assimp/code/FBXParser.h

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

Copyright (c) 2006-2012, assimp team
All rights reserved.

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with or without modification, are permitted provided that the 
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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
  materials provided with the distribution.

* 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
  written permission of the assimp team.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file  FBXParser.h
 *  @brief FBX parsing code
 */
#ifndef INCLUDED_AI_FBX_PARSER_H
#define INCLUDED_AI_FBX_PARSER_H

#include <vector>
#include <map>
#include <string>

#include <boost/shared_ptr.hpp>

#include "LogAux.h"

#include "FBXCompileConfig.h"
#include "FBXTokenizer.h"

namespace Assimp {
namespace FBX {

	class Scope;
	class Parser;
	class Element;

	// XXX should use C++11's unique_ptr - but assimp's need to keep working with 03
	typedef std::vector< Scope* > ScopeList;
	typedef std::fbx_unordered_multimap< std::string, Element* > ElementMap;

#	define new_Scope new Scope
#	define new_Element new Element


/** FBX data entity that consists of a key:value tuple.
 *
 *  Example:
 *  @verbatim
 *    AnimationCurve: 23, "AnimCurve::", "" {
 *        [..]
 *    }
 *  @endverbatim
 *
 *  As can be seen in this sample, elements can contain nested #Scope
 *  as their trailing member.  **/
class Element
{
public:

	Element(TokenPtr key_token, Parser& parser);
	~Element();

public:

	const Scope* Compound() const {
		return compound.get();
	}

	TokenPtr KeyToken() const {
		return key_token;
	}

	const TokenList& Tokens() const {
		return tokens;
	}

private:

	TokenPtr key_token;
	TokenList tokens;
	boost::scoped_ptr<Scope> compound;
};



/** FBX data entity that consists of a 'scope', a collection
 *  of not necessarily unique #Element instances.
 *
 *  Example:
 *  @verbatim
 *    GlobalSettings:  {
 *        Version: 1000
 *        Properties70: 
 *        [...]
 *    }
 *  @endverbatim  */
class Scope
{

public:

	Scope(Parser& parser, bool topLevel = false);
	~Scope();

public:

	const Element* operator[] (const std::string& index) const {
		ElementMap::const_iterator it = elements.find(index);
		return it == elements.end() ? NULL : (*it).second;
	}

	const ElementMap& Elements() const	{
		return elements;
	}

private:

	ElementMap elements;
};


/** FBX parsing class, takes a list of input tokens and generates a hierarchy
 *  of nested #Scope instances, representing the fbx DOM.*/
class Parser 
{
public:
	
	/** Parse given a token list. Does not take ownership of the tokens -
	 *  the objects must persist during the entire parser lifetime */
	Parser (const TokenList& tokens);
	~Parser();

public:

	const Scope& GetRootScope() const {
		return *root.get();
	}

private:

	friend class Scope;
	friend class Element;

	TokenPtr AdvanceToNextToken();

	TokenPtr LastToken() const;
	TokenPtr CurrentToken() const;

private:

	const TokenList& tokens;
	
	TokenPtr last, current;
	TokenList::const_iterator cursor;
	boost::scoped_ptr<Scope> root;
};


/* token parsing - this happens when building the DOM out of the parse-tree*/
uint64_t ParseTokenAsID(const Token& t, const char*& err_out);
uint64_t ParseTokenAsDim(const Token& t, const char*& err_out);

float ParseTokenAsFloat(const Token& t, const char*& err_out);
int ParseTokenAsInt(const Token& t, const char*& err_out);
std::string ParseTokenAsString(const Token& t, const char*& err_out);

} // ! FBX
} // ! Assimp

#endif // ! INCLUDED_AI_FBX_PARSER_H