IECoreBinding : repr infinity for eval

Author: ericmehl

Changes

@@ -1,6 +1,10 @@
 10.5.x.x (relative to 10.5.11.0)
 ========
 
+Fixes
+-----
+
+- IECore : Fixed bug that was causing imath vectors and colors with values of `inf` / `std::numeric_limits<float>::infinity()` to be serialised in a way that could not be evaluated with `eval()`.
 
 
 10.5.11.0 (relative to 10.5.10.0)

src/IECorePython/IECoreBinding.cpp

@@ -58,6 +58,14 @@ IECORE_POP_DEFAULT_VISIBILITY
 using namespace std;
 using namespace Imath;
 
+namespace
+{
+
+static std::string g_positiveInfString = "float( 'inf' )";
+static std::string g_negativeInfString = "-float( 'inf' )";
+
+}
+
 namespace IECorePython
 {
 
@@ -70,7 +78,18 @@ std::string repr<VEC>( VEC &x )\
 	s << "imath." << #VEC << "( ";\
 	for( unsigned i=0; i<VEC::dimensions(); i++ )\
 	{\
-		s << boost::lexical_cast<string>( x[i] );\
+		if constexpr( std::numeric_limits<VEC::BaseType>::has_infinity )\
+		{\
+			s << (\
+				x[i] == std::numeric_limits<VEC::BaseType>::infinity() ? g_positiveInfString :\
+				( x[i] == -std::numeric_limits<VEC::BaseType>::infinity() ? g_negativeInfString :\
+				boost::lexical_cast<std::string>( x[i] ) ) \
+			);\
+		}\
+		else\
+		{\
+			s << boost::lexical_cast<string>( x[i] );\
+		}\
 		if( i!=VEC::dimensions()-1 )\
 		{\
 			s << ", ";\
@@ -86,7 +105,18 @@ std::string str<VEC>( VEC &x )\
 	std::stringstream s;\
 	for( unsigned i=0; i<VEC::dimensions(); i++ )\
 	{\
-		s << boost::lexical_cast<string>( x[i] );\
+		if constexpr( std::numeric_limits<VEC::BaseType>::has_infinity )\
+		{\
+			s << (\
+				x[i] == std::numeric_limits<VEC::BaseType>::infinity() ? g_positiveInfString :\
+				( x[i] == -std::numeric_limits<VEC::BaseType>::infinity() ? g_negativeInfString :\
+				boost::lexical_cast<std::string>( x[i] ) ) \
+			);\
+		}\
+		else\
+		{\
+			s << boost::lexical_cast<string>( x[i] );\
+		}\
 		if( i!=VEC::dimensions()-1 )\
 		{\
 			s << " ";\
@@ -142,7 +172,18 @@ std::string repr<COL>( COL &x )\
 	s << "imath." << #COL << "( ";\
 	for( unsigned i=0; i<COL::dimensions(); i++ )\
 	{\
-		s << boost::lexical_cast<std::string>( x[i] );\
+		if constexpr( std::numeric_limits<COL::BaseType>::has_infinity )\
+		{\
+			s << (\
+				x[i] == std::numeric_limits<COL::BaseType>::infinity() ? g_positiveInfString :\
+				( x[i] == -std::numeric_limits<COL::BaseType>::infinity() ? g_negativeInfString :\
+				boost::lexical_cast<std::string>( x[i] ) ) \
+			);\
+		}\
+		else\
+		{\
+			s << boost::lexical_cast<string>( x[i] );\
+		}\
 		if( i!=COL::dimensions()-1 )\
 		{\
 			s << ", ";\
@@ -158,7 +199,18 @@ std::string str<COL>( COL &x )\
 	std::stringstream s;\
 	for( unsigned i=0; i<COL::dimensions(); i++ )\
 	{\
-		s << boost::lexical_cast<std::string>( x[i] );\
+		if constexpr( std::numeric_limits<COL::BaseType>::has_infinity )\
+		{\
+			s << (\
+				x[i] == std::numeric_limits<COL::BaseType>::infinity() ? g_positiveInfString :\
+				( x[i] == -std::numeric_limits<COL::BaseType>::infinity() ? g_negativeInfString :\
+				boost::lexical_cast<std::string>( x[i] ) ) \
+			);\
+		}\
+		else\
+		{\
+			s << boost::lexical_cast<string>( x[i] );\
+		}\
 		if( i!=COL::dimensions()-1 )\
 		{\
 			s << " ";\

test/IECore/ReprTest.py

@@ -60,6 +60,25 @@ def test( self ) :
 		] :
 			self.assertTrue( type( v ) is type( eval( IECore.repr( v ) ) ) )
 			self.assertEqual( v, eval( IECore.repr( v ) ) )
+	
+	def testInfinity( self ) :
+
+		for v in [
+			# Python raises "OverflowError : bad numeric conversion : positive overflow"
+			# when passing `float( "inf" )` to `V2f``
+			imath.V2d( float( "inf" ), float( "inf" ) ),
+			imath.V3f( float( "inf" ), float( "inf" ), float( "inf" ) ),
+			imath.V3d( float( "inf" ), float( "inf" ), float( "inf" ) ),
+			imath.Color3f( float( "inf" ), float( "inf" ), float( "inf" ) ),
+			imath.Color4f( float( "inf" ), float( "inf" ), float( "inf" ), float( "inf" ) ),
+		] :
+			with self.subTest( v = v ) :
+				self.assertTrue( type( v ) is type( eval( IECore.repr( v ) ) ) )
+				self.assertEqual( v, eval( IECore.repr( v ) ) )
+
+				self.assertTrue( type( -v ) is type( eval( IECore.repr( -v ) ) ) )
+				self.assertEqual( -v, eval( IECore.repr( -v ) ) )
+
 
 if __name__ == "__main__":
 	unittest.main()