94 lines
3.7 KiB
C++
94 lines
3.7 KiB
C++
/*
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* CSS Media Query Evaluator
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*
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* Copyright (C) 2006 Kimmo Kinnunen <kimmo.t.kinnunen@nokia.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "MediaQueryExpression.h"
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#include <wtf/WeakPtr.h>
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namespace WebCore {
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class Document;
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class MediaQuerySet;
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class RenderStyle;
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struct MediaQueryResult {
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MediaQueryExpression expression;
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bool result;
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};
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struct MediaQueryDynamicResults {
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Vector<MediaQueryResult> viewport;
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Vector<MediaQueryResult> appearance;
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Vector<MediaQueryResult> accessibilitySettings;
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void append(const MediaQueryDynamicResults& other)
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{
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viewport.appendVector(other.viewport);
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appearance.appendVector(other.appearance);
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accessibilitySettings.appendVector(other.accessibilitySettings);
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}
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bool isEmpty() const { return viewport.isEmpty() && appearance.isEmpty() && accessibilitySettings.isEmpty(); }
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};
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// Some of the constructors are used for cases where the device characteristics are not known.
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// These can be used to prune the loading of stylesheets to only those which are not already known to not match.
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class MediaQueryEvaluator {
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public:
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// Creates evaluator which evaluates only simple media queries.
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// Evaluator returns true for "all", and returns value of \mediaFeatureResult for any media features.
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explicit MediaQueryEvaluator(bool mediaFeatureResult = false);
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// Creates evaluator which evaluates only simple media queries.
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// Evaluator returns true for acceptedMediaType and returns value of \mediaFeatureResult for any media features.
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MediaQueryEvaluator(const String& acceptedMediaType, bool mediaFeatureResult = false);
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// Creates evaluator which evaluates full media queries.
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WEBCORE_EXPORT MediaQueryEvaluator(const String& acceptedMediaType, const Document&, const RenderStyle*);
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bool mediaTypeMatch(const String& mediaTypeToMatch) const;
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bool mediaTypeMatchSpecific(const char* mediaTypeToMatch) const;
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// Evaluates media query subexpression, ie "and (media-feature: value)" part.
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bool evaluate(const MediaQueryExpression&) const;
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bool evaluateForChanges(const MediaQueryDynamicResults&) const;
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enum class Mode { Normal, AlwaysMatchDynamic };
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WEBCORE_EXPORT bool evaluate(const MediaQuerySet&, MediaQueryDynamicResults* = nullptr, Mode = Mode::Normal) const;
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static bool mediaAttributeMatches(Document&, const String& attributeValue);
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private:
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String m_mediaType;
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WeakPtr<const Document> m_document;
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const RenderStyle* m_style { nullptr };
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bool m_fallbackResult { false };
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};
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} // namespace
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