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annotate regexParser/regexParser.cc @ 314:a4484c02cba5

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add wordMode in regexParser
author mir3636
date Sat, 07 May 2016 18:38:54 +0900
parents 1188debbef10
children fa590a7272ae
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <string.h>
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4 #include <ctype.h>
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5 #include "regexParser.h"
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6 #include "CharClass.h"
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7
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8 static NodePtr charClass(RegexInfoPtr);
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9 static void token(RegexInfoPtr);
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10 static NodePtr regexAtom(RegexInfoPtr);
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11
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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12 /**
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13 * Create a node of regex parse tree.
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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14 * tokenType
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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15 * regexPosition(state)
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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16 * stateTransitionTable
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17 */
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18 static
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19 NodePtr allocateNode() {
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20 NodePtr n = NEW(Node);
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21 n->cc = NULL;
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22 n->stateNum = 0;
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23 n->nextStateNum = 0;
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24 n->state = NULL;
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25 n->nextState = NULL;
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26 n->left = NULL;
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27 n->right = NULL;
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28 return n;
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29 }
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30
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31 NodePtr createNode(RegexInfoPtr ri,unsigned char type,CharClassPtr cc, NodePtr left, NodePtr right) {
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32 NodePtr n = allocateNode();
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33 n->tokenType = type;
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34 n->cc = cc;
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35 n->state = NULL;
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36 n->left = left;
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37 n->right = right;
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38 return n;
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39 }
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40
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41 // <charClass> ::= '['<literal>'-'<literal>']'
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42 static
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43 NodePtr charClass(RegexInfoPtr ri) {
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44 CharClassPtr cc = NULL;
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45 NodePtr n = createNode(ri,'c',cc,0,0);
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46 unsigned char begin = *ri->ptr;
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47 unsigned char end = *ri->ptr;
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48
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49 for (ri->ptr++; *ri->ptr && *ri->ptr != ']'; ri->ptr++) {
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50 if (*ri->ptr == '-') {
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51 end = *(ri->ptr + 1);
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52 cc = insertCharClass(cc, begin, end);
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53 ri->ptr++;
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54 continue;
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55 } else {
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56 cc = insertCharClass(cc, begin, end);
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57 }
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58 if (ri->ptr[0] == 0 || ri->ptr[0] == ']') break;
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59 begin = *ri->ptr;
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60 end = *ri->ptr;
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61 }
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62 n->cc = insertCharClass(cc, begin, end);
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63 // TODO literal support
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64 // merge rangeList here
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65 if (*ri->ptr) ri->ptr++;
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66 token(ri);
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67 return n;
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68 }
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69
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70 // <literal> ::= [a-z][A-Z][0-9]
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71 static
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72 NodePtr literal(RegexInfoPtr ri) {
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73 CharClassPtr cc = createCharClassWord(ri);
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74 if (ri->wordMode) {
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75 unsigned char *word = ri->ptr - 1;
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76 while (ri->tokenType == 'a') {
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77 token(ri);
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78 }
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79 cc->cond.w.length = ri->ptr - word;
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80 if (cc->cond.w.length > 1)
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81 cc->cond.w.word = word;
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82 } else
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83 token(ri);
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84 NodePtr n = createNode(ri,'a',cc,0,0);
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85 return n;
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86 }
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87
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ccc673449351 Look ahead '*'
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88 static
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89 void token(RegexInfoPtr ri) {
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90 while (ri->ptr[0] != '\0') {
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91 if (ri->ptr[0] == '('){
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92 ri->ptr++;
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93 ri->tokenType = '(';
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94 ri->tokenValue = NULL;
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95 return;
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96 } else if (ri->ptr[0] == ')') {
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97 ri->ptr++;
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98 ri->tokenType = ')';
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99 ri->tokenValue = ri->ptr;
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100 return;
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101 } else if (ri->ptr[0] == ']') {
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102 ri->ptr++;
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103 ri->tokenType = ']';
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104 ri->tokenValue = ri->ptr;
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105 return;
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106 } else if (ri->ptr[0] == '|'){
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107 ri->ptr++;
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108 ri->tokenType = '|';
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109 ri->tokenValue = NULL;
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110 return;
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111 } else if (ri->ptr[0] == '*'){
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112 ri->ptr++;
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113 ri->tokenType = '*';
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114 ri->tokenValue = NULL;
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115 return;
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116 } else if (ri->ptr[0] == '\\'){
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117 // need more proccesing
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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118 /*
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119 \277
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120 \0xa5
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121 \[
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122 \\
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123 \utf-8 etc...
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124 */
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125 ri->ptr++;
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126 ri->tokenType = 'a';
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127 ri->tokenValue = ri->ptr;
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128 ri->ptr++;
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129 return;
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130 } else if (ri->ptr[0] == '[') {
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131 ri->ptr++;
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132 ri->tokenType = 'c';
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133 ri->tokenValue = ri->ptr;
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134 return;
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135 } else {
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136 ri->tokenType = 'a';
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137 ri->tokenValue = ri->ptr;
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138 // if (isalnum(ri->ptr[0])) {
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139 ri->ptr++;
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140 // }
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141 return;
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142 }
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143 }
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144 ri->tokenType = 0;
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145 ri->tokenValue = NULL;
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146 return;
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147 }
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148
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149 // <regexAtom> ::= <literal>|<charClass>|<group>
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150 static
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151 NodePtr regexAtom(RegexInfoPtr ri) {
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152
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153 NodePtr n = NULL;
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154 if (ri->tokenType == 'c') n = charClass(ri);
134
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155 else if (ri->tokenType == 'a') n = literal(ri);
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156 else if (ri->tokenType == '(') {
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157 n = regex(ri);
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158 if (ri->tokenType != ')') {
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159 // error
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160 fprintf(stderr,"unclosed ')' before %s \n", ri->ptr);
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161 return createNode(ri,0,0,0,0);
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162 }
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163 token(ri);
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164 }
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165 if (ri->tokenType == '*') {
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166 n = createNode(ri,'*',0,n,0);
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167 token(ri);
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168 }
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169 return n;
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170 }
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171
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172 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
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173 NodePtr regex(RegexInfoPtr ri) {
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174 token(ri);
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175 NodePtr n = regexAtom(ri);
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176 while (ri->tokenType) {
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177 if (ri->tokenType == '*') {
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178 n = createNode(ri,'*',0,n,0);
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179 token(ri);
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180 return n;
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181 } else if (ri->tokenType == '|') {
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182 n = createNode(ri,'|',0,n,0);
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183 NodePtr n1 = regex(ri);
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184 n->right = n1;
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185 } else if (ri->tokenType == ')') {
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186 return n;
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187 } else if (ri->tokenType == ']') {
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188 // error
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189 return n;
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190 } else {
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191 n = createNode(ri,'+',0,n,0);
180
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192 NodePtr n1 = regexAtom(ri);
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193 n->right = n1;
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194 }
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195 }
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196 return n;
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197 }