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annotate regexParser/regexParser.cc @ 308:1188debbef10

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separate CharClass
author Shinji KONO <kono@ie.u-ryukyu.ac.jp>
date Mon, 08 Feb 2016 12:45:45 +0900
parents 3e78631a6222
children a4484c02cba5
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 "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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12 /**
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13 * Create a node of regex parse tree.
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14 * tokenType
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15 * regexPosition(state)
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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 token(ri);
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75 NodePtr n = createNode(ri,'a',cc,0,0);
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76 return n;
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77 }
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79 static
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80 void token(RegexInfoPtr ri) {
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81 while (ri->ptr[0] != '\0') {
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82 if (ri->ptr[0] == '('){
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83 ri->ptr++;
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84 ri->tokenType = '(';
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85 ri->tokenValue = NULL;
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86 return;
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87 } else if (ri->ptr[0] == ')') {
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88 ri->ptr++;
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89 ri->tokenType = ')';
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90 ri->tokenValue = ri->ptr;
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91 return;
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92 } else if (ri->ptr[0] == ']') {
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93 ri->ptr++;
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94 ri->tokenType = ']';
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95 ri->tokenValue = ri->ptr;
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96 return;
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97 } else if (ri->ptr[0] == '|'){
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98 ri->ptr++;
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99 ri->tokenType = '|';
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100 ri->tokenValue = NULL;
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101 return;
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102 } else 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 // need more proccesing
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109 /*
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110 \277
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111 \0xa5
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112 \[
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113 \\
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114 \utf-8 etc...
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115 */
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116 ri->ptr++;
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117 ri->tokenType = 'a';
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118 ri->tokenValue = ri->ptr;
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119 ri->ptr++;
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120 return;
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121 } else if (ri->ptr[0] == '[') {
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122 ri->ptr++;
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123 ri->tokenType = 'c';
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124 ri->tokenValue = ri->ptr;
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125 return;
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126 } else {
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127 ri->tokenType = 'a';
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128 ri->tokenValue = ri->ptr;
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129 // if (isalnum(ri->ptr[0])) {
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130 ri->ptr++;
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131 // }
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132 return;
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133 }
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134 }
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135 ri->tokenType = 0;
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136 ri->tokenValue = NULL;
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137 return;
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138 }
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139
130
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140 // <regexAtom> ::= <literal>|<charClass>|<group>
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141 static
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142 NodePtr regexAtom(RegexInfoPtr ri) {
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143
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144 NodePtr n = NULL;
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145 if (ri->tokenType == 'c') n = charClass(ri);
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146 else if (ri->tokenType == 'a') n = literal(ri);
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147 else if (ri->tokenType == '(') {
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148 n = regex(ri);
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149 if (ri->tokenType != ')') {
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150 // error
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151 fprintf(stderr,"unclosed ')' before %s \n", ri->ptr);
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152 return createNode(ri,0,0,0,0);
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153 }
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154 token(ri);
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155 }
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156 if (ri->tokenType == '*') {
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157 n = createNode(ri,'*',0,n,0);
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158 token(ri);
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159 }
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160 return n;
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161 }
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162
133
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163 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
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164 NodePtr regex(RegexInfoPtr ri) {
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165 token(ri);
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166 NodePtr n = regexAtom(ri);
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167 while (ri->tokenType) {
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168 if (ri->tokenType == '*') {
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169 n = createNode(ri,'*',0,n,0);
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170 token(ri);
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171 return n;
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172 } else if (ri->tokenType == '|') {
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173 n = createNode(ri,'|',0,n,0);
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174 NodePtr n1 = regex(ri);
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175 n->right = n1;
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176 } else if (ri->tokenType == ')') {
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177 return n;
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178 } else if (ri->tokenType == ']') {
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179 // error
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180 return n;
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181 } else {
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182 n = createNode(ri,'+',0,n,0);
180
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183 NodePtr n1 = regexAtom(ri);
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184 n->right = n1;
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185 }
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186 }
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187 return n;
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188 }