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annotate c/regexParser/main.cc @ 66:f8fb3b463f70

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fix when '|' come procces
author Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
date Tue, 04 Aug 2015 16:41:41 +0900
parents 20b7d4e958bb
children 4842ca2cf8ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 * <string> ::= <literal><literal>*
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5 * <group> ::= '('<regex>')'
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6 * <regexAtom> ::= <literal>|<charClass>|<group>
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7 * <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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8 */
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13
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14 typedef struct charClass {
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15 unsigned char table[256];
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16 struct utf8Range {
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17 unsigned char *begin;
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18 unsigned char *end;
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19 struct utf8Range *next;
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20 } *rangeList;
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21 } CharClass, *CharClassPtr;
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22
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23 typedef struct node {
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24 unsigned char type;
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25 union value {
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26 charClass *cc;
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27 unsigned char *string;
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28 };
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29 struct node *self;
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30 struct node *left;
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31 struct node *right;
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32 } Node, *NodePtr;
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33
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34 unsigned char *ptr;
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35 unsigned char tokenType;
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36 int tokenValue;
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37 NodePtr regexHeadNode;
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38
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39 NodePtr charClass();
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40 NodePtr string();
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41 NodePtr group();
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42 NodePtr orexp();
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43 NodePtr asterisk();
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44 NodePtr regex();
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45 NodePtr createNode(char,NodePtr,NodePtr);
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46 extern void token();
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47 extern NodePtr regexAtom();
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48
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49
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50 bool isLiteral(char c) {
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51 if (*ptr > 0x7f) return true;
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52 else if (*ptr == '(') return false;
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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 return true;
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57 }
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58
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59 void printNodeDate(NodePtr n) {
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60 puts("---------------------");
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61 // printf("Self Node char : %c\n", n->character);
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62 printf("Self Node addr : %p\n", n->self);
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63 printf("left Node addr : %p\n", n->left);
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64 printf("right Node addr : %p\n", n->right);
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65 puts("---------------------");
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66 puts("");
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67 }
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68
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69 NodePtr createNode(char character, NodePtr left, NodePtr right) {
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70 NodePtr n = (NodePtr)malloc(sizeof(Node));
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71 n->self = n;
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72 // n->character = character;
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73 n->left = left;
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74 n->right = right;
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75
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76 printNodeDate(n);
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77 return n;
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78 }
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79
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80 // <charClass> ::= '['<literal>'-'<literal>']'
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81 NodePtr charClass() {
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82 ptr++;
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83 NodePtr n = (NodePtr)malloc(sizeof(Node));
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84 return n;
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85 }
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86
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87 // <literal> ::= [a-z][A-Z][0-9]
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88 NodePtr literal() {
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89 NodePtr n = createNode(*ptr,0,0);
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90 ptr++;
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91 return n;
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92 }
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93
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94 // <string> ::= <literal><literal>*
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95 NodePtr string() {
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96 char c = *ptr;
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97 NodePtr n = NULL;
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98 if (isLiteral(c)) {
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99 n = createNode(0,literal(),string());
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100 } else {
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101 n = createNode(0,0,0);
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102 }
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103 return n;
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104 }
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105
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106 // <group> ::= '('<regex>')'
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107 NodePtr group() {
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108 token();
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109 NodePtr n = regex();
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110 token();
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111 if (*ptr == ')') {
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112 n = createNode('(',n,0);
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113 } else {
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114 // ) reqiured
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115 }
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116 return n;
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117 }
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118
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119
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120 void token() {
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121 while (*ptr != '\0') {
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122 if ((*ptr == '(') || (*ptr == ')')) {
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123 tokenType = *ptr++;
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124 tokenValue = 0;
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125 return ;
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126 } else if (*ptr == '[') {
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127 tokenType = '[';
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128 tokenValue = *ptr;
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129 if (ptr[1] == ']') {
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130 ptr++;
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131 }
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132 while (*ptr != ']') ptr++;
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133 ptr++;
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134 return;
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135 } else if (*ptr == '|'){
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136 tokenType = '|';
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137 tokenValue = 0;
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138 return;
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139 } else if (*ptr == '*'){
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140 tokenType = '*';
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141 tokenValue = 0;
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142 return;
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143 }
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144
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145 tokenType = 'a';
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146 tokenValue = *ptr;
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147 return;
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148
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149 if (*ptr == '\\') ptr++; // need more proccesing
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150 /*
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151 \277
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152 \0xa5
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153 \[
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154 \\
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155 \utf-8 etc...
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156 */
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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 // <regexAtom> ::= <literal>|<charClass>|<group>
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162 NodePtr regexAtom() {
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163
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164 token();
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165 NodePtr n = NULL;
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166 if (tokenType == 'a') n = literal();
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167 else if (tokenType == '[') n = charClass();
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168 else if (tokenType == '(') n = group();
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169
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170 return n;
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171 }
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172
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173 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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174 NodePtr regex() {
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175 NodePtr n = regexAtom();
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176 while (*ptr) {
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177 token();
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178 if (tokenType == '*') {
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179 n = createNode('*',n,0); ptr++;
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180 } else if (tokenType == '|') {
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181 ptr++;
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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 /*
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194 * e.g.
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195 *
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196 * % ./regexParser -regex abc
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197 *
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198 * #-c
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199 * #-+
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200 * # #-b
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201 * +
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202 * #-a
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203 *
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204 * % ./regexParser -regex (a*|bc)d
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205 *
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206 *
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207 * #-d
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208 * +
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209 * # #-c
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210 * # #-+
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211 * # # #-b
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212 * #-|
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213 * #
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214 * #-*
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215 * #-a
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216 *
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217 */
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218 void printTree(NodePtr n) {
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219
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220 }
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221
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222
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223 int main(int argc, char **argv)
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224 {
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225 for (int i = 1; i < argc; i++) {
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226 if (strcmp(argv[i],"-regex") == 0) {
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227 ptr = (unsigned char*)argv[i+1]; i++;
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228 }
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229 }
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230
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231 printf("regex : %s\n",ptr);
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232 NodePtr n = regex();
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233 printTree(n);
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234 return 0;
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235 }