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/**
* Yudit Unicode Editor Source File
*
* GNU Copyright (C) 1997-2023 Gaspar Sinai <gaspar@yudit.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* dated June 1991. See file COPYYING for details.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "stoolkit/SEmbedState.h"
#include "stoolkit/SCharClass.h"
#include "stoolkit/STypes.h"
static SS_UCS4 stateMap[4] =
{
SD_CD_LRO, SD_CD_LRE,
SD_CD_RLO, SD_CD_RLE,
};
/**
* This is a state class that stores the embedding history.
* Currently it supports 32+32/4 = 16 embedding levels.
* To support more you need to add exstatexx.
*/
/**
* Check if state is equal
*/
bool
SEmbedState::operator==(const SEmbedState& es) const
{
return (explevel == es.explevel
&& memcmp (states, es.states, sizeof (states)) == 0);
}
/**
* Check if state is not equal
*/
bool
SEmbedState::operator!=(const SEmbedState& es) const
{
return (explevel != es.explevel
|| memcmp (states, es.states, sizeof (states)) != 0);
}
/**
* exstate0 and exstate1 are operated with this.
@ @param level is the current (real) level
* @return an index into stateMap
*/
unsigned int
SEmbedState::getMark(unsigned int level) const
{
unsigned int line = level/8;
unsigned int index = (level%8)*4;
return ((states[line] >> index) & 0x3);
}
/**
* exstate0 and exstate1 are operated with this.
@ @param level is the current (real) level
* @mark is an index into stateMap
*/
void
SEmbedState::setMark (unsigned int level, unsigned int _mark)
{
unsigned int line = level/8;
unsigned int index = (level%8)*4;
unsigned int mask = ((0x3 << index) ^ 0xffffffff);
states[line] = states[line] & mask;
states[line] = states[line] | (_mark << index);
}
/* Return embedding marks */
SV_UCS4
SEmbedState::getEmbeddingMarks (const SEmbedState* from) const
{
SV_UCS4 ret;
unsigned int depfrom = (from==0) ? 0 : from->getDepth();
unsigned int depto = getDepth();
unsigned int min = (depfrom < depto) ? depfrom : depto;
/* skip the common ones */
unsigned int i = 0;
for (i=0; i<min; i++)
{
if (from->getMark(i)!=getMark(i)) break;
}
/* fill in the space with PDF */
for (unsigned int j=i; j<depfrom; j++)
{
ret.append (SD_CD_PDF);
}
while (i<depto)
{
ret.append (stateMap[getMark(i)]);
i++;
}
return SV_UCS4(ret);
}
/*
* Get the *real* embedding depth, not the Unicode algorithm crap:
* For that you need: getExplicitLevel()
*/
unsigned int
SEmbedState::getDepth () const
{
unsigned ret = 0;
unsigned int to = getExplicitLevel();
unsigned int mark;
unsigned int i=0;
unsigned int emb = 0;
while ( emb<to )
{
ret++;
mark = getMark(i);
i++;
/* inc twice needed for RL and 1 and LR and 0 */
if (mark>=2 && (emb&1) == 1) emb++;
if (mark<2 && (emb&1) == 0) emb++;
emb++;
}
return ret;
}
/**
* Set the overriding state from stack
* Stack can contain only glyphs that are in stateMap.
*/
void
SEmbedState::setEmbeddingMarks (const SV_UCS4& stack)
{
memset (states, 0, sizeof (states));
explevel = 0;
/* our max embedding is 16 */
unsigned int level = 0;
for (unsigned int i=0; i<stack.size() && i <= SD_BIDI_MAX_EMBED; i++)
{
unsigned int mark = 0;
bool override = false;
/* find our mark */
switch (stack[i])
{
/* These are in this order in stateMap */
case SD_CD_LRO:
mark = 0;
override = true;
break;
case SD_CD_LRE:
mark = 1;
break;
case SD_CD_RLO:
mark = 2;
override = true;
break;
case SD_CD_RLE:
mark = 3;
break;
default:
continue;
}
// RLO rnd RLE is at 2 and 3
if ((mark==2 || mark == 3) && (level&1) == 1)
{
if (level+2 > SD_BIDI_MAX_EMBED) break;
level++;
level++;
}
else if ((mark==0 || mark == 1) && (level&1) == 0)
{
if (level+2 > SD_BIDI_MAX_EMBED) break;
level++;
level++;
}
else
{
if (level+1 > SD_BIDI_MAX_EMBED) break;
level++;
}
/* RL is 2 and 3 */
setExplicitLevel (level, override);
setMark (i, mark);
}
return;
}
/**
* Used for debug.
*/
SString
SEmbedState::toString() const
{
SString ret;
ret.append ("[");
char s[12];
SV_UCS4 v = getEmbeddingMarks(0);
const char* c = "";
for (unsigned int i=0; i<v.size(); i++)
{
snprintf (s, 12, "%s%04X", c, (unsigned int)v[i]);
c = " ";
ret.append (s);
}
ret.append ("]");
return SString(ret);
}
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