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annotate c/regexParser/regexParser.cc @ 135:e1a262ec75f0 pairPro

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impl charclass
author masa
date Fri, 04 Dec 2015 19:07:10 +0900
parents dbafc753078e
children 15815fcb6c2f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 "error.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 NodePtr regex(RegexInfoPtr);
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12
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13 /**
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14 * Create a node of regex parse tree.
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15 * tokenType
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16 * regexPosition(state)
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17 * stateTransitionTable
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18 */
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19
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20 static
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21 NodePtr allocateNode() {
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22 NodePtr n = NEW(Node);
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23 n->cc = NULL;
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24 n->left = NULL;
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25 n->right = NULL;
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26 return n;
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27 }
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28
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29 static
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30 CharClassPtr createCharClassWord(RegexInfoPtr ri) {
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31 CharClassPtr cc = NEW(CharClass);
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32 cc->type = 'a';
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33 cc->cond = NEW(Condition);
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34 cc->cond->w = NEW(Word);
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35 cc->cond->w->word = ri->tokenValue;
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36 cc->cond->w->length = ri->ptr - ri->tokenValue;
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37 token(ri);
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38
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39 return cc;
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40 }
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41
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42 static
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43 NodePtr createNode(RegexInfoPtr ri,unsigned char type,CharClassPtr cc, NodePtr left, NodePtr right) {
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44 NodePtr n = allocateNode();
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45
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46 n->tokenType = type;
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47 n->cc = cc;
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48 n->left = left;
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49 n->right = right;
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50 n->nodeNumber = ri->nodeNumber;
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51 ri->nodeNumber++;
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52
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53 return n;
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54 }
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55
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56
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57 // <charClass> ::= '['<literal>'-'<literal>']'
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58 static
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59 NodePtr charClass(RegexInfoPtr ri) {
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60 CharClassPtr cc = NEW(CharClass);
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61 NodePtr n = createNode(ri,'c',cc,0,0);
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62 cc->type = 'r';
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63 cc->cond = NEW(Condition);
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64 cc->cond->range = NEW(RangeList);
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65 cc->cond->range->begin = ri->ptr;
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66 cc->cond->range->end = ri->ptr;
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67 cc->cond->range->next = NULL;
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69
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70 RangeListPtr rangeList = cc->cond->range;
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71
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72 for (ri->ptr++; *ri->ptr && *ri->ptr != ']'; ri->ptr++) {
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73 if (*ri->ptr == '-') {
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74 rangeList->end = ri->ptr + 1;
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75 ri->ptr++;
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76 continue;
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77 }
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78 if (ri->ptr[0] == 0 || ri->ptr[0] == ']') break;
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79 if (ri->ptr[0] == rangeList->end[0] + 1) {
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80 rangeList->end = ri->ptr;
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81 continue;
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82 }
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83 rangeList->next = NEW(RangeList);
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84 rangeList = rangeList->next;
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85 rangeList->begin = ri->ptr;
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86 rangeList->end = ri->ptr;
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87 rangeList->next = NULL;
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88 }
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89 // TODO literal support
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91 if (*ri->ptr) ri->ptr++;
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92 token(ri);
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93 token(ri);
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94 return n;
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95 }
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97 // <literal> ::= [a-z][A-Z][0-9]
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98 static
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99 NodePtr literal(RegexInfoPtr ri) {
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100 CharClassPtr cc = createCharClassWord(ri);
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101 NodePtr n = createNode(ri,'a',cc,0,0);
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102 return n;
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103 }
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104
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105 static
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106 void token(RegexInfoPtr ri) {
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107 while (ri->ptr[0] != '\0') {
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108 if (ri->ptr[0] == '('){
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109 ri->ptr++;
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110 ri->tokenType = '(';
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111 ri->tokenValue = NULL;
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112 return;
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113 } else if (ri->ptr[0] == ')') {
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114 ri->ptr++;
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115 ri->tokenType = ')';
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116 ri->tokenValue = ri->ptr;
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117 return;
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118 } else if (ri->ptr[0] == '[') {
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119 ri->ptr++;
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120 ri->tokenType = 'c';
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121 ri->tokenValue = ri->ptr;
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122 return;
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123 } else if (ri->ptr[0] == ']') {
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124 ri->ptr++;
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125 ri->tokenType = ']';
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126 ri->tokenValue = ri->ptr;
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127 return;
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128 } else if (ri->ptr[0] == '|'){
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129 ri->ptr++;
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130 ri->tokenType = '|';
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131 ri->tokenValue = NULL;
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132 ri->orNum++;
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133 return;
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134 } else if (ri->ptr[0] == '*'){
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135 ri->ptr++;
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136 ri->tokenType = '*';
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137 ri->tokenValue = NULL;
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138 return;
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139 } else if (ri->ptr[0] == '\\'){
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140 // need more proccesing
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141 /*
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142 \277
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143 \0xa5
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144 \[
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145 \\
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146 \utf-8 etc...
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147 */
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148 } else {
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149 ri->tokenType = 'a';
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150 ri->tokenValue = ri->ptr;
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151 if (isalnum(ri->ptr[0])) {
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152 ri->ptr++;
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153 }
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154 return;
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155 }
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156 }
134
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157 ri->tokenType = 0;
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158 ri->tokenValue = NULL;
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159 return;
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160 }
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161
130
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162 // <regexAtom> ::= <literal>|<charClass>|<group>
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163 static
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164 NodePtr regexAtom(RegexInfoPtr ri) {
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165
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166 NodePtr n = NULL;
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167 if (ri->tokenType == 'c') n = charClass(ri);
134
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168 else if (ri->tokenType == 'a') n = literal(ri);
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169 else if (ri->tokenType == '(') {
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170 n = regex(ri);
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171 if (ri->tokenType != ')') {
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172 // error
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173 }
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174 token(ri);
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175 }
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176 if (ri->tokenType == '*') {
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177 n = createNode(ri,'*',0,n,0);
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178 token(ri);
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179 }
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180
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181 return n;
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182 }
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183
133
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184 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
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185 NodePtr regex(RegexInfoPtr ri) {
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186 token(ri);
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187 NodePtr n = regexAtom(ri);
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188 while (ri->tokenType) {
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189 if (ri->tokenType == '*') {
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190 n = createNode(ri,'*',0,n,0);
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191 token(ri);
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192 return n;
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193 } else if (ri->tokenType == '|') {
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194 n = createNode(ri,'|',0,n,0);
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195 NodePtr n1 = regex(ri);
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196 n->right = n1;
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197 } else if (ri->tokenType == ')') {
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198 return n;
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199 } else {
134
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200 n = createNode(ri,'+',0,n,0);
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201 NodePtr n1 = regexAtom(ri);
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202 n->right = n1;
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203 }
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204 }
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205 return n;
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206 }