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ClearScript/ClearScript/HostItem.NetCore.cs at master · phxnsharp/ClearScript · GitHub
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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT license.
using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Diagnostics
;
using
System
.
Linq
;
using
System
.
Runtime
.
InteropServices
;
using
System
.
Runtime
.
InteropServices
.
Expando
;
using
Microsoft
.
ClearScript
.
Util
;
using
Microsoft
.
ClearScript
.
Util
.
COM
;
namespace
Microsoft
.
ClearScript
{
internal
partial
class
HostItem
{
#region initialization
private
static
HostItem
Create
(
ScriptEngine
engine
,
HostTarget
target
,
HostItemFlags
flags
)
{
return
TargetSupportsExpandoMembers
(
target
,
flags
)
?
new
DispatchExHostItem
(
engine
,
target
,
flags
)
:
new
HostItem
(
engine
,
target
,
flags
)
;
}
#endregion
#region Nested type: DispatchExHostItem
private
sealed
class
DispatchExHostItem
:
ExpandoHostItem
{
#region data
private
static
readonly
Dictionary
<
IntPtr
,
PatchEntry
>
patchMap
=
new
Dictionary
<
IntPtr
,
PatchEntry
>
(
)
;
private
readonly
List
<
Member
>
expandoMembers
=
new
List
<
Member
>
(
)
;
#endregion
#region IDispatch[Ex] delegates
private
delegate
int
RawGetIDsOfNames
(
[
In
]
IntPtr
pThis
,
[
In
]
ref
Guid
iid
,
[
In
]
[
MarshalAs
(
UnmanagedType
.
LPArray
,
ArraySubType
=
UnmanagedType
.
LPWStr
,
SizeParamIndex
=
2
)
]
string
[
]
names
,
[
In
]
uint
count
,
[
In
]
int
lcid
,
[
Out
]
[
MarshalAs
(
UnmanagedType
.
LPArray
,
SizeParamIndex
=
2
)
]
int
[
]
dispids
)
;
private
delegate
int
RawGetDispID
(
[
In
]
IntPtr
pThis
,
[
In
]
[
MarshalAs
(
UnmanagedType
.
BStr
)
]
string
name
,
[
In
]
DispatchNameFlags
flags
,
[
Out
]
out
int
dispid
)
;
private
delegate
int
RawDeleteMemberByName
(
[
In
]
IntPtr
pThis
,
[
In
]
[
MarshalAs
(
UnmanagedType
.
BStr
)
]
string
name
,
[
In
]
DispatchNameFlags
flags
)
;
private
delegate
int
RawDeleteMemberByDispID
(
[
In
]
IntPtr
pThis
,
[
In
]
int
dispid
)
;
private
delegate
int
RawGetMemberProperties
(
[
In
]
IntPtr
pThis
,
[
In
]
int
dispid
,
[
In
]
DispatchPropFlags
fetchFlags
,
[
Out
]
out
DispatchPropFlags
flags
)
;
private
delegate
int
RawGetMemberName
(
[
In
]
IntPtr
pThis
,
[
In
]
int
dispid
,
[
Out
]
[
MarshalAs
(
UnmanagedType
.
BStr
)
]
out
string
name
)
;
private
delegate
int
RawGetNextDispID
(
[
In
]
IntPtr
pThis
,
[
In
]
DispatchEnumFlags
flags
,
[
In
]
int
dispidCurrent
,
[
Out
]
out
int
dispidNext
)
;
#endregion
#region constructors
public
DispatchExHostItem
(
ScriptEngine
engine
,
HostTarget
target
,
HostItemFlags
flags
)
:
base
(
engine
,
target
,
flags
)
{
EnsurePatched
(
)
;
}
#endregion
#region internal members
private
IEnumerable
<
Member
>
ReflectMembers
{
get
{
var
members
=
ThisReflect
.
GetMembers
(
GetCommonBindFlags
(
)
)
;
if
(
members
.
Length
>
0
)
{
using
(
var
unknownScope
=
Scope
.
Create
(
(
)
=>
Marshal
.
GetIUnknownForObject
(
this
)
,
pUnknown
=>
Marshal
.
Release
(
pUnknown
)
)
)
{
var
pUnknown
=
unknownScope
.
Value
;
using
(
var
dispatchScope
=
Scope
.
Create
(
(
)
=>
UnknownHelpers
.
QueryInterface
<
IDispatch
>
(
pUnknown
)
,
pDispatch
=>
Marshal
.
Release
(
pDispatch
)
)
)
{
var
pDispatch
=
dispatchScope
.
Value
;
var
getIDsOfNames
=
VTableHelpers
.
GetMethodDelegate
<
RawGetIDsOfNames
>
(
pDispatch
,
5
)
;
var
iid
=
Guid
.
Empty
;
var
names
=
new
string
[
1
]
;
var
dispids
=
new
int
[
1
]
;
for
(
var
index
=
0
;
index
<
members
.
Length
;
index
++
)
{
names
[
0
]
=
members
[
index
]
.
Name
;
if
(
HResult
.
Succeeded
(
getIDsOfNames
(
pDispatch
,
ref
iid
,
names
,
1
,
0
,
dispids
)
)
)
{
yield
return
new
Member
{
Name
=
names
[
0
]
,
DispID
=
dispids
[
0
]
,
DispIDName
=
MiscHelpers
.
GetDispIDName
(
dispids
[
0
]
)
}
;
}
}
}
}
}
}
}
private
IExpando
ThisExpando
{
get
{
return
this
;
}
}
private
void
EnsurePatched
(
)
{
using
(
var
unknownScope
=
Scope
.
Create
(
(
)
=>
Marshal
.
GetIUnknownForObject
(
this
)
,
pUnknown
=>
Marshal
.
Release
(
pUnknown
)
)
)
{
var
pUnknown
=
unknownScope
.
Value
;
using
(
var
dispatchExScope
=
Scope
.
Create
(
(
)
=>
UnknownHelpers
.
QueryInterface
<
IDispatchEx
>
(
pUnknown
)
,
pDispatchEx
=>
Marshal
.
Release
(
pDispatchEx
)
)
)
{
lock
(
VTablePatcher
.
PatchLock
)
{
var
pDispatchEx
=
dispatchExScope
.
Value
;
var
pVTable
=
Marshal
.
ReadIntPtr
(
pDispatchEx
)
;
if
(
!
patchMap
.
ContainsKey
(
pVTable
)
)
{
var
entry
=
new
PatchEntry
(
)
;
var
origGetDispID
=
VTableHelpers
.
GetMethodDelegate
<
RawGetDispID
>
(
pDispatchEx
,
7
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
7
,
new
RawGetDispID
(
(
IntPtr
pThis
,
string
name
,
DispatchNameFlags
nameFlags
,
out
int
dispid
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
return
(
item
!=
null
)
?
item
.
GetDispID
(
name
,
nameFlags
,
out
dispid
)
:
origGetDispID
(
pThis
,
name
,
nameFlags
,
out
dispid
)
;
}
catch
(
Exception
exception
)
{
dispid
=
SpecialDispIDs
.
Unknown
;
return
exception
.
HResult
;
}
}
)
)
)
;
var
origDeleteMemberByName
=
VTableHelpers
.
GetMethodDelegate
<
RawDeleteMemberByName
>
(
pDispatchEx
,
9
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
9
,
new
RawDeleteMemberByName
(
(
pThis
,
name
,
nameFlags
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
return
(
item
!=
null
)
?
item
.
DeleteMemberByName
(
name
,
nameFlags
)
:
origDeleteMemberByName
(
pThis
,
name
,
nameFlags
)
;
}
catch
(
Exception
exception
)
{
return
exception
.
HResult
;
}
}
)
)
)
;
var
origDeleteMemberByDispID
=
VTableHelpers
.
GetMethodDelegate
<
RawDeleteMemberByDispID
>
(
pDispatchEx
,
10
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
10
,
new
RawDeleteMemberByDispID
(
(
pThis
,
dispid
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
return
(
item
!=
null
)
?
item
.
DeleteMemberByDispID
(
dispid
)
:
origDeleteMemberByDispID
(
pThis
,
dispid
)
;
}
catch
(
Exception
exception
)
{
return
exception
.
HResult
;
}
}
)
)
)
;
var
origGetMemberProperties
=
VTableHelpers
.
GetMethodDelegate
<
RawGetMemberProperties
>
(
pDispatchEx
,
11
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
11
,
new
RawGetMemberProperties
(
(
IntPtr
pThis
,
int
dispid
,
DispatchPropFlags
fetchFlags
,
out
DispatchPropFlags
propFlags
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
if
(
item
==
null
)
{
return
origGetMemberProperties
(
pThis
,
dispid
,
fetchFlags
,
out
propFlags
)
;
}
var
result
=
item
.
GetMemberProperties
(
dispid
,
fetchFlags
,
out
propFlags
)
;
if
(
result
==
HResult
.
DISP_E_MEMBERNOTFOUND
)
{
return
origGetMemberProperties
(
pThis
,
dispid
,
fetchFlags
,
out
propFlags
)
;
}
return
result
;
}
catch
(
Exception
exception
)
{
propFlags
=
0
;
return
exception
.
HResult
;
}
}
)
)
)
;
var
origGetMemberName
=
VTableHelpers
.
GetMethodDelegate
<
RawGetMemberName
>
(
pDispatchEx
,
12
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
12
,
new
RawGetMemberName
(
(
IntPtr
pThis
,
int
dispid
,
out
string
name
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
return
(
item
!=
null
)
?
item
.
GetMemberName
(
dispid
,
out
name
)
:
origGetMemberName
(
pThis
,
dispid
,
out
name
)
;
}
catch
(
Exception
exception
)
{
name
=
null
;
return
exception
.
HResult
;
}
}
)
)
)
;
var
origGetNextDispID
=
VTableHelpers
.
GetMethodDelegate
<
RawGetNextDispID
>
(
pDispatchEx
,
13
)
;
entry
.
AddDelegate
(
VTableHelpers
.
SetMethodDelegate
(
pDispatchEx
,
13
,
new
RawGetNextDispID
(
(
IntPtr
pThis
,
DispatchEnumFlags
enumFlags
,
int
dispidCurrent
,
out
int
dispidNext
)
=>
{
try
{
var
item
=
Marshal
.
GetObjectForIUnknown
(
pThis
)
as
DispatchExHostItem
;
return
(
item
!=
null
)
?
item
.
GetNextDispID
(
dispidCurrent
,
out
dispidNext
)
:
origGetNextDispID
(
pThis
,
enumFlags
,
dispidCurrent
,
out
dispidNext
)
;
}
catch
(
Exception
exception
)
{
dispidNext
=
SpecialDispIDs
.
Unknown
;
return
exception
.
HResult
;
}
}
)
)
)
;
patchMap
.
Add
(
pVTable
,
entry
)
;
Debug
.
Assert
(
patchMap
.
Count
<
16
)
;
}
}
}
}
}
#endregion
#region HostItem overrides
protected
override
string
AdjustInvokeName
(
string
name
)
{
var
member
=
expandoMembers
.
FirstOrDefault
(
expandoMember
=>
name
==
expandoMember
.
DispIDName
)
;
if
(
!
member
.
IsDefault
)
{
return
member
.
Name
;
}
return
name
;
}
protected
override
void
AddExpandoMemberName
(
string
name
)
{
var
dispid
=
1
;
var
dispids
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
Select
(
member
=>
member
.
DispID
)
.
ToArray
(
)
;
for
(
;
dispids
.
Contains
(
dispid
)
;
dispid
++
)
{
if
(
dispid
>=
int
.
MaxValue
)
{
throw
new
NotSupportedException
(
"The object cannot support additional dynamic members"
)
;
}
}
base
.
AddExpandoMemberName
(
name
)
;
expandoMembers
.
Add
(
new
Member
{
Name
=
name
,
DispID
=
dispid
,
DispIDName
=
MiscHelpers
.
GetDispIDName
(
dispid
)
}
)
;
}
protected
override
void
RemoveExpandoMemberName
(
string
name
)
{
base
.
RemoveExpandoMemberName
(
name
)
;
var
index
=
expandoMembers
.
FindIndex
(
member
=>
member
.
Name
==
name
)
;
if
(
index
>=
0
)
{
expandoMembers
.
RemoveAt
(
index
)
;
}
}
#endregion
#region IDispatchEx patches
private
int
GetDispID
(
string
name
,
DispatchNameFlags
nameFlags
,
out
int
dispid
)
{
var
nameComparison
=
nameFlags
.
HasFlag
(
DispatchNameFlags
.
CaseInsensitive
)
?
StringComparison
.
OrdinalIgnoreCase
:
StringComparison
.
Ordinal
;
var
member
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
FirstOrDefault
(
testMember
=>
string
.
Equals
(
testMember
.
Name
,
name
,
nameComparison
)
)
;
if
(
!
member
.
IsDefault
)
{
dispid
=
member
.
DispID
;
return
HResult
.
S_OK
;
}
if
(
nameFlags
.
HasFlag
(
DispatchNameFlags
.
Ensure
)
)
{
ThisExpando
.
AddProperty
(
name
)
;
return
GetDispID
(
name
,
nameFlags
&
~
DispatchNameFlags
.
Ensure
,
out
dispid
)
;
}
dispid
=
SpecialDispIDs
.
Unknown
;
return
HResult
.
DISP_E_UNKNOWNNAME
;
}
private
int
DeleteMemberByName
(
string
name
,
DispatchNameFlags
nameFlags
)
{
var
nameComparison
=
nameFlags
.
HasFlag
(
DispatchNameFlags
.
CaseInsensitive
)
?
StringComparison
.
OrdinalIgnoreCase
:
StringComparison
.
Ordinal
;
var
member
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
FirstOrDefault
(
testMember
=>
string
.
Equals
(
testMember
.
Name
,
name
,
nameComparison
)
)
;
if
(
!
member
.
IsDefault
&&
RemoveMember
(
member
.
Name
)
)
{
return
HResult
.
S_OK
;
}
// IDispatchEx specifies S_FALSE, but DISP_E_UNKNOWNNAME provides parity with .NET Framework CCWs
return
HResult
.
DISP_E_UNKNOWNNAME
;
}
private
int
DeleteMemberByDispID
(
int
dispid
)
{
var
member
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
FirstOrDefault
(
testMember
=>
testMember
.
DispID
==
dispid
)
;
if
(
!
member
.
IsDefault
&&
RemoveMember
(
member
.
Name
)
)
{
return
HResult
.
S_OK
;
}
// IDispatchEx specifies S_FALSE, but DISP_E_UNKNOWNNAME provides parity with .NET Framework CCWs
return
HResult
.
DISP_E_UNKNOWNNAME
;
}
private
int
GetMemberProperties
(
int
dispid
,
DispatchPropFlags
fetchFlags
,
out
DispatchPropFlags
propFlags
)
{
var
member
=
expandoMembers
.
FirstOrDefault
(
testMember
=>
testMember
.
DispID
==
dispid
)
;
if
(
!
member
.
IsDefault
)
{
propFlags
=
DispatchPropFlags
.
CanGet
|
DispatchPropFlags
.
CanPut
|
DispatchPropFlags
.
CannotPutRef
|
DispatchPropFlags
.
CannotCall
|
DispatchPropFlags
.
CannotConstruct
|
DispatchPropFlags
.
CannotSourceEvents
;
propFlags
=
propFlags
&
fetchFlags
;
return
HResult
.
S_OK
;
}
propFlags
=
0
;
return
HResult
.
DISP_E_MEMBERNOTFOUND
;
}
private
int
GetMemberName
(
int
dispid
,
out
string
name
)
{
var
member
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
OrderBy
(
testMember
=>
testMember
.
DispID
)
.
FirstOrDefault
(
testMember
=>
testMember
.
DispID
==
dispid
)
;
if
(
!
member
.
IsDefault
)
{
name
=
member
.
Name
;
return
HResult
.
S_OK
;
}
name
=
null
;
return
HResult
.
S_FALSE
;
}
private
int
GetNextDispID
(
int
dispidCurrent
,
out
int
dispidNext
)
{
var
member
=
ReflectMembers
.
Concat
(
expandoMembers
)
.
OrderBy
(
testMember
=>
testMember
.
DispID
)
.
FirstOrDefault
(
testMember
=>
testMember
.
DispID
>
dispidCurrent
)
;
if
(
!
member
.
IsDefault
)
{
dispidNext
=
member
.
DispID
;
return
HResult
.
S_OK
;
}
dispidNext
=
SpecialDispIDs
.
Default
;
return
HResult
.
S_FALSE
;
}
#endregion
#region Nested type: PatchEntry
private
sealed
class
PatchEntry
{
// ReSharper disable once CollectionNeverQueried.Local
private
readonly
List
<
Delegate
>
delegates
=
new
List
<
Delegate
>
(
)
;
public
void
AddDelegate
(
Delegate
del
)
{
delegates
.
Add
(
del
)
;
}
}
#endregion
#region Nested type: Member
private
struct
Member
{
public
string
Name
;
public
int
DispID
;
public
string
DispIDName
;
public
bool
IsDefault
{
get
{
return
DispID
==
SpecialDispIDs
.
Default
;
}
}
}
#endregion
}
#endregion
}
}
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