LocalizedNumberICU.cpp   [plain text]

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 * Copyright (C) 2011 Google Inc. All rights reserved.
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#include "config.h"
#include "LocalizedNumber.h"

#include <limits>
#include <unicode/numfmt.h>
#include <unicode/parsepos.h>
#include <wtf/MathExtras.h>
#include <wtf/PassOwnPtr.h>

using namespace icu;
using namespace std;

namespace WebCore {

static PassOwnPtr<NumberFormat> createFormatterForCurrentLocale()
{
    UErrorCode status = U_ZERO_ERROR;
    OwnPtr<NumberFormat> formatter = adoptPtr(NumberFormat::createInstance(status));
    return U_SUCCESS(status) ? formatter.release() : nullptr;
}

// This might return 0.
static NumberFormat* numberFormatter()
{
    ASSERT(isMainThread());
    static NumberFormat* formatter = createFormatterForCurrentLocale().leakPtr();
    return formatter;
}

double parseLocalizedNumber(const String& numberString)
{
    if (numberString.isEmpty())
        return numeric_limits<double>::quiet_NaN();
    NumberFormat* formatter = numberFormatter();
    if (!formatter)
        return numeric_limits<double>::quiet_NaN();
    UnicodeString numberUnicodeString(numberString.characters(), numberString.length());
    Formattable result;
    ParsePosition position(0);
    formatter->parse(numberUnicodeString, result, position);
    if (position.getIndex() != numberUnicodeString.length())
        return numeric_limits<double>::quiet_NaN();
    UErrorCode status = U_ZERO_ERROR;
    double numericResult = result.getDouble(status);
    return U_SUCCESS(status) ? numericResult : numeric_limits<double>::quiet_NaN();
}

String formatLocalizedNumber(double number, unsigned fractionDigits)
{
    NumberFormat* formatter = numberFormatter();
    if (!formatter)
        return String();
    UnicodeString result;
    formatter->setMaximumFractionDigits(clampToInteger(fractionDigits));
    formatter->format(number, result);
    return String(result.getBuffer(), result.length());
}

} // namespace WebCore