PassOwnPtr<MediaQueryExp> MediaQueryExp::create(const AtomicString& mediaFeature, CSSParserValueList* valueList)
{
RefPtrWillBeRawPtr<CSSValue> cssValue;
bool isValid = false;
// Create value for media query expression that must have 1 or more values.
if (valueList) {
if (valueList->size() == 1) {
CSSParserValue* value = valueList->current();
if (featureWithCSSValueID(mediaFeature, value)) {
// Media features that use CSSValueIDs.
cssValue = CSSPrimitiveValue::createIdentifier(value->id);
if (!featureWithValidIdent(mediaFeature, toCSSPrimitiveValue(cssValue.get())->getValueID()))
cssValue.clear();
} else if (featureWithValidDensity(mediaFeature, value)) {
// Media features that must have non-negative <density>, ie. dppx, dpi or dpcm.
cssValue = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitTypes) value->unit);
} else if (featureWithValidPositiveLenghtOrNumber(mediaFeature, value)) {
// Media features that must have non-negative <lenght> or number value.
cssValue = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitTypes) value->unit);
} else if (featureWithPositiveInteger(mediaFeature, value)) {
// Media features that must have non-negative integer value.
cssValue = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
} else if (featureWithPositiveNumber(mediaFeature, value)) {
// Media features that must have non-negative number value.
cssValue = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
} else if (featureWithZeroOrOne(mediaFeature, value)) {
// Media features that must have (0|1) value.
cssValue = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
}
isValid = cssValue;
} else if (valueList->size() == 3 && featureWithAspectRatio(mediaFeature)) {
// Create list of values.
// Currently accepts only <integer>/<integer>.
// Applicable to device-aspect-ratio and aspec-ratio.
isValid = true;
float numeratorValue = 0;
float denominatorValue = 0;
// The aspect-ratio must be <integer> (whitespace)? / (whitespace)? <integer>.
for (unsigned i = 0; i < 3; ++i, valueList->next()) {
const CSSParserValue* value = valueList->current();
if (i != 1 && value->unit == CSSPrimitiveValue::CSS_NUMBER && value->fValue > 0 && value->isInt) {
if (!i)
numeratorValue = value->fValue;
else
denominatorValue = value->fValue;
} else if (i == 1 && value->unit == CSSParserValue::Operator && value->iValue == '/') {
continue;
} else {
isValid = false;
break;
}
}
if (isValid)
cssValue = CSSAspectRatioValue::create(numeratorValue, denominatorValue);
}
} else if (featureWithoutValue(mediaFeature)) {
isValid = true;
}
if (!isValid)
return nullptr;
return adoptPtr(new MediaQueryExp(mediaFeature, cssValue));
}
inline MediaQueryExp::MediaQueryExp(const AtomicString& mediaFeature, CSSParserValueList* valueList)
: m_mediaFeature(mediaFeature)
, m_value(0)
, m_isValid(false)
{
// Initialize media query expression that must have 1 or more values.
if (valueList) {
if (valueList->size() == 1) {
CSSParserValue* value = valueList->current();
// Media features that use CSSValueIDs.
if (featureWithCSSValueID(mediaFeature, value))
m_value = CSSPrimitiveValue::createIdentifier(value->id);
// Media features that must have non-negative <density>, ie. dppx, dpi or dpcm.
else if (featureWithValidDensity(mediaFeature, value))
m_value = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitTypes) value->unit);
// Media features that must have non-negative <lenght> or number value.
else if (featureWithValidPositiveLenghtOrNumber(mediaFeature, value))
m_value = CSSPrimitiveValue::create(value->fValue, (CSSPrimitiveValue::UnitTypes) value->unit);
// Media features that must have non-negative integer value.
else if (featureWithPositiveInteger(mediaFeature, value))
m_value = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
// Media features that must have non-negative number value.
else if (featureWithPositiveNumber(mediaFeature, value))
m_value = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
// Media features that must have (0|1) value.
else if (featureWithZeroOrOne(mediaFeature, value))
m_value = CSSPrimitiveValue::create(value->fValue, CSSPrimitiveValue::CSS_NUMBER);
m_isValid = m_value;
} else if (valueList->size() == 3 && featureWithAspectRatio(mediaFeature)) {
// Create list of values.
// Currently accepts only <integer>/<integer>.
// Applicable to device-aspect-ratio and aspec-ratio.
bool isValid = true;
float numeratorValue = 0;
float denominatorValue = 0;
// The aspect-ratio must be <integer> (whitespace)? / (whitespace)? <integer>.
for (unsigned i = 0; i < 3; ++i, valueList->next()) {
const CSSParserValue* value = valueList->current();
if (i != 1 && value->unit == CSSPrimitiveValue::CSS_NUMBER && value->fValue > 0 && value->isInt) {
if (!i)
numeratorValue = value->fValue;
else
denominatorValue = value->fValue;
} else if (i == 1 && value->unit == CSSParserValue::Operator && value->iValue == '/')
continue;
else {
isValid = false;
break;
}
}
if (isValid)
m_value = CSSAspectRatioValue::create(numeratorValue, denominatorValue);
m_isValid = m_value;
}
} else if (featureWithoutValue(mediaFeature))
m_isValid = true;
}