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/* Pango
* pango-bidi-type.c: Bidirectional Character Types
*
* Copyright (C) 2008 Jürg Billeter <j@bitron.ch>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <string.h>
#include "pango-bidi-type.h"
#include "pango-utils.h"
#include "mini-fribidi/fribidi.h"
/**
* pango_bidi_type_for_unichar
* @ch: a Unicode character
*
* Determines the normative bidirectional character type of a
* character, as specified in the Unicode Character Database.
*
* A simplified version of this function is available as
* pango_unichar_get_direction().
*
* Return value: the bidirectional character type, as used in the
* Unicode bidirectional algorithm.
*
* Since: 1.22
*/
PangoBidiType
pango_bidi_type_for_unichar (gunichar ch)
{
FriBidiCharType fribidi_ch_type = fribidi_get_type (ch);
switch (fribidi_ch_type)
{
case FRIBIDI_TYPE_LTR: return PANGO_BIDI_TYPE_L;
case FRIBIDI_TYPE_LRE: return PANGO_BIDI_TYPE_LRE;
case FRIBIDI_TYPE_LRO: return PANGO_BIDI_TYPE_LRO;
case FRIBIDI_TYPE_RTL: return PANGO_BIDI_TYPE_R;
case FRIBIDI_TYPE_AL: return PANGO_BIDI_TYPE_AL;
case FRIBIDI_TYPE_RLE: return PANGO_BIDI_TYPE_RLE;
case FRIBIDI_TYPE_RLO: return PANGO_BIDI_TYPE_RLO;
case FRIBIDI_TYPE_PDF: return PANGO_BIDI_TYPE_PDF;
case FRIBIDI_TYPE_EN: return PANGO_BIDI_TYPE_EN;
case FRIBIDI_TYPE_ES: return PANGO_BIDI_TYPE_ES;
case FRIBIDI_TYPE_ET: return PANGO_BIDI_TYPE_ET;
case FRIBIDI_TYPE_AN: return PANGO_BIDI_TYPE_AN;
case FRIBIDI_TYPE_CS: return PANGO_BIDI_TYPE_CS;
case FRIBIDI_TYPE_NSM: return PANGO_BIDI_TYPE_NSM;
case FRIBIDI_TYPE_BN: return PANGO_BIDI_TYPE_BN;
case FRIBIDI_TYPE_BS: return PANGO_BIDI_TYPE_B;
case FRIBIDI_TYPE_SS: return PANGO_BIDI_TYPE_S;
case FRIBIDI_TYPE_WS: return PANGO_BIDI_TYPE_WS;
case FRIBIDI_TYPE_ON: return PANGO_BIDI_TYPE_ON;
default:
g_assert_not_reached ();
return PANGO_BIDI_TYPE_ON;
}
}
/* Some bidi-related functions */
/**
* pango_log2vis_get_embedding_levels:
* @text: the text to itemize.
* @length: the number of bytes (not characters) to process, or -1
* if @text is nul-terminated and the length should be calculated.
* @pbase_dir: input base direction, and output resolved direction.
*
* This will return the bidirectional embedding levels of the input paragraph
* as defined by the Unicode Bidirectional Algorithm available at:
*
* http://www.unicode.org/reports/tr9/
*
* If the input base direction is a weak direction, the direction of the
* characters in the text will determine the final resolved direction.
*
* Return value: a newly allocated array of embedding levels, one item per
* character (not byte), that should be freed using g_free.
*
* Since: 1.4
*/
guint8 *
pango_log2vis_get_embedding_levels (const gchar *text,
int length,
PangoDirection *pbase_dir)
{
FriBidiCharType fribidi_base_dir;
guint8 *embedding_levels_list;
switch (*pbase_dir)
{
case PANGO_DIRECTION_LTR:
case PANGO_DIRECTION_TTB_RTL:
fribidi_base_dir = FRIBIDI_TYPE_L;
break;
case PANGO_DIRECTION_RTL:
case PANGO_DIRECTION_TTB_LTR:
fribidi_base_dir = FRIBIDI_TYPE_R;
break;
case PANGO_DIRECTION_WEAK_RTL:
fribidi_base_dir = FRIBIDI_TYPE_WR;
break;
case PANGO_DIRECTION_WEAK_LTR:
case PANGO_DIRECTION_NEUTRAL:
default:
fribidi_base_dir = FRIBIDI_TYPE_WL;
break;
}
#ifdef FRIBIDI_HAVE_UTF8
{
if (length < 0)
length = strlen (text);
embedding_levels_list = (guint8 *) fribidi_log2vis_get_embedding_levels_new_utf8 (text, length, &fribidi_base_dir);
}
#else
{
gunichar *text_ucs4;
int n_chars;
text_ucs4 = g_utf8_to_ucs4_fast (text, length, &n_chars);
embedding_levels_list = g_new (guint8, n_chars);
fribidi_log2vis_get_embedding_levels ((FriBidiChar*)text_ucs4, n_chars,
&fribidi_base_dir,
(FriBidiLevel*)embedding_levels_list);
g_free (text_ucs4);
}
#endif
*pbase_dir = (fribidi_base_dir == FRIBIDI_TYPE_L) ? PANGO_DIRECTION_LTR : PANGO_DIRECTION_RTL;
return embedding_levels_list;
}
/**
* pango_unichar_direction:
* @ch: a Unicode character
*
* Determines the inherent direction of a character; either
* %PANGO_DIRECTION_LTR, %PANGO_DIRECTION_RTL, or
* %PANGO_DIRECTION_NEUTRAL.
*
* This function is useful to categorize characters into left-to-right
* letters, right-to-left letters, and everything else. If full
* Unicode bidirectional type of a character is needed,
* pango_bidi_type_for_gunichar() can be used instead.
*
* Return value: the direction of the character.
*/
PangoDirection
pango_unichar_direction (gunichar ch)
{
FriBidiCharType fribidi_ch_type = fribidi_get_type (ch);
if (!FRIBIDI_IS_STRONG (fribidi_ch_type))
return PANGO_DIRECTION_NEUTRAL;
else if (FRIBIDI_IS_RTL (fribidi_ch_type))
return PANGO_DIRECTION_RTL;
else
return PANGO_DIRECTION_LTR;
}
/**
* pango_get_mirror_char:
* @ch: a Unicode character
* @mirrored_ch: location to store the mirrored character
*
* If @ch has the Unicode mirrored property and there is another Unicode
* character that typically has a glyph that is the mirror image of @ch's
* glyph, puts that character in the address pointed to by @mirrored_ch.
*
* Use g_unichar_get_mirror_char() instead; the docs for that function
* provide full details.
*
* Return value: %TRUE if @ch has a mirrored character and @mirrored_ch is
* filled in, %FALSE otherwise
**/
gboolean
pango_get_mirror_char (gunichar ch,
gunichar *mirrored_ch)
{
return g_unichar_get_mirror_char (ch, mirrored_ch);
}
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