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annotate c/regexParser/main.cc @ 76:d98a036441e2

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add createNode comment
author masa
date Fri, 28 Aug 2015 20:36:16 +0900
parents 6541eae41a73
children 7f53a587bf97
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
55
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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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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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 */
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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 node {
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14 unsigned char type;
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15 union value {
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16 charClass *cc;
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17 unsigned char character;
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18 } Value, *ValuePtr;
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19 struct node *self;
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20 struct node *parent;
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21 struct node *left;
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22 struct node *right;
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23 } Node, *NodePtr;
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24
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25 typedef struct charClass {
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26 NodePtr nextState[256];
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27 struct utf8Range {
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28 unsigned char *begin;
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29 unsigned char *end;
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30 struct utf8Range *next;
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31 NodePtr nextState;
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32 } *rangeList;
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33 } CharClass, *CharClassPtr;
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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 group();
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42 NodePtr regex();
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43 NodePtr createNode(unsigned char,NodePtr,NodePtr);
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44 void token();
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45 NodePtr regexAtom();
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46
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47
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48 bool isLiteral(char c) {
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49 if (*ptr > 0x7f) return true;
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50 else if (*ptr == '(') return false;
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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 return true;
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55 }
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56
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57 /**
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58 * Create a node of regex parse tree.
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59 * tokenType
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60 * regexPosition(state)
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61 * stateTransitionTable
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62 */
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63 NodePtr createNode(unsigned char character, NodePtr left, NodePtr right) {
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64 NodePtr n = (NodePtr)malloc(sizeof(Node));
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65 n->self = n;
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66 n->Value.character = character;
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67 n->left = left;
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68 n->right = right;
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69 return n;
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70 }
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71
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72 // <charClass> ::= '['<literal>'-'<literal>']'
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73 NodePtr charClass() {
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74 NodePtr n = (NodePtr)malloc(sizeof(Node));
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75 unsigned char startChar = *ptr;
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76 while (*ptr == '-') {
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77 ptr++;
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78 }
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79 unsigned char endChar = *ptr;
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80 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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81
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82 return n;
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83 }
55
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84
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85 // <literal> ::= [a-z][A-Z][0-9]
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86 NodePtr literal() {
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87 NodePtr n = createNode(*ptr,0,0);
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88 ptr++;
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89 return n;
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90 }
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91
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92 // <group> ::= '('<regex>')'
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93 NodePtr group() {
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94 return regex();
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95 }
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96
55
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97
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98
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99 void token() {
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100 while (*ptr != '\0') {
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101 if (*ptr == '('){
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102 ptr++;
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103 tokenType = '(';
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104 tokenValue = 0;
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105 if (ptr[1] == ')') {
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106 ptr++;
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107 }
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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 return;
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114 } else if (*ptr == '[') {
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115 ptr++;
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116 tokenType = '[';
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117 tokenValue = *ptr;
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118 if (ptr[1] == ']') {
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119 ptr++;
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120 }
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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;
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127 } else if (*ptr == '*'){
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128 ptr++;
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129 tokenType = '*';
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130 tokenValue = 0;
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131 return;
73
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132 } else if (*ptr == '\\'){
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133 // need more proccesing
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134 /*
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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135 \277
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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136 \0xa5
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137 \[
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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138 \\
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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139 \utf-8 etc...
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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140 */
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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141 } else {
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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142 tokenType = 'a';
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143 tokenValue = *ptr;
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144 return;
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145 }
55
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146 }
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147
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148 tokenType = 0;
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149 tokenValue = 0;
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150 return;
55
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151 }
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152
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153 // <regexAtom> ::= <literal>|<charClass>|<group>
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154 NodePtr regexAtom() {
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155
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156 token();
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157 NodePtr n = NULL;
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158 if (tokenType == 'a') n = literal();
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159 else if (tokenType == '[') n = charClass();
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160 else if (tokenType == '(') n = group();
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161
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162 return n;
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163 }
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164
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165 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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166 NodePtr regex() {
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167 NodePtr n = regexAtom();
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168 while (*ptr) {
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169 token();
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170 if (tokenType == '*') {
71
58d2b10988c9 move ptr++ in token()
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171 n = createNode('*',n,0);
64
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172 } else if (tokenType == '|') {
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173 NodePtr n1 = regex();
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174 n = createNode('|',n,n1);
74
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masa
parents: 73
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175 } else if (tokenType == ')') {
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masa
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176 return n;
64
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177 } else {
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178 NodePtr n1 = regex();
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179 n = createNode('+',n,n1);
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180 }
67
4842ca2cf8ee print character
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parents: 66
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181 } return n;
68
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182 }
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183
69
eecddded9b91 implement printTree
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 68
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184 void descendTree(NodePtr n) {
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parents: 68
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185 static int d = 0;
68
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parents: 67
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186 if (n->right != NULL) {
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187 d++;
69
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188 descendTree(n->right);
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189 d--;
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190 }
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parents: 68
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191 printf("%*c%c\n",d*4, ' ',n->Value.character);
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parents: 68
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192 if (n->left != NULL) {
68
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193 d++;
69
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194 descendTree(n->left);
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195 d--;
68
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196 }
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197 }
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198
66
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parents: 65
diff changeset
199 void printTree(NodePtr n) {
72
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parents: 71
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200 puts("---Print Node----");
69
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parents: 68
diff changeset
201 descendTree(n);
72
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parents: 71
diff changeset
202 puts("-----------------");
66
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parents: 65
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203 }
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parents: 65
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204
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
205
62
a49b4a8b8c14 implement isLiteral
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 61
diff changeset
206 int main(int argc, char **argv)
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
207 {
56
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
208 for (int i = 1; i < argc; i++) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
209 if (strcmp(argv[i],"-regex") == 0) {
64
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parents: 63
diff changeset
210 ptr = (unsigned char*)argv[i+1]; i++;
56
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parents: 55
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211 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
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212 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
213
56
8901bc071d33 implement string() and literal()
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parents: 55
diff changeset
214 printf("regex : %s\n",ptr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
215 NodePtr n = regex();
66
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
216 printTree(n);
45
89a198fa6b23 add dfrTobin
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
217 return 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
218 }