CHAR_AT (pos);
- code = SYNTAX (c);
-
- if (code == Scomment || code == Sendcomment)
- comstyle = SYNTAX_SINGLE_CHAR_STYLE_B (c);
-
- else if (pos > beg
- && SYNTAX_END (CHAR_AT (pos-1), c)
- && !char_quoted (pos-1)
- && parse_sexp_ignore_comments)
- {
- code = Sendcomment;
- comstyle = SYNTAX_END_SEQUENCE (CHAR_AT (pos-1), c, stylemask);
- pos--;
- }
-
- if (code == Sendcomment && parse_sexp_ignore_comments)
- pos = find_start_of_comment (pos, beg, comstyle);
-
- else if (code != Swhitespace &&
- SYNTAX (c) != Scomment &&
- SYNTAX (c) != Sendcomment)
- break;
- }
-
- SET_PT (pos);
- return Qnil;
- }
-
- DEFUN ("forward-syntactic-ws", Fforward_syntactic_ws, Sforward_syntactic_ws,
- 0, 0, 0,
- "Move point forward over all syntactic whitespace.\n\
- This includes all chars with \"whitespace\" syntax (Space), and, if\n\
- parse-sexp-ignore-comments is non-nil, all characters within comments.")
- ()
- {
- int end = ZV;
- register int pos = point;
- int c;
- enum syntaxcode code;
- int comstyle;
- int stylemask = SYNTAX_COMMENT_STYLE_B;
-
- while (pos < end)
- {
- if (char_quoted (pos))
- { pos++; continue; }
-
- c = CHAR_AT (pos);
- code = SYNTAX (c);
-
- if (code == Scomment)
- comstyle = SYNTAX_SINGLE_CHAR_STYLE_B (c);
-
- else if (pos < end
- && SYNTAX_START (c, (CHAR_AT (pos+1)))
- && !char_quoted (pos+1)
- && parse_sexp_ignore_comments)
- {
- code = Scomment;
- comstyle = SYNTAX_START_SEQUENCE (c, (CHAR_AT (pos+1)), stylemask);
- pos++;
- }
-
- if (code == Scomment && parse_sexp_ignore_comments)
- pos = find_end_of_comment (pos, end, comstyle);
-
- else if (code != Swhitespace &&
- SYNTAX (c) != Scomment &&
- SYNTAX (c) != Sendcomment )
- break;
-
- pos++;
- }
-
- SET_PT (pos);
- return Qnil;
- }
-
- #endif /* NEW_SYNTAX */
-
-
- Lisp_Object
- scan_lists (from, count, depth, sexpflag)
- register int from;
- int count, depth, sexpflag;
- {
- Lisp_Object val;
- register int stop;
- register int c;
- char stringterm;
- int quoted;
- int mathexit = 0;
- register enum syntaxcode code;
- int min_depth = depth; /* Err out if depth gets less than this. */
- #ifdef NEW_SYNTAX
- int comstyle; /* for keeping track of comment style */
- int stylemask = SYNTAX_COMMENT_STYLE_B;
- #endif /* NEW_SYNTAX */
-
- if (depth > 0) min_depth = 0;
-
- immediate_quit = 1;
- QUIT;
-
- while (count > 0)
- {
- stop = ZV;
- while (from < stop)
- {
- c = CHAR_AT (from);
- code = SYNTAX(c);
-
- from++;
-
- #ifdef NEW_SYNTAX
-
- if (code == Scomment || code == Sendcomment)
- comstyle = SYNTAX_SINGLE_CHAR_STYLE_B (c);
-
- else if (from < stop
- && SYNTAX_START (c, (CHAR_AT (from)))
- && parse_sexp_ignore_comments)
- {
- code = Scomment;
- comstyle = SYNTAX_START_SEQUENCE(c, (CHAR_AT (from)), stylemask);
- from++;
- }
-
- #else /* !NEW_SYNTAX */
-
- if (from < stop && SYNTAX_COMSTART_FIRST (c)
- && SYNTAX_COMSTART_SECOND (CHAR_AT (from))
- && parse_sexp_ignore_comments)
- code = Scomment, from++;
-
- #endif /* NEW_SYNTAX */
-
- if (SYNTAX_PREFIX (c))
- continue;
-
- #ifdef SWITCH_ENUM_BUG
- switch ((int) code)
- #else
- switch (code)
- #endif
- {
- 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)
- {
- #ifdef SWITCH_ENUM_BUG
- switch ((int) SYNTAX(CHAR_AT (from)))
- #else
- switch (SYNTAX(CHAR_AT (from)))
- #endif
- {
- 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:
- if (!parse_sexp_ignore_comments) break;
- #ifdef NEW_SYNTAX
- from = find_end_of_comment (from, stop, comstyle);
- if (from == stop) goto done;
- #else /* !NEW_SYNTAX */
- while (1)
- {
- if (from == stop) goto done;
- if (SYNTAX (c = CHAR_AT (from)) == Sendcomment)
- break;
- from++;
- if (from < stop && SYNTAX_COMEND_FIRST (c)
- && SYNTAX_COMEND_SECOND (CHAR_AT (from)))
- { from++; break; }
- }
- #endif /* NEW_SYNTAX */
- break;
-
- case Smath:
- if (!sexpflag)
- break;
- if (from != stop && c == CHAR_AT (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)
- error ("Containing expression ends prematurely");
- break;
-
- case Sstring:
- stringterm = CHAR_AT (from - 1);
- while (1)
- {
- if (from >= stop) goto lose;
- if (CHAR_AT (from) == stringterm) break;
- #ifdef SWITCH_ENUM_BUG
- switch ((int) SYNTAX(CHAR_AT (from)))
- #else
- switch (SYNTAX(CHAR_AT (from)))
- #endif
- {
- case Scharquote:
- case Sescape:
- from++;
- }
- from++;
- }
- from++;
- if (!depth && sexpflag) goto done;
- break;
- }
- }
-
- /* Reached end of buffer. Error if within object, return nil if between */
- if (depth) goto lose;
-
- immediate_quit = 0;
- return Qnil;
-
- /* End of object reached */
- done:
- count--;
- }
-
- while (count < 0)
- {
- stop = BEGV;
- while (from > stop)
- {
- from--;
- if (quoted = char_quoted (from))
- from--;
-
- c = CHAR_AT (from);
- code = SYNTAX (c);
-
- #ifdef NEW_SYNTAX
-
- if (code == Scomment || code == Sendcomment)
- comstyle = SYNTAX_SINGLE_CHAR_STYLE_B (c);
-
- else if (from > stop
- && SYNTAX_END (CHAR_AT (from-1), c)
- && !char_quoted (from-1)
- && parse_sexp_ignore_comments)
- {
- code = Sendcomment;
- comstyle = SYNTAX_END_SEQUENCE (CHAR_AT (from-1), c, stylemask);
- from--;
- }
-
- #else /* !NEW_SYNTAX */
-
- if (from > stop && SYNTAX_COMEND_SECOND (c)
- && SYNTAX_COMEND_FIRST (CHAR_AT (from - 1))
- && !char_quoted (from - 1)
- && parse_sexp_ignore_comments)
- code = Sendcomment, from--;
-
- #endif /* NEW_SYNTAX */
-
- if (SYNTAX_PREFIX (c))
- continue;
-
- #ifdef SWITCH_ENUM_BUG
- switch ((int) (quoted ? Sword : code))
- #else
- switch (quoted ? Sword : code)
- #endif
- {
- case Sword:
- case Ssymbol:
- if (depth || !sexpflag) break;
- /* This word counts as a sexp; count object finished after
- passing it. */
- while (from > stop)
- {
- quoted = char_quoted (from - 1);
- if (quoted)
- from--;
- if (! (quoted || SYNTAX(CHAR_AT (from - 1)) == Sword
- || SYNTAX(CHAR_AT (from - 1)) == Ssymbol
- || SYNTAX(CHAR_AT (from - 1)) == Squote))
- goto done2;
- from--;
- }
- goto done2;
-
- case Smath:
- if (!sexpflag)
- break;
- if (from != stop && c == CHAR_AT (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)
- error ("Containing expression ends prematurely");
- break;
-
- case Sendcomment:
- if (!parse_sexp_ignore_comments)
- break;
- #ifdef NEW_SYNTAX
-
- from = find_start_of_comment (from, stop, comstyle);
-
- #else /* !NEW_SYNTAX */
-
- /* 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 ofrom[2];
- int parity = 0;
-
- ofrom[0] = ofrom[1] = from;
-
- /* At beginning of range to scan, we're outside of strings;
- that determines quote parity to the comment-end. */
- while (from != stop)
- {
- /* Move back and examine a character. */
- from--;
-
- c = CHAR_AT (from);
- code = SYNTAX (c);
-
- /* If this char is the second of a 2-char comment sequence,
- back up and give the pair the appropriate syntax. */
- if (from > stop && SYNTAX_COMEND_SECOND (c)
- && SYNTAX_COMEND_FIRST (CHAR_AT (from - 1)))
- code = Sendcomment, from--;
- else if (from > stop && SYNTAX_COMSTART_SECOND (c)
- && SYNTAX_COMSTART_FIRST (CHAR_AT (from - 1)))
- code = Scomment, from--;
-
- /* Ignore escaped characters. */
- if (char_quoted (from))
- continue;
-
- /* Track parity of quotes between here and comment-end. */
- if (code == Sstring)
- parity ^= 1;
-
- /* Record comment-starters according to that
- quote-parity to the comment-end. */
- if (code == Scomment)
- ofrom[parity] = from;
-
- /* If we come to another comment-end,
- assume it's not inside a string.
- That determines the quote parity to the comment-end. */
- if (code == Sendcomment)
- break;
- }
- from = ofrom[parity];
- }
-
- #endif /* NEW_SYNTAX */
-
- break;
-
- case Sstring:
- stringterm = CHAR_AT (from);
- while (1)
- {
- if (from == stop) goto lose;
- if (!char_quoted (from - 1)
- && stringterm == CHAR_AT (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;
-
- immediate_quit = 0;
- return Qnil;
-
- done2:
- count++;
- }
-
-
- immediate_quit = 0;
- XFASTINT (val) = from;
- return val;
-
- lose:
- error ("Unbalanced parentheses");
- /* NOTREACHED */
- return Qnil; /* warning suppression */
- }
-
- static int
- char_quoted (pos)
- register int pos;
- {
- register enum syntaxcode code;
- register int beg = BEGV;
- register int quoted = 0;
-
- while (pos > beg
- && ((code = SYNTAX (CHAR_AT (pos - 1))) == Scharquote
- || code == Sescape))
- pos--, quoted = !quoted;
- return quoted;
- }
-
- DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 3, 0,
- "Scan from character number FROM by COUNT lists.\n\
- Returns the character number of the position thus found.\n\
- \n\
- If DEPTH is nonzero, paren depth begins counting from that value,\n\
- only places where the depth in parentheses becomes zero\n\
- are candidates for stopping; COUNT such places are counted.\n\
- Thus, a positive value for DEPTH means go out levels.\n\
- \n\
- Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\
- \n\
- If the beginning or end of (the accessible part of) the buffer is reached\n\
- and the depth is wrong, an error is signaled.\n\
- If the depth is right but the count is not used up, nil is returned.")
- (from, count, depth)
- Lisp_Object from, count, depth;
- {
- CHECK_FIXNUM (from, 0);
- CHECK_FIXNUM (count, 1);
- CHECK_FIXNUM (depth, 2);
-
- return scan_lists (XINT (from), XINT (count), XINT (depth), 0);
- }
-
- DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 2, 0,
- "Scan from character number FROM by COUNT balanced expressions.\n\
- If COUNT is negative, scan backwards.\n\
- Returns the character number of the position thus found.\n\
- \n\
- Comments are ignored if `parse-sexp-ignore-comments' is non-nil.\n\
- \n\
- If the beginning or end of (the accessible part of) the buffer is reached\n\
- in the middle of a parenthetical grouping, an error is signaled.\n\
- If the beginning or end is reached between groupings\n\
- but before count is used up, nil is returned.")
- (from, count)
- Lisp_Object from, count;
- {
- CHECK_FIXNUM (from, 0);
- CHECK_FIXNUM (count, 1);
-
- return scan_lists (XINT (from), XINT (count), 0, 1);
- }
-
- DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars,
- 0, 0, 0,
- "Move point backward over any number of chars with prefix syntax.\n\
- This includes chars with \"quote\" or \"prefix\" syntax (' or p).")
- ()
- {
- int beg = BEGV;
- int pos = point;
-
- while (pos > beg && !char_quoted (pos - 1)
- && (SYNTAX (CHAR_AT (pos - 1)) == Squote
- || SYNTAX_PREFIX (CHAR_AT (pos - 1))))
- pos--;
-
- SET_PT (pos);
-
- return Qnil;
- }
-
- struct lisp_parse_state
- {
- int depth; /* Depth at end of parsing */
- int instring; /* -1 if not within string, else desired terminator. */
- int incomment; /* Nonzero if within a comment at end of parsing */
- #ifdef NEW_SYNTAX
- int comstyle; /* comment style: a or b */
- #endif /* NEW_SYNTAX */
- int quoted; /* Nonzero if just after an escape char at end of parsing */
- int thislevelstart; /* Char number of most recent start-of-expression at current level */
- int prevlevelstart; /* Char number of start of containing expression */
- int location; /* Char number at which parsing stopped. */
- int mindepth; /* Minimum depth seen while scanning. */
- };
-
- /* Parse forward from FROM to END,
- assuming that FROM is the start of a function,
- and return a description of the state of the parse at END. */
-
- static struct lisp_parse_state val_scan_sexps_forward;
-
- static struct lisp_parse_state *
- scan_sexps_forward (from, end, targetdepth, stopbefore, oldstate)
- register int from;
- int end, targetdepth, stopbefore;
- Lisp_Object oldstate;
- {
- struct lisp_parse_state state;
-
- register enum syntaxcode code;
- struct level { int last, prev; };
- struct level levelstart[100];
- register struct level *curlevel = levelstart;
- struct level *endlevel = levelstart + 100;
- char prev;
- register 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 */
- Lisp_Object tem;
-
- #ifdef NEW_SYNTAX
- int stylemask = SYNTAX_COMMENT_STYLE_B;
- #endif /* NEW_SYNTAX */
-
- immediate_quit = 1;
- QUIT;
-
- if (NILP (oldstate))
- {
- depth = 0;
- state.instring = -1;
- state.incomment = 0;
- #ifdef NEW_SYNTAX
- state.comstyle = 0; /* default comstyle is a */
- #endif /* NEW_SYNTAX */
- }
- else
- {
- tem = Fcar (oldstate);
- if (!NILP (tem))
- depth = XINT (tem);
- else
- depth = 0;
-
- oldstate = Fcdr (oldstate);
- oldstate = Fcdr (oldstate);
- oldstate = Fcdr (oldstate);
- tem = Fcar (oldstate);
- state.instring = !NILP (tem) ? XINT (tem) : -1;
-
- oldstate = Fcdr (oldstate);
- tem = Fcar (oldstate);
- state.incomment = !NILP (tem);
-
- oldstate = Fcdr (oldstate);
- tem = Fcar (oldstate);
- start_quoted = !NILP (tem);
-
- #ifdef NEW_SYNTAX
- /* if eighth element of the list is nil, we are in comment style
- a. if it is non-nil, we are in comment style b */
- oldstate = Fcdr (oldstate);
- oldstate = Fcdr (oldstate);
- oldstate = Fcdr (oldstate);
- tem = Fcar (oldstate);
- state.comstyle = !NILP (tem);
- #endif /* NEW_SYNTAX */
-
- }
- 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)
- {
- code = SYNTAX(CHAR_AT (from));
- from++;
-
- #ifdef NEW_SYNTAX
-
- if (code == Scomment || code == Sendcomment)
- state.comstyle = SYNTAX_SINGLE_CHAR_STYLE_B (CHAR_AT (from-1));
-
- else if (from < end && SYNTAX_START (CHAR_AT (from-1), (CHAR_AT (from))))
- {
- code = Scomment;
- state.comstyle =
- SYNTAX_START_SEQUENCE(CHAR_AT (from-1), CHAR_AT (from), stylemask);
- from++;
- }
-
- #else /* !NEW_SYNTAX */
-
- if (from < end && SYNTAX_COMSTART_FIRST (CHAR_AT (from - 1))
- && SYNTAX_COMSTART_SECOND (CHAR_AT (from)))
- code = Scomment, from++;
-
- #endif /* NEW_SYNTAX */
-
- if (SYNTAX_PREFIX (CHAR_AT (from - 1)))
- continue;
- #ifdef SWITCH_ENUM_BUG
- switch ((int) code)
- #else
- switch (code)
- #endif
- {
- 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)
- {
- #ifdef SWITCH_ENUM_BUG
- switch ((int) SYNTAX(CHAR_AT (from)))
- #else
- switch (SYNTAX(CHAR_AT (from)))
- #endif
- {
- 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;
- startincomment:
-
- #ifdef NEW_SYNTAX
-
- from = find_end_of_comment (from, end, state.comstyle);
- if (from == end) goto done;
-
- #else /* !NEW_SYNTAX */
-
- while (1)
- {
- if (from == end) goto done;
- if (SYNTAX (prev = CHAR_AT (from)) == Sendcomment)
- break;
- from++;
- if (from < end && SYNTAX_COMEND_FIRST (prev)
- && SYNTAX_COMEND_SECOND (CHAR_AT (from)))
- { from++; break; }
- }
-
- #endif /* NEW_SYNTAX */
-
- state.incomment = 0;
- 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) goto done;
- break;
-
- case Sclose:
- depth--;
- if (depth < mindepth)
- mindepth = depth;
- if (curlevel != levelstart)
- curlevel--;
- curlevel->prev = curlevel->last;
- if (!++targetdepth) goto done;
- break;
-
- case Sstring:
- if (stopbefore) goto stop; /* this arg means stop at sexp start */
- curlevel->last = from - 1;
- state.instring = CHAR_AT (from - 1);
- startinstring:
- while (1)
- {
- if (from >= end) goto done;
- if (CHAR_AT (from) == state.instring) break;
- #ifdef SWITCH_ENUM_BUG
- switch ((int) SYNTAX(CHAR_AT (from)))
- #else
- switch (SYNTAX(CHAR_AT (from)))
- #endif
- {
- case Scharquote:
- case Sescape:
- from++;
- startquotedinstring:
- if (from >= end) goto endquoted;
- }
- from++;
- }
- state.instring = -1;
- curlevel->prev = curlevel->last;
- from++;
- break;
-
- case Smath:
- 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;
- immediate_quit = 0;
-
- val_scan_sexps_forward = state;
- return &val_scan_sexps_forward;
- }
-
- #ifdef NEW_SYNTAX
-
- /* This comment supplies the doc string for parse-partial-sexp,
- for make-docfile to see. We cannot put this in the real DEFUN
- due to limits in the Unix cpp.
-
- DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 5, 0,
- "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\
- Parsing stops at TO or when certain criteria are met;\n\
- point is set to where parsing stops.\n\
- If fifth arg STATE is omitted or nil,\n\
- parsing assumes that FROM is the beginning of a function.\n\
- Value is a list of eight elements describing final state of parsing:\n\
- 1. depth in parens.\n\
- 2. character address of start of innermost containing list; nil if none.\n\
- 3. character address of start of last complete sexp terminated.\n\
- 4. non-nil if inside a string.\n\
- (it is the character that will terminate the string.)\n\
- 5. t if inside a comment.\n\
- 6. t if following a quote character.\n\
- 7. the minimum paren-depth encountered during this scan.\n\
- 8. nil if in comment style a, or not in a comment; t if in comment style b\n\
- If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\
- in parentheses becomes equal to TARGETDEPTH.\n\
- Fourth arg STOPBEFORE non-nil means stop when come to\n\
- any character that starts a sexp.\n\
- Fifth arg STATE is a seven-list like what this function returns.\n\
- It is used to initialize the state of the parse.")
- (from, to, targetdepth, stopbefore, oldstate)
- */
-
- #else /* !NEW_SYNTAX */
-
- /* This comment supplies the doc string for parse-partial-sexp,
- for make-docfile to see. We cannot put this in the real DEFUN
- due to limits in the Unix cpp.
-
- ****DEFUN ("parse-partial-sexp", Ffoo, Sfoo, 2, 5, 0,
- "Parse Lisp syntax starting at FROM until TO; return status of parse at TO.\n\
- Parsing stops at TO or when certain criteria are met;\n\
- point is set to where parsing stops.\n\
- If fifth arg STATE is omitted or nil,\n\
- parsing assumes that FROM is the beginning of a function.\n\
- Value is a list of seven elements describing final state of parsing:\n\
- 1. depth in parens.\n\
- 2. character address of start of innermost containing list; nil if none.\n\
- 3. character address of start of last complete sexp terminated.\n\
- 4. non-nil if inside a string.\n\
- (it is the character that will terminate the string.)\n\
- 5. t if inside a comment.\n\
- 6. t if following a quote character.\n\
- 7. the minimum paren-depth encountered during this scan.\n\
- If third arg TARGETDEPTH is non-nil, parsing stops if the depth\n\
- in parentheses becomes equal to TARGETDEPTH.\n\
- Fourth arg STOPBEFORE non-nil means stop when come to\n\
- any character that starts a sexp.\n\
- Fifth arg STATE is a seven-list like what this function returns.\n\
- It is used to initialize the state of the parse.")
- (from, to, targetdepth, stopbefore, oldstate)
- */
-
- #endif /* NEW_SYNTAX */
-
- DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 5, 0,
- 0 /* See immediately above */)
- (from, to, targetdepth, stopbefore, oldstate)
- Lisp_Object from, to, targetdepth, stopbefore, oldstate;
- {
- struct lisp_parse_state state;
- int target;
-
- if (!NILP (targetdepth))
- {
- CHECK_FIXNUM (targetdepth, 3);
- target = XINT (targetdepth);
- }
- else
- target = -100000; /* We won't reach this depth */
-
- validate_region (&from, &to);
- state = *scan_sexps_forward (XINT (from), XINT (to),
- target, !NILP (stopbefore), oldstate);
-
- SET_PT (state.location);
-
- return Fcons (make_number (state.depth),
- Fcons (state.prevlevelstart < 0 ? Qnil : make_number (state.prevlevelstart),
- Fcons (state.thislevelstart < 0 ? Qnil : make_number (state.thislevelstart),
- Fcons (state.instring >= 0 ? make_number (state.instring) : Qnil,
- Fcons (state.incomment ? Qt : Qnil,
- Fcons (state.quoted ? Qt : Qnil,
- #ifdef NEW_SYNTAX
- Fcons (make_number (state.mindepth),
- Fcons (state.comstyle ? Qt : Qnil,
- Qnil))))))));
- #else /* !NEW_SYNTAX */
- Fcons (make_number (state.mindepth), Qnil)))))));
- #endif /* NEW_SYNTAX */
- }
-
- void
- init_syntax_once ()
- {
- register int i;
- register struct Lisp_Vector *v;
-
- /* 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);
-
- v = XVECTOR (Vstandard_syntax_table);
-
- for (i = 'a'; i <= 'z'; i++)
- XFASTINT (v->contents[i]) = (int) Sword;
- for (i = 'A'; i <= 'Z'; i++)
- XFASTINT (v->contents[i]) = (int) Sword;
- for (i = '0'; i <= '9'; i++)
- XFASTINT (v->contents[i]) = (int) Sword;
- XFASTINT (v->contents['$']) = (int) Sword;
- XFASTINT (v->contents['%']) = (int) Sword;
-
- XFASTINT (v->contents['(']) = (int) Sopen + (')' << 8);
- XFASTINT (v->contents[')']) = (int) Sclose + ('(' << 8);
- XFASTINT (v->contents['[']) = (int) Sopen + (']' << 8);
- XFASTINT (v->contents[']']) = (int) Sclose + ('[' << 8);
- XFASTINT (v->contents['{']) = (int) Sopen + ('}' << 8);
- XFASTINT (v->contents['}']) = (int) Sclose + ('{' << 8);
- XFASTINT (v->contents['"']) = (int) Sstring;
- XFASTINT (v->contents['\\']) = (int) Sescape;
-
- for (i = 0; i < 10; i++)
- XFASTINT (v->contents["_-+*/&|<>="[i]]) = (int) Ssymbol;
-
- for (i = 0; i < 12; i++)
- XFASTINT (v->contents[".,;:?!#@~^'`"[i]]) = (int) Spunct;
- }
-
- void
- syms_of_syntax ()
- {
- Qsyntax_table_p = intern ("syntax-table-p");
- staticpro (&Qsyntax_table_p);
-
- DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments,
- "Non-nil means `forward-sexp', etc., should treat comments as whitespace.");
-
- words_include_escapes = 0;
- DEFVAR_BOOL ("words-include-escapes", &words_include_escapes,
- "Non-nil means `forward-word', etc., should treat escape chars part of words.");
-
- defsubr (&Ssyntax_table_p);
- defsubr (&Ssyntax_table);
- defsubr (&Sstandard_syntax_table);
- defsubr (&Scopy_syntax_table);
- defsubr (&Sset_syntax_table);
- defsubr (&Schar_syntax);
- defsubr (&Smodify_syntax_entry);
- defsubr (&Sdescribe_syntax);
-
- defsubr (&Sforward_word);
-
- defsubr (&Sscan_lists);
- defsubr (&Sscan_sexps);
- defsubr (&Sbackward_prefix_chars);
-
- #ifdef NEW_SYNTAX
- defsubr (&Sbackward_syntactic_ws);
- defsubr (&Sforward_syntactic_ws);
- #endif /* NEW_SYNTAX */
-
- defsubr (&Sparse_partial_sexp);
- }
-