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annotate c/regexParser/main.cc @ 80:0a452d69f0e2

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remove global variable in main.cc
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Wed, 07 Oct 2015 16:08:34 +0900
parents 52da06c3f050
children 27883946b2dc
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 typedef struct regexInfo {
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15 unsigned char *ptr;
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16 unsigned char tokenType;
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17 int tokenValue;
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18 } RegexInfo, *RegexInfoPtr;
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19
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20 NodePtr charClass();
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21 NodePtr group();
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22 NodePtr regex(RegexInfoPtr);
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23 NodePtr createNode(unsigned char,NodePtr,NodePtr);
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24 void token();
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25 NodePtr regexAtom();
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26 extern void printTree(NodePtr);
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27
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28 /**
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29 * Create a node of regex parse tree.
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30 * tokenType
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31 * regexPosition(state)
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32 * stateTransitionTable
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33 */
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34 NodePtr createNode(unsigned char character, NodePtr left, NodePtr right) {
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35 NodePtr n = (NodePtr)malloc(sizeof(Node));
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36 n->self = n;
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37 n->Value.character = character;
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38 n->left = left;
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39 n->right = right;
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40 return n;
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41 }
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42
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43 // <charClass> ::= '['<literal>'-'<literal>']'
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44 NodePtr charClass(RegexInfoPtr ri) {
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45 NodePtr n = (NodePtr)malloc(sizeof(Node));
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46 unsigned char startChar = ri->ptr[0];
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47 while (ri->ptr[0] == '-') {
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48 ri->ptr++;
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49 }
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50 unsigned char endChar = ri->ptr[0];
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51 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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52
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53 return n;
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54 }
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55
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56 // <literal> ::= [a-z][A-Z][0-9]
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57 NodePtr literal(RegexInfoPtr ri) {
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58 NodePtr n = createNode(ri->ptr[0],0,0);
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59 ri->ptr++;
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60 return n;
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61 }
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62
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63 // <group> ::= '('<regex>')'
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64 NodePtr group(RegexInfoPtr ri) {
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65 return regex(ri);
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66 }
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70 void token(RegexInfoPtr ri) {
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71 while (ri->ptr[0] != '\0') {
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72 if (ri->ptr[0] == '('){
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73 ri->ptr++;
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74 ri->tokenType = '(';
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75 ri->tokenValue = 0;
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76 if (ri->ptr[1] == ')') {
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77 ri->ptr++;
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78 }
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79 return;
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80 } else if (ri->ptr[0] == ')') {
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81 ri->ptr++;
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82 ri->tokenType = ')';
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83 ri->tokenValue = ri->ptr[0];
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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 if (ri->ptr[1] == ']') {
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90 ri->ptr++;
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91 }
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92 return;
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93 } else if (ri->ptr[0] == '|'){
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94 ri->ptr++;
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95 ri->tokenType = '|';
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96 ri->tokenValue = 0;
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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 = 0;
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102 return;
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103 } else if (ri->ptr[0] == '\\'){
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104 // need more proccesing
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105 /*
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106 \277
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107 \0xa5
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108 \[
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109 \\
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110 \utf-8 etc...
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111 */
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112 } else {
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113 ri->tokenType = 'a';
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114 ri->tokenValue = ri->ptr[0];
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115 return;
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116 }
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117 }
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118
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119 ri->tokenType = 0;
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120 ri->tokenValue = 0;
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121 return;
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122 }
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123
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124 // <regexAtom> ::= <literal>|<charClass>|<group>
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125 NodePtr regexAtom(RegexInfoPtr ri) {
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126
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127 token(ri);
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128 NodePtr n = NULL;
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129 if (ri->tokenType == 'a') n = literal(ri);
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130 else if (ri->tokenType == '[') n = charClass(ri);
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131 else if (ri->tokenType == '(') n = group(ri);
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132
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133 return n;
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134 }
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135
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136 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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137 NodePtr regex(RegexInfoPtr ri) {
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138 NodePtr n = regexAtom(ri);
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139 while (ri->ptr[0]) {
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140 token(ri);
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141 if (ri->tokenType == '*') {
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142 n = createNode('*',n,0);
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143 } else if (ri->tokenType == '|') {
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144 NodePtr n1 = regex(ri);
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145 n = createNode('|',n,n1);
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146 } else if (ri->tokenType == ')') {
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147 return n;
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148 } else {
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149 NodePtr n1 = regex(ri);
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150 n = createNode('+',n,n1);
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151 }
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152 } return n;
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153 }
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154
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155
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156 int main(int argc, char **argv)
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157 {
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158 RegexInfoPtr ri = (RegexInfoPtr)malloc(sizeof(RegexInfo));
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159
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160 for (int i = 1; i < argc; i++) {
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161 if (strcmp(argv[i],"-regex") == 0) {
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162 ri->ptr = (unsigned char*)argv[i+1]; i++;
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163 }
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164 }
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165
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166 printf("regex : %s\n",ri->ptr);
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167 NodePtr n = regex(ri);
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168 printTree(n);
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169 return 0;
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170 }