scripttypedetector.cxx

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#include <com/sun/star/i18n/ScriptDirection.hpp>
#include <com/sun/star/i18n/UnicodeScript.hpp>
#include <i18nutil/scripttypedetector.hxx>
#include <i18nutil/unicode.hxx>
#include <o3tl/safeint.hxx>
 
using namespace com::sun::star::i18n;
 
const sal_Int16 scriptDirection[] = {
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT = 0,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT = 1,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER = 2,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER_SEPARATOR = 3,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_EUROPEAN_NUMBER_TERMINATOR = 4,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_ARABIC_NUMBER = 5,
    ScriptDirection::NEUTRAL,           // DirectionProperty_COMMON_NUMBER_SEPARATOR = 6,
    ScriptDirection::NEUTRAL,           // DirectionProperty_BLOCK_SEPARATOR = 7,
    ScriptDirection::NEUTRAL,           // DirectionProperty_SEGMENT_SEPARATOR = 8,
    ScriptDirection::NEUTRAL,           // DirectionProperty_WHITE_SPACE_NEUTRAL = 9,
    ScriptDirection::NEUTRAL,           // DirectionProperty_OTHER_NEUTRAL = 10,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT_EMBEDDING = 11,
    ScriptDirection::LEFT_TO_RIGHT,     // DirectionProperty_LEFT_TO_RIGHT_OVERRIDE = 12,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_ARABIC = 13,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_EMBEDDING = 14,
    ScriptDirection::RIGHT_TO_LEFT,     // DirectionProperty_RIGHT_TO_LEFT_OVERRIDE = 15,
    ScriptDirection::NEUTRAL,           // DirectionProperty_POP_DIRECTIONAL_FORMAT = 16,
    ScriptDirection::NEUTRAL,           // DirectionProperty_DIR_NON_SPACING_MARK = 17,
    ScriptDirection::NEUTRAL,           // DirectionProperty_BOUNDARY_NEUTRAL = 18,
};
 
sal_Int16 ScriptTypeDetector::getScriptDirection( std::u16string_view Text, sal_Int32 nPos, sal_Int16 defaultScriptDirection )
{
    sal_Int16 dir = scriptDirection[unicode::getUnicodeDirection(Text[nPos])];
    return (dir == ScriptDirection::NEUTRAL) ? defaultScriptDirection : dir;
}
 
// return value '-1' means either the direction on nPos is not same as scriptDirection or nPos is out of range.
sal_Int32 ScriptTypeDetector::beginOfScriptDirection( std::u16string_view Text, sal_Int32 nPos, sal_Int16 direction )
{
        sal_Int32 cPos = nPos;
 
        if (cPos < static_cast<sal_Int32>(Text.size())) {
            for (; cPos >= 0; cPos--) {
                if (direction != getScriptDirection(Text, cPos, direction))
                    break;
            }
        }
        return cPos == nPos ? -1 : cPos + 1;
}
 
sal_Int32 ScriptTypeDetector::endOfScriptDirection( std::u16string_view Text, sal_Int32 nPos, sal_Int16 direction )
{
        sal_Int32 cPos = nPos;
        sal_Int32 len = Text.size();
 
        if (cPos >=0) {
            for (; cPos < len; cPos++) {
                if (direction != getScriptDirection(Text, cPos, direction))
                    break;
            }
        }
        return cPos == nPos ? -1 : cPos;
}
 
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