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intern.cs
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using System;
using System.Collections.Generic;
using System.Linq;
namespace Python.Runtime
{
static partial class InternString
{
private static Dictionary<string, IntPtr> _string2interns;
private static Dictionary<IntPtr, string> _intern2strings;
static InternString()
{
var identifierNames = typeof(PyIdentifier).GetFields().Select(fi => fi.Name);
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()
{
_string2interns = new Dictionary<string, IntPtr>();
_intern2strings = new Dictionary<IntPtr, string>();
Type type = typeof(PyIdentifier);
foreach (string name in _builtinNames)
{
IntPtr op = Runtime.PyUnicode_InternFromString(name);
SetIntern(name, op);
type.GetField(name).SetValue(null, op);
}
}
public static void Shutdown()
{
foreach (var ptr in _intern2strings.Keys)
{
Runtime.XDecref(ptr);
}
_string2interns = null;
_intern2strings = null;
}
public static string GetManagedString(IntPtr op)
{
string s;
if (TryGetInterned(op, out s))
{
return s;
}
return Runtime.GetManagedString(op);
}
public static bool TryGetInterned(IntPtr op, out string s)
{
return _intern2strings.TryGetValue(op, out s);
}
private static void SetIntern(string s, IntPtr op)
{
_string2interns.Add(s, op);
_intern2strings.Add(op, s);
}
}
}