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428
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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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460
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62 context_block_comment,
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63 context_generic_comment,
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64 context_generic_string
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428
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65 };
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66
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67 enum block_comment_context
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68 {
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69 ccontext_none,
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70 ccontext_start1,
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71 ccontext_start2,
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72 ccontext_end1
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73 };
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74
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75 enum comment_style
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76 {
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77 comment_style_none,
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78 comment_style_a,
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79 comment_style_b
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80 };
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81
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82 struct context_cache
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83 {
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84 Bufpos start_point; /* beginning of defun */
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85 Bufpos cur_point; /* cache location */
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86 Bufpos end_point; /* end of defun */
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87 struct buffer *buffer; /* does this need to be staticpro'd? */
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88 enum syntactic_context context; /* single-char-syntax state */
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89 enum block_comment_context ccontext; /* block-comment state */
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90 enum comment_style style; /* which comment group */
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91 Emchar scontext; /* active string delimiter */
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92 int depth; /* depth in parens */
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93 int backslash_p; /* just read a backslash */
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94 int needs_its_head_reexamined; /* we're apparently outside of
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95 a top level form, and far away
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96 from it. This is a bad situation
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97 because it will lead to constant
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98 slowness as we keep going way
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99 back to that form and moving
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100 forward again. In this case,
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101 we try to compute a "pseudo-
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102 top-level-form" where the
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103 depth is 0 and the context
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104 is none at both ends. */
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105 };
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106
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107 /* We have two caches; one for the current point and one for
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108 the beginning of line. We used to rely on the caller to
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109 tell us when to invalidate them, but now we do it ourselves;
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110 it lets us be smarter. */
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111
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112 static struct context_cache context_cache;
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113
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114 static struct context_cache bol_context_cache;
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115
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116 int font_lock_debug;
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117
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118 #define reset_context_cache(cc) memset (cc, 0, sizeof (struct context_cache))
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119
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120 /* This function is called from signal_after_change() to tell us when
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121 textual changes are made so we can flush our caches when necessary.
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122
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123 We make the following somewhat heuristic assumptions:
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124
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125 (remember that current_point is always >= start_point, but may be
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126 less than or greater than end_point (we might not be inside any
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127 top-level form)).
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128
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129 1) Textual changes before the beginning of the current top-level form
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130 don't affect anything; all we need to do is offset the caches
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131 appropriately.
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132 2) Textual changes right at the beginning of the current
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133 top-level form messes things up and requires that we flush
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134 the caches.
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135 3) Textual changes after the beginning of the current top-level form
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136 and before one or both or the caches invalidates the corresponding
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137 cache(s).
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138 4) Textual changes after the caches and before the end of the
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139 current top-level form don't affect anything; all we need to do is
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140 offset the caches appropriately.
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141 5) Textual changes right at the end of the current top-level form
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142 necessitate recomputing that end value.
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143 6) Textual changes after the end of the current top-level form
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144 are ignored. */
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145
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146
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147 void
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148 font_lock_maybe_update_syntactic_caches (struct buffer *buf, Bufpos start,
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149 Bufpos orig_end, Bufpos new_end)
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150 {
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151 /* Note: either both context_cache and bol_context_cache are valid and
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152 point to the same buffer, or both are invalid. If we have to
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153 invalidate just context_cache, we recopy it from bol_context_cache.
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154 */
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155 if (context_cache.buffer != buf)
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156 /* caches don't apply */
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157 return;
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158 /* NOTE: The order of the if statements below is important. If you
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159 change them around unthinkingly, you will probably break something. */
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160 if (orig_end <= context_cache.start_point - 1)
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161 {
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162 /* case 1: before the beginning of the current top-level form */
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163 Charcount diff = new_end - orig_end;
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164 if (font_lock_debug)
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165 stderr_out ("font-lock; Case 1\n");
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166 context_cache.start_point += diff;
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167 context_cache.cur_point += diff;
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168 context_cache.end_point += diff;
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169 bol_context_cache.start_point += diff;
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170 bol_context_cache.cur_point += diff;
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171 bol_context_cache.end_point += diff;
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172 }
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173 else if (start <= context_cache.start_point)
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174 {
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175 if (font_lock_debug)
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176 stderr_out ("font-lock; Case 2\n");
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177 /* case 2: right at the current top-level form (paren that starts
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178 top level form got deleted or moved away from the newline it
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179 was touching) */
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180 reset_context_cache (&context_cache);
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181 reset_context_cache (&bol_context_cache);
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182 }
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183 /* OK, now we know that the start is after the beginning of the
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184 current top-level form. */
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185 else if (start < bol_context_cache.cur_point)
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186 {
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187 if (font_lock_debug)
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188 stderr_out ("font-lock; Case 3 (1)\n");
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189 /* case 3: after the beginning of the current top-level form
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190 and before both of the caches */
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191 reset_context_cache (&context_cache);
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192 reset_context_cache (&bol_context_cache);
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193 }
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194 else if (start < context_cache.cur_point)
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195 {
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196 if (font_lock_debug)
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197 stderr_out ("font-lock; Case 3 (2)\n");
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198 /* case 3: but only need to invalidate one cache */
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199 context_cache = bol_context_cache;
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200 }
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201 /* OK, now we know that the start is after the caches. */
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202 else if (start >= context_cache.end_point)
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203 {
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204 if (font_lock_debug)
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205 stderr_out ("font-lock; Case 6\n");
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206 /* case 6: after the end of the current top-level form
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207 and after the caches. */
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208 }
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209 else if (orig_end <= context_cache.end_point - 2)
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210 {
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211 /* case 4: after the caches and before the end of the
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212 current top-level form */
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213 Charcount diff = new_end - orig_end;
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214 if (font_lock_debug)
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215 stderr_out ("font-lock; Case 4\n");
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216 context_cache.end_point += diff;
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217 bol_context_cache.end_point += diff;
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|
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218 }
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219 else
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|
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220 {
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|
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221 if (font_lock_debug)
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222 stderr_out ("font-lock; Case 5\n");
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223 /* case 5: right at the end of the current top-level form */
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224 context_cache.end_point = context_cache.start_point - 1;
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225 bol_context_cache.end_point = context_cache.start_point - 1;
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226 }
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|
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227 }
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|
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228
|
|
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229 /* This function is called from Fkill_buffer(). */
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230
|
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231 void
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232 font_lock_buffer_was_killed (struct buffer *buf)
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233 {
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234 if (context_cache.buffer == buf)
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235 {
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236 reset_context_cache (&context_cache);
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237 reset_context_cache (&bol_context_cache);
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|
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238 }
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|
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239 }
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240
|
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241 static Bufpos
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242 beginning_of_defun (struct buffer *buf, Bufpos pt)
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243 {
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244 /* This function can GC */
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245 Bufpos opt = BUF_PT (buf);
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246 if (pt == BUF_BEGV (buf))
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247 return pt;
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248 BUF_SET_PT (buf, pt);
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249 /* There used to be some kludginess to call c++-beginning-of-defun
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250 if we're in C++ mode. There's no point in this any more;
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251 we're using cc-mode. If you really want to get the old c++
|
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252 mode working, fix it rather than the C code. */
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253 call0_in_buffer (buf, Qbeginning_of_defun);
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254 pt = BUF_PT (buf);
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255 BUF_SET_PT (buf, opt);
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256 return pt;
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|
|
257 }
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|
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258
|
|
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259 static Bufpos
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260 end_of_defun (struct buffer *buf, Bufpos pt)
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|
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261 {
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262 Lisp_Object retval = scan_lists (buf, pt, 1, 0, 0, 1);
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263 if (NILP (retval))
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264 return BUF_ZV (buf);
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265 else
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266 return XINT (retval);
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|
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267 }
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|
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268
|
|
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269 /* Set up context_cache for attempting to determine the syntactic context
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270 in buffer BUF at point PT. */
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271
|
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272 static void
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273 setup_context_cache (struct buffer *buf, Bufpos pt)
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|
|
274 {
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|
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275 int recomputed_start_point = 0;
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|
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276 /* This function can GC */
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277 if (context_cache.buffer != buf || pt < context_cache.start_point)
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|
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278 {
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|
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279 start_over:
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280 if (font_lock_debug)
|
|
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281 stderr_out ("reset context cache\n");
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|
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282 /* OK, completely invalid. */
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283 reset_context_cache (&context_cache);
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284 reset_context_cache (&bol_context_cache);
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|
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285 }
|
|
|
286 if (!context_cache.buffer)
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|
|
287 {
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|
|
288 /* Need to recompute the start point. */
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|
|
289 if (font_lock_debug)
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|
|
290 stderr_out ("recompute start\n");
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|
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291 context_cache.start_point = beginning_of_defun (buf, pt);
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|
|
292 recomputed_start_point = 1;
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|
|
293 bol_context_cache.start_point = context_cache.start_point;
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|
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294 bol_context_cache.buffer = context_cache.buffer = buf;
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|
|
295 }
|
|
|
296 if (context_cache.end_point < context_cache.start_point)
|
|
|
297 {
|
|
|
298 /* Need to recompute the end point. */
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|
|
299 if (font_lock_debug)
|
|
|
300 stderr_out ("recompute end\n");
|
|
|
301 context_cache.end_point = end_of_defun (buf, context_cache.start_point);
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|
|
302 bol_context_cache.end_point = context_cache.end_point;
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|
|
303 }
|
|
|
304 if (bol_context_cache.cur_point == 0 ||
|
|
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305 pt < bol_context_cache.cur_point)
|
|
|
306 {
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|
|
307 if (font_lock_debug)
|
|
|
308 stderr_out ("reset to start\n");
|
|
|
309 if (pt > context_cache.end_point
|
|
|
310 /* 3000 is some arbitrary delta but seems reasonable;
|
|
|
311 about the size of a reasonable function */
|
|
|
312 && pt - context_cache.end_point > 3000)
|
|
|
313 /* If we're far past the end of the top level form,
|
|
|
314 don't trust it; recompute it. */
|
|
|
315 {
|
|
|
316 /* But don't get in an infinite loop doing this.
|
|
|
317 If we're really far past the end of the top level
|
|
|
318 form, try to compute a pseudo-top-level form. */
|
|
|
319 if (recomputed_start_point)
|
|
|
320 context_cache.needs_its_head_reexamined = 1;
|
|
|
321 else
|
|
|
322 /* force recomputation */
|
|
|
323 goto start_over;
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|
|
324 }
|
|
|
325 /* Go to the nearest end of the top-level form that's before
|
|
|
326 us. */
|
|
|
327 if (pt > context_cache.end_point)
|
|
|
328 pt = context_cache.end_point;
|
|
|
329 else
|
|
|
330 pt = context_cache.start_point;
|
|
|
331 /* Reset current point to start of buffer. */
|
|
|
332 context_cache.cur_point = pt;
|
|
|
333 context_cache.context = context_none;
|
|
|
334 context_cache.ccontext = ccontext_none;
|
|
|
335 context_cache.style = comment_style_none;
|
|
|
336 context_cache.scontext = '\000';
|
|
|
337 context_cache.depth = 0;
|
|
460
|
338 /* #### shouldn't this be checking the character's syntax instead of
|
|
|
339 explicitly testing for backslash characters? */
|
|
428
|
340 context_cache.backslash_p = ((pt > 1) &&
|
|
|
341 (BUF_FETCH_CHAR (buf, pt - 1) == '\\'));
|
|
|
342 /* Note that the BOL context cache may not be at the beginning
|
|
|
343 of the line, but that should be OK, nobody's checking. */
|
|
|
344 bol_context_cache = context_cache;
|
|
|
345 return;
|
|
|
346 }
|
|
|
347 else if (pt < context_cache.cur_point)
|
|
|
348 {
|
|
|
349 if (font_lock_debug)
|
|
|
350 stderr_out ("reset to bol\n");
|
|
|
351 /* bol cache is OK but current_cache is not. */
|
|
|
352 context_cache = bol_context_cache;
|
|
|
353 return;
|
|
|
354 }
|
|
|
355 else if (pt <= context_cache.end_point)
|
|
|
356 {
|
|
|
357 if (font_lock_debug)
|
|
|
358 stderr_out ("everything is OK\n");
|
|
|
359 /* in same top-level form. */
|
|
|
360 return;
|
|
|
361 }
|
|
|
362 {
|
|
|
363 /* OK, we're past the end of the top-level form. */
|
|
|
364 Bufpos maxpt = max (context_cache.end_point, context_cache.cur_point);
|
|
|
365 #if 0
|
|
|
366 int shortage;
|
|
|
367 #endif
|
|
|
368
|
|
|
369 if (font_lock_debug)
|
|
|
370 stderr_out ("past end\n");
|
|
|
371 if (pt <= maxpt)
|
|
|
372 /* OK, fine. */
|
|
|
373 return;
|
|
|
374 #if 0
|
|
442
|
375 /* This appears to cause huge slowdowns in files which have no
|
|
|
376 top-level forms.
|
|
428
|
377
|
|
|
378 In any case, it's not really necessary that we know for
|
|
|
379 sure the top-level form we're in; if we're in a form
|
|
|
380 but the form we have recorded is the previous one,
|
|
|
381 it will be OK. */
|
|
|
382
|
|
|
383 scan_buffer (buf, '\n', maxpt, pt, 1, &shortage, 1);
|
|
|
384 if (!shortage)
|
|
|
385 /* If there was a newline in the region past the known universe,
|
|
|
386 we might be inside another top-level form, so start over.
|
|
|
387 Otherwise, we're outside of any top-level forms and we know
|
|
|
388 the one directly before us, so it's OK. */
|
|
|
389 goto start_over;
|
|
|
390 #endif
|
|
|
391 }
|
|
|
392 }
|
|
|
393
|
|
460
|
394 #define SYNTAX_START_STYLE(c1, c2) \
|
|
|
395 (SYNTAX_CODES_MATCH_START_P (c1, c2, SYNTAX_COMMENT_STYLE_A) ? \
|
|
428
|
396 comment_style_a : \
|
|
460
|
397 SYNTAX_CODES_MATCH_START_P (c1, c2, SYNTAX_COMMENT_STYLE_B) ? \
|
|
428
|
398 comment_style_b : \
|
|
|
399 comment_style_none)
|
|
|
400
|
|
460
|
401 #define SYNTAX_END_STYLE(c1, c2) \
|
|
|
402 (SYNTAX_CODES_MATCH_END_P (c1, c2, SYNTAX_COMMENT_STYLE_A) ? \
|
|
|
403 comment_style_a : \
|
|
|
404 SYNTAX_CODES_MATCH_END_P (c1, c2, SYNTAX_COMMENT_STYLE_B) ? \
|
|
|
405 comment_style_b : \
|
|
|
406 comment_style_none)
|
|
|
407
|
|
|
408 #define SINGLE_SYNTAX_STYLE(c) \
|
|
|
409 (SYNTAX_CODE_MATCHES_1CHAR_P (c, SYNTAX_COMMENT_STYLE_A) ? \
|
|
428
|
410 comment_style_a : \
|
|
460
|
411 SYNTAX_CODE_MATCHES_1CHAR_P (c, SYNTAX_COMMENT_STYLE_B) ? \
|
|
428
|
412 comment_style_b : \
|
|
|
413 comment_style_none)
|
|
|
414
|
|
|
415 /* Set up context_cache for position PT in BUF. */
|
|
|
416
|
|
|
417 static void
|
|
|
418 find_context (struct buffer *buf, Bufpos pt)
|
|
|
419 {
|
|
|
420 /* This function can GC */
|
|
460
|
421 #ifndef emacs
|
|
440
|
422 Lisp_Char_Table *mirrortab = XCHAR_TABLE (buf->mirror_syntax_table);
|
|
428
|
423 Lisp_Object syntaxtab = buf->syntax_table;
|
|
460
|
424 #endif
|
|
428
|
425 Emchar prev_c, c;
|
|
460
|
426 int prev_syncode, syncode;
|
|
428
|
427 Bufpos target = pt;
|
|
|
428 setup_context_cache (buf, pt);
|
|
|
429 pt = context_cache.cur_point;
|
|
|
430
|
|
460
|
431 SETUP_SYNTAX_CACHE (pt - 1, 1);
|
|
428
|
432 if (pt > BUF_BEGV (buf))
|
|
460
|
433 {
|
|
|
434 c = BUF_FETCH_CHAR (buf, pt - 1);
|
|
|
435 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
|
|
|
436 }
|
|
428
|
437 else
|
|
460
|
438 {
|
|
|
439 c = '\n'; /* to get bol_context_cache at point-min */
|
|
|
440 syncode = Swhitespace;
|
|
|
441 }
|
|
428
|
442
|
|
|
443 for (; pt < target; pt++, context_cache.cur_point = pt)
|
|
|
444 {
|
|
|
445 if (context_cache.needs_its_head_reexamined)
|
|
|
446 {
|
|
|
447 if (context_cache.depth == 0
|
|
|
448 && context_cache.context == context_none)
|
|
|
449 {
|
|
|
450 /* We've found an anchor spot.
|
|
|
451 Try to put the start of defun within 6000 chars of
|
|
|
452 the target, and the end of defun as close as possible.
|
|
|
453 6000 is also arbitrary but tries to strike a balance
|
|
|
454 between two conflicting pulls when dealing with a
|
|
|
455 file that has lots of stuff sitting outside of a top-
|
|
|
456 level form:
|
|
|
457
|
|
|
458 a) If you move past the start of defun, you will
|
|
|
459 have to recompute defun, which in this case
|
|
|
460 means that start of defun goes all the way back
|
|
|
461 to the beginning of the file; so you want
|
|
|
462 to set start of defun a ways back from the
|
|
|
463 current point.
|
|
|
464 b) If you move a line backwards but within start of
|
|
|
465 defun, you have to move back to start of defun;
|
|
|
466 so you don't want start of defun too far from
|
|
|
467 the current point.
|
|
|
468 */
|
|
|
469 if (target - context_cache.start_point > 6000)
|
|
|
470 context_cache.start_point = pt;
|
|
|
471 context_cache.end_point = pt;
|
|
|
472 bol_context_cache = context_cache;
|
|
|
473 }
|
|
|
474 }
|
|
|
475
|
|
460
|
476 UPDATE_SYNTAX_CACHE_FORWARD (pt);
|
|
428
|
477 prev_c = c;
|
|
460
|
478 prev_syncode = syncode;
|
|
428
|
479 c = BUF_FETCH_CHAR (buf, pt);
|
|
460
|
480 syncode = SYNTAX_CODE_FROM_CACHE (mirrortab, c);
|
|
428
|
481
|
|
|
482 if (prev_c == '\n')
|
|
|
483 bol_context_cache = context_cache;
|
|
|
484
|
|
|
485 if (context_cache.backslash_p)
|
|
|
486 {
|
|
|
487 context_cache.backslash_p = 0;
|
|
|
488 continue;
|
|
|
489 }
|
|
|
490
|
|
460
|
491 switch (SYNTAX_FROM_CACHE (mirrortab, c))
|
|
428
|
492 {
|
|
|
493 case Sescape:
|
|
|
494 context_cache.backslash_p = 1;
|
|
|
495 break;
|
|
|
496
|
|
|
497 case Sopen:
|
|
|
498 if (context_cache.context == context_none)
|
|
|
499 context_cache.depth++;
|
|
|
500 break;
|
|
|
501
|
|
|
502 case Sclose:
|
|
|
503 if (context_cache.context == context_none)
|
|
|
504 context_cache.depth--;
|
|
|
505 break;
|
|
|
506
|
|
|
507 case Scomment:
|
|
|
508 if (context_cache.context == context_none)
|
|
|
509 {
|
|
|
510 context_cache.context = context_comment;
|
|
|
511 context_cache.ccontext = ccontext_none;
|
|
460
|
512 context_cache.style = SINGLE_SYNTAX_STYLE (syncode);
|
|
428
|
513 if (context_cache.style == comment_style_none) abort ();
|
|
|
514 }
|
|
|
515 break;
|
|
|
516
|
|
|
517 case Sendcomment:
|
|
460
|
518 if (context_cache.style != SINGLE_SYNTAX_STYLE (syncode))
|
|
428
|
519 ;
|
|
|
520 else if (context_cache.context == context_comment)
|
|
|
521 {
|
|
|
522 context_cache.context = context_none;
|
|
|
523 context_cache.style = comment_style_none;
|
|
|
524 }
|
|
|
525 else if (context_cache.context == context_block_comment &&
|
|
|
526 (context_cache.ccontext == ccontext_start2 ||
|
|
|
527 context_cache.ccontext == ccontext_end1))
|
|
|
528 {
|
|
|
529 context_cache.context = context_none;
|
|
|
530 context_cache.ccontext = ccontext_none;
|
|
|
531 context_cache.style = comment_style_none;
|
|
|
532 }
|
|
|
533 break;
|
|
|
534
|
|
|
535 case Sstring:
|
|
|
536 {
|
|
|
537 if (context_cache.context == context_string &&
|
|
|
538 context_cache.scontext == c)
|
|
|
539 {
|
|
|
540 context_cache.context = context_none;
|
|
|
541 context_cache.scontext = '\000';
|
|
|
542 }
|
|
|
543 else if (context_cache.context == context_none)
|
|
|
544 {
|
|
460
|
545 Lisp_Object stringtermobj =
|
|
|
546 syntax_match (syntax_cache.current_syntax_table, c);
|
|
428
|
547 Emchar stringterm;
|
|
|
548
|
|
|
549 if (CHARP (stringtermobj))
|
|
|
550 stringterm = XCHAR (stringtermobj);
|
|
|
551 else
|
|
|
552 stringterm = c;
|
|
|
553 context_cache.context = context_string;
|
|
|
554 context_cache.scontext = stringterm;
|
|
|
555 context_cache.ccontext = ccontext_none;
|
|
|
556 }
|
|
|
557 break;
|
|
|
558 }
|
|
460
|
559
|
|
|
560 case Scomment_fence:
|
|
|
561 {
|
|
|
562 if (context_cache.context == context_generic_comment)
|
|
|
563 {
|
|
|
564 context_cache.context = context_none;
|
|
|
565 }
|
|
|
566 else if (context_cache.context == context_none)
|
|
|
567 {
|
|
|
568 context_cache.context = context_generic_comment;
|
|
|
569 context_cache.ccontext = ccontext_none;
|
|
|
570 }
|
|
|
571 break;
|
|
|
572 }
|
|
|
573
|
|
|
574 case Sstring_fence:
|
|
|
575 {
|
|
|
576 if (context_cache.context == context_generic_string)
|
|
|
577 {
|
|
|
578 context_cache.context = context_none;
|
|
|
579 }
|
|
|
580 else if (context_cache.context == context_none)
|
|
|
581 {
|
|
|
582 context_cache.context = context_generic_string;
|
|
|
583 context_cache.ccontext = ccontext_none;
|
|
|
584 }
|
|
|
585 break;
|
|
|
586 }
|
|
|
587
|
|
428
|
588 default:
|
|
|
589 ;
|
|
|
590 }
|
|
|
591
|
|
|
592 /* That takes care of the characters with manifest syntax.
|
|
|
593 Now we've got to hack multi-char sequences that start
|
|
|
594 and end block comments.
|
|
|
595 */
|
|
460
|
596 if ((SYNTAX_CODE_COMMENT_BITS (syncode) &
|
|
428
|
597 SYNTAX_SECOND_CHAR_START) &&
|
|
|
598 context_cache.context == context_none &&
|
|
|
599 context_cache.ccontext == ccontext_start1 &&
|
|
460
|
600 SYNTAX_CODES_START_P (prev_syncode, syncode) /* the two chars match */
|
|
428
|
601 )
|
|
|
602 {
|
|
|
603 context_cache.ccontext = ccontext_start2;
|
|
460
|
604 context_cache.style = SYNTAX_START_STYLE (prev_syncode, syncode);
|
|
428
|
605 if (context_cache.style == comment_style_none) abort ();
|
|
|
606 }
|
|
460
|
607 else if ((SYNTAX_CODE_COMMENT_BITS (syncode) &
|
|
428
|
608 SYNTAX_FIRST_CHAR_START) &&
|
|
|
609 context_cache.context == context_none &&
|
|
|
610 (context_cache.ccontext == ccontext_none ||
|
|
|
611 context_cache.ccontext == ccontext_start1))
|
|
|
612 {
|
|
|
613 context_cache.ccontext = ccontext_start1;
|
|
|
614 context_cache.style = comment_style_none; /* should be this already*/
|
|
|
615 }
|
|
460
|
616 else if ((SYNTAX_CODE_COMMENT_BITS (syncode) &
|
|
428
|
617 SYNTAX_SECOND_CHAR_END) &&
|
|
|
618 context_cache.context == context_block_comment &&
|
|
|
619 context_cache.ccontext == ccontext_end1 &&
|
|
460
|
620 SYNTAX_CODES_END_P (prev_syncode, syncode) &&
|
|
428
|
621 /* the two chars match */
|
|
|
622 context_cache.style ==
|
|
460
|
623 SYNTAX_END_STYLE (prev_syncode, syncode)
|
|
428
|
624 )
|
|
|
625 {
|
|
|
626 context_cache.context = context_none;
|
|
|
627 context_cache.ccontext = ccontext_none;
|
|
|
628 context_cache.style = comment_style_none;
|
|
|
629 }
|
|
460
|
630 else if ((SYNTAX_CODE_COMMENT_BITS (syncode) &
|
|
428
|
631 SYNTAX_FIRST_CHAR_END) &&
|
|
|
632 context_cache.context == context_block_comment &&
|
|
460
|
633 context_cache.style == SINGLE_SYNTAX_STYLE (syncode) &&
|
|
428
|
634 (context_cache.ccontext == ccontext_start2 ||
|
|
|
635 context_cache.ccontext == ccontext_end1))
|
|
460
|
636 /* #### is it right to check for end1 here??
|
|
|
637 yes, because this might be a repetition of the first char
|
|
|
638 of a comment-end sequence. ie, '/xxx foo xxx/' or
|
|
|
639 '/xxx foo x/', where 'x' = '*' -- mct */
|
|
428
|
640 {
|
|
|
641 if (context_cache.style == comment_style_none) abort ();
|
|
|
642 context_cache.ccontext = ccontext_end1;
|
|
|
643 }
|
|
|
644
|
|
|
645 else if (context_cache.ccontext == ccontext_start1)
|
|
|
646 {
|
|
|
647 if (context_cache.context != context_none) abort ();
|
|
|
648 context_cache.ccontext = ccontext_none;
|
|
|
649 }
|
|
|
650 else if (context_cache.ccontext == ccontext_end1)
|
|
|
651 {
|
|
|
652 if (context_cache.context != context_block_comment) abort ();
|
|
|
653 context_cache.context = context_none;
|
|
|
654 context_cache.ccontext = ccontext_start2;
|
|
|
655 }
|
|
|
656
|
|
|
657 if (context_cache.ccontext == ccontext_start2 &&
|
|
|
658 context_cache.context == context_none)
|
|
|
659 {
|
|
|
660 context_cache.context = context_block_comment;
|
|
|
661 if (context_cache.style == comment_style_none) abort ();
|
|
|
662 }
|
|
|
663 else if (context_cache.ccontext == ccontext_none &&
|
|
|
664 context_cache.context == context_block_comment)
|
|
|
665 {
|
|
|
666 context_cache.context = context_none;
|
|
|
667 }
|
|
|
668 }
|
|
|
669
|
|
|
670 context_cache.needs_its_head_reexamined = 0;
|
|
|
671 }
|
|
|
672
|
|
|
673 static Lisp_Object
|
|
|
674 context_to_symbol (enum syntactic_context context)
|
|
|
675 {
|
|
|
676 switch (context)
|
|
|
677 {
|
|
460
|
678 case context_none: return Qnil;
|
|
|
679 case context_string: return Qstring;
|
|
|
680 case context_comment: return Qcomment;
|
|
|
681 case context_block_comment: return Qblock_comment;
|
|
|
682 case context_generic_comment: return Qblock_comment;
|
|
|
683 case context_generic_string: return Qstring;
|
|
428
|
684 default: abort (); return Qnil; /* suppress compiler warning */
|
|
|
685 }
|
|
|
686 }
|
|
|
687
|
|
|
688 DEFUN ("buffer-syntactic-context", Fbuffer_syntactic_context, 0, 1, 0, /*
|
|
|
689 Return the syntactic context of BUFFER at point.
|
|
|
690 If BUFFER is nil or omitted, the current buffer is assumed.
|
|
|
691 The returned value is one of the following symbols:
|
|
|
692
|
|
|
693 nil ; meaning no special interpretation
|
|
|
694 string ; meaning point is within a string
|
|
|
695 comment ; meaning point is within a line comment
|
|
|
696 block-comment ; meaning point is within a block comment
|
|
|
697
|
|
|
698 See also the function `buffer-syntactic-context-depth', which returns
|
|
|
699 the current nesting-depth within all parenthesis-syntax delimiters
|
|
|
700 and the function `syntactically-sectionize', which will map a function
|
|
|
701 over each syntactic context in a region.
|
|
|
702
|
|
|
703 WARNING: this may alter match-data.
|
|
|
704 */
|
|
|
705 (buffer))
|
|
|
706 {
|
|
|
707 /* This function can GC */
|
|
|
708 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
709 find_context (buf, BUF_PT (buf));
|
|
|
710 return context_to_symbol (context_cache.context);
|
|
|
711 }
|
|
|
712
|
|
|
713 DEFUN ("buffer-syntactic-context-depth", Fbuffer_syntactic_context_depth,
|
|
|
714 0, 1, 0, /*
|
|
|
715 Return the depth within all parenthesis-syntax delimiters at point.
|
|
|
716 If BUFFER is nil or omitted, the current buffer is assumed.
|
|
|
717 WARNING: this may alter match-data.
|
|
|
718 */
|
|
|
719 (buffer))
|
|
|
720 {
|
|
|
721 /* This function can GC */
|
|
|
722 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
723 find_context (buf, BUF_PT (buf));
|
|
|
724 return make_int (context_cache.depth);
|
|
|
725 }
|
|
|
726
|
|
|
727
|
|
|
728 DEFUN ("syntactically-sectionize", Fsyntactically_sectionize, 3, 4, 0, /*
|
|
|
729 Call FUNCTION for each contiguous syntactic context in the region.
|
|
|
730 Call the given function with four arguments: the start and end of the
|
|
|
731 region, a symbol representing the syntactic context, and the current
|
|
|
732 depth (as returned by the functions `buffer-syntactic-context' and
|
|
|
733 `buffer-syntactic-context-depth'). When this function is called, the
|
|
|
734 current buffer will be set to BUFFER.
|
|
|
735
|
|
|
736 WARNING: this may alter match-data.
|
|
|
737 */
|
|
|
738 (function, start, end, buffer))
|
|
|
739 {
|
|
|
740 /* This function can GC */
|
|
|
741 Bufpos s, pt, e;
|
|
|
742 int edepth;
|
|
|
743 enum syntactic_context this_context;
|
|
|
744 Lisp_Object extent = Qnil;
|
|
|
745 struct gcpro gcpro1;
|
|
|
746 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
747
|
|
|
748 get_buffer_range_char (buf, start, end, &s, &e, 0);
|
|
|
749
|
|
|
750 pt = s;
|
|
|
751 find_context (buf, pt);
|
|
|
752
|
|
|
753 GCPRO1 (extent);
|
|
|
754 while (pt < e)
|
|
|
755 {
|
|
|
756 Bufpos estart, eend;
|
|
|
757 /* skip over "blank" areas, and bug out at end-of-buffer. */
|
|
|
758 while (context_cache.context == context_none)
|
|
|
759 {
|
|
|
760 pt++;
|
|
|
761 if (pt >= e) goto DONE_LABEL;
|
|
|
762 find_context (buf, pt);
|
|
|
763 }
|
|
|
764 /* We've found a non-blank area; keep going until we reach its end */
|
|
|
765 this_context = context_cache.context;
|
|
|
766 estart = pt;
|
|
|
767
|
|
|
768 /* Minor kludge: consider the comment-start character(s) a part of
|
|
|
769 the comment.
|
|
|
770 */
|
|
|
771 if (this_context == context_block_comment &&
|
|
|
772 context_cache.ccontext == ccontext_start2)
|
|
|
773 estart -= 2;
|
|
460
|
774 else if (this_context == context_comment
|
|
|
775 || this_context == context_generic_comment
|
|
|
776 )
|
|
428
|
777 estart -= 1;
|
|
|
778
|
|
|
779 edepth = context_cache.depth;
|
|
|
780 while (context_cache.context == this_context && pt < e)
|
|
|
781 {
|
|
|
782 pt++;
|
|
|
783 find_context (buf, pt);
|
|
|
784 }
|
|
|
785
|
|
|
786 eend = pt;
|
|
|
787
|
|
|
788 /* Minor kludge: consider the character which terminated the comment
|
|
|
789 a part of the comment.
|
|
|
790 */
|
|
|
791 if ((this_context == context_block_comment ||
|
|
460
|
792 this_context == context_comment
|
|
|
793 || this_context == context_generic_comment
|
|
|
794 )
|
|
428
|
795 && pt < e)
|
|
|
796 eend++;
|
|
|
797
|
|
|
798 if (estart == eend)
|
|
|
799 continue;
|
|
|
800 /* Make sure not to pass in values that are outside the
|
|
|
801 actual bounds of this function. */
|
|
|
802 call4_in_buffer (buf, function, make_int (max (s, estart)),
|
|
|
803 make_int (eend == e ? e : eend - 1),
|
|
|
804 context_to_symbol (this_context),
|
|
|
805 make_int (edepth));
|
|
|
806 }
|
|
|
807 DONE_LABEL:
|
|
|
808 UNGCPRO;
|
|
|
809 return Qnil;
|
|
|
810 }
|
|
|
811
|
|
|
812 void
|
|
|
813 syms_of_font_lock (void)
|
|
|
814 {
|
|
|
815 defsymbol (&Qcomment, "comment");
|
|
|
816 defsymbol (&Qblock_comment, "block-comment");
|
|
|
817 defsymbol (&Qbeginning_of_defun, "beginning-of-defun");
|
|
|
818
|
|
|
819 DEFSUBR (Fbuffer_syntactic_context);
|
|
|
820 DEFSUBR (Fbuffer_syntactic_context_depth);
|
|
|
821 DEFSUBR (Fsyntactically_sectionize);
|
|
|
822 }
|
|
|
823
|
|
|
824 void
|
|
|
825 reinit_vars_of_font_lock (void)
|
|
|
826 {
|
|
|
827 xzero (context_cache);
|
|
|
828 xzero (bol_context_cache);
|
|
|
829 }
|
|
|
830
|
|
|
831 void
|
|
|
832 vars_of_font_lock (void)
|
|
|
833 {
|
|
|
834 reinit_vars_of_font_lock ();
|
|
|
835 }
|
