path: root/fribidi_char_sets_cap_rtl.c

/* FriBidi - Library of BiDi algorithm
 * Copyright (C) 1999,2000 Dov Grobgeld, and
 * Copyright (C) 2001,2002 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307, USA
 * 
 * For licensing issues, contact <dov@imagic.weizmann.ac.il> and
 * <fwpg@sharif.edu>.
 */

#include "fribidi_config.h"
#ifndef FRIBIDI_NO_CHARSETS

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

FRIBIDI_API FriBidiCharType fribidi_get_type_internal (FriBidiChar uch);

#define WS FRIBIDI_PROP_TYPE_WS
#define BS FRIBIDI_PROP_TYPE_BS
#define EO FRIBIDI_PROP_TYPE_EO
#define CTL FRIBIDI_PROP_TYPE_CTL
#define LRE FRIBIDI_PROP_TYPE_LRE
#define RLE FRIBIDI_PROP_TYPE_RLE
#define ES FRIBIDI_PROP_TYPE_ES
#define LRO FRIBIDI_PROP_TYPE_LRO
#define RLO FRIBIDI_PROP_TYPE_RLO
#define AL FRIBIDI_PROP_TYPE_AL
#define SS FRIBIDI_PROP_TYPE_SS
#define ET FRIBIDI_PROP_TYPE_ET
#define NSM FRIBIDI_PROP_TYPE_NSM
#define LTR FRIBIDI_PROP_TYPE_LTR
#define ON FRIBIDI_PROP_TYPE_ON
#define AN FRIBIDI_PROP_TYPE_AN
#define BN FRIBIDI_PROP_TYPE_BN
#define RTL FRIBIDI_PROP_TYPE_RTL
#define CS FRIBIDI_PROP_TYPE_CS
#define PDF FRIBIDI_PROP_TYPE_PDF
#define EN FRIBIDI_PROP_TYPE_EN

static FriBidiPropCharType CapRTLCharTypes[] = {
/* *INDENT-OFF* */
  ON, ON, ON, ON, LTR,RTL,ON, ON, ON, ON, ON, ON, ON, BS, RLO,RLE, /* 00-0f */
  LRO,LRE,PDF,WS, ON, ON, ON, ON, ON, ON, ON, ON, ON, ON, ON, ON,  /* 10-1f */
  WS, ON, ON, ON, ET, ON, ON, ON, ON, ON, ON, ET, CS, ON, ES, ES,  /* 20-2f */
  EN, EN, EN, EN, EN, EN, AN, AN, AN, AN, CS, ON, ON, ON, ON, ON,  /* 30-3f */
  RTL,AL, AL, AL, AL, AL, AL, RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL, /* 40-4f */
  RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL,RTL,ON, BS, ON, ON, ON,  /* 50-5f */
  NSM,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR, /* 60-6f */
  LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,LTR,ON, SS, ON, WS, ON,  /* 70-7f */
/* *INDENT-ON* */
};

#undef WS
#undef BS
#undef EO
#undef CTL
#undef LRE
#undef RLE
#undef ES
#undef LRO
#undef RLO
#undef AL
#undef SS
#undef ET
#undef NSM
#undef LTR
#undef ON
#undef AN
#undef BN
#undef RTL
#undef CS
#undef PDF
#undef EN

#define CAPRTL_CHARS (sizeof CapRTLCharTypes / sizeof CapRTLCharTypes[0])

static FriBidiChar *caprtl_to_unicode = NULL;

char
fribidi_unicode_to_cap_rtl_c (FriBidiChar uch)
{
  int i;
  for (i = 0; i < CAPRTL_CHARS; i++)
    if (uch == caprtl_to_unicode[i])
      return (char) i;
  return '?';
}

int
fribidi_cap_rtl_to_unicode (char *s,
			    int len,
			    FriBidiChar *us)
{
  int i, j;

  j = 0;
  for (i = 0; i < len; i++)
    {
      char ch;

      ch = s[i];
      if (ch == '_')
	{
	  switch (ch = s[++i])
	    {
	    case '>':
	      us[j++] = UNI_LRM;
	      break;
	    case '<':
	      us[j++] = UNI_RLM;
	      break;
	    case 'l':
	      us[j++] = UNI_LRE;
	      break;
	    case 'r':
	      us[j++] = UNI_RLE;
	      break;
	    case 'o':
	      us[j++] = UNI_PDF;
	      break;
	    case 'L':
	      us[j++] = UNI_LRO;
	      break;
	    case 'R':
	      us[j++] = UNI_RLO;
	      break;
	    case '_':
	      us[j++] = '_';
	      break;
	    default:
	      us[j++] = '_';
	      i--;
	      break;
	    }
	}
      else
	us[j++] = caprtl_to_unicode[(int) s[i]];
    }

  return j;
}

int
fribidi_unicode_to_cap_rtl (FriBidiChar *us,
			    int length,
			    char *s)
{
  int i, j;

  j = 0;
  for (i = 0; i < length; i++)
    {
      FriBidiChar ch = us[i];
      if (!FRIBIDI_IS_EXPLICIT (fribidi_get_type_internal (ch)) && ch != '_'
	  && ch != UNI_LRM && ch != UNI_RLM)
	s[j++] = fribidi_unicode_to_cap_rtl_c (ch);
      else
	{
	  s[j++] = '_';
	  switch (ch)
	    {
	    case UNI_LRM:
	      s[j++] = '>';
	      break;
	    case UNI_RLM:
	      s[j++] = '<';
	      break;
	    case UNI_LRE:
	      s[j++] = 'l';
	      break;
	    case UNI_RLE:
	      s[j++] = 'r';
	      break;
	    case UNI_PDF:
	      s[j++] = 'o';
	      break;
	    case UNI_LRO:
	      s[j++] = 'L';
	      break;
	    case UNI_RLO:
	      s[j++] = 'R';
	      break;
	    case '_':
	      s[j++] = '_';
	      break;
	    default:
	      j--;
	      if (ch < 256)
		s[j++] = fribidi_unicode_to_cap_rtl_c (ch);
	      else
		s[j++] = '?';
	      break;
	    }
	}
    }
  s[j] = 0;

  return j;
}

char *
fribidi_char_set_desc_cap_rtl (void)
{
  static char *s = 0;
  int l, i, j;

  if (s)
    return s;

  l = 4000;
  s = (char *) fribidi_malloc (NULL, l);
  i = 0;
  i += snprintf (s + i, l - i,
		 "CapRTL is a character set for testing with the reference\n"
		 "implementation, with explicit marks escape strings, and\n"
		 "the property that contains all unicode character types in\n"
		 "ASCII range 1-127.\n"
		 "\n"
		 "Warning: CapRTL character types are subject to change.\n"
		 "\n" "CapRTL's character types:\n");
  for (j = 0; j < CAPRTL_CHARS; j++)
    {
      if (j % 4 == 0)
	s[i++] = '\n';
      i += snprintf (s + i, l - i, "  * 0x%02x %c%c %-3s ", j,
		     j < 0x20 ? '^' : ' ',
		     j < 0x20 ? j + '@' : j < 0x7f ? j : ' ',
		     fribidi_type_name (fribidi_prop_to_type
					[(unsigned char)
					 CapRTLCharTypes[j]]));
    }
  i += snprintf (s + i, l - i,
		 "\n\n"
		 "Escape sequences:\n"
		 "  Character `_' is used to escape explicit marks. The list is:\n"
		 "    * _>  LRM\n"
		 "    * _<  RLM\n"
		 "    * _l  LRE\n"
		 "    * _r  RLE\n"
		 "    * _L  LRO\n"
		 "    * _R  RLO\n" "    * _o  PDF\n" "    * __  `_' itself\n"
		 "\n");
  return s;
}

fribidi_boolean
fribidi_char_set_enter_cap_rtl (void)
{
  if (!caprtl_to_unicode)
    {
      int request[FRIBIDI_TYPES_COUNT + 1];
      int i, count;

      caprtl_to_unicode =
	(FriBidiChar *) fribidi_malloc (NULL,
					CAPRTL_CHARS *
					sizeof caprtl_to_unicode[0]);
      for (i = 0; i < FRIBIDI_TYPES_COUNT; i++)
	request[i] = 0;
      for (i = 0; i < CAPRTL_CHARS; i++)
	if (fribidi_get_mirror_char (NULL, i, NULL))
	  caprtl_to_unicode[i] = i;
      for (count = 0, i = 0; i < CAPRTL_CHARS; i++)
	if (caprtl_to_unicode[i] == 0)
	  {
	    request[(unsigned char) CapRTLCharTypes[i]]++;
	    count++;
	  }
      for (i = 1; i < 0x10000 && count; i++)	/* Assign BMP chars to CapRTL entries */
	if (!fribidi_get_mirror_char (NULL, i, NULL))
	  {
	    int j, k;
	    for (j = 0; j < FRIBIDI_TYPES_COUNT; j++)
	      if (fribidi_prop_to_type[j] == fribidi_get_type_internal (i))
		break;
	    if (!request[j])	/* Do not need this type */
	      continue;
	    for (k = 0; k < CAPRTL_CHARS; k++)
	      if (!caprtl_to_unicode[k] && j == CapRTLCharTypes[k])
		break;
	    if (k < CAPRTL_CHARS)
	      {
		request[j]--;
		count--;
		caprtl_to_unicode[k] = i;
	      }
	  }
    }

  return FRIBIDI_TRUE;
}

fribidi_boolean
fribidi_char_set_leave_cap_rtl (void)
{
  return FRIBIDI_TRUE;
}

#endif