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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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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: FSF 19.28. */
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22
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440
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23 #ifndef INCLUDED_syntax_h_
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24 #define INCLUDED_syntax_h_
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428
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25
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26 #include "chartab.h"
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27
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28 /* A syntax table is a type of char table.
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29
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30 The low 7 bits of the integer is a code, as follows. The 8th bit is
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31 used as the prefix bit flag (see below).
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32
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33 The values in a syntax table are either integers or conses of
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34 integers and chars. The lowest 7 bits of the integer are the syntax
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35 class. If this is Sinherit, then the actual syntax value needs to
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36 be retrieved from the standard syntax table.
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37
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38 Since the logic involved in finding the actual integer isn't very
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39 complex, you'd think the time required to retrieve it is not a
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40 factor. If you thought that, however, you'd be wrong, due to the
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41 high number of times (many per character) that the syntax value is
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42 accessed in functions such as scan_lists(). To speed this up,
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43 we maintain a mirror syntax table that contains the actual
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44 integers. We can do this successfully because syntax tables are
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45 now an abstract type, where we control all access.
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46 */
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47
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48 enum syntaxcode
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49 {
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50 Swhitespace, /* whitespace character */
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51 Spunct, /* random punctuation character */
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52 Sword, /* word constituent */
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53 Ssymbol, /* symbol constituent but not word constituent */
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54 Sopen, /* a beginning delimiter */
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55 Sclose, /* an ending delimiter */
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56 Squote, /* a prefix character like Lisp ' */
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57 Sstring, /* a string-grouping character like Lisp " */
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58 Smath, /* delimiters like $ in TeX. */
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59 Sescape, /* a character that begins a C-style escape */
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60 Scharquote, /* a character that quotes the following character */
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61 Scomment, /* a comment-starting character */
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62 Sendcomment, /* a comment-ending character */
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63 Sinherit, /* use the standard syntax table for this character */
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460
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64 Scomment_fence, /* Starts/ends comment which is delimited on the
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65 other side by a char with the same syntaxcode. */
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66 Sstring_fence, /* Starts/ends string which is delimited on the
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67 other side by a char with the same syntaxcode. */
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428
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68 Smax /* Upper bound on codes that are meaningful */
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69 };
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70
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71 enum syntaxcode charset_syntax (struct buffer *buf, Lisp_Object charset,
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72 int *multi_p_out);
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73
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74 /* Return the syntax code for a particular character and mirror table. */
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75
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76 #define SYNTAX_CODE_UNSAFE(table, c) \
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77 XINT (CHAR_TABLE_VALUE_UNSAFE (table, c))
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78
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442
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79 INLINE_HEADER int SYNTAX_CODE (Lisp_Char_Table *table, Emchar c);
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80 INLINE_HEADER int
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440
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81 SYNTAX_CODE (Lisp_Char_Table *table, Emchar c)
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428
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82 {
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83 return SYNTAX_CODE_UNSAFE (table, c);
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84 }
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85
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86 #define SYNTAX_UNSAFE(table, c) \
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87 ((enum syntaxcode) (SYNTAX_CODE_UNSAFE (table, c) & 0177))
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88
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89 #define SYNTAX_FROM_CODE(code) ((enum syntaxcode) ((code) & 0177))
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90 #define SYNTAX(table, c) SYNTAX_FROM_CODE (SYNTAX_CODE (table, c))
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91
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442
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92 INLINE_HEADER int WORD_SYNTAX_P (Lisp_Char_Table *table, Emchar c);
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93 INLINE_HEADER int
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440
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94 WORD_SYNTAX_P (Lisp_Char_Table *table, Emchar c)
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428
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95 {
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96 return SYNTAX (table, c) == Sword;
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97 }
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98
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99 /* OK, here's a graphic diagram of the format of the syntax values:
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100
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101 Bit number:
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102
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103 [ 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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104 [ 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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105
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106 <-----> <-----> <-------------> <-------------> ^ <----------->
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107 ELisp unused |comment bits | unused | syntax code
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108 tag | | | | | | | | |
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109 stuff | | | | | | | | |
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110 | | | | | | | | |
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111 | | | | | | | | `--> prefix flag
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112 | | | | | | | |
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113 | | | | | | | `--> comment end style B, second char
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114 | | | | | | `----> comment end style A, second char
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115 | | | | | `------> comment end style B, first char
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116 | | | | `--------> comment end style A, first char
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117 | | | `----------> comment start style B, second char
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118 | | `------------> comment start style A, second char
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119 | `--------------> comment start style B, first char
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120 `----------------> comment start style A, first char
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121
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122 In a 64-bit integer, there would be 32 more unused bits between
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123 the tag and the comment bits.
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124
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125 Clearly, such a scheme will not work for Mule, because the matching
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126 paren could be any character and as such requires 19 bits, which
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127 we don't got.
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128
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129 Remember that under Mule we use char tables instead of vectors.
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130 So what we do is use another char table for the matching paren
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131 and store a pointer to it in the first char table. (This frees
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132 code from having to worry about passing two tables around.)
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133 */
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134
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135
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136 /* The prefix flag bit for backward-prefix-chars is now put into bit 7. */
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137
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138 #define SYNTAX_PREFIX_UNSAFE(table, c) \
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139 ((SYNTAX_CODE_UNSAFE (table, c) >> 7) & 1)
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140 #define SYNTAX_PREFIX(table, c) \
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141 ((SYNTAX_CODE (table, c) >> 7) & 1)
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142
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143 /* Bits 23-16 are used to implement up to two comment styles
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144 in a single buffer. They have the following meanings:
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145
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146 1. first of a one or two character comment-start sequence of style a.
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147 2. first of a one or two character comment-start sequence of style b.
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148 3. second of a two-character comment-start sequence of style a.
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149 4. second of a two-character comment-start sequence of style b.
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150 5. first of a one or two character comment-end sequence of style a.
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151 6. first of a one or two character comment-end sequence of style b.
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152 7. second of a two-character comment-end sequence of style a.
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153 8. second of a two-character comment-end sequence of style b.
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154 */
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155
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156 #define SYNTAX_COMMENT_BITS(table, c) \
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157 ((SYNTAX_CODE (table, c) >> 16) &0xff)
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158
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159 #define SYNTAX_FIRST_OF_START_A 0x80
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160 #define SYNTAX_FIRST_OF_START_B 0x40
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161 #define SYNTAX_SECOND_OF_START_A 0x20
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162 #define SYNTAX_SECOND_OF_START_B 0x10
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163 #define SYNTAX_FIRST_OF_END_A 0x08
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164 #define SYNTAX_FIRST_OF_END_B 0x04
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165 #define SYNTAX_SECOND_OF_END_A 0x02
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166 #define SYNTAX_SECOND_OF_END_B 0x01
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167
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168 #define SYNTAX_COMMENT_STYLE_A 0xaa
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169 #define SYNTAX_COMMENT_STYLE_B 0x55
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170 #define SYNTAX_FIRST_CHAR_START 0xc0
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171 #define SYNTAX_FIRST_CHAR_END 0x0c
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172 #define SYNTAX_FIRST_CHAR 0xcc
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173 #define SYNTAX_SECOND_CHAR_START 0x30
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174 #define SYNTAX_SECOND_CHAR_END 0x03
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175 #define SYNTAX_SECOND_CHAR 0x33
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176
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177
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442
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178 /* #### These are now more or less equivalent to
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179 SYNTAX_COMMENT_MATCH_START ...*/
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180 /* a and b must be first and second start chars for a common type */
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181 #define SYNTAX_START_P(table, a, b) \
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182 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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183 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START))
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184
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185 /* ... and SYNTAX_COMMENT_MATCH_END */
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186 /* a and b must be first and second end chars for a common type */
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187 #define SYNTAX_END_P(table, a, b) \
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188 (((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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189 & (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END))
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428
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190
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191 #define SYNTAX_STYLES_MATCH_START_P(table, a, b, mask) \
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192 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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193 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START & (mask)))
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194
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195 #define SYNTAX_STYLES_MATCH_END_P(table, a, b, mask) \
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196 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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197 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END & (mask)))
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198
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199 #define SYNTAX_STYLES_MATCH_1CHAR_P(table, a, mask) \
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200 ((SYNTAX_COMMENT_BITS (table, a) & (mask)))
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201
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202 #define STYLE_FOUND_P(table, a, b, startp, style) \
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203 ((SYNTAX_COMMENT_BITS (table, a) & \
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204 ((startp) ? SYNTAX_FIRST_CHAR_START : \
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205 SYNTAX_FIRST_CHAR_END) & (style)) \
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206 && (SYNTAX_COMMENT_BITS (table, b) & \
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207 ((startp) ? SYNTAX_SECOND_CHAR_START : \
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208 SYNTAX_SECOND_CHAR_END) & (style)))
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209
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210 #define SYNTAX_COMMENT_MASK_START(table, a, b) \
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211 ((STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_A) \
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212 ? SYNTAX_COMMENT_STYLE_A \
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213 : (STYLE_FOUND_P (table, a, b, 1, 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 SYNTAX_COMMENT_MASK_END(table, a, b) \
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218 ((STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_A) \
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219 ? SYNTAX_COMMENT_STYLE_A \
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220 : (STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_B) \
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221 ? SYNTAX_COMMENT_STYLE_B \
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222 : 0)))
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223
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224 #define STYLE_FOUND_1CHAR_P(table, a, style) \
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225 ((SYNTAX_COMMENT_BITS (table, a) & (style)))
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226
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227 #define SYNTAX_COMMENT_1CHAR_MASK(table, a) \
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228 ((STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_A) \
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229 ? SYNTAX_COMMENT_STYLE_A \
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230 : (STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_B) \
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231 ? SYNTAX_COMMENT_STYLE_B \
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232 : 0)))
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233
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234 EXFUN (Fchar_syntax, 2);
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235 EXFUN (Fforward_word, 2);
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236
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237 /* The standard syntax table is stored where it will automatically
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238 be used in all new buffers. */
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239 extern Lisp_Object Vstandard_syntax_table;
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240
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241 /* This array, indexed by a character, contains the syntax code which
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242 that character signifies (as a char).
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243 For example, (enum syntaxcode) syntax_spec_code['w'] is Sword. */
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244
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442
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245 extern const unsigned char syntax_spec_code[0400];
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428
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246
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247 /* Indexed by syntax code, give the letter that describes it. */
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248
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442
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249 extern const unsigned char syntax_code_spec[];
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428
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250
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251 Lisp_Object scan_lists (struct buffer *buf, Bufpos from, int count,
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252 int depth, int sexpflag, int no_error);
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253 int char_quoted (struct buffer *buf, Bufpos pos);
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254
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255 /* NOTE: This does not refer to the mirror table, but to the
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256 syntax table itself. */
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257 Lisp_Object syntax_match (Lisp_Object table, Emchar ch);
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258
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259 extern int no_quit_in_re_search;
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260 extern struct buffer *regex_emacs_buffer;
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460
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261
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262 /* This is the string or buffer in which we are matching. It is used
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263 for looking up syntax properties. */
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264 extern Lisp_Object regex_match_object;
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428
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265
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440
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266 void update_syntax_table (Lisp_Char_Table *ct);
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428
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267
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460
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268 #ifdef emacs
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269
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270 extern int lookup_syntax_properties;
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271
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272 struct syntax_cache
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273 {
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274 int use_code; /* Whether to use syntax_code
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275 or current_syntax_table. */
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276 struct buffer* buffer; /* The buffer the current syntax cache
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277 applies to. */
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278 Lisp_Object object; /* The buffer or string the current
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279 syntax cache applies to. */
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280 int syntax_code; /* Syntax code of current char. */
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281 Lisp_Object current_syntax_table; /* Syntax table for current pos. */
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282 Lisp_Object old_prop; /* Syntax-table prop at prev pos. */
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283
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284 Bufpos next_change; /* Position of the next extent
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285 change. */
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286 Bufpos prev_change; /* Position of the previous
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287 extent change. */
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288 };
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289 extern struct syntax_cache syntax_cache;
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290
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291 void update_syntax_cache (int pos, int count, int init);
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292
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293 /* Make syntax cache state good for CHARPOS, assuming it is
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294 currently good for a position before CHARPOS. */
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295 #define UPDATE_SYNTAX_CACHE_FORWARD(pos) \
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296 (lookup_syntax_properties \
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297 ? (update_syntax_cache ((pos), 1, 0), 1) \
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298 : 0)
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299
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300 /* Make syntax cache state good for CHARPOS, assuming it is
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301 currently good for a position after CHARPOS. */
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302 #define UPDATE_SYNTAX_CACHE_BACKWARD(pos) \
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303 (lookup_syntax_properties \
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304 ? (update_syntax_cache ((pos), -1, 0), 1) \
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305 : 0)
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306
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307 /* Make syntax cache state good for CHARPOS */
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308 #define UPDATE_SYNTAX_CACHE(pos) \
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309 (lookup_syntax_properties \
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310 ? (update_syntax_cache ((pos), 0, 0), 1) \
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311 : 0)
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312
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313 #define SYNTAX_FROM_CACHE(table, c) \
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314 SYNTAX_FROM_CODE (SYNTAX_CODE_FROM_CACHE (table, c))
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315
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316 #define SYNTAX_CODE_FROM_CACHE(table, c) \
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317 ( syntax_cache.use_code \
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318 ? syntax_cache.syntax_code \
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319 : SYNTAX_CODE (XCHAR_TABLE (syntax_cache.current_syntax_table), \
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320 c) \
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321 )
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322
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323 /* Convert the byte offset BYTEPOS into a character position,
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324 for the object recorded in syntax_cache with SETUP_SYNTAX_TABLE_FOR_OBJECT.
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325
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326 The value is meant for use in the UPDATE_SYNTAX_TABLE... macros.
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327 These macros do nothing when parse_sexp_lookup_properties is 0,
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328 so we return 0 in that case, for speed. */
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329 #define SYNTAX_CACHE_BYTE_TO_CHAR(bytepos) \
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330 (! lookup_syntax_properties \
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331 ? 0 \
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332 : STRINGP (syntax_cache.object) \
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333 ? bytecount_to_charcount (XSTRING_DATA (syntax_cache.object), bytepos) \
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334 : (BUFFERP (syntax_cache.object) || NILP (syntax_cache.object)) \
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335 ? bytind_to_bufpos (syntax_cache.buffer, \
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336 bytepos + BI_BUF_BEGV (syntax_cache.buffer)) \
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337 : (bytepos))
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338
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339 #define SYNTAX_CACHE_OBJECT_BYTE_TO_CHAR(obj, buf, bytepos) \
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340 (! lookup_syntax_properties \
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341 ? 0 \
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342 : STRINGP (obj) \
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343 ? bytecount_to_charcount (XSTRING_DATA (obj), bytepos) \
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344 : (BUFFERP (obj) || NILP (obj)) \
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345 ? bytind_to_bufpos (buf, bytepos + BI_BUF_BEGV (buf)) \
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346 : (bytepos))
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347
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348 #else /* not emacs */
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349
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350 #define update_syntax_cache(pos, count, init)
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351 #define UPDATE_SYNTAX_CACHE_FORWARD(pos)
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352 #define UPDATE_SYNTAX_CACHE_BACKWARD(pos)
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353 #define UPDATE_SYNTAX_CACHE(pos)
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354 #define SYNTAX_FROM_CACHE SYNTAX
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355 #define SYNTAX_CODE_FROM_CACHE SYNTAX_CODE
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356
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357 #endif /* emacs */
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358
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359 #define SETUP_SYNTAX_CACHE(FROM, COUNT) \
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360 do { \
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361 syntax_cache.buffer = current_buffer; \
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362 syntax_cache.object = Qnil; \
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363 syntax_cache.current_syntax_table \
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364 = current_buffer->mirror_syntax_table; \
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365 syntax_cache.use_code = 0; \
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366 if (lookup_syntax_properties) \
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367 update_syntax_cache ((COUNT) > 0 ? (FROM) : (FROM) - 1, \
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368 (COUNT), 1); \
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369 } while (0)
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370
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371 #define SETUP_SYNTAX_CACHE_FOR_BUFFER(BUFFER, FROM, COUNT) \
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372 do { \
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373 syntax_cache.buffer = (BUFFER); \
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374 syntax_cache.object = Qnil; \
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375 syntax_cache.current_syntax_table = \
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376 syntax_cache.buffer->mirror_syntax_table; \
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377 syntax_cache.use_code = 0; \
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378 if (lookup_syntax_properties) \
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379 update_syntax_cache ((FROM) + ((COUNT) > 0 ? 0 : -1), \
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380 (COUNT), 1); \
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381 } while (0)
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382
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383 #define SETUP_SYNTAX_CACHE_FOR_OBJECT(OBJECT, BUFFER, FROM, COUNT) \
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384 do { \
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385 syntax_cache.buffer = (BUFFER); \
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386 syntax_cache.object = (OBJECT); \
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387 if (NILP (syntax_cache.object)) \
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388 { \
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389 /* do nothing */; \
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390 } \
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391 else if (EQ (syntax_cache.object, Qt)) \
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392 { \
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393 /* do nothing */; \
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394 } \
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395 else if (STRINGP (syntax_cache.object)) \
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396 { \
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397 /* do nothing */; \
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398 } \
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399 else if (BUFFERP (syntax_cache.object)) \
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400 { \
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401 syntax_cache.buffer = XBUFFER (syntax_cache.object); \
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402 } \
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403 else \
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404 { \
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405 /* OBJECT must be buffer/string/t/nil */ \
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406 assert(0); \
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407 } \
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408 syntax_cache.current_syntax_table \
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409 = syntax_cache.buffer->mirror_syntax_table; \
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410 syntax_cache.use_code = 0; \
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411 if (lookup_syntax_properties) \
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412 update_syntax_cache ((FROM) + ((COUNT) > 0 ? 0 : -1), \
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413 (COUNT), 1); \
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414 } while (0)
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415
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416 #define SYNTAX_CODE_PREFIX(c) \
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417 ((c >> 7) & 1)
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418
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419 #define SYNTAX_CODE_COMMENT_BITS(c) \
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420 ((c >> 16) &0xff)
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421
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422 #define SYNTAX_CODES_START_P(a, b) \
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423 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START) >> 2) \
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424 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_START))
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425
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426 #define SYNTAX_CODES_END_P(a, b) \
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427 (((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END) >> 2) \
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428 & (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END))
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429
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430 #define SYNTAX_CODES_COMMENT_MASK_START(a, b) \
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431 (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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432 ? SYNTAX_COMMENT_STYLE_A \
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433 : (SYNTAX_CODES_MATCH_START_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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434 ? SYNTAX_COMMENT_STYLE_B \
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435 : 0))
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436 #define SYNTAX_CODES_COMMENT_MASK_END(a, b) \
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437 (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_A) \
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438 ? SYNTAX_COMMENT_STYLE_A \
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439 : (SYNTAX_CODES_MATCH_END_P (a, b, SYNTAX_COMMENT_STYLE_B) \
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440 ? SYNTAX_COMMENT_STYLE_B \
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441 : 0))
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442
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443 #define SYNTAX_CODE_START_FIRST_P(a) \
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444 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START)
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445
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446 #define SYNTAX_CODE_START_SECOND_P(a) \
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447 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_START)
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448
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449 #define SYNTAX_CODE_END_FIRST_P(a) \
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450 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END)
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451
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452 #define SYNTAX_CODE_END_SECOND_P(a) \
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453 (SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_SECOND_CHAR_END)
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454
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455
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456 #define SYNTAX_CODES_MATCH_START_P(a, b, mask) \
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457 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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458 && (SYNTAX_CODE_COMMENT_BITS (b) \
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459 & SYNTAX_SECOND_CHAR_START & (mask)))
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460
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461 #define SYNTAX_CODES_MATCH_END_P(a, b, mask) \
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462 ((SYNTAX_CODE_COMMENT_BITS (a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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463 && (SYNTAX_CODE_COMMENT_BITS (b) & SYNTAX_SECOND_CHAR_END & (mask)))
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464
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465 #define SYNTAX_CODE_MATCHES_1CHAR_P(a, mask) \
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466 ((SYNTAX_CODE_COMMENT_BITS (a) & (mask)))
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467
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468 #define SYNTAX_CODE_COMMENT_1CHAR_MASK(a) \
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469 ((SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_A) \
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470 ? SYNTAX_COMMENT_STYLE_A \
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471 : (SYNTAX_CODE_MATCHES_1CHAR_P (a, SYNTAX_COMMENT_STYLE_B) \
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472 ? SYNTAX_COMMENT_STYLE_B \
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473 : 0)))
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474
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475
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440
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476 #endif /* INCLUDED_syntax_h_ */
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