| /* |
| * CSS Media Query |
| * |
| * Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>. |
| * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). |
| * Copyright (C) 2013 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "MediaQueryExp.h" |
| |
| #include "CSSAspectRatioValue.h" |
| #include "CSSParser.h" |
| #include "CSSPrimitiveValue.h" |
| #include "CSSValueList.h" |
| #include <wtf/text/StringBuilder.h> |
| |
| namespace WebCore { |
| |
| static inline bool featureWithCSSValueID(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if (!value->id) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::orientationMediaFeature |
| #if ENABLE(VIEW_MODE_CSS_MEDIA) |
| || mediaFeature == MediaFeatureNames::view_modeMediaFeature |
| #endif // ENABLE(VIEW_MODE_CSS_MEDIA) |
| || mediaFeature == MediaFeatureNames::pointerMediaFeature; |
| } |
| |
| static inline bool featureWithValidPositiveLenghtOrNumber(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if (!(((value->unit >= CSSPrimitiveValue::CSS_EMS && value->unit <= CSSPrimitiveValue::CSS_PC) || value->unit == CSSPrimitiveValue::CSS_REMS) || value->unit == CSSPrimitiveValue::CSS_NUMBER) || value->fValue < 0) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::heightMediaFeature |
| || mediaFeature == MediaFeatureNames::max_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::min_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::widthMediaFeature |
| || mediaFeature == MediaFeatureNames::max_widthMediaFeature |
| || mediaFeature == MediaFeatureNames::min_widthMediaFeature |
| || mediaFeature == MediaFeatureNames::device_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::max_device_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::min_device_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::device_widthMediaFeature |
| || mediaFeature == MediaFeatureNames::max_device_widthMediaFeature |
| || mediaFeature == MediaFeatureNames::min_device_widthMediaFeature; |
| } |
| |
| static inline bool featureWithValidDensity(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if ((value->unit != CSSPrimitiveValue::CSS_DPPX && value->unit != CSSPrimitiveValue::CSS_DPI && value->unit != CSSPrimitiveValue::CSS_DPCM) || value->fValue <= 0) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::resolutionMediaFeature |
| || mediaFeature == MediaFeatureNames::max_resolutionMediaFeature |
| || mediaFeature == MediaFeatureNames::min_resolutionMediaFeature; |
| } |
| |
| static inline bool featureWithPositiveInteger(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if (!value->isInt || value->fValue < 0) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::colorMediaFeature |
| || mediaFeature == MediaFeatureNames::max_colorMediaFeature |
| || mediaFeature == MediaFeatureNames::min_colorMediaFeature |
| || mediaFeature == MediaFeatureNames::color_indexMediaFeature |
| || mediaFeature == MediaFeatureNames::max_color_indexMediaFeature |
| || mediaFeature == MediaFeatureNames::min_color_indexMediaFeature |
| || mediaFeature == MediaFeatureNames::min_monochromeMediaFeature |
| || mediaFeature == MediaFeatureNames::max_monochromeMediaFeature; |
| } |
| |
| static inline bool featureWithPositiveNumber(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if (value->unit != CSSPrimitiveValue::CSS_NUMBER || value->fValue < 0) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::transform_2dMediaFeature |
| || mediaFeature == MediaFeatureNames::transform_3dMediaFeature |
| || mediaFeature == MediaFeatureNames::transitionMediaFeature |
| || mediaFeature == MediaFeatureNames::animationMediaFeature |
| || mediaFeature == MediaFeatureNames::device_pixel_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::max_device_pixel_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::min_device_pixel_ratioMediaFeature; |
| } |
| |
| static inline bool featureWithZeroOrOne(const AtomicString& mediaFeature, const CSSParserValue* value) |
| { |
| if (!value->isInt || !(value->fValue == 1 || !value->fValue)) |
| return false; |
| |
| return mediaFeature == MediaFeatureNames::gridMediaFeature |
| || mediaFeature == MediaFeatureNames::hoverMediaFeature; |
| } |
| |
| static inline bool featureWithAspectRatio(const AtomicString& mediaFeature) |
| { |
| return mediaFeature == MediaFeatureNames::aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::device_aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::min_aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::max_aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::min_device_aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::max_device_aspect_ratioMediaFeature; |
| } |
| |
| static inline bool featureWithoutValue(const AtomicString& mediaFeature) |
| { |
| // Media features that are prefixed by min/max cannot be used without a value. |
| return mediaFeature == MediaFeatureNames::monochromeMediaFeature |
| || mediaFeature == MediaFeatureNames::colorMediaFeature |
| || mediaFeature == MediaFeatureNames::color_indexMediaFeature |
| || mediaFeature == MediaFeatureNames::gridMediaFeature |
| || mediaFeature == MediaFeatureNames::heightMediaFeature |
| || mediaFeature == MediaFeatureNames::widthMediaFeature |
| || mediaFeature == MediaFeatureNames::device_heightMediaFeature |
| || mediaFeature == MediaFeatureNames::device_widthMediaFeature |
| || mediaFeature == MediaFeatureNames::orientationMediaFeature |
| || mediaFeature == MediaFeatureNames::aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::device_aspect_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::hoverMediaFeature |
| || mediaFeature == MediaFeatureNames::transform_2dMediaFeature |
| || mediaFeature == MediaFeatureNames::transform_3dMediaFeature |
| || mediaFeature == MediaFeatureNames::transitionMediaFeature |
| || mediaFeature == MediaFeatureNames::animationMediaFeature |
| #if ENABLE(VIEW_MODE_CSS_MEDIA) |
| || mediaFeature == MediaFeatureNames::view_modeMediaFeature |
| #endif // ENABLE(VIEW_MODE_CSS_MEDIA) |
| || mediaFeature == MediaFeatureNames::pointerMediaFeature |
| || mediaFeature == MediaFeatureNames::device_pixel_ratioMediaFeature |
| || mediaFeature == MediaFeatureNames::resolutionMediaFeature; |
| } |
| |
| 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; |
| } |
| |
| PassOwnPtr<MediaQueryExp> MediaQueryExp::create(const AtomicString& mediaFeature, CSSParserValueList* values) |
| { |
| return adoptPtr(new MediaQueryExp(mediaFeature, values)); |
| } |
| |
| MediaQueryExp::~MediaQueryExp() |
| { |
| } |
| |
| String MediaQueryExp::serialize() const |
| { |
| if (!m_serializationCache.isNull()) |
| return m_serializationCache; |
| |
| StringBuilder result; |
| result.append('('); |
| result.append(m_mediaFeature.lower()); |
| if (m_value) { |
| result.appendLiteral(": "); |
| result.append(m_value->cssText()); |
| } |
| result.append(')'); |
| |
| const_cast<MediaQueryExp*>(this)->m_serializationCache = result.toString(); |
| return m_serializationCache; |
| } |
| |
| } // namespace |
