/*

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code 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

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

/*

 *

 * (C) Copyright IBM Corp.  and others 1998-2013 - All Rights Reserved

 *

 */

#include "LETypes.h"

#include "MorphTables.h"

#include "StateTables.h"

#include "MorphStateTables.h"

#include "SubtableProcessor2.h"

#include "StateTableProcessor2.h"

#include "ContextualGlyphSubstProc2.h"

#include "LEGlyphStorage.h"

#include "LESwaps.h"

#include <stdio.h>

U_NAMESPACE_BEGIN

UOBJECT_DEFINE_RTTI_IMPLEMENTATION(ContextualGlyphSubstitutionProcessor2)

ContextualGlyphSubstitutionProcessor2::ContextualGlyphSubstitutionProcessor2(const MorphSubtableHeader2 *morphSubtableHeader)

  : StateTableProcessor2(morphSubtableHeader)

{

    contextualGlyphHeader = (const ContextualGlyphHeader2 *) morphSubtableHeader;

    le_uint32 perGlyphTableOffset = SWAPL(contextualGlyphHeader->perGlyphTableOffset);

    perGlyphTable = ((le_uint32 *) ((char *)&stateTableHeader->stHeader + perGlyphTableOffset));

    entryTable = (const ContextualGlyphStateEntry2 *) ((char *) &stateTableHeader->stHeader + entryTableOffset);

}

ContextualGlyphSubstitutionProcessor2::~ContextualGlyphSubstitutionProcessor2()

{

}

void ContextualGlyphSubstitutionProcessor2::beginStateTable()

{

    markGlyph = 0;

}

le_uint16 ContextualGlyphSubstitutionProcessor2::processStateEntry(LEGlyphStorage &glyphStorage, le_int32 &currGlyph, EntryTableIndex2 index)

{

    const ContextualGlyphStateEntry2 *entry = &entryTable[index];

    le_uint16 newState = SWAPW(entry->newStateIndex);

    le_uint16 flags = SWAPW(entry->flags);

    le_int16 markIndex = SWAPW(entry->markIndex);

    le_int16 currIndex = SWAPW(entry->currIndex);

    if (markIndex != -1) {

        le_uint32 offset = SWAPL(perGlyphTable[markIndex]);

        LEGlyphID mGlyph = glyphStorage[markGlyph];

        TTGlyphID newGlyph = lookup(offset, mGlyph);

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

    }

    if (currIndex != -1) {

        le_uint32 offset = SWAPL(perGlyphTable[currIndex]);

        LEGlyphID thisGlyph = glyphStorage[currGlyph];

        TTGlyphID newGlyph = lookup(offset, thisGlyph);

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

    }

    if (flags & cgsSetMark) {

        markGlyph = currGlyph;

    }

    if (!(flags & cgsDontAdvance)) {

        currGlyph += dir;

    }

    return newState;

}

TTGlyphID ContextualGlyphSubstitutionProcessor2::lookup(le_uint32 offset, LEGlyphID gid)

{

    LookupTable *lookupTable = ((LookupTable *) ((char *)perGlyphTable + offset));

    le_int16 format = SWAPW(lookupTable->format);

    TTGlyphID newGlyph = 0xFFFF;

    switch (format) {

        case ltfSimpleArray: {

#ifdef TEST_FORMAT

            // Disabled pending for design review

            SimpleArrayLookupTable *lookupTable0 = (SimpleArrayLookupTable *) lookupTable;

            TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);

            newGlyph = SWAPW(lookupTable0->valueArray[glyphCode]);

#endif

            break;

        }

        case ltfSegmentSingle: {

#ifdef TEST_FORMAT

            // Disabled pending for design review

            SegmentSingleLookupTable *lookupTable2 = (SegmentSingleLookupTable *) lookupTable;

            const LookupSegment *segment = lookupTable2->lookupSegment(lookupTable2->segments, gid);

            if (segment != NULL) {

                newGlyph = SWAPW(segment->value);

            }

#endif

            break;

        }

        case ltfSegmentArray: {

            printf("Context Lookup Table Format4: specific interpretation needed!\n");

            break;

        }

        case ltfSingleTable:

        {

#ifdef TEST_FORMAT

            // Disabled pending for design review

            SingleTableLookupTable *lookupTable6 = (SingleTableLookupTable *) lookupTable;

            const LookupSingle *segment = lookupTable6->lookupSingle(lookupTable6->entries, gid);

            if (segment != NULL) {

                newGlyph = SWAPW(segment->value);

            }

#endif

            break;

        }

        case ltfTrimmedArray: {

            TrimmedArrayLookupTable *lookupTable8 = (TrimmedArrayLookupTable *) lookupTable;

            TTGlyphID firstGlyph = SWAPW(lookupTable8->firstGlyph);

            TTGlyphID lastGlyph  = firstGlyph + SWAPW(lookupTable8->glyphCount);

            TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(gid);

            if ((glyphCode >= firstGlyph) && (glyphCode < lastGlyph)) {

                newGlyph = SWAPW(lookupTable8->valueArray[glyphCode - firstGlyph]);

            }

        }

        default:

            break;

    }

    return newGlyph;

}

void ContextualGlyphSubstitutionProcessor2::endStateTable()

{

}

U_NAMESPACE_END