/*

 *

 * (C) Copyright IBM Corp. 1998-2004 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "MorphTables.h"

#include "StateTables.h"

#include "MorphStateTables.h"

#include "SubtableProcessor.h"

#include "StateTableProcessor.h"

#include "ContextualGlyphSubstProc.h"

#include "LEGlyphStorage.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor)

ContextualGlyphSubstitutionProcessor::ContextualGlyphSubstitutionProcessor(const MorphSubtableHeader *morphSubtableHeader)

  : StateTableProcessor(morphSubtableHeader)

{

    contextualGlyphSubstitutionHeader = (const ContextualGlyphSubstitutionHeader *) morphSubtableHeader;

    substitutionTableOffset = SWAPW(contextualGlyphSubstitutionHeader->substitutionTableOffset);

    entryTable = (const ContextualGlyphSubstitutionStateEntry *) ((char *) &stateTableHeader->stHeader + entryTableOffset);

}

ContextualGlyphSubstitutionProcessor::~ContextualGlyphSubstitutionProcessor()

{

}

void ContextualGlyphSubstitutionProcessor::beginStateTable()

{

    markGlyph = 0;

}

ByteOffset ContextualGlyphSubstitutionProcessor::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex index)

{

    const ContextualGlyphSubstitutionStateEntry *entry = &entryTable[index];

    ByteOffset newState = SWAPW(entry->newStateOffset);

    le_int16 flags = SWAPW(entry->flags);

    WordOffset markOffset = SWAPW(entry->markOffset);

    WordOffset currOffset = SWAPW(entry->currOffset);

    if (markOffset != 0) {

        const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + markOffset * 2);

        LEGlyphID mGlyph = glyphStorage[markGlyph];

        TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(mGlyph)]);

         glyphStorage[markGlyph] = LE_SET_GLYPH(mGlyph, newGlyph);

    }

    if (currOffset != 0) {

        const le_int16 *table = (const le_int16 *) ((char *) &stateTableHeader->stHeader + currOffset * 2);

        LEGlyphID thisGlyph = glyphStorage[currGlyph];

        TTGlyphID newGlyph = SWAPW(table[LE_GET_GLYPH(thisGlyph)]);

        glyphStorage[currGlyph] = LE_SET_GLYPH(thisGlyph, newGlyph);

    }

    if (flags & cgsSetMark) {

        markGlyph = currGlyph;

    }

    if (!(flags & cgsDontAdvance)) {

        // should handle reverse too!

        currGlyph += 1;

    }

    return newState;

}

void ContextualGlyphSubstitutionProcessor::endStateTable()

{

}

U_NAMESPACE_END