/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   Licensed to the Apache Software Foundation (ASF) under one or more

 *   contributor license agreements. See the NOTICE file distributed

 *   with this work for additional information regarding copyright

 *   ownership. The ASF licenses this file to you under the Apache

 *   License, Version 2.0 (the "License"); you may not use this file

 *   except in compliance with the License. You may obtain a copy of

 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .

 */

#include <i18nutil/widthfolding.hxx>

#include <com/sun/star/uno/Sequence.hxx>

#include "widthfolding_data.h"

using namespace com::sun::star::uno;

namespace i18nutil {

sal_Unicode widthfolding::decompose_ja_voiced_sound_marksChar2Char (sal_Unicode inChar)

{

    if (0x30a0 <= inChar && inChar <= 0x30ff) {

      sal_Int16 i = inChar - 0x3040;

      if (decomposition_table[i].decomposited_character_1)

          return 0xFFFF;

    }

    return inChar;

}

/**

 * Decompose Japanese specific voiced and semi-voiced sound marks.

 */

OUString widthfolding::decompose_ja_voiced_sound_marks (const OUString& inStr, sal_Int32 startPos, sal_Int32 nCount, Sequence< sal_Int32 >* pOffset )

{

  // Create a string buffer which can hold nCount * 2 + 1 characters.

  // Its size may become double of nCount.

  // The reference count is 1 now.

  rtl_uString * newStr = rtl_uString_alloc(nCount * 2);

  sal_Int32 *p = nullptr;

  sal_Int32 position = 0;

  if (pOffset) {

      // Allocate double of nCount length to offset argument.

      pOffset->realloc( nCount * 2 );

      p = pOffset->getArray();

      position = startPos;

  }

  // Prepare pointers of unicode character arrays.

  const sal_Unicode* src = inStr.getStr() + startPos;

  sal_Unicode* dst = newStr->buffer;

  // Decomposition: GA --> KA + voice-mark

  while (nCount -- > 0) {

    sal_Unicode c = *src++;

    // see http://charts.unicode.org/Web/U3040.html Hiragana (U+3040..U+309F)

    // see http://charts.unicode.org/Web/U30A0.html Katakana (U+30A0..U+30FF)

    // Hiragana is not applied to decomposition.

    // Only Katakana is applied to decomposition

    if (0x30a0 <= c && c <= 0x30ff) {

      int i = int(c - 0x3040);

      sal_Unicode first = decomposition_table[i].decomposited_character_1;

      if (first != 0x0000) {

        *dst ++ = first;

        *dst ++ = decomposition_table[i].decomposited_character_2; // second

        if (pOffset) {

            *p ++ = position;

            *p ++ = position ++;

        }

        continue;

      }

    }

    *dst ++ = c;

    if (pOffset)

        *p ++ = position ++;

  }

  *dst = u'\0';

  newStr->length = sal_Int32(dst - newStr->buffer);

  if (pOffset)

      pOffset->realloc(newStr->length);

  return OUString(newStr, SAL_NO_ACQUIRE); // take ownership

}

oneToOneMapping& widthfolding::getfull2halfTable()

{

    static oneToOneMappingWithFlag table(full2half, sizeof(full2half), FULL2HALF_NORMAL);

    table.makeIndex();

    return table;

}

/**

 * Compose Japanese specific voiced and semi-voiced sound marks.

 */

OUString widthfolding::compose_ja_voiced_sound_marks (const OUString& inStr, sal_Int32 startPos, sal_Int32 nCount, Sequence< sal_Int32 >* pOffset, sal_Int32 nFlags )

{

  // Create a string buffer which can hold nCount + 1 characters.

  // Its size may become equal to nCount or smaller.

  // The reference count is 1 now.

  rtl_uString * newStr = rtl_uString_alloc(nCount);

  // Prepare pointers of unicode character arrays.

  const sal_Unicode* src = inStr.getStr() + startPos;

  sal_Unicode* dst = newStr->buffer;

  // This conversion algorithm requires at least one character.

  if (nCount > 0) {

      // .. .. KA         VOICE .. ..

      //       ^          ^

      //       previousChar   currentChar

      //       ^

      //       position

      //

      // will be converted to

      // .. .. GA       .. ..

      sal_Int32 *p = nullptr;

      sal_Int32 position = 0;

      if (pOffset) {

          // Allocate nCount length to offset argument.

          pOffset->realloc( nCount );

          p = pOffset->getArray();

          position = startPos;

      }

      //

      sal_Unicode previousChar = *src ++;

      sal_Unicode currentChar;

      // Composition: KA + voice-mark --> GA

      while (-- nCount > 0) {

        currentChar = *src ++;

        // see http://charts.unicode.org/Web/U3040.html Hiragana (U+3040..U+309F)

        // see http://charts.unicode.org/Web/U30A0.html Katakana (U+30A0..U+30FF)

        // 0x3099 COMBINING KATAKANA-HIRAGANA VOICED SOUND MARK

        // 0x309a COMBINING KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK

        // 0x309b KATAKANA-HIRAGANA VOICED SOUND MARK

        // 0x309c KATAKANA-HIRAGANA SEMI-VOICED SOUND MARK

        int j = currentChar - 0x3099; // 0x3099, 0x309a, 0x309b, 0x309c ?

        if (2 <= j && j <= 3) // 0x309b or 0x309c

            j -= 2;

        if (0 <= j && j <= 1) {

          // 0 addresses a code point regarding 0x3099 or 0x309b (voiced sound mark),

          // 1 is 0x309a or 0x309c (semi-voiced sound mark)

          int i = int(previousChar - 0x3040); // i acts as an index of array

          bool bCompose = false;

          if (0 <= i && i <= (0x30ff - 0x3040) && composition_table[i][j])

            bCompose = true;

          // not to use combined KATAKANA LETTER VU

          if ( previousChar == 0x30a6 && (nFlags & WIDTHFOLDING_DONT_USE_COMBINED_VU) )

            bCompose = false;

          if( bCompose ){

            if (pOffset) {

                position ++;

                *p ++ = position ++;

            }

            *dst ++ =  composition_table[i][j];

            previousChar = *src ++;

            nCount --;

            continue;

          }

        }

        if (pOffset)

            *p ++ = position ++;

        *dst ++ = previousChar;

        previousChar = currentChar;

      }

      if (nCount == 0) {

        if (pOffset)

            *p = position;

        *dst ++ = previousChar;

      }

      *dst = u'\0';

      newStr->length = sal_Int32(dst - newStr->buffer);

  }

  if (pOffset)

      pOffset->realloc(newStr->length);

  return OUString(newStr, SAL_NO_ACQUIRE); // take ownership

}

oneToOneMapping& widthfolding::gethalf2fullTable()

{

    static oneToOneMappingWithFlag table(half2full, sizeof(half2full), HALF2FULL_NORMAL);

    table.makeIndex();

    return table;

}

sal_Unicode widthfolding::getCompositionChar(sal_Unicode c1, sal_Unicode c2)

{

    return composition_table[c1 - 0x3040][c2 - 0x3099];

}

oneToOneMapping& widthfolding::getfull2halfTableForASC()

{

    static oneToOneMappingWithFlag table(full2half, sizeof(full2half), FULL2HALF_ASC_FUNCTION);

    table.makeIndex();

    return table;

}

oneToOneMapping& widthfolding::gethalf2fullTableForJIS()

{

    static oneToOneMappingWithFlag table(half2full, sizeof(half2full), HALF2FULL_JIS_FUNCTION);

    table.makeIndex();

    return table;

}

oneToOneMapping& widthfolding::getfullKana2halfKanaTable()

{

    static oneToOneMappingWithFlag table(full2half, sizeof(full2half), FULL2HALF_KATAKANA_ONLY);

    table.makeIndex();

    return table;

}

oneToOneMapping& widthfolding::gethalfKana2fullKanaTable()

{

    static oneToOneMappingWithFlag table(half2full, sizeof(half2full), HALF2FULL_KATAKANA_ONLY);

    table.makeIndex();

    return table;

}

}

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