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Commitaba6217

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allow .NET classes to override __getattr__ and __setattr__
1 parenta8a9426 commitaba6217

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6 files changed

+137
-14
lines changed

6 files changed

+137
-14
lines changed

‎CHANGELOG.md

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Original file line numberDiff line numberDiff line change
@@ -10,6 +10,7 @@ This document follows the conventions laid out in [Keep a CHANGELOG][].
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###Added
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- Added automatic NuGet package generation in appveyor and local builds
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- Added IGetAttr and ISetAttr, so that .NET classes could override__getattr__ and__setattr__
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###Changed
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‎src/embed_tests/Python.EmbeddingTest.csproj

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@@ -89,6 +89,7 @@
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<CompileInclude="TestDomainReload.cs" />
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<CompileInclude="TestExample.cs" />
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<CompileInclude="TestFinalizer.cs" />
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<CompileInclude="TestInstanceWrapping.cs" />
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<CompileInclude="TestPyAnsiString.cs" />
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<CompileInclude="TestPyFloat.cs" />
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<CompileInclude="TestPyInt.cs" />
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,60 @@
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usingNUnit.Framework;
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usingPython.Runtime;
3+
usingPython.Runtime.Slots;
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namespacePython.EmbeddingTest{
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publicclassTestInstanceWrapping{
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[OneTimeSetUp]
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publicvoidSetUp(){
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PythonEngine.Initialize();
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}
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[OneTimeTearDown]
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publicvoidDispose(){
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PythonEngine.Shutdown();
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}
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17+
[Test]
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publicvoidGetAttrCanBeOverriden(){
19+
varoverloaded=newOverloaded();
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using(Py.GIL()){
21+
varo=overloaded.ToPython();
22+
dynamicgetNonexistingAttr=PythonEngine.Eval("lambda o: o.non_existing_attr");
23+
stringnonexistentAttrValue=getNonexistingAttr(o);
24+
Assert.AreEqual(GetAttrFallbackValue,nonexistentAttrValue);
25+
}
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}
27+
28+
[Test]
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publicvoidSetAttrCanBeOverriden(){
30+
varoverloaded=newOverloaded();
31+
using(Py.GIL())
32+
using(varscope=Py.CreateScope()){
33+
varo=overloaded.ToPython();
34+
scope.Set(nameof(o),o);
35+
scope.Exec($"{nameof(o)}.non_existing_attr = 42");
36+
Assert.AreEqual(42,overloaded.Value);
37+
}
38+
}
39+
40+
conststringGetAttrFallbackValue="undefined";
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42+
classBase{}
43+
classDerived:Base{}
44+
45+
classOverloaded:Derived,IGetAttr,ISetAttr
46+
{
47+
publicintValue{get;privateset;}
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49+
publicboolTryGetAttr(stringname,outPyObjectvalue){
50+
value=GetAttrFallbackValue.ToPython();
51+
returntrue;
52+
}
53+
54+
publicboolTrySetAttr(stringname,PyObjectvalue){
55+
this.Value=value.As<int>();
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returntrue;
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}
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}
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}
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}

‎src/runtime/Python.Runtime.csproj

Lines changed: 14 additions & 13 deletions
Original file line numberDiff line numberDiff line change
@@ -22,19 +22,19 @@
2222
</PropertyGroup>
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<!--We can relax binding to platform because code references no any platform dependent assemblies-->
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<!--This will allows to use any build of this assebly as a compile ref assebly-->
25-
<!--<PropertyGroup Condition=" '$(Platform)' == 'x86'">
26-
<PlatformTarget>x86</PlatformTarget>
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</PropertyGroup>
28-
<PropertyGroup Condition=" '$(Platform)' == 'x64'">
29-
<PlatformTarget>x64</PlatformTarget>
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<!--<PropertyGroup Condition=" '$(Platform)' == 'x86'">
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<PlatformTarget>x86</PlatformTarget>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Platform)' == 'x64'">
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<PlatformTarget>x64</PlatformTarget>
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</PropertyGroup>-->
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<PropertyGroupCondition=" '$(Configuration)' == 'ReleaseMono'">
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<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON2;PYTHON27;UCS4</DefineConstants>
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<Optimize>true</Optimize>
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<DebugType>pdbonly</DebugType>
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</PropertyGroup>
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<PropertyGroupCondition=" '$(Configuration)' == 'ReleaseMonoPY3'">
37-
<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS4</DefineConstants>
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<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS4</DefineConstants>
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<Optimize>true</Optimize>
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<DebugType>pdbonly</DebugType>
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</PropertyGroup>
@@ -46,7 +46,7 @@
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</PropertyGroup>
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<PropertyGroupCondition=" '$(Configuration)' == 'DebugMonoPY3'">
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<DebugSymbols>true</DebugSymbols>
49-
<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS4;TRACE;DEBUG</DefineConstants>
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<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS4;TRACE;DEBUG</DefineConstants>
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<Optimize>false</Optimize>
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<DebugType>full</DebugType>
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</PropertyGroup>
@@ -56,7 +56,7 @@
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<DebugType>pdbonly</DebugType>
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</PropertyGroup>
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<PropertyGroupCondition=" '$(Configuration)' == 'ReleaseWinPY3'">
59-
<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS2</DefineConstants>
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<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS2</DefineConstants>
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<Optimize>true</Optimize>
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<DebugType>pdbonly</DebugType>
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</PropertyGroup>
@@ -68,7 +68,7 @@
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</PropertyGroup>
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<PropertyGroupCondition=" '$(Configuration)' == 'DebugWinPY3'">
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<DebugSymbols>true</DebugSymbols>
71-
<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS2;TRACE;DEBUG</DefineConstants>
71+
<DefineConstantsCondition="'$(DefineConstants)' == ''">PYTHON3;PYTHON37;UCS2;TRACE;DEBUG</DefineConstants>
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<Optimize>false</Optimize>
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<DebugType>full</DebugType>
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</PropertyGroup>
@@ -137,11 +137,12 @@
137137
<CompileInclude="pythonexception.cs" />
138138
<CompileInclude="pytuple.cs" />
139139
<CompileInclude="runtime.cs" />
140+
<CompileInclude="slots.cs" />
140141
<CompileInclude="typemanager.cs" />
141142
<CompileInclude="typemethod.cs" />
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<CompileInclude="Util.cs" />
143-
<CompileInclude="platform\Types.cs" />
144-
<CompileInclude="platform\LibraryLoader.cs" />
144+
<CompileInclude="platform\Types.cs" />
145+
<CompileInclude="platform\LibraryLoader.cs" />
145146
</ItemGroup>
146147
<ItemGroupCondition=" '$(PythonInteropFile)' != ''">
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<CompileInclude="$(PythonInteropFile)" />
@@ -151,7 +152,7 @@
151152
<CompileInclude="interop34.cs" />
152153
<CompileInclude="interop35.cs" />
153154
<CompileInclude="interop36.cs" />
154-
<CompileInclude="interop37.cs" />
155+
<CompileInclude="interop37.cs" />
155156
</ItemGroup>
156157
<ItemGroup>
157158
<NoneInclude="..\pythonnet.snk" />
@@ -170,4 +171,4 @@
170171
<CopySourceFiles="$(TargetAssembly)"DestinationFolder="$(PythonBuildDir)" />
171172
<!--Copy SourceFiles="$(TargetAssemblyPdb)" Condition="Exists('$(TargetAssemblyPdb)')" DestinationFolder="$(PythonBuildDir)" /-->
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</Target>
173-
</Project>
174+
</Project>

‎src/runtime/slots.cs

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,47 @@
1+
usingSystem;
2+
3+
namespacePython.Runtime.Slots
4+
{
5+
/// <summary>
6+
/// Implement this interface to override Python's __getattr__ for your class
7+
/// </summary>
8+
publicinterfaceIGetAttr{
9+
boolTryGetAttr(stringname,outPyObjectvalue);
10+
}
11+
12+
/// <summary>
13+
/// Implement this interface to override Python's __setattr__ for your class
14+
/// </summary>
15+
publicinterfaceISetAttr{
16+
boolTrySetAttr(stringname,PyObjectvalue);
17+
}
18+
19+
staticclassSlotOverrides{
20+
publicstaticIntPtrtp_getattro(IntPtrob,IntPtrkey){
21+
IntPtrgenericResult=Runtime.PyObject_GenericGetAttr(ob,key);
22+
if(genericResult!=IntPtr.Zero||!Runtime.PyString_Check(key)){
23+
returngenericResult;
24+
}
25+
26+
Exceptions.Clear();
27+
28+
varself=(IGetAttr)((CLRObject)ManagedType.GetManagedObject(ob)).inst;
29+
stringattr=Runtime.GetManagedString(key);
30+
returnself.TryGetAttr(attr,outvarvalue)
31+
?value.Handle
32+
:Runtime.PyObject_GenericGetAttr(ob,key);
33+
}
34+
35+
publicstaticinttp_setattro(IntPtrob,IntPtrkey,IntPtrval){
36+
if(!Runtime.PyString_Check(key)){
37+
returnRuntime.PyObject_GenericSetAttr(ob,key,val);
38+
}
39+
40+
varself=(ISetAttr)((CLRObject)ManagedType.GetManagedObject(ob)).inst;
41+
stringattr=Runtime.GetManagedString(key);
42+
returnself.TrySetAttr(attr,newPyObject(val))
43+
?0
44+
:Runtime.PyObject_GenericSetAttr(ob,key,val);
45+
}
46+
}
47+
}

‎src/runtime/typemanager.cs

Lines changed: 14 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -4,10 +4,10 @@
44
usingSystem.Reflection;
55
usingSystem.Runtime.InteropServices;
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usingPython.Runtime.Platform;
7+
usingPython.Runtime.Slots;
78

89
namespacePython.Runtime
910
{
10-
1111
/// <summary>
1212
/// The TypeManager class is responsible for building binary-compatible
1313
/// Python type objects that are implemented in managed code.
@@ -155,6 +155,14 @@ internal static IntPtr CreateType(ManagedType impl, Type clrType)
155155

156156
InitializeSlots(type,impl.GetType());
157157

158+
if(typeof(IGetAttr).IsAssignableFrom(clrType)){
159+
InitializeSlot(type,TypeOffset.tp_getattro,typeof(SlotOverrides).GetMethod(nameof(SlotOverrides.tp_getattro)));
160+
}
161+
162+
if(typeof(ISetAttr).IsAssignableFrom(clrType)){
163+
InitializeSlot(type,TypeOffset.tp_setattro,typeof(SlotOverrides).GetMethod(nameof(SlotOverrides.tp_setattro)));
164+
}
165+
158166
if(base_!=IntPtr.Zero)
159167
{
160168
Marshal.WriteIntPtr(type,TypeOffset.tp_base,base_);
@@ -779,6 +787,11 @@ static void InitializeSlot(IntPtr type, IntPtr slot, string name)
779787
Marshal.WriteIntPtr(type,offset,slot);
780788
}
781789

790+
staticvoidInitializeSlot(IntPtrtype,intslotOffset,MethodInfomethod){
791+
IntPtrthunk=Interop.GetThunk(method);
792+
Marshal.WriteIntPtr(type,slotOffset,thunk);
793+
}
794+
782795
/// <summary>
783796
/// Given a newly allocated Python type object and a managed Type that
784797
/// implements it, initialize any methods defined by the Type that need

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