+ add first prototype version of the IFC-STEP loader. Loads many test models fine but does not support some of the more sophisticated format features.

git-svn-id: https://assimp.svn.sourceforge.net/svnroot/assimp/trunk@979 67173fc5-114c-0410-ac8e-9d2fd5bffc1f

code/CMakeLists.txt

@@ -314,6 +314,16 @@ SOURCE_GROUP(BLENDER FILES
 	BlenderModifier.cpp
 )
 
+SOURCE_GROUP(IFC FILES
+	IFCLoader.cpp
+	IFCLoader.h
+	IFCReaderGen.cpp
+	IFCReaderGen.h
+	STEPFile.h
+	STEPFileReader.h
+	STEPFileReader.cpp
+)
+
 SOURCE_GROUP( PostProcessing FILES
 	CalcTangentsProcess.cpp
 	CalcTangentsProcess.h
@@ -742,6 +752,13 @@ ADD_LIBRARY( assimp SHARED
 	DeboneProcess.h
 	ColladaExporter.h
 	ColladaExporter.cpp
+	IFCLoader.cpp
+	IFCLoader.h
+	IFCReaderGen.cpp
+	IFCReaderGen.h
+	STEPFile.h
+	STEPFileReader.h
+	STEPFileReader.cpp
 
 	# Necessary to show the headers in the project when using the VC++ generator:
 	BoostWorkaround/boost/math/common_factor_rt.hpp

code/IFCLoader.h

@@ -0,0 +1,141 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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  IFC.h
+ *  @brief Declaration of the Industry Foundation Classes (IFC) loader main class
+ */
+#ifndef INCLUDED_AI_IFC_LOADER_H
+#define INCLUDED_AI_IFC_LOADER_H
+
+#include "BaseImporter.h"
+namespace Assimp	{
+	
+	// TinyFormatter.h
+	namespace Formatter {
+		template <typename T,typename TR, typename A> class basic_formatter;
+		typedef class basic_formatter< char, std::char_traits<char>, std::allocator<char> > format;
+	}
+
+	namespace STEP {
+		class DB;
+	}
+
+
+// -------------------------------------------------------------------------------------------
+/** Load the IFC format, which is an open specification to describe building and construction
+    industry data.
+
+ See http://en.wikipedia.org/wiki/Industry_Foundation_Classes
+*/
+// -------------------------------------------------------------------------------------------
+class IFCImporter : public BaseImporter
+{
+	friend class Importer;
+
+protected:
+
+	/** Constructor to be privately used by Importer */
+	IFCImporter();
+
+	/** Destructor, private as well */
+	~IFCImporter();
+
+public:
+
+	// --------------------
+	bool CanRead( const std::string& pFile, 
+		IOSystem* pIOHandler,
+		bool checkSig
+	) const;
+
+protected:
+
+	// --------------------
+	void GetExtensionList(std::set<std::string>& app);
+
+	// --------------------
+	void SetupProperties(const Importer* pImp);
+
+	// --------------------
+	void InternReadFile( const std::string& pFile, 
+		aiScene* pScene, 
+		IOSystem* pIOHandler
+	);
+
+private:
+
+
+public: 
+
+
+	// loader settings, publicy accessible via their corresponding AI_CONFIG constants
+	struct Settings 
+	{
+		Settings()
+			: skipSpaceRepresentations()
+			, skipCurveRepresentations()
+		{}
+
+
+		bool skipSpaceRepresentations;
+		bool skipCurveRepresentations;
+	};
+
+public:
+	
+	// -------------------------------------------------------------------
+	/** Prepend 'IFC: ' and throw msg.*/
+	static void ThrowException(const std::string& msg);
+
+	// -------------------------------------------------------------------
+	/** @defgroup blog Prepend 'IFC: ' and write @c message to log.*/
+	static void LogWarn  (const Formatter::format& message); //! @ingroup blog
+	static void LogError (const Formatter::format& message); //! @ingroup blog
+	static void LogInfo  (const Formatter::format& message); //! @ingroup blog
+	static void LogDebug (const Formatter::format& message); //! @ingroup blog
+
+private:
+
+	Settings settings;
+
+}; // !class IFCImporter
+
+} // end of namespace Assimp
+#endif // !INCLUDED_AI_IFC_LOADER_H

code/Importer.cpp

@@ -54,8 +54,9 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  * further imports with the same Importer instance could fail/crash/burn ...
  */
 // ------------------------------------------------------------------------------------------------
+#ifndef ASSIMP_BUILD_DEBUG
 #	define ASSIMP_CATCH_GLOBAL_EXCEPTIONS
-
+#endif
 
 // ------------------------------------------------------------------------------------------------
 // Internal headers
@@ -184,6 +185,9 @@ using namespace Assimp::Formatter;
 #ifndef ASSIMP_BUILD_NO_NDO_IMPORTER
 #	include "NDOLoader.h"
 #endif
+#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
+#	include "IFCLoader.h"
+#endif
 
 // ------------------------------------------------------------------------------------------------
 // Post processing-Steps
@@ -432,6 +436,9 @@ Importer::Importer()
 #if (!defined ASSIMP_BUILD_NO_NDO_IMPORTER)
 	pimpl->mImporter.push_back( new NDOImporter() );
 #endif
+#if (!defined ASSIMP_BUILD_NO_IFC_IMPORTER)
+	pimpl->mImporter.push_back( new IFCImporter() );
+#endif
 
 	// ----------------------------------------------------------------------------
 	// Add an instance of each post processing step here in the order 

code/LineSplitter.h

@@ -189,7 +189,7 @@ public:
 		return &cur;
 	}
 
-	const std::string& operator* () const {
+	std::string operator* () const {
 		return cur;
 	}
 

code/ParsingUtils.h

@@ -48,21 +48,54 @@ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 #include "StringComparison.h"
 namespace Assimp {
 
+	// NOTE: the functions below are mostly intended as replacement for
+	// std::upper, std::lower, std::isupper, std::islower, std::isspace.
+	// we don't bother of locales. We don't want them. We want reliable
+	// (i.e. identical) results across all locales.
+
+	// The functions below accept any character type, but know only
+	// about ASCII. However, UTF-32 is the only safe ASCII superset to
+	// use since it doesn't have multibyte sequences.
+
 // ---------------------------------------------------------------------------------
 template <class char_t>
-AI_FORCE_INLINE bool IsSpace( const char_t in)
+AI_FORCE_INLINE char_t ToLower( char_t in)
+{
+	return (in >= (char_t)'A' && in <= (char_t)'Z') ? (char_t)(in+0x20) : in;
+}
+// ---------------------------------------------------------------------------------
+template <class char_t>
+AI_FORCE_INLINE char_t ToUpper( char_t in)
+{
+	return (in >= (char_t)'a' && in <= (char_t)'z') ? (char_t)(in-0x20) : in;
+}
+// ---------------------------------------------------------------------------------
+template <class char_t>
+AI_FORCE_INLINE bool IsUpper( char_t in)
+{
+	return (in >= (char_t)'A' && in <= (char_t)'Z');
+}
+// ---------------------------------------------------------------------------------
+template <class char_t>
+AI_FORCE_INLINE bool IsLower( char_t in)
+{
+	return (in >= (char_t)'a' && in <= (char_t)'z');
+}
+// ---------------------------------------------------------------------------------
+template <class char_t>
+AI_FORCE_INLINE bool IsSpace( char_t in)
 {
 	return (in == (char_t)' ' || in == (char_t)'\t');
 }
 // ---------------------------------------------------------------------------------
 template <class char_t>
-AI_FORCE_INLINE bool IsLineEnd( const char_t in)
+AI_FORCE_INLINE bool IsLineEnd( char_t in)
 {
 	return (in == (char_t)'\r' || in == (char_t)'\n' || in == (char_t)'\0');
 }
 // ---------------------------------------------------------------------------------
 template <class char_t>
-AI_FORCE_INLINE bool IsSpaceOrNewLine( const char_t in)
+AI_FORCE_INLINE bool IsSpaceOrNewLine( char_t in)
 {
 	return IsSpace<char_t>(in) || IsLineEnd<char_t>(in);
 }

code/STEPFile.h

@@ -0,0 +1,954 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+
+----------------------------------------------------------------------
+*/
+
+#ifndef INCLUDED_AI_STEPFILE_H
+#define INCLUDED_AI_STEPFILE_H
+
+#include <boost/noncopyable.hpp>
+#include <bitset>
+
+//
+#if _MSC_VER >= 1500 || (defined __GNUC___)
+#	define ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#	else
+#	define step_unordered_map map
+#	define step_unordered_multimap multimap
+#endif
+
+#ifdef ASSIMP_STEP_USE_UNORDERED_MULTIMAP
+#	include <unordered_map>
+#	if _MSC_VER > 1600
+#		define step_unordered_map unordered_map
+#		define step_unordered_multimap unordered_multimap
+#	else
+#		define step_unordered_map tr1::unordered_map
+#		define step_unordered_multimap tr1::unordered_multimap
+#	endif
+#endif
+
+#include "LineSplitter.h"
+
+
+// uncomment this to have the loader evaluate all entities upon loading.
+// this is intended as stress test - by default, entities are evaluated
+// lazily and therefore not unless needed.
+
+//#define ASSIMP_IFC_TEST
+
+namespace Assimp {
+
+// ********************************************************************************
+// before things get complicated, this is the basic outline:
+
+
+namespace STEP {
+
+	namespace EXPRESS {
+
+		// base data types known by EXPRESS schemata - any custom data types will derive one of those
+		class DataType;
+			class UNSET;		/*: public DataType */
+			class ISDERIVED;	/*: public DataType */
+		//	class REAL;			/*: public DataType */
+			class ENUM;			/*: public DataType */
+		//	class STRING;		/*: public DataType */
+		//	class INTEGER;		/*: public DataType */
+			class ENTITY;		/*: public DataType */
+			class LIST;			/*: public DataType */
+		//	class SELECT;		/*: public DataType */
+
+		// a conversion schema is not exactly an EXPRESS schema, rather it 
+		// is a list of pointers to conversion functions to build up the 
+		// object tree from an input file.
+		class ConversionSchema;
+	}
+
+	struct HeaderInfo;
+	class Object;
+	class LazyObject;
+	class DB;
+
+
+	typedef Object* (*ConvertObjectProc)(const DB& db, const EXPRESS::LIST& params);
+}
+
+// ********************************************************************************
+
+
+namespace STEP {
+
+	// -------------------------------------------------------------------------------
+	/** Exception class used by the STEP loading & parsing code. It is typically
+	 *  coupled with a line number. */
+	// -------------------------------------------------------------------------------
+	struct SyntaxError : DeadlyImportError
+	{
+		enum {
+			LINE_NOT_SPECIFIED = 0xffffffffffffffffLL
+		};
+
+		SyntaxError (const std::string& s,uint64_t line = LINE_NOT_SPECIFIED);
+	};
+
+
+	// -------------------------------------------------------------------------------
+	/** Exception class used by the STEP loading & parsing code when a type
+	 *  error (i.e. an entity expects a string but receives a bool) occurs.
+	 *  It is typically coupled with both an entity id and a line number.*/
+	// -------------------------------------------------------------------------------
+	struct TypeError : DeadlyImportError
+	{
+		enum {
+			ENTITY_NOT_SPECIFIED = 0xffffffffffffffffLL
+		};
+
+		TypeError (const std::string& s,uint64_t entity = ENTITY_NOT_SPECIFIED, uint64_t line = SyntaxError::LINE_NOT_SPECIFIED);
+	};
+
+
+	// hack to make a given member template-dependent 
+	template <typename T, typename T2>
+	T2& Couple(T2& in) {
+		return in;
+	}
+
+
+	namespace EXPRESS {
+
+		// -------------------------------------------------------------------------------
+		//** Base class for all STEP data types */
+		// -------------------------------------------------------------------------------
+		class DataType 
+		{
+		public:
+
+			typedef const DataType* Out;
+
+		public:
+
+			virtual ~DataType() {
+			}
+
+		public:
+
+			template <typename T>
+			const T& To() const {
+				return dynamic_cast<const T&>(*this);
+			}
+
+			template <typename T>
+			T& To() {
+				return dynamic_cast<T&>(*this);
+			}
+
+
+			template <typename T>
+			const T* ToPtr() const {
+				return dynamic_cast<const T*>(this);
+			}
+
+			template <typename T>
+			T* ToPtr() {
+				return dynamic_cast<T*>(this);
+			}
+
+			// utilities to deal with SELECT entities, which currently lack automatic
+			// conversion support.
+			template <typename T>
+			const T& ResolveSelect(const DB& db) const {
+				return Couple<T>(db).MustGetObject(To<EXPRESS::ENTITY>())->To<T>();
+			}
+
+			template <typename T>
+			const T* ResolveSelectPtr(const DB& db) const {
+				const EXPRESS::ENTITY* e = ToPtr<EXPRESS::ENTITY>();
+				return e?Couple<T>(db).MustGetObject(*e)->ToPtr<T>():(const T*)0;
+			}
+
+		public:
+
+			/** parse a variable from a string and set 'inout' to the character 
+			 *  behind the last consumed character. An optional schema enables,
+			 *  if specified, automatic conversion of custom data types.
+			 *
+			 *  @throw SyntaxError
+			 */
+			static const DataType* Parse(const char*& inout,
+				uint64_t line							= SyntaxError::LINE_NOT_SPECIFIED,
+				const EXPRESS::ConversionSchema* schema = NULL);
+
+		public:
+		};
+
+		typedef DataType SELECT;
+		typedef DataType LOGICAL;
+
+		// -------------------------------------------------------------------------------
+		/** Sentinel class to represent explicitly unset (optional) fields ($) */
+		// -------------------------------------------------------------------------------
+		class UNSET : public DataType 
+		{
+		public:
+		private:
+		};
+
+		// -------------------------------------------------------------------------------
+		/** Sentinel class to represent explicitly derived fields (*) */
+		// -------------------------------------------------------------------------------
+		class ISDERIVED : public DataType 
+		{
+		public:
+		private:
+		};
+
+		// -------------------------------------------------------------------------------
+		/** Shared implementation for some of the primitive data type, i.e. int, float */
+		// -------------------------------------------------------------------------------
+		template <typename T>
+		class PrimitiveDataType : public DataType 
+		{
+		public:
+
+			// This is the type that will ultimatively be used to
+			// expose this data type to the user.
+			typedef T Out;
+
+		public:
+
+			PrimitiveDataType() {}
+			PrimitiveDataType(const T& val) 
+				: val(val)
+			{}
+
+			PrimitiveDataType(const PrimitiveDataType& o) {
+				(*this) = o;
+			}
+
+		public:
+
+			operator const T& () const {
+				return val;
+			}
+
+			PrimitiveDataType& operator=(const PrimitiveDataType& o) {
+				val = o.val;
+				return *this;
+			}
+
+		protected:
+			T val;
+
+		};
+
+		typedef PrimitiveDataType<int64_t>			INTEGER; 
+		typedef PrimitiveDataType<float>			REAL; 
+		typedef PrimitiveDataType<float>			NUMBER; 
+		typedef PrimitiveDataType<std::string>		STRING; 
+		
+
+
+		// -------------------------------------------------------------------------------
+		/** Generic base class for all enumerated types */
+		// -------------------------------------------------------------------------------
+		class ENUMERATION : public STRING 
+		{
+		public:
+
+			ENUMERATION (const std::string& val)
+				: STRING(val)
+			{}
+
+		private:
+		};
+		
+		typedef ENUMERATION BOOLEAN;
+
+		// -------------------------------------------------------------------------------
+		/** This is just a reference to an entity/object somewhere else */
+		// -------------------------------------------------------------------------------
+		class ENTITY : public PrimitiveDataType<uint64_t>
+		{
+		public:
+
+			ENTITY(uint64_t val)
+				: PrimitiveDataType<uint64_t>(val)
+			{
+				ai_assert(val!=0);
+			}
+
+			ENTITY()
+				: PrimitiveDataType<uint64_t>(TypeError::ENTITY_NOT_SPECIFIED)
+			{
+			}
+
+		private:
+		};
+
+		// -------------------------------------------------------------------------------
+		/** Wrap any STEP aggregate: LIST, SET, ... */
+		// -------------------------------------------------------------------------------
+		class LIST : public DataType 
+		{
+		public:
+
+			// access a particular list index, throw std::range_error for wrong indices 
+			const DataType* operator[] (size_t index) const {
+				return members[index].get();
+			}
+
+			size_t GetSize() const {
+				return members.size();
+			}
+
+		public:
+
+			/** @see DaraType::Parse */
+			static const LIST* Parse(const char*& inout,
+				uint64_t line							= SyntaxError::LINE_NOT_SPECIFIED,
+				const EXPRESS::ConversionSchema* schema = NULL);
+
+
+		private:
+			typedef std::vector< boost::shared_ptr<const DataType> > MemberList;
+			MemberList members;
+		};
+
+
+		// -------------------------------------------------------------------------------
+		/* Not exactly a full EXPRESS schema but rather a list of conversion functions
+		 * to extract valid C++ objects out of a STEP file. Those conversion functions
+		 * may, however, perform further schema validations. */
+		// -------------------------------------------------------------------------------
+		class ConversionSchema
+		{
+
+		public:
+
+			struct SchemaEntry {
+				SchemaEntry(const char* name,ConvertObjectProc func)
+					: name(name)
+					, func(func)
+				{}
+			
+				const char* name;
+				ConvertObjectProc func;
+			};
+
+		public:
+
+			template <size_t N> 
+			explicit ConversionSchema( const SchemaEntry (& schemas)[N]) {
+				*this = schemas;
+			}
+
+			ConversionSchema() {}
+
+		public:
+
+			ConvertObjectProc GetConverterProc(const std::string& name) const {
+				std::map<std::string,ConvertObjectProc>::const_iterator it = converters.find(name);
+				return it == converters.end() ? NULL : (*it).second;
+			}
+
+
+			bool IsKnownToken(const std::string& name) const {
+				return converters.find(name) != converters.end();
+			}
+
+
+			template <size_t N> 
+			const ConversionSchema& operator=( const SchemaEntry (& schemas)[N]) {
+				for(size_t i = 0; i < N; ++i ) {
+					const SchemaEntry& schema = schemas[i];
+					converters[schema.name] = schema.func;
+				}
+				return *this;
+			}
+
+		private:
+
+			std::map<std::string,ConvertObjectProc> converters;
+		};
+	}
+
+
+
+	// ------------------------------------------------------------------------------
+	/** Bundle all the relevant info from a STEP header, parts of which may later
+	 *  be plainly dumped to the logfile, whereas others may help the caller pick an
+	 *  appropriate loading strategy.*/
+	// ------------------------------------------------------------------------------
+	struct HeaderInfo
+	{
+		std::string timestamp;
+		std::string app;
+		std::string fileSchema;
+	};
+
+
+	// ------------------------------------------------------------------------------
+	/** Base class for all concrete object instances */
+	// ------------------------------------------------------------------------------
+	class Object 
+	{
+	public:
+
+		virtual ~Object() {}
+
+	public:
+
+		// utilities to simplify casting to concrete types
+		template <typename T>
+		const T& To() const {
+			return dynamic_cast<const T&>(*this);
+		}
+
+		template <typename T>
+		T& To() {
+			return dynamic_cast<T&>(*this);
+		}
+
+
+		template <typename T>
+		const T* ToPtr() const {
+			return dynamic_cast<const T*>(this);
+		}
+
+		template <typename T>
+		T* ToPtr() {
+			return dynamic_cast<T*>(this);
+		}
+
+	public:
+
+		uint64_t GetID() const {
+			return id;
+		}
+
+		std::string GetClassName() const {
+			// strictly speaking this relies on unspecified behaviour - we hijack the name() field of std::type_info
+			const char* s = typeid(*this).name(), *s2 = strstr(s,"IFC::");
+			return std::string(s2?s2+5:s);
+		}
+
+		void SetID(uint64_t newval) {
+			id = newval;
+		}
+
+	private:
+		uint64_t id;
+	};
+
+
+	template <typename T>
+	size_t GenericFill(const STEP::DB& db, const EXPRESS::LIST& params, T* in);
+	// (intentionally undefined)
+
+
+	// ------------------------------------------------------------------------------
+	/** CRTP shared base class for use by concrete entity implementation classes */
+	// ------------------------------------------------------------------------------
+	template <typename TDerived, size_t arg_count>
+	struct ObjectHelper : virtual Object  
+	{
+		ObjectHelper() : aux_is_derived(0) {}
+
+		static Object* Construct(const STEP::DB& db, const EXPRESS::LIST& params) {
+			// make sure we don't leak if Fill() throws an exception
+			std::auto_ptr<TDerived> impl(new TDerived()); 
+
+			// GenericFill<T> is undefined so we need to have a specialization
+			const size_t num_args = GenericFill<TDerived>(db,params,&*impl);
+			
+			// the following check is commented because it will always trigger if
+			// parts of the entities are generated with dummy wrapper code.
+			// This is currently done to reduce the size of the loader 
+			// code.
+			//if (num_args != params.GetSize() && impl->GetClassName() != "NotImplemented") {
+			//	DefaultLogger::get()->debug("STEP: not all parameters consumed");
+			//}
+			return impl.release();
+		}
+
+		// note that this member always exists multiple times within the hierarchy
+		// of an individual object, so any access to it must be disambiguated.
+		std::bitset<arg_count> aux_is_derived;
+	};
+
+	// ------------------------------------------------------------------------------
+	/** Class template used to represent OPTIONAL data members in the converted schema */
+	// ------------------------------------------------------------------------------
+	template <typename T>
+	struct Maybe 
+	{
+		Maybe() : have() {}
+		explicit Maybe(const T& ptr) : ptr(ptr), have(true) {
+		}
+
+
+		void flag_invalid() {
+			have = false;
+		}
+
+		void flag_valid() {
+			have = true;
+		}
+
+		
+		bool operator! () const {
+			return !have;
+		}
+
+		operator bool() const {
+			return have;
+		}
+
+		operator const T&() const {
+			return Get();
+		}
+
+		const T& Get() const {
+			ai_assert(have);
+			return ptr;
+		}
+
+		Maybe& operator=(const T& _ptr) {
+			ptr = _ptr;
+			have = true;
+			return *this;
+		}
+
+	private:
+
+		template <typename T2> friend struct InternGenericConvert;
+
+		operator T&() {
+			return ptr;
+		}
+
+		T ptr;
+		bool have;
+	};
+
+	// ------------------------------------------------------------------------------
+	/** A LazyObject is created when needed. Before this happens, we just keep
+       the text line that contains the object definition. */
+	// -------------------------------------------------------------------------------
+	class LazyObject : public boost::noncopyable
+	{
+		friend class DB;
+	public:
+
+		LazyObject(DB& db, uint64_t id,uint64_t line,const std::string& type,const std::string& args);
+		~LazyObject();
+
+	public:
+
+		Object& operator * () {
+			if (!obj) {
+				LazyInit();
+				ai_assert(obj);
+			}
+			return *obj;
+		}
+
+		const Object& operator * () const {
+			if (!obj) {
+				LazyInit();
+				ai_assert(obj);
+			}
+			return *obj;
+		}
+
+		template <typename T>
+		const T& To() const {
+			return dynamic_cast<const T&>( **this );
+		}
+
+		template <typename T>
+		T& To()  {
+			return dynamic_cast<T&>( **this );
+		}
+
+		template <typename T>
+		const T* ToPtr() const {
+			return dynamic_cast<const T*>( &**this );
+		}
+
+		template <typename T>
+		T* ToPtr()  {
+			return dynamic_cast<T*>( &**this );
+		}
+
+		Object* operator -> () {
+			return &**this;
+		}
+
+		const Object* operator -> () const {
+			return &**this;
+		}
+
+		bool operator== (const std::string& atype) const {
+			return type == atype;
+		}
+
+		bool operator!= (const std::string& atype) const {
+			return type != atype;
+		}
+
+	private:
+
+		void LazyInit() const;
+
+	private:
+
+		const uint64_t id, line;
+		const std::string type;
+		DB& db;
+
+		const EXPRESS::LIST* conv_args;
+		mutable Object* obj;
+	};
+
+	template <typename T>
+	inline bool operator==( boost::shared_ptr<LazyObject> lo, T whatever ) {
+		return *lo == whatever; // XXX use std::forward if we have 0x
+	}
+
+	template <typename T>
+	inline bool operator==( const std::pair<uint64_t, boost::shared_ptr<LazyObject> >& lo, T whatever ) {
+		return *(lo.second) == whatever; // XXX use std::forward if we have 0x
+	}
+
+
+	// ------------------------------------------------------------------------------
+	/** Class template used to represent lazily evaluated object references in the converted schema */
+	// ------------------------------------------------------------------------------
+	template <typename T>
+	struct Lazy
+	{
+		typedef Lazy Out;
+		Lazy(const LazyObject* obj = NULL) : obj(obj) {
+		}
+		
+		operator const T&() const {
+			return obj->To<T>();
+		}
+
+		const T& operator * () const {
+			return obj->To<T>();
+		}
+
+		const T* operator -> () const {
+			return &obj->To<T>();
+		}
+
+		const LazyObject* obj;
+	};
+
+	// ------------------------------------------------------------------------------
+	/** Class template used to represent LIST and SET data members in the converted schema */
+	// ------------------------------------------------------------------------------
+	template <typename T, uint64_t min_cnt, uint64_t max_cnt=0uL>
+	struct ListOf : public std::vector<typename T::Out>
+	{
+		typedef typename T::Out OutScalar;
+		typedef ListOf Out;
+
+		BOOST_STATIC_ASSERT(min_cnt <= max_cnt || !max_cnt);
+		ListOf() {
+		}
+
+	};
+
+
+	// ------------------------------------------------------------------------------
+	template <typename TOut>
+	struct PickBaseType {
+		typedef EXPRESS::PrimitiveDataType<TOut> Type;
+	};
+
+	template <typename TOut>
+	struct PickBaseType< Lazy<TOut> > {
+		typedef EXPRESS::ENTITY Type;
+	};
+
+	template <> struct PickBaseType<EXPRESS::DataType*>;
+
+	// ------------------------------------------------------------------------------
+	template <typename T>
+	struct InternGenericConvert {
+		void operator()(T& out, const EXPRESS::DataType& in, const STEP::DB& db) {
+			try{
+				out = dynamic_cast< const typename PickBaseType<T>::Type& > ( in );
+			}
+			catch(std::bad_cast&) {
+				throw TypeError("type error reading literal field");
+			}
+		}
+	};
+
+	template <>
+	struct InternGenericConvert<const EXPRESS::DataType*> {
+		void operator()(const EXPRESS::DataType*& out, const EXPRESS::DataType& in, const STEP::DB& db) {
+			out = &in;
+		}
+	};
+
+	template <typename T>
+	struct InternGenericConvert< Maybe<T> > {
+		void operator()(Maybe<T>& out, const EXPRESS::DataType& in, const STEP::DB& db) {
+			GenericConvert((T&)out,in,db);
+			out.flag_valid();
+		}
+	};
+
+	template <typename T,uint64_t min_cnt, uint64_t max_cnt>
+	struct InternGenericConvertList {
+		void operator()(ListOf<T, min_cnt, max_cnt>& out, const EXPRESS::DataType& inp_base, const STEP::DB& db) {
+
+			const EXPRESS::LIST* inp = dynamic_cast<const EXPRESS::LIST*>(&inp_base);
+			if (!inp) {
+				throw TypeError("type error reading aggregate");
+			}
+
+			// XXX is this really how the EXPRESS notation ([?:3],[1:3]) .. works?
+			// too many is warning, too few is critical error because the user won't validate this
+			if (max_cnt && inp->GetSize() > max_cnt) {
+				DefaultLogger::get()->warn("too many aggregate elements");
+			}
+			else if (inp->GetSize() < min_cnt) {
+				throw TypeError("too few aggregate elements");
+			}
+
+			out.reserve(inp->GetSize());
+			for(size_t i = 0; i < inp->GetSize(); ++i) {
+
+				out.push_back( typename ListOf<T, min_cnt, max_cnt>::OutScalar() );
+				try{
+					GenericConvert(out.back(),*(*inp)[i], db);
+				}
+				catch(const TypeError& t) {
+					throw TypeError(t.what() +std::string(" of aggregate"));
+				}
+			}
+		}
+	};
+
+	template <typename T>
+	struct InternGenericConvert< Lazy<T> > {
+		void operator()(Lazy<T>& out, const EXPRESS::DataType& in_base, const STEP::DB& db) {
+			const EXPRESS::ENTITY* in = dynamic_cast<const EXPRESS::ENTITY*>(&in_base);
+			if (!in) {
+				throw TypeError("type error reading entity");
+			}
+			out = Couple<T>(db).GetObject(*in);
+		}
+	};
+
+	template <typename T1>
+	inline void GenericConvert(T1& a, const EXPRESS::DataType& b, const STEP::DB& db) {
+		return InternGenericConvert<T1>()(a,b,db);
+	}
+
+	template <typename T1,uint64_t N1, uint64_t N2>
+	inline void GenericConvert(ListOf<T1,N1,N2>& a, const EXPRESS::DataType& b, const STEP::DB& db) {
+		return InternGenericConvertList<T1,N1,N2>()(a,b,db);
+	}
+
+
+	// ------------------------------------------------------------------------------
+	/** Lightweight manager class that holds the map of all objects in a 
+	 *  STEP file. DB's are exclusively maintained by the functions in
+	 *  STEPFileReader.h*/
+	// -------------------------------------------------------------------------------
+	class DB
+	{
+		friend DB* ReadFileHeader(boost::shared_ptr<IOStream> stream);
+		friend void ReadFile(DB& db,const EXPRESS::ConversionSchema& scheme);
+		friend class LazyObject;
+
+	public:
+
+		// objects indexed by ID
+		typedef std::map<uint64_t,boost::shared_ptr<const LazyObject> > ObjectMap;
+
+		// objects indexed by their declarative type
+		typedef std::step_unordered_multimap<std::string, const LazyObject* > ObjectMapByType;
+		typedef std::pair<ObjectMapByType::const_iterator,ObjectMapByType::const_iterator> ObjectMapRange;
+
+		// references - for each object id the ids of all objects which reference it
+		typedef std::multimap<uint64_t, uint64_t > RefMap;
+		typedef std::pair<RefMap::const_iterator,RefMap::const_iterator> RefMapRange;
+
+	private:
+
+		DB(boost::shared_ptr<StreamReaderLE> reader) 
+			: reader(reader)
+			, splitter(*reader,true,true)
+			, evaluated_count()
+		{}
+
+	public:
+
+		uint64_t GetObjectCount() const {
+			return objects.size();
+		}
+
+		uint64_t GetEvaluatedObjectCount() const {
+			return evaluated_count;
+		}
+
+		const HeaderInfo& GetHeader() const {
+			return header;
+		}
+
+		const EXPRESS::ConversionSchema& GetSchema() const {
+			return *schema;
+		}
+
+		const ObjectMap& GetObjects() const {
+			return objects;
+		}
+
+		const ObjectMapByType& GetObjectsByType() const {
+			return objects_bytype;
+		}
+
+		const RefMap& GetRefs() const {
+			return refs;
+		}
+
+
+		// get the yet unevaluated object record with a given id
+		const LazyObject* GetObject(uint64_t id) const {
+			const ObjectMap::const_iterator it = objects.find(id);
+			if (it != objects.end()) {
+				return (*it).second.get();
+			}
+			return NULL;
+		}
+
+
+		// get an arbitrary object out of the soup with the only restriction being its type.
+		const LazyObject* GetObject(const std::string& type) const {
+			const ObjectMapByType::const_iterator it = objects_bytype.find(type);
+			if (it != objects_bytype.end()) {
+				return (*it).second;
+			}
+			return NULL;
+		}
+
+		// same, but raise an exception if the object doesn't exist and return a reference
+		const LazyObject& MustGetObject(uint64_t id) const {
+			const LazyObject* o = GetObject(id);
+			if (!o) {
+				throw TypeError("requested entity is not present",id);
+			}
+			return *o;
+		}
+
+		const LazyObject& MustGetObject(const std::string& type) const {
+			const LazyObject* o = GetObject(type);
+			if (!o) {
+				throw TypeError("requested entity of type "+type+"is not present");
+			}
+			return *o;
+		}
+
+
+#ifdef ASSIMP_IFC_TEST
+
+		// evaluate *all* entities in the file. this is a power test for the loader
+		void EvaluateAll() {
+			BOOST_FOREACH(ObjectMap::value_type& e,objects) {
+				**e.second;
+			}
+			ai_assert(evaluated_count == objects.size());
+		}
+
+#endif
+
+	private:
+
+		// full access only offered to close friends - they should 
+		// use the provided getters rather than messing around with
+		// the members directly.
+		LineSplitter& GetSplitter() {
+			return splitter;
+		}
+
+		void InternInsert(boost::shared_ptr<LazyObject> lz) {
+			objects[lz->id] = lz;
+			objects_bytype.insert(std::make_pair(lz->type,lz.get()));
+		}
+
+		void SetSchema(const EXPRESS::ConversionSchema& _schema) {
+			schema = &_schema;
+		}
+
+		HeaderInfo& GetHeader() {
+			return header;
+		}
+
+		void MarkRef(uint64_t who, uint64_t by_whom) {
+			refs.insert(std::make_pair(who,by_whom));
+		}
+
+	private:
+
+		HeaderInfo header;
+		ObjectMap objects;
+		ObjectMapByType objects_bytype;
+		RefMap refs;
+
+		boost::shared_ptr<StreamReaderLE> reader;
+		LineSplitter splitter;
+
+		uint64_t evaluated_count;
+
+		const EXPRESS::ConversionSchema* schema;
+	};
+
+}
+
+
+} // end Assimp
+#endif

code/STEPFileReader.cpp

@@ -0,0 +1,445 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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  STEPFileReader.cpp
+ *  @brief Implementation of the STEP file parser, which fills a 
+ *     STEP::DB with data read from a file.
+ */
+#include "AssimpPCH.h"
+#include "STEPFileReader.h"
+#include "TinyFormatter.h"
+#include "fast_atof.h"
+
+using namespace Assimp;
+namespace EXPRESS = STEP::EXPRESS;
+
+#include <functional>
+
+// ------------------------------------------------------------------------------------------------
+// From http://stackoverflow.com/questions/216823/whats-the-best-way-to-trim-stdstring
+
+// trim from start
+static inline std::string &ltrim(std::string &s) {
+	s.erase(s.begin(), std::find_if(s.begin(), s.end(), std::not1( std::ptr_fun(Assimp::IsSpace<char>))));
+	return s;
+}
+
+// trim from end
+static inline std::string &rtrim(std::string &s) {
+	s.erase(std::find_if(s.rbegin(), s.rend(), std::not1( std::ptr_fun(Assimp::IsSpace<char>))).base());
+	return s;
+}
+// trim from both ends
+static inline std::string &trim(std::string &s) {
+	return ltrim(rtrim(s));
+}
+
+
+
+
+// ------------------------------------------------------------------------------------------------
+std::string AddLineNumber(const std::string& s,uint64_t line /*= LINE_NOT_SPECIFIED*/, const std::string& prefix = "") 
+{
+	return line == STEP::SyntaxError::LINE_NOT_SPECIFIED ? prefix+s : static_cast<std::string>( (Formatter::format(),prefix,"(line ",line,") ",s) );
+}
+
+
+// ------------------------------------------------------------------------------------------------
+std::string AddEntityID(const std::string& s,uint64_t entity /*= ENTITY_NOT_SPECIFIED*/, const std::string& prefix = "") 
+{
+	return entity == STEP::TypeError::ENTITY_NOT_SPECIFIED ? prefix+s : static_cast<std::string>( (Formatter::format(),prefix,"(entity #",entity,") ",s));
+}
+
+
+// ------------------------------------------------------------------------------------------------
+STEP::SyntaxError::SyntaxError (const std::string& s,uint64_t line /* = LINE_NOT_SPECIFIED */)
+: DeadlyImportError(AddLineNumber(s,line))
+{
+
+}
+
+// ------------------------------------------------------------------------------------------------
+STEP::TypeError::TypeError (const std::string& s,uint64_t entity /* = ENTITY_NOT_SPECIFIED */,uint64_t line /*= LINE_NOT_SPECIFIED*/)
+: DeadlyImportError(AddLineNumber(AddEntityID(s,entity),line))
+{
+
+}
+
+
+// ------------------------------------------------------------------------------------------------
+STEP::DB* STEP::ReadFileHeader(boost::shared_ptr<IOStream> stream)
+{
+	boost::shared_ptr<StreamReaderLE> reader = boost::shared_ptr<StreamReaderLE>(new StreamReaderLE(stream));
+	std::auto_ptr<STEP::DB> db = std::auto_ptr<STEP::DB>(new STEP::DB(reader));
+
+	LineSplitter& splitter = db->GetSplitter();
+	if (!splitter || *splitter != "ISO-10303-21;") {
+		throw STEP::SyntaxError("expected magic token: ISO-10303-21",1);
+	}
+
+	HeaderInfo& head = db->GetHeader();
+	for(++splitter; splitter; ++splitter) {
+		const std::string& s = *splitter;
+		if (s == "DATA;") {
+			// here we go, header done, start of data section
+			++splitter;
+			break;
+		}
+
+		// want one-based line numbers for human readers, so +1
+		const uint64_t line = splitter.get_index()+1;
+
+		if (s.substr(0,11) == "FILE_SCHEMA") {
+			const char* sz = s.c_str()+11;
+			SkipSpaces(sz,&sz);
+			std::auto_ptr< const EXPRESS::DataType > schema = std::auto_ptr< const EXPRESS::DataType >( EXPRESS::DataType::Parse(sz) );
+
+			// the file schema should be a regular list entity, although it usually contains exactly one entry
+			// since the list itself is contained in a regular parameter list, we actually have
+			// two nested lists.
+			const EXPRESS::LIST* list = dynamic_cast<const EXPRESS::LIST*>(schema.get());
+			if (list && list->GetSize()) {
+				list = dynamic_cast<const EXPRESS::LIST*>( (*list)[0] );
+				if (!list) {
+					throw STEP::SyntaxError("expected FILE_SCHEMA to be a list",line);
+				}
+
+				// XXX need support for multiple schemas?
+				if (list->GetSize() > 1)	{
+					DefaultLogger::get()->warn(AddLineNumber("multiple schemas currently not supported",line));
+				}
+				const EXPRESS::STRING* string;
+				if (!list->GetSize() || !(string=dynamic_cast<const EXPRESS::STRING*>( (*list)[0] ))) {
+					throw STEP::SyntaxError("expected FILE_SCHEMA to contain a single string literal",line);
+				}
+				head.fileSchema =  *string;
+			}
+		}
+
+		// XXX handle more header fields
+	}
+
+	return db.release();
+}
+
+
+// ------------------------------------------------------------------------------------------------
+void STEP::ReadFile(DB& db,const EXPRESS::ConversionSchema& scheme)
+{
+	db.SetSchema(scheme);
+
+	const DB::ObjectMap& map = db.GetObjects();
+	LineSplitter& splitter = db.GetSplitter();
+	for(; splitter; ++splitter) {
+		const std::string& s = *splitter;
+		if (s == "ENDSEC;") {
+			break;
+		}
+
+		// want one-based line numbers for human readers, so +1
+		const uint64_t line = splitter.get_index()+1;
+
+		// LineSplitter already ignores empty lines
+		ai_assert(s.length());
+		if (s[0] != '#') {
+			DefaultLogger::get()->warn(AddLineNumber("expected token \'#\'",line));
+			continue;
+		}
+
+		// ---
+		// extract id, entity class name and argument string,
+		// but don't create the actual object yet. 
+		// ---
+
+		const std::string::size_type n0 = s.find_first_of('=');
+		if (n0 == std::string::npos) {
+			DefaultLogger::get()->warn(AddLineNumber("expected token \'=\'",line));
+			continue;
+		}
+
+		const uint64_t id = strtoul10_64(s.substr(1,n0-1).c_str());
+		if (!id) {
+			DefaultLogger::get()->warn(AddLineNumber("expected positive, numeric entity id",line));
+			continue;
+		}
+
+		const std::string::size_type n1 = s.find_first_of('(',n0);
+		if (n1 == std::string::npos) {
+			DefaultLogger::get()->warn(AddLineNumber("expected token \'(\'",line));
+			continue;
+		}
+
+		const std::string::size_type n2 = s.find_last_of(')');
+		if (n2 == std::string::npos || n2 < n1) {
+			DefaultLogger::get()->warn(AddLineNumber("expected token \')\'",line));
+			continue;
+		}
+
+		if (map.find(id) != map.end()) {
+			DefaultLogger::get()->warn(AddLineNumber((Formatter::format(),"an object with the id #",id," already exists"),line));
+		}
+
+		std::string type = s.substr(n0+1,n1-n0-1);
+		trim(type);
+		std::transform( type.begin(), type.end(), type.begin(), &Assimp::ToLower<char>  );
+		db.InternInsert(boost::shared_ptr<LazyObject>(new LazyObject(db,id,line,type,s.substr(n1,n2-n1+1))));
+	}
+
+	if (!splitter) {
+		DefaultLogger::get()->warn("STEP: ignoring unexpected EOF");
+	}
+
+	if ( !DefaultLogger::isNullLogger() ){
+		DefaultLogger::get()->debug((Formatter::format(),"STEP: got ",map.size()," object records"));
+	}
+}
+
+
+// ------------------------------------------------------------------------------------------------
+const EXPRESS::DataType* EXPRESS::DataType::Parse(const char*& inout,uint64_t line, const EXPRESS::ConversionSchema* schema /*= NULL*/)
+{
+	const char* cur = inout;
+	SkipSpaces(&cur);
+
+	if (*cur == ',' || IsSpaceOrNewLine(*cur)) {
+		throw STEP::SyntaxError("unexpected token, expected parameter",line);
+	}
+
+	// just skip over constructions such as IFCPLANEANGLEMEASURE(0.01) and read only the value
+	if (schema) {
+		bool ok = false;
+		for(const char* t = cur; *t && *t != ')' && *t != ','; ++t) {
+			if (*t=='(') {
+				if (!ok) {
+					break;
+				}
+				for(--t;IsSpace(*t);--t);
+				std::string s(cur,static_cast<size_t>(t-cur+1));
+				std::transform(s.begin(),s.end(),s.begin(),&ToLower<char> );
+				if (schema->IsKnownToken(s)) {
+					for(cur = t+1;*cur++ != '(';);
+					const EXPRESS::DataType* const dt = Parse(cur);
+					inout = *cur ? cur+1 : cur;
+					return dt;
+				}
+				break;
+			}
+			else if (!IsSpace(*t)) {
+				ok = true;
+			}
+		}
+	}
+
+	if (*cur == '*' ) {
+		inout = cur+1;
+		return new EXPRESS::ISDERIVED();
+	}
+	else if (*cur == '$' ) {
+		inout = cur+1;
+		return new EXPRESS::UNSET();
+	}
+	else if (*cur == '(' ) {
+		// start of an aggregate, further parsing is done by the LIST factory constructor
+		inout = cur;
+		return EXPRESS::LIST::Parse(inout,line,schema);
+	}
+	else if (*cur == '.' ) {
+		// enum (includes boolean)
+		const char* start = ++cur;
+		for(;*cur != '.';++cur) {
+			if (*cur == '\0') {
+				throw STEP::SyntaxError("enum not closed",line);
+			}
+		}
+		inout = cur+1;
+		return new EXPRESS::ENUMERATION( std::string(start, static_cast<size_t>(cur-start) ));
+	}
+	else if (*cur == '#' ) {
+		// object reference
+		return new EXPRESS::ENTITY(strtoul10_64(++cur,&inout));
+	}
+	else if (*cur == '\'' ) {
+		// string literal
+		const char* start = ++cur;
+		for(;*cur != '\'';++cur) {
+			if (*cur == '\0') {
+				throw STEP::SyntaxError("string literal not closed",line);
+			}
+		}
+		if (cur[1]=='\'') {
+			for(cur+=2;*cur != '\'';++cur) {
+				if (*cur == '\0') {
+					throw STEP::SyntaxError("string literal not closed",line);
+				}
+			}
+		}
+		inout = cur+1;
+		return new EXPRESS::STRING( std::string(start, static_cast<size_t>(cur-start) ));
+	}
+	else if (*cur == '\"' ) {
+		throw STEP::SyntaxError("binary data not supported yet",line);
+	}
+
+	// else -- must be a number. if there is a decimal dot in it,
+	// parse it as real value, otherwise as integer.
+	const char* start = cur;
+	for(;*cur  && *cur != ',' && *cur != ')' && !IsSpace(*cur);++cur) {
+		if (*cur == '.') {
+			// XXX many STEP files contain extremely accurate data, float's precision may not suffice in many cases
+			float f;
+			inout = fast_atof_move(start,f);
+			return new EXPRESS::REAL(f);
+		}
+	}
+
+	bool neg = false;
+	if (*start == '-') {
+		neg = true;
+		++start;
+	}
+	else if (*start == '+') {
+		++start;
+	}
+	int64_t num = static_cast<int64_t>( strtoul10_64(start,&inout) );
+	return new EXPRESS::INTEGER(neg?-num:num);
+}
+
+
+// ------------------------------------------------------------------------------------------------
+const EXPRESS::LIST* EXPRESS::LIST::Parse(const char*& inout,uint64_t line, const EXPRESS::ConversionSchema* schema /*= NULL*/)
+{
+	std::auto_ptr<EXPRESS::LIST> list(new EXPRESS::LIST());
+	EXPRESS::LIST::MemberList& members = list->members;
+
+	const char* cur = inout;
+	if (*cur++ != '(') {
+		throw STEP::SyntaxError("unexpected token, expected \'(\' token at beginning of list",line);
+	}
+
+	// estimate the number of items upfront - lists can grow large
+	size_t count = 1;
+	for(const char* c=cur; *c && *c != ')'; ++c) {
+		count += (*c == ',' ? 1 : 0);
+	}
+
+	members.reserve(count);
+
+	for(;;++cur) {
+		if (!*cur) {
+			throw STEP::SyntaxError("unexpected end of line while reading list");
+		}
+		SkipSpaces(cur,&cur);
+		if (*cur == ')') {
+			break;
+		}
+		
+		members.push_back( boost::shared_ptr<const EXPRESS::DataType>(EXPRESS::DataType::Parse(cur,line,schema)));
+		SkipSpaces(cur,&cur);
+
+		if (*cur != ',') {
+			if (*cur == ')') {
+				break;
+			}
+			throw STEP::SyntaxError("unexpected token, expected \',\' or \')\' token after list element",line);
+		}
+	}
+
+	inout = cur+1;
+	return list.release();
+}
+
+// ------------------------------------------------------------------------------------------------
+STEP::LazyObject::LazyObject(DB& db, uint64_t id,uint64_t line,const std::string& type,const std::string& args) 
+	: db(db)
+	, id(id)
+	, line(line)
+	, type(type)
+	, obj()
+	// need to initialize this upfront, otherwise the destructor
+	// will crash if an exception is thrown in the c'tor
+	, conv_args() 
+{
+	const char* arg = args.c_str();
+	conv_args = EXPRESS::LIST::Parse(arg,line,&db.GetSchema());
+
+	// find any external references and store them in the database.
+	// this helps us emulate STEPs INVERSE fields.
+	for (size_t i = 0; i < conv_args->GetSize(); ++i) {
+		const EXPRESS::DataType* t = conv_args->operator [](i);
+		if (const EXPRESS::ENTITY* e = t->ToPtr<EXPRESS::ENTITY>()) {
+			db.MarkRef(*e,id);
+		}
+	}
+}
+
+// ------------------------------------------------------------------------------------------------
+STEP::LazyObject::~LazyObject() 
+{
+	// 'obj' always remains in our possession, so there is 
+	// no need for a smart pointer type.
+	delete obj;
+	delete conv_args;
+}
+
+
+// ------------------------------------------------------------------------------------------------
+void STEP::LazyObject::LazyInit() const
+{
+	const EXPRESS::ConversionSchema& schema = db.GetSchema();
+	STEP::ConvertObjectProc proc = schema.GetConverterProc(type);
+
+	if (!proc) {
+		throw STEP::TypeError("unknown object type: " + type,id,line);
+	}
+
+	// if the converter fails, it should throw an exception, but it should never return NULL
+	try {
+		obj = proc(db,*conv_args);
+	}
+	catch(const TypeError& t) {
+		// augment line and entity information
+		throw TypeError(t.what(),id,line);
+	}
+	++db.evaluated_count;
+	ai_assert(obj);
+
+	// store the original id in the object instance
+	obj->SetID(id);
+}

code/STEPFileReader.h

@@ -0,0 +1,64 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+
+----------------------------------------------------------------------
+*/
+
+#ifndef INCLUDED_AI_STEPFILEREADER_H
+#define INCLUDED_AI_STEPFILEREADER_H
+
+#include "STEPFile.h"
+
+namespace Assimp {
+namespace STEP {
+
+	// ### Parsing a STEP file is a twofold procedure ###
+
+	// --------------------------------------------------------------------------
+	// 1) read file header and return to caller, who checks if the 
+	//    file is of a supported schema ..
+	DB* ReadFileHeader(boost::shared_ptr<IOStream> stream);
+
+	// --------------------------------------------------------------------------
+	// 2) read the actual file contents using a user-supplied set of
+	//    conversion functions to interpret the data.
+	void ReadFile(DB& db,const EXPRESS::ConversionSchema& scheme);
+
+} // ! STEP
+} // ! Assimp
+
+#endif

include/aiConfig.h

@@ -665,12 +665,37 @@ enum aiComponent
 
 
 // ---------------------------------------------------------------------------
-/** Ogre Importer will try to load this Materialfile
- * Ogre Mehs contain only the MaterialName, not the MaterialFile. If there 
+/** @brief Ogre Importer will try to load this Materialfile.
+ *
+ * Ogre Meshes contain only the MaterialName, not the MaterialFile. If there 
  * is no material file with the same name as the material, Ogre Importer will 
  * try to load this file and search the material in it.
+ * <br>
+ * Property type: String. Default value: guessed.
  */
 #define AI_CONFIG_IMPORT_OGRE_MATERIAL_FILE "IMPORT_OGRE_MATERIAL_FILE"
 
 
+// ---------------------------------------------------------------------------
+/** @brief Specfies whether the IFC loader will skip over IfcSpace elements.
+ *
+ * IfcSpace elements (and their geometric representations) are used to
+ * represent, well, free space in a building storey.<br>
+ * Property type: Bool. Default value: true.
+ */
+#define AI_CONFIG_IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS "IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS"
+
+
+// ---------------------------------------------------------------------------
+/** @brief Specfies whether the IFC loader will skip over 
+ *    shape representations of type 'Curve2D'.
+ *
+ * A lot of files contain both a faceted mesh representation and a outline
+ * with a presentation type of 'Curve2D'. Currently Assimp doesn't convert those,
+ * so turning this option off just clutters the log with errors.<br>
+ * Property type: Bool. Default value: true.
+ */
+#define AI_CONFIG_IMPORT_IFC_SKIP_CURVE_REPRESENTATIONS "IMPORT_IFC_SKIP_CURVE_REPRESENTATIONS"
+
+
 #endif // !! AI_CONFIG_H_INC

scripts/IFCImporter/CppGenerator.py

@@ -0,0 +1,281 @@
+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+# ---------------------------------------------------------------------------
+
+"""Generate the C++ glue code needed to map EXPRESS to C++"""
+
+import sys, os, re
+
+input_template_h = 'IFCReaderGen.h.template'
+input_template_cpp = 'IFCReaderGen.cpp.template'
+
+output_file_h = os.path.join('..','..','code','IFCReaderGen.h')
+output_file_cpp = os.path.join('..','..','code','IFCReaderGen.cpp')
+
+template_entity_predef = '\tstruct {entity};\n'
+template_entity_predef_ni = '\ttypedef NotImplemented {entity}; // (not currently used by Assimp)\n'
+template_entity = r"""
+
+    // C++ wrapper for {entity}
+    struct {entity} : {parent} ObjectHelper<{entity},{argcnt}> {{
+{fields}
+    }};"""
+
+template_entity_ni = ''
+
+template_type = r"""
+    // C++ wrapper type for {type}
+    typedef {real_type} {type};"""
+
+template_stub_decl = '\tDECL_CONV_STUB({type});\n'
+template_schema = '\t\tSchemaEntry("{normalized_name}",&STEP::ObjectHelper<{type},{argcnt}>::Construct )\n'
+template_schema_type = '\t\tSchemaEntry("{normalized_name}",NULL )\n'
+template_converter = r"""
+// -----------------------------------------------------------------------------------------------------------
+template <> size_t GenericFill<{type}>(const DB& db, const LIST& params, {type}* in)
+{{
+{contents}
+}}"""
+
+template_converter_prologue_a = '\tsize_t base = GenericFill(db,params,static_cast<{parent}*>(in));\n'
+template_converter_prologue_b = '\tsize_t base = 0;\n'
+template_converter_check_argcnt = '\tif (params.GetSize() < {max_arg}) {{ throw STEP::TypeError("expected {max_arg} arguments to {name}"); }}'
+template_converter_code_per_field = r"""    do {{ // convert the '{fieldname}' argument
+        const DataType* arg = params[base++];{handle_unset}{convert}
+    }} while(0);
+"""
+template_allow_optional = r"""
+        if (dynamic_cast<const UNSET*>(&*arg)) break;"""
+template_allow_derived = r"""
+        if (dynamic_cast<const ISDERIVED*>(&*arg)) {{ in->ObjectHelper<Assimp::IFC::{type},{argcnt}>::aux_is_derived[{argnum}]=true; break; }}"""        
+template_convert_single = r"""
+        try {{ GenericConvert( in->{name}, *arg, db ); break; }} 
+        catch (const TypeError& t) {{ throw TypeError(t.what() + std::string(" - expected argument {argnum} to {classname} to be a `{full_type}`")); }}"""
+
+template_converter_ommitted = '// this data structure is not used yet, so there is no code generated to fill its members\n'
+template_converter_epilogue = '\treturn base;'
+
+import ExpressReader
+
+
+def get_list_bounds(collection_spec):
+    start,end = [(int(n) if n!='?' else 0) for n in re.findall(r'(\d+|\?)',collection_spec)]
+    return start,end
+
+def get_cpp_type(field,schema):
+    isobjref = field.type in schema.entities
+    base = field.type
+    if isobjref:
+        base = 'Lazy< '+(base if base in schema.whitelist else 'NotImplemented')+' >'
+    if field.collection:
+        start,end = get_list_bounds(field.collection)
+        base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
+    if not isobjref:
+        base += '::Out'
+    if field.optional:
+        base = 'Maybe< '+base+' >'
+        
+    return base
+
+def generate_fields(entity,schema):
+    fields = []
+    for e in entity.members:
+        fields.append('\t\t{type} {name};'.format(type=get_cpp_type(e,schema),name=e.name))
+    return '\n'.join(fields)
+
+def handle_unset_args(field,entity,schema,argnum):
+    n = ''
+    # if someone derives from this class, check for derived fields.
+    if any(entity.name==e.parent for e in schema.entities.values()):
+        n += template_allow_derived.format(type=entity.name,argcnt=len(entity.members),argnum=argnum)
+    
+    if not field.optional:
+        return n+''
+    return n+template_allow_optional.format()
+
+def get_single_conversion(field,schema,argnum=0,classname='?'):
+    typen = field.type
+    name = field.name
+    if field.collection:
+        typen = 'LIST'
+    return template_convert_single.format(type=typen,name=name,argnum=argnum,classname=classname,full_type=field.fullspec)
+
+def count_args_up(entity,schema):
+    return len(entity.members) + (count_args_up(schema.entities[entity.parent],schema) if entity.parent else 0)
+
+def resolve_base_type(base,schema):
+    if base in ('INTEGER','REAL','STRING','ENUMERATION','BOOLEAN','NUMBER', 'SELECT','LOGICAL'):
+        return base
+    if base in schema.types:
+        return resolve_base_type(schema.types[base].equals,schema)
+    print(base)
+    return None
+    
+def gen_type_struct(typen,schema):
+    base = resolve_base_type(typen.equals,schema)
+    if not base:
+        return ''
+
+    if typen.aggregate:
+        start,end = get_list_bounds(typen.aggregate)
+        base = 'ListOf< {0}, {1}, {2} >'.format(base,start,end)
+    
+    return template_type.format(type=typen.name,real_type=base)
+
+def gen_converter(entity,schema):
+    max_arg = count_args_up(entity,schema)
+    arg_idx = arg_idx_ofs = max_arg - len(entity.members)
+    
+    code = template_converter_prologue_a.format(parent=entity.parent) if entity.parent else template_converter_prologue_b
+    if entity.name in schema.blacklist_partial:
+        return code+template_converter_ommitted+template_converter_epilogue;
+        
+    code +=template_converter_check_argcnt.format(max_arg=max_arg,name=entity.name)
+    for field in entity.members:
+        code += template_converter_code_per_field.format(fieldname=field.name,
+            handle_unset=handle_unset_args(field,entity,schema,arg_idx-arg_idx_ofs),
+            convert=get_single_conversion(field,schema,arg_idx,entity.name))
+
+        arg_idx += 1
+    return code+template_converter_epilogue
+
+def get_base_classes(e,schema):
+    def addit(e,out):
+        if e.parent:
+            out.append(e.parent)
+            addit(schema.entities[e.parent],out)
+    res = []
+    addit(e,res)
+    return list(reversed(res))
+
+def get_derived(e,schema):
+    def get_deriv(e,out): # bit slow, but doesn't matter here
+        s = [ee for ee in schema.entities.values() if ee.parent == e.name]
+        for sel in s:
+            out.append(sel.name)
+            get_deriv(sel,out)
+    res = []
+    get_deriv(e,res)
+    return res
+
+def get_hierarchy(e,schema):
+    return get_derived(e.schema)+[e.name]+get_base_classes(e,schema)
+
+def sort_entity_list(schema):
+    deps = []
+    entities = schema.entities
+    for e in entities.values():
+        deps += get_base_classes(e,schema)+[e.name]
+
+    checked = [] 
+    for e in deps: 
+        if e not in checked: 
+            checked.append(e)
+    return [entities[e] for e in checked]
+    
+def work(filename):
+    schema = ExpressReader.read(filename,silent=True)
+    entities, stub_decls, schema_table, converters, typedefs, predefs = '','',[],'','',''
+
+    
+    whitelist = []
+    with open('entitylist.txt', 'rt') as inp:
+        whitelist = [n.strip() for n in inp.read().split('\n') if n[:1]!='#' and n.strip()]
+
+    schema.whitelist = set()
+    schema.blacklist_partial = set()
+    for ename in whitelist:
+        try:
+            e = schema.entities[ename]
+        except KeyError:
+            # type, not entity
+            continue
+        for base in [e.name]+get_base_classes(e,schema):
+            schema.whitelist.add(base)
+        for base in get_derived(e,schema):
+            schema.blacklist_partial.add(base)
+
+    schema.blacklist_partial -= schema.whitelist
+    schema.whitelist |= schema.blacklist_partial
+
+    # uncomment this to disable automatic code reduction based on whitelisting all used entities
+    # (blacklisted entities are those who are in the whitelist and may be instanced, but will
+    # only be accessed through a pointer to a base-class.
+    #schema.whitelist = set(schema.entities.keys())
+    #schema.blacklist_partial = set()
+
+    for ntype in schema.types.values():
+        typedefs += gen_type_struct(ntype,schema)
+        schema_table.append(template_schema_type.format(normalized_name=ntype.name.lower()))
+
+    sorted_entities = sort_entity_list(schema)
+    for entity in sorted_entities:
+        parent = entity.parent+',' if entity.parent else ''
+
+        if entity.name in schema.whitelist:
+            converters += template_converter.format(type=entity.name,contents=gen_converter(entity,schema))
+            schema_table.append(template_schema.format(type=entity.name,normalized_name=entity.name.lower(),argcnt=len(entity.members)))
+            entities += template_entity.format(entity=entity.name,argcnt=len(entity.members),parent=parent,fields=generate_fields(entity,schema))
+            predefs += template_entity_predef.format(entity=entity.name)
+            stub_decls += template_stub_decl.format(type=entity.name)
+        else:
+            entities += template_entity_ni.format(entity=entity.name)
+            predefs += template_entity_predef_ni.format(entity=entity.name)
+            schema_table.append(template_schema.format(type="NotImplemented",normalized_name=entity.name.lower(),argcnt=0))
+
+    schema_table = ','.join(schema_table)
+
+    with open(input_template_h,'rt') as inp:
+        with open(output_file_h,'wt') as outp:
+            # can't use format() here since the C++ code templates contain single, unescaped curly brackets
+            outp.write(inp.read().replace('{predefs}',predefs).replace('{types}',typedefs).replace('{entities}',entities).replace('{converter-decl}',stub_decls))
+    
+    with open(input_template_cpp,'rt') as inp:
+        with open(output_file_cpp,'wt') as outp:
+            outp.write(inp.read().replace('{schema-static-table}',schema_table).replace('{converter-impl}',converters))
+
+if __name__ == "__main__":
+    sys.exit(work(sys.argv[1] if len(sys.argv)>1 else 'schema.exp'))
+
+
+
+    
+    

scripts/IFCImporter/ExpressReader.py

@@ -0,0 +1,120 @@
+#!/usr/bin/env python3
+# -*- Coding: UTF-8 -*-
+
+# ---------------------------------------------------------------------------
+# Open Asset Import Library (ASSIMP)
+# ---------------------------------------------------------------------------
+#
+# Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+# ---------------------------------------------------------------------------
+
+"""Parse an EXPRESS file and extract basic information on all
+entities and data types contained"""
+
+import sys, os, re
+
+re_match_entity = re.compile(r"""
+ENTITY\s+(\w+)\s*                                    # 'ENTITY foo'
+.*?                                                  #  skip SUPERTYPE-of
+(?:SUBTYPE\s+OF\s+\((\w+)\))?;                       # 'SUBTYPE OF (bar);' or simply ';'
+(.*?)                                                # 'a : atype;' (0 or more lines like this)
+(?:(?:INVERSE|UNIQUE|WHERE)\s*$.*?)?                 #  skip the INVERSE, UNIQUE, WHERE clauses and everything behind 
+END_ENTITY;                                          
+""",re.VERBOSE|re.DOTALL|re.MULTILINE) 
+
+re_match_type = re.compile(r"""
+TYPE\s+(\w+?)\s*=\s*((?:LIST|SET)\s*\[\d+:[\d?]+\]\s*OF)?(?:\s*UNIQUE)?\s*(\w+)   # TYPE foo = LIST[1:2] of blub
+(?:(?<=ENUMERATION)\s*OF\s*\((.*?)\))?
+.*?                                                                 #  skip the WHERE clause
+END_TYPE;
+""",re.VERBOSE|re.DOTALL)
+
+re_match_field = re.compile(r"""
+\s+(\w+?)\s*:\s*(OPTIONAL)?\s*((?:LIST|SET)\s*\[\d+:[\d?]+\]\s*OF)?(?:\s*UNIQUE)?\s*(\w+?);
+""",re.VERBOSE|re.DOTALL)
+
+
+class Schema:
+    def __init__(self):
+        self.entities = {}
+        self.types = {}
+
+class Entity:
+    def __init__(self,name,parent,members):
+        self.name = name
+        self.parent = parent
+        self.members = members
+
+class Field:
+    def __init__(self,name,type,optional,collection):
+        self.name = name
+        self.type = type
+        self.optional = optional
+        self.collection = collection
+        self.fullspec = (self.collection+' ' if self.collection else '') + self.type 
+
+class Type:
+    def __init__(self,name,aggregate,equals,enums):
+        self.name = name
+        self.aggregate = aggregate
+        self.equals = equals
+        self.enums = enums
+        
+
+def read(filename,silent=False):
+    schema = Schema()
+    with open(filename,'rt') as inp: 
+        contents = inp.read()
+        types = re.findall(re_match_type,contents)
+        for name,aggregate,equals,enums in types:
+            schema.types[name] = Type(name,aggregate,equals,enums)
+            
+        entities = re.findall(re_match_entity,contents)
+        for name,parent,fields_raw in entities:
+            print('process entity {0}, parent is {1}'.format(name,parent)) if not silent else None
+            fields = re.findall(re_match_field,fields_raw)
+            members = [Field(name,type,opt,coll) for name, opt, coll, type in fields]
+            print('  got {0} fields'.format(len(members))) if not silent else None
+            
+            schema.entities[name] = Entity(name,parent,members)
+    return schema
+
+if __name__ == "__main__":
+    sys.exit(read(sys.argv[1] if len(sys.argv)>1 else 'schema.exp'))
+
+
+
+
+    

scripts/IFCImporter/IFCReaderGen.cpp.template

@@ -0,0 +1,79 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+
+----------------------------------------------------------------------
+*/
+
+/** MACHINE-GENERATED by scripts/ICFImporter/CppGenerator.py */
+
+#include "AssimpPCH.h"
+#ifndef ASSIMP_BUILD_NO_IFC_IMPORTER
+
+#include "IFCReaderGen.h"
+
+namespace Assimp {
+using namespace IFC;
+
+namespace {
+
+	typedef EXPRESS::ConversionSchema::SchemaEntry SchemaEntry;
+	const SchemaEntry schema_raw[] =  {
+{schema-static-table}
+	};
+}
+
+// -----------------------------------------------------------------------------------------------------------
+void IFC::GetSchema(EXPRESS::ConversionSchema& out)
+{
+	out = EXPRESS::ConversionSchema(schema_raw);
+}
+
+namespace STEP {
+
+// -----------------------------------------------------------------------------------------------------------
+template <> size_t GenericFill<NotImplemented>(const STEP::DB& db, const LIST& params, NotImplemented* in)
+{
+	return 0;
+}
+
+
+{converter-impl}
+
+} // ! STEP
+} // ! Assimp
+
+#endif

scripts/IFCImporter/IFCReaderGen.h.template

@@ -0,0 +1,91 @@
+/*
+Open Asset Import Library (ASSIMP)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2010, ASSIMP Development 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 Development 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.
+
+----------------------------------------------------------------------
+*/
+
+/** MACHINE-GENERATED by scripts/ICFImporter/CppGenerator.py */
+
+#ifndef INCLUDED_IFC_READER_GEN_H
+#define INCLUDED_IFC_READER_GEN_H
+
+#include "STEPFile.h"
+
+namespace Assimp {
+namespace IFC {
+	using namespace STEP;
+	using namespace STEP::EXPRESS;
+	
+	
+	struct NotImplemented : public ObjectHelper<NotImplemented,0> {
+		
+	};
+	
+
+	// ******************************************************************************
+	// IFC Custom data types
+	// ******************************************************************************
+
+{types}
+
+
+	// ******************************************************************************
+	// IFC Entities
+	// ******************************************************************************
+
+{predefs}
+{entities}
+
+	void GetSchema(EXPRESS::ConversionSchema& out);
+
+} //! IFC
+namespace STEP {
+
+	// ******************************************************************************
+	// Converter stubs
+	// ******************************************************************************
+	
+#define DECL_CONV_STUB(type) template <> size_t GenericFill<IFC::type>(const STEP::DB& db, const EXPRESS::LIST& params, IFC::type* in)
+	
+{converter-decl}
+
+#undef DECL_CONV_STUB
+
+} //! STEP
+} //! Assimp
+
+#endif // INCLUDED_IFC_READER_GEN_H

scripts/IFCImporter/entitylist.txt

@@ -0,0 +1,184 @@
+# ============================================================================== 
+# List of IFC structures needed by Assimp
+# ============================================================================== 
+# use genentitylist.sh to update this list
+
+# This machine-generated list is not complete, it lacks many intermediate 
+# classes in the inheritance hierarchy. Those are magically augmented by the
+# code generator. Also, the names of all used entities need to be present 
+# in the source code for this to work.
+
+IfcRepresentationMap
+IfcProductRepresentation
+IfcUnitAssignment
+IfcClosedShell
+IfcDoor
+IfcProject
+IfcRepresentationItem
+IfcAxis2Placement
+IfcProduct
+IfcProject
+IfcSIUnit
+IfcColourRgb
+IfcColourOrFactor
+IfcColourRgb
+IfcCartesianPoint
+IfcDirection
+IfcAxis2Placement3D
+IfcAxis2Placement2D
+IfcAxis2Placement
+IfcAxis2Placement3D
+IfcAxis2Placement2D
+IfcRepresentationContext
+IfcGeometricRepresentationContext
+IfcCartesianTransformationOperator
+IfcCartesianTransformationOperator3D
+IfcPolyLoop
+IfcCartesianPoint
+IfcConnectedFaceSet
+IfcFace
+IfcFaceBound
+IfcPolyLoop
+IfcPolyline
+IfcCartesianPoint
+IfcArbitraryClosedProfileDef
+IfcPolyline
+IfcArbitraryOpenProfileDef
+IfcPolyline
+IfcParameterizedProfileDef
+IfcRectangleProfileDef
+IfcExtrudedAreaSolid
+IfcArbitraryClosedProfileDef
+IfcArbitraryOpenProfileDef
+IfcParameterizedProfileDef
+IfcSweptAreaSolid
+IfcExtrudedAreaSolid
+IfcBooleanResult
+IfcBooleanClippingResult
+IfcBooleanResult
+IfcSweptAreaSolid
+IfcRepresentationItem
+IfcStyledItem
+IfcPresentationStyleAssignment
+IfcPresentationStyleSelect
+IfcSurfaceStyle
+IfcSurfaceStyleElementSelect
+IfcSurfaceStyleShading
+IfcSurfaceStyleRendering
+IfcSurfaceStyleWithTextures
+IfcTopologicalRepresentationItem
+IfcConnectedFaceSet
+IfcGeometricRepresentationItem
+IfcShellBasedSurfaceModel
+IfcShell
+IfcConnectedFaceSet
+IfcSweptAreaSolid
+IfcManifoldSolidBrep
+IfcBooleanResult
+IfcRepresentationItem
+IfcTopologicalRepresentationItem
+IfcGeometricRepresentationItem
+IfcObjectPlacement
+IfcLocalPlacement
+IfcMappedItem
+IfcRepresentation
+IfcRepresentationItem
+IfcProduct
+IfcSpace
+IfcRepresentation
+IfcRepresentationItem
+IfcMappedItem
+IfcProduct
+IfcRelContainedInSpatialStructure
+IfcProduct
+IfcRelAggregates
+IfcObjectDefinition
+IfcProduct
+IfcSpatialStructureElement
+IfcRelAggregates
+IfcObjectDefinition
+IfcProject
+IfcRepresentationItem
+IfcAxis2Placement
+IfcProduct
+IfcProject
+IfcSIUnit
+IfcColourRgb
+IfcColourOrFactor
+IfcColourRgb
+IfcCartesianPoint
+IfcDirection
+IfcAxis2Placement3D
+IfcAxis2Placement2D
+IfcAxis2Placement
+IfcAxis2Placement3D
+IfcAxis2Placement2D
+IfcRepresentationContext
+IfcGeometricRepresentationContext
+IfcCartesianTransformationOperator
+IfcCartesianTransformationOperator3D
+IfcPolyLoop
+IfcCartesianPoint
+IfcConnectedFaceSet
+IfcFace
+IfcFaceBound
+IfcPolyLoop
+IfcPolyline
+IfcCartesianPoint
+IfcArbitraryClosedProfileDef
+IfcPolyline
+IfcArbitraryOpenProfileDef
+IfcPolyline
+IfcParameterizedProfileDef
+IfcRectangleProfileDef
+IfcExtrudedAreaSolid
+IfcArbitraryClosedProfileDef
+IfcArbitraryOpenProfileDef
+IfcParameterizedProfileDef
+IfcSweptAreaSolid
+IfcExtrudedAreaSolid
+IfcBooleanResult
+IfcBooleanClippingResult
+IfcBooleanResult
+IfcSweptAreaSolid
+IfcRepresentationItem
+IfcStyledItem
+IfcPresentationStyleAssignment
+IfcPresentationStyleSelect
+IfcSurfaceStyle
+IfcSurfaceStyleElementSelect
+IfcSurfaceStyleShading
+IfcSurfaceStyleRendering
+IfcSurfaceStyleWithTextures
+IfcTopologicalRepresentationItem
+IfcConnectedFaceSet
+IfcGeometricRepresentationItem
+IfcShellBasedSurfaceModel
+IfcShell
+IfcConnectedFaceSet
+IfcSweptAreaSolid
+IfcManifoldSolidBrep
+IfcBooleanResult
+IfcRepresentationItem
+IfcTopologicalRepresentationItem
+IfcGeometricRepresentationItem
+IfcObjectPlacement
+IfcLocalPlacement
+IfcMappedItem
+IfcRepresentation
+IfcRepresentationItem
+IfcProduct
+IfcSpace
+IfcRepresentation
+IfcRepresentationItem
+IfcMappedItem
+IfcProduct
+IfcRelContainedInSpatialStructure
+IfcProduct
+IfcRelAggregates
+IfcObjectDefinition
+IfcProduct
+IfcSpatialStructureElement
+IfcRelAggregates
+IfcObjectDefinition
+

scripts/IFCImporter/genentitylist.sh

@@ -0,0 +1,2 @@
+#!/bin/sh
+grep -E 'IFC::Ifc([A-Z][a-z]*)+' -o ../../code/IFCLoader.cpp | uniq | sed s/IFC::// > output.txt

workspaces/vc9/assimp.vcproj

@@ -1942,6 +1942,46 @@
 						>
 					</File>
 				</Filter>
+				<Filter
+					Name="icf"
+					>
+					<File
+						RelativePath="..\..\code\IFCLoader.cpp"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\IFCLoader.h"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\IFCReaderGen.cpp"
+						>
+						<FileConfiguration
+							Name="debug|x64"
+							>
+							<Tool
+								Name="VCCLCompilerTool"
+								AdditionalOptions="/bigobj"
+							/>
+						</FileConfiguration>
+					</File>
+					<File
+						RelativePath="..\..\code\IFCReaderGen.h"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\STEPFile.h"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\STEPFileReader.cpp"
+						>
+					</File>
+					<File
+						RelativePath="..\..\code\STEPFileReader.h"
+						>
+					</File>
+				</Filter>
 			</Filter>
 			<Filter
 				Name="postprocessing"