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Reflect PR #42 KeyValuePairEnumerableObject
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using System; | ||
using System.Collections.Generic; | ||
using System.Reflection; | ||
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namespace Python.Runtime | ||
{ | ||
/// <summary> | ||
/// Implements a Python type for managed KeyValuePairEnumerable (dictionaries). | ||
/// This type is essentially the same as a ClassObject, except that it provides | ||
/// sequence semantics to support natural dictionary usage (__contains__ and __len__) | ||
/// from Python. | ||
/// </summary> | ||
internal class KeyValuePairEnumerableObject : ClassObject | ||
{ | ||
private static Dictionary<Tuple<Type, string>, MethodInfo> methodsByType = new Dictionary<Tuple<Type, string>, MethodInfo>(); | ||
private static List<string> requiredMethods = new List<string> { "Count", "ContainsKey" }; | ||
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internal static bool VerifyMethodRequirements(Type type) | ||
{ | ||
foreach (var requiredMethod in requiredMethods) | ||
{ | ||
var method = type.GetMethod(requiredMethod); | ||
if (method == null) | ||
{ | ||
method = type.GetMethod($"get_{requiredMethod}"); | ||
if (method == null) | ||
{ | ||
return false; | ||
} | ||
} | ||
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var key = Tuple.Create(type, requiredMethod); | ||
methodsByType.Add(key, method); | ||
} | ||
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return true; | ||
} | ||
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internal KeyValuePairEnumerableObject(Type tp) : base(tp) | ||
{ | ||
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} | ||
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internal override bool CanSubclass() => false; | ||
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/// <summary> | ||
/// Implements __len__ for dictionary types. | ||
/// </summary> | ||
public static int mp_length(IntPtr ob) | ||
{ | ||
var obj = (CLRObject)GetManagedObject(ob); | ||
var self = obj.inst; | ||
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var key = Tuple.Create(self.GetType(), "Count"); | ||
var methodInfo = methodsByType[key]; | ||
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return (int)methodInfo.Invoke(self, null); | ||
} | ||
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/// <summary> | ||
/// Implements __contains__ for dictionary types. | ||
/// </summary> | ||
public static int sq_contains(IntPtr ob, IntPtr v) | ||
{ | ||
var obj = (CLRObject)GetManagedObject(ob); | ||
var self = obj.inst; | ||
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var key = Tuple.Create(self.GetType(), "ContainsKey"); | ||
var methodInfo = methodsByType[key]; | ||
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var parameters = methodInfo.GetParameters(); | ||
object arg; | ||
if (!Converter.ToManaged(v, parameters[0].ParameterType, out arg, false)) | ||
{ | ||
Exceptions.SetError(Exceptions.TypeError, | ||
$"invalid parameter type for sq_contains: should be {Converter.GetTypeByAlias(v)}, found {parameters[0].ParameterType}"); | ||
} | ||
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return (bool)methodInfo.Invoke(self, new[] { arg }) ? 1 : 0; | ||
} | ||
} | ||
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public static class KeyValuePairEnumerableObjectExtension | ||
{ | ||
public static bool IsKeyValuePairEnumerable(this Type type) | ||
{ | ||
var iEnumerableType = typeof(IEnumerable<>); | ||
var keyValuePairType = typeof(KeyValuePair<,>); | ||
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var interfaces = type.GetInterfaces(); | ||
foreach (var i in interfaces) | ||
{ | ||
if (i.IsGenericType && | ||
i.GetGenericTypeDefinition() == iEnumerableType) | ||
{ | ||
var arguments = i.GetGenericArguments(); | ||
if (arguments.Length != 1) continue; | ||
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var a = arguments[0]; | ||
if (a.IsGenericType && | ||
a.GetGenericTypeDefinition() == keyValuePairType && | ||
a.GetGenericArguments().Length == 2) | ||
{ | ||
return KeyValuePairEnumerableObject.VerifyMethodRequirements(type); | ||
} | ||
} | ||
} | ||
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return false; | ||
} | ||
} | ||
} |
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using System.Collections; | ||
using System.Collections.Generic; | ||
using System.Linq; | ||
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namespace Python.Test | ||
{ | ||
/// <summary> | ||
/// Supports units tests for dictionary __contains__ and __len__ | ||
/// </summary> | ||
public class PublicDictionaryTest | ||
{ | ||
public IDictionary<string, int> items; | ||
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public PublicDictionaryTest() | ||
{ | ||
items = new int[5] { 0, 1, 2, 3, 4 } | ||
.ToDictionary(k => k.ToString(), v => v); | ||
} | ||
} | ||
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public class ProtectedDictionaryTest | ||
{ | ||
protected IDictionary<string, int> items; | ||
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public ProtectedDictionaryTest() | ||
{ | ||
items = new int[5] { 0, 1, 2, 3, 4 } | ||
.ToDictionary(k => k.ToString(), v => v); | ||
} | ||
} | ||
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public class InternalDictionaryTest | ||
{ | ||
internal IDictionary<string, int> items; | ||
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public InternalDictionaryTest() | ||
{ | ||
items = new int[5] { 0, 1, 2, 3, 4 } | ||
.ToDictionary(k => k.ToString(), v => v); | ||
} | ||
} | ||
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public class PrivateDictionaryTest | ||
{ | ||
private IDictionary<string, int> items; | ||
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public PrivateDictionaryTest() | ||
{ | ||
items = new int[5] { 0, 1, 2, 3, 4 } | ||
.ToDictionary(k => k.ToString(), v => v); | ||
} | ||
} | ||
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public class InheritedDictionaryTest : IDictionary<string, int> | ||
{ | ||
private readonly IDictionary<string, int> items; | ||
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public InheritedDictionaryTest() | ||
{ | ||
items = new int[5] { 0, 1, 2, 3, 4 } | ||
.ToDictionary(k => k.ToString(), v => v); | ||
} | ||
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public int this[string key] | ||
{ | ||
get { return items[key]; } | ||
set { items[key] = value; } | ||
} | ||
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public ICollection<string> Keys => items.Keys; | ||
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public ICollection<int> Values => items.Values; | ||
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public int Count => items.Count; | ||
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public bool IsReadOnly => false; | ||
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public void Add(string key, int value) => items.Add(key, value); | ||
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public void Add(KeyValuePair<string, int> item) => items.Add(item); | ||
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public void Clear() => items.Clear(); | ||
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public bool Contains(KeyValuePair<string, int> item) => items.Contains(item); | ||
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public bool ContainsKey(string key) => items.ContainsKey(key); | ||
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public void CopyTo(KeyValuePair<string, int>[] array, int arrayIndex) | ||
{ | ||
items.CopyTo(array, arrayIndex); | ||
} | ||
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public IEnumerator<KeyValuePair<string, int>> GetEnumerator() => items.GetEnumerator(); | ||
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public bool Remove(string key) => items.Remove(key); | ||
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public bool Remove(KeyValuePair<string, int> item) => items.Remove(item); | ||
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public bool TryGetValue(string key, out int value) => items.TryGetValue(key, out value); | ||
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); | ||
} | ||
} |
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# -*- coding: utf-8 -*- | ||
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"""Test support for managed dictionaries.""" | ||
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import Python.Test as Test | ||
import System | ||
import pytest | ||
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def test_public_dict(): | ||
"""Test public dict.""" | ||
ob = Test.PublicDictionaryTest() | ||
items = ob.items | ||
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assert len(items) == 5 | ||
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assert items['0'] == 0 | ||
assert items['4'] == 4 | ||
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items['0'] = 8 | ||
assert items['0'] == 8 | ||
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items['4'] = 9 | ||
assert items['4'] == 9 | ||
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items['-4'] = 0 | ||
assert items['-4'] == 0 | ||
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items['-1'] = 4 | ||
assert items['-1'] == 4 | ||
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def test_protected_dict(): | ||
"""Test protected dict.""" | ||
ob = Test.ProtectedDictionaryTest() | ||
items = ob.items | ||
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assert len(items) == 5 | ||
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assert items['0'] == 0 | ||
assert items['4'] == 4 | ||
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items['0'] = 8 | ||
assert items['0'] == 8 | ||
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items['4'] = 9 | ||
assert items['4'] == 9 | ||
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items['-4'] = 0 | ||
assert items['-4'] == 0 | ||
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items['-1'] = 4 | ||
assert items['-1'] == 4 | ||
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def test_internal_dict(): | ||
"""Test internal dict.""" | ||
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with pytest.raises(AttributeError): | ||
ob = Test.InternalDictionaryTest() | ||
_ = ob.items | ||
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def test_private_dict(): | ||
"""Test private dict.""" | ||
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with pytest.raises(AttributeError): | ||
ob = Test.PrivateDictionaryTest() | ||
_ = ob.items | ||
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def test_dict_contains(): | ||
"""Test dict support for __contains__.""" | ||
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ob = Test.PublicDictionaryTest() | ||
items = ob.items | ||
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assert '0' in items | ||
assert '1' in items | ||
assert '2' in items | ||
assert '3' in items | ||
assert '4' in items | ||
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assert not ('5' in items) | ||
assert not ('-1' in items) | ||
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def test_dict_abuse(): | ||
"""Test dict abuse.""" | ||
_class = Test.PublicDictionaryTest | ||
ob = Test.PublicDictionaryTest() | ||
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with pytest.raises(AttributeError): | ||
del _class.__getitem__ | ||
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with pytest.raises(AttributeError): | ||
del ob.__getitem__ | ||
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with pytest.raises(AttributeError): | ||
del _class.__setitem__ | ||
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with pytest.raises(AttributeError): | ||
del ob.__setitem__ | ||
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with pytest.raises(TypeError): | ||
Test.PublicArrayTest.__getitem__(0, 0) | ||
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with pytest.raises(TypeError): | ||
Test.PublicArrayTest.__setitem__(0, 0, 0) | ||
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with pytest.raises(TypeError): | ||
desc = Test.PublicArrayTest.__dict__['__getitem__'] | ||
desc(0, 0) | ||
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with pytest.raises(TypeError): | ||
desc = Test.PublicArrayTest.__dict__['__setitem__'] | ||
desc(0, 0, 0) | ||
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def test_InheritedDictionary(): | ||
"""Test class that inherited from IDictionary.""" | ||
items = Test.InheritedDictionaryTest() | ||
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assert len(items) == 5 | ||
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assert items['0'] == 0 | ||
assert items['4'] == 4 | ||
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items['0'] = 8 | ||
assert items['0'] == 8 | ||
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items['4'] = 9 | ||
assert items['4'] == 9 | ||
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items['-4'] = 0 | ||
assert items['-4'] == 0 | ||
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items['-1'] = 4 | ||
assert items['-1'] == 4 | ||
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def test_InheritedDictionary_contains(): | ||
"""Test dict support for __contains__ in class that inherited from IDictionary""" | ||
items = Test.InheritedDictionaryTest() | ||
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assert '0' in items | ||
assert '1' in items | ||
assert '2' in items | ||
assert '3' in items | ||
assert '4' in items | ||
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assert not ('5' in items) | ||
assert not ('-1' in items) |