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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.
#ifndef FontVariantLigaturesParser_h
#define FontVariantLigaturesParser_h
#include "core/css/CSSIdentifierValue.h"
#include "core/css/CSSValueList.h"
#include "core/css/parser/CSSParserTokenRange.h"
#include "core/css/parser/CSSPropertyParserHelpers.h"
namespace blink {
class FontVariantLigaturesParser {
STACK_ALLOCATED();
public:
FontVariantLigaturesParser()
: m_sawCommonLigaturesValue(false),
m_sawDiscretionaryLigaturesValue(false),
m_sawHistoricalLigaturesValue(false),
m_sawContextualLigaturesValue(false),
m_result(CSSValueList::createSpaceSeparated()) {}
enum class ParseResult { ConsumedValue, DisallowedValue, UnknownValue };
ParseResult consumeLigature(CSSParserTokenRange& range) {
CSSValueID valueID = range.peek().id();
switch (valueID) {
case CSSValueNoCommonLigatures:
case CSSValueCommonLigatures:
if (m_sawCommonLigaturesValue)
return ParseResult::DisallowedValue;
m_sawCommonLigaturesValue = true;
break;
case CSSValueNoDiscretionaryLigatures:
case CSSValueDiscretionaryLigatures:
if (m_sawDiscretionaryLigaturesValue)
return ParseResult::DisallowedValue;
m_sawDiscretionaryLigaturesValue = true;
break;
case CSSValueNoHistoricalLigatures:
case CSSValueHistoricalLigatures:
if (m_sawHistoricalLigaturesValue)
return ParseResult::DisallowedValue;
m_sawHistoricalLigaturesValue = true;
break;
case CSSValueNoContextual:
case CSSValueContextual:
if (m_sawContextualLigaturesValue)
return ParseResult::DisallowedValue;
m_sawContextualLigaturesValue = true;
break;
default:
return ParseResult::UnknownValue;
}
m_result->append(*CSSPropertyParserHelpers::consumeIdent(range));
return ParseResult::ConsumedValue;
}
CSSValue* finalizeValue() {
if (!m_result->length())
return CSSIdentifierValue::create(CSSValueNormal);
return m_result.release();
}
private:
bool m_sawCommonLigaturesValue;
bool m_sawDiscretionaryLigaturesValue;
bool m_sawHistoricalLigaturesValue;
bool m_sawContextualLigaturesValue;
Member<CSSValueList> m_result;
};
} // namespace blink
#endif // FontVariantLigaturesParser_h
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