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annotate c/regexParser/main.cc @ 65:20b7d4e958bb

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fix
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 30 Jul 2015 23:55:53 +0900
parents e0ad6c145f89
children f8fb3b463f70
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 * <string> ::= <literal><literal>*
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5 * <group> ::= '('<regex>')'
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6 * <or> ::= <regex>'|'<regex>
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7 * <*> ::= <regex>'*'
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8 * <regex> ::= <string>|<or>|<charClass>|<group>|<*>
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9 */
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10
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14
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15 typedef struct charClass {
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16 unsigned char table[256];
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17 struct utf8Range {
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18 unsigned char *begin;
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19 unsigned char *end;
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20 struct utf8Range *next;
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21 } *rangeList;
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22 } CharClass, *CharClassPtr;
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23
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24 typedef struct node {
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25 unsigned char type;
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26 union value {
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27 charClass *cc;
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28 unsigned char *string;
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29 };
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30 struct node *self;
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31 struct node *left;
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32 struct node *right;
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33 } Node, *NodePtr;
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34
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35 unsigned char *ptr;
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36 unsigned char tokenType;
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37 int tokenValue;
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38 NodePtr regexHeadNode;
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39
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40 NodePtr charClass();
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41 NodePtr string();
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42 NodePtr group();
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43 NodePtr orexp();
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44 NodePtr asterisk();
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45 NodePtr regex();
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46 NodePtr createNode(char,NodePtr,NodePtr);
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47 extern void token();
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48 extern NodePtr regexAtom();
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49
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50
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51 bool isLiteral(char c) {
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52 if (*ptr > 0x7f) return true;
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53 else if (*ptr == '(') return false;
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54 else if (*ptr == '[') return false;
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55 else if (*ptr == '|') return false;
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56 else if (*ptr == '*') return false;
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57 return true;
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58 }
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59
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60 void printNodeDate(NodePtr n) {
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61 puts("---------------------");
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62 // printf("Self Node char : %c\n", n->character);
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63 printf("Self Node addr : %p\n", n->self);
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64 printf("left Node addr : %p\n", n->left);
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65 printf("right Node addr : %p\n", n->right);
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66 puts("---------------------");
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67 puts("");
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68 }
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69
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70 NodePtr createNode(char character, NodePtr left, NodePtr right) {
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71 NodePtr n = (NodePtr)malloc(sizeof(Node));
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72 n->self = n;
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73 // n->character = character;
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74 n->left = left;
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75 n->right = right;
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76
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77 printNodeDate(n);
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78 return n;
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79 }
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80
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81 // <charClass> ::= '['<literal>'-'<literal>']'
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82 NodePtr charClass() {
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83 ptr++;
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84 NodePtr n = (NodePtr)malloc(sizeof(Node));
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85 return n;
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86 }
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87
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88 // <literal> ::= [a-z][A-Z][0-9]
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89 NodePtr literal() {
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90 NodePtr n = createNode(*ptr,0,0);
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91 ptr++;
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92 return n;
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93 }
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94
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95 // <string> ::= <literal><literal>*
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96 NodePtr string() {
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97 char c = *ptr;
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98 NodePtr n = NULL;
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99 if (isLiteral(c)) {
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100 n = createNode(0,literal(),string());
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101 } else {
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102 n = createNode(0,0,0);
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103 }
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104 return n;
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105 }
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106
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107 // <group> ::= '('<regex>')'
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108 NodePtr group() {
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109 token();
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110 NodePtr n = regex();
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111 token();
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112 if (*ptr == ')') {
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113 n = createNode('(',n,0);
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114 } else {
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115 // ) reqiured
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116 }
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117 return n;
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118 }
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119
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120
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121 void token() {
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122 while (*ptr != '\0') {
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123 if ((*ptr == '(') || (*ptr == ')')) {
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124 tokenType = *ptr++;
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125 tokenValue = 0;
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126 return ;
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127 } else if (*ptr == '[') {
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128 tokenType = '[';
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129 tokenValue = *ptr;
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130 if (ptr[1] == ']') {
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131 ptr++;
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132 }
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133 while (*ptr != ']') ptr++;
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134 ptr++;
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135 return;
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136 } else if (*ptr == '|'){
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137 tokenType = '|';
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138 tokenValue = 0;
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139 return;
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140 } else if (*ptr == '*'){
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141 tokenType = '*';
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142 tokenValue = 0;
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143 return;
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144 }
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145
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146 tokenType = 'a';
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147 tokenValue = *ptr;
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148 return;
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149
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150 if (*ptr == '\\') ptr++; // need more proccesing
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151 /*
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152 \277
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153 \0xa5
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154 \[
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155 \\
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156 \utf-8 etc...
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157 */
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158
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159 }
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160 }
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161
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162 // <regexAtom> ::= <literal>|<charClass>|<group>
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163 NodePtr regexAtom() {
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164
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165 token();
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166 NodePtr n = NULL;
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167 if (tokenType == 'a') n = literal();
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168 else if (tokenType == '[') n = charClass();
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169 else if (tokenType == '(') n = group();
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170
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171 return n;
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172 }
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173
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174 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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175 NodePtr regex() {
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176 NodePtr n = regexAtom();
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177 while (*ptr) {
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178 token();
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179 if (tokenType == '*') {
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180 n = createNode('*',n,0);
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181 } else if (tokenType == '|') {
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182 NodePtr n1 = regex();
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183 n = createNode('|',n,n1);
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184 } else {
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185 NodePtr n1 = regex();
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186 n = createNode('+',n,n1);
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187 }
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188 }
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189 return n;
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190 }
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191
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192
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193 int main(int argc, char **argv)
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194 {
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195 for (int i = 1; i < argc; i++) {
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196 if (strcmp(argv[i],"-regex") == 0) {
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197 ptr = (unsigned char*)argv[i+1]; i++;
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198 }
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199 }
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200
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201 printf("regex : %s\n",ptr);
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202 NodePtr n = regex();
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203 return 0;
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204 }