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// Copyright (C) 2003 Mooffie <mooffie@typo.co.il>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
#ifndef BDE_BIDI_H
#define BDE_BIDI_H
#include "types.h"
// The purpose of the BiDi class (and the public typdefs) is to make the
// interface of the actual BiDi engine (FriBiDi) hidden from the user. This
// BiDi class could be implemented using other engines, e.g. IBM's ICU.
//
// Ideally, The BiDi class would be an abstract class from which we derive
// class FriBiDi, class ICUBiDi etc. The configre script could then tell us
// which class to use based on what engine the system has.
//
// Note that we use very little of FriBiDi. We implement reordering ourselves
// (see the comments at EditBox::reorder()).
typedef FriBidiCharType ctype_t;
typedef FriBidiLevel level_t;
enum direction_t { dirLTR, dirRTL, dirN };
enum diralgo_t { algoUnicode, algoContextStrong, algoContextRTL, algoForceLTR, algoForceRTL };
#include "univalues.h"
class BiDi {
public:
static bool mirror_char(unichar *ch) {
return fribidi_get_mirror_char(*ch, ch);
}
static bool is_space(unichar ch) {
return FRIBIDI_IS_SPACE(fribidi_get_type(ch));
}
static bool is_alnum(unichar ch) {
ctype_t ctype = fribidi_get_type(ch);
return FRIBIDI_IS_LETTER(ctype) || FRIBIDI_IS_NUMBER(ctype);
}
static bool is_nsm(unichar ch) {
return fribidi_get_type(ch) == FRIBIDI_TYPE_NSM;
}
// is_wordch() returns what constitutes a word.
static bool is_wordch(unichar ch) {
return is_alnum(ch) || is_nsm(ch);
}
static bool is_rtl(unichar ch) {
return FRIBIDI_IS_RTL(fribidi_get_type(ch));
}
static bool is_explicit_mark(unichar ch)
{
return ch == UNI_LRM ||
ch == UNI_RLM ||
ch == UNI_LRE ||
ch == UNI_RLE ||
ch == UNI_PDF ||
ch == UNI_LRO ||
ch == UNI_RLO;
}
static bool is_transparent_formatting_code(unichar ch)
{
return is_explicit_mark(ch) ||
ch == UNI_ZWNJ ||
ch == UNI_ZWJ;
}
static bool is_hebrew_nsm(unichar ch)
{
return (ch >= UNI_HEB_ETNAHTA && ch <= UNI_HEB_UPPER_DOT
|| ch == UNI_NS_UNDERSCORE)
&& (ch != UNI_HEB_MAQAF &&
ch != UNI_HEB_PASEQ &&
ch != UNI_HEB_SOF_PASUQ);
}
static bool is_arabic_nsm(unichar ch)
{
return (ch >= UNI_ARA_FATHATAN && ch <= UNI_ARA_SUKUN
|| ch == UNI_ARA_SUPERSCIPT_ALEF);
}
static bool is_cantillation_nsm(unichar ch)
{
return (ch >= UNI_HEB_ETNAHTA && ch <= UNI_HEB_MASORA_CIRCLE);
}
static void get_embedding_levels(unichar *str, idx_t len,
direction_t dir,
level_t *levels,
int line_breaks_count = 0,
idx_t *line_breaks = NULL,
bool disable_bidi = false);
static direction_t determine_base_dir(unichar *str, idx_t len,
diralgo_t dir_algo);
static void simple_log2vis(unistring &str, direction_t dir, unistring &dest);
};
#endif
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