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Ensure that param-array matching works correctly#1304

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Merged
filmor merged 3 commits intopythonnet:masterfromfilmor:fix-params-index
Dec 10, 2020
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6 changes: 3 additions & 3 deletionssrc/runtime/methodbinder.cs
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Original file line numberDiff line numberDiff line change
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 DownExpand 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 aparams array but there are some default values we need to fill in
  2. when it's aparams 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;
}
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18 changes: 18 additions & 0 deletionssrc/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;
}
}
}
10 changes: 10 additions & 0 deletionssrc/testing/methodtest.cs
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Expand Up@@ -703,6 +703,16 @@ public static string DefaultParamsWithOverloading(int a = 5, int b = 6, int c =
{
return $"{a}{b}{c}{d}XXX";
}

public static string ParamsArrayOverloaded(int i = 1)
{
return "without params-array";
}

public static string ParamsArrayOverloaded(int i, params int[] paramsArray)
{
return "with params-array";
}
}


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9 changes: 9 additions & 0 deletionssrc/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 == ""
33 changes: 33 additions & 0 deletionssrc/tests/test_method.py
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Expand Up@@ -1188,3 +1188,36 @@ def test_keyword_arg_method_resolution():
ob = MethodArityTest()
assert ob.Foo(1, b=2) == "Arity 2"

def test_params_array_overload():
res = MethodTest.ParamsArrayOverloaded()
assert res == "without params-array"

res = MethodTest.ParamsArrayOverloaded(1)
assert res == "without params-array"

res = MethodTest.ParamsArrayOverloaded(i=1)
assert res == "without params-array"

res = MethodTest.ParamsArrayOverloaded(1, 2)
assert res == "with params-array"

res = MethodTest.ParamsArrayOverloaded(1, 2, 3)
assert res == "with params-array"

res = MethodTest.ParamsArrayOverloaded(1, paramsArray=[])
assert res == "with params-array"

res = MethodTest.ParamsArrayOverloaded(1, i=1)
assert res == "with params-array"

res = MethodTest.ParamsArrayOverloaded(1, 2, 3, i=1)
assert res == "with params-array"

# These two cases are still incorrectly failing:

# res = MethodTest.ParamsArrayOverloaded(1, 2, i=1)
# assert res == "with params-array"

# res = MethodTest.ParamsArrayOverloaded(paramsArray=[], i=1)
# assert res == "with params-array"

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