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annotate c/regexParser/regexParser.cc @ 134:dbafc753078e pairPro

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fix concatination & selection & grouping
author masa
date Fri, 04 Dec 2015 17:45:09 +0900
parents ccc673449351
children e1a262ec75f0
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
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61 CharClassPtr cc = NEW(CharClass);
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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 + 1;
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67 cc->cond->range->next = NULL;
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68
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69 int i = 0;
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70
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71 RangeListPtr rangeList = cc->cond->range;
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72
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73 while (ri->ptr[i] != ']') {
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74 if (ri->ptr[i] == '-') i++;
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75
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76 rangeList->end = ri->ptr + i;
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77 rangeList->next = NEW(RangeList);
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78 rangeList = rangeList->next;
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79 rangeList->begin = ri->ptr+i+1;
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80 rangeList->next = NULL;
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81 i++;
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82 }
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83 // TODO literal support
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84
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85 rangeList->end = ri->ptr + i - 1;
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86 NodePtr n = createNode(ri,'c',cc,0,0);
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87 token(ri);
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88 return n;
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89 }
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91 // <literal> ::= [a-z][A-Z][0-9]
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92 static
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93 NodePtr literal(RegexInfoPtr ri) {
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94 CharClassPtr cc = createCharClassWord(ri);
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95 NodePtr n = createNode(ri,'a',cc,0,0);
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96 return n;
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97 }
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98
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99 static
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100 void token(RegexInfoPtr ri) {
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101 while (ri->ptr[0] != '\0') {
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102 if (ri->ptr[0] == '('){
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103 ri->ptr++;
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104 ri->tokenType = '(';
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105 ri->tokenValue = NULL;
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106 return;
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107 } else if (ri->ptr[0] == ')') {
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108 ri->ptr++;
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109 ri->tokenType = ')';
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110 ri->tokenValue = ri->ptr;
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111 return;
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112 } else if (ri->ptr[0] == '[') {
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113 ri->ptr++;
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114 ri->tokenType = 'c';
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115 ri->tokenValue = ri->ptr;
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116 return;
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117 } else if (ri->ptr[0] == '|'){
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118 ri->ptr++;
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119 ri->tokenType = '|';
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120 ri->tokenValue = NULL;
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121 ri->orNum++;
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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 = NULL;
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127 return;
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128 } else if (ri->ptr[0] == '\\'){
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129 // need more proccesing
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130 /*
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131 \277
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132 \0xa5
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133 \[
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134 \\
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135 \utf-8 etc...
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136 */
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137 } else {
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138 ri->tokenType = 'a';
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139 ri->tokenValue = ri->ptr;
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140 if (isalnum(ri->ptr[0])) {
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141 ri->ptr++;
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142 }
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143 return;
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144 }
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145 }
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146 ri->tokenType = 0;
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147 ri->tokenValue = NULL;
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148 return;
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149 }
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150
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151 // <regexAtom> ::= <literal>|<charClass>|<group>
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152 static
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153 NodePtr regexAtom(RegexInfoPtr ri) {
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154
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155 NodePtr n = NULL;
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156 if (ri->tokenType == 'c') n = charClass(ri);
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157 else if (ri->tokenType == 'a') n = literal(ri);
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158 else if (ri->tokenType == '(') {
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159 n = regex(ri);
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160 if (ri->tokenType != ')') {
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161 // error
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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
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170 return n;
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171 }
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172
133
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173 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
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174 NodePtr regex(RegexInfoPtr ri) {
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175 token(ri);
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176 NodePtr n = regexAtom(ri);
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177 while (ri->tokenType) {
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178 if (ri->tokenType == '*') {
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179 n = createNode(ri,'*',0,n,0);
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180 token(ri);
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181 return n;
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182 } else if (ri->tokenType == '|') {
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183 n = createNode(ri,'|',0,n,0);
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184 NodePtr n1 = regex(ri);
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185 n->right = n1;
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186 } else if (ri->tokenType == ')') {
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187 return n;
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188 } else {
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189 n = createNode(ri,'+',0,n,0);
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190 NodePtr n1 = regexAtom(ri);
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191 n->right = n1;
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192 }
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193 }
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194 return n;
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195 }