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annotate c/regexParser/main.cc @ 58:4053c3e0fa7f

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implement group()
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Fri, 12 Jun 2015 19:02:00 +0900
parents 71b497d25273
children af189c727733
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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 * <string> ::= <literal><literal>*
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5 * <group> ::= '('<regex>')'
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6 * <or> ::= <regex>'|'<regex>
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7 * <*> ::= <regex>'*'
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8 * <regex> ::= <string>|<or>|<charClass>|<group>|<*>
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9 */
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10
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11 #include <stdio.h>
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12 #include <stdlib.h>
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13 #include <string.h>
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14
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15 typedef struct node {
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16 struct node *self;
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17 char character;
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18 struct node *left;
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19 struct node *right;
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20 } Node, *NodePtr;
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21
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22 char *ptr;
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23 NodePtr regexHeadNode;
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24
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25 NodePtr charClass();
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26 NodePtr string();
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27 NodePtr group();
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28 NodePtr _or();
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29 NodePtr asterisk();
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30 NodePtr regex();
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31 NodePtr createNode(char,NodePtr,NodePtr);
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32
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33 NodePtr createNode(char character, NodePtr left, NodePtr right) {
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34 NodePtr n = (NodePtr)malloc(sizeof(Node));
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35 n->self = n;
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36 n->character = character;
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37 n->left = left;
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38 n->right = right;
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39
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40 return n;
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41 }
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42
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43 // <charClass> ::= '['<literal>'-'<literal>']'
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44 NodePtr charClass() {
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45 ptr++;
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46 NodePtr n = createNode(0,0,0);
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47 return n;
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48 }
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49
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50 // <literal> ::= [a-z][A-Z][0-9]
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51 NodePtr literal() {
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52 char c = *ptr;
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53 NodePtr n = createNode(c,0,0);
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54 ptr++;
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55 return n;
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56 }
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57
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58 // <string> ::= <literal><literal>*
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59 NodePtr string() {
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60 char c = *ptr;
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61 NodePtr n = NULL;
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62 printf("%c\n",c);
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63 if (('a'<=c && c<='z')||('A'<=c && c<='Z')||('0'<=c && c<='9')) {
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64 n = createNode(0,literal(),string());
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65 } else {
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66 n = createNode(0,0,0);
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67 }
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68 return n;
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69 }
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70
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71 // <group> ::= '('<regex>')' | '('<regex>'|'<regex>')'
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72 NodePtr group() {
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73 NodePtr n;
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74 if (*ptr == ')') {
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75 n = createNode(0,0,0);
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76 ptr++;
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77 } else {
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78 ptr++;
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79 n = regex();
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80 }
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81
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82 return n;
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83 }
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84
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85
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86 // <or> ::= <regex>'|'<regex>
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87 NodePtr _or() {
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88 NodePtr n = createNode('|',regexHeadNode,regex());
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89 return n;
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90 }
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91
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92 // <*> ::= <regex>'*'
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93 NodePtr asterisk() {
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94
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95 }
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96
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97 // <regex> ::= <string>|<or>|<charClass>|<group>|<*>
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98 NodePtr regex() {
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99
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100 NodePtr n;
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101
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102 while (*ptr != '\0') {
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103 if ((*ptr == '(') || (*ptr == ')')) {
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104 n = group();
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105 } else if (*ptr == '[') {
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106 n = charClass();
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107 } else if (*ptr == '|'){
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108 n = _or();
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109 } else {
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110 n = string();
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111 regexHeadNode = n;
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112 }
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113 }
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114
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115 return n;
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116 }
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117
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118 int
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119 main(int argc, char **argv)
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120 {
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121 for (int i = 1; i < argc; i++) {
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122 if (strcmp(argv[i],"-regex") == 0) {
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123 ptr = argv[i+1]; i++;
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124 }
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125 }
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126
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127 printf("regex : %s\n",ptr);
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128 NodePtr n = regex();
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129
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130 return 0;
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131 }