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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  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
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR 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.
+
+----------------------------------------------------------------------
+*/
+
+/** @file  FBXParser.h
+ *  @brief FBX parsing code
+ */
+#ifndef INCLUDED_AI_FBX_PARSER_H
+#define INCLUDED_AI_FBX_PARSER_H
+
+#include <stdint.h>
+#include <map>
+#include <memory>
+#include <vector>
+#include <assimp/LogAux.h>
+#include <assimp/fast_atof.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;
+
+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(const Token& key_token, Parser& parser);
+    ~Element();
+
+    const Scope* Compound() const {
+        return compound.get();
+    }
+
+    const Token& KeyToken() const {
+        return key_token;
+    }
+
+    const TokenList& Tokens() const {
+        return tokens;
+    }
+
+private:
+    const Token& key_token;
+    TokenList tokens;
+    std::unique_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();
+
+    const Element* operator[] (const std::string& index) const {
+        ElementMap::const_iterator it = elements.find(index);
+        return it == elements.end() ? nullptr : (*it).second;
+    }
+
+	const Element* FindElementCaseInsensitive(const std::string& elementName) const {
+		const char* elementNameCStr = elementName.c_str();
+		for (auto element = elements.begin(); element != elements.end(); ++element)
+		{
+			if (!ASSIMP_strincmp(element->first.c_str(), elementNameCStr, MAXLEN)) {
+				return element->second;
+			}
+		}
+        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 Scope& GetRootScope() const {
+        return *root.get();
+    }
+
+    bool IsBinary() const {
+        return is_binary;
+    }
+
+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;
+    std::unique_ptr<Scope> root;
+
+    const bool is_binary;
+};
+
+
+/* token parsing - this happens when building the DOM out of the parse-tree*/
+uint64_t ParseTokenAsID(const Token& t, const char*& err_out);
+size_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);
+int64_t ParseTokenAsInt64(const Token& t, const char*& err_out);
+std::string ParseTokenAsString(const Token& t, const char*& err_out);
+
+/* wrapper around ParseTokenAsXXX() with DOMError handling */
+uint64_t ParseTokenAsID(const Token& t);
+size_t ParseTokenAsDim(const Token& t);
+float ParseTokenAsFloat(const Token& t);
+int ParseTokenAsInt(const Token& t);
+int64_t ParseTokenAsInt64(const Token& t);
+std::string ParseTokenAsString(const Token& t);
+
+/* read data arrays */
+void ParseVectorDataArray(std::vector<aiVector3D>& out, const Element& el);
+void ParseVectorDataArray(std::vector<aiColor4D>& out, const Element& el);
+void ParseVectorDataArray(std::vector<aiVector2D>& out, const Element& el);
+void ParseVectorDataArray(std::vector<int>& out, const Element& el);
+void ParseVectorDataArray(std::vector<float>& out, const Element& el);
+void ParseVectorDataArray(std::vector<unsigned int>& out, const Element& el);
+void ParseVectorDataArray(std::vector<uint64_t>& out, const Element& e);
+void ParseVectorDataArray(std::vector<int64_t>& out, const Element& el);
+
+bool HasElement( const Scope& sc, const std::string& index );
+
+// extract a required element from a scope, abort if the element cannot be found
+const Element &GetRequiredElement(const Scope &sc, const std::string &index, const Element *element = nullptr);
+
+// extract required compound scope
+const Scope& GetRequiredScope(const Element& el);
+// get token at a particular index
+const Token& GetRequiredToken(const Element& el, unsigned int index);
+
+// read a 4x4 matrix from an array of 16 floats
+aiMatrix4x4 ReadMatrix(const Element& element);
+
+} // ! FBX
+} // ! Assimp
+
+#endif // ! INCLUDED_AI_FBX_PARSER_H