///////////////////////////////////////////////////////////////////////////////
//
//                          IMPORTANT NOTICE
//
// The following open source license statement does not apply to any
// entity in the Exception List published by FMSoft.
//
// For more information, please visit:
//
// https://www.fmsoft.cn/exception-list
//
//////////////////////////////////////////////////////////////////////////////
/* MGBidi
 * gen-mirroring-tab.c - generate unicode-bidi-mirroring-table.h
 *
 * Revised from FriBidi by Vincent Wei for MiniGUI 4.0.0
 *
 * Authors of FriBidi:
 *   Behdad Esfahbod, 2001, 2002, 2004
 *
 * Copyright (C) 2004 Sharif FarsiWeb, Inc
 * Copyright (C) 2001,2002,2004 Behdad Esfahbod
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library, in a file named COPYING; if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA
 * 
 * For licensing issues, contact <fribidi.license@gmail.com>.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "common.h"
#include "minigui.h"
#include "gdi.h"

#include "packtab.h"

#include "../unicode-bidi.h"
#include "unicode-version.h"

#define appname "gen-mirroring-tab"
#define outputname "unicode-bidi-mirroring-table.inc"

static void
die (
  const char *msg
)
{
  fprintf (stderr, appname ": %s\n", msg);
  exit (1);
}

static void
die2 (
  const char *fmt,
  const char *p
)
{
  fprintf (stderr, appname ": ");
  fprintf (stderr, fmt, p);
  fprintf (stderr, "\n");
  exit (1);
}

static void
die4 (
  const char *fmt,
  unsigned long l,
  unsigned long p,
  unsigned long q
)
{
  fprintf (stderr, appname ": ");
  fprintf (stderr, fmt, l, p, q);
  fprintf (stderr, "\n");
  exit (1);
}

#define table_name "Mir"
#define macro_name "UNIBIDI_GET_MIRRORING"

static signed int table[UNIBIDI_UNICODE_CHARS];
static char buf[4000];
static signed long max_dist;

static void
init (
  void
)
{
  max_dist = 0;
}

static void
clear_tab (
  void
)
{
  register Uchar32 c;

  for (c = 0; c < UNIBIDI_UNICODE_CHARS; c++)
    table[c] = 0;
}

static void
init_tab_mirroring_txt (
  void
)
{
  clear_tab ();
}

static void
read_bidi_mirroring_txt (
  FILE *f
)
{
  unsigned long l;

  init_tab_mirroring_txt ();

  l = 0;
  while (fgets (buf, sizeof buf, f))
    {
      unsigned long i, j;
      signed long dist;
      int k;
      const char *s = buf;

      l++;

      while (*s == ' ')
        s++;

      if (s[0] == '#' || s[0] == '\0' || s[0] == '\n')
        continue;

      k = sscanf (s, "%lx; %lx", &i, &j);
      if (k != 2 || i >= UNIBIDI_UNICODE_CHARS || j >= UNIBIDI_UNICODE_CHARS)
        die4 ("invalid pair in input at line %ld: %04lX, %04lX", l, i, j);
      dist = ((signed long) j - (signed long) i);
      table[i] = dist;
      if (dist > max_dist)
        max_dist = dist;
      else if (-dist > max_dist)
        max_dist = -dist;
    }
}

static void
read_data (
  const char *data_file_type,
  const char *data_file_name
)
{
  FILE *f;

  if (!(f = fopen (data_file_name, "rt")))
    die2 ("error: cannot open `%s' for reading", data_file_name);

  if (!strcmp (data_file_type, "BidiMirroring.txt"))
    read_bidi_mirroring_txt (f);
  else
    die2 ("error: unknown data-file-type %s", data_file_type);

  fclose (f);
}

static void
gen_mirroring_tab (
  int max_depth,
  const char *data_file_type
)
{
  int key_bytes;
  const char *key_type;

  printf ("/* " outputname "\n * generated by " appname "\n"
          " * from the file %s of Unicode version "
          UNIBIDI_UNICODE_VERSION ". */\n\n", data_file_type);

  printf ("#define PACKTAB_UINT8 Uint8\n"
          "#define PACKTAB_UINT16 Uint16\n"
          "#define PACKTAB_UINT32 Uint32\n\n");

  key_bytes = max_dist <= 0x7f ? 1 : max_dist < 0x7fff ? 2 : 4;
  key_type = key_bytes == 1 ? "Sint8" : key_bytes == 2 ?
    "Sint16" : "Sint32";

  if (!pack_table
      (table, UNIBIDI_UNICODE_CHARS, key_bytes, 0, max_depth, 1, NULL,
       key_type, table_name, macro_name "_DELTA", stdout))
    die ("error: insufficient memory, decrease max_depth");

  printf ("#undef PACKTAB_UINT8\n"
          "#undef PACKTAB_UINT16\n"
          "#undef PACKTAB_UINT32\n\n");

  printf ("#define " macro_name "(x) ((x) + " macro_name "_DELTA(x))\n\n");

  printf ("/* End of generated " outputname " */\n");
}

int
main (
  int argc,
  const char **argv
)
{
  const char *data_file_type = "BidiMirroring.txt";

  if (argc < 3)
    die2 ("usage:\n  " appname " max-depth /path/to/%s [junk...]",
          data_file_type);

  {
    int max_depth = atoi (argv[1]);
    const char *data_file_name = argv[2];

    if (max_depth < 2)
      die ("invalid depth");

    init ();
    read_data (data_file_type, data_file_name);
    gen_mirroring_tab (max_depth, data_file_type);
  }

  return 0;
}
