evaluate PlayerNumber as a lua expression

stepmania/src/LuaManager.cpp

@@ -359,6 +359,11 @@ float LuaManager::RunExpressionF( const CString &str )
 	return result;
 }
 
+int LuaManager::RunExpressionI( const CString &str )
+{
+	return (int)RunExpressionF(str);
+}
+
 bool LuaManager::RunExpressionS( const CString &str, CString &sOut )
 {
 	if( !RunExpression( str ) )

stepmania/src/LuaManager.h

@@ -30,6 +30,7 @@ public:
 	/* Run an expression in the global environment, returning the given type. */
 	bool RunExpressionB( const CString &str );
 	float RunExpressionF( const CString &str );
+	int RunExpressionI( const CString &str );
 	bool RunExpressionS( const CString &str, CString &sOut );
 
 	/* If sStr begins with @, evaluate the rest as an expression and store the result over sStr. */

stepmania/src/ScoreDisplayCalories.cpp

@@ -27,8 +27,12 @@ void ScoreDisplayCalories::LoadFromNode( const CString& sDir, const XNode* pNode
 {
 	RollingNumbers::LoadFromNode( sDir, pNode );
 
-	bool b = pNode->GetAttrValue( "PlayerNumber", (int&)m_PlayerNumber );
+	{
+		CString sPlayerNumber;
+		bool b = pNode->GetAttrValue( "PlayerNumber", sPlayerNumber );
 		ASSERT( b );
+		m_PlayerNumber = (PlayerNumber)LUA->RunExpressionI(sPlayerNumber);
+	}
 	
 	m_sMessageOnStep = ssprintf("StepP%d",m_PlayerNumber+1);