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annotate c/regexParser/createRegexTree.cc @ 89:50a146c05192

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add NodeNumber in Regex Parser tree
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Fri, 23 Oct 2015 17:20:54 +0900
parents aef2546cd130
children 912d7bd51f38
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1d9bbf922bb6 add createRegexTree.cc
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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1 #include <stdlib.h>
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2 #include <stdio.h>
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3 #include "regexParser.h"
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4
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5 NodePtr createNode(RegexInfoPtr,unsigned char,NodePtr,NodePtr);
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6 NodePtr charClass(RegexInfoPtr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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7 NodePtr group(RegexInfoPtr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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8 void token(RegexInfoPtr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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9 NodePtr regexAtom(RegexInfoPtr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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10 NodePtr regex(RegexInfoPtr);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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11
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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12 /**
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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13 * Create a node of regex parse tree.
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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14 * tokenType
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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15 * regexPosition(state)
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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16 * stateTransitionTable
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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17 */
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18 NodePtr createNode(RegexInfoPtr ri,unsigned char character, NodePtr left, NodePtr right) {
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19 NodePtr n = (NodePtr)malloc(sizeof(Node));
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20 n->tokenType = ri->tokenType;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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21 n->self = n;
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22 n->Value.character = character;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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23 n->left = left;
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24 n->right = right;
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25
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26 if (ri->tokenType == 'a') {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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27 static int number = 1;
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28 n->nodeNumber = number;
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29 number++;
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30 ri->tokenType = 0;
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31 }
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32 return n;
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33 }
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34
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35 // <charClass> ::= '['<literal>'-'<literal>']'
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36 NodePtr charClass(RegexInfoPtr ri) {
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37 NodePtr n = (NodePtr)malloc(sizeof(Node));
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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38 unsigned char startChar = ri->ptr[0];
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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39 while (ri->ptr[0] == '-') {
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40 ri->ptr++;
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41 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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42 unsigned char endChar = ri->ptr[0];
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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43 unsigned char *charTable = (unsigned char*)malloc(sizeof(char)*256);
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44
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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45 return n;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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46 }
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47
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48 // <literal> ::= [a-z][A-Z][0-9]
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49 NodePtr literal(RegexInfoPtr ri) {
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50 unsigned char *top = ri->ptr;
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51 NodePtr n = createNode(ri,ri->ptr[0],0,0);
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52 ri->ptr++;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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53 return n;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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54 }
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55
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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56 // <group> ::= '('<regex>')'
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57 NodePtr group(RegexInfoPtr ri) {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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58 return regex(ri);
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59 }
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60
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61
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62
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63 void token(RegexInfoPtr ri) {
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64 while (ri->ptr[0] != '\0') {
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65 if (ri->ptr[0] == '('){
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66 ri->ptr++;
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67 ri->tokenType = '(';
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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68 ri->tokenValue = 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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69 if (ri->ptr[1] == ')') {
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70 ri->ptr++;
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71 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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72 return;
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73 } else if (ri->ptr[0] == ')') {
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74 ri->ptr++;
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75 ri->tokenType = ')';
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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76 ri->tokenValue = ri->ptr[0];
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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77 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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78 } else if (ri->ptr[0] == '[') {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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79 ri->ptr++;
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80 ri->tokenType = '[';
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81 ri->tokenValue = ri->ptr[0];
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82 if (ri->ptr[1] == ']') {
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83 ri->ptr++;
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84 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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85 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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86 } else if (ri->ptr[0] == '|'){
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87 ri->ptr++;
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88 ri->tokenType = '|';
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89 ri->tokenValue = 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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90 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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91 } else if (ri->ptr[0] == '*'){
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92 ri->ptr++;
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93 ri->tokenType = '*';
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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94 ri->tokenValue = 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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95 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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96 } else if (ri->ptr[0] == '\\'){
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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97 // need more proccesing
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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98 /*
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99 \277
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100 \0xa5
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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101 \[
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102 \\
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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103 \utf-8 etc...
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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104 */
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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105 } else {
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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106 ri->tokenType = 'a';
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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107 ri->tokenValue = ri->ptr[0];
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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108 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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109 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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110 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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111 ri->tokenType = 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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112 ri->tokenValue = 0;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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113 return;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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114 }
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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115
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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116 // <regexAtom> ::= <literal>|<charClass>|<group>
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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117 NodePtr regexAtom(RegexInfoPtr ri) {
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118
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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119 token(ri);
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120 NodePtr n = NULL;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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121 if (ri->tokenType == 'a') n = literal(ri);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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122 else if (ri->tokenType == '[') n = charClass(ri);
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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123 else if (ri->tokenType == '(') n = group(ri);
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124
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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125 return n;
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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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126 }
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127
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128 // <regex> ::= <regexAtom>|<regexAtom>'*'|<regexAtom>'|'<regex>|<regexAtom><regex>
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129 NodePtr regex(RegexInfoPtr ri) {
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130 NodePtr n = regexAtom(ri);
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131 while (ri->ptr[0]) {
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132 token(ri);
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133 if (ri->tokenType == '*') {
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134 n = createNode(ri,'*',n,0);
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135 } else if (ri->tokenType == '|') {
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136 NodePtr n1 = regex(ri);
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137 n = createNode(ri,'|',n,n1);
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138 } else if (ri->tokenType == ')') {
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139 return n;
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140 } else {
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141 NodePtr n1 = regex(ri);
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142 n = createNode(ri,'+',n,n1);
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143 }
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144 } return n;
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145 }
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146