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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 THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PARSER_FONT_VARIANT_LIGATURES_PARSER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PARSER_FONT_VARIANT_LIGATURES_PARSER_H_
#include "third_party/blink/renderer/core/css/css_identifier_value.h"
#include "third_party/blink/renderer/core/css/css_value_list.h"
#include "third_party/blink/renderer/core/css/parser/css_parser_token_range.h"
#include "third_party/blink/renderer/core/css/parser/css_property_parser_helpers.h"
namespace blink {
class FontVariantLigaturesParser {
STACK_ALLOCATED();
public:
FontVariantLigaturesParser()
: saw_common_ligatures_value_(false),
saw_discretionary_ligatures_value_(false),
saw_historical_ligatures_value_(false),
saw_contextual_ligatures_value_(false),
result_(CSSValueList::CreateSpaceSeparated()) {}
enum class ParseResult { kConsumedValue, kDisallowedValue, kUnknownValue };
ParseResult ConsumeLigature(CSSParserTokenRange& range) {
CSSValueID value_id = range.Peek().Id();
switch (value_id) {
case CSSValueNoCommonLigatures:
case CSSValueCommonLigatures:
if (saw_common_ligatures_value_)
return ParseResult::kDisallowedValue;
saw_common_ligatures_value_ = true;
break;
case CSSValueNoDiscretionaryLigatures:
case CSSValueDiscretionaryLigatures:
if (saw_discretionary_ligatures_value_)
return ParseResult::kDisallowedValue;
saw_discretionary_ligatures_value_ = true;
break;
case CSSValueNoHistoricalLigatures:
case CSSValueHistoricalLigatures:
if (saw_historical_ligatures_value_)
return ParseResult::kDisallowedValue;
saw_historical_ligatures_value_ = true;
break;
case CSSValueNoContextual:
case CSSValueContextual:
if (saw_contextual_ligatures_value_)
return ParseResult::kDisallowedValue;
saw_contextual_ligatures_value_ = true;
break;
default:
return ParseResult::kUnknownValue;
}
result_->Append(*css_property_parser_helpers::ConsumeIdent(range));
return ParseResult::kConsumedValue;
}
CSSValue* FinalizeValue() {
if (!result_->length())
return CSSIdentifierValue::Create(CSSValueNormal);
return result_.Release();
}
private:
bool saw_common_ligatures_value_;
bool saw_discretionary_ligatures_value_;
bool saw_historical_ligatures_value_;
bool saw_contextual_ligatures_value_;
Member<CSSValueList> result_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_PARSER_FONT_VARIANT_LIGATURES_PARSER_H_