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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_LONGHAND_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_LONGHAND_H_
#include "base/notreached.h"
#include "third_party/blink/renderer/core/css/css_initial_value.h"
#include "third_party/blink/renderer/core/css/parser/css_tokenizer.h"
#include "third_party/blink/renderer/core/css/properties/css_property.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_state.h"
#include "third_party/blink/renderer/platform/graphics/color.h"
#include "third_party/blink/renderer/platform/wtf/casting.h"
namespace blink {
class CSSValue;
class CSSParserContext;
class CSSParserLocalContext;
class CSSParserTokenStream;
class Longhand : public CSSProperty {
public:
// Parses and consumes a longhand property value from the token stream.
// Returns nullptr if the input is invalid.
//
// NOTE: This function must accept arbitrary tokens after the value,
// without returning error. In particular, it must not check for
// end-of-stream, since it may be called as part of parsing a shorthand, or
// there may be “!important” after the value that the caller is responsible
// the caller is responsible for consuming. End-of-stream is checked
// by the caller (after potentially consuming “!important”).
CORE_EXPORT
virtual const CSSValue* ParseSingleValue(
CSSParserTokenStream& stream,
const CSSParserContext& context,
const CSSParserLocalContext& local_tokenizer) const {
return nullptr;
}
virtual void ApplyInitial(StyleResolverState&) const { NOTREACHED(); }
virtual void ApplyInherit(StyleResolverState&) const { NOTREACHED(); }
virtual void ApplyValue(StyleResolverState&,
const CSSValue&,
ValueMode) const {
NOTREACHED();
}
void ApplyUnset(StyleResolverState& state) const {
if (state.IsInheritedForUnset(*this)) {
ApplyInherit(state);
} else {
ApplyInitial(state);
}
}
virtual const blink::Color ColorIncludingFallback(
bool,
const ComputedStyle&,
bool* is_current_color = nullptr) const {
NOTREACHED();
}
virtual const CSSValue* InitialValue() const {
return CSSInitialValue::Create();
}
[[nodiscard]] virtual bool IsAffectedByCurrentColor(
const ComputedStyle& style) const {
NOTREACHED();
}
protected:
constexpr Longhand(CSSPropertyID id, Flags flags, char repetition_separator)
: CSSProperty(id, flags | kLonghand, repetition_separator) {}
// Applies the computed CSSValue of the parent style using ApplyValue.
// This generally achieves the same as ApplyInherit, but effectively
// "rezooms" the value.
//
// https://github.com/w3c/csswg-drafts/issues/9397
void ApplyParentValue(StyleResolverState&) const;
// If our zoom is different from the parent zoom, calls ApplyParentValue
// and returns true. Otherwise does nothing and returns false.
bool ApplyParentValueIfZoomChanged(StyleResolverState&) const;
};
template <>
struct DowncastTraits<Longhand> {
static bool AllowFrom(const CSSProperty& longhand) {
return longhand.IsLonghand();
}
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PROPERTIES_LONGHAND_H_
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