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annotate c/regexParser/main.cc @ 81:27883946b2dc

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author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Wed, 07 Oct 2015 16:47:03 +0900
parents 0a452d69f0e2
children 1d9bbf922bb6
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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1 /*
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2 * <literal> ::= [a-z][A-Z][0-9]
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3 * <charClass> ::= '['<literal>'-'<literal>']'
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4 * <group> ::= '('<regex>')'
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5 * <regexAtom> ::= <literal>|<charClass>|<group>
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6 * <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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7 */
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8
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include "regexParser.h"
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13
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14 NodePtr createNode(unsigned char,NodePtr,NodePtr);
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15 NodePtr charClass(RegexInfoPtr);
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16 NodePtr group(RegexInfoPtr);
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17 void token(RegexInfoPtr);
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18 NodePtr regexAtom(RegexInfoPtr);
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19 NodePtr regex(RegexInfoPtr);
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20 extern void printTree(NodePtr);
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21
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22 /**
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23 * Create a node of regex parse tree.
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24 * tokenType
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25 * regexPosition(state)
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26 * stateTransitionTable
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27 */
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28 NodePtr createNode(unsigned char character, NodePtr left, NodePtr right) {
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29 NodePtr n = (NodePtr)malloc(sizeof(Node));
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30 n->self = n;
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31 n->Value.character = character;
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32 n->left = left;
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33 n->right = right;
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34 return n;
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35 }
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36
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37 // <charClass> ::= '['<literal>'-'<literal>']'
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38 NodePtr charClass(RegexInfoPtr ri) {
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39 NodePtr n = (NodePtr)malloc(sizeof(Node));
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40 unsigned char startChar = ri->ptr[0];
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41 while (ri->ptr[0] == '-') {
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42 ri->ptr++;
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43 }
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44 unsigned char endChar = ri->ptr[0];
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45 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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46
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47 return n;
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48 }
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49
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50 // <literal> ::= [a-z][A-Z][0-9]
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51 NodePtr literal(RegexInfoPtr ri) {
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52 NodePtr n = createNode(ri->ptr[0],0,0);
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53 ri->ptr++;
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54 return n;
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55 }
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56
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57 // <group> ::= '('<regex>')'
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58 NodePtr group(RegexInfoPtr ri) {
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59 return regex(ri);
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60 }
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64 void token(RegexInfoPtr ri) {
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65 while (ri->ptr[0] != '\0') {
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66 if (ri->ptr[0] == '('){
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67 ri->ptr++;
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68 ri->tokenType = '(';
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69 ri->tokenValue = 0;
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70 if (ri->ptr[1] == ')') {
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71 ri->ptr++;
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72 }
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73 return;
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74 } else if (ri->ptr[0] == ')') {
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75 ri->ptr++;
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76 ri->tokenType = ')';
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77 ri->tokenValue = ri->ptr[0];
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78 return;
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79 } else if (ri->ptr[0] == '[') {
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80 ri->ptr++;
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81 ri->tokenType = '[';
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82 ri->tokenValue = ri->ptr[0];
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83 if (ri->ptr[1] == ']') {
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84 ri->ptr++;
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85 }
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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 = 0;
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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 = 0;
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96 return;
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97 } else if (ri->ptr[0] == '\\'){
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98 // need more proccesing
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99 /*
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100 \277
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101 \0xa5
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102 \[
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103 \\
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104 \utf-8 etc...
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105 */
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106 } else {
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107 ri->tokenType = 'a';
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108 ri->tokenValue = ri->ptr[0];
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109 return;
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110 }
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111 }
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112
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113 ri->tokenType = 0;
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114 ri->tokenValue = 0;
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115 return;
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116 }
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117
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118 // <regexAtom> ::= <literal>|<charClass>|<group>
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119 NodePtr regexAtom(RegexInfoPtr ri) {
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120
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121 token(ri);
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122 NodePtr n = NULL;
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123 if (ri->tokenType == 'a') n = literal(ri);
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124 else if (ri->tokenType == '[') n = charClass(ri);
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125 else if (ri->tokenType == '(') n = group(ri);
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126
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127 return n;
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128 }
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129
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130 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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131 NodePtr regex(RegexInfoPtr ri) {
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132 NodePtr n = regexAtom(ri);
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133 while (ri->ptr[0]) {
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134 token(ri);
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135 if (ri->tokenType == '*') {
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58d2b10988c9 move ptr++ in token()
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136 n = createNode('*',n,0);
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137 } else if (ri->tokenType == '|') {
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138 NodePtr n1 = regex(ri);
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139 n = createNode('|',n,n1);
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140 } else if (ri->tokenType == ')') {
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masa
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141 return n;
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142 } else {
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143 NodePtr n1 = regex(ri);
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144 n = createNode('+',n,n1);
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145 }
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146 } return n;
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147 }
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148
66
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149
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150 int main(int argc, char **argv)
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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151 {
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152 RegexInfoPtr ri = (RegexInfoPtr)malloc(sizeof(RegexInfo));
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153
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154 for (int i = 1; i < argc; i++) {
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155 if (strcmp(argv[i],"-regex") == 0) {
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156 ri->ptr = (unsigned char*)argv[i+1]; i++;
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157 }
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158 }
55
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159
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160 printf("regex : %s\n",ri->ptr);
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161 NodePtr n = regex(ri);
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162 printTree(n);
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parents:
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163 return 0;
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parents:
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164 }