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runtime
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using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Diagnostics
;
using
System
.
Linq
;
using
System
.
Reflection
;
namespace
Python
.
Runtime
{
static
partial
class
InternString
{
private
static
readonly
Dictionary
<
string
,
PyString
>
_string2interns
=
new
(
)
;
private
static
readonly
Dictionary
<
IntPtr
,
string
>
_intern2strings
=
new
(
)
;
const
BindingFlags
PyIdentifierFieldFlags
=
BindingFlags
.
Static
|
BindingFlags
.
NonPublic
;
static
InternString
(
)
{
var
identifierNames
=
typeof
(
PyIdentifier
)
.
GetFields
(
PyIdentifierFieldFlags
)
.
Select
(
fi
=>
fi
.
Name
.
Substring
(
1
)
)
;
var
validNames
=
new
HashSet
<
string
>
(
identifierNames
)
;
if
(
validNames
.
Count
!=
_builtinNames
.
Length
)
{
throw
new
InvalidOperationException
(
"Identifiers args not matching"
)
;
}
foreach
(
var
name
in
_builtinNames
)
{
if
(
!
validNames
.
Contains
(
name
)
)
{
throw
new
InvalidOperationException
(
$
"
{
name
}
is not declared"
)
;
}
}
}
public
static
void
Initialize
(
)
{
Debug
.
Assert
(
_string2interns
.
Count
==
0
)
;
Type
type
=
typeof
(
PyIdentifier
)
;
foreach
(
string
name
in
_builtinNames
)
{
NewReference
pyStr
=
Runtime
.
PyUnicode_InternFromString
(
name
)
;
var
op
=
new
PyString
(
pyStr
.
StealOrThrow
(
)
)
;
Debug
.
Assert
(
name
==
op
.
As
<
string
>
(
)
)
;
SetIntern
(
name
,
op
)
;
var
field
=
type
.
GetField
(
"f"
+
name
,
PyIdentifierFieldFlags
)
!
;
field
.
SetValue
(
null
,
op
.
DangerousGetAddressOrNull
(
)
)
;
}
}
public
static
void
Shutdown
(
)
{
foreach
(
var
entry
in
_string2interns
)
{
var
field
=
typeof
(
PyIdentifier
)
.
GetField
(
"f"
+
entry
.
Value
,
PyIdentifierFieldFlags
)
!
;
entry
.
Value
.
Dispose
(
)
;
field
.
SetValue
(
null
,
IntPtr
.
Zero
)
;
}
_string2interns
.
Clear
(
)
;
_intern2strings
.
Clear
(
)
;
}
public
static
string
?
GetManagedString
(
BorrowedReference
op
)
{
if
(
TryGetInterned
(
op
,
out
string
s
)
)
{
return
s
;
}
return
Runtime
.
GetManagedString
(
op
)
;
}
public
static
bool
TryGetInterned
(
BorrowedReference
op
,
out
string
s
)
{
return
_intern2strings
.
TryGetValue
(
op
.
DangerousGetAddress
(
)
,
out
s
)
;
}
private
static
void
SetIntern
(
string
s
,
PyString
op
)
{
_string2interns
.
Add
(
s
,
op
)
;
_intern2strings
.
Add
(
op
.
Reference
.
DangerousGetAddress
(
)
,
s
)
;
}
}
}
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