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DictionaryOps.cs
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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.
using System;
using System.Collections;
using System.Collections.Generic;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using System.Text;
using Microsoft.Scripting;
using Microsoft.Scripting.Runtime;
using IronPython.Runtime.Binding;
using IronPython.Runtime.Operations;
using IronPython.Runtime.Types;
namespace IronPython.Runtime {
/// <summary>
/// Provides both helpers for implementing Python dictionaries as well
/// as providing public methods that should be exposed on all dictionary types.
///
/// Currently these are published on IDictionary<object, object>
/// </summary>
public static class DictionaryOps {
#region Dictionary Public API Surface
// Dictionary has an odd not-implemented check to support custom dictionaries and therefore
// needs a custom __eq__ / __ne__ implementation.
public static string/*!*/ __repr__(CodeContext/*!*/ context, IDictionary<object, object> self) {
List<object> infinite = PythonOps.GetAndCheckInfinite(self);
if (infinite == null) {
return "{...}";
}
int index = infinite.Count;
infinite.Add(self);
try {
StringBuilder buf = new StringBuilder();
buf.Append("{");
bool first = true;
foreach (KeyValuePair<object, object> kv in self) {
if (first) first = false;
else buf.Append(", ");
if (CustomStringDictionary.IsNullObject(kv.Key))
buf.Append("None");
else
buf.Append(PythonOps.Repr(context, kv.Key));
buf.Append(": ");
buf.Append(PythonOps.Repr(context, kv.Value));
}
buf.Append("}");
return buf.ToString();
} finally {
System.Diagnostics.Debug.Assert(index == infinite.Count - 1);
infinite.RemoveAt(index);
}
}
public static object get(PythonDictionary self, object key, object defaultValue = null) {
if (self.TryGetValueNoMissing(key, out object ret)) return ret;
return defaultValue;
}
private static PythonList ToList(IDictionary<object, object> self) {
PythonList ret = new PythonList(self.Count);
foreach (KeyValuePair<object, object> kv in self) {
ret.AddNoLock(PythonTuple.MakeTuple(kv.Key, kv.Value));
}
return ret;
}
public static object pop(PythonDictionary self, object key) {
//??? perf won't match expected Python perf
if (self.TryGetValueNoMissing(key, out object ret)) {
self.RemoveDirect(key);
return ret;
} else {
throw PythonOps.KeyError(key);
}
}
public static object pop(PythonDictionary self, object key, object defaultValue) {
//??? perf won't match expected Python perf
if (self.TryGetValueNoMissing(key, out object ret)) {
self.RemoveDirect(key);
return ret;
} else {
return defaultValue;
}
}
public static PythonTuple popitem(IDictionary<object, object> self) {
IEnumerator<KeyValuePair<object, object>> ie = self.GetEnumerator();
if (ie.MoveNext()) {
object key = ie.Current.Key;
object val = ie.Current.Value;
self.Remove(key);
return PythonTuple.MakeTuple(key, val);
}
throw PythonOps.KeyError("dictionary is empty");
}
public static object setdefault(PythonDictionary self, object key) {
return setdefault(self, key, null);
}
public static object setdefault(PythonDictionary self, object key, object defaultValue) {
if (self.TryGetValueNoMissing(key, out object ret)) return ret;
self.SetItem(key, defaultValue);
return defaultValue;
}
public static void update(CodeContext/*!*/ context, PythonDictionary/*!*/ self, object other) {
if (other is PythonDictionary pyDict) {
pyDict._storage.CopyTo(ref self._storage);
} else {
SlowUpdate(context, self, other);
}
}
private static void SlowUpdate(CodeContext/*!*/ context, PythonDictionary/*!*/ self, object other) {
if (other is MappingProxy proxy) {
update(context, self, proxy.GetDictionary(context));
} else if (other is IDictionary dict) {
IDictionaryEnumerator e = dict.GetEnumerator();
while (e.MoveNext()) {
self._storage.Add(ref self._storage, e.Key, e.Value);
}
} else if (PythonOps.TryGetBoundAttr(other, "keys", out object keysFunc)) {
// user defined dictionary
IEnumerator i = PythonOps.GetEnumerator(PythonCalls.Call(context, keysFunc));
while (i.MoveNext()) {
self._storage.Add(ref self._storage, i.Current, PythonOps.GetIndex(context, other, i.Current));
}
} else {
// list of lists (key/value pairs), list of tuples,
// tuple of tuples, etc...
IEnumerator i = PythonOps.GetEnumerator(other);
int index = 0;
while (i.MoveNext()) {
if (!AddKeyValue(self, i.Current)) {
throw PythonOps.ValueError("dictionary update sequence element #{0} has bad length; 2 is required", index);
}
index++;
}
}
}
#endregion
#region Dictionary Helper APIs
internal static bool TryGetValueVirtual(CodeContext context, PythonDictionary self, object key, ref object DefaultGetItem, out object value) {
if (self is IPythonObject sdo) {
Debug.Assert(sdo != null);
PythonType myType = sdo.PythonType;
PythonTypeSlot dts;
if (DefaultGetItem == null) {
// lazy init our cached DefaultGetItem
TypeCache.Dict.TryLookupSlot(context, "__getitem__", out dts);
bool res = dts.TryGetValue(context, self, TypeCache.Dict, out DefaultGetItem);
Debug.Assert(res);
}
// check and see if it's overridden
if (myType.TryLookupSlot(context, "__getitem__", out dts)) {
dts.TryGetValue(context, self, myType, out object ret);
if (ret != DefaultGetItem) {
// subtype of dict that has overridden __getitem__
// we need to call the user's versions, and handle
// any exceptions.
try {
value = self[key];
return true;
} catch (KeyNotFoundException) {
value = null;
return false;
}
}
}
}
value = null;
return false;
}
internal static bool AddKeyValue(PythonDictionary self, object o) {
IEnumerator i = PythonOps.GetEnumerator(o); //c.GetEnumerator();
if (i.MoveNext()) {
object key = i.Current;
if (i.MoveNext()) {
object value = i.Current;
self._storage.Add(ref self._storage, key, value);
return !i.MoveNext();
}
}
return false;
}
#endregion
}
}