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annotate c/regexParser/regexParser.cc @ 147:84d32375383a pairPro

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implement insertCharClass
author masa
date Tue, 15 Dec 2015 17:14:35 +0900
parents 50217a0545e8
children d1ebba6e117a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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
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7 static NodePtr charClass(RegexInfoPtr);
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8 static void token(RegexInfoPtr);
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9 static NodePtr regexAtom(RegexInfoPtr);
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10 NodePtr regex(RegexInfoPtr);
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11
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12 /**
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13 * Create a node of regex parse tree.
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14 * tokenType
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15 * regexPosition(state)
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16 * stateTransitionTable
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17 */
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18
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19 static
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20 NodePtr allocateNode() {
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21 NodePtr n = NEW(Node);
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22 n->cc = NULL;
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23 n->left = NULL;
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24 n->right = NULL;
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25 return n;
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26 }
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27
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28 static
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29 NodePtr createNode(RegexInfoPtr ri,unsigned char type,CharClassPtr cc, NodePtr left, NodePtr right) {
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30 NodePtr n = allocateNode();
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31
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32 n->tokenType = type;
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33 n->cc = cc;
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34 n->left = left;
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35 n->right = right;
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36 n->nodeNumber = ri->nodeNumber;
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37 ri->nodeNumber++;
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38
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39 return n;
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40 }
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41
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42 CharClassPtr createCharClassRange(unsigned long begin, unsigned long end, CharClassPtr left, CharClassPtr right) {
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43 CharClassPtr cc = NEW(CharClass);
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44 cc->type = 'r';
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45 cc->cond.range.begin = begin;
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46 cc->cond.range.end = end;
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47 cc->left = left;
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48 cc->right = right;
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49 cc->nextState.bitContainer = 0;
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50 return cc;
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51 }
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52
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53 CharClassPtr createCharClassWord(RegexInfoPtr ri) {
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54 CharClassPtr cc = NEW(CharClass);
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55 cc->type = 'a';
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56 cc->cond.w.word = ri->tokenValue;
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57 cc->cond.w.length = ri->ptr - ri->tokenValue;
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58 cc->nextState.bitContainer = 0;
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59 return cc;
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60 }
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61
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62 CharClassPtr insertCharClass(CharClassPtr cc, unsigned char begin, unsigned char end) {
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63 if (end < cc->cond.range.begin ) {
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64 CharClassPtr cc1 = createCharClassRange(cc->begin,cc->end,cc->left,cc->right);
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65 if (cc->left) {
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66 cc1->left = insertCharClass(cc->left,begin,end);
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67 return cc1;
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68 } else {
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69 CharClassPtr cc2 = createCharClassRange(begin,end,0,0);
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70 cc1->left = cc2;
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71 return cc1;
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72 }
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73 } else if (end == cc->cond.range.begin ) {
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74 cc->cond.range.begin = begin;
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75 } else if (end <= cc->cond.range.end) {
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76 if (begin < cc->cond.range.begin) {
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77 cc->cond.range.begin = begin;
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78 }
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79 } else if (begin > cc->cond.range.end ) {
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80 CharClassPtr cc1 = createCharClassRange(cc->begin,cc->end,cc->left,cc->right);
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81 if (cc->right) {
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82 cc1->rigt = insertCharClass(cc->right,begin,end);
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83 return cc1;
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84 } else {
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85 CharClassPtr cc2 = createCharClassRange(begin,end,0,0);
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86 cc1->right = cc2;
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87 return cc1;
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88 }
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89 } else if (begin == cc->cond.range.end ) {
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90 cc->cond.range.end = end;
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91 } else if (begin < cc->cond.range.begin) {
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92 cc->cond.range.begin = begin;
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93 }
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94 return cc;
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95 }
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96
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97 // <charClass> ::= '['<literal>'-'<literal>']'
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98 static
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99 NodePtr charClass(RegexInfoPtr ri) {
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100 CharClassPtr cc = NEW(CharClass);
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101 NodePtr n = createNode(ri,'c',cc,0,0);
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102 cc->type = 'r';
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103 cc->nextState.bitContainer = 0;
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104 RangeListPtr rangeList = &cc->cond.range;
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105 rangeList->begin = *ri->ptr;
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106 rangeList->end = *ri->ptr;
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107 rangeList->next = NULL;
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108
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109 for (ri->ptr++; *ri->ptr && *ri->ptr != ']'; ri->ptr++) {
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110 if (*ri->ptr == '-') {
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111 rangeList->end = *(ri->ptr + 1);
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112 ri->ptr++;
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113 continue;
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114 }
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115 if (ri->ptr[0] == 0 || ri->ptr[0] == ']') break;
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116 if (ri->ptr[0] == rangeList->end + 1) {
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117 rangeList->end = *ri->ptr;
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118 continue;
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119 }
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120 rangeList->next = NEW(RangeList);
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121 rangeList = rangeList->next;
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122 rangeList->begin = *ri->ptr;
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123 rangeList->end = *ri->ptr;
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124 rangeList->next = NULL;
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125 }
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126
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127 for (RangeListPtr r = &cc->cond.range; r; r = r->next) {
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128 cc = insertCharClass(cc, r->begin, r->end);
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129 }
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130
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131 n->cc = cc;
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132 // TODO literal support
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133 // merge rangeList here
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134 if (*ri->ptr) ri->ptr++;
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135 token(ri);
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136 return n;
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137 }
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138
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139 // <literal> ::= [a-z][A-Z][0-9]
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140 static
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141 NodePtr literal(RegexInfoPtr ri) {
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142 CharClassPtr cc = createCharClassWord(ri);
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143 token(ri);
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144 NodePtr n = createNode(ri,'a',cc,0,0);
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145 return n;
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146 }
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147
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ccc673449351 Look ahead '*'
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148 static
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149 void token(RegexInfoPtr ri) {
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150 while (ri->ptr[0] != '\0') {
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151 if (ri->ptr[0] == '('){
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152 ri->ptr++;
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153 ri->tokenType = '(';
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154 ri->tokenValue = NULL;
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155 return;
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156 } else if (ri->ptr[0] == ')') {
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157 ri->ptr++;
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158 ri->tokenType = ')';
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159 ri->tokenValue = ri->ptr;
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160 return;
135
e1a262ec75f0 impl charclass
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161 } else if (ri->ptr[0] == ']') {
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162 ri->ptr++;
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163 ri->tokenType = ']';
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164 ri->tokenValue = ri->ptr;
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165 return;
82
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parents:
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166 } else if (ri->ptr[0] == '|'){
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parents:
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167 ri->ptr++;
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168 ri->tokenType = '|';
118
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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169 ri->tokenValue = NULL;
82
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parents:
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170 return;
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parents:
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171 } else if (ri->ptr[0] == '*'){
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parents:
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172 ri->ptr++;
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173 ri->tokenType = '*';
118
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parents: 116
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174 ri->tokenValue = NULL;
82
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parents:
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175 return;
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parents:
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176 } else if (ri->ptr[0] == '\\'){
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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177 // need more proccesing
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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178 /*
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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179 \277
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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180 \0xa5
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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181 \[
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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182 \\
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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183 \utf-8 etc...
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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184 */
142
de0f332d560c insert charClassMerge function
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185 } else if (ri->ptr[0] == '[') {
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186 ri->ptr++;
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187 ri->tokenType = 'c';
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188 ri->tokenValue = ri->ptr;
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189 return;
82
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parents:
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190 } else {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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191 ri->tokenType = 'a';
118
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 116
diff changeset
192 ri->tokenValue = ri->ptr;
134
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diff changeset
193 if (isalnum(ri->ptr[0])) {
122
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 121
diff changeset
194 ri->ptr++;
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 121
diff changeset
195 }
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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196 return;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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197 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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198 }
134
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diff changeset
199 ri->tokenType = 0;
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200 ri->tokenValue = NULL;
82
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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201 return;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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202 }
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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203
130
7925e9abb078 add or flag
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 129
diff changeset
204 // <regexAtom> ::= <literal>|<charClass>|<group>
112
ec485345daf9 some function use static
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 108
diff changeset
205 static
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 NodePtr regexAtom(RegexInfoPtr ri) {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
207
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
208 NodePtr n = NULL;
124
masa
parents: 122
diff changeset
209 if (ri->tokenType == 'c') n = charClass(ri);
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
210 else if (ri->tokenType == 'a') n = literal(ri);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
211 else if (ri->tokenType == '(') {
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
212 n = regex(ri);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
213 if (ri->tokenType != ')') {
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masa
parents: 133
diff changeset
214 // error
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
215 }
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masa
parents: 133
diff changeset
216 token(ri);
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masa
parents: 133
diff changeset
217 }
dbafc753078e fix concatination & selection & grouping
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parents: 133
diff changeset
218 if (ri->tokenType == '*') {
dbafc753078e fix concatination & selection & grouping
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parents: 133
diff changeset
219 n = createNode(ri,'*',0,n,0);
dbafc753078e fix concatination & selection & grouping
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parents: 133
diff changeset
220 token(ri);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
221 }
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
222
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
223 return n;
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
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
226 // <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
227 NodePtr regex(RegexInfoPtr ri) {
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
228 token(ri);
128
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 127
diff changeset
229 NodePtr n = regexAtom(ri);
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
230 while (ri->tokenType) {
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
231 if (ri->tokenType == '*') {
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
232 n = createNode(ri,'*',0,n,0);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
233 token(ri);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
234 return n;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
235 } else if (ri->tokenType == '|') {
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
236 n = createNode(ri,'|',0,n,0);
133
ccc673449351 Look ahead '*'
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 132
diff changeset
237 NodePtr n1 = regex(ri);
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
238 n->right = n1;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 } else if (ri->tokenType == ')') {
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 return n;
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
241 } else {
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
242 n = createNode(ri,'+',0,n,0);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
243 NodePtr n1 = regexAtom(ri);
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
244 n->right = n1;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 }
134
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
246 }
dbafc753078e fix concatination & selection & grouping
masa
parents: 133
diff changeset
247 return n;
82
1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 }