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ClearScript/ClearScript/CustomAttributes.cs at master · r2d2m/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
.
Reflection
;
using
Microsoft
.
ClearScript
.
Util
;
namespace
Microsoft
.
ClearScript
{
internal
static
partial
class
CustomAttributes
{
private
static
readonly
object
cacheLock
=
new
object
(
)
;
public
static
T
[
]
GetOrLoad
<
T
>
(
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
lock
(
cacheLock
)
{
return
GetOrLoad
<
T
>
(
cache
.
GetOrCreateValue
(
resource
)
,
resource
,
inherit
)
;
}
}
public
static
bool
Has
<
T
>
(
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
lock
(
cacheLock
)
{
return
Has
<
T
>
(
cache
.
GetOrCreateValue
(
resource
)
,
resource
,
inherit
)
;
}
}
private
static
T
[
]
GetOrLoad
<
T
>
(
CacheEntry
entry
,
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
if
(
entry
.
TryGet
<
T
>
(
out
var
attrs
)
)
{
return
attrs
;
}
attrs
=
GetOrLoad
<
T
>
(
GetIsBypass
(
entry
,
resource
)
,
resource
,
inherit
)
;
entry
.
Add
(
attrs
)
;
return
attrs
;
}
private
static
bool
Has
<
T
>
(
CacheEntry
entry
,
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
return
GetOrLoad
<
T
>
(
entry
,
resource
,
inherit
)
.
Length
>
0
;
}
private
static
T
[
]
GetOrLoad
<
T
>
(
bool
isBypass
,
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
var
loader
=
isBypass
?
HostSettings
.
DefaultCustomAttributeLoader
:
HostSettings
.
CustomAttributeLoader
;
return
loader
.
LoadCustomAttributes
<
T
>
(
resource
,
inherit
)
??
ArrayHelpers
.
GetEmptyArray
<
T
>
(
)
;
}
private
static
bool
Has
<
T
>
(
bool
isBypass
,
ICustomAttributeProvider
resource
,
bool
inherit
)
where
T
:
Attribute
{
return
GetOrLoad
<
T
>
(
isBypass
,
resource
,
inherit
)
.
Length
>
0
;
}
private
static
bool
GetIsBypass
(
ICustomAttributeProvider
resource
)
{
// ReSharper disable once InconsistentlySynchronizedField
return
GetIsBypass
(
cache
.
GetOrCreateValue
(
resource
)
,
resource
)
;
}
private
static
bool
GetIsBypass
(
CacheEntry
entry
,
ICustomAttributeProvider
resource
)
{
if
(
!
entry
.
IsBypass
.
HasValue
)
{
entry
.
IsBypass
=
GetIsBypassInternal
(
resource
)
;
}
return
entry
.
IsBypass
.
Value
;
}
private
static
bool
GetIsBypassInternal
(
ICustomAttributeProvider
resource
)
{
if
(
Has
<
BypassCustomAttributeLoaderAttribute
>
(
true
,
resource
,
false
)
)
{
return
true
;
}
var
parent
=
GetParent
(
resource
)
;
if
(
parent
!=
null
)
{
return
GetIsBypass
(
parent
)
;
}
return
false
;
}
private
static
ICustomAttributeProvider
GetParent
(
ICustomAttributeProvider
resource
)
{
if
(
resource
is
ParameterInfo
parameter
)
{
return
parameter
.
Member
;
}
if
(
resource
is
Type
type
)
{
return
(
type
.
DeclaringType
as
ICustomAttributeProvider
)
??
type
.
Module
;
}
if
(
resource
is
MemberInfo
member
)
{
return
member
.
DeclaringType
;
}
if
(
resource
is
Module
module
)
{
return
module
.
Assembly
;
}
return
null
;
}
#region Nested type: CacheEntry
// ReSharper disable ClassNeverInstantiated.Local
private
sealed
class
CacheEntry
{
private
readonly
Dictionary
<
Type
,
object
>
map
=
new
Dictionary
<
Type
,
object
>
(
)
;
public
bool
?
IsBypass
{
get
;
set
;
}
public
void
Add
<
T
>
(
T
[
]
attrs
)
{
map
.
Add
(
typeof
(
T
)
,
attrs
)
;
}
public
bool
TryGet
<
T
>
(
out
T
[
]
attrs
)
{
if
(
map
.
TryGetValue
(
typeof
(
T
)
,
out
var
attrsObject
)
)
{
attrs
=
attrsObject
as
T
[
]
;
return
true
;
}
attrs
=
null
;
return
false
;
}
}
// ReSharper restore ClassNeverInstantiated.Local
#endregion
}
[
AttributeUsage
(
AttributeTargets
.
All
,
Inherited
=
false
)
]
internal
sealed
class
BypassCustomAttributeLoaderAttribute
:
Attribute
{
}
}
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