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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/css/properties/CSSPropertyAPIClip.h"
#include "core/css/CSSQuadValue.h"
#include "core/css/parser/CSSParserContext.h"
#include "core/css/parser/CSSPropertyParserHelpers.h"
namespace blink {
namespace {
CSSValue* consumeClipComponent(CSSParserTokenRange& range,
CSSParserMode cssParserMode) {
if (range.peek().id() == CSSValueAuto)
return CSSPropertyParserHelpers::consumeIdent(range);
return CSSPropertyParserHelpers::consumeLength(
range, cssParserMode, ValueRangeAll,
CSSPropertyParserHelpers::UnitlessQuirk::Allow);
}
} // namespace
const CSSValue* CSSPropertyAPIClip::parseSingleValue(
CSSParserTokenRange& range,
const CSSParserContext* context) {
if (range.peek().id() == CSSValueAuto)
return CSSPropertyParserHelpers::consumeIdent(range);
if (range.peek().functionId() != CSSValueRect)
return nullptr;
CSSParserTokenRange args = CSSPropertyParserHelpers::consumeFunction(range);
// rect(t, r, b, l) || rect(t r b l)
CSSValue* top = consumeClipComponent(args, context->mode());
if (!top)
return nullptr;
bool needsComma =
CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(args);
CSSValue* right = consumeClipComponent(args, context->mode());
if (!right ||
(needsComma &&
!CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(args)))
return nullptr;
CSSValue* bottom = consumeClipComponent(args, context->mode());
if (!bottom ||
(needsComma &&
!CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(args)))
return nullptr;
CSSValue* left = consumeClipComponent(args, context->mode());
if (!left || !args.atEnd())
return nullptr;
return CSSQuadValue::create(top, right, bottom, left,
CSSQuadValue::SerializeAsRect);
}
} // namespace blink
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