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0
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1 /* Routines to compute the current syntactic context, for font-lock mode.
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2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Sun Microsystems, Inc.
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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: Not in FSF. */
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23
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24 /* This code computes the syntactic context of the current point, that is,
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25 whether point is within a comment, a string, what have you. It does
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26 this by picking a point "known" to be outside of any syntactic constructs
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27 and moving forward, examining the syntax of each character.
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28
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29 Two caches are used: one caches the last point computed, and the other
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30 caches the last point at the beginning of a line. This makes there
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31 be little penalty for moving left-to-right on a line a character at a
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32 time; makes starting over on a line be cheap; and makes random-accessing
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33 within a line relatively cheap.
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34
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35 When we move to a different line farther down in the file (but within the
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36 current top-level form) we simply continue computing forward. If we move
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37 backward more than a line, or move beyond the end of the current tlf, or
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38 switch buffers, then we call `beginning-of-defun' and start over from
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39 there.
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40
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41 #### We should really rewrite this to keep extents over the buffer
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42 that hold the current syntactic information. This would be a big win.
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43 This way there would be no guessing or incorrect results.
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44 */
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45
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46 #include <config.h>
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47 #include "lisp.h"
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48
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49 #include "buffer.h"
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50 #include "insdel.h"
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51 #include "syntax.h"
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52
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53 Lisp_Object Qcomment;
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54 Lisp_Object Qblock_comment;
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55 Lisp_Object Qbeginning_of_defun;
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56
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57 enum syntactic_context
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58 {
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59 context_none,
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60 context_string,
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61 context_comment,
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62 context_block_comment
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63 };
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64
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65 enum block_comment_context
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66 {
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67 ccontext_none,
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68 ccontext_start1,
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69 ccontext_start2,
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70 ccontext_end1
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71 };
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72
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73 enum comment_style
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74 {
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75 comment_style_none,
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76 comment_style_a,
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77 comment_style_b
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78 };
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79
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80 struct context_cache
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81 {
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82 Bufpos start_point; /* beginning of defun */
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83 Bufpos cur_point; /* cache location */
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84 Bufpos end_point; /* end of defun */
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85 struct buffer *buffer; /* does this need to be staticpro'd? */
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86 enum syntactic_context context; /* single-char-syntax state */
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87 enum block_comment_context ccontext; /* block-comment state */
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88 enum comment_style style; /* which comment group */
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89 Emchar scontext; /* active string delimiter */
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90 int depth; /* depth in parens */
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91 int backslash_p; /* just read a backslash */
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92 int needs_its_head_reexamined; /* we're apparently outside of
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93 a top level form, and far away
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94 from it. This is a bad situation
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95 because it will lead to constant
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96 slowness as we keep going way
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97 back to that form and moving
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98 forward again. In this case,
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99 we try to compute a "pseudo-
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100 top-level-form" where the
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101 depth is 0 and the context
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102 is none at both ends. */
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103 };
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104
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105 /* We have two caches; one for the current point and one for
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106 the beginning of line. We used to rely on the caller to
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107 tell us when to invalidate them, but now we do it ourselves;
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108 it lets us be smarter. */
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109
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110 static struct context_cache context_cache;
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111
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112 static struct context_cache bol_context_cache;
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113
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114 int font_lock_debug;
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115
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116 #define reset_context_cache(cc) memset (cc, 0, sizeof (struct context_cache))
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117
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118 /* This function is called from signal_after_change() to tell us when
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119 textual changes are made so we can flush our caches when necessary.
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120
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121 We make the following somewhat heuristic assumptions:
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122
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123 (remember that current_point is always >= start_point, but may be
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124 less than or greater than end_point (we might not be inside any
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125 top-level form)).
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126
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127 1) Textual changes before the beginning of the current top-level form
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128 don't affect anything; all we need to do is offset the caches
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129 appropriately.
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130 2) Textual changes right at the beginning of the current
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131 top-level form messes things up and requires that we flush
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132 the caches.
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133 3) Textual changes after the beginning of the current top-level form
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134 and before one or both or the caches invalidates the corresponding
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135 cache(s).
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136 4) Textual changes after the caches and before the end of the
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137 current top-level form don't affect anything; all we need to do is
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138 offset the caches appropriately.
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139 5) Textual changes right at the end of the current top-level form
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140 necessitate recomputing that end value.
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141 6) Textual changes after the end of the current top-level form
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142 are ignored. */
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143
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144
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145 void
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146 font_lock_maybe_update_syntactic_caches (struct buffer *buf, Bufpos start,
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147 Bufpos orig_end, Bufpos new_end)
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148 {
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149 /* Note: either both context_cache and bol_context_cache are valid and
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150 point to the same buffer, or both are invalid. If we have to
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151 invalidate just context_cache, we recopy it from bol_context_cache.
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152 */
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153 if (context_cache.buffer != buf)
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154 /* caches don't apply */
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155 return;
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156 /* NOTE: The order of the if statements below is important. If you
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157 change them around unthinkingly, you will probably break something. */
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158 if (orig_end <= context_cache.start_point - 1)
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159 {
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160 /* case 1: before the beginning of the current top-level form */
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161 Charcount diff = new_end - orig_end;
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162 if (font_lock_debug)
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163 stderr_out ("font-lock; Case 1\n");
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164 context_cache.start_point += diff;
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165 context_cache.cur_point += diff;
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166 context_cache.end_point += diff;
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167 bol_context_cache.start_point += diff;
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168 bol_context_cache.cur_point += diff;
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169 bol_context_cache.end_point += diff;
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170 }
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171 else if (start <= context_cache.start_point)
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172 {
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173 if (font_lock_debug)
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174 stderr_out ("font-lock; Case 2\n");
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175 /* case 2: right at the current top-level form (paren that starts
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176 top level form got deleted or moved away from the newline it
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177 was touching) */
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178 reset_context_cache (&context_cache);
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179 reset_context_cache (&bol_context_cache);
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180 }
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181 /* OK, now we know that the start is after the beginning of the
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182 current top-level form. */
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183 else if (start < bol_context_cache.cur_point)
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184 {
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185 if (font_lock_debug)
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186 stderr_out ("font-lock; Case 3 (1)\n");
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187 /* case 3: after the beginning of the current top-level form
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188 and before both of the caches */
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189 reset_context_cache (&context_cache);
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190 reset_context_cache (&bol_context_cache);
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191 }
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192 else if (start < context_cache.cur_point)
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193 {
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194 if (font_lock_debug)
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195 stderr_out ("font-lock; Case 3 (2)\n");
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196 /* case 3: but only need to invalidate one cache */
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197 context_cache = bol_context_cache;
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198 }
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199 /* OK, now we know that the start is after the caches. */
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200 else if (start >= context_cache.end_point)
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201 {
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202 if (font_lock_debug)
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203 stderr_out ("font-lock; Case 6\n");
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204 /* case 6: after the end of the current top-level form
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205 and after the caches. */
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206 }
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207 else if (orig_end <= context_cache.end_point - 2)
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208 {
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209 /* case 4: after the caches and before the end of the
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210 current top-level form */
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211 Charcount diff = new_end - orig_end;
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212 if (font_lock_debug)
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213 stderr_out ("font-lock; Case 4\n");
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214 context_cache.end_point += diff;
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215 bol_context_cache.end_point += diff;
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216 }
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217 else
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218 {
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219 if (font_lock_debug)
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220 stderr_out ("font-lock; Case 5\n");
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221 /* case 5: right at the end of the current top-level form */
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222 context_cache.end_point = context_cache.start_point - 1;
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223 bol_context_cache.end_point = context_cache.start_point - 1;
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224 }
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225 }
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226
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227 /* This function is called from Fkill_buffer(). */
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228
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229 void
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230 font_lock_buffer_was_killed (struct buffer *buf)
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231 {
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232 if (context_cache.buffer == buf)
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233 {
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234 reset_context_cache (&context_cache);
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235 reset_context_cache (&bol_context_cache);
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236 }
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237 }
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238
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239 static Bufpos
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240 beginning_of_defun (struct buffer *buf, Bufpos pt)
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241 {
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242 /* This function can GC */
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243 Bufpos opt = BUF_PT (buf);
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244 if (pt == BUF_BEGV (buf))
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245 return pt;
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246 BUF_SET_PT (buf, pt);
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247 /* There used to be some kludginess to call c++-beginning-of-defun
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248 if we're in C++ mode. There's no point in this any more;
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249 we're using cc-mode. If you really want to get the old c++
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250 mode working, fix it rather than the C code. */
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251 call0_in_buffer (buf, Qbeginning_of_defun);
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252 pt = BUF_PT (buf);
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253 BUF_SET_PT (buf, opt);
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254 return pt;
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255 }
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256
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257 static Bufpos
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258 end_of_defun (struct buffer *buf, Bufpos pt)
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259 {
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260 Lisp_Object retval = scan_lists (buf, pt, 1, 0, 0, 1);
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261 if (NILP (retval))
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262 return BUF_ZV (buf);
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263 else
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264 return XINT (retval);
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265 }
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266
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267 /* Set up context_cache for attempting to determine the syntactic context
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268 in buffer BUF at point PT. */
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269
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270 static void
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271 setup_context_cache (struct buffer *buf, Bufpos pt)
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272 {
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273 int recomputed_start_point = 0;
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274 /* This function can GC */
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275 if (context_cache.buffer != buf || pt < context_cache.start_point)
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276 {
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277 start_over:
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278 if (font_lock_debug)
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279 stderr_out ("reset context cache\n");
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280 /* OK, completely invalid. */
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281 reset_context_cache (&context_cache);
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282 reset_context_cache (&bol_context_cache);
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283 }
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284 if (!context_cache.buffer)
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285 {
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286 /* Need to recompute the start point. */
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287 if (font_lock_debug)
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288 stderr_out ("recompute start\n");
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289 context_cache.start_point = beginning_of_defun (buf, pt);
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290 recomputed_start_point = 1;
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291 bol_context_cache.start_point = context_cache.start_point;
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292 bol_context_cache.buffer = context_cache.buffer = buf;
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293 }
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294 if (context_cache.end_point < context_cache.start_point)
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295 {
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296 /* Need to recompute the end point. */
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297 if (font_lock_debug)
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298 stderr_out ("recompute end\n");
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299 context_cache.end_point = end_of_defun (buf, context_cache.start_point);
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300 bol_context_cache.end_point = context_cache.end_point;
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301 }
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302 if (bol_context_cache.cur_point == 0 ||
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303 pt < bol_context_cache.cur_point)
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304 {
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305 if (font_lock_debug)
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306 stderr_out ("reset to start\n");
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307 if (pt > context_cache.end_point
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308 /* 3000 is some arbitrary delta but seems reasonable;
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309 about the size of a reasonable function */
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310 && pt - context_cache.end_point > 3000)
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311 /* If we're far past the end of the top level form,
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312 don't trust it; recompute it. */
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313 {
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314 /* But don't get in an infinite loop doing this.
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315 If we're really far past the end of the top level
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316 form, try to compute a pseudo-top-level form. */
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317 if (recomputed_start_point)
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318 context_cache.needs_its_head_reexamined = 1;
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319 else
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320 /* force recomputation */
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321 goto start_over;
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322 }
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323 /* Go to the nearest end of the top-level form that's before
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324 us. */
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325 if (pt > context_cache.end_point)
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326 pt = context_cache.end_point;
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327 else
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328 pt = context_cache.start_point;
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329 /* Reset current point to start of buffer. */
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330 context_cache.cur_point = pt;
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331 context_cache.context = context_none;
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332 context_cache.ccontext = ccontext_none;
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333 context_cache.style = comment_style_none;
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334 context_cache.scontext = '\000';
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335 context_cache.depth = 0;
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336 context_cache.backslash_p = ((pt > 1) &&
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337 (BUF_FETCH_CHAR (buf, pt - 1) == '\\'));
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338 /* Note that the BOL context cache may not be at the beginning
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339 of the line, but that should be OK, nobody's checking. */
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340 bol_context_cache = context_cache;
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341 return;
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342 }
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343 else if (pt < context_cache.cur_point)
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344 {
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345 if (font_lock_debug)
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346 stderr_out ("reset to bol\n");
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347 /* bol cache is OK but current_cache is not. */
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348 context_cache = bol_context_cache;
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349 return;
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350 }
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351 else if (pt <= context_cache.end_point)
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352 {
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353 if (font_lock_debug)
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354 stderr_out ("everything is OK\n");
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355 /* in same top-level form. */
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356 return;
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357 }
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358 {
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359 /* OK, we're past the end of the top-level form. */
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360 Bufpos maxpt = max (context_cache.end_point, context_cache.cur_point);
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361 #if 0
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362 int shortage;
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363 #endif
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364
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365 if (font_lock_debug)
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366 stderr_out ("past end\n");
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367 if (pt <= maxpt)
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368 /* OK, fine. */
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369 return;
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370 #if 0
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371 /* This appears to cause huge slowdowns in files like
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372 emacsfns.h, which have no top-level forms.
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373
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374 In any case, it's not really necessary that we know for
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375 sure the top-level form we're in; if we're in a form
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376 but the form we have recorded is the previous one,
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377 it will be OK. */
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378
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379 scan_buffer (buf, '\n', maxpt, pt, 1, &shortage, 1);
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380 if (!shortage)
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381 /* If there was a newline in the region past the known universe,
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382 we might be inside another top-level form, so start over.
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383 Otherwise, we're outside of any top-level forms and we know
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384 the one directly before us, so it's OK. */
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385 goto start_over;
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386 #endif
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387 }
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388 }
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389
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390 #define SYNTAX_START_STYLE(table, c1, c2) \
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391 (SYNTAX_STYLES_MATCH_START_P (table, c1, c2, SYNTAX_COMMENT_STYLE_A) ? \
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392 comment_style_a : \
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393 SYNTAX_STYLES_MATCH_START_P (table, c1, c2, SYNTAX_COMMENT_STYLE_B) ? \
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394 comment_style_b : \
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395 comment_style_none)
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396
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|
|
397 #define SYNTAX_END_STYLE(table, c1, c2) \
|
|
|
398 (SYNTAX_STYLES_MATCH_END_P (table, c1, c2, SYNTAX_COMMENT_STYLE_A) ? \
|
|
|
399 comment_style_a : \
|
|
|
400 SYNTAX_STYLES_MATCH_END_P (table, c1, c2, SYNTAX_COMMENT_STYLE_B) ? \
|
|
|
401 comment_style_b : \
|
|
|
402 comment_style_none)
|
|
|
403
|
|
|
404 #define SINGLE_SYNTAX_STYLE(table, c) \
|
|
|
405 (SYNTAX_STYLES_MATCH_1CHAR_P (table, c, SYNTAX_COMMENT_STYLE_A) ? \
|
|
|
406 comment_style_a : \
|
|
|
407 SYNTAX_STYLES_MATCH_1CHAR_P (table, c, SYNTAX_COMMENT_STYLE_B) ? \
|
|
|
408 comment_style_b : \
|
|
|
409 comment_style_none)
|
|
|
410
|
|
|
411 /* Set up context_cache for position PT in BUF. */
|
|
|
412
|
|
|
413 static void
|
|
|
414 find_context (struct buffer *buf, Bufpos pt)
|
|
|
415 {
|
|
|
416 /* This function can GC */
|
|
16
|
417 Lisp_Object syntaxtab = buf->syntax_table;
|
|
0
|
418 Emchar prev_c, c;
|
|
|
419 Bufpos target = pt;
|
|
|
420 setup_context_cache (buf, pt);
|
|
|
421 pt = context_cache.cur_point;
|
|
|
422
|
|
|
423 if (pt > BUF_BEGV (buf))
|
|
|
424 c = BUF_FETCH_CHAR (buf, pt - 1);
|
|
|
425 else
|
|
|
426 c = '\n'; /* to get bol_context_cache at point-min */
|
|
|
427
|
|
|
428 for (; pt < target; pt++, context_cache.cur_point = pt)
|
|
|
429 {
|
|
|
430 if (context_cache.needs_its_head_reexamined)
|
|
|
431 {
|
|
|
432 if (context_cache.depth == 0
|
|
|
433 && context_cache.context == ccontext_none)
|
|
|
434 {
|
|
|
435 /* We've found an anchor spot.
|
|
|
436 Try to put the start of defun within 6000 chars of
|
|
|
437 the target, and the end of defun as close as possible.
|
|
|
438 6000 is also arbitrary but tries to strike a balance
|
|
|
439 between two conflicting pulls when dealing with a
|
|
|
440 file that has lots of stuff sitting outside of a top-
|
|
|
441 level form:
|
|
|
442
|
|
|
443 a) If you move past the start of defun, you will
|
|
|
444 have to recompute defun, which in this case
|
|
|
445 means that start of defun goes all the way back
|
|
2
|
446 to the beginning of the file; so you want
|
|
0
|
447 to set start of defun a ways back from the
|
|
|
448 current point.
|
|
|
449 b) If you move a line backwards but within start of
|
|
|
450 defun, you have to move back to start of defun;
|
|
|
451 so you don't want start of defun too far from
|
|
|
452 the current point.
|
|
|
453 */
|
|
|
454 if (target - context_cache.start_point > 6000)
|
|
|
455 context_cache.start_point = pt;
|
|
|
456 context_cache.end_point = pt;
|
|
|
457 bol_context_cache = context_cache;
|
|
|
458 }
|
|
|
459 }
|
|
|
460
|
|
|
461 prev_c = c;
|
|
|
462 c = BUF_FETCH_CHAR (buf, pt);
|
|
|
463
|
|
|
464 if (prev_c == '\n')
|
|
|
465 bol_context_cache = context_cache;
|
|
|
466
|
|
|
467 if (context_cache.backslash_p)
|
|
|
468 {
|
|
|
469 context_cache.backslash_p = 0;
|
|
|
470 continue;
|
|
|
471 }
|
|
|
472
|
|
16
|
473 switch (SYNTAX (syntaxtab, c))
|
|
0
|
474 {
|
|
|
475 case Sescape:
|
|
|
476 context_cache.backslash_p = 1;
|
|
|
477 break;
|
|
|
478
|
|
|
479 case Sopen:
|
|
|
480 if (context_cache.context == context_none)
|
|
|
481 context_cache.depth++;
|
|
|
482 break;
|
|
|
483
|
|
|
484 case Sclose:
|
|
|
485 if (context_cache.context == context_none)
|
|
|
486 context_cache.depth--;
|
|
|
487 break;
|
|
|
488
|
|
|
489 case Scomment:
|
|
|
490 if (context_cache.context == context_none)
|
|
|
491 {
|
|
|
492 context_cache.context = context_comment;
|
|
|
493 context_cache.ccontext = ccontext_none;
|
|
16
|
494 context_cache.style = SINGLE_SYNTAX_STYLE (syntaxtab, c);
|
|
0
|
495 if (context_cache.style == comment_style_none) abort ();
|
|
|
496 }
|
|
|
497 break;
|
|
|
498
|
|
|
499 case Sendcomment:
|
|
16
|
500 if (context_cache.style != SINGLE_SYNTAX_STYLE (syntaxtab, c))
|
|
0
|
501 ;
|
|
|
502 else if (context_cache.context == context_comment)
|
|
|
503 {
|
|
|
504 context_cache.context = context_none;
|
|
|
505 context_cache.style = comment_style_none;
|
|
|
506 }
|
|
|
507 else if (context_cache.context == context_block_comment &&
|
|
|
508 (context_cache.ccontext == ccontext_start2 ||
|
|
|
509 context_cache.ccontext == ccontext_end1))
|
|
|
510 {
|
|
|
511 context_cache.context = context_none;
|
|
|
512 context_cache.ccontext = ccontext_none;
|
|
|
513 context_cache.style = comment_style_none;
|
|
|
514 }
|
|
|
515 break;
|
|
|
516
|
|
|
517 case Sstring:
|
|
|
518 {
|
|
|
519 if (context_cache.context == context_string &&
|
|
|
520 context_cache.scontext == c)
|
|
|
521 {
|
|
|
522 context_cache.context = context_none;
|
|
|
523 context_cache.scontext = '\000';
|
|
|
524 }
|
|
|
525 else if (context_cache.context == context_none)
|
|
|
526 {
|
|
16
|
527 Lisp_Object stringtermobj = syntax_match (syntaxtab, c);
|
|
0
|
528 Emchar stringterm;
|
|
|
529
|
|
|
530 if (CHARP (stringtermobj))
|
|
|
531 stringterm = XCHAR (stringtermobj);
|
|
|
532 else
|
|
|
533 stringterm = c;
|
|
|
534 context_cache.context = context_string;
|
|
|
535 context_cache.scontext = stringterm;
|
|
|
536 context_cache.ccontext = ccontext_none;
|
|
|
537 }
|
|
|
538 break;
|
|
|
539 }
|
|
|
540 default:
|
|
|
541 ;
|
|
|
542 }
|
|
|
543
|
|
|
544 /* That takes care of the characters with manifest syntax.
|
|
|
545 Now we've got to hack multi-char sequences that start
|
|
|
546 and end block comments.
|
|
|
547 */
|
|
16
|
548 if ((SYNTAX_COMMENT_BITS (syntaxtab, c) &
|
|
0
|
549 SYNTAX_SECOND_CHAR_START) &&
|
|
|
550 context_cache.context == context_none &&
|
|
|
551 context_cache.ccontext == ccontext_start1 &&
|
|
16
|
552 SYNTAX_START_P (syntaxtab, prev_c, c) /* the two chars match */
|
|
0
|
553 )
|
|
|
554 {
|
|
|
555 context_cache.ccontext = ccontext_start2;
|
|
16
|
556 context_cache.style = SYNTAX_START_STYLE (syntaxtab, prev_c, c);
|
|
0
|
557 if (context_cache.style == comment_style_none) abort ();
|
|
|
558 }
|
|
16
|
559 else if ((SYNTAX_COMMENT_BITS (syntaxtab, c) &
|
|
0
|
560 SYNTAX_FIRST_CHAR_START) &&
|
|
|
561 context_cache.context == context_none &&
|
|
|
562 (context_cache.ccontext == ccontext_none ||
|
|
|
563 context_cache.ccontext == ccontext_start1))
|
|
|
564 {
|
|
|
565 context_cache.ccontext = ccontext_start1;
|
|
|
566 context_cache.style = comment_style_none; /* should be this already*/
|
|
|
567 }
|
|
16
|
568 else if ((SYNTAX_COMMENT_BITS (syntaxtab, c) &
|
|
0
|
569 SYNTAX_SECOND_CHAR_END) &&
|
|
|
570 context_cache.context == context_block_comment &&
|
|
|
571 context_cache.ccontext == ccontext_end1 &&
|
|
16
|
572 SYNTAX_END_P (syntaxtab, prev_c, c) &&
|
|
0
|
573 /* the two chars match */
|
|
|
574 context_cache.style ==
|
|
16
|
575 SYNTAX_END_STYLE (syntaxtab, prev_c, c)
|
|
0
|
576 )
|
|
|
577 {
|
|
|
578 context_cache.context = context_none;
|
|
|
579 context_cache.ccontext = ccontext_none;
|
|
|
580 context_cache.style = comment_style_none;
|
|
|
581 }
|
|
16
|
582 else if ((SYNTAX_COMMENT_BITS (syntaxtab, c) &
|
|
0
|
583 SYNTAX_FIRST_CHAR_END) &&
|
|
|
584 context_cache.context == context_block_comment &&
|
|
|
585 (context_cache.style ==
|
|
16
|
586 SYNTAX_END_STYLE (syntaxtab, c,
|
|
0
|
587 BUF_FETCH_CHAR (buf, pt+1))) &&
|
|
|
588 (context_cache.ccontext == ccontext_start2 ||
|
|
|
589 context_cache.ccontext == ccontext_end1))
|
|
|
590 /* #### is it right to check for end1 here?? */
|
|
|
591 {
|
|
|
592 if (context_cache.style == comment_style_none) abort ();
|
|
|
593 context_cache.ccontext = ccontext_end1;
|
|
|
594 }
|
|
|
595
|
|
|
596 else if (context_cache.ccontext == ccontext_start1)
|
|
|
597 {
|
|
|
598 if (context_cache.context != context_none) abort ();
|
|
|
599 context_cache.ccontext = ccontext_none;
|
|
|
600 }
|
|
|
601 else if (context_cache.ccontext == ccontext_end1)
|
|
|
602 {
|
|
|
603 if (context_cache.context != context_block_comment) abort ();
|
|
|
604 context_cache.context = context_none;
|
|
|
605 context_cache.ccontext = ccontext_start2;
|
|
|
606 }
|
|
|
607
|
|
|
608 if (context_cache.ccontext == ccontext_start2 &&
|
|
|
609 context_cache.context == context_none)
|
|
|
610 {
|
|
|
611 context_cache.context = context_block_comment;
|
|
|
612 if (context_cache.style == comment_style_none) abort ();
|
|
|
613 }
|
|
|
614 else if (context_cache.ccontext == ccontext_none &&
|
|
|
615 context_cache.context == context_block_comment)
|
|
|
616 {
|
|
|
617 context_cache.context = context_none;
|
|
|
618 }
|
|
|
619 }
|
|
|
620
|
|
|
621 context_cache.needs_its_head_reexamined = 0;
|
|
|
622 }
|
|
|
623
|
|
|
624 static Lisp_Object
|
|
|
625 context_to_symbol (enum syntactic_context context)
|
|
|
626 {
|
|
|
627 switch (context)
|
|
|
628 {
|
|
|
629 case context_none: return (Qnil);
|
|
|
630 case context_string: return (Qstring);
|
|
|
631 case context_comment: return (Qcomment);
|
|
|
632 case context_block_comment: return (Qblock_comment);
|
|
|
633 default: abort ();
|
|
|
634 }
|
|
|
635 return Qnil; /* suppress compiler warning */
|
|
|
636 }
|
|
|
637
|
|
20
|
638 DEFUN ("buffer-syntactic-context", Fbuffer_syntactic_context, 0, 1, 0, /*
|
|
0
|
639 Return the syntactic context of BUFFER at point.
|
|
|
640 If BUFFER is nil or omitted, the current buffer is assumed.
|
|
|
641 The returned value is one of the following symbols:
|
|
|
642
|
|
|
643 nil ; meaning no special interpretation
|
|
|
644 string ; meaning point is within a string
|
|
|
645 comment ; meaning point is within a line comment
|
|
|
646 block-comment ; meaning point is within a block comment
|
|
|
647
|
|
|
648 See also the function `buffer-syntactic-context-depth', which returns
|
|
|
649 the current nesting-depth within all parenthesis-syntax delimiters
|
|
|
650 and the function `syntactically-sectionize', which will map a function
|
|
|
651 over each syntactic context in a region.
|
|
|
652
|
|
|
653 WARNING: this may alter match-data.
|
|
20
|
654 */
|
|
|
655 (buffer))
|
|
0
|
656 {
|
|
|
657 /* This function can GC */
|
|
|
658 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
659 find_context (buf, BUF_PT (buf));
|
|
|
660 return context_to_symbol (context_cache.context);
|
|
|
661 }
|
|
|
662
|
|
20
|
663 DEFUN ("buffer-syntactic-context-depth",
|
|
|
664 Fbuffer_syntactic_context_depth, 0, 1, 0, /*
|
|
0
|
665 Return the depth within all parenthesis-syntax delimiters at point.
|
|
|
666 If BUFFER is nil or omitted, the current buffer is assumed.
|
|
|
667 WARNING: this may alter match-data.
|
|
20
|
668 */
|
|
|
669 (buffer))
|
|
0
|
670 {
|
|
|
671 /* This function can GC */
|
|
|
672 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
673 find_context (buf, BUF_PT (buf));
|
|
|
674 return make_int (context_cache.depth);
|
|
|
675 }
|
|
|
676
|
|
|
677
|
|
20
|
678 DEFUN ("syntactically-sectionize", Fsyntactically_sectionize, 3, 4, 0, /*
|
|
0
|
679 Calls FUNCTION for each contiguous syntactic context in the region.
|
|
|
680 Calls the given function with four arguments: the start and end of the
|
|
|
681 region, a symbol representing the syntactic context, and the current
|
|
|
682 depth (as returned by the functions `buffer-syntactic-context' and
|
|
|
683 `buffer-syntactic-context-depth'). When this function is called, the
|
|
|
684 current buffer will be set to BUFFER.
|
|
|
685
|
|
|
686 WARNING: this may alter match-data.
|
|
20
|
687 */
|
|
|
688 (function, start, end, buffer))
|
|
0
|
689 {
|
|
|
690 /* This function can GC */
|
|
|
691 Bufpos s, pt, e;
|
|
|
692 int edepth;
|
|
|
693 enum syntactic_context this_context;
|
|
|
694 Lisp_Object extent = Qnil;
|
|
|
695 struct gcpro gcpro1;
|
|
|
696 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
697
|
|
|
698 get_buffer_range_char (buf, start, end, &s, &e, 0);
|
|
|
699
|
|
|
700 pt = s;
|
|
|
701 find_context (buf, pt);
|
|
|
702
|
|
|
703 GCPRO1 (extent);
|
|
|
704 while (pt < e)
|
|
|
705 {
|
|
|
706 Bufpos estart, eend;
|
|
|
707 /* skip over "blank" areas, and bug out at end-of-buffer. */
|
|
|
708 while (context_cache.context == context_none)
|
|
|
709 {
|
|
|
710 pt++;
|
|
|
711 if (pt >= e) goto DONE_LABEL;
|
|
|
712 find_context (buf, pt);
|
|
|
713 }
|
|
|
714 /* We've found a non-blank area; keep going until we reach its end */
|
|
|
715 this_context = context_cache.context;
|
|
|
716 estart = pt;
|
|
|
717
|
|
|
718 /* Minor kludge: consider the comment-start character(s) a part of
|
|
|
719 the comment.
|
|
|
720 */
|
|
|
721 if (this_context == context_block_comment &&
|
|
|
722 context_cache.ccontext == ccontext_start2)
|
|
|
723 estart -= 2;
|
|
|
724 else if (this_context == context_comment)
|
|
|
725 estart -= 1;
|
|
|
726
|
|
|
727 edepth = context_cache.depth;
|
|
|
728 while (context_cache.context == this_context && pt < e)
|
|
|
729 {
|
|
|
730 pt++;
|
|
|
731 find_context (buf, pt);
|
|
|
732 }
|
|
|
733
|
|
|
734 eend = pt;
|
|
|
735
|
|
|
736 /* Minor kludge: consider the character which terminated the comment
|
|
|
737 a part of the comment.
|
|
|
738 */
|
|
|
739 if ((this_context == context_block_comment ||
|
|
|
740 this_context == context_comment)
|
|
|
741 && pt < e)
|
|
|
742 eend++;
|
|
|
743
|
|
|
744 if (estart == eend)
|
|
|
745 continue;
|
|
|
746 /* Make sure not to pass in values that are outside the
|
|
|
747 actual bounds of this function. */
|
|
|
748 call4_in_buffer (buf, function, make_int (max (s, estart)),
|
|
|
749 make_int (eend == e ? e : eend - 1),
|
|
|
750 context_to_symbol (this_context),
|
|
|
751 make_int (edepth));
|
|
|
752 }
|
|
|
753 DONE_LABEL:
|
|
|
754 UNGCPRO;
|
|
|
755 return Qnil;
|
|
|
756 }
|
|
|
757
|
|
|
758 void
|
|
|
759 syms_of_font_lock (void)
|
|
|
760 {
|
|
|
761 defsymbol (&Qcomment, "comment");
|
|
|
762 defsymbol (&Qblock_comment, "block-comment");
|
|
|
763 defsymbol (&Qbeginning_of_defun, "beginning-of-defun");
|
|
|
764
|
|
20
|
765 DEFSUBR (Fbuffer_syntactic_context);
|
|
|
766 DEFSUBR (Fbuffer_syntactic_context_depth);
|
|
|
767 DEFSUBR (Fsyntactically_sectionize);
|
|
0
|
768 }
|
|
|
769
|
|
|
770 void
|
|
|
771 vars_of_font_lock (void)
|
|
|
772 {
|
|
|
773 memset (&context_cache, 0, sizeof (context_cache));
|
|
|
774 memset (&bol_context_cache, 0, sizeof (bol_context_cache));
|
|
|
775 }
|
