/*

 * echo.c

 */

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include "oniguruma.h"

static int

echo(OnigCalloutArgs* args, void* user_data)

{

  int r;

  OnigCalloutIn in;

  OnigType type;

  OnigValue val;

  FILE* fp;

  fp = stdout;

  in = onig_get_callout_in_by_callout_args(args);

  r = onig_get_arg_by_callout_args(args, 1, &type, &val;;

  if (r != ONIG_NORMAL) return r;

  if (in == ONIG_CALLOUT_IN_PROGRESS) {

    if (val.c == '<')

      return ONIG_CALLOUT_SUCCESS;

  }

  else {

    if (val.c != 'X' && val.c != '<')

      return ONIG_CALLOUT_SUCCESS;

  }

  r = onig_get_arg_by_callout_args(args, 0, &type, &val;;

  if (r != ONIG_NORMAL) return r;

  fprintf(fp, "%s %s\n",

          (in == ONIG_CALLOUT_IN_PROGRESS ? "=>" : "<="),

          val.s.start);

  fflush(fp);

  return ONIG_CALLOUT_SUCCESS;

}

static int

test(OnigEncoding enc, char* in_pattern, char* in_str)

{

  int r;

  unsigned char *start, *range, *end;

  regex_t* reg;

  OnigErrorInfo einfo;

  OnigRegion *region;

  UChar* pattern;

  UChar* str;

  pattern = (UChar* )in_pattern;

  str = (UChar* )in_str;

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

               ONIG_OPTION_DEFAULT, enc, ONIG_SYNTAX_DEFAULT, &einfo);

  if (r != ONIG_NORMAL) {

    char s[ONIG_MAX_ERROR_MESSAGE_LEN];

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

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

    return -1;

  }

  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]);

    }

  }

  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);

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

  }

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

  onig_free(reg);

  return r;

}

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

{

  int r;

  int id;

  UChar* name;

  OnigEncoding use_encs[1];

  OnigType arg_types[4];

  OnigValue opt_defaults[4];

  OnigEncoding enc;

  enc = ONIG_ENCODING_UTF8;

  use_encs[0] = enc;

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

  if (r != ONIG_NORMAL) return -1;

  name = (UChar* )"echo";

  arg_types[0] = ONIG_TYPE_STRING;

  arg_types[1] = ONIG_TYPE_CHAR;

  opt_defaults[0].s.start = (UChar* )"echo";

  opt_defaults[0].s.end   = opt_defaults[0].s.start +

                                strlen((char* )opt_defaults[0].s.start);

  opt_defaults[1].c = '>';

  id = onig_set_callout_of_name(enc, ONIG_CALLOUT_TYPE_SINGLE,

                                name, name + strlen((char* )name),

                                ONIG_CALLOUT_IN_BOTH, echo, 0,

                                2, arg_types, 2, opt_defaults);

  if (id < 0) {

    fprintf(stderr, "ERROR: fail to set callout of name: %s\n", name);

    return -1;

  }

  test(enc, "(?:(*echo{abc!!!})a|b)*", "abba");

  test(enc, "(?:(*echo{xyz,X})a|b)*", "abba");

  onig_end();

  return 0;

}