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Here's your Daily Digest of new issues for project "IronPython".
In today's digest:ISSUES
1. [New issue] IronPython ignores overridden TryUnaryOperation of DynamicObject
that overrides TryUnaryOperation
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ISSUES
1. [New issue] IronPython ignores overridden TryUnaryOperation of DynamicObject
that overrides TryUnaryOperation
http://ironpython.codeplex.com/workitem/33978
User Rauhotz has proposed the issue:
"IronPython (2.7.3) seems to not check the TryUnaryOperation with
ExpressionType.IsFalse and ExpressionType.IsTrue for performing short-circuit
evaluation of the logical AND and OR operations.
Here's an example that uses a class that inherits from DynamicObject. In C#, it
works perfectly, but produces a wrong result if used in an IronPython
expression. Is that behavior expected or a bug? How can i get IronPython to
behave the same way as C#?
The class:
public class Dyn : DynamicObject
{
private readonly string text;
public Dyn(string text)
{
this.text = text;
}
public override string ToString()
{
return this.text;
}
public override bool TryBinaryOperation(BinaryOperationBinder binder,
object arg, out object result)
{
result = new Dyn(this + " " + binder.Operation + " " + arg);
return true;
}
public override bool TryUnaryOperation(UnaryOperationBinder binder, out
object result)
{
switch (binder.Operation)
{
case ExpressionType.IsFalse:
case ExpressionType.IsTrue:
result = false;
return true;
}
return base.TryUnaryOperation(binder, out result);
}
}
The usage:
dynamic a = new Dyn("a");
dynamic b = new Dyn("b");
dynamic c = new Dyn("c");
var correct = a && b || c;
var engine = Python.CreateEngine();
var scope = engine.CreateScope();
scope.SetVariable("a", a);
scope.SetVariable("b", b);
scope.SetVariable("c", c);
var incorrect = engine.Execute("a and b or c", scope);
Console.WriteLine("Correct: " + correct);
Console.WriteLine("Incorrect: " + incorrect);
Prints:
Correct: a And b Or c
Incorrect: b
"
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