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annotate c/regexParser/main.cc @ 57:71b497d25273

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fix literal()
author Masataka Kohagura <kohagura@cr.ie.u-ryukyu.ac.jp>
date Thu, 11 Jun 2015 19:50:02 +0900
parents 8901bc071d33
children 4053c3e0fa7f
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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 * <or> ::= '('<regex>'|'<regex>')'
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6 * <*> ::= <regex>'*'
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7 * <regex> ::= <literal>|<conc>|<or>|<charClass>
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8 */
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13
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14 char *ptr;
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15 typedef struct node {
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16 char character;
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17 struct node *left;
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18 struct node *right;
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19 } Node, *NodePtr;
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20
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21 NodePtr charClass();
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22 NodePtr string();
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23 NodePtr _or();
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24 NodePtr asterisk();
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25 NodePtr regex();
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26 NodePtr createNode(char,NodePtr,NodePtr);
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27
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28 NodePtr createNode(char character, NodePtr left, NodePtr right) {
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29 NodePtr n = (NodePtr)malloc(sizeof(Node));
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30 n->character = character;
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31 n->left = left;
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32 n->right = right;
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33 return n;
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34 }
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35
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36 // <charClass> ::= '['<literal>'-'<literal>']'
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37 NodePtr charClass() {
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38 NodePtr n = createNode(0,0,0);
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39 return n;
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40 }
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41
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42 // <literal> ::= [a-z][A-Z][0-9]
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43 NodePtr literal() {
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44 char c = *ptr;
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45 NodePtr n = createNode(c,0,0);
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46 ptr++;
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47 return n;
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48 }
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49
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50 // <string> ::= <literal><literal>*
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51 NodePtr string() {
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52 char c = *ptr;
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53 NodePtr n;
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54
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55 if (('a'<=c && c<='z')||('A'<=c && c<='Z')||('0'<=c && c<='9')) {
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56 n = createNode(0,literal(),string());
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57 return n;
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58 } else {
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59 n = createNode(0,0,0);
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60 }
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61 }
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62
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63 // <or> ::= '('<regex>'|'<regex>')'
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64 NodePtr _or() {
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65 regex();
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66 while(*ptr++ == ')') {
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67 if (*ptr == '|') {
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68 ptr++;
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69 regex();
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70 }
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71 }
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72 }
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73
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74 // <*> ::= <regex>'*'
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75 NodePtr asterisk() {
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76
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77 }
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78
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79 // <regex> ::= <literal>|<string>|<or>|<charClass>
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80 // <literal> は <string> に内包されるから、<regex> ::= <string>|<or>|<charClass>が正しい??
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81 NodePtr regex() {
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82
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83 NodePtr n;
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84
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85 while (char c = *ptr) {
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86 if (c == '(') {
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87 ptr++;
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88 n = _or();
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89 } else if (c == '[') {
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90 n = charClass();
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91 } else {
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92 n = string();
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93 }
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94 ptr++;
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95 }
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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 int
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101 main(int argc, char **argv)
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102 {
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103 for (int i = 1; i < argc; i++) {
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104 if (strcmp(argv[i],"-regex") == 0) {
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105 ptr = argv[i+1]; i++;
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106 }
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107 }
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108
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109 printf("regex : %s\n",ptr);
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110 NodePtr n = regex();
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111
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112 return 0;
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113 }