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ClearScript/ClearScript/HostObject.cs at master · ehtick/ClearScript · GitHub
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using
System
;
using
System
.
Reflection
;
using
System
.
Runtime
.
InteropServices
.
ComTypes
;
using
Microsoft
.
ClearScript
.
Util
;
namespace
Microsoft
.
ClearScript
{
internal
sealed
class
HostObject
:
HostTarget
{
#region data
private
readonly
object
target
;
private
readonly
Type
type
;
private
static
readonly
MethodInfo
getNullWrapperGenericMethod
=
typeof
(
HostObject
)
.
GetMethod
(
"GetNullWrapperGeneric"
,
BindingFlags
.
NonPublic
|
BindingFlags
.
Static
)
;
#endregion
#region constructors
private
HostObject
(
object
target
,
Type
type
,
bool
isCanonicalRef
)
{
if
(
!
isCanonicalRef
)
{
target
=
CanonicalRefTable
.
GetCanonicalRef
(
target
)
;
}
if
(
type
is
null
)
{
type
=
target
.
GetType
(
)
;
}
if
(
type
.
IsUnknownCOMObject
(
)
)
{
if
(
target
is
IEnumVARIANT
enumVariant
)
{
target
=
new
ScriptableEnumeratorOnEnumVariant
(
enumVariant
)
;
type
=
typeof
(
IScriptableEnumerator
)
;
}
}
this
.
target
=
target
;
this
.
type
=
type
;
}
#endregion
#region wrappers
public
static
HostObject
Wrap
(
object
target
)
{
return
Wrap
(
target
,
null
)
;
}
public
static
HostObject
Wrap
(
object
target
,
Type
type
)
{
return
Wrap
(
target
,
type
,
false
)
;
}
public
static
HostObject
Wrap
(
object
target
,
Type
type
,
bool
isCanonicalRef
)
{
return
(
target
is
not
null
)
?
new
HostObject
(
target
,
type
,
isCanonicalRef
)
:
null
;
}
public
static
object
WrapResult
(
object
result
,
Type
type
,
bool
wrapNull
)
{
if
(
(
result
is
IScriptMarshalWrapper
)
||
(
result
is
HostTarget
)
)
{
return
result
;
}
if
(
result
is
null
)
{
return
wrapNull
?
GetNullWrapper
(
type
)
:
null
;
}
if
(
(
type
==
typeof
(
void
)
)
||
(
type
==
typeof
(
object
)
)
||
type
.
IsNullable
(
)
)
{
return
result
;
}
if
(
(
type
==
result
.
GetType
(
)
)
||
(
Type
.
GetTypeCode
(
type
)
!=
TypeCode
.
Object
)
)
{
return
result
;
}
return
Wrap
(
result
,
type
)
;
}
#endregion
#region internal members
private
static
HostObject
GetNullWrapper
(
Type
type
)
{
return
(
HostObject
)
getNullWrapperGenericMethod
.
MakeGenericMethod
(
type
)
.
Invoke
(
null
,
ArrayHelpers
.
GetEmptyArray
<
object
>
(
)
)
;
}
// ReSharper disable UnusedMember.Local
private
static
HostObject
GetNullWrapperGeneric
<
T
>
(
)
{
return
NullWrapper
<
T
>
.
Value
;
}
// ReSharper restore UnusedMember.Local
#endregion
#region Object overrides
public
override
string
ToString
(
)
{
if
(
(
target
is
ScriptItem
)
&&
(
typeof
(
ScriptItem
)
.
IsAssignableFrom
(
type
)
)
)
{
return
"ScriptItem"
;
}
var
objectName
=
target
.
GetFriendlyName
(
type
)
;
return
MiscHelpers
.
FormatInvariant
(
"HostObject:{0}"
,
objectName
)
;
}
#endregion
#region HostTarget overrides
public
override
Type
Type
=>
type
;
public
override
object
Target
=>
target
;
public
override
object
InvokeTarget
=>
target
;
public
override
object
DynamicInvokeTarget
=>
target
;
public
override
HostTargetFlags
GetFlags
(
IHostContext
context
)
{
var
flags
=
HostTargetFlags
.
AllowInstanceMembers
|
HostTargetFlags
.
AllowExtensionMethods
;
if
(
context
.
Engine
.
ExposeHostObjectStaticMembers
)
{
flags
|=
HostTargetFlags
.
AllowStaticMembers
;
}
return
flags
;
}
public
override
Invocability
GetInvocability
(
IHostContext
context
,
BindingFlags
bindFlags
,
bool
ignoreDynamic
)
{
return
type
.
GetInvocability
(
context
,
bindFlags
,
ignoreDynamic
)
;
}
#endregion
#region Nested type: NullWrapper<T>
// ReSharper disable UnusedMember.Local
private
static
class
NullWrapper
<
T
>
{
public
static
readonly
HostObject
Value
=
new
(
null
,
typeof
(
T
)
,
true
)
;
}
// ReSharper restore UnusedMember.Local
#endregion
}
}
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