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annotate c/regexParser/regexParser.cc @ 142:de0f332d560c pairPro

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insert charClassMerge function
author masa
date Fri, 11 Dec 2015 14:54:00 +0900
parents 15815fcb6c2f
children 32977f5a2ed0
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.w.word = ri->tokenValue;
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34 cc->cond.w.length = ri->ptr - ri->tokenValue;
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35 cc->nextState.bitContainer = 0;
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36 token(ri);
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37
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38 return cc;
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39 }
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40
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41 static
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42 NodePtr createNode(RegexInfoPtr ri,unsigned char type,CharClassPtr cc, NodePtr left, NodePtr right) {
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43 NodePtr n = allocateNode();
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44
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45 n->tokenType = type;
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46 n->cc = cc;
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47 n->left = left;
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48 n->right = right;
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49 n->nodeNumber = ri->nodeNumber;
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50 ri->nodeNumber++;
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51
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52 return n;
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53 }
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54
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55 CharClassPtr charClassMerge(CharClassPtr src, CharClassPtr add) {
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56 // 重なっているccの領域を分割する
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57 // 必要ならばnextStateを重ねあわせる
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58 // 変更があった場合は新しくリストを作って返す
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59 if (src->type == 'a') {
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60 if (add->type == 'a') {
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61 if (src->cond.w.word[0] > add->cond.w.word[0]) {
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62 // add のほうが小さいので小さい順のccをつくる
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63 CharClassPtr left = charClassMerge(add->left.src);
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64 return createCharClassWord(add->cond->w.word, left, add->right);
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65 } else {
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66
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67 }
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68 } else if (add->type == 'c') {
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69 //
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70 if (src->cond.w.word[0] < add->cond.range.begin) {
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71
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72 } else (src->cond->w.word[0] < add->end) {
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73 } else if (src->type == 'c') {
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74
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75 }
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76 }
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77
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78 // <charClass> ::= '['<literal>'-'<literal>']'
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79 static
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80 NodePtr charClass(RegexInfoPtr ri) {
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81 CharClassPtr cc = NEW(CharClass);
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82 NodePtr n = createNode(ri,'c',cc,0,0);
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83 cc->type = 'r';
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84 cc->nextState.bitContainer = 0;
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85 RangeListPtr rangeList = &cc->cond.range;
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86 rangeList->begin = ri->ptr;
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87 rangeList->end = ri->ptr;
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88
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89 for (ri->ptr++; *ri->ptr && *ri->ptr != ']'; ri->ptr++) {
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90 if (*ri->ptr == '-') {
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91 rangeList->end = ri->ptr + 1;
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92 ri->ptr++;
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93 continue;
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94 }
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95 if (ri->ptr[0] == 0 || ri->ptr[0] == ']') break;
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96 if (ri->ptr[0] == rangeList->end[0] + 1) {
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97 rangeList->end = ri->ptr;
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98 continue;
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99 }
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100 rangeList->next = NEW(RangeList);
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101 rangeList = rangeList->next;
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102 rangeList->begin = ri->ptr;
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103 rangeList->end = ri->ptr;
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104 rangeList->next = NULL;
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105 }
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106 // TODO literal support
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107 // merge rangeList here
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108 if (*ri->ptr) ri->ptr++;
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109 token(ri);
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110 return n;
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111 }
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112
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113 // <literal> ::= [a-z][A-Z][0-9]
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114 static
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115 NodePtr literal(RegexInfoPtr ri) {
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116 CharClassPtr cc = createCharClassWord(ri);
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117 NodePtr n = createNode(ri,'a',cc,0,0);
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118 return n;
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119 }
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120
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121 static
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122 void token(RegexInfoPtr ri) {
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123 while (ri->ptr[0] != '\0') {
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124 if (ri->ptr[0] == '('){
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125 ri->ptr++;
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126 ri->tokenType = '(';
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127 ri->tokenValue = NULL;
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128 return;
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129 } else if (ri->ptr[0] == ')') {
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130 ri->ptr++;
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131 ri->tokenType = ')';
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132 ri->tokenValue = ri->ptr;
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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 = ri->ptr;
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138 return;
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139 } else if (ri->ptr[0] == '|'){
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140 ri->ptr++;
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141 ri->tokenType = '|';
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142 ri->tokenValue = NULL;
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143 ri->orNum++;
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144 return;
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145 } else if (ri->ptr[0] == '*'){
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146 ri->ptr++;
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147 ri->tokenType = '*';
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148 ri->tokenValue = NULL;
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149 return;
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150 } else if (ri->ptr[0] == '\\'){
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151 // need more proccesing
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152 /*
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153 \277
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154 \0xa5
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155 \[
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156 \\
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157 \utf-8 etc...
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158 */
142
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159 } else if (ri->ptr[0] == '[') {
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160 ri->ptr++;
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161 ri->tokenType = 'c';
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162 ri->tokenValue = ri->ptr;
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163 return;
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164 } else {
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165 ri->tokenType = 'a';
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166 ri->tokenValue = ri->ptr;
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167 if (isalnum(ri->ptr[0])) {
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168 ri->ptr++;
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169 }
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170 return;
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171 }
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172 }
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173 ri->tokenType = 0;
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174 ri->tokenValue = NULL;
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175 return;
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176 }
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177
130
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178 // <regexAtom> ::= <literal>|<charClass>|<group>
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179 static
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180 NodePtr regexAtom(RegexInfoPtr ri) {
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181
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182 NodePtr n = NULL;
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183 if (ri->tokenType == 'c') n = charClass(ri);
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184 else if (ri->tokenType == 'a') n = literal(ri);
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185 else if (ri->tokenType == '(') {
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186 n = regex(ri);
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187 if (ri->tokenType != ')') {
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188 // error
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189 }
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190 token(ri);
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191 }
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192 if (ri->tokenType == '*') {
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193 n = createNode(ri,'*',0,n,0);
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194 token(ri);
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195 }
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196
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197 return n;
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198 }
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199
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200 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
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201 NodePtr regex(RegexInfoPtr ri) {
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202 token(ri);
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203 NodePtr n = regexAtom(ri);
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204 while (ri->tokenType) {
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205 if (ri->tokenType == '*') {
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206 n = createNode(ri,'*',0,n,0);
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207 token(ri);
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208 return n;
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209 } else if (ri->tokenType == '|') {
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210 n = createNode(ri,'|',0,n,0);
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211 NodePtr n1 = regex(ri);
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212 n->right = n1;
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213 } else if (ri->tokenType == ')') {
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214 return n;
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215 } else {
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216 n = createNode(ri,'+',0,n,0);
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217 NodePtr n1 = regexAtom(ri);
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218 n->right = n1;
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219 }
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220 }
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221 return n;
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222 }