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public/movieobjects/dmeexpressionoperator.h

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+//====== Copyright <20> 1996-2004, Valve Corporation, All rights reserved. =======
+//
+// The expression operator class - scalar math calculator
+// for a good list of operators and simple functions, see:
+//   \\fileserver\user\MarcS\boxweb\aliveDistLite\v4.2.0\doc\alive\functions.txt
+// (although we'll want to implement elerp as the standard 3x^2 - 2x^3 with rescale)
+//
+//=============================================================================
+
+#ifndef DMEEXPRESSIONOPERATOR_H
+#define DMEEXPRESSIONOPERATOR_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "movieobjects/dmeoperator.h"
+#include "mathlib/expressioncalculator.h"
+
+
+//-----------------------------------------------------------------------------
+// An operator which computes the value of expressions 
+//-----------------------------------------------------------------------------
+class CDmeExpressionOperator : public CDmeOperator
+{
+	DEFINE_ELEMENT( CDmeExpressionOperator, CDmeOperator );
+
+public:
+	virtual void Operate();
+
+	virtual void GetInputAttributes ( CUtlVector< CDmAttribute * > &attrs );
+	virtual void GetOutputAttributes( CUtlVector< CDmAttribute * > &attrs );
+
+	void		SetSpewResult( bool state );
+
+protected:
+	bool Parse( const char *expr );
+
+	bool IsInputAttribute( CDmAttribute *pAttribute );
+
+	CExpressionCalculator m_calc;
+
+	CDmaVar< float > m_result;
+	CDmaString    m_expr;
+	CDmaVar< bool >  m_bSpewResult;
+};
+
+
+#endif // DMEEXPRESSIONOPERATOR_H