ignoreKiKuFollowedBySa_ja_JP.cxx

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * This file incorporates work covered by the following license notice:
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 *   Licensed to the Apache Software Foundation (ASF) under one or more
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 */
 
#include <transliteration_Ignore.hxx>
 
#include <numeric>
 
using namespace com::sun::star::uno;
using namespace com::sun::star::lang;
 
namespace i18npool {
 
OUString
ignoreKiKuFollowedBySa_ja_JP::foldingImpl( const OUString& inStr, sal_Int32 startPos, sal_Int32 nCount, Sequence< sal_Int32 >* pOffset )
{
    // Create a string buffer which can hold nCount + 1 characters.
    // The reference count is 1 now.
    rtl_uString * newStr = rtl_uString_alloc(nCount);
    sal_Unicode * dst = newStr->buffer;
    const sal_Unicode * src = inStr.getStr() + startPos;
 
    if (pOffset) {
        // Allocate nCount length to offset argument.
        pOffset->realloc( nCount );
        auto [begin, end] = asNonConstRange(*pOffset);
        std::iota(begin, end, startPos);
    }
 
 
    sal_Unicode previousChar = *src ++;
    sal_Unicode currentChar;
 
    // Translation
    while (-- nCount > 0) {
        currentChar = *src ++;
 
        // KU + Sa-So --> KI + Sa-So
        if (previousChar == 0x30AF ) { // KATAKANA LETTER KU
            if (0x30B5 <= currentChar && // KATAKANA LETTER SA
                    currentChar <= 0x30BE) { // KATAKANA LETTER ZO
                *dst ++ = 0x30AD;          // KATAKANA LETTER KI
                *dst ++ = currentChar;
                previousChar = *src ++;
                nCount --;
                continue;
            }
        }
 
        *dst ++ = previousChar;
        previousChar = currentChar;
    }
 
    if (nCount == 0) {
        *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
}
 
}
 
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