cline: regex_parser.c@fa625066ae52

     1 /*

     2  * regex_parser.c

     3  *

     4  *  Created on: 26.01.2012

     5  *      Author: Mike

     6  */

     8 #include "regex_parser.h"

    10 regex_parser_t* new_regex_parser_t() {

    11   regex_parser_t* ret = malloc(sizeof(regex_parser_t));

    12   if (ret != NULL) {

    13     ret->pattern_list = new_string_list_t();

    14     ret->matched_lines = 0;

    15     ret->pattern_match = 0;

    16     ret->compiled_patterns = NULL;

    17     ret->compiled_pattern_count = 0;

    18   }

    19   return ret;

    20 }

    22 void regex_destcomppats(regex_parser_t* parser) {

    23   if (parser->compiled_patterns != NULL) {

    24     for (int i = 0 ; i < parser->compiled_pattern_count ; i++) {

    25       if (parser->compiled_patterns[i] != NULL) {

    26         free(parser->compiled_patterns[i]);

    27       }

    28     }

    29     free(parser->compiled_patterns);

    30     parser->compiled_patterns = NULL;

    31     parser->compiled_pattern_count = 0;

    32   }

    33 }

    35 void destroy_regex_parser_t(regex_parser_t* parser) {

    36   regex_destcomppats(parser);

    37   destroy_string_list_t(parser->pattern_list);

    38   free(parser);

    39 }

    41 bool regex_parser_matching(regex_parser_t* parser) {

    42   return parser->pattern_match > 0;

    43 }

    45 int regex_parser_do(regex_parser_t* parser, char* input) {

    46   int err = REG_NOMATCH;

    47   if (parser->compiled_pattern_count > 0) {

    48     regmatch_t match;

    50     if (regex_parser_matching(parser)) {

    51       parser->matched_lines++;

    53       err = regexec(parser->compiled_patterns[parser->pattern_match],

    54           input, 1, &match, 0);

    55       if (err > 0 && err != REG_NOMATCH) {

    56         fprintf(stderr, "Regex-Error: 0x%08x", err);

    57       }

    58       if (err == 0) {

    59         parser->pattern_match = 0;

    60         /* do not match line, if it does not end with the pattern */

    61         if (match.rm_eo < strlen(input)) {

    62           parser->matched_lines--;

    63         }

    64       }

    65     } else {

    66       for (int i = 0 ; i < parser->compiled_pattern_count - 1 ; i += 2) {

    67         err = regexec(parser->compiled_patterns[i], input, 1, &match, 0);

    68         if (err > 0 && err != REG_NOMATCH) {

    69           fprintf(stderr, "Regex-Error: 0x%08x", err);

    70         }

    71         if (err == 0) {

    72           parser->pattern_match = i+1;

    73           parser->matched_lines = 0;

    74           /* Check, if end pattern is also in this line */

    75           regex_parser_do(parser, input);

    76           /* do not match line, if it does not start with the pattern */

    77           if (match.rm_so > 0 && parser->matched_lines > 0) {

    78             parser->matched_lines--;

    79           }

    80           break;

    81         }

    82       }

    83     }

    84   }

    85   return err;

    86 }

    88 bool regex_compile_all(regex_parser_t* parser) {

    89   bool success = true;

    90   size_t pcount = parser->pattern_list->count;

    91   if (pcount > 0) {

    92     regex_destcomppats(parser);

    93     parser->compiled_patterns = calloc(pcount, sizeof(regex_t));

    94     parser->compiled_pattern_count = pcount;

    96     regex_t* re;

    97     for (int i = 0 ; i < pcount ; i++) {

    98       re = malloc(sizeof(regex_t));

    99       if (regcomp(re, parser->pattern_list->items[i], REG_EXTENDED) == 0) {

   100         parser->compiled_patterns[i] = re;

   101       } else {

   102         fprintf(stderr, "Cannot compile pattern: %s\n",

   103             (parser->pattern_list->items[i]));

   104         parser->compiled_patterns[i] = NULL;

   105         success = false;

   106       }

   107     }

   108   }

   109   return success;

   110 }

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