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annotate c/regexParser/main.cc @ 62:a49b4a8b8c14

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implement isLiteral
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Tue, 14 Jul 2015 16:45:07 +0900
parents 67cade0e35b0
children 8fd3d35e9861
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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Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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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 bool isLiteral(char c) {
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34 if (('a'<=c && c<='z')||('A'<=c && c<='Z')||('0'<=c && c<='9')) {
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35 return true;
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36 }
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37 return false;
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38 }
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39
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40 void printNodeDate(NodePtr n) {
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41 puts("---------------------");
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42 printf("Self Node char : %c\n", n->character);
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43 printf("Self Node addr : %p\n", n->self);
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44 printf("left Node addr : %p\n", n->left);
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45 printf("right Node addr : %p\n", n->right);
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46 puts("---------------------");
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47 puts("");
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48 }
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50 NodePtr createNode(char character, NodePtr left, NodePtr right) {
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51 NodePtr n = (NodePtr)malloc(sizeof(Node));
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52 n->self = n;
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53 n->character = character;
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54 n->left = left;
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55 n->right = right;
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56
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57 printNodeDate(n);
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58 return n;
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59 }
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60
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61 // <charClass> ::= '['<literal>'-'<literal>']'
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62 NodePtr charClass() {
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63 ptr++;
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64 NodePtr n = (NodePtr)malloc(sizeof(Node));
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65 return n;
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66 }
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67
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68 // <literal> ::= [a-z][A-Z][0-9]
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69 NodePtr literal() {
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70 char c = *ptr;
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71 NodePtr n = createNode(c,0,0);
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72 ptr++;
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73 return n;
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74 }
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75
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76 // <string> ::= <literal><literal>*
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77 NodePtr string() {
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78 char c = *ptr;
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79 NodePtr n = NULL;
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80 if (isLiteral(c)) {
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81 n = createNode(0,literal(),string());
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82 } else {
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83 n = createNode(0,0,0);
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84 }
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85 return n;
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86 }
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87
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88 // <group> ::= '('<regex>')' | '('<regex>'|'<regex>')'
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89 NodePtr group() {
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90 NodePtr n;
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91 if (*ptr == ')') {
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92 n = createNode(0,0,0);
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93 ptr++;
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94 } else {
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95 ptr++;
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96 n = regex();
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97 }
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98 return n;
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99 }
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100
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101
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102 // <or> ::= <regex>'|'<regex>
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103 NodePtr _or() {
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104 ptr++;
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105 NodePtr n = createNode('|',regexHeadNode,regex());
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106 return n;
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107 }
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108
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109 // <*> ::= <regex>'*'
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110 NodePtr asterisk() {
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111 ptr++;
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112 NodePtr n = createNode('*',regexHeadNode,regex());
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113 return n;
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114 }
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115
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116 // <regex> ::= <string>|<or>|<charClass>|<group>|<*>
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117 NodePtr regex() {
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118
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119 NodePtr n;
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120
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121 while (*ptr != '\0') {
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122 if ((*ptr == '(') || (*ptr == ')')) {
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123 n = group();
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124 } else if (*ptr == '[') {
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125 n = charClass();
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126 } else if (*ptr == '|'){
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127 n = _or();
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128 } else if (*ptr == '*'){
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129 n = asterisk();
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130 } else {
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131 n = string();
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132 regexHeadNode = n;
56
8901bc071d33 implement string() and literal()
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133 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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134 }
56
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135 return n;
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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136 }
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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137
62
a49b4a8b8c14 implement isLiteral
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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138 int main(int argc, char **argv)
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
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139 {
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8901bc071d33 implement string() and literal()
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140 for (int i = 1; i < argc; i++) {
8901bc071d33 implement string() and literal()
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141 if (strcmp(argv[i],"-regex") == 0) {
8901bc071d33 implement string() and literal()
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142 ptr = argv[i+1]; i++;
8901bc071d33 implement string() and literal()
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143 }
8901bc071d33 implement string() and literal()
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144 }
55
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents: 54
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145
56
8901bc071d33 implement string() and literal()
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146 printf("regex : %s\n",ptr);
8901bc071d33 implement string() and literal()
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147 NodePtr n = regex();
45
89a198fa6b23 add dfrTobin
Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
parents:
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148 return 0;
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parents:
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149 }