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ClearScript/ClearScript/HostItem.NetFramework.cs at master · bobgmail/ClearScript · GitHub
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HostItem.NetFramework.cs
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using
System
;
using
System
.
Collections
;
using
System
.
Collections
.
Generic
;
using
System
.
Reflection
;
using
Microsoft
.
ClearScript
.
Util
;
namespace
Microsoft
.
ClearScript
{
internal
partial
class
HostItem
{
#region initialization
private
static
HostItem
Create
(
ScriptEngine
engine
,
HostTarget
target
,
HostItemFlags
flags
)
{
return
TargetSupportsExpandoMembers
(
target
,
flags
)
?
new
ExpandoHostItem
(
engine
,
target
,
flags
)
:
new
HostItem
(
engine
,
target
,
flags
)
;
}
#endregion
#region internal members
#region member invocation
private
object
CreateAsyncEnumerator
<
T
>
(
IEnumerable
<
T
>
enumerable
)
{
return
HostObject
.
Wrap
(
enumerable
.
GetEnumerator
(
)
.
ToScriptableAsyncEnumerator
(
Engine
)
,
typeof
(
IScriptableAsyncEnumerator
<
T
>
)
)
;
}
private
object
CreateAsyncEnumerator
(
)
{
if
(
(
Target
is
HostObject
)
||
(
Target
is
IHostVariable
)
||
(
Target
is
IByRefArg
)
)
{
if
(
(
Target
.
InvokeTarget
!=
null
)
&&
Target
.
Type
.
IsAssignableToGenericType
(
typeof
(
IEnumerable
<
>
)
,
out
var
typeArgs
)
)
{
var
helpersHostItem
=
Wrap
(
Engine
,
typeof
(
ScriptableEnumerableHelpers
<
>
)
.
MakeGenericType
(
typeArgs
)
.
InvokeMember
(
"HostType"
,
BindingFlags
.
Public
|
BindingFlags
.
Static
|
BindingFlags
.
GetField
,
null
,
null
,
null
)
,
HostItemFlags
.
PrivateAccess
)
;
if
(
MiscHelpers
.
Try
(
out
var
enumerator
,
(
)
=>
(
(
IDynamic
)
helpersHostItem
)
.
InvokeMethod
(
"GetScriptableAsyncEnumerator"
,
this
,
Engine
)
)
)
{
return
enumerator
;
}
}
else
if
(
BindSpecialTarget
(
out
IEnumerable
_
)
)
{
var
helpersHostItem
=
Wrap
(
Engine
,
ScriptableEnumerableHelpers
.
HostType
,
HostItemFlags
.
PrivateAccess
)
;
if
(
MiscHelpers
.
Try
(
out
var
enumerator
,
(
)
=>
(
(
IDynamic
)
helpersHostItem
)
.
InvokeMethod
(
"GetScriptableAsyncEnumerator"
,
this
,
Engine
)
)
)
{
return
enumerator
;
}
}
}
throw
new
NotSupportedException
(
"The object is not async-enumerable"
)
;
}
#endregion
#endregion
}
}
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