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e0b8ff939d
characters. (SYNTAX_ENTRY_FOLLOW_PARENT): New macro. (SYNTAX_ENTRY): Handle syntax of multibyte characters. (SYNTAX, SYNTAX_WITH_FLAGS, SYNTAX_MATCH): Don't signal error even if a syntax entry is not cons.
178 lines
6.5 KiB
C
178 lines
6.5 KiB
C
/* Declarations having to do with GNU Emacs syntax tables.
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Copyright (C) 1985, 1993, 1994 Free Software Foundation, Inc.
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This file is part of GNU Emacs.
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GNU Emacs is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Emacs is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Emacs; see the file COPYING. If not, write to
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the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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extern Lisp_Object Qsyntax_table_p;
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extern Lisp_Object Fsyntax_table_p (), Fsyntax_table (), Fset_syntax_table ();
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/* The standard syntax table is stored where it will automatically
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be used in all new buffers. */
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#define Vstandard_syntax_table buffer_defaults.syntax_table
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/* A syntax table is a chartable whose elements are cons cells
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(CODE+FLAGS . MATCHING-CHAR). MATCHING-CHAR can be nil if the char
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is not a kind of parenthesis.
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The low 8 bits of CODE+FLAGS is a code, as follows: */
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enum syntaxcode
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{
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Swhitespace, /* for a whitespace character */
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Spunct, /* for random punctuation characters */
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Sword, /* for a word constituent */
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Ssymbol, /* symbol constituent but not word constituent */
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Sopen, /* for a beginning delimiter */
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Sclose, /* for an ending delimiter */
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Squote, /* for a prefix character like Lisp ' */
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Sstring, /* for a string-grouping character like Lisp " */
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Smath, /* for delimiters like $ in Tex. */
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Sescape, /* for a character that begins a C-style escape */
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Scharquote, /* for a character that quotes the following character */
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Scomment, /* for a comment-starting character */
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Sendcomment, /* for a comment-ending character */
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Sinherit, /* use the standard syntax table for this character */
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Smax /* Upper bound on codes that are meaningful */
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};
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/* Set the syntax entry VAL for char C in table TABLE. */
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#define SET_RAW_SYNTAX_ENTRY(table, c, val) \
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((unsigned)(c) < 128 \
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? (XCHAR_TABLE (table)->contents[(unsigned) (c)] = (val)) \
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: Faset ((table), (unsigned) (c), (val)))
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/* Fetch the syntax entry for char C in syntax table TABLE.
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This macro is called only when C is less than CHAR_TABLE_ORDINARY_SLOTS.
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Do inheritance. */
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#ifdef __GNUC__
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#define SYNTAX_ENTRY_FOLLOW_PARENT(table, c) \
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({ Lisp_Object tbl = table; \
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Lisp_Object temp = XCHAR_TABLE (tbl)->contents[(c)]; \
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while (NILP (temp)) \
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{ \
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tbl = XCHAR_TABLE (tbl)->parent; \
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if (NILP (tbl)) \
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break; \
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temp = XCHAR_TABLE (tbl)->contents[(c)]; \
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} \
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temp; })
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#else
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extern Lisp_Object syntax_temp;
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extern Lisp_Object syntax_parent_lookup ();
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#define SYNTAX_ENTRY_FOLLOW_PARENT(table, c) \
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(syntax_temp = XCHAR_TABLE (table)->contents[(c)], \
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(NILP (syntax_temp) \
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? syntax_parent_lookup (table, (c)) \
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: syntax_temp))
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#endif
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/* Fetch the syntax entry for char C in the current syntax table.
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This returns the whole entry (normally a cons cell).
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Do Inheritance. */
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#define SYNTAX_ENTRY(c) \
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((unsigned) (c) < CHAR_TABLE_ORDINARY_SLOTS \
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? SYNTAX_ENTRY_FOLLOW_PARENT (current_buffer->syntax_table, (unsigned) (c))\
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: Faref (current_buffer->syntax_table, make_number (c)))
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/* Extract the information from the entry for character C
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in the current syntax table. */
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#ifdef __GNUC__
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#define SYNTAX(c) \
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({ Lisp_Object temp; \
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temp = SYNTAX_ENTRY (c); \
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(CONSP (temp) \
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? (enum syntaxcode) (XINT (XCONS (temp)->car) & 0xff) \
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: Swhitespace); })
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#define SYNTAX_WITH_FLAGS(c) \
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({ Lisp_Object temp; \
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temp = SYNTAX_ENTRY (c); \
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(CONSP (temp) \
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? XINT (XCONS (temp)->car) \
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: (int) Swhitespace); })
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#define SYNTAX_MATCH(c) \
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({ Lisp_Object temp; \
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temp = SYNTAX_ENTRY (c); \
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(CONSP (temp) \
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? XINT (XCONS (temp)->cdr) \
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: Qnil); })
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#else
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#define SYNTAX(c) \
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(syntax_temp = SYNTAX_ENTRY ((c)), \
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(CONSP (syntax_temp) \
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? (enum syntaxcode) (XINT (XCONS (syntax_temp)->car) & 0xff) \
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: Swhitespace))
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#define SYNTAX_WITH_FLAGS(c) \
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(syntax_temp = SYNTAX_ENTRY ((c)), \
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(CONSP (syntax_temp) \
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? XINT (XCONS (syntax_temp)->car) \
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: (int) Swhitespace))
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#define SYNTAX_MATCH(c) \
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(syntax_temp = SYNTAX_ENTRY ((c)), \
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(CONSP (syntax_temp) \
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? XINT (XCONS (syntax_temp)->cdr) \
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: Qnil))
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#endif
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/* Then there are six single-bit flags that have the following meanings:
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1. This character is the first of a two-character comment-start sequence.
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2. This character is the second of a two-character comment-start sequence.
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3. This character is the first of a two-character comment-end sequence.
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4. This character is the second of a two-character comment-end sequence.
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5. This character is a prefix, for backward-prefix-chars.
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Note that any two-character sequence whose first character has flag 1
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and whose second character has flag 2 will be interpreted as a comment start.
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bit 6 is used to discriminate between two different comment styles.
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Languages such as C++ allow two orthogonal syntax start/end pairs
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and bit 6 is used to determine whether a comment-end or Scommentend
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ends style a or b. Comment start sequences can start style a or b.
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Style a is always the default.
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*/
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#define SYNTAX_COMSTART_FIRST(c) ((SYNTAX_WITH_FLAGS (c) >> 16) & 1)
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#define SYNTAX_COMSTART_SECOND(c) ((SYNTAX_WITH_FLAGS (c) >> 17) & 1)
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#define SYNTAX_COMEND_FIRST(c) ((SYNTAX_WITH_FLAGS (c) >> 18) & 1)
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#define SYNTAX_COMEND_SECOND(c) ((SYNTAX_WITH_FLAGS (c) >> 19) & 1)
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#define SYNTAX_PREFIX(c) ((SYNTAX_WITH_FLAGS (c) >> 20) & 1)
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/* extract the comment style bit from the syntax table entry */
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#define SYNTAX_COMMENT_STYLE(c) ((SYNTAX_WITH_FLAGS (c) >> 21) & 1)
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/* This array, indexed by a character, contains the syntax code which that
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character signifies (as a char). For example,
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(enum syntaxcode) syntax_spec_code['w'] is Sword. */
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extern unsigned char syntax_spec_code[0400];
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/* Indexed by syntax code, give the letter that describes it. */
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extern char syntax_code_spec[14];
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