virtualx-engine/modules/fbx/fbx_parser/FBXParser.h

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

#include <stdint.h>
#include <map>
#include <memory>

#include "core/color.h"
#include "core/math/transform.h"
#include "core/math/vector2.h"
#include "core/math/vector3.h"

#include "FBXTokenizer.h"

namespace FBXDocParser {

class Scope;
class Parser;
class Element;

typedef Element *ElementPtr;
typedef Scope *ScopePtr;

typedef std::vector<ScopePtr> ScopeList;
typedef std::multimap<std::string, ElementPtr> ElementMap;
typedef std::pair<ElementMap::const_iterator, ElementMap::const_iterator> ElementCollection;

#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();

	ScopePtr Compound() const {
		return compound;
	}

	TokenPtr KeyToken() const {
		return key_token;
	}

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

private:
	TokenList tokens;
	ScopePtr compound = nullptr;
	std::vector<ScopePtr> compound_scope;
	TokenPtr key_token = nullptr;
};

/** 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();

	ElementPtr GetElement(const std::string &index) const {
		ElementMap::const_iterator it = elements.find(index);
		return it == elements.end() ? nullptr : (*it).second;
	}

	ElementPtr FindElementCaseInsensitive(const std::string &elementName) const {
		for (auto element = elements.begin(); element != elements.end(); ++element) {
			if (element->first.compare(elementName)) {
				return element->second;
			}
		}

		// nothing to reference / expired.
		return nullptr;
	}

	ElementCollection GetCollection(const std::string &index) const {
		return elements.equal_range(index);
	}

	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, bool is_binary);
	~Parser();

	const ScopePtr GetRootScope() const {
		return root;
	}

	bool IsBinary() const {
		return is_binary;
	}

private:
	friend class Scope;
	friend class Element;

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

private:
	ScopeList scopes;
	const TokenList &tokens;

	TokenPtr last = nullptr, current = nullptr;
	TokenList::const_iterator cursor;
	ScopePtr root = nullptr;

	const bool is_binary;
};

/* token parsing - this happens when building the DOM out of the parse-tree*/
uint64_t ParseTokenAsID(const TokenPtr t, const char *&err_out);
size_t ParseTokenAsDim(const TokenPtr t, const char *&err_out);
float ParseTokenAsFloat(const TokenPtr t, const char *&err_out);
int ParseTokenAsInt(const TokenPtr t, const char *&err_out);
int64_t ParseTokenAsInt64(const TokenPtr t, const char *&err_out);
std::string ParseTokenAsString(const TokenPtr t, const char *&err_out);

/* wrapper around ParseTokenAsXXX() with DOMError handling */
uint64_t ParseTokenAsID(const TokenPtr t);
size_t ParseTokenAsDim(const TokenPtr t);
float ParseTokenAsFloat(const TokenPtr t);
int ParseTokenAsInt(const TokenPtr t);
int64_t ParseTokenAsInt64(const TokenPtr t);
std::string ParseTokenAsString(const TokenPtr t);

/* read data arrays */
void ParseVectorDataArray(std::vector<Vector3> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<Color> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<Vector2> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<int> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<float> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<float> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<unsigned int> &out, const ElementPtr el);
void ParseVectorDataArray(std::vector<uint64_t> &out, const ElementPtr ep);
void ParseVectorDataArray(std::vector<int64_t> &out, const ElementPtr el);
bool HasElement(const ScopePtr sc, const std::string &index);

// extract a required element from a scope, abort if the element cannot be found
const ElementPtr GetRequiredElement(const ScopePtr sc, const std::string &index, const ElementPtr element = nullptr);
const ScopePtr GetRequiredScope(const ElementPtr el); // New in 2020. (less likely to destroy application)
const ElementPtr GetOptionalElement(const ScopePtr sc, const std::string &index, const ElementPtr element = nullptr);
// extract required compound scope
const ScopePtr GetRequiredScope(const ElementPtr el);
// get token at a particular index
TokenPtr GetRequiredToken(const ElementPtr el, unsigned int index);

// ------------------------------------------------------------------------------------------------
// read a 4x4 matrix from an array of 16 floats
Transform ReadMatrix(const ElementPtr element);

} // namespace FBXDocParser

#endif // FBX_PARSER_H