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annotate c/regexParser/regexParser.cc @ 121:aa266a4db47c pairPro

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merge
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 26 Nov 2015 21:17:26 +0900
parents 2f0653f8eabb 5d29b6a1b50f
children 188d866227a4
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include "regexParser.h"
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4 #include "error.h"
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5
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6 static NodePtr allocateNode();
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7 static NodePtr createNode(RegexInfoPtr,unsigned char*,NodePtr,NodePtr);
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8 static NodePtr charClass(RegexInfoPtr);
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9 static NodePtr group(RegexInfoPtr);
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10 static void token(RegexInfoPtr);
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11 static NodePtr regexAtom(RegexInfoPtr);
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12 NodePtr regex(RegexInfoPtr);
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13
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14 /**
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15 * Create a node of regex parse tree.
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16 * tokenType
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17 * regexPosition(state)
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18 * stateTransitionTable
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19 */
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20
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21 static
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22 NodePtr allocateNode() {
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23 NodePtr n = (NodePtr)malloc(sizeof(node));
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24 n->cc = (CharClassPtr)malloc(sizeof(CharClass));
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25 n->cc->cond = (ConditionList)malloc(sizeof(Condition));
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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 NodePtr createNode(RegexInfoPtr ri,unsigned char *character, NodePtr left, NodePtr right) {
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31 NodePtr n = allocateNode();
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32 if (n == NULL) {
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33 mallocFailedMessage();
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34 }
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35
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36 n->tokenType = ri->tokenType;
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37 n->left = left;
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38 n->right = right;
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39 n->nodeNumber = ri->nodeNumber;
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40 ri->nodeNumber++;
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41
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42 if (ri->tokenType == 'a') {
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43 ri->tokenType = 0;
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44 n->cc->cond->w = getWord(ri->tokenValue);
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45 ri->ptr += n->cc->cond->w->length-1;
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46 } else {
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47 WordPtr w = (WordPtr)malloc(sizeof(Word));
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48 w->word = character;
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49 w->length = 1;
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50 n->cc->cond->w = w;
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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 // <charClass> ::= '['<literal>'-'<literal>']'
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56 static
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57 NodePtr charClass(RegexInfoPtr ri) {
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58 NodePtr n = (NodePtr)malloc(sizeof(Node));
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59 if (n == NULL) {
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60 mallocFailedMessage();
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61 }
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62 while (ri->ptr[0] == '-') {
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63 ri->ptr++;
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64 }
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65 return n;
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66 }
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67
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68 // <literal> ::= [a-z][A-Z][0-9]
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69 static
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70 NodePtr literal(RegexInfoPtr ri) {
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71 NodePtr n = createNode(ri,ri->ptr,0,0);
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72 return n;
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73 }
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74
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75 // <group> ::= '('<regex>')'
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76 static
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77 NodePtr group(RegexInfoPtr ri) {
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78 return regex(ri);
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79 }
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80
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81 static
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82 void token(RegexInfoPtr ri) {
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83 while (ri->ptr[0] != '\0') {
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84 if (ri->ptr[0] == '('){
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85 ri->ptr++;
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86 ri->tokenType = '(';
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87 ri->tokenValue = NULL;
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88 if (ri->ptr[1] == ')') {
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89 ri->ptr++;
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90 }
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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 = ri->ptr;
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101 if (ri->ptr[1] == ']') {
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102 ri->ptr++;
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103 }
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104 return;
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105 } else if (ri->ptr[0] == '|'){
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106 ri->ptr++;
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107 ri->tokenType = '|';
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108 ri->tokenValue = NULL;
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109 return;
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110 } else if (ri->ptr[0] == '*'){
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111 ri->ptr++;
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112 ri->tokenType = '*';
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113 ri->tokenValue = NULL;
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114 return;
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115 } else if (ri->ptr[0] == '\\'){
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116 // need more proccesing
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117 /*
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118 \277
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119 \0xa5
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120 \[
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121 \\
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122 \utf-8 etc...
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123 */
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124 } else {
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125 ri->tokenType = 'a';
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126 ri->tokenValue = ri->ptr;
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127 ri->ptr++;
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128 return;
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129 }
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130 }
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131 return;
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132 }
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133
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134 // <regexAtom> ::= <literal>|<charClass>|<group>
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ec485345daf9 some function use static
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135 static
82
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136 NodePtr regexAtom(RegexInfoPtr ri) {
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137
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138 token(ri);
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139 NodePtr n = NULL;
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140 if (ri->tokenType == 'a') n = literal(ri);
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141 else if (ri->tokenType == '[') n = charClass(ri);
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142 else if (ri->tokenType == '(') n = group(ri);
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143
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144 return n;
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145 }
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146
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147 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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148 NodePtr regex(RegexInfoPtr ri) {
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149 NodePtr n = regexAtom(ri);
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150 while (ri->ptr[0]) {
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151 token(ri);
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152 if (ri->tokenType == '*') {
118
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153 unsigned char *syntax = (unsigned char*)malloc(sizeof(unsigned char));
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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154 syntax[0] = '*';
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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155 n = createNode(ri,syntax,n,0);
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156 } else if (ri->tokenType == '|') {
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157 NodePtr n1 = regex(ri);
118
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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158 unsigned char *syntax = (unsigned char*)malloc(sizeof(unsigned char));
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159 syntax[0] = '|';
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160 n = createNode(ri,syntax,n,n1);
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161 } else if (ri->tokenType == ')') {
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162 return n;
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163 } else {
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164 NodePtr n1 = regex(ri);
118
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165 unsigned char *syntax = (unsigned char*)malloc(sizeof(unsigned char));
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166 syntax[0] = '+';
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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167 n = createNode(ri,syntax,n,n1);
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168 }
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169 } return n;
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170 }