コード例 #1
0
bool VTTScanner::scanFloat(float& number)
{
    Run integerRun = collectWhile<isASCIIDigit>();
    seekTo(integerRun.end());
    Run decimalRun(getPosition(), getPosition(), m_is8Bit);
    if (scan('.')) {
        decimalRun = collectWhile<isASCIIDigit>();
        seekTo(decimalRun.end());
    }

    // At least one digit required.
    if (integerRun.isEmpty() && decimalRun.isEmpty()) {
        // Restore to starting position.
        seekTo(integerRun.start());
        return false;
    }

    size_t lengthOfFloat = Run(integerRun.start(), getPosition(), m_is8Bit).length();
    bool validNumber;
    if (m_is8Bit)
        number = charactersToFloat(integerRun.start(), lengthOfFloat, &validNumber);
    else
        number = charactersToFloat(reinterpret_cast<const UChar*>(integerRun.start()), lengthOfFloat, &validNumber);

    if (!validNumber)
        number = std::numeric_limits<float>::max();
    return true;
}
コード例 #2
0
ファイル: ViewportArguments.cpp プロジェクト: dzhshf/WebKit
static float numericPrefix(const String& keyString, const String& valueString, Document* document, bool* ok = 0)
{
    size_t parsedLength;
    float value;
    if (valueString.is8Bit())
        value = charactersToFloat(valueString.characters8(), valueString.length(), parsedLength);
    else
        value = charactersToFloat(valueString.characters16(), valueString.length(), parsedLength);
    if (!parsedLength) {
        reportViewportWarning(document, UnrecognizedViewportArgumentValueError, valueString, keyString);
        if (ok)
            *ok = false;
        return 0;
    }
    if (parsedLength < valueString.length())
        reportViewportWarning(document, TruncatedViewportArgumentValueError, valueString, keyString);
    if (ok)
        *ok = true;
    return value;
}
コード例 #3
0
 float toFloat(const CharType* attribute, bool& isValid)
 {
     // Make sure the is a valid floating point number
     // https://html.spec.whatwg.org/multipage/infrastructure.html#valid-floating-point-number
     unsigned lengthExcludingDescriptor = length - 1;
     if (lengthExcludingDescriptor > 0 && *(attribute + start) == '+') {
         isValid = false;
         return 0;
     }
     return charactersToFloat(attribute + start, lengthExcludingDescriptor, &isValid);
 }
コード例 #4
0
// See the specifications for more details about the algorithm to follow.
// http://www.w3.org/TR/2013/WD-html-srcset-20130228/#processing-the-image-candidates.
static void parseImagesWithScaleFromSrcsetAttribute(const String& srcsetAttribute, ImageCandidates& imageCandidates)
{
    ASSERT(imageCandidates.isEmpty());

    size_t imageCandidateStart = 0;
    unsigned srcsetAttributeLength = srcsetAttribute.length();

    while (imageCandidateStart < srcsetAttributeLength) {
        float imageScaleFactor = 1;
        size_t separator;

        // 4. Splitting loop: Skip whitespace.
        size_t imageURLStart = srcsetAttribute.find(isNotHTMLSpace, imageCandidateStart);
        if (imageURLStart == notFound)
            break;
        // If The current candidate is either totally empty or only contains space, skipping.
        if (srcsetAttribute[imageURLStart] == ',') {
            imageCandidateStart = imageURLStart + 1;
            continue;
        }
        // 5. Collect a sequence of characters that are not space characters, and let that be url.
        size_t imageURLEnd = srcsetAttribute.find(isHTMLSpace, imageURLStart + 1);
        if (imageURLEnd == notFound) {
            imageURLEnd = srcsetAttributeLength;
            separator = srcsetAttributeLength;
        } else if (srcsetAttribute[imageURLEnd - 1] == ',') {
            --imageURLEnd;
            separator = imageURLEnd;
        } else {
            // 7. Collect a sequence of characters that are not "," (U+002C) characters, and let that be descriptors.
            size_t imageScaleStart = srcsetAttribute.find(isNotHTMLSpace, imageURLEnd + 1);
            if (imageScaleStart == notFound)
                separator = srcsetAttributeLength;
            else if (srcsetAttribute[imageScaleStart] == ',')
                separator = imageScaleStart;
            else {
                // This part differs from the spec as the current implementation only supports pixel density descriptors for now.
                size_t imageScaleEnd = srcsetAttribute.find(isHTMLSpaceOrComma, imageScaleStart + 1);
                imageScaleEnd = (imageScaleEnd == notFound) ? srcsetAttributeLength : imageScaleEnd;
                size_t commaPosition = imageScaleEnd;
                // Make sure there are no other descriptors.
                while ((commaPosition < srcsetAttributeLength - 1) && isHTMLSpace(srcsetAttribute[commaPosition]))
                    ++commaPosition;
                // If the first not html space character after the scale modifier is not a comma,
                // the current candidate is an invalid input.
                if ((commaPosition < srcsetAttributeLength - 1) && srcsetAttribute[commaPosition] != ',') {
                    // Find the nearest comma and skip the input.
                    commaPosition = srcsetAttribute.find(',', commaPosition + 1);
                    if (commaPosition == notFound)
                        break;
                    imageCandidateStart = commaPosition + 1;
                    continue;
                }
                separator = commaPosition;
                if (srcsetAttribute[imageScaleEnd - 1] != 'x') {
                    imageCandidateStart = separator + 1;
                    continue;
                }
                bool validScaleFactor = false;
                size_t scaleFactorLengthWithoutUnit = imageScaleEnd - imageScaleStart - 1;
                imageScaleFactor = charactersToFloat(srcsetAttribute.characters() + imageScaleStart, scaleFactorLengthWithoutUnit, &validScaleFactor);

                if (!validScaleFactor) {
                    imageCandidateStart = separator + 1;
                    continue;
                }
            }
        }
        ImageWithScale image;
        image.imageURL = String(srcsetAttribute.characters() + imageURLStart, imageURLEnd - imageURLStart);
        image.scaleFactor = imageScaleFactor;

        imageCandidates.append(image);
        // 11. Return to the step labeled splitting loop.
        imageCandidateStart = separator + 1;
    }
}
コード例 #5
0
 float toFloat(const CharType* attribute, bool& isValid)
 {
     return charactersToFloat(attribute + start, length - 1, &isValid);
 }
コード例 #6
0
ファイル: StringImpl.cpp プロジェクト: freeworkzz/nook-st-oss
float StringImpl::toFloat(bool* ok)
{
    return charactersToFloat(m_data, m_length, ok);
}