public void PromotesBinaryOperations(string input)
{
var visitor = new ExpressionFactoryVisitor();
var expr = visitor.Visit(FilterSyntaxFactory.ParseExpression(input));
Assert.NotNull(expr);
}
public void Convert(string input)
{
var visitor = new ExpressionFactoryVisitor();
var expr = visitor.Visit(FilterSyntaxFactory.ParseExpression(input));
Assert.NotNull(expr);
}
public void NoImplicitConversionToBool()
{
var syntaxNode = FilterSyntaxFactory.ParseExpression("Id & 1");
var ex = Assert.Throws <InvalidOperationException>(() => ExpressionFactoryVisitor.Convert(syntaxNode));
Assert.Contains("expression is not boolean", ex.Message, StringComparison.InvariantCultureIgnoreCase);
}
public void ForbidsIncompatibleOperands(string input)
{
var visitor = new ExpressionFactoryVisitor();
var syntaxNode = FilterSyntaxFactory.ParseExpression(input);
var ex = Assert.Throws <ArgumentException>(() => visitor.Visit(syntaxNode));
Assert.Contains("cannot compare incompatible operand types", ex.Message, StringComparison.InvariantCultureIgnoreCase);
}
public void HexLiteral()
{
var visitor = new ExpressionFactoryVisitor();
var expr = visitor.Visit(FilterSyntaxFactory.ParseExpression("Id == 0x12"));
Assert.NotNull(expr);
Assert.Equal(ExpressionType.Equal, expr.NodeType);
var binExpr = (BinaryExpression)expr;
Assert.Equal(TraceLogFilterBuilder.Instance.Id, binExpr.Left);
var valueExpr = Assert.IsType <ConstantExpression>(binExpr.Right);
Assert.Equal((ushort)0x12, valueExpr.Value);
}
public void Mask()
{
var expr = ExpressionFactoryVisitor.Convert(FilterSyntaxFactory.ParseExpression("(Id & 0x12) != 0"));
Assert.NotNull(expr);
Assert.Equal(ExpressionType.NotEqual, expr.NodeType);
var cmpExpr = (BinaryExpression)expr;
var zeroExpr = Assert.IsType <ConstantExpression>(cmpExpr.Right);
Assert.Equal((ushort)0, zeroExpr.Value);
Assert.Equal(ExpressionType.And, cmpExpr.Left.NodeType);
var andExpr = (BinaryExpression)cmpExpr.Left;
Assert.Equal(TraceLogFilterBuilder.Instance.Id, andExpr.Left);
var valueExpr = Assert.IsType <ConstantExpression>(andExpr.Right);
Assert.Equal((ushort)0x12, valueExpr.Value);
Assert.Equal(typeof(bool), expr.Type);
}
