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annotate c/regexParser/regexParser.cc @ 119:2f0653f8eabb pairPro

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fix
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 26 Nov 2015 18:05:39 +0900
parents 66c633575b53
children aa266a4db47c
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 "regexParser.h"
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4 #include "error.h"
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5
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6 static NodePtr createNode(RegexInfoPtr,NodePtr,NodePtr);
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7 static NodePtr charClass(RegexInfoPtr);
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8 static NodePtr group(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 NodePtr allocateNode() {
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21 NodePtr n = (NodePtr)malloc(sizeof(node));
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22 n->cc = (CharClassPtr)malloc(sizeof(CharClass));
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23 n->cc->cond = (ConditionList)malloc(sizeof(Condition));
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24 return n;
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25 }
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26
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27 static
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28 NodePtr createNode(RegexInfoPtr ri, NodePtr left, NodePtr right) {
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29 NodePtr n = allocateNode();
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30 if (n == NULL) {
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31 mallocFailedMessage();
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32 }
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33
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34 n->tokenType = ri->tokenType;
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35 n->cc->cond->character = ri->tokenValue;
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36 n->left = left;
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37 n->right = right;
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38
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39 if (ri->tokenType == 'a') {
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40 n->nodeNumber = ri->nodeNumber;
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41 ri->nodeNumber++;
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42 ri->tokenType = 0;
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43 }
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44 return n;
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45 }
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46
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47 // <charClass> ::= '['<literal>'-'<literal>']'
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48 static
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49 NodePtr charClass(RegexInfoPtr ri) {
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50 NodePtr n = (NodePtr)malloc(sizeof(Node));
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51 if (n == NULL) {
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52 mallocFailedMessage();
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53 }
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54 while (ri->ptr[0] == '-') {
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55 ri->ptr++;
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56 }
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57 return n;
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58 }
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59
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60 // <literal> ::= [a-z][A-Z][0-9]
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61 static
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62 NodePtr literal(RegexInfoPtr ri) {
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63 NodePtr n = createNode(ri,0,0);
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64 ri->ptr++;
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65 return n;
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66 }
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67
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68 // <group> ::= '('<regex>')'
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69 static
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70 NodePtr group(RegexInfoPtr ri) {
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71 return regex(ri);
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72 }
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74 static
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75 void token(RegexInfoPtr ri) {
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76 while (ri->ptr[0] != '\0') {
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77 if (ri->ptr[0] == '('){
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78 ri->ptr++;
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79 ri->tokenType = '(';
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80 ri->tokenValue = 0;
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81 if (ri->ptr[1] == ')') {
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82 ri->ptr++;
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83 }
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84 return;
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85 } else if (ri->ptr[0] == ')') {
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86 ri->ptr++;
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87 ri->tokenType = ')';
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88 ri->tokenValue = ri->ptr[0];
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89 return;
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90 } else if (ri->ptr[0] == '[') {
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91 ri->ptr++;
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92 ri->tokenType = '[';
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93 ri->tokenValue = ri->ptr[0];
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94 if (ri->ptr[1] == ']') {
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95 ri->ptr++;
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96 }
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97 return;
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98 } else if (ri->ptr[0] == '|'){
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99 ri->ptr++;
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100 ri->tokenType = '|';
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101 ri->tokenValue = '|';
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102 return;
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103 } else if (ri->ptr[0] == '*'){
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104 ri->ptr++;
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105 ri->tokenType = '*';
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106 ri->tokenValue = '*';
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107 return;
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108 } else if (ri->ptr[0] == '\\'){
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109 // need more proccesing
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110 /*
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111 \277
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112 \0xa5
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113 \[
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114 \\
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115 \utf-8 etc...
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116 */
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117 } else {
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118 ri->tokenType = 'a';
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119 ri->tokenValue = ri->ptr[0];
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120 return;
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121 }
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122 }
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123 ri->tokenType = 0;
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124 ri->tokenValue = 0;
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125 return;
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126 }
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127
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128 // <regexAtom> ::= <literal>|<charClass>|<group>
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129 static
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130 NodePtr regexAtom(RegexInfoPtr ri) {
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131
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132 token(ri);
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133 NodePtr n = NULL;
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134 if (ri->tokenType == 'a') n = literal(ri);
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135 else if (ri->tokenType == '[') n = charClass(ri);
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136 else if (ri->tokenType == '(') n = group(ri);
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137
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138 return n;
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139 }
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140
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141 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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142 NodePtr regex(RegexInfoPtr ri) {
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143 NodePtr n = regexAtom(ri);
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144 while (ri->ptr[0]) {
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145 token(ri);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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146 if (ri->tokenType == '*') {
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147 n = createNode(ri,n,0);
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148 } else if (ri->tokenType == '|') {
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149 NodePtr n1 = regex(ri);
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150 ri->tokenValue = '|';
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151 n = createNode(ri,n,n1);
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152 } else if (ri->tokenType == ')') {
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153 return n;
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154 } else {
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155 NodePtr n1 = regex(ri);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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156 ri->tokenValue = '+';
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157 n = createNode(ri,n,n1);
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158 }
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159 } return n;
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160 }