Function EvaluateExpression

shadercompiler/FXAnalyzer.cpp:534–1518

}

bool EvaluateExpression( ParserState& state, ASTNode* node, Type& type, ExpressionValue& value, StateValue* stateValues )
{
	if( !node )
	{
		return false;
	}

	type.symbol = nullptr;
	switch( node->GetNodeType() )
	{
	case NT_CONSTANT:
		switch( node->GetToken()->type )
		{
		case OP_INT_CONST: {
			type.FromTokenType( OP_INT );
			ExpressionValueElement element;
			element.intValue = ParseNumber( node->GetToken()->stringValue.start, node->GetToken()->stringValue.end );
			value.push_back( element );
		}
			return true;
		case OP_BOOL_CONST: {
			type.FromTokenType( OP_INT );
			ExpressionValueElement element;
			element.intValue = node->GetToken()->intValue != 0 ? 1 : 0;
			value.push_back( element );
		}
			return true;
		case OP_FLOAT_CONST: {
			type.FromTokenType( OP_FLOAT );
			ExpressionValueElement element;
			element.floatValue = ParseFloat( node->GetToken()->stringValue.start, node->GetToken()->stringValue.end );
			value.push_back( element );
		}
			return true;
		case OP_STRING_CONST: {
			type.FromTokenType( OP_STRING );
			ExpressionValueElement element;
			element.stringValue = ParseString( node->GetToken()->stringValue );
			value.push_back( element );
		}
			return true;
		}
		return false;
	case NT_VAR_IDENTIFIER: {
		if( node->GetSymbol()->definition == nullptr )
		{
			state.ShowMessage( node->GetLocation(), EC_UNINITIALIZED_VAR, ToString( node->GetSymbol()->name ).c_str() );
			return false;
		}
		ASTNode* definition = node->GetSymbol()->definition;
		if( definition->GetChildOrNull( 1 ) == nullptr )
		{
			state.ShowMessage( definition->GetToken()->fileLocation, EC_UNINITIALIZED_VAR, ToString( definition->GetSymbol()->name ).c_str() );
			return false;
		}
		type = node->GetSymbol()->type;
		return EvaluateInitializer( state, definition->GetChildOrNull( 1 ), type, value, nullptr );
	}