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// Copyright 2019 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_CSS_SYNTAX_STRING_PARSER_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_SYNTAX_STRING_PARSER_H_
#include "base/optional.h"
#include "third_party/blink/renderer/core/css/css_syntax_descriptor.h"
#include "third_party/blink/renderer/core/css/parser/css_tokenizer_input_stream.h"
#include "third_party/blink/renderer/platform/wtf/allocator.h"
namespace blink {
class CSSTokenizerInputStream;
// Produces a CSSSyntaxDescriptor from a CSSTokenizerInputStream.
//
// https://drafts.css-houdini.org/css-properties-values-api-1/#parsing-syntax
class CORE_EXPORT CSSSyntaxStringParser {
STACK_ALLOCATED();
public:
explicit CSSSyntaxStringParser(const String&);
// https://drafts.css-houdini.org/css-properties-values-api-1/#consume-syntax-descriptor
base::Optional<CSSSyntaxDescriptor> Parse();
private:
// https://drafts.css-houdini.org/css-properties-values-api-1/#consume-syntax-component
//
// Appends a CSSSyntaxComponent to the Vector on success.
bool ConsumeSyntaxComponent(Vector<CSSSyntaxComponent>&);
// https://drafts.css-houdini.org/css-properties-values-api-1/#consume-data-type-name
//
// Returns true if the input stream contained a supported data type name, i.e.
// a string with a corresponding CSSSyntaxType.
//
// https://drafts.css-houdini.org/css-properties-values-api-1/#supported-names
bool ConsumeDataTypeName(CSSSyntaxType&);
// Consumes a name from the input stream, and stores the result in 'ident'.
// Returns true if the value returned via 'ident' is not a css-wide keyword.
bool ConsumeIdent(String& ident);
// Consumes a '+' or '#' from the input stream (if present), and returns
// the appropriate CSSSyntaxRepeat. CSSSyntaxRepeat::kNone is returned if
// the next input code point is not '+' or '#'.
CSSSyntaxRepeat ConsumeRepeatIfPresent();
String string_;
CSSTokenizerInputStream input_;
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_CSS_CSS_SYNTAX_STRING_PARSER_H_
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