// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef COMPILER_PREPROCESSOR_TOKENIZER_H_
#define COMPILER_PREPROCESSOR_TOKENIZER_H_

#include "Input.h"
#include "Lexer.h"
#include "pp_utils.h"

#include <algorithm>

namespace pp
{

class Diagnostics;

class Tokenizer : public Lexer
{
public:
	struct Context
	{
		Diagnostics* diagnostics;

		Input input;
		// The location where yytext points to. Token location should track
		// scanLoc instead of Input::mReadLoc because they may not be the same
		// if text is buffered up in the scanner input buffer.
		Input::Location scanLoc;

		bool leadingSpace;
		bool lineStart;
	};
	static const size_t kMaxTokenLength;

	Tokenizer(Diagnostics* diagnostics);
	~Tokenizer();

	bool init(int count, const char* const string[], const int length[]);

	void setFileNumber(int file);
	void setLineNumber(int line);

	virtual void lex(Token* token);

private:
	PP_DISALLOW_COPY_AND_ASSIGN(Tokenizer);
	bool initScanner();
	void destroyScanner();

	void* mHandle;  // Scanner handle.
	Context mContext;  // Scanner extra.
};

}  // namespace pp
#endif  // COMPILER_PREPROCESSOR_TOKENIZER_H_