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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/CSSPropertyAPIFontVariationSettings.h"
#include "core/css/CSSFontVariationValue.h"
#include "core/css/CSSValueList.h"
#include "core/css/parser/CSSParserContext.h"
#include "core/css/parser/CSSPropertyParserHelpers.h"
#include "platform/RuntimeEnabledFeatures.h"
namespace blink {
namespace {
CSSFontVariationValue* consumeFontVariationTag(CSSParserTokenRange& range) {
// Feature tag name consists of 4-letter characters.
static const unsigned tagNameLength = 4;
const CSSParserToken& token = range.consumeIncludingWhitespace();
// Feature tag name comes first
if (token.type() != StringToken)
return nullptr;
if (token.value().length() != tagNameLength)
return nullptr;
AtomicString tag = token.value().toAtomicString();
for (unsigned i = 0; i < tagNameLength; ++i) {
// Limits the range of characters to 0x20-0x7E, following the tag name rules
// defined in the OpenType specification.
UChar character = tag[i];
if (character < 0x20 || character > 0x7E)
return nullptr;
}
double tagValue = 0;
if (!CSSPropertyParserHelpers::consumeNumberRaw(range, tagValue))
return nullptr;
return CSSFontVariationValue::create(tag, clampTo<float>(tagValue));
}
} // namespace
const CSSValue* CSSPropertyAPIFontVariationSettings::parseSingleValue(
CSSParserTokenRange& range,
const CSSParserContext* context) {
DCHECK(RuntimeEnabledFeatures::cssVariableFontsEnabled());
if (range.peek().id() == CSSValueNormal)
return CSSPropertyParserHelpers::consumeIdent(range);
CSSValueList* variationSettings = CSSValueList::createCommaSeparated();
do {
CSSFontVariationValue* fontVariationValue = consumeFontVariationTag(range);
if (!fontVariationValue)
return nullptr;
variationSettings->append(*fontVariationValue);
} while (CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(range));
return variationSettings;
}
} // namespace blink
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