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annotate c/regexParser/main.cc @ 79:52da06c3f050

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add printTree.cc & fix Makefile
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Tue, 29 Sep 2015 18:36:31 +0900
parents 7f53a587bf97
children 0a452d69f0e2
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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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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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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 unsigned char *ptr;
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15 unsigned char tokenType;
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16 int tokenValue;
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17
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18 NodePtr charClass();
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19 NodePtr group();
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20 NodePtr regex();
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21 NodePtr createNode(unsigned char,NodePtr,NodePtr);
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22 void token();
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23 NodePtr regexAtom();
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24 extern void printTree(NodePtr);
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25
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26
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27 bool isLiteral(char c) {
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28 if (*ptr > 0x7f) return true;
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29 else if (*ptr == '(') return false;
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30 else if (*ptr == '[') return false;
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31 else if (*ptr == '|') return false;
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32 else if (*ptr == '*') return false;
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33 return true;
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34 }
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35
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36 /**
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37 * Create a node of regex parse tree.
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38 * tokenType
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39 * regexPosition(state)
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40 * stateTransitionTable
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41 */
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42 NodePtr createNode(unsigned char character, NodePtr left, NodePtr right) {
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43 NodePtr n = (NodePtr)malloc(sizeof(Node));
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44 n->self = n;
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45 n->Value.character = character;
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46 n->left = left;
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47 n->right = right;
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48 return n;
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49 }
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50
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51 // <charClass> ::= '['<literal>'-'<literal>']'
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52 NodePtr charClass() {
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53 NodePtr n = (NodePtr)malloc(sizeof(Node));
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54 unsigned char startChar = *ptr;
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55 while (*ptr == '-') {
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56 ptr++;
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57 }
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58 unsigned char endChar = *ptr;
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59 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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60
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61 return n;
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62 }
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63
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64 // <literal> ::= [a-z][A-Z][0-9]
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65 NodePtr literal() {
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66 NodePtr n = createNode(*ptr,0,0);
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67 ptr++;
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68 return n;
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69 }
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70
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71 // <group> ::= '('<regex>')'
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72 NodePtr group() {
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73 return regex();
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74 }
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75
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78 void token() {
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79 while (*ptr != '\0') {
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80 if (*ptr == '('){
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81 ptr++;
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82 tokenType = '(';
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83 tokenValue = 0;
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84 if (ptr[1] == ')') {
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85 ptr++;
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86 }
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87 return;
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88 } else if (*ptr == ')') {
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89 ptr++;
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90 tokenType = ')';
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91 tokenValue = *ptr;
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92 return;
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93 } else if (*ptr == '[') {
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94 ptr++;
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95 tokenType = '[';
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96 tokenValue = *ptr;
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97 if (ptr[1] == ']') {
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98 ptr++;
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99 }
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100 return;
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101 } else 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 return;
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106 } else if (*ptr == '*'){
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107 ptr++;
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108 tokenType = '*';
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109 tokenValue = 0;
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110 return;
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111 } else if (*ptr == '\\'){
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112 // need more proccesing
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113 /*
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114 \277
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115 \0xa5
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116 \[
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117 \\
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118 \utf-8 etc...
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119 */
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120 } else {
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121 tokenType = 'a';
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122 tokenValue = *ptr;
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123 return;
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124 }
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125 }
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126
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127 tokenType = 0;
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128 tokenValue = 0;
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129 return;
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130 }
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131
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132 // <regexAtom> ::= <literal>|<charClass>|<group>
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133 NodePtr regexAtom() {
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134
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135 token();
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136 NodePtr n = NULL;
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137 if (tokenType == 'a') n = literal();
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138 else if (tokenType == '[') n = charClass();
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139 else if (tokenType == '(') n = group();
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140
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141 return n;
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142 }
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143
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144 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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145 NodePtr regex() {
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146 NodePtr n = regexAtom();
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147 while (*ptr) {
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148 token();
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149 if (tokenType == '*') {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 70
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150 n = createNode('*',n,0);
64
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
151 } else if (tokenType == '|') {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
152 NodePtr n1 = regex();
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
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153 n = createNode('|',n,n1);
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masa
parents: 73
diff changeset
154 } else if (tokenType == ')') {
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masa
parents: 73
diff changeset
155 return n;
64
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
156 } else {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
157 NodePtr n1 = regex();
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
158 n = createNode('+',n,n1);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
159 }
67
4842ca2cf8ee print character
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 66
diff changeset
160 } return n;
68
d27b3af1fe75 remove string()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 67
diff changeset
161 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 67
diff changeset
162
66
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Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
163
62
a49b4a8b8c14 implement isLiteral
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 61
diff changeset
164 int main(int argc, char **argv)
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
165 {
56
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
166 for (int i = 1; i < argc; i++) {
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
167 if (strcmp(argv[i],"-regex") == 0) {
64
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 63
diff changeset
168 ptr = (unsigned char*)argv[i+1]; i++;
56
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
169 }
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
170 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
diff changeset
171
56
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
172 printf("regex : %s\n",ptr);
8901bc071d33 implement string() and literal()
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 55
diff changeset
173 NodePtr n = regex();
66
f8fb3b463f70 fix when '|' come procces
Masataka Kohagura <e085726@ie.u-ryukyu.ac.jp>
parents: 65
diff changeset
174 printTree(n);
45
89a198fa6b23 add dfrTobin
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 return 0;
89a198fa6b23 add dfrTobin
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 }