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pythonnet/src/runtime/Types/DynamicObjectMemberAccessor.cs at v3.2.1 · pythonnet/pythonnet · GitHub
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DynamicObjectMemberAccessor.cs
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DynamicObjectMemberAccessor.cs
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Dynamic
;
using
System
.
Linq
;
using
System
.
Linq
.
Expressions
;
using
System
.
Runtime
.
CompilerServices
;
using
Microsoft
.
CSharp
.
RuntimeBinder
;
namespace
Python
.
Runtime
;
class
DynamicObjectMemberAccessor
{
const
int
MaxCacheEntries
=
1000
;
readonly
ConcurrentLruCache
<
MemberKey
,
Func
<
object
,
object
>
>
getters
=
new
(
MaxCacheEntries
)
;
readonly
ConcurrentLruCache
<
MemberKey
,
Action
<
object
,
object
?
>
>
setters
=
new
(
MaxCacheEntries
)
;
readonly
ConcurrentLruCache
<
MemberKey
,
Func
<
object
,
bool
>
>
deleters
=
new
(
MaxCacheEntries
)
;
static
readonly
CSharpArgumentInfo
[
]
getArgumentInfo
=
{
CSharpArgumentInfo
.
Create
(
CSharpArgumentInfoFlags
.
None
,
null
)
,
}
;
static
readonly
CSharpArgumentInfo
[
]
setArgumentInfo
=
{
CSharpArgumentInfo
.
Create
(
CSharpArgumentInfoFlags
.
None
,
null
)
,
CSharpArgumentInfo
.
Create
(
CSharpArgumentInfoFlags
.
None
,
null
)
,
}
;
public
bool
TryGetMember
(
IDynamicMetaObjectProvider
obj
,
string
memberName
,
out
object
?
value
)
{
if
(
obj
is
null
)
throw
new
ArgumentNullException
(
nameof
(
obj
)
)
;
if
(
memberName
is
null
)
throw
new
ArgumentNullException
(
nameof
(
memberName
)
)
;
var
getter
=
getters
.
GetOrAdd
(
new
MemberKey
(
obj
.
GetType
(
)
,
memberName
)
,
static
key
=>
{
if
(
typeof
(
DynamicObject
)
.
IsAssignableFrom
(
key
.
Type
)
)
{
var
getBinder
=
new
GetMemberNameBinder
(
key
.
MemberName
)
;
return
obj
=>
{
if
(
(
(
DynamicObject
)
obj
)
.
TryGetMember
(
getBinder
,
out
object
?
result
)
)
{
return
result
;
}
throw
new
RuntimeBinderException
(
$
"Could not get member '
{
key
.
MemberName
}
'"
)
;
}
;
}
var
binder
=
Binder
.
GetMember
(
CSharpBinderFlags
.
None
,
key
.
MemberName
,
key
.
Type
,
getArgumentInfo
)
;
var
callSite
=
CallSite
<
Func
<
CallSite
,
IDynamicMetaObjectProvider
,
object
>
>
.
Create
(
binder
)
;
return
obj
=>
callSite
.
Target
(
callSite
,
(
IDynamicMetaObjectProvider
)
obj
)
;
}
)
;
try
{
value
=
getter
(
obj
)
;
return
true
;
}
catch
(
RuntimeBinderException
)
{
value
=
null
;
return
false
;
}
}
public
bool
TrySetMember
(
IDynamicMetaObjectProvider
obj
,
string
memberName
,
object
?
value
)
{
if
(
obj
is
null
)
throw
new
ArgumentNullException
(
nameof
(
obj
)
)
;
if
(
memberName
is
null
)
throw
new
ArgumentNullException
(
nameof
(
memberName
)
)
;
var
setter
=
setters
.
GetOrAdd
(
new
MemberKey
(
obj
.
GetType
(
)
,
memberName
)
,
static
key
=>
{
if
(
typeof
(
DynamicObject
)
.
IsAssignableFrom
(
key
.
Type
)
)
{
var
setBinder
=
new
SetMemberNameBinder
(
key
.
MemberName
)
;
return
(
obj
,
value
)
=>
{
if
(
!
(
(
DynamicObject
)
obj
)
.
TrySetMember
(
setBinder
,
value
)
)
{
throw
new
RuntimeBinderException
(
$
"Could not set member '
{
key
.
MemberName
}
'"
)
;
}
}
;
}
var
binder
=
Binder
.
SetMember
(
CSharpBinderFlags
.
None
,
key
.
MemberName
,
key
.
Type
,
setArgumentInfo
)
;
var
callSite
=
CallSite
<
Action
<
CallSite
,
IDynamicMetaObjectProvider
,
object
?
>
>
.
Create
(
binder
)
;
return
(
obj
,
value
)
=>
callSite
.
Target
(
callSite
,
(
IDynamicMetaObjectProvider
)
obj
,
value
)
;
}
)
;
try
{
setter
(
obj
,
value
)
;
return
true
;
}
catch
(
RuntimeBinderException
)
{
return
false
;
}
}
public
bool
TryDeleteMember
(
IDynamicMetaObjectProvider
obj
,
string
memberName
)
{
if
(
obj
is
null
)
throw
new
ArgumentNullException
(
nameof
(
obj
)
)
;
if
(
memberName
is
null
)
throw
new
ArgumentNullException
(
nameof
(
memberName
)
)
;
var
deleter
=
deleters
.
GetOrAdd
(
new
MemberKey
(
obj
.
GetType
(
)
,
memberName
)
,
static
key
=>
{
if
(
typeof
(
DynamicObject
)
.
IsAssignableFrom
(
key
.
Type
)
)
{
var
binder
=
new
DeleteMemberNameBinder
(
key
.
MemberName
)
;
return
obj
=>
(
(
DynamicObject
)
obj
)
.
TryDeleteMember
(
binder
)
;
}
if
(
typeof
(
ExpandoObject
)
.
IsAssignableFrom
(
key
.
Type
)
)
{
return
obj
=>
(
(
IDictionary
<
string
,
object
>
)
(
ExpandoObject
)
obj
)
.
Remove
(
key
.
MemberName
)
;
}
return
_
=>
false
;
}
)
;
try
{
return
deleter
(
obj
)
;
}
catch
(
RuntimeBinderException
)
{
return
false
;
}
}
public
IReadOnlyCollection
<
string
>
GetDynamicMemberNames
(
IDynamicMetaObjectProvider
obj
)
{
if
(
obj
is
null
)
throw
new
ArgumentNullException
(
nameof
(
obj
)
)
;
if
(
obj
is
ExpandoObject
expandoObject
)
{
return
(
(
IDictionary
<
string
,
object
>
)
expandoObject
)
.
Keys
.
ToArray
(
)
;
}
if
(
obj
is
DynamicObject
dynamicObject
)
{
return
dynamicObject
.
GetDynamicMemberNames
(
)
.
ToArray
(
)
;
}
var
metaObject
=
obj
.
GetMetaObject
(
Expression
.
Constant
(
obj
)
)
;
return
metaObject
.
GetDynamicMemberNames
(
)
.
ToArray
(
)
;
}
readonly
record
struct
MemberKey
(
Type
Type
,
string
MemberName
)
;
sealed
class
DeleteMemberNameBinder
:
DeleteMemberBinder
{
public
DeleteMemberNameBinder
(
string
name
)
:
base
(
name
,
ignoreCase
:
false
)
{
}
public
override
DynamicMetaObject
FallbackDeleteMember
(
DynamicMetaObject
target
,
DynamicMetaObject
?
errorSuggestion
)
=>
errorSuggestion
??
throw
new
RuntimeBinderException
(
$
"Could not delete member '
{
Name
}
'"
)
;
}
sealed
class
GetMemberNameBinder
:
GetMemberBinder
{
public
GetMemberNameBinder
(
string
name
)
:
base
(
name
,
ignoreCase
:
false
)
{
}
public
override
DynamicMetaObject
FallbackGetMember
(
DynamicMetaObject
target
,
DynamicMetaObject
?
errorSuggestion
)
=>
errorSuggestion
??
throw
new
RuntimeBinderException
(
$
"Could not get member '
{
Name
}
'"
)
;
}
sealed
class
SetMemberNameBinder
:
SetMemberBinder
{
public
SetMemberNameBinder
(
string
name
)
:
base
(
name
,
ignoreCase
:
false
)
{
}
public
override
DynamicMetaObject
FallbackSetMember
(
DynamicMetaObject
target
,
DynamicMetaObject
value
,
DynamicMetaObject
?
errorSuggestion
)
=>
errorSuggestion
??
throw
new
RuntimeBinderException
(
$
"Could not set member '
{
Name
}
'"
)
;
}
public
void
Clear
(
)
{
getters
.
Clear
(
)
;
setters
.
Clear
(
)
;
deleters
.
Clear
(
)
;
}
}
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