Encode characters outside the valid range for IFC SPF files and escape backslashes when writing IFC files

src/ifcparse/IfcCharacterDecoder.cpp

@@ -67,6 +67,7 @@
 #define CLEAR_HEX(C)						(C &= ~(HEX(1)&HEX(2)&HEX(3)&HEX(4)&HEX(5)&HEX(6)&HEX(7)&HEX(8)))
 
 using namespace IfcParse;
+using namespace IfcWrite;
 
 void IfcCharacterDecoder::addChar(std::stringstream& s,const UChar32& ch) {
 #ifdef HAVE_ICU
@@ -296,3 +297,61 @@ std::string IfcCharacterDecoder::compatibility_charset = "";
 #else
 char IfcCharacterDecoder::substitution_character = '_';
 #endif
+
+
+IfcCharacterEncoder::IfcCharacterEncoder(const std::string& input) {
+	if ( !converter) converter = ucnv_open("utf-8", &status);
+	str = input;
+}
+
+IfcCharacterEncoder::~IfcCharacterEncoder() {
+	if ( !converter) ucnv_close(converter);
+	converter = 0;
+}
+
+IfcCharacterEncoder::operator std::string() {
+#ifdef HAVE_ICU
+	// Either 2 or 4 to uses \X2 or \X4 respectively.
+	// Currently hardcoded to 4, but \X2 might be  
+	// sufficient for nearly all purposes.
+	const int num_bytes = 4; 
+	const std::string num_bytes_str = std::string(1,num_bytes + 0x30);
+
+	std::ostringstream oss;
+	UChar32 ch;
+
+	const char* source = str.c_str();
+	const char* limit = &*str.end();
+	
+	bool in_extended = false;
+
+	while(source < limit) {
+		ch = ucnv_getNextUChar(converter, &source, limit, &status);
+		const bool within_spf_range = ch >= 0x20 && ch <= 0x7e;
+		if ( in_extended && within_spf_range ) {
+			oss << "\\X0\\";
+		} else if ( !in_extended && !within_spf_range ) {
+			oss << "\\X" << num_bytes_str << "\\";
+		}
+		if ( within_spf_range ) {
+			oss.put(ch);
+			if ( ch == '\\' ) oss.put(ch);
+		} else {
+			oss << std::hex << std::setw(num_bytes*2) << std::uppercase << std::setfill('0') << (int) ch;
+		}
+		in_extended = !within_spf_range;
+	}
+
+	if ( in_extended ) oss << "\\X0\\";
+
+	return oss.str();
+#else
+	return str;
+#endif
+}
+
+
+#ifdef HAVE_ICU
+UErrorCode IfcCharacterEncoder::status = U_ZERO_ERROR;
+UConverter* IfcCharacterEncoder::converter = 0;
+#endif

src/ifcparse/IfcCharacterDecoder.h

@@ -73,4 +73,21 @@ namespace IfcParse {
 
 }
 
+namespace IfcWrite {
+
+	class IfcCharacterEncoder {
+	private:
+#ifdef HAVE_ICU
+		static UErrorCode status;
+		static UConverter* converter;
+		std::string str;
+#endif
+	public:
+		IfcCharacterEncoder(const std::string& input);
+		~IfcCharacterEncoder();
+		operator std::string();
+	};
+
+}
+
 #endif

src/ifcparse/IfcParse.cpp

@@ -468,7 +468,7 @@ TokenArgument::operator IfcUtil::IfcSchemaEntity() const { return token.first->f
 TokenArgument::operator IfcEntities() const { throw IfcException("Argument is not a list of entities"); }
 unsigned int TokenArgument::Size() const { return 1; }
 ArgumentPtr TokenArgument::operator [] (unsigned int i) const { throw IfcException("Argument is not a list of arguments"); }
-std::string TokenArgument::toString(bool upper) const { return TokenFunc::toString(token); }
+std::string TokenArgument::toString(bool upper) const { if ( upper && TokenFunc::isString(token) ) return IfcWrite::IfcCharacterEncoder(TokenFunc::toString(token)); else return TokenFunc::toString(token); }
 bool TokenArgument::isNull() const { return TokenFunc::isOperator(token,'$'); }
 //
 // Functions for casting the EntityArgument to other types
@@ -488,10 +488,11 @@ ArgumentPtr EntityArgument::operator [] (unsigned int i) const { throw IfcExcept
 std::string EntityArgument::toString(bool upper) const { 
 	ArgumentPtr arg = entity->wrappedValue();
 	IfcParse::TokenArgument* token_arg = dynamic_cast<IfcParse::TokenArgument*>(arg);
-	std::string token_string = ( token_arg ) ? TokenFunc::toString(token_arg->token) : "";
+	std::string token_string = ( token_arg ) ? TokenFunc::toString(token_arg->token) : std::string();
 	std::string dt = Ifc2x3::Type::ToString(entity->type());
 	if ( upper ) {
 		for (std::string::iterator p = dt.begin(); p != dt.end(); ++p ) *p = toupper(*p);
+		token_string = IfcWrite::IfcCharacterEncoder(token_string);
 	}
 	return dt + "(" + token_string + ")";
 }

src/ifcparse/IfcWrite.cpp

@@ -20,6 +20,7 @@
 #include "IfcParse.h" 
 #include "IfcWrite.h"
 #include "IfcWritableEntity.h"
+#include "IfcCharacterDecoder.h"
 
 using namespace IfcWrite;
 
@@ -284,10 +285,12 @@ std::string IfcWriteIntegralArgument::toString(bool upper) const {
 	case Argument_DOUBLE:
 		ss << *(double*) data;
 		break;
-	case Argument_STRING:
-		ss << '\'' << *(std::string*) data << '\'';
-		break;
-	case Argument_VECTOR_INT:
+	case Argument_STRING: {
+		std::string d = *(std::string*) data;
+		if ( upper ) d = IfcCharacterEncoder(d);
+		ss << '\'' << d << '\'';
+		break; 
+	} case Argument_VECTOR_INT:
 		ss << "(";
 		{const std::vector<int>& v = *(std::vector<int>*) data;
 		for ( std::vector<int>::const_iterator it = v.begin(); it != v.end(); ++ it ) {
@@ -361,7 +364,7 @@ IfcSelectHelper::IfcSelectHelper(int v, Ifc2x3::Type::Enum t) {
 	IfcWriteArgument* a = new IfcWriteIntegralArgument(v);
 	this->entity = new IfcSelectHelperEntity(t,a);
 }
-IfcSelectHelper::IfcSelectHelper(float v, Ifc2x3::Type::Enum t) {
+IfcSelectHelper::IfcSelectHelper(double v, Ifc2x3::Type::Enum t) {
 	IfcWriteArgument* a = new IfcWriteIntegralArgument(v);
 	this->entity = new IfcSelectHelperEntity(t,a);
 }

src/ifcparse/IfcWrite.h

@@ -170,7 +170,7 @@ namespace IfcWrite {
 		IfcSelectHelper(const std::string& v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcText);
 		IfcSelectHelper(const char* const v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcText);
 		IfcSelectHelper(int v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcInteger);
-		IfcSelectHelper(float v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcReal);
+		IfcSelectHelper(double v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcReal);
 		IfcSelectHelper(bool v, Ifc2x3::Type::Enum t=Ifc2x3::Type::IfcBoolean);
 		bool is(Ifc2x3::Type::Enum t) const;
 		Ifc2x3::Type::Enum type() const;