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0
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1 /* XEmacs routines to deal with syntax tables; also word and list parsing.
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2 Copyright (C) 1985-1994 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: FSF 19.28. */
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23
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24 #include <config.h>
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25 #include "lisp.h"
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26
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27 #include "buffer.h"
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28 #include "commands.h"
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29 #include "insdel.h"
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30 #include "syntax.h"
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31
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32 Lisp_Object Qsyntax_table_p;
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33
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34 int words_include_escapes;
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35
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36 int parse_sexp_ignore_comments;
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37
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38 /* The following two variables are provided to tell additional information
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39 to the regex routines. We do it this way rather than change the
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40 arguments to re_search_2() in an attempt to maintain some call
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41 compatibility with other versions of the regex code. */
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42
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43 /* Tell the regex routines not to QUIT. Normally there is a QUIT
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44 each iteration in re_search_2(). */
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45 int no_quit_in_re_search;
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46
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47 /* Tell the regex routines which buffer to access for SYNTAX() lookups
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48 and the like. */
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49 struct buffer *regex_emacs_buffer;
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50
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51 Lisp_Object Vstandard_syntax_table;
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52
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53 Lisp_Object Vsyntax_designator_chars_string;
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54
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55 /* This is the internal form of the parse state used in parse-partial-sexp. */
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56
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57 struct lisp_parse_state
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2
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58 {
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59 int depth; /* Depth at end of parsing */
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60 Emchar instring; /* -1 if not within string, else desired terminator */
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61 int incomment; /* Nonzero if within a comment at end of parsing */
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62 int comstyle; /* comment style a=0, or b=1 */
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63 int quoted; /* Nonzero if just after an escape char at end of
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0
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64 parsing */
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2
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65 Bufpos thislevelstart;/* Char number of most recent start-of-expression
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66 at current level */
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67 Bufpos prevlevelstart;/* Char number of start of containing expression */
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68 Bufpos location; /* Char number at which parsing stopped */
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69 int mindepth; /* Minimum depth seen while scanning */
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70 Bufpos comstart; /* Position just after last comment starter */
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71 };
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0
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72
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73 /* These variables are a cache for finding the start of a defun.
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2
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74 find_start_pos is the place for which the defun start was found.
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75 find_start_value is the defun start position found for it.
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0
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76 find_start_buffer is the buffer it was found in.
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2
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77 find_start_begv is the BEGV value when it was found.
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0
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78 find_start_modiff is the value of MODIFF when it was found. */
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79
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80 static Bufpos find_start_pos;
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81 static Bufpos find_start_value;
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82 static struct buffer *find_start_buffer;
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83 static Bufpos find_start_begv;
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84 static int find_start_modiff;
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85
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86 /* Find a defun-start that is the last one before POS (or nearly the last).
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87 We record what we find, so that another call in the same area
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88 can return the same value right away. */
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89
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90 static Bufpos
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91 find_defun_start (struct buffer *buf, Bufpos pos)
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92 {
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93 Bufpos tem;
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94 Lisp_Object table = buf->syntax_table;
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95
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96 /* Use previous finding, if it's valid and applies to this inquiry. */
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97 if (buf == find_start_buffer
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98 /* Reuse the defun-start even if POS is a little farther on.
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99 POS might be in the next defun, but that's ok.
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100 Our value may not be the best possible, but will still be usable. */
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101 && pos <= find_start_pos + 1000
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102 && pos >= find_start_value
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103 && BUF_BEGV (buf) == find_start_begv
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104 && BUF_MODIFF (buf) == find_start_modiff)
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105 return find_start_value;
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106
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107 /* Back up to start of line. */
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108 tem = find_next_newline (buf, pos, -1);
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109
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110 while (tem > BUF_BEGV (buf))
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111 {
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112 /* Open-paren at start of line means we found our defun-start. */
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113 if (SYNTAX (table, BUF_FETCH_CHAR (buf, tem)) == Sopen)
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114 break;
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115 /* Move to beg of previous line. */
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116 tem = find_next_newline (buf, tem, -2);
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117 }
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118
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119 /* Record what we found, for the next try. */
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2
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120 find_start_value = tem;
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0
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121 find_start_buffer = buf;
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122 find_start_modiff = BUF_MODIFF (buf);
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2
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123 find_start_begv = BUF_BEGV (buf);
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124 find_start_pos = pos;
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0
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125
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126 return find_start_value;
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127 }
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128
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129 DEFUN ("syntax-table-p", Fsyntax_table_p, Ssyntax_table_p, 1, 1, 0 /*
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130 Return t if ARG is a syntax table.
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131 Any vector of 256 elements will do.
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132 */ )
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133 (obj)
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2
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134 Lisp_Object obj;
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0
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135 {
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136 if (VECTORP (obj) && vector_length (XVECTOR (obj)) == 0400)
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137 return Qt;
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138 return Qnil;
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139 }
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140
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141 static Lisp_Object
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142 check_syntax_table (Lisp_Object obj, Lisp_Object def)
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143 {
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144 if (NILP (obj))
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145 obj = def;
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146 while (NILP (Fsyntax_table_p (obj)))
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147 obj = wrong_type_argument (Qsyntax_table_p, obj);
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148 return (obj);
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149 }
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150
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151 DEFUN ("syntax-table", Fsyntax_table, Ssyntax_table, 0, 1, 0 /*
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152 Return the current syntax table.
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153 This is the one specified by the current buffer, or by BUFFER if it
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154 is non-nil.
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155 */ )
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156 (buffer)
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157 Lisp_Object buffer;
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158 {
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159 return decode_buffer (buffer, 0)->syntax_table;
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160 }
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161
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162 DEFUN ("standard-syntax-table", Fstandard_syntax_table,
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163 Sstandard_syntax_table, 0, 0, 0 /*
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164 Return the standard syntax table.
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165 This is the one used for new buffers.
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166 */ )
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167 ()
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168 {
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169 return Vstandard_syntax_table;
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170 }
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171
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172 DEFUN ("copy-syntax-table", Fcopy_syntax_table, Scopy_syntax_table, 0, 1, 0 /*
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173 Construct a new syntax table and return it.
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174 It is a copy of the TABLE, which defaults to the standard syntax table.
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175 */ )
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176 (table)
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177 Lisp_Object table;
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178 {
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179 if (NILP (Vstandard_syntax_table))
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180 /* Can only be null during initialization */
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181 return make_vector (0400, Qzero);
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182
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183 table = check_syntax_table (table, Vstandard_syntax_table);
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184 return Fcopy_sequence (table);
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185 }
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186
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187 DEFUN ("set-syntax-table", Fset_syntax_table, Sset_syntax_table, 1, 2, 0 /*
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188 Select a new syntax table for BUFFER.
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189 One argument, a syntax table.
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190 BUFFER defaults to the current buffer if omitted.
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191 */ )
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192 (table, buffer)
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193 Lisp_Object table, buffer;
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194 {
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195 struct buffer *buf = decode_buffer (buffer, 0);
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196 table = check_syntax_table (table, Qnil);
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197 buf->syntax_table = table;
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198 /* Indicate that this buffer now has a specified syntax table. */
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199 buf->local_var_flags |= XINT (buffer_local_flags.syntax_table);
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200 return table;
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201 }
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202
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203 /* Convert a letter which signifies a syntax code
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2
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204 into the code it signifies.
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205 This is used by modify-syntax-entry, and other things. */
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0
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206
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207 CONST unsigned char syntax_spec_code[0400] =
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208 { 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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209 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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210 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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211 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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212 (char) Swhitespace, 0377, (char) Sstring, 0377,
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213 (char) Smath, 0377, 0377, (char) Squote,
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214 (char) Sopen, (char) Sclose, 0377, 0377,
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215 0377, (char) Swhitespace, (char) Spunct, (char) Scharquote,
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216 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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217 0377, 0377, 0377, 0377,
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218 (char) Scomment, 0377, (char) Sendcomment, 0377,
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219 (char) Sinherit, 0377, 0377, 0377, 0377, 0377, 0377, 0377, /* @, A ... */
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220 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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221 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
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222 0377, 0377, 0377, 0377, (char) Sescape, 0377, 0377, (char) Ssymbol,
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223 0377, 0377, 0377, 0377, 0377, Sextword, 0377, 0377, /* `, a, ... */
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224 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377,
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225 0377, 0377, 0377, 0377, 0377, 0377, 0377, (char) Sword,
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226 0377, 0377, 0377, 0377, 0377, 0377, 0377, 0377
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227 };
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228
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229 CONST unsigned char syntax_code_spec[] =
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230 {
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231 ' ', '.', 'w', '_', '(', ')', '\'', '\"', '$', '\\', '/', '<', '>', '@',
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232 'e', '\0'
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233 };
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234
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235 DEFUN ("syntax-designator-chars", Fsyntax_designator_chars,
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236 Ssyntax_designator_chars, 0, 0, 0 /*
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237 Return a string of the recognized syntax designator chars.
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238 The chars are ordered by their internal syntax codes, which are
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239 numbered starting at 0.
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240 */ )
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241 ()
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242 {
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243 return Vsyntax_designator_chars_string;
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244 }
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245
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246 DEFUN ("char-syntax", Fchar_syntax, Schar_syntax, 1, 2, 0 /*
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247 Return the syntax code of CHAR, described by a character.
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248 For example, if CHAR is a word constituent, the character `?w' is returned.
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249 The characters that correspond to various syntax codes
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250 are listed in the documentation of `modify-syntax-entry'.
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251 Optional second argument TABLE defaults to the current buffer's
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252 syntax table.
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253 */ )
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254 (ch, table)
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2
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255 Lisp_Object ch, table;
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0
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256 {
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257 CHECK_CHAR_COERCE_INT (ch);
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258 table = check_syntax_table (table, current_buffer->syntax_table);
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259
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260 return make_int (syntax_code_spec[(int) SYNTAX (table, XINT (ch))]);
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261 }
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262
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263
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264 Lisp_Object
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265 syntax_match (Lisp_Object table, Emchar ch)
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266 {
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267 unsigned char stringterm = ((SYNTAX_CODE (table, ch) >> 8) & 0377);
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268
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269 if (stringterm == 0)
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270 return Qnil;
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271 else
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272 return make_char (stringterm);
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273 }
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274
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275 DEFUN ("matching-paren", Fmatching_paren, Smatching_paren, 1, 2, 0 /*
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276 Return the matching parenthesis of CHAR, or nil if none.
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277 Optional second argument TABLE defaults to the current buffer's
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278 syntax table.
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279 */ )
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280 (ch, table)
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281 Lisp_Object ch, table;
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282 {
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283 int code;
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284 CHECK_CHAR_COERCE_INT (ch);
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285
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286 table = check_syntax_table (table, current_buffer->syntax_table);
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287 code = SYNTAX (table, XCHAR (ch));
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288 if (code == Sopen || code == Sclose || code == Sstring)
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289 return syntax_match (table, XCHAR (ch));
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290 return Qnil;
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291 }
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292
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293
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294 /* Return the position across COUNT words from FROM.
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295 If that many words cannot be found before the end of the buffer, return 0.
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296 COUNT negative means scan backward and stop at word beginning. */
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297
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298 Bufpos
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299 scan_words (struct buffer *buf, Bufpos from, int count)
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300 {
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301 Bufpos beg = BUF_BEGV (buf);
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302 Bufpos end = BUF_ZV (buf);
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303 enum syntaxcode code;
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304 Lisp_Object table = buf->syntax_table;
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305
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306 while (count > 0)
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307 {
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308 QUIT;
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309
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310 while (1)
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311 {
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312 Emchar ch;
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313 if (from == end)
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314 {
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315 return 0;
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316 }
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317 ch = BUF_FETCH_CHAR (buf, from);
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318 code = SYNTAX_UNSAFE (table, ch);
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319 if (words_include_escapes
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320 && (code == Sescape || code == Scharquote))
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321 break;
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322 if (code == Sword || code == Sextword)
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323 break;
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324 from++;
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325 }
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326
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327 QUIT;
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328
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329 while (1)
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330 {
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331 Emchar ch;
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332 if (from == end) break;
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333 ch = BUF_FETCH_CHAR (buf, from);
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334 code = SYNTAX_UNSAFE (table, ch);
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335 if (!(words_include_escapes
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336 && (code == Sescape || code == Scharquote)))
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337 if (code != Sword && code != Sextword)
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338 break;
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339 from++;
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340 }
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341
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342 count--;
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343 }
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344 while (count < 0)
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345 {
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346 QUIT;
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347
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348 while (1)
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349 {
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350 Emchar ch;
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351 if (from == beg)
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352 {
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353 return 0;
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354 }
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355 ch = BUF_FETCH_CHAR (buf, from - 1);
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356 code = SYNTAX_UNSAFE (table, ch);
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357 if (words_include_escapes
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358 && (code == Sescape || code == Scharquote))
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359 break;
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360 if (code == Sword || code == Sextword)
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361 break;
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362 from--;
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363 }
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364
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365 QUIT;
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366
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367 while (1)
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368 {
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369 Emchar ch;
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370 if (from == beg) break;
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371 ch = BUF_FETCH_CHAR (buf, from - 1);
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372 code = SYNTAX_UNSAFE (table, ch);
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373 if (!(words_include_escapes
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374 && (code == Sescape || code == Scharquote)))
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375 if (code != Sword && code != Sextword)
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376 break;
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377 from--;
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378 }
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379 count++;
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380 }
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381
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382 return from;
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383 }
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384
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385 DEFUN ("forward-word", Fforward_word, Sforward_word, 1, 2, "_p" /*
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386 Move point forward ARG words (backward if ARG is negative).
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387 Normally returns t.
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388 If an edge of the buffer is reached, point is left there
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389 and nil is returned.
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390 */ )
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391 (count, buffer)
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2
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392 Lisp_Object count, buffer;
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0
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393 {
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394 Bufpos val;
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395 struct buffer *buf = decode_buffer (buffer, 0);
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396 CHECK_INT (count);
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397
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398 if (!(val = scan_words (buf, BUF_PT (buf), XINT (count))))
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399 {
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|
|
400 BUF_SET_PT (buf, XINT (count) > 0 ? BUF_ZV (buf) : BUF_BEGV (buf));
|
|
|
401 return Qnil;
|
|
|
402 }
|
|
|
403 BUF_SET_PT (buf, val);
|
|
|
404 return Qt;
|
|
|
405 }
|
|
|
406
|
|
|
407 static void scan_sexps_forward (struct buffer *buf,
|
|
|
408 struct lisp_parse_state *,
|
|
|
409 Bufpos from, Bufpos end,
|
|
|
410 int targetdepth, int stopbefore,
|
|
|
411 Lisp_Object oldstate,
|
|
|
412 int commentstop);
|
|
|
413
|
|
|
414 static int
|
|
|
415 find_start_of_comment (struct buffer *buf, Bufpos from, Bufpos stop, int mask)
|
|
|
416 {
|
|
|
417 Emchar c;
|
|
|
418 enum syntaxcode code;
|
|
|
419 Lisp_Object table = buf->syntax_table;
|
|
|
420
|
|
|
421 /* Look back, counting the parity of string-quotes,
|
|
|
422 and recording the comment-starters seen.
|
|
|
423 When we reach a safe place, assume that's not in a string;
|
|
|
424 then step the main scan to the earliest comment-starter seen
|
|
|
425 an even number of string quotes away from the safe place.
|
|
|
426
|
|
|
427 OFROM[I] is position of the earliest comment-starter seen
|
|
|
428 which is I+2X quotes from the comment-end.
|
|
|
429 PARITY is current parity of quotes from the comment end. */
|
|
|
430 int parity = 0;
|
|
|
431 Emchar my_stringend = 0;
|
|
|
432 int string_lossage = 0;
|
|
|
433 Bufpos comment_end = from;
|
|
|
434 Bufpos comstart_pos = 0;
|
|
|
435 int comstart_parity = 0;
|
|
|
436 int styles_match_p = 0;
|
|
|
437
|
|
|
438 /* At beginning of range to scan, we're outside of strings;
|
|
|
439 that determines quote parity to the comment-end. */
|
|
|
440 while (from != stop)
|
|
|
441 {
|
|
|
442 /* Move back and examine a character. */
|
|
|
443 from--;
|
|
|
444
|
|
|
445 c = BUF_FETCH_CHAR (buf, from);
|
|
|
446 code = SYNTAX_UNSAFE (table, c);
|
|
|
447
|
|
|
448 /* is this a 1-char comment end sequence? if so, try
|
|
|
449 to see if style matches previously extracted mask */
|
|
|
450 if (code == Sendcomment)
|
|
|
451 {
|
|
|
452 styles_match_p = SYNTAX_STYLES_MATCH_1CHAR_P (table, c, mask);
|
|
|
453 }
|
|
|
454
|
|
|
455 /* otherwise, is this a 2-char comment end sequence? */
|
|
|
456 else if (from >= stop
|
|
|
457 && SYNTAX_END_P (table, c, BUF_FETCH_CHAR (buf, from+1)))
|
|
|
458 {
|
|
|
459 code = Sendcomment;
|
|
|
460 styles_match_p =
|
|
|
461 SYNTAX_STYLES_MATCH_END_P (table, c,
|
|
|
462 BUF_FETCH_CHAR (buf, from+1),
|
|
|
463 mask);
|
|
|
464 }
|
|
|
465
|
|
|
466 /* or are we looking at a 1-char comment start sequence
|
|
|
467 of the style matching mask? */
|
|
|
468 else if (code == Scomment
|
|
|
469 && SYNTAX_STYLES_MATCH_1CHAR_P (table, c, mask))
|
|
|
470 {
|
|
|
471 styles_match_p = 1;
|
|
|
472 }
|
|
|
473
|
|
|
474 /* or possibly, a 2-char comment start sequence */
|
|
|
475 else if (from >= stop
|
|
|
476 && SYNTAX_STYLES_MATCH_START_P (table, c,
|
|
|
477 BUF_FETCH_CHAR (buf, from+1),
|
|
|
478 mask))
|
|
|
479 {
|
|
|
480 code = Scomment;
|
|
|
481 styles_match_p = 1;
|
|
|
482 }
|
|
|
483
|
|
|
484 /* Ignore escaped characters. */
|
|
|
485 if (char_quoted (buf, from))
|
|
|
486 continue;
|
|
|
487
|
|
|
488 /* Track parity of quotes. */
|
|
|
489 if (code == Sstring)
|
|
|
490 {
|
|
|
491 parity ^= 1;
|
|
|
492 if (my_stringend == 0)
|
|
|
493 my_stringend = c;
|
|
|
494 /* If we have two kinds of string delimiters.
|
|
|
495 There's no way to grok this scanning backwards. */
|
|
|
496 else if (my_stringend != c)
|
|
|
497 string_lossage = 1;
|
|
|
498 }
|
|
|
499
|
|
|
500 /* Record comment-starters according to that
|
|
|
501 quote-parity to the comment-end. */
|
|
|
502 if (code == Scomment && styles_match_p)
|
|
|
503 {
|
|
|
504 comstart_parity = parity;
|
|
|
505 comstart_pos = from;
|
|
|
506 }
|
|
|
507
|
|
|
508 /* If we find another earlier comment-ender,
|
|
|
509 any comment-starts earlier than that don't count
|
|
|
510 (because they go with the earlier comment-ender). */
|
|
|
511 if (code == Sendcomment && styles_match_p)
|
|
|
512 break;
|
|
|
513
|
|
|
514 /* Assume a defun-start point is outside of strings. */
|
|
|
515 if (code == Sopen
|
|
|
516 && (from == stop || BUF_FETCH_CHAR (buf, from - 1) == '\n'))
|
|
|
517 break;
|
|
|
518 }
|
|
|
519
|
|
|
520 if (comstart_pos == 0)
|
|
|
521 from = comment_end;
|
|
|
522 /* If the earliest comment starter
|
|
|
523 is followed by uniform paired string quotes or none,
|
|
|
524 we know it can't be inside a string
|
|
|
525 since if it were then the comment ender would be inside one.
|
|
|
526 So it does start a comment. Skip back to it. */
|
|
|
527 else if (comstart_parity == 0 && !string_lossage)
|
|
|
528 from = comstart_pos;
|
|
|
529 else
|
|
|
530 {
|
|
|
531 /* We had two kinds of string delimiters mixed up
|
|
|
532 together. Decode this going forwards.
|
|
|
533 Scan fwd from the previous comment ender
|
|
|
534 to the one in question; this records where we
|
|
|
535 last passed a comment starter. */
|
|
|
536
|
|
|
537 struct lisp_parse_state state;
|
|
|
538 scan_sexps_forward (buf, &state, find_defun_start (buf, comment_end),
|
|
|
539 comment_end - 1, -10000, 0, Qnil, 0);
|
|
|
540 if (state.incomment)
|
|
|
541 from = state.comstart;
|
|
|
542 else
|
|
|
543 /* We can't grok this as a comment; scan it normally. */
|
|
|
544 from = comment_end;
|
|
|
545 }
|
|
|
546 return from;
|
|
|
547 }
|
|
|
548
|
|
|
549 static Bufpos
|
|
|
550 find_end_of_comment (struct buffer *buf, Bufpos from, Bufpos stop, int mask)
|
|
|
551 {
|
|
|
552 int c;
|
|
|
553 Lisp_Object table = buf->syntax_table;
|
|
|
554
|
|
|
555 while (1)
|
|
|
556 {
|
|
|
557 if (from == stop)
|
|
|
558 {
|
|
|
559 return -1;
|
|
|
560 }
|
|
|
561 c = BUF_FETCH_CHAR (buf, from);
|
|
|
562 if (SYNTAX_UNSAFE (table, c) == Sendcomment
|
|
|
563 && SYNTAX_STYLES_MATCH_1CHAR_P (table, c, mask))
|
|
|
564 /* we have encountered a comment end of the same style
|
|
|
565 as the comment sequence which began this comment
|
|
|
566 section */
|
|
|
567 break;
|
|
|
568
|
|
|
569 from++;
|
|
|
570 if (from < stop
|
|
|
571 && SYNTAX_STYLES_MATCH_END_P (table, c,
|
|
|
572 BUF_FETCH_CHAR (buf, from), mask))
|
|
|
573 /* we have encountered a comment end of the same style
|
|
|
574 as the comment sequence which began this comment
|
|
|
575 section */
|
|
|
576 { from++; break; }
|
|
|
577 }
|
|
|
578 return from;
|
|
|
579 }
|
|
|
580
|
|
|
581
|
|
|
582 /* #### between FSF 19.23 and 19.28 there are some changes to the logic
|
|
|
583 in this function (and minor changes to find_start_of_comment(),
|
|
|
584 above, which is part of Fforward_comment() in FSF). Attempts to port
|
|
|
585 that logic made this function break, so I'm leaving it out. If anyone
|
|
|
586 ever complains about this function not working properly, take a look
|
|
|
587 at those changes. --ben */
|
|
|
588
|
|
|
589 DEFUN ("forward-comment", Fforward_comment, Sforward_comment, 1, 2, 0 /*
|
|
|
590 Move forward across up to N comments. If N is negative, move backward.
|
|
|
591 Stop scanning if we find something other than a comment or whitespace.
|
|
|
592 Set point to where scanning stops.
|
|
|
593 If N comments are found as expected, with nothing except whitespace
|
|
|
594 between them, return t; otherwise return nil.
|
|
|
595 Point is set in either case.
|
|
|
596 Optional argument BUFFER defaults to the current buffer.
|
|
|
597 */ )
|
|
2
|
598 (n, buffer)
|
|
|
599 Lisp_Object n, buffer;
|
|
0
|
600 {
|
|
|
601 Bufpos from;
|
|
|
602 Bufpos stop;
|
|
|
603 Emchar c;
|
|
|
604 enum syntaxcode code;
|
|
|
605 int count;
|
|
|
606 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
607 Lisp_Object table = buf->syntax_table;
|
|
|
608
|
|
|
609 CHECK_INT (n);
|
|
|
610 count = XINT (n);
|
|
|
611
|
|
|
612 from = BUF_PT (buf);
|
|
|
613
|
|
|
614 while (count > 0)
|
|
|
615 {
|
|
|
616 QUIT;
|
|
|
617
|
|
|
618 stop = BUF_ZV (buf);
|
|
|
619 while (from < stop)
|
|
|
620 {
|
|
|
621 int mask = 0; /* mask for finding matching comment style */
|
|
|
622
|
|
|
623 if (char_quoted (buf, from))
|
|
|
624 {
|
|
|
625 from++;
|
|
|
626 continue;
|
|
|
627 }
|
|
|
628
|
|
|
629 c = BUF_FETCH_CHAR (buf, from);
|
|
|
630 code = SYNTAX (table, c);
|
|
|
631
|
|
|
632 if (code == Scomment)
|
|
|
633 {
|
|
|
634 /* we have encountered a single character comment start
|
|
|
635 sequence, and we are ignoring all text inside comments.
|
|
|
636 we must record the comment style this character begins
|
|
|
637 so that later, only a comment end of the same style actually
|
|
|
638 ends the comment section */
|
|
|
639 mask = SYNTAX_COMMENT_1CHAR_MASK (table, c);
|
|
|
640 }
|
|
|
641
|
|
|
642 else if (from < stop
|
|
|
643 && SYNTAX_START_P (table, c, BUF_FETCH_CHAR (buf, from+1)))
|
|
|
644 {
|
|
|
645 /* we have encountered a 2char comment start sequence and we
|
|
|
646 are ignoring all text inside comments. we must record
|
|
|
647 the comment style this sequence begins so that later,
|
|
|
648 only a comment end of the same style actually ends
|
|
|
649 the comment section */
|
|
|
650 code = Scomment;
|
|
|
651 mask = SYNTAX_COMMENT_MASK_START (table, c,
|
|
|
652 BUF_FETCH_CHAR (buf, from+1));
|
|
|
653 from++;
|
|
|
654 }
|
|
|
655
|
|
|
656 if (code == Scomment)
|
|
|
657 {
|
|
|
658 Bufpos newfrom;
|
|
|
659
|
|
|
660 newfrom = find_end_of_comment (buf, from, stop, mask);
|
|
|
661 if (newfrom < 0)
|
|
|
662 {
|
|
|
663 /* we stopped because from==stop */
|
|
|
664 BUF_SET_PT (buf, stop);
|
|
|
665 return Qnil;
|
|
|
666 }
|
|
|
667 from = newfrom;
|
|
|
668
|
|
|
669 /* We have skipped one comment. */
|
|
|
670 break;
|
|
|
671 }
|
|
|
672 else if (code != Swhitespace
|
|
|
673 && code != Sendcomment
|
|
|
674 && code != Scomment )
|
|
|
675 {
|
|
|
676 BUF_SET_PT (buf, from);
|
|
|
677 return Qnil;
|
|
|
678 }
|
|
|
679 from++;
|
|
|
680 }
|
|
|
681
|
|
|
682 /* End of comment reached */
|
|
|
683 count--;
|
|
|
684 }
|
|
|
685
|
|
|
686 while (count < 0)
|
|
|
687 {
|
|
|
688 QUIT;
|
|
|
689
|
|
|
690 stop = BUF_BEGV (buf);
|
|
|
691 while (from > stop)
|
|
|
692 {
|
|
|
693 int mask = 0; /* mask for finding matching comment style */
|
|
|
694
|
|
|
695 from--;
|
|
|
696 if (char_quoted (buf, from))
|
|
|
697 {
|
|
|
698 from--;
|
|
|
699 continue;
|
|
|
700 }
|
|
|
701
|
|
|
702 c = BUF_FETCH_CHAR (buf, from);
|
|
|
703 code = SYNTAX (table, c);
|
|
|
704
|
|
|
705 if (code == Sendcomment)
|
|
|
706 {
|
|
|
707 /* we have found a single char end comment. we must record
|
|
|
708 the comment style encountered so that later, we can match
|
|
|
709 only the proper comment begin sequence of the same style */
|
|
|
710 mask = SYNTAX_COMMENT_1CHAR_MASK (table, c);
|
|
|
711 }
|
|
|
712
|
|
|
713 else if (from > stop
|
|
|
714 && SYNTAX_END_P (table, BUF_FETCH_CHAR (buf, from - 1), c)
|
|
|
715 && !char_quoted (buf, from - 1))
|
|
|
716 {
|
|
|
717 /* We must record the comment style encountered so that
|
|
|
718 later, we can match only the proper comment begin
|
|
|
719 sequence of the same style. */
|
|
|
720 code = Sendcomment;
|
|
|
721 mask = SYNTAX_COMMENT_MASK_END (table,
|
|
|
722 BUF_FETCH_CHAR (buf, from - 1),
|
|
|
723 c);
|
|
|
724 from--;
|
|
|
725 }
|
|
|
726
|
|
|
727 if (code == Sendcomment)
|
|
|
728 {
|
|
|
729 from = find_start_of_comment (buf, from, stop, mask);
|
|
|
730 break;
|
|
|
731 }
|
|
|
732
|
|
|
733 else if (code != Swhitespace
|
|
|
734 && SYNTAX (table, c) != Scomment
|
|
|
735 && SYNTAX (table, c) != Sendcomment)
|
|
|
736 {
|
|
|
737 BUF_SET_PT (buf, from + 1);
|
|
|
738 return Qnil;
|
|
|
739 }
|
|
|
740 }
|
|
|
741
|
|
|
742 count++;
|
|
|
743 }
|
|
|
744
|
|
|
745 BUF_SET_PT (buf, from);
|
|
|
746 return Qt;
|
|
|
747 }
|
|
|
748
|
|
|
749
|
|
|
750 Lisp_Object
|
|
|
751 scan_lists (struct buffer *buf, Bufpos from, int count, int depth,
|
|
|
752 int sexpflag, int no_error)
|
|
|
753 {
|
|
|
754 Bufpos stop;
|
|
|
755 Emchar c;
|
|
|
756 int quoted;
|
|
|
757 int mathexit = 0;
|
|
|
758 enum syntaxcode code;
|
|
|
759 int min_depth = depth; /* Err out if depth gets less than this. */
|
|
|
760 Lisp_Object table = buf->syntax_table;
|
|
|
761
|
|
|
762 if (depth > 0) min_depth = 0;
|
|
|
763
|
|
|
764 while (count > 0)
|
|
|
765 {
|
|
|
766 QUIT;
|
|
|
767
|
|
|
768 stop = BUF_ZV (buf);
|
|
|
769 while (from < stop)
|
|
|
770 {
|
|
|
771 int mask = 0; /* mask for finding matching comment style */
|
|
|
772
|
|
|
773 c = BUF_FETCH_CHAR (buf, from);
|
|
|
774 code = SYNTAX_UNSAFE (table, c);
|
|
|
775 from++;
|
|
|
776
|
|
|
777 /* a 1-char comment start sequence */
|
|
|
778 if (code == Scomment && parse_sexp_ignore_comments)
|
|
|
779 {
|
|
|
780 mask = SYNTAX_COMMENT_1CHAR_MASK (table, c);
|
|
|
781 }
|
|
|
782
|
|
|
783 /* else, a 2-char comment start sequence? */
|
|
|
784 else if (from < stop
|
|
|
785 && SYNTAX_START_P (table, c, BUF_FETCH_CHAR (buf, from))
|
|
|
786 && parse_sexp_ignore_comments)
|
|
|
787 {
|
|
|
788 /* we have encountered a comment start sequence and we
|
|
|
789 are ignoring all text inside comments. we must record
|
|
|
790 the comment style this sequence begins so that later,
|
|
|
791 only a comment end of the same style actually ends
|
|
|
792 the comment section */
|
|
|
793 code = Scomment;
|
|
|
794 mask = SYNTAX_COMMENT_MASK_START (table, c,
|
|
|
795 BUF_FETCH_CHAR (buf, from));
|
|
|
796 from++;
|
|
|
797 }
|
|
|
798
|
|
|
799 if (SYNTAX_PREFIX_UNSAFE (table, c))
|
|
|
800 continue;
|
|
|
801
|
|
|
802 switch (code)
|
|
|
803 {
|
|
|
804 case Sescape:
|
|
|
805 case Scharquote:
|
|
|
806 if (from == stop) goto lose;
|
|
|
807 from++;
|
|
|
808 /* treat following character as a word constituent */
|
|
|
809 case Sword:
|
|
|
810 case Sextword:
|
|
|
811 case Ssymbol:
|
|
|
812 if (depth || !sexpflag) break;
|
|
|
813 /* This word counts as a sexp; return at end of it. */
|
|
|
814 while (from < stop)
|
|
|
815 {
|
|
|
816 switch (SYNTAX (table, BUF_FETCH_CHAR (buf, from)))
|
|
|
817 {
|
|
|
818 case Scharquote:
|
|
|
819 case Sescape:
|
|
|
820 from++;
|
|
|
821 if (from == stop) goto lose;
|
|
|
822 break;
|
|
|
823 case Sword:
|
|
|
824 case Sextword:
|
|
|
825 case Ssymbol:
|
|
|
826 case Squote:
|
|
|
827 break;
|
|
|
828 default:
|
|
|
829 goto done;
|
|
|
830 }
|
|
|
831 from++;
|
|
|
832 }
|
|
|
833 goto done;
|
|
|
834
|
|
|
835 case Scomment:
|
|
|
836 if (!parse_sexp_ignore_comments)
|
|
|
837 break;
|
|
|
838 {
|
|
|
839 Bufpos newfrom = find_end_of_comment (buf, from, stop, mask);
|
|
|
840 if (newfrom < 0)
|
|
|
841 {
|
|
|
842 /* we stopped because from == stop in search forward */
|
|
|
843 from = stop;
|
|
|
844 if (depth == 0)
|
|
|
845 goto done;
|
|
|
846 goto lose;
|
|
|
847 }
|
|
|
848 from = newfrom;
|
|
|
849 }
|
|
|
850 break;
|
|
|
851
|
|
|
852 case Smath:
|
|
|
853 if (!sexpflag)
|
|
|
854 break;
|
|
|
855 if (from != stop && c == BUF_FETCH_CHAR (buf, from))
|
|
|
856 from++;
|
|
|
857 if (mathexit)
|
|
|
858 {
|
|
|
859 mathexit = 0;
|
|
|
860 goto close1;
|
|
|
861 }
|
|
|
862 mathexit = 1;
|
|
|
863
|
|
|
864 case Sopen:
|
|
|
865 if (!++depth) goto done;
|
|
|
866 break;
|
|
|
867
|
|
|
868 case Sclose:
|
|
|
869 close1:
|
|
|
870 if (!--depth) goto done;
|
|
|
871 if (depth < min_depth)
|
|
|
872 {
|
|
|
873 if (no_error)
|
|
|
874 return Qnil;
|
|
|
875 error ("Containing expression ends prematurely");
|
|
|
876 }
|
|
|
877 break;
|
|
|
878
|
|
|
879 case Sstring:
|
|
|
880 {
|
|
|
881 /* XEmacs change: call syntax_match on character */
|
|
|
882 Emchar ch = BUF_FETCH_CHAR (buf, from - 1);
|
|
|
883 Lisp_Object stermobj = syntax_match (table, ch);
|
|
|
884 Emchar stringterm;
|
|
|
885
|
|
|
886 if (CHARP (stermobj))
|
|
|
887 stringterm = XCHAR (stermobj);
|
|
|
888 else
|
|
|
889 stringterm = ch;
|
|
|
890
|
|
|
891 while (1)
|
|
|
892 {
|
|
|
893 if (from >= stop)
|
|
|
894 goto lose;
|
|
|
895 if (BUF_FETCH_CHAR (buf, from) == stringterm)
|
|
|
896 break;
|
|
|
897 switch (SYNTAX (table, BUF_FETCH_CHAR (buf, from)))
|
|
|
898 {
|
|
|
899 case Scharquote:
|
|
|
900 case Sescape:
|
|
|
901 from++;
|
|
|
902 break;
|
|
|
903 default:
|
|
|
904 break;
|
|
|
905 }
|
|
|
906 from++;
|
|
|
907 }
|
|
|
908 from++;
|
|
|
909 if (!depth && sexpflag) goto done;
|
|
|
910 break;
|
|
|
911 }
|
|
|
912
|
|
|
913 default:
|
|
|
914 break;
|
|
|
915 }
|
|
|
916 }
|
|
|
917
|
|
|
918 /* Reached end of buffer. Error if within object,
|
|
|
919 return nil if between */
|
|
|
920 if (depth) goto lose;
|
|
|
921
|
|
|
922 return Qnil;
|
|
|
923
|
|
|
924 /* End of object reached */
|
|
|
925 done:
|
|
|
926 count--;
|
|
|
927 }
|
|
|
928
|
|
|
929 while (count < 0)
|
|
|
930 {
|
|
|
931 QUIT;
|
|
|
932
|
|
|
933 stop = BUF_BEGV (buf);
|
|
|
934 while (from > stop)
|
|
|
935 {
|
|
|
936 int mask = 0; /* mask for finding matching comment style */
|
|
|
937
|
|
|
938 from--;
|
|
|
939 quoted = char_quoted (buf, from);
|
|
|
940 if (quoted)
|
|
|
941 from--;
|
|
|
942
|
|
|
943 c = BUF_FETCH_CHAR (buf, from);
|
|
|
944 code = SYNTAX_UNSAFE (table, c);
|
|
|
945
|
|
|
946 if (code == Sendcomment && parse_sexp_ignore_comments)
|
|
|
947 {
|
|
|
948 /* we have found a single char end comment. we must record
|
|
|
949 the comment style encountered so that later, we can match
|
|
|
950 only the proper comment begin sequence of the same style */
|
|
|
951 mask = SYNTAX_COMMENT_1CHAR_MASK (table, c);
|
|
|
952 }
|
|
|
953
|
|
|
954 else if (from > stop
|
|
|
955 && SYNTAX_END_P (table, BUF_FETCH_CHAR (buf, from-1), c)
|
|
|
956 && !char_quoted (buf, from - 1)
|
|
|
957 && parse_sexp_ignore_comments)
|
|
|
958 {
|
|
|
959 /* we must record the comment style encountered so that
|
|
|
960 later, we can match only the proper comment begin
|
|
|
961 sequence of the same style */
|
|
|
962 code = Sendcomment;
|
|
|
963 mask = SYNTAX_COMMENT_MASK_END (table,
|
|
|
964 BUF_FETCH_CHAR (buf, from - 1),
|
|
|
965 c);
|
|
|
966 from--;
|
|
|
967 }
|
|
|
968
|
|
|
969 if (SYNTAX_PREFIX_UNSAFE (table, c))
|
|
|
970 continue;
|
|
|
971
|
|
|
972 switch (((quoted) ? Sword : code))
|
|
|
973 {
|
|
|
974 case Sword:
|
|
|
975 case Sextword:
|
|
|
976 case Ssymbol:
|
|
|
977 if (depth || !sexpflag) break;
|
|
|
978 /* This word counts as a sexp; count object finished after
|
|
|
979 passing it. */
|
|
|
980 while (from > stop)
|
|
|
981 {
|
|
|
982 enum syntaxcode syncode;
|
|
|
983 quoted = char_quoted (buf, from - 1);
|
|
|
984
|
|
|
985 if (quoted)
|
|
|
986 from--;
|
|
|
987 if (! (quoted
|
|
|
988 || (syncode =
|
|
|
989 SYNTAX (table, BUF_FETCH_CHAR (buf, from - 1)))
|
|
|
990 == Sword
|
|
|
991 || syncode == Sextword
|
|
|
992 || syncode == Ssymbol
|
|
|
993 || syncode == Squote))
|
|
|
994 goto done2;
|
|
|
995 from--;
|
|
|
996 }
|
|
|
997 goto done2;
|
|
|
998
|
|
|
999 case Smath:
|
|
|
1000 if (!sexpflag)
|
|
|
1001 break;
|
|
|
1002 if (from != stop && c == BUF_FETCH_CHAR (buf, from - 1))
|
|
|
1003 from--;
|
|
|
1004 if (mathexit)
|
|
|
1005 {
|
|
|
1006 mathexit = 0;
|
|
|
1007 goto open2;
|
|
|
1008 }
|
|
|
1009 mathexit = 1;
|
|
|
1010
|
|
|
1011 case Sclose:
|
|
|
1012 if (!++depth) goto done2;
|
|
|
1013 break;
|
|
|
1014
|
|
|
1015 case Sopen:
|
|
|
1016 open2:
|
|
|
1017 if (!--depth) goto done2;
|
|
|
1018 if (depth < min_depth)
|
|
|
1019 {
|
|
|
1020 if (no_error)
|
|
|
1021 return Qnil;
|
|
|
1022 error ("Containing expression ends prematurely");
|
|
|
1023 }
|
|
|
1024 break;
|
|
|
1025
|
|
|
1026 case Sendcomment:
|
|
|
1027 if (parse_sexp_ignore_comments)
|
|
|
1028 from = find_start_of_comment (buf, from, stop, mask);
|
|
|
1029 break;
|
|
|
1030
|
|
|
1031 case Sstring:
|
|
|
1032 {
|
|
|
1033 /* XEmacs change: call syntax_match() on character */
|
|
|
1034 Emchar ch = BUF_FETCH_CHAR (buf, from);
|
|
|
1035 Lisp_Object stermobj = syntax_match (table, ch);
|
|
|
1036 Emchar stringterm;
|
|
|
1037
|
|
|
1038 if (CHARP (stermobj))
|
|
|
1039 stringterm = XCHAR (stermobj);
|
|
|
1040 else
|
|
|
1041 stringterm = ch;
|
|
|
1042
|
|
|
1043 while (1)
|
|
|
1044 {
|
|
|
1045 if (from == stop) goto lose;
|
|
|
1046 if (!char_quoted (buf, from - 1)
|
|
|
1047 && stringterm == BUF_FETCH_CHAR (buf, from - 1))
|
|
|
1048 break;
|
|
|
1049 from--;
|
|
|
1050 }
|
|
|
1051 from--;
|
|
|
1052 if (!depth && sexpflag) goto done2;
|
|
|
1053 break;
|
|
|
1054 }
|
|
|
1055 }
|
|
|
1056 }
|
|
|
1057
|
|
|
1058 /* Reached start of buffer. Error if within object,
|
|
|
1059 return nil if between */
|
|
|
1060 if (depth) goto lose;
|
|
|
1061
|
|
|
1062 return Qnil;
|
|
|
1063
|
|
|
1064 done2:
|
|
|
1065 count++;
|
|
|
1066 }
|
|
|
1067
|
|
|
1068
|
|
|
1069 return (make_int (from));
|
|
|
1070
|
|
|
1071 lose:
|
|
|
1072 if (!no_error)
|
|
|
1073 error ("Unbalanced parentheses");
|
|
|
1074 return Qnil;
|
|
|
1075 }
|
|
|
1076
|
|
|
1077 int
|
|
|
1078 char_quoted (struct buffer *buf, Bufpos pos)
|
|
|
1079 {
|
|
|
1080 enum syntaxcode code;
|
|
|
1081 Bufpos beg = BUF_BEGV (buf);
|
|
|
1082 int quoted = 0;
|
|
|
1083 Lisp_Object table = buf->syntax_table;
|
|
|
1084
|
|
|
1085 while (pos > beg
|
|
|
1086 && ((code = SYNTAX (table, BUF_FETCH_CHAR (buf, pos - 1)))
|
|
|
1087 == Scharquote
|
|
|
1088 || code == Sescape))
|
|
|
1089 pos--, quoted = !quoted;
|
|
|
1090 return quoted;
|
|
|
1091 }
|
|
|
1092
|
|
|
1093 DEFUN ("scan-lists", Fscan_lists, Sscan_lists, 3, 5, 0 /*
|
|
|
1094 Scan from character number FROM by COUNT lists.
|
|
|
1095 Returns the character number of the position thus found.
|
|
|
1096
|
|
|
1097 If DEPTH is nonzero, paren depth begins counting from that value,
|
|
|
1098 only places where the depth in parentheses becomes zero
|
|
|
1099 are candidates for stopping; COUNT such places are counted.
|
|
|
1100 Thus, a positive value for DEPTH means go out levels.
|
|
|
1101
|
|
|
1102 Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
|
|
|
1103
|
|
|
1104 If the beginning or end of (the accessible part of) the buffer is reached
|
|
|
1105 and the depth is wrong, an error is signaled.
|
|
|
1106 If the depth is right but the count is not used up, nil is returned.
|
|
|
1107
|
|
|
1108 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
|
|
|
1109 of in the current buffer.
|
|
|
1110
|
|
|
1111 If optional arg NOERROR is non-nil, scan-lists will return nil instead of
|
|
|
1112 signalling an error.
|
|
|
1113 */ )
|
|
|
1114 (from, count, depth, buffer, no_error)
|
|
|
1115 Lisp_Object from, count, depth, buffer, no_error;
|
|
|
1116 {
|
|
|
1117 struct buffer *buf;
|
|
|
1118
|
|
|
1119 CHECK_INT (from);
|
|
|
1120 CHECK_INT (count);
|
|
|
1121 CHECK_INT (depth);
|
|
|
1122 buf = decode_buffer (buffer, 0);
|
|
|
1123
|
|
|
1124 return scan_lists (buf, XINT (from), XINT (count), XINT (depth), 0,
|
|
|
1125 !NILP (no_error));
|
|
|
1126 }
|
|
|
1127
|
|
|
1128 DEFUN ("scan-sexps", Fscan_sexps, Sscan_sexps, 2, 4, 0 /*
|
|
|
1129 Scan from character number FROM by COUNT balanced expressions.
|
|
|
1130 If COUNT is negative, scan backwards.
|
|
|
1131 Returns the character number of the position thus found.
|
|
|
1132
|
|
|
1133 Comments are ignored if `parse-sexp-ignore-comments' is non-nil.
|
|
|
1134
|
|
|
1135 If the beginning or end of (the accessible part of) the buffer is reached
|
|
|
1136 in the middle of a parenthetical grouping, an error is signaled.
|
|
|
1137 If the beginning or end is reached between groupings
|
|
|
1138 but before count is used up, nil is returned.
|
|
|
1139
|
|
|
1140 If optional arg BUFFER is non-nil, scanning occurs in that buffer instead
|
|
|
1141 of in the current buffer.
|
|
|
1142
|
|
|
1143 If optional arg NOERROR is non-nil, scan-sexps will return nil instead of
|
|
|
1144 signalling an error.
|
|
|
1145 */ )
|
|
|
1146 (from, count, buffer, no_error)
|
|
|
1147 Lisp_Object from, count, buffer, no_error;
|
|
|
1148 {
|
|
|
1149 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
1150 CHECK_INT (from);
|
|
|
1151 CHECK_INT (count);
|
|
|
1152
|
|
|
1153 return scan_lists (buf, XINT (from), XINT (count), 0, 1, !NILP (no_error));
|
|
|
1154 }
|
|
|
1155
|
|
|
1156 DEFUN ("backward-prefix-chars", Fbackward_prefix_chars, Sbackward_prefix_chars,
|
|
|
1157 0, 1, 0 /*
|
|
|
1158 Move point backward over any number of chars with prefix syntax.
|
|
|
1159 This includes chars with \"quote\" or \"prefix\" syntax (' or p).
|
|
|
1160
|
|
|
1161 Optional arg BUFFER defaults to the current buffer.
|
|
|
1162 */ )
|
|
|
1163 (buffer)
|
|
|
1164 Lisp_Object buffer;
|
|
|
1165 {
|
|
|
1166 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
1167 Bufpos beg = BUF_BEGV (buf);
|
|
|
1168 Bufpos pos = BUF_PT (buf);
|
|
|
1169 Lisp_Object table = buf->syntax_table;
|
|
|
1170
|
|
|
1171 while (pos > beg && !char_quoted (buf, pos - 1)
|
|
|
1172 && (SYNTAX (table, BUF_FETCH_CHAR (buf, pos - 1)) == Squote
|
|
|
1173 || SYNTAX_PREFIX (table, BUF_FETCH_CHAR (buf, pos - 1))))
|
|
|
1174 pos--;
|
|
|
1175
|
|
|
1176 BUF_SET_PT (buf, pos);
|
|
|
1177
|
|
|
1178 return Qnil;
|
|
|
1179 }
|
|
|
1180
|
|
|
1181 /* Parse forward from FROM to END,
|
|
|
1182 assuming that FROM has state OLDSTATE (nil means FROM is start of function),
|
|
|
1183 and return a description of the state of the parse at END.
|
|
|
1184 If STOPBEFORE is nonzero, stop at the start of an atom.
|
|
|
1185 If COMMENTSTOP is nonzero, stop at the start of a comment. */
|
|
|
1186
|
|
|
1187 static void
|
|
|
1188 scan_sexps_forward (struct buffer *buf, struct lisp_parse_state *stateptr,
|
|
|
1189 Bufpos from, Bufpos end,
|
|
|
1190 int targetdepth, int stopbefore,
|
|
|
1191 Lisp_Object oldstate,
|
|
|
1192 int commentstop)
|
|
|
1193 {
|
|
|
1194 struct lisp_parse_state state;
|
|
|
1195
|
|
|
1196 enum syntaxcode code;
|
|
|
1197 struct level { int last, prev; };
|
|
|
1198 struct level levelstart[100];
|
|
|
1199 struct level *curlevel = levelstart;
|
|
|
1200 struct level *endlevel = levelstart + 100;
|
|
|
1201 int depth; /* Paren depth of current scanning location.
|
|
|
1202 level - levelstart equals this except
|
|
|
1203 when the depth becomes negative. */
|
|
|
1204 int mindepth; /* Lowest DEPTH value seen. */
|
|
|
1205 int start_quoted = 0; /* Nonzero means starting after a char quote */
|
|
|
1206 Lisp_Object table = buf->syntax_table;
|
|
|
1207 Lisp_Object tem;
|
|
|
1208 int mask; /* comment mask */
|
|
|
1209
|
|
|
1210 if (NILP (oldstate))
|
|
|
1211 {
|
|
|
1212 depth = 0;
|
|
|
1213 state.instring = -1;
|
|
|
1214 state.incomment = 0;
|
|
|
1215 state.comstyle = 0; /* comment style a by default */
|
|
|
1216 mask = SYNTAX_COMMENT_STYLE_A;
|
|
|
1217 }
|
|
|
1218 else
|
|
|
1219 {
|
|
|
1220 tem = Fcar (oldstate); /* elt 0, depth */
|
|
|
1221 if (!NILP (tem))
|
|
|
1222 depth = XINT (tem);
|
|
|
1223 else
|
|
|
1224 depth = 0;
|
|
|
1225
|
|
|
1226 oldstate = Fcdr (oldstate);
|
|
|
1227 oldstate = Fcdr (oldstate);
|
|
|
1228 oldstate = Fcdr (oldstate);
|
|
|
1229 tem = Fcar (oldstate); /* elt 3, instring */
|
|
|
1230 state.instring = !NILP (tem) ? XINT (tem) : -1;
|
|
|
1231
|
|
|
1232 oldstate = Fcdr (oldstate); /* elt 4, incomment */
|
|
|
1233 tem = Fcar (oldstate);
|
|
|
1234 state.incomment = !NILP (tem);
|
|
|
1235
|
|
|
1236 oldstate = Fcdr (oldstate);
|
|
|
1237 tem = Fcar (oldstate); /* elt 5, follows-quote */
|
|
|
1238 start_quoted = !NILP (tem);
|
|
|
1239
|
|
|
1240 /* if the eighth element of the list is nil, we are in comment style
|
|
|
1241 a. if it is non-nil, we are in comment style b */
|
|
|
1242 oldstate = Fcdr (oldstate);
|
|
|
1243 oldstate = Fcdr (oldstate);
|
|
|
1244 oldstate = Fcdr (oldstate);
|
|
|
1245 tem = Fcar (oldstate); /* elt 8, comment style a */
|
|
|
1246 state.comstyle = !NILP (tem);
|
|
|
1247 mask = state.comstyle ? SYNTAX_COMMENT_STYLE_B : SYNTAX_COMMENT_STYLE_A;
|
|
|
1248 }
|
|
|
1249 state.quoted = 0;
|
|
|
1250 mindepth = depth;
|
|
|
1251
|
|
|
1252 curlevel->prev = -1;
|
|
|
1253 curlevel->last = -1;
|
|
|
1254
|
|
|
1255 /* Enter the loop at a place appropriate for initial state. */
|
|
|
1256
|
|
|
1257 if (state.incomment) goto startincomment;
|
|
|
1258 if (state.instring >= 0)
|
|
|
1259 {
|
|
|
1260 if (start_quoted) goto startquotedinstring;
|
|
|
1261 goto startinstring;
|
|
|
1262 }
|
|
|
1263 if (start_quoted) goto startquoted;
|
|
|
1264
|
|
|
1265 while (from < end)
|
|
|
1266 {
|
|
|
1267 QUIT;
|
|
|
1268
|
|
|
1269 code = SYNTAX (table, BUF_FETCH_CHAR (buf, from));
|
|
|
1270 from++;
|
|
|
1271
|
|
|
1272 if (code == Scomment)
|
|
|
1273 {
|
|
|
1274 /* record the comment style we have entered so that only the
|
|
|
1275 comment-ender sequence (or single char) of the same style
|
|
|
1276 actually terminates the comment section. */
|
|
|
1277 mask = SYNTAX_COMMENT_1CHAR_MASK (table,
|
|
|
1278 BUF_FETCH_CHAR (buf, from-1));
|
|
|
1279 state.comstyle = (mask == SYNTAX_COMMENT_STYLE_B);
|
|
|
1280 state.comstart = from - 1;
|
|
|
1281 }
|
|
|
1282
|
|
|
1283 else if (from < end &&
|
|
|
1284 SYNTAX_START_P (table, BUF_FETCH_CHAR (buf, from-1),
|
|
|
1285 BUF_FETCH_CHAR (buf, from)))
|
|
|
1286 {
|
|
|
1287 /* Record the comment style we have entered so that only
|
|
|
1288 the comment-end sequence of the same style actually
|
|
|
1289 terminates the comment section. */
|
|
|
1290 code = Scomment;
|
|
|
1291 mask = SYNTAX_COMMENT_MASK_START (table,
|
|
|
1292 BUF_FETCH_CHAR (buf, from-1),
|
|
|
1293 BUF_FETCH_CHAR (buf, from));
|
|
|
1294 state.comstyle = (mask == SYNTAX_COMMENT_STYLE_B);
|
|
|
1295 state.comstart = from-1;
|
|
|
1296 from++;
|
|
|
1297 }
|
|
|
1298
|
|
|
1299 if (SYNTAX_PREFIX (table, BUF_FETCH_CHAR (buf, from - 1)))
|
|
|
1300 continue;
|
|
|
1301 switch (code)
|
|
|
1302 {
|
|
|
1303 case Sescape:
|
|
|
1304 case Scharquote:
|
|
|
1305 if (stopbefore) goto stop; /* this arg means stop at sexp start */
|
|
|
1306 curlevel->last = from - 1;
|
|
|
1307 startquoted:
|
|
|
1308 if (from == end) goto endquoted;
|
|
|
1309 from++;
|
|
|
1310 goto symstarted;
|
|
|
1311 /* treat following character as a word constituent */
|
|
|
1312 case Sword:
|
|
|
1313 case Sextword:
|
|
|
1314 case Ssymbol:
|
|
|
1315 if (stopbefore) goto stop; /* this arg means stop at sexp start */
|
|
|
1316 curlevel->last = from - 1;
|
|
|
1317 symstarted:
|
|
|
1318 while (from < end)
|
|
|
1319 {
|
|
|
1320 switch (SYNTAX (table, BUF_FETCH_CHAR (buf, from)))
|
|
|
1321 {
|
|
|
1322 case Scharquote:
|
|
|
1323 case Sescape:
|
|
|
1324 from++;
|
|
|
1325 if (from == end) goto endquoted;
|
|
|
1326 break;
|
|
|
1327 case Sword:
|
|
|
1328 case Sextword:
|
|
|
1329 case Ssymbol:
|
|
|
1330 case Squote:
|
|
|
1331 break;
|
|
|
1332 default:
|
|
|
1333 goto symdone;
|
|
|
1334 }
|
|
|
1335 from++;
|
|
|
1336 }
|
|
|
1337 symdone:
|
|
|
1338 curlevel->prev = curlevel->last;
|
|
|
1339 break;
|
|
|
1340
|
|
|
1341 case Scomment:
|
|
|
1342 state.incomment = 1;
|
|
|
1343 startincomment:
|
|
|
1344 if (commentstop)
|
|
|
1345 goto done;
|
|
|
1346 {
|
|
|
1347 Bufpos newfrom = find_end_of_comment (buf, from, end, mask);
|
|
|
1348 if (newfrom < 0)
|
|
|
1349 {
|
|
|
1350 /* we terminated search because from == end */
|
|
|
1351 from = end;
|
|
|
1352 goto done;
|
|
|
1353 }
|
|
|
1354 from = newfrom;
|
|
|
1355 }
|
|
|
1356 state.incomment = 0;
|
|
|
1357 state.comstyle = 0; /* reset the comment style */
|
|
|
1358 mask = 0;
|
|
|
1359 break;
|
|
|
1360
|
|
|
1361 case Sopen:
|
|
|
1362 if (stopbefore) goto stop; /* this arg means stop at sexp start */
|
|
|
1363 depth++;
|
|
|
1364 /* curlevel++->last ran into compiler bug on Apollo */
|
|
|
1365 curlevel->last = from - 1;
|
|
|
1366 if (++curlevel == endlevel)
|
|
|
1367 error ("Nesting too deep for parser");
|
|
|
1368 curlevel->prev = -1;
|
|
|
1369 curlevel->last = -1;
|
|
16
|
1370 if (targetdepth == depth) goto done;
|
|
0
|
1371 break;
|
|
|
1372
|
|
|
1373 case Sclose:
|
|
|
1374 depth--;
|
|
|
1375 if (depth < mindepth)
|
|
|
1376 mindepth = depth;
|
|
|
1377 if (curlevel != levelstart)
|
|
|
1378 curlevel--;
|
|
|
1379 curlevel->prev = curlevel->last;
|
|
16
|
1380 if (targetdepth == depth) goto done;
|
|
0
|
1381 break;
|
|
|
1382
|
|
|
1383 case Sstring:
|
|
|
1384 {
|
|
|
1385 Emchar ch;
|
|
|
1386 if (stopbefore) goto stop; /* this arg means stop at sexp start */
|
|
|
1387 curlevel->last = from - 1;
|
|
|
1388 /* XEmacs change: call syntax_match() on character */
|
|
|
1389 ch = BUF_FETCH_CHAR (buf, from - 1);
|
|
|
1390 {
|
|
|
1391 Lisp_Object stermobj = syntax_match (table, ch);
|
|
|
1392
|
|
|
1393 if (CHARP (stermobj))
|
|
|
1394 state.instring = XCHAR (stermobj);
|
|
|
1395 else
|
|
|
1396 state.instring = ch;
|
|
|
1397 }
|
|
|
1398 }
|
|
|
1399 startinstring:
|
|
|
1400 while (1)
|
|
|
1401 {
|
|
|
1402 if (from >= end) goto done;
|
|
|
1403 if (BUF_FETCH_CHAR (buf, from) == state.instring) break;
|
|
|
1404 switch (SYNTAX (table, BUF_FETCH_CHAR (buf, from)))
|
|
|
1405 {
|
|
|
1406 case Scharquote:
|
|
|
1407 case Sescape:
|
|
|
1408 {
|
|
|
1409 from++;
|
|
|
1410 startquotedinstring:
|
|
|
1411 if (from >= end) goto endquoted;
|
|
|
1412 break;
|
|
|
1413 }
|
|
|
1414 default:
|
|
|
1415 break;
|
|
|
1416 }
|
|
|
1417 from++;
|
|
|
1418 }
|
|
|
1419 state.instring = -1;
|
|
|
1420 curlevel->prev = curlevel->last;
|
|
|
1421 from++;
|
|
|
1422 break;
|
|
|
1423
|
|
|
1424 case Smath:
|
|
|
1425 break;
|
|
|
1426
|
|
|
1427 case Swhitespace:
|
|
|
1428 case Spunct:
|
|
|
1429 case Squote:
|
|
|
1430 case Sendcomment:
|
|
|
1431 case Sinherit:
|
|
|
1432 case Smax:
|
|
|
1433 break;
|
|
|
1434 }
|
|
|
1435 }
|
|
|
1436 goto done;
|
|
|
1437
|
|
|
1438 stop: /* Here if stopping before start of sexp. */
|
|
|
1439 from--; /* We have just fetched the char that starts it; */
|
|
|
1440 goto done; /* but return the position before it. */
|
|
|
1441
|
|
|
1442 endquoted:
|
|
|
1443 state.quoted = 1;
|
|
|
1444 done:
|
|
|
1445 state.depth = depth;
|
|
|
1446 state.mindepth = mindepth;
|
|
|
1447 state.thislevelstart = curlevel->prev;
|
|
|
1448 state.prevlevelstart
|
|
|
1449 = (curlevel == levelstart) ? -1 : (curlevel - 1)->last;
|
|
|
1450 state.location = from;
|
|
|
1451
|
|
|
1452 *stateptr = state;
|
|
|
1453 }
|
|
|
1454
|
|
|
1455 DEFUN ("parse-partial-sexp", Fparse_partial_sexp, Sparse_partial_sexp, 2, 7, 0 /*
|
|
|
1456 Parse Lisp syntax starting at FROM until TO; return status of parse at TO.
|
|
|
1457 Parsing stops at TO or when certain criteria are met;
|
|
|
1458 point is set to where parsing stops.
|
|
|
1459 If fifth arg STATE is omitted or nil,
|
|
|
1460 parsing assumes that FROM is the beginning of a function.
|
|
|
1461 Value is a list of eight elements describing final state of parsing:
|
|
|
1462 0. depth in parens.
|
|
|
1463 1. character address of start of innermost containing list; nil if none.
|
|
|
1464 2. character address of start of last complete sexp terminated.
|
|
|
1465 3. non-nil if inside a string.
|
|
|
1466 (It is the character that will terminate the string.)
|
|
|
1467 4. t if inside a comment.
|
|
|
1468 5. t if following a quote character.
|
|
|
1469 6. the minimum paren-depth encountered during this scan.
|
|
|
1470 7. nil if in comment style a, or not in a comment; t if in comment style b
|
|
|
1471 If third arg TARGETDEPTH is non-nil, parsing stops if the depth
|
|
|
1472 in parentheses becomes equal to TARGETDEPTH.
|
|
|
1473 Fourth arg STOPBEFORE non-nil means stop when come to
|
|
|
1474 any character that starts a sexp.
|
|
|
1475 Fifth arg STATE is an eight-element list like what this function returns.
|
|
|
1476 It is used to initialize the state of the parse. Its second and third
|
|
|
1477 elements are ignored.
|
|
|
1478 Sixth arg COMMENTSTOP non-nil means stop at the start of a comment.
|
|
|
1479 */ )
|
|
|
1480 (from, to, targetdepth, stopbefore, oldstate, commentstop, buffer)
|
|
|
1481 Lisp_Object from, to, targetdepth, stopbefore, oldstate, commentstop, buffer;
|
|
|
1482 {
|
|
|
1483 struct lisp_parse_state state;
|
|
|
1484 int target;
|
|
|
1485 Bufpos start, end;
|
|
|
1486 struct buffer *buf = decode_buffer (buffer, 0);
|
|
|
1487
|
|
|
1488 if (!NILP (targetdepth))
|
|
|
1489 {
|
|
|
1490 CHECK_INT (targetdepth);
|
|
|
1491 target = XINT (targetdepth);
|
|
|
1492 }
|
|
|
1493 else
|
|
|
1494 target = -100000; /* We won't reach this depth */
|
|
|
1495
|
|
|
1496 get_buffer_range_char (buf, from, to, &start, &end, 0);
|
|
|
1497 scan_sexps_forward (buf, &state, start, end,
|
|
|
1498 target, !NILP (stopbefore), oldstate,
|
|
|
1499 !NILP (commentstop));
|
|
|
1500
|
|
|
1501 BUF_SET_PT (buf, state.location);
|
|
|
1502
|
|
|
1503 {
|
|
|
1504 /*
|
|
|
1505 * This junk is necessary because of a bug in SparcWorks cc 2.0.1. It
|
|
|
1506 * doesn't handle functions as arguments to other functions very well.
|
|
|
1507 */
|
|
|
1508 Lisp_Object retval[8];
|
|
|
1509
|
|
|
1510 retval[0] = make_int (state.depth);
|
|
|
1511 retval[1] = ((state.prevlevelstart < 0) ? Qnil :
|
|
|
1512 make_int (state.prevlevelstart));
|
|
|
1513 retval[2] = ((state.thislevelstart < 0) ? Qnil :
|
|
|
1514 make_int (state.thislevelstart));
|
|
|
1515 retval[3] = ((state.instring >= 0) ? make_int (state.instring) : Qnil);
|
|
|
1516 retval[4] = ((state.incomment) ? Qt : Qnil);
|
|
|
1517 retval[5] = ((state.quoted) ? Qt : Qnil);
|
|
|
1518 retval[6] = make_int (state.mindepth);
|
|
|
1519 retval[7] = ((state.comstyle) ? Qt : Qnil);
|
|
|
1520
|
|
|
1521 return (Flist (8, retval));
|
|
|
1522 }
|
|
|
1523 }
|
|
|
1524
|
|
|
1525
|
|
|
1526 /************************************************************************/
|
|
|
1527 /* initialization */
|
|
|
1528 /************************************************************************/
|
|
|
1529
|
|
|
1530 void
|
|
|
1531 syms_of_syntax (void)
|
|
|
1532 {
|
|
|
1533 defsymbol (&Qsyntax_table_p, "syntax-table-p");
|
|
|
1534
|
|
|
1535 defsubr (&Ssyntax_table_p);
|
|
|
1536 defsubr (&Ssyntax_table);
|
|
|
1537 defsubr (&Sstandard_syntax_table);
|
|
|
1538 defsubr (&Scopy_syntax_table);
|
|
|
1539 defsubr (&Sset_syntax_table);
|
|
|
1540 defsubr (&Ssyntax_designator_chars);
|
|
|
1541 defsubr (&Schar_syntax);
|
|
|
1542 defsubr (&Smatching_paren);
|
|
|
1543 /* defsubr (&Smodify_syntax_entry); now in Lisp. */
|
|
|
1544 /* defsubr (&Sdescribe_syntax); now in Lisp. */
|
|
|
1545
|
|
|
1546 defsubr (&Sforward_word);
|
|
|
1547
|
|
|
1548 defsubr (&Sforward_comment);
|
|
|
1549 defsubr (&Sscan_lists);
|
|
|
1550 defsubr (&Sscan_sexps);
|
|
|
1551 defsubr (&Sbackward_prefix_chars);
|
|
|
1552 defsubr (&Sparse_partial_sexp);
|
|
|
1553 }
|
|
|
1554
|
|
|
1555 void
|
|
|
1556 vars_of_syntax (void)
|
|
|
1557 {
|
|
|
1558 DEFVAR_BOOL ("parse-sexp-ignore-comments", &parse_sexp_ignore_comments /*
|
|
|
1559 Non-nil means `forward-sexp', etc., should treat comments as whitespace.
|
|
|
1560 */ );
|
|
|
1561
|
|
|
1562 words_include_escapes = 0;
|
|
|
1563 DEFVAR_BOOL ("words-include-escapes", &words_include_escapes /*
|
|
|
1564 Non-nil means `forward-word', etc., should treat escape chars part of words.
|
|
|
1565 */ );
|
|
|
1566
|
|
|
1567 no_quit_in_re_search = 0;
|
|
|
1568 }
|
|
|
1569
|
|
|
1570 void
|
|
|
1571 complex_vars_of_syntax (void)
|
|
|
1572 {
|
|
|
1573 struct Lisp_Vector *v;
|
|
|
1574 int i;
|
|
|
1575
|
|
|
1576 /* Set this now, so first buffer creation can refer to it. */
|
|
|
1577 /* Make it nil before calling copy-syntax-table
|
|
|
1578 so that copy-syntax-table will know not to try to copy from garbage */
|
|
|
1579 Vstandard_syntax_table = Qnil;
|
|
|
1580 Vstandard_syntax_table = Fcopy_syntax_table (Qnil);
|
|
|
1581 staticpro (&Vstandard_syntax_table);
|
|
|
1582
|
|
|
1583 Vsyntax_designator_chars_string = make_pure_string (syntax_code_spec,
|
|
|
1584 Smax, Qnil, 1);
|
|
|
1585 staticpro (&Vsyntax_designator_chars_string);
|
|
|
1586
|
|
|
1587 v = XVECTOR (Vstandard_syntax_table);
|
|
|
1588
|
|
|
1589 for (i = 'a'; i <= 'z'; i++)
|
|
|
1590 v->contents[i] = make_int ((int) Sword);
|
|
|
1591 for (i = 'A'; i <= 'Z'; i++)
|
|
|
1592 v->contents[i] = make_int ((int) Sword);
|
|
|
1593 for (i = '0'; i <= '9'; i++)
|
|
|
1594 v->contents[i] = make_int ((int) Sword);
|
|
|
1595 v->contents['$'] = make_int ((int) Sword);
|
|
|
1596 v->contents['%'] = make_int ((int) Sword);
|
|
|
1597
|
|
|
1598 v->contents['('] = make_int ((int) Sopen + (')' << 8));
|
|
|
1599 v->contents[')'] = make_int ((int) Sclose + ('(' << 8));
|
|
|
1600 v->contents['['] = make_int ((int) Sopen + (']' << 8));
|
|
|
1601 v->contents[']'] = make_int ((int) Sclose + ('[' << 8));
|
|
|
1602 v->contents['{'] = make_int ((int) Sopen + ('}' << 8));
|
|
|
1603 v->contents['}'] = make_int ((int) Sclose + ('{' << 8));
|
|
|
1604 v->contents['"'] = make_int ((int) Sstring);
|
|
|
1605 v->contents['\\'] = make_int ((int) Sescape);
|
|
|
1606
|
|
|
1607 {
|
|
|
1608 CONST char *p;
|
|
|
1609
|
|
|
1610 for (p = "_-+*/&|<>="; *p; p++)
|
|
|
1611 v->contents[(int) *p] = make_int ((int) Ssymbol);
|
|
|
1612
|
|
|
1613 for (p = ".,;:?!#@~^'`"; *p; p++)
|
|
|
1614 v->contents[(int) *p] = make_int ((int) Spunct);
|
|
|
1615 }
|
|
|
1616 }
|
