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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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23 #ifndef _XEMACS_SYNTAX_H_
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24 #define _XEMACS_SYNTAX_H_
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25
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26 /* The standard syntax table is stored where it will automatically
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27 be used in all new buffers. */
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28 extern Lisp_Object Vstandard_syntax_table;
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29
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30 /* A syntax table is a Lisp vector of length 0400, whose elements are integers.
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31
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32 The low 7 bits of the integer is a code, as follows. The 8th bit is
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33 used as the prefix bit flag (see below).
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34 */
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35
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36 enum syntaxcode
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2
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37 {
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38 Swhitespace, /* whitespace character */
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39 Spunct, /* random punctuation character */
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40 Sword, /* word constituent */
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41 Ssymbol, /* symbol constituent but not word constituent */
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42 Sopen, /* a beginning delimiter */
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43 Sclose, /* an ending delimiter */
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44 Squote, /* a prefix character like Lisp ' */
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45 Sstring, /* a string-grouping character like Lisp " */
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46 Smath, /* delimiters like $ in TeX. */
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47 Sescape, /* a character that begins a C-style escape */
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48 Scharquote, /* a character that quotes the following character */
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49 Scomment, /* a comment-starting character */
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50 Sendcomment, /* a comment-ending character */
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51 Sinherit, /* use the standard syntax table for this character */
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52 Sextword, /* extended word; works mostly like a word constituent.
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53 See the comment in syntax.c. */
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54 Smax /* Upper bound on codes that are meaningful */
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55 };
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0
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56
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57 extern Lisp_Object Qsyntax_table_p;
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58 Lisp_Object Fsyntax_table_p (Lisp_Object);
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59 Lisp_Object Fsyntax_table (Lisp_Object);
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60 Lisp_Object Fset_syntax_table (Lisp_Object, Lisp_Object);
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61
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62 /* Return the raw syntax code for a particular character and table */
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63 #define RAW_SYNTAX_CODE_UNSAFE(table, c) \
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64 (XINT (vector_data (XVECTOR (table))[(unsigned char) (c)]))
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65
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66 /* Return the syntax code for a particular character and table, taking
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67 into account inheritance. */
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68
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69 /* Unfortunately, we cannot write SYNTAX_CODE() as a safe macro in
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70 general. I tried just using an inline function but that causes
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71 significant slowdown (esp. in regex routines) because this macro
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72 is called so many millions of times. So instead we resort to
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73 SYNTAX_CODE_UNSAFE(), which is used most of the time. Under
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74 GCC we can actually write this as a safe macro, and we do because
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75 it's likely to lead to speedups. */
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76
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77 #ifdef __GNUC__
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78 #define SYNTAX_CODE_UNSAFE(table, c) \
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79 ({ Emchar _ch_ = (c); \
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80 int _rawcode_ = RAW_SYNTAX_CODE_UNSAFE (table, _ch_); \
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81 if ((enum syntaxcode) (_rawcode_ & 0177) == Sinherit) \
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82 _rawcode_ = RAW_SYNTAX_CODE_UNSAFE (Vstandard_syntax_table, _ch_); \
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83 _rawcode_; })
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84 #else
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85 #define SYNTAX_CODE_UNSAFE(table, c) \
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86 (RAW_SYNTAX_CODE_UNSAFE (table, c) == Sinherit \
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87 ? RAW_SYNTAX_CODE_UNSAFE (Vstandard_syntax_table, c) \
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88 : RAW_SYNTAX_CODE_UNSAFE (table, c))
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89 #endif
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90
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91 INLINE int SYNTAX_CODE (Lisp_Object table, Emchar c);
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92 INLINE int
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93 SYNTAX_CODE (Lisp_Object table, Emchar c)
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94 {
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95 return SYNTAX_CODE_UNSAFE (table, c);
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96 }
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97
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98 #define SYNTAX_UNSAFE(table, c) \
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99 ((enum syntaxcode) (SYNTAX_CODE_UNSAFE (table, c) & 0177))
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100
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101 #define SYNTAX_FROM_CODE(code) ((enum syntaxcode) ((code) & 0177))
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102 #define SYNTAX(table, c) SYNTAX_FROM_CODE (SYNTAX_CODE (table, c))
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103
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104 INLINE int WORD_SYNTAX_P (Lisp_Object table, Emchar c);
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105 INLINE int
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106 WORD_SYNTAX_P (Lisp_Object table, Emchar c)
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107 {
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108 int syncode = SYNTAX (table, c);
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109 return syncode == Sword || syncode == Sextword;
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110 }
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111
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112 /* The prefix flag bit for backward-prefix-chars is now put into bit 7. */
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113
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114 #define SYNTAX_PREFIX_UNSAFE(table, c) \
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115 ((SYNTAX_CODE_UNSAFE (table, c) >> 7) & 1)
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116 #define SYNTAX_PREFIX(table, c) \
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117 ((SYNTAX_CODE (table, c) >> 7) & 1)
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118
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119 /* The next 8 bits of the number is a character,
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120 the matching delimiter in the case of Sopen or Sclose. */
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121
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122 #define SYNTAX_MATCH(table, c) \
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123 ((SYNTAX_CODE (table, c) >> 8) & 0377)
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124
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125 /* The next 8 bits are used to implement up to two comment styles
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126 in a single buffer. They have the following meanings:
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127
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128 1. first of a one or two character comment-start sequence of style a.
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129 2. first of a one or two character comment-start sequence of style b.
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130 3. second of a two-character comment-start sequence of style a.
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131 4. second of a two-character comment-start sequence of style b.
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132 5. first of a one or two character comment-end sequence of style a.
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133 6. first of a one or two character comment-end sequence of style b.
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134 7. second of a two-character comment-end sequence of style a.
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135 8. second of a two-character comment-end sequence of style b.
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136 */
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137
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138 #define SYNTAX_COMMENT_BITS(table, c) \
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139 ((SYNTAX_CODE (table, c) >> 16) &0xff)
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140
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141 #define SYNTAX_FIRST_OF_START_A 0x80
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142 #define SYNTAX_FIRST_OF_START_B 0x40
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143 #define SYNTAX_SECOND_OF_START_A 0x20
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144 #define SYNTAX_SECOND_OF_START_B 0x10
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145 #define SYNTAX_FIRST_OF_END_A 0x08
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146 #define SYNTAX_FIRST_OF_END_B 0x04
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147 #define SYNTAX_SECOND_OF_END_A 0x02
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148 #define SYNTAX_SECOND_OF_END_B 0x01
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149
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150 #define SYNTAX_COMMENT_STYLE_A 0xaa
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151 #define SYNTAX_COMMENT_STYLE_B 0x55
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152 #define SYNTAX_FIRST_CHAR_START 0xc0
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153 #define SYNTAX_FIRST_CHAR_END 0x0c
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154 #define SYNTAX_FIRST_CHAR 0xcc
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155 #define SYNTAX_SECOND_CHAR_START 0x30
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156 #define SYNTAX_SECOND_CHAR_END 0x03
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157 #define SYNTAX_SECOND_CHAR 0x33
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158
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159 #define SYNTAX_START_P(table, a, b) \
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160 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START) \
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161 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START))
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162
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163 #define SYNTAX_END_P(table, a, b) \
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164 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END) \
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165 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END))
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166
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167 #define SYNTAX_STYLES_MATCH_START_P(table, a, b, mask) \
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168 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_START & (mask)) \
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169 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_START & (mask)))
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170
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171 #define SYNTAX_STYLES_MATCH_END_P(table, a, b, mask) \
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172 ((SYNTAX_COMMENT_BITS (table, a) & SYNTAX_FIRST_CHAR_END & (mask)) \
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173 && (SYNTAX_COMMENT_BITS (table, b) & SYNTAX_SECOND_CHAR_END & (mask)))
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174
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175 #define SYNTAX_STYLES_MATCH_1CHAR_P(table, a, mask) \
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176 ((SYNTAX_COMMENT_BITS (table, a) & (mask)))
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177
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178 #define STYLE_FOUND_P(table, a, b, startp, style) \
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179 ((SYNTAX_COMMENT_BITS (table, a) & \
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180 ((startp) ? SYNTAX_FIRST_CHAR_START : \
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181 SYNTAX_FIRST_CHAR_END) & (style)) \
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182 && (SYNTAX_COMMENT_BITS (table, b) & \
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183 ((startp) ? SYNTAX_SECOND_CHAR_START : \
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184 SYNTAX_SECOND_CHAR_END) & (style)))
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185
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186 #define SYNTAX_COMMENT_MASK_START(table, a, b) \
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187 ((STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_A) \
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188 ? SYNTAX_COMMENT_STYLE_A \
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189 : (STYLE_FOUND_P (table, a, b, 1, SYNTAX_COMMENT_STYLE_B) \
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190 ? SYNTAX_COMMENT_STYLE_B \
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191 : 0)))
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192
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193 #define SYNTAX_COMMENT_MASK_END(table, a, b) \
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194 ((STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_A) \
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195 ? SYNTAX_COMMENT_STYLE_A \
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196 : (STYLE_FOUND_P (table, a, b, 0, SYNTAX_COMMENT_STYLE_B) \
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197 ? SYNTAX_COMMENT_STYLE_B \
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198 : 0)))
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199
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200 #define STYLE_FOUND_1CHAR_P(table, a, style) \
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201 ((SYNTAX_COMMENT_BITS (table, a) & (style)))
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202
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203 #define SYNTAX_COMMENT_1CHAR_MASK(table, a) \
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204 ((STYLE_FOUND_1CHAR_P (table, a, SYNTAX_COMMENT_STYLE_A) \
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205 ? SYNTAX_COMMENT_STYLE_A \
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206 : (STYLE_FOUND_1CHAR_P (table, a, 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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2
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210 /* This array, indexed by a character, contains the syntax code which
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211 that character signifies (as a char).
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212 For example, (enum syntaxcode) syntax_spec_code['w'] is Sword. */
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213
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214 extern CONST unsigned char syntax_spec_code[0400];
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215
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216 /* Indexed by syntax code, give the letter that describes it. */
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217
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218 extern CONST unsigned char syntax_code_spec[];
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219
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220 Lisp_Object scan_lists (struct buffer *buf, int from, int count,
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221 int depth, int sexpflag, int no_error);
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222 int char_quoted (struct buffer *buf, int pos);
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223
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224 /* NOTE: This does not refer to the mirror table, but to the
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225 syntax table itself. */
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226 Lisp_Object syntax_match (Lisp_Object table, Emchar ch);
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227
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228 extern int no_quit_in_re_search;
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229 extern struct buffer *regex_emacs_buffer;
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230
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231 #endif /* _XEMACS_SYNTAX_H_ */
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