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Merged
merged 3 commits into from
Dec 10, 2020
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Ensure that param-array matching works correctly #1304

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001aeec
Ensure that param-array matching works correctly
filmor Dec 3, 2020
b9538b9
Add tests for method matching in presence of param arrays
filmor Dec 4, 2020
f866764
Add comment to the commented out tests
filmor Dec 10, 2020
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Ensure that param-array matching works correctly 
We can match n Python parameters to exactly n+1 C# parameters of which
the last one is a param-array.

Fixes #1302.
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@filmor
filmor committed Dec 10, 2020
commit 001aeec433744d98ed4d1a02e0b6667ef425c414
6 changes: 3 additions & 3 deletions src/runtime/methodbinder.cs
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Expand Up @@ -512,7 +512,7 @@ static object[] TryConvertArguments(ParameterInfo[] pi, bool paramsArray,
{
if(arrayStart == paramIndex)
{
op = HandleParamsArray(args, arrayStart, pyArgCount, out isNewReference);
op = HandleParamsArray(args, arrayStart, pyArgCount, out isNewReference);
}
else
{
Expand Down Expand Up @@ -652,7 +652,7 @@ static bool MatchesArgumentCount(int positionalArgumentCount, ParameterInfo[] pa
{
match = true;
}
else if (positionalArgumentCount < parameters.Length)
else if (positionalArgumentCount < parameters.Length && (!paramsArray || positionalArgumentCount == parameters.Length - 1))
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Maybe it would be useful to comment explicitly on what kind of cases would fall into this condition, or simplify the branching statements somehow (refactor the default arg logic in a separate method)? Just by reading this I'm guessing that this should take care of only the following 2 cases?

  1. when it's not a params array but there are some default values we need to fill in
  2. when it's a params array and exactly one parameter is missing

Maybe there are more?

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Nevermind, actually I get it now! I also added an extra comment and renamed the variables for readability and consistency with the others parts of methodbinder in my PR: https://github.com/pythonnet/pythonnet/pull/1324/files#diff-237dc718ad5424f5476d2ebbbc4e5164c95901bd2a4c2daaf8ca6fc9f9d3a5fbR703-R704

{
// every parameter past 'positionalArgumentCount' must have either
// a corresponding keyword argument or a default parameter
Expand All @@ -677,7 +677,7 @@ static bool MatchesArgumentCount(int positionalArgumentCount, ParameterInfo[] pa
defaultArgList.Add(parameters[v].GetDefaultValue());
defaultsNeeded++;
}
else if(!paramsArray)
else if (!paramsArray)
{
match = false;
}
Expand Down
18 changes: 18 additions & 0 deletions src/testing/constructortests.cs
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Expand Up @@ -48,4 +48,22 @@ public SubclassConstructorTest(Exception v)
value = v;
}
}

public class MultipleConstructorsTest
{
public string value;
public Type[] type;

public MultipleConstructorsTest()
{
value = "";
type = new Type[1] { null };
}

public MultipleConstructorsTest(string s, params Type[] tp)
{
value = s;
type = tp;
}
}
}
9 changes: 9 additions & 0 deletions src/tests/test_constructors.py
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Expand Up @@ -44,3 +44,12 @@ class Sub(System.Exception):
instance = Sub()
ob = SubclassConstructorTest(instance)
assert isinstance(ob.value, System.Exception)


def test_multiple_constructor():
from Python.Test import MultipleConstructorsTest
import System

# Test parameterless
ob = MultipleConstructorsTest()
assert ob.value == ""
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