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428
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1 /* Declarations having to do with XEmacs syntax tables.
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2 Copyright (C) 1985, 1992, 1993 Free Software Foundation, Inc.
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793
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3 Copyright (C) 2002 Ben Wing.
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428
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: FSF 19.28. */
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23
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440
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24 #ifndef INCLUDED_syntax_h_
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25 #define INCLUDED_syntax_h_
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428
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26
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27 #include "chartab.h"
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28
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29 /* A syntax table is a type of char table.
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30
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31 The low 7 bits of the integer is a code, as follows. The 8th bit is
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32 used as the prefix bit flag (see below).
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33
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34 The values in a syntax table are either integers or conses of
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35 integers and chars. The lowest 7 bits of the integer are the syntax
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36 class. If this is Sinherit, then the actual syntax value needs to
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37 be retrieved from the standard syntax table.
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38
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39 Since the logic involved in finding the actual integer isn't very
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40 complex, you'd think the time required to retrieve it is not a
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41 factor. If you thought that, however, you'd be wrong, due to the
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42 high number of times (many per character) that the syntax value is
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43 accessed in functions such as scan_lists(). To speed this up,
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44 we maintain a mirror syntax table that contains the actual
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45 integers. We can do this successfully because syntax tables are
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46 now an abstract type, where we control all access.
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47 */
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48
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49 enum syntaxcode
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50 {
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51 Swhitespace, /* whitespace character */
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52 Spunct, /* random punctuation character */
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53 Sword, /* word constituent */
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54 Ssymbol, /* symbol constituent but not word constituent */
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55 Sopen, /* a beginning delimiter */
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56 Sclose, /* an ending delimiter */
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57 Squote, /* a prefix character like Lisp ' */
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58 Sstring, /* a string-grouping character like Lisp " */
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59 Smath, /* delimiters like $ in TeX. */
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60 Sescape, /* a character that begins a C-style escape */
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61 Scharquote, /* a character that quotes the following character */
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62 Scomment, /* a comment-starting character */
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63 Sendcomment, /* a comment-ending character */
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64 Sinherit, /* use the standard syntax table for this character */
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460
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65 Scomment_fence, /* Starts/ends comment which is delimited on the
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66 other side by a char with the same syntaxcode. */
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67 Sstring_fence, /* Starts/ends string which is delimited on the
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68 other side by a char with the same syntaxcode. */
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428
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69 Smax /* Upper bound on codes that are meaningful */
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70 };
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71
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72 enum syntaxcode charset_syntax (struct buffer *buf, Lisp_Object charset,
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73 int *multi_p_out);
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74
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75 /* Return the syntax code for a particular character and mirror table. */
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76
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826
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77 #define SYNTAX_CODE(table, c) XINT (get_char_table (c, table))
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428
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78
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79 #define SYNTAX_FROM_CODE(code) ((enum syntaxcode) ((code) & 0177))
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826
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80
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428
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81 #define SYNTAX(table, c) SYNTAX_FROM_CODE (SYNTAX_CODE (table, c))
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82
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826
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83 DECLARE_INLINE_HEADER (
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84 int
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85 WORD_SYNTAX_P (Lisp_Object table, Emchar c)
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86 )
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428
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87 {
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88 return SYNTAX (table, c) == Sword;
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89 }
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90
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91 /* OK, here's a graphic diagram of the format of the syntax values:
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92
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93 Bit number:
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94
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95 [ 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 ]
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96 [ 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 ]
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97
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98 <-----> <-----> <-------------> <-------------> ^ <----------->
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99 ELisp unused |comment bits | unused | syntax code
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100 tag | | | | | | | | |
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101 stuff | | | | | | | | |
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102 | | | | | | | | |
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103 | | | | | | | | `--> prefix flag
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104 | | | | | | | |
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105 | | | | | | | `--> comment end style B, second char
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106 | | | | | | `----> comment end style A, second char
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107 | | | | | `------> comment end style B, first char
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108 | | | | `--------> comment end style A, first char
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109 | | | `----------> comment start style B, second char
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110 | | `------------> comment start style A, second char
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111 | `--------------> comment start style B, first char
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112 `----------------> comment start style A, first char
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113
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114 In a 64-bit integer, there would be 32 more unused bits between
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115 the tag and the comment bits.
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116
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117 Clearly, such a scheme will not work for Mule, because the matching
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118 paren could be any character and as such requires 19 bits, which
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119 we don't got.
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120
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121 Remember that under Mule we use char tables instead of vectors.
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122 So what we do is use another char table for the matching paren
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123 and store a pointer to it in the first char table. (This frees
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124 code from having to worry about passing two tables around.)
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125 */
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126
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127
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128 /* The prefix flag bit for backward-prefix-chars is now put into bit 7. */
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129
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130 #define SYNTAX_PREFIX(table, c) \
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131 ((SYNTAX_CODE (table, c) >> 7) & 1)
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132
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133 /* Bits 23-16 are used to implement up to two comment styles
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134 in a single buffer. They have the following meanings:
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135
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136 1. first of a one or two character comment-start sequence of style a.
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137 2. first of a one or two character comment-start sequence of style b.
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138 3. second of a two-character comment-start sequence of style a.
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139 4. second of a two-character comment-start sequence of style b.
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140 5. first of a one or two character comment-end sequence of style a.
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141 6. first of a one or two character comment-end sequence of style b.
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142 7. second of a two-character comment-end sequence of style a.
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143 8. second of a two-character comment-end sequence of style b.
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144 */
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145
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146 #define SYNTAX_COMMENT_BITS(table, c) \
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147 ((SYNTAX_CODE (table, c) >> 16) &0xff)
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148
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149 #define SYNTAX_FIRST_OF_START_A 0x80
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150 #define SYNTAX_FIRST_OF_START_B 0x40
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151 #define SYNTAX_SECOND_OF_START_A 0x20
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152 #define SYNTAX_SECOND_OF_START_B 0x10
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153 #define SYNTAX_FIRST_OF_END_A 0x08
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154 #define SYNTAX_FIRST_OF_END_B 0x04
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155 #define SYNTAX_SECOND_OF_END_A 0x02
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156 #define SYNTAX_SECOND_OF_END_B 0x01
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157
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158 #define SYNTAX_COMMENT_STYLE_A 0xaa
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159 #define SYNTAX_COMMENT_STYLE_B 0x55
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160 #define SYNTAX_FIRST_CHAR_START 0xc0
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161 #define SYNTAX_FIRST_CHAR_END 0x0c
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162 #define SYNTAX_FIRST_CHAR 0xcc
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163 #define SYNTAX_SECOND_CHAR_START 0x30
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164 #define SYNTAX_SECOND_CHAR_END 0x03
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165 #define SYNTAX_SECOND_CHAR 0x33
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166
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826
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167 #if 0
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168
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169 /* #### Entirely unused. Should they be deleted? */
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428
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170
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442
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171 /* #### These are now more or less equivalent to
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172 SYNTAX_COMMENT_MATCH_START ...*/
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173 /* a and b must be first and second start chars for a common type */
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174 #define SYNTAX_START_P(table, a, b) \
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175 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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176 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START))
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177
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178 /* ... and SYNTAX_COMMENT_MATCH_END */
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179 /* a and b must be first and second end chars for a common type */
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180 #define SYNTAX_END_P(table, a, b) \
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181 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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182 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END))
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428
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183
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184 #define SYNTAX_STYLES_MATCH_START_P(table, a, b, mask) \
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185 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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186 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START & (mask)))
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187
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188 #define SYNTAX_STYLES_MATCH_END_P(table, a, b, mask) \
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189 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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190 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END & (mask)))
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191
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192 #define SYNTAX_STYLES_MATCH_1CHAR_P(table, a, mask) \
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193 ((SYNTAX_COMMENT_BITS (table, a) & (mask)))
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194
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195 #define STYLE_FOUND_P(table, a, b, startp, style) \
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196 ((SYNTAX_COMMENT_BITS (table, a) & \
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197 ((startp) ? SYNTAX_FIRST_CHAR_START : \
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198 SYNTAX_FIRST_CHAR_END) & (style)) \
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199 && (SYNTAX_COMMENT_BITS (table, b) & \
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200 ((startp) ? SYNTAX_SECOND_CHAR_START : \
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201 SYNTAX_SECOND_CHAR_END) & (style)))
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202
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203 #define SYNTAX_COMMENT_MASK_START(table, a, b) \
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204 ((STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_A) \
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205 ? SYNTAX_COMMENT_STYLE_A \
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206 : (STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_B) \
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207 ? SYNTAX_COMMENT_STYLE_B \
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208 : 0)))
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209
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210 #define SYNTAX_COMMENT_MASK_END(table, a, b) \
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211 ((STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_A) \
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212 ? SYNTAX_COMMENT_STYLE_A \
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213 : (STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_B) \
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214 ? SYNTAX_COMMENT_STYLE_B \
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215 : 0)))
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216
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217 #define STYLE_FOUND_1CHAR_P(table, a, style) \
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218 ((SYNTAX_COMMENT_BITS (table, a) & (style)))
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219
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220 #define SYNTAX_COMMENT_1CHAR_MASK(table, a) \
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221 ((STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_A) \
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222 ? SYNTAX_COMMENT_STYLE_A \
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223 : (STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_B) \
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224 ? SYNTAX_COMMENT_STYLE_B \
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225 : 0)))
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226
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826
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227 #endif /* 0 */
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428
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228
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229 /* This array, indexed by a character, contains the syntax code which
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230 that character signifies (as a char).
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231 For example, (enum syntaxcode) syntax_spec_code['w'] is Sword. */
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232
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442
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233 extern const unsigned char syntax_spec_code[0400];
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428
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234
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235 /* Indexed by syntax code, give the letter that describes it. */
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236
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442
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237 extern const unsigned char syntax_code_spec[];
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428
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238
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665
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239 Lisp_Object scan_lists (struct buffer *buf, Charbpos from, int count,
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428
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240 int depth, int sexpflag, int no_error);
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665
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241 int char_quoted (struct buffer *buf, Charbpos pos);
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428
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242
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243 /* NOTE: This does not refer to the mirror table, but to the
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244 syntax table itself. */
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245 Lisp_Object syntax_match (Lisp_Object table, Emchar ch);
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246
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247 extern int no_quit_in_re_search;
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826
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248
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249 void update_syntax_table (Lisp_Object table);
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460
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250
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826
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251
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252 /****************************** syntax caches ********************************/
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460
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253
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254 extern int lookup_syntax_properties;
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255
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826
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256 /* Now that the `syntax-table' property exists, and can override the syntax
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257 table or directly specify the syntax, we cache the last place we
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258 retrieved the syntax-table property. This is because, when moving
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259 linearly through text (e.g. in the regex routines or the scanning
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260 routines in syntax.c), we only need to recalculate at the next place the
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261 syntax-table property changes (i.e. not every position), and when we do
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262 need to recalculate, we can update the info from the previous info
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263 faster than if we did the whole calculation from scratch. */
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460
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264 struct syntax_cache
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265 {
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826
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266 int use_code; /* Whether to use syntax_code or
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267 current_syntax_table. This is
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268 set depending on whether the
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269 syntax-table property is a
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270 syntax table or a syntax
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271 code. */
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272 int no_syntax_table_prop; /* If non-zero, there was no
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273 `syntax-table' property on the
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274 current range, and so we're
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275 using the buffer's syntax table.
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276 This is important to note because
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277 sometimes the buffer's syntax
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278 table can be changed. */
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460
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279 Lisp_Object object; /* The buffer or string the current
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826
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280 syntax cache applies to, or
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281 Qnil for a string of text not
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282 coming from a buffer or string. */
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283 struct buffer *buffer; /* The buffer that supplies the
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284 syntax tables, or 0 for the
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285 standard syntax table. If
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286 OBJECT is a buffer, this will
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287 always be the same buffer. */
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460
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288 int syntax_code; /* Syntax code of current char. */
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289 Lisp_Object current_syntax_table; /* Syntax table for current pos. */
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826
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290 Lisp_Object start, end; /* Markers to keep track of the
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291 known region in a buffer.
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292 Formerly we used an internal
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293 extent, but it seems that having
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294 an extent over the entire buffer
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295 causes serious slowdowns in
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296 extent operations! Yuck! */
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297 Charxpos next_change; /* Position of the next extent
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460
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298 change. */
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826
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299 Charxpos prev_change; /* Position of the previous extent
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300 change. */
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460
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301 };
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826
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302
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303 /* Note that the external interface to the syntax-cache uses charpos's, but
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304 intnernally we use bytepos's, for speed. */
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460
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305
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826
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306 void update_syntax_cache (struct syntax_cache *cache, Charxpos pos, int count);
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307 struct syntax_cache *setup_syntax_cache (struct syntax_cache *cache,
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308 Lisp_Object object,
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309 struct buffer *buffer,
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310 Charxpos from, int count);
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311 struct syntax_cache *setup_buffer_syntax_cache (struct buffer *buffer,
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312 Charxpos from, int count);
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460
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313
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314 /* Make syntax cache state good for CHARPOS, assuming it is
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315 currently good for a position before CHARPOS. */
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826
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316 DECLARE_INLINE_HEADER (
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317 void
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318 UPDATE_SYNTAX_CACHE_FORWARD (struct syntax_cache *cache, Charxpos pos)
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319 )
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320 {
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321 if (!(pos >= cache->prev_change && pos < cache->next_change))
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322 update_syntax_cache (cache, pos, 1);
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323 }
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460
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324
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325 /* Make syntax cache state good for CHARPOS, assuming it is
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326 currently good for a position after CHARPOS. */
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826
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327 DECLARE_INLINE_HEADER (
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328 void
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329 UPDATE_SYNTAX_CACHE_BACKWARD (struct syntax_cache *cache, Charxpos pos)
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330 )
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331 {
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332 if (!(pos >= cache->prev_change && pos < cache->next_change))
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333 update_syntax_cache (cache, pos, -1);
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334 }
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460
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335
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336 /* Make syntax cache state good for CHARPOS */
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826
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337 DECLARE_INLINE_HEADER (
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338 void
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339 UPDATE_SYNTAX_CACHE (struct syntax_cache *cache, Charxpos pos)
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340 )
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341 {
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342 if (!(pos >= cache->prev_change && pos < cache->next_change))
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343 update_syntax_cache (cache, pos, 0);
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344 }
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460
|
345
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826
|
346 #define SYNTAX_FROM_CACHE(cache, c) \
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347 SYNTAX_FROM_CODE (SYNTAX_CODE_FROM_CACHE (cache, c))
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460
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348
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826
|
349 #define SYNTAX_CODE_FROM_CACHE(cache, c) \
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350 ((cache)->use_code ? (cache)->syntax_code \
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351 : SYNTAX_CODE ((cache)->current_syntax_table, c))
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352
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353
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354 /***************************** syntax code macros ****************************/
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|
460
|
355
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356 #define SYNTAX_CODE_PREFIX(c) \
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357 ((c >> 7) & 1)
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358
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359 #define SYNTAX_CODE_COMMENT_BITS(c) \
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360 ((c >> 16) &0xff)
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361
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362 #define SYNTAX_CODES_START_P(a, b) \
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363 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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364 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_START))
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365
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366 #define SYNTAX_CODES_END_P(a, b) \
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367 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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368 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END))
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369
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370 #define SYNTAX_CODES_COMMENT_MASK_START(a, b) \
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371 (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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372 ? SYNTAX_COMMENT_STYLE_A \
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373 : (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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374 ? SYNTAX_COMMENT_STYLE_B \
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375 : 0))
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376 #define SYNTAX_CODES_COMMENT_MASK_END(a, b) \
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377 (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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378 ? SYNTAX_COMMENT_STYLE_A \
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379 : (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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380 ? SYNTAX_COMMENT_STYLE_B \
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381 : 0))
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382
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383 #define SYNTAX_CODE_START_FIRST_P(a) \
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384 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START)
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385
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386 #define SYNTAX_CODE_START_SECOND_P(a) \
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387 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_START)
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388
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389 #define SYNTAX_CODE_END_FIRST_P(a) \
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390 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END)
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391
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392 #define SYNTAX_CODE_END_SECOND_P(a) \
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393 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_END)
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394
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395
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396 #define SYNTAX_CODES_MATCH_START_P(a, b, mask) \
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397 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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398 && (SYNTAX_CODE_COMMENT_BITS (b) \
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399 & SYNTAX_SECOND_CHAR_START & (mask)))
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400
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401 #define SYNTAX_CODES_MATCH_END_P(a, b, mask) \
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402 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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403 && (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END & (mask)))
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404
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405 #define SYNTAX_CODE_MATCHES_1CHAR_P(a, mask) \
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406 ((SYNTAX_CODE_COMMENT_BITS (a) & (mask)))
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407
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408 #define SYNTAX_CODE_COMMENT_1CHAR_MASK(a) \
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409 ((SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_A) \
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410 ? SYNTAX_COMMENT_STYLE_A \
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411 : (SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_B) \
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412 ? SYNTAX_COMMENT_STYLE_B \
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413 : 0)))
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414
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415
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440
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416 #endif /* INCLUDED_syntax_h_ */
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