assimp/code/FBXTokenizer.h

/*
Open Asset Import Library (assimp)
----------------------------------------------------------------------

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All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
  copyright notice, this list of conditions and the
  following disclaimer in the documentation and/or other
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* Neither the name of the assimp team, nor the names of its
  contributors may be used to endorse or promote products
  derived from this software without specific prior
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*/

/** @file  FBXTokenizer.h
 *  @brief FBX lexer
 */
#ifndef INCLUDED_AI_FBX_TOKENIZER_H
#define INCLUDED_AI_FBX_TOKENIZER_H

#include <boost/shared_ptr.hpp>
#include "FBXCompileConfig.h"
#include "../include/assimp/ai_assert.h"
#include <vector>
#include <string>

namespace Assimp {
namespace FBX {

/** Rough classification for text FBX tokens used for constructing the
 *  basic scope hierarchy. */
enum TokenType
{
	// {
	TokenType_OPEN_BRACKET = 0,
	
	// }
	TokenType_CLOSE_BRACKET,

	// '"blablubb"', '2', '*14' - very general token class,
	// further processing happens at a later stage.
	TokenType_DATA,

	//
	TokenType_BINARY_DATA,

	// ,
	TokenType_COMMA,

	// blubb:
	TokenType_KEY
};


/** Represents a single token in a FBX file. Tokens are
 *  classified by the #TokenType enumerated types.
 *
 *  Offers iterator protocol. Tokens are immutable. */
class Token 
{

private:

	static const unsigned int BINARY_MARKER = static_cast<unsigned int>(-1);

public:

	/** construct a textual token */
	Token(const char* sbegin, const char* send, TokenType type, unsigned int line, unsigned int column);

	/** construct a binary token */
	Token(const char* sbegin, const char* send, TokenType type, unsigned int offset);

	~Token();

public:

	std::string StringContents() const {
		return std::string(begin(),end());
	}

public:

	bool IsBinary() const {
		return column == BINARY_MARKER;
	}

	const char* begin() const {
		return sbegin;
	}

	const char* end() const {
		return send;
	}

	TokenType Type() const {
		return type;
	}

	unsigned int Offset() const {
		ai_assert(IsBinary());
		return offset;
	}

	unsigned int Line() const {
		ai_assert(!IsBinary());
		return line;
	}

	unsigned int Column() const {
		ai_assert(!IsBinary());
		return column;
	}

private:

#ifdef DEBUG
	// full string copy for the sole purpose that it nicely appears
	// in msvc's debugger window.
	const std::string contents;
#endif


	const char* const sbegin;
	const char* const send;
	const TokenType type;

	union {
		const unsigned int line;
		unsigned int offset;
	};
	const unsigned int column;
};

// XXX should use C++11's unique_ptr - but assimp's need to keep working with 03
typedef const Token* TokenPtr;
typedef std::vector< TokenPtr > TokenList;

#define new_Token new Token


/** Main FBX tokenizer function. Transform input buffer into a list of preprocessed tokens.
 *
 *  Skips over comments and generates line and column numbers.
 *
 * @param output_tokens Receives a list of all tokens in the input data.
 * @param input_buffer Textual input buffer to be processed, 0-terminated.
 * @throw DeadlyImportError if something goes wrong */
void Tokenize(TokenList& output_tokens, const char* input);


/** Tokenizer function for binary FBX files.
 *
 *  Emits a token list suitable for direct parsing.
 *
 * @param output_tokens Receives a list of all tokens in the input data.
 * @param input_buffer Binary input buffer to be processed.
 * @param length Length of input buffer, in bytes. There is no 0-terminal.
 * @throw DeadlyImportError if something goes wrong */
void TokenizeBinary(TokenList& output_tokens, const char* input, unsigned int length);


} // ! FBX
} // ! Assimp

#endif // ! INCLUDED_AI_FBX_PARSER_H