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316 lines (260 loc) · 12.6 KB
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information.
#nullable enable
using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Threading;
using IronPython.Runtime;
using IronPython.Runtime.Binding;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
using Microsoft.Scripting;
using Microsoft.Scripting.Actions;
using Microsoft.Scripting.Runtime;
using Microsoft.Scripting.Utils;
[assembly: PythonModule("_functools", typeof(IronPython.Modules.FunctionTools))]
namespace IronPython.Modules {
public static class FunctionTools {
public const string __doc__ = "provides functionality for manipulating callable objects";
public static object? reduce(CodeContext/*!*/ context, SiteLocalStorage<CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>>> siteData, object? func, object? seq) {
IEnumerator i = PythonOps.GetEnumerator(seq);
if (!i.MoveNext()) {
throw PythonOps.TypeError("reduce() of empty sequence with no initial value");
}
EnsureReduceData(context, siteData);
CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>> site = siteData.Data;
object? ret = i.Current;
while (i.MoveNext()) {
ret = site.Target(site, context, func, ret, i.Current);
}
return ret;
}
public static object? reduce(CodeContext/*!*/ context, SiteLocalStorage<CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>>> siteData, object? func, object? seq, object? initializer) {
IEnumerator i = PythonOps.GetEnumerator(seq);
EnsureReduceData(context, siteData);
CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>> site = siteData.Data;
object? ret = initializer;
while (i.MoveNext()) {
ret = site.Target(site, context, func, ret, i.Current);
}
return ret;
}
private static void EnsureReduceData(CodeContext context, SiteLocalStorage<CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>>> siteData) {
if (siteData.Data == null) {
siteData.Data = CallSite<Func<CallSite, CodeContext, object?, object?, object?, object?>>.Create(
context.LanguageContext.Invoke(
new CallSignature(2)
)
);
}
}
/// <summary>
/// Returns a new callable object with the provided initial set of arguments
/// bound to it. Calling the new function then appends to the additional
/// user provided arguments.
/// </summary>
[PythonType]
public class partial : IWeakReferenceable {
private const string _defaultDoc = "partial(func, *args, **keywords) - new function with partial application\n of the given arguments and keywords.\n";
private readonly CodeContext/*!*/ _context; // code context from the caller who created us
private readonly object/*!*/ _function; // the callable function to dispatch to
private readonly object[]/*!*/ _args; // the initially provided arguments
private readonly IDictionary<object, object> _keywordArgs; // the initially provided keyword arguments or null
private CallSite<Func<CallSite, CodeContext, object, object[], IDictionary<object, object>, object>>? _dictSite; // the dictionary call site if ever called w/ keyword args
private CallSite<Func<CallSite, CodeContext, object, object[], object>>? _splatSite; // the position only call site
private PythonDictionary? _dict; // dictionary for storing extra attributes
private WeakRefTracker? _tracker; // tracker so users can use Python weak references
private string? _doc; // A custom docstring, if used
#region Constructors
/// <summary>
/// Creates a new partial object with the provided positional arguments.
/// </summary>
public partial(CodeContext/*!*/ context, object? func, [NotNull]params object[]/*!*/ args)
: this(context, func, new PythonDictionary(), args) {
}
/// <summary>
/// Creates a new partial object with the provided positional and keyword arguments.
/// </summary>
public partial(CodeContext/*!*/ context, object? func, [NotNull, ParamDictionary]IDictionary<object, object> keywords, [NotNull]params object[]/*!*/ args) {
if (!PythonOps.IsCallable(context, func)) {
throw PythonOps.TypeError("the first argument must be callable");
}
_function = func;
_keywordArgs = keywords;
_args = args;
_context = context;
}
#endregion
#region Public Python API
[SpecialName, PropertyMethod, WrapperDescriptor]
public static object Get__doc__(CodeContext context, [NotNull]partial self) {
return self._doc ?? _defaultDoc;
}
[SpecialName, PropertyMethod, WrapperDescriptor]
public static void Set__doc__([NotNull]partial self, object? value) {
self._doc = value as string;
}
/// <summary>
/// Gets the function which will be called
/// </summary>
public object func {
get {
return _function;
}
}
/// <summary>
/// Gets the initially provided positional arguments.
/// </summary>
public object args {
get {
return PythonTuple.MakeTuple(_args);
}
}
/// <summary>
/// Gets the initially provided keyword arguments or None.
/// </summary>
public object keywords {
get {
return _keywordArgs;
}
}
/// <summary>
/// Gets or sets the dictionary used for storing extra attributes on the partial object.
/// </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA2227:CollectionPropertiesShouldBeReadOnly")]
public PythonDictionary __dict__ {
get {
return EnsureDict();
}
[param: NotNull]
set {
_dict = value;
}
}
[SpecialName, PropertyMethod]
public void Delete__dict__() {
throw PythonOps.TypeError("partial's dictionary may not be deleted");
}
// This exists for subtypes because we don't yet automap DeleteMember onto __delattr__
public void __delattr__([NotNull]string name) {
if (name == "__dict__") Delete__dict__();
_dict?.Remove(name);
}
public PythonTuple __reduce__() {
return PythonTuple.MakeTuple(
DynamicHelpers.GetPythonTypeFromType(typeof(partial)),
PythonTuple.MakeTuple(func),
PythonTuple.MakeTuple(func, args, keywords),
null // TODO: what should this be?
);
}
#endregion
#region Operator methods
/// <summary>
/// Calls func with the previously provided arguments and more positional arguments.
/// </summary>
[SpecialName]
public object? Call(CodeContext/*!*/ context, [NotNull]params object[] args) {
if (_keywordArgs == null) {
EnsureSplatSite();
return _splatSite!.Target(_splatSite, context, _function, ArrayUtils.AppendRange(_args, args));
}
EnsureDictSplatSite();
return _dictSite!.Target(_dictSite, context, _function, ArrayUtils.AppendRange(_args, args), _keywordArgs);
}
/// <summary>
/// Calls func with the previously provided arguments and more positional arguments and keyword arguments.
/// </summary>
[SpecialName]
public object? Call(CodeContext/*!*/ context, [ParamDictionary, NotNull]IDictionary<object, object> dict, [NotNull]params object[] args) {
IDictionary<object, object> finalDict;
if (_keywordArgs != null) {
PythonDictionary pd = new PythonDictionary();
pd.update(context, _keywordArgs);
pd.update(context, dict);
finalDict = pd;
} else {
finalDict = dict;
}
EnsureDictSplatSite();
return _dictSite!.Target(_dictSite, context, _function, ArrayUtils.AppendRange(_args, args), finalDict);
}
/// <summary>
/// Operator method to set arbitrary members on the partial object.
/// </summary>
[SpecialName]
public void SetMemberAfter(CodeContext/*!*/ context, [NotNull]string name, object? value) {
EnsureDict();
_dict![name] = value;
}
/// <summary>
/// Operator method to get additional arbitrary members defined on the partial object.
/// </summary>
[SpecialName]
public object GetBoundMember(CodeContext/*!*/ context, [NotNull]string name) {
if (_dict != null && _dict.TryGetValue(name, out object value)) {
return value;
}
return OperationFailed.Value;
}
/// <summary>
/// Operator method to delete arbitrary members defined in the partial object.
/// </summary>
[SpecialName]
public bool DeleteMember(CodeContext/*!*/ context, [NotNull]string name) {
switch (name) {
case "__dict__":
Delete__dict__();
break;
}
if (_dict == null) return false;
return _dict.Remove(name);
}
#endregion
#region Internal implementation details
private void EnsureSplatSite() {
if (_splatSite == null) {
Interlocked.CompareExchange(
ref _splatSite,
CallSite<Func<CallSite, CodeContext, object, object[], object>>.Create(
Binders.InvokeSplat(_context.LanguageContext)
),
null
);
}
}
private void EnsureDictSplatSite() {
if (_dictSite == null) {
Interlocked.CompareExchange(
ref _dictSite,
CallSite<Func<CallSite, CodeContext, object, object[], IDictionary<object, object>, object>>.Create(
Binders.InvokeKeywords(_context.LanguageContext)
),
null
);
}
}
private PythonDictionary EnsureDict() {
if (_dict == null) {
_dict = PythonDictionary.MakeSymbolDictionary();
}
return _dict;
}
#endregion
#region IWeakReferenceable Members
WeakRefTracker? IWeakReferenceable.GetWeakRef() {
return _tracker;
}
bool IWeakReferenceable.SetWeakRef(WeakRefTracker value) {
return Interlocked.CompareExchange(ref _tracker, value, null) == null;
}
void IWeakReferenceable.SetFinalizer(WeakRefTracker value) {
_tracker = value;
}
#endregion
}
}
}