/*

 * listcap.c

 *

 * capture history (?@...) sample.

 */

#include <stdio.h>

#include <string.h>

#include "oniguruma.h"

static int

node_callback(int group, int beg, int end, int level, int at, void* arg)

{

  int i;

  if (at != ONIG_TRAVERSE_CALLBACK_AT_FIRST)

    return -1; /* error */

  /* indent */

  for (i = 0; i < level * 2; i++)

    fputc(' ', stderr);

  fprintf(stderr, "%d: (%d-%d)\n", group, beg, end);

  return 0;

}

extern int ex(unsigned char* str, unsigned char* pattern,

              OnigSyntaxType* syntax)

{

  int r;

  unsigned char *start, *range, *end;

  regex_t* reg;

  OnigErrorInfo einfo;

  OnigRegion *region;

  r = onig_new(&reg, pattern, pattern + strlen((char* )pattern),

	       ONIG_OPTION_DEFAULT, ONIG_ENCODING_ASCII, syntax, &einfo);

  if (r != ONIG_NORMAL) {

    char s[ONIG_MAX_ERROR_MESSAGE_LEN];

    onig_error_code_to_str((UChar* )s, r, &einfo);

    fprintf(stderr, "ERROR: %s\n", s);

    return -1;

  }

  fprintf(stderr, "number of captures: %d\n", onig_number_of_captures(reg));

  fprintf(stderr, "number of capture histories: %d\n",

          onig_number_of_capture_histories(reg));

  region = onig_region_new();

  end   = str + strlen((char* )str);

  start = str;

  range = end;

  r = onig_search(reg, str, end, start, range, region, ONIG_OPTION_NONE);

  if (r >= 0) {

    int i;

    fprintf(stderr, "match at %d\n", r);

    for (i = 0; i < region->num_regs; i++) {

      fprintf(stderr, "%d: (%d-%d)\n", i, region->beg[i], region->end[i]);

    }

    fprintf(stderr, "\n");

    r = onig_capture_tree_traverse(region, ONIG_TRAVERSE_CALLBACK_AT_FIRST,

                                   node_callback, (void* )0);

  }

  else if (r == ONIG_MISMATCH) {

    fprintf(stderr, "search fail\n");

  }

  else { /* error */

    char s[ONIG_MAX_ERROR_MESSAGE_LEN];

    onig_error_code_to_str((UChar* )s, r);

    return -1;

  }

  onig_region_free(region, 1 /* 1:free self, 0:free contents only */);

  onig_free(reg);

  return 0;

}

extern int main(int argc, char* argv[])

{

  int r;

  OnigSyntaxType syn;

  static UChar* str1 = (UChar* )"((())())";

  static UChar* pattern1

    = (UChar* )"\\g
(?@
\\(\\g<s>\\)){0}(?@<s>(?:\\g
)*|){0}";

  static UChar* str2     = (UChar* )"x00x00x00";

  static UChar* pattern2 = (UChar* )"(?@x(?@\\d+))+";

  static UChar* str3     = (UChar* )"0123";

  static UChar* pattern3 = (UChar* )"(?@.)(?@.)(?@.)(?@.)";

  OnigEncoding use_encs[] = { ONIG_ENCODING_ASCII };

  onig_initialize(use_encs, sizeof(use_encs)/sizeof(use_encs[0]));

 /* enable capture hostory */

  onig_copy_syntax(&syn, ONIG_SYNTAX_DEFAULT);

  onig_set_syntax_op2(&syn, 

       onig_get_syntax_op2(&syn) | ONIG_SYN_OP2_ATMARK_CAPTURE_HISTORY);

  r = ex(str1, pattern1, &syn);

  r = ex(str2, pattern2, &syn);

  r = ex(str3, pattern3, &syn);

  onig_end();

  return r;

}