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/*
* CSS Media Query Evaluator
*
* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
*
* 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 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.
*/
#pragma once
#include "IntSize.h"
#include "MediaQueryExpression.h"
#include <wtf/WeakPtr.h>
namespace WebCore {
class Document;
class MediaQuerySet;
class RenderStyle;
struct MediaQueryResult {
MediaQueryExpression expression;
bool result;
};
struct MediaQueryDynamicResults {
Vector<MediaQueryResult> viewport;
Vector<MediaQueryResult> appearance;
Vector<MediaQueryResult> accessibilitySettings;
void append(const MediaQueryDynamicResults& other)
{
viewport.appendVector(other.viewport);
appearance.appendVector(other.appearance);
accessibilitySettings.appendVector(other.accessibilitySettings);
}
bool isEmpty() const { return viewport.isEmpty() && appearance.isEmpty() && accessibilitySettings.isEmpty(); }
};
using MediaQueryViewportState = std::tuple<IntSize, float, bool>;
MediaQueryViewportState mediaQueryViewportStateForDocument(const Document&);
// Some of the constructors are used for cases where the device characteristics are not known.
// These can be used to prune the loading of stylesheets to only those which are not already known to not match.
class MediaQueryEvaluator {
public:
// Creates evaluator which evaluates only simple media queries.
// Evaluator returns true for "all", and returns value of \mediaFeatureResult for any media features.
explicit MediaQueryEvaluator(bool mediaFeatureResult = false);
// Creates evaluator which evaluates only simple media queries.
// Evaluator returns true for acceptedMediaType and returns value of \mediaFeatureResult for any media features.
MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult = false);
// Creates evaluator which evaluates full media queries.
WEBCORE_EXPORT MediaQueryEvaluator(const String& acceptedMediaType, const Document&, const RenderStyle*);
bool mediaTypeMatch(const String& mediaTypeToMatch) const;
bool mediaTypeMatchSpecific(ASCIILiteral mediaTypeToMatch) const;
// Evaluates media query subexpression, ie "and (media-feature: value)" part.
bool evaluate(const MediaQueryExpression&) const;
bool evaluateForChanges(const MediaQueryDynamicResults&) const;
enum class Mode { Normal, AlwaysMatchDynamic };
WEBCORE_EXPORT bool evaluate(const MediaQuerySet&, MediaQueryDynamicResults* = nullptr, Mode = Mode::Normal) const;
static bool mediaAttributeMatches(Document&, const String& attributeValue);
private:
String m_mediaType;
WeakPtr<const Document> m_document;
const RenderStyle* m_style { nullptr };
bool m_fallbackResult { false };
};
} // namespace
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