/*

 *

 * (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 "LEGlyphStorage.h"

#include "LESwaps.h"

U_NAMESPACE_BEGIN

StateTableProcessor::StateTableProcessor()

{

}

StateTableProcessor::StateTableProcessor(const MorphSubtableHeader *morphSubtableHeader)

  : SubtableProcessor(morphSubtableHeader)

{

    stateTableHeader = (const MorphStateTableHeader *) morphSubtableHeader;

    stateSize = SWAPW(stateTableHeader->stHeader.stateSize);

    classTableOffset = SWAPW(stateTableHeader->stHeader.classTableOffset);

    stateArrayOffset = SWAPW(stateTableHeader->stHeader.stateArrayOffset);

    entryTableOffset = SWAPW(stateTableHeader->stHeader.entryTableOffset);

    classTable = (const ClassTable *) ((char *) &stateTableHeader->stHeader + classTableOffset);

    firstGlyph = SWAPW(classTable->firstGlyph);

    lastGlyph  = firstGlyph + SWAPW(classTable->nGlyphs);

}

StateTableProcessor::~StateTableProcessor()

{

}

void StateTableProcessor::process(LEGlyphStorage &glyphStorage)

{

    // Start at state 0

    // XXX: How do we know when to start at state 1?

    ByteOffset currentState = stateArrayOffset;

    // XXX: reverse? 

    le_int32 currGlyph = 0;

    le_int32 glyphCount = glyphStorage.getGlyphCount();

    beginStateTable();

    while (currGlyph <= glyphCount) {

        ClassCode classCode = classCodeOOB;

        if (currGlyph == glyphCount) {

            // XXX: How do we handle EOT vs. EOL?

            classCode = classCodeEOT;

        } else {

            TTGlyphID glyphCode = (TTGlyphID) LE_GET_GLYPH(glyphStorage[currGlyph]);

            if (glyphCode == 0xFFFF) {

                classCode = classCodeDEL;

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

                classCode = classTable->classArray[glyphCode - firstGlyph];

            }

        }

        const EntryTableIndex *stateArray = (const EntryTableIndex *) ((char *) &stateTableHeader->stHeader + currentState);

        EntryTableIndex entryTableIndex = stateArray[(le_uint8)classCode];

        currentState = processStateEntry(glyphStorage, currGlyph, entryTableIndex);

    }

    endStateTable();

}

U_NAMESPACE_END