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annotate c/regexParser/regexParser.cc @ 133:ccc673449351 pairPro

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Look ahead '*'
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 03 Dec 2015 20:47:11 +0900
parents fb4c8adf3a80
children dbafc753078e
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include <string.h>
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4 #include <ctype.h>
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5 #include "regexParser.h"
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6 #include "error.h"
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7
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8 static NodePtr allocateNode();
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9 static NodePtr createNode(RegexInfoPtr,unsigned char,NodePtr,NodePtr);
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10 static NodePtr charClass(RegexInfoPtr);
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11 static NodePtr group(RegexInfoPtr);
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12 static void token(RegexInfoPtr);
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13 static NodePtr regexAtom(RegexInfoPtr);
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14 NodePtr regex(RegexInfoPtr);
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16 /**
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17 * Create a node of regex parse tree.
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18 * tokenType
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19 * regexPosition(state)
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20 * stateTransitionTable
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21 */
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22
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23 static
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24 NodePtr allocateNode() {
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25 NodePtr n = NEW(Node);
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26 n->cc = NULL;
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27 n->left = NULL;
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28 n->right = NULL;
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29 return n;
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30 }
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31
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32 static
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33 CharClassPtr createCharClassWord(RegexInfoPtr ri) {
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34 CharClassPtr cc = NEW(CharClass);
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35 cc->type = 'a';
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36 cc->cond = NEW(Condition);
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37 cc->cond->w = NEW(Word);
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38 cc->cond->w->word = ri->tokenValue;
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39 cc->cond->w->length = ri->ptr - ri->tokenValue;
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40
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41 return cc;
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42 }
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44 static
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45 NodePtr createNode(RegexInfoPtr ri,unsigned char type, NodePtr left, NodePtr right) {
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46 NodePtr n = allocateNode();
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47
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48 n->tokenType = type;
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49 n->left = left;
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50 n->right = right;
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51 n->nodeNumber = ri->nodeNumber;
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52 ri->nodeNumber++;
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53
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54 if (type == 'a') {
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55 n->cc = createCharClassWord(ri);
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56 }
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57
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58 return n;
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59 }
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61
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62 // <charClass> ::= '['<literal>'-'<literal>']'
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63 static
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64 NodePtr charClass(RegexInfoPtr ri) {
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65 NodePtr n = allocateNode();
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66
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67 n->tokenType = 'c';
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68 n->nodeNumber = ri->nodeNumber;
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69 ri->nodeNumber++;
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70
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71 CharClassPtr cc = NEW(CharClass);
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72 cc->type = 'r';
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73 cc->cond = NEW(Condition);
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74 cc->cond->range = NEW(RangeList);
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75 cc->cond->range->begin = ri->ptr;
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76 cc->cond->range->end = ri->ptr + 1;
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77 cc->cond->range->next = NULL;
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79 int i = 0;
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80
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81 RangeListPtr rangeList = cc->cond->range;
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83 while (ri->ptr[i] != ']') {
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84 if (ri->ptr[i] == '-') i++;
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86 rangeList->end = ri->ptr + i;
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87 rangeList->next = NEW(RangeList);
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88 rangeList = rangeList->next;
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89 rangeList->begin = ri->ptr+i+1;
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90 rangeList->next = NULL;
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91 i++;
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92 }
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93 // TODO literal support
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94
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95 rangeList->end = ri->ptr + i - 1;
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96
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97 return n;
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98 }
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99
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100 // <literal> ::= [a-z][A-Z][0-9]
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101 static
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102 NodePtr literal(RegexInfoPtr ri) {
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103 NodePtr n = createNode(ri,'a',0,0);
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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 static
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109 NodePtr group(RegexInfoPtr ri) {
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110 return regex(ri);
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111 }
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113 static
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114 void asterCheck(RegexInfoPtr ri) {
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115 if (ri->ptr[0] == '*') {
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116 ri->asterFlag = true;
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117 }
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118 return;
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119 }
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120
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121 static
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122 void token(RegexInfoPtr ri) {
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123 while (ri->ptr[0] != '\0') {
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124 if (ri->ptr[0] == '('){
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125 ri->ptr++;
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126 ri->tokenType = '(';
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127 ri->tokenValue = NULL;
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128 return;
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129 } else if (ri->ptr[0] == ')') {
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130 ri->ptr++;
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131 ri->tokenType = ')';
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132 ri->tokenValue = ri->ptr;
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133 asterCheck(ri);
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134 return;
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135 } else if (ri->ptr[0] == '[') {
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136 ri->ptr++;
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137 ri->tokenType = 'c';
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138 ri->tokenValue = ri->ptr;
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139 return;
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140 } else if (ri->ptr[0] == '|'){
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141 ri->ptr++;
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142 ri->tokenType = '|';
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143 ri->tokenValue = NULL;
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144 ri->orNum++;
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145 return;
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146 } else if (ri->ptr[0] == '*'){
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147 ri->ptr++;
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parents:
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148 ri->tokenType = '*';
118
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 116
diff changeset
149 ri->tokenValue = NULL;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 return;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
151 } else if (ri->ptr[0] == '\\'){
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 // need more proccesing
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 /*
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 \277
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 \0xa5
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
156 \[
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
157 \\
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 \utf-8 etc...
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 */
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 } else {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 ri->tokenType = 'a';
118
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 116
diff changeset
162 ri->tokenValue = ri->ptr;
122
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 121
diff changeset
163 while (isalnum(ri->ptr[0])) {
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 121
diff changeset
164 ri->ptr++;
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 121
diff changeset
165 }
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
166 asterCheck(ri);
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 return;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 return;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
172
130
7925e9abb078 add or flag
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 129
diff changeset
173 // <regexAtom> ::= <literal>|<charClass>|<group>
112
ec485345daf9 some function use static
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 108
diff changeset
174 static
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 NodePtr regexAtom(RegexInfoPtr ri) {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
176
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 token(ri);
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 NodePtr n = NULL;
124
masa
parents: 122
diff changeset
179 if (ri->tokenType == 'c') n = charClass(ri);
128
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 127
diff changeset
180 if (ri->tokenType == 'a') n = literal(ri);
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 127
diff changeset
181 if (ri->tokenType == '(') n = group(ri);
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
182
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 return n;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
185
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
186 // <regex> ::= <regexAtom> | <regexAtom>'*'<regex> | <regexAtom>'|'<regex> | <regexAtom><regexAtom>'*' | <regexAtom><regex>
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 NodePtr regex(RegexInfoPtr ri) {
128
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 127
diff changeset
188 NodePtr n = regexAtom(ri);
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 while (ri->ptr[0]) {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 token(ri);
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 if (ri->tokenType == '*') {
125
4d6ac69801ad fix createNode
Nozomi
parents: 122
diff changeset
192 n = createNode(ri,'*',n,0);
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
193 ri->asterFlag = false;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 } else if (ri->tokenType == '|') {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 NodePtr n1 = regex(ri);
125
4d6ac69801ad fix createNode
Nozomi
parents: 122
diff changeset
196 n = createNode(ri,'|',n,n1);
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
197 } else if (ri->tokenType == '(') {
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
198 ri->ptr--;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
199 NodePtr n1 = regex(ri);
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
200 if (ri->asterFlag == true) {
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
201 n1 = createNode(ri,'*',n1,0);
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
202 ri->asterFlag = false;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
203 ri->ptr++;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
204 }
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
205 n = createNode(ri,'+',n,n1);
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 } else if (ri->tokenType == ')') {
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
207 if (ri->orNum != 0 && ri->ptr[0] != ')') {
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
208 ri->ptr--;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
209 ri->orNum--;
130
7925e9abb078 add or flag
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 129
diff changeset
210 }
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 return n;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 } else {
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
213 NodePtr n1 = NULL;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
214 if (ri->asterFlag == true) {
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
215 ri->ptr = ri->tokenValue;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
216 NodePtr n1 = regexAtom(ri);
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
217 n1 = createNode(ri,'*',n1,0);
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
218 ri->asterFlag = false;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
219 ri->ptr++;
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
220 } else {
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
221 n1 = regex(ri);
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
222 }
132
fb4c8adf3a80 fix include '|' in regex
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 130
diff changeset
223 n = createNode(ri,'+',n,n1);
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
224 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
225 } return n;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
226 }