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annotate c/regexParser/main.cc @ 75:6541eae41a73

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fix group function
author masa
date Fri, 28 Aug 2015 18:40:33 +0900
parents b11dfc48f698
children d98a036441e2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
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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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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4 * <group> ::= '('<regex>')'
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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5 * <regexAtom> ::= <literal>|<charClass>|<group>
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
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6 * <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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7 */
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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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
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13 typedef struct charClass {
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14 unsigned char table[256];
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15 struct utf8Range {
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16 unsigned char *begin;
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17 unsigned char *end;
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18 struct utf8Range *next;
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19 } *rangeList;
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20 } CharClass, *CharClassPtr;
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21
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22 typedef struct node {
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23 unsigned char type;
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24 union value {
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25 charClass *cc;
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26 unsigned char character;
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27 } Value, *ValuePtr;
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28 struct node *self;
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29 struct node *parent;
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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 group();
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41 NodePtr orexp();
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42 NodePtr asterisk();
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43 NodePtr regex();
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44 NodePtr createNode(unsigned char,NodePtr,NodePtr);
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45 extern void token();
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46 extern NodePtr regexAtom();
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47
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48
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49 bool isLiteral(char c) {
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50 if (*ptr > 0x7f) return true;
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51 else if (*ptr == '(') return false;
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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 return true;
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56 }
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58 NodePtr createNode(unsigned char character, NodePtr left, NodePtr right) {
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59 NodePtr n = (NodePtr)malloc(sizeof(Node));
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60 n->self = n;
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61 n->Value.character = character;
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62 n->left = left;
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63 n->right = right;
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64 return n;
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65 }
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66
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67 // <charClass> ::= '['<literal>'-'<literal>']'
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68 NodePtr charClass() {
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69 NodePtr n = (NodePtr)malloc(sizeof(Node));
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70 unsigned char startChar = *ptr;
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71 while (*ptr == '-') {
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72 ptr++;
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73 }
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74 unsigned char endChar = *ptr;
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75 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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76
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77 return n;
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78 }
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79
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80 // <literal> ::= [a-z][A-Z][0-9]
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81 NodePtr literal() {
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82 NodePtr n = createNode(*ptr,0,0);
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83 ptr++;
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84 return n;
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85 }
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86
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87 // <group> ::= '('<regex>')'
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88 NodePtr group() {
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89 return regex();
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90 }
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91
55
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92
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93
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94 void token() {
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95 while (*ptr != '\0') {
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96 if (*ptr == '('){
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97 ptr++;
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98 tokenType = '(';
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99 tokenValue = 0;
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100 if (ptr[1] == ')') {
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101 ptr++;
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102 }
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103 return;
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104 } else if (*ptr == ')') {
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105 ptr++;
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106 tokenType = ')';
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107 tokenValue = *ptr;
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108 return;
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109 } else if (*ptr == '[') {
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110 ptr++;
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111 tokenType = '[';
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112 tokenValue = *ptr;
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113 if (ptr[1] == ']') {
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114 ptr++;
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115 }
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116 return;
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117 } else if (*ptr == '|'){
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118 ptr++;
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119 tokenType = '|';
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120 tokenValue = 0;
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121 return;
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122 } else if (*ptr == '*'){
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123 ptr++;
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124 tokenType = '*';
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125 tokenValue = 0;
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126 return;
73
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127 } else if (*ptr == '\\'){
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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128 // need more proccesing
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129 /*
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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130 \277
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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131 \0xa5
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132 \[
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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133 \\
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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134 \utf-8 etc...
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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135 */
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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136 } else {
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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137 tokenType = 'a';
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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138 tokenValue = *ptr;
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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139 return;
56
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140 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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141 }
71
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142
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143 tokenType = 0;
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144 tokenValue = 0;
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145 return;
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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146 }
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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147
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148 // <regexAtom> ::= <literal>|<charClass>|<group>
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149 NodePtr regexAtom() {
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150
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151 token();
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152 NodePtr n = NULL;
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153 if (tokenType == 'a') n = literal();
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154 else if (tokenType == '[') n = charClass();
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155 else if (tokenType == '(') n = group();
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156
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157 return n;
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158 }
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159
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160 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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161 NodePtr regex() {
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162 NodePtr n = regexAtom();
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163 while (*ptr) {
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parents: 63
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164 token();
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165 if (tokenType == '*') {
71
58d2b10988c9 move ptr++ in token()
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parents: 70
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166 n = createNode('*',n,0);
64
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167 } else if (tokenType == '|') {
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168 NodePtr n1 = regex();
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169 n = createNode('|',n,n1);
74
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masa
parents: 73
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170 } else if (tokenType == ')') {
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masa
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171 return n;
64
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172 } else {
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173 NodePtr n1 = regex();
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174 n = createNode('+',n,n1);
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175 }
67
4842ca2cf8ee print character
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parents: 66
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176 } return n;
68
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177 }
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parents: 67
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178
69
eecddded9b91 implement printTree
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 68
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179 void descendTree(NodePtr n) {
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parents: 68
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180 static int d = 0;
68
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parents: 67
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181 if (n->right != NULL) {
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182 d++;
69
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183 descendTree(n->right);
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184 d--;
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185 }
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186 printf("%*c%c\n",d*4, ' ',n->Value.character);
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parents: 68
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187 if (n->left != NULL) {
68
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188 d++;
69
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189 descendTree(n->left);
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190 d--;
68
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191 }
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parents: 67
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192 }
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parents: 67
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193
66
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
194 void printTree(NodePtr n) {
72
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parents: 71
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195 puts("---Print Node----");
69
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parents: 68
diff changeset
196 descendTree(n);
72
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parents: 71
diff changeset
197 puts("-----------------");
66
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parents: 65
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198 }
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parents: 65
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199
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
200
62
a49b4a8b8c14 implement isLiteral
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 61
diff changeset
201 int main(int argc, char **argv)
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
202 {
56
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
203 for (int i = 1; i < argc; i++) {
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parents: 55
diff changeset
204 if (strcmp(argv[i],"-regex") == 0) {
64
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parents: 63
diff changeset
205 ptr = (unsigned char*)argv[i+1]; i++;
56
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parents: 55
diff changeset
206 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
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207 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
208
56
8901bc071d33 implement string() and literal()
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parents: 55
diff changeset
209 printf("regex : %s\n",ptr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
210 NodePtr n = regex();
66
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
211 printTree(n);
45
89a198fa6b23 add dfrTobin
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 return 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 }