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/*
* Copyright (C) 2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "SourceSpan.h"
#include <wtf/text/StringParsingBuffer.h>
namespace WGSL {
enum class TokenType : uint32_t;
struct Token;
template<typename T>
class Lexer {
public:
Lexer(std::span<const T> code)
: m_code { code }
, m_current { m_code.hasCharactersRemaining() ? m_code[0] : T { } }
{
}
Vector<Token> lex();
bool isAtEndOfFile() const;
private:
Token nextToken();
Token lexNumber();
unsigned currentOffset() const { return m_currentPosition.offset; }
unsigned currentTokenLength() const { return currentOffset() - m_tokenStartingPosition.offset; }
Token makeToken(TokenType);
Token makeFloatToken(TokenType, double);
Token makeIntegerToken(TokenType, int64_t);
Token makeIdentifierToken(String&&);
T shift(unsigned = 1);
T peek(unsigned = 0);
void newLine();
bool skipBlockComments();
void skipLineComment();
bool skipWhitespaceAndComments();
StringParsingBuffer<T> m_code;
T m_current;
SourcePosition m_currentPosition { 1, 0, 0 };
SourcePosition m_tokenStartingPosition { 0, 0, 0 };
};
}
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