/// <summary>
/// Backwards compatible Convert for the old sites that need to flow CodeContext
/// </summary>
public static Expression/*!*/ Convert(Expression/*!*/ codeContext, PythonContext/*!*/ binder, Type/*!*/ type, ConversionResultKind resultKind, Expression/*!*/ target) {
return Ast.Dynamic(
binder.Convert(type, resultKind),
type,
target
);
}
/// <summary>
/// Used for conversions to bool
/// </summary>
private static Expression /*!*/ GetConvertByLengthBody(PythonContext /*!*/ state, Expression /*!*/ call)
{
Assert.NotNull(state, call);
Expression callAsInt = call;
if (call.Type != typeof(int))
{
callAsInt = DynamicExpression.Dynamic(
state.Convert(typeof(int), ConversionResultKind.ExplicitCast),
typeof(int),
call
);
}
var res = Expression.Parameter(typeof(int));
return(Ast.Block(
new[] { res },
Ast.Assign(res, callAsInt),
Ast.IfThen(Ast.LessThan(res, Ast.Constant(0)),
Ast.Throw(
Ast.Call(
typeof(PythonOps).GetMethod(nameof(PythonOps.ValueError)),
Ast.Constant("__len__() should return >= 0"),
Ast.NewArrayInit(typeof(object))
)
)
),
Ast.NotEqual(res, Ast.Constant(0))
));
}
/// <summary>
/// Backwards compatible Convert for the old sites that need to flow CodeContext
/// </summary>
public static Expression /*!*/ Convert(Expression /*!*/ codeContext, PythonContext /*!*/ binder, Type /*!*/ type, ConversionResultKind resultKind, Expression /*!*/ target)
{
return(Ast.Dynamic(
binder.Convert(type, resultKind),
type,
target
));
}
/// <summary>
/// Used for conversions to bool
/// </summary>
private static Expression /*!*/ GetConvertByLengthBody(PythonContext /*!*/ state, Expression /*!*/ call)
{
Assert.NotNull(state, call);
Expression callAsInt = call;
if (call.Type != typeof(int))
{
callAsInt = DynamicExpression.Dynamic(
state.Convert(typeof(int), ConversionResultKind.ExplicitCast),
typeof(int),
call
);
}
return(Ast.NotEqual(callAsInt, AstUtils.Constant(0)));
}
private static DynamicExpression/*!*/ HashConvertToInt(PythonContext/*!*/ state, Expression/*!*/ expression) {
return DynamicExpression.Dynamic(
state.Convert(
typeof(int),
ConversionResultKind.ExplicitCast
),
typeof(int),
expression
);
}
public override DynamicMetaObject/*!*/ MakeRule(DynamicMetaObjectBinder/*!*/ metaBinder, PythonContext/*!*/ binder, DynamicMetaObject/*!*/[]/*!*/ args) {
DynamicMetaObject[] tupleArgs = Callable.GetTupleArguments(args);
return Callable.CompleteRuleTarget(metaBinder, tupleArgs, delegate() {
PythonTypeSlot indexSlot;
if (args[1].GetLimitType() != typeof(Slice) && GetTypeAt(1).TryResolveSlot(binder.SharedContext, "__index__", out indexSlot)) {
args[1] = new DynamicMetaObject(
DynamicExpression.Dynamic(
binder.Convert(
typeof(int),
ConversionResultKind.ExplicitCast
),
typeof(int),
DynamicExpression.Dynamic(
binder.InvokeNone,
typeof(object),
AstUtils.Constant(binder.SharedContext),
Binders.Get(
AstUtils.Constant(binder.SharedContext),
binder,
typeof(object),
"__index__",
args[1].Expression
)
)
),
BindingRestrictions.Empty
);
return Callable.CompleteRuleTarget(metaBinder, tupleArgs, null);
}
return null;
});
}
public override DynamicMetaObject/*!*/ MakeRule(DynamicMetaObjectBinder/*!*/ metaBinder, PythonContext/*!*/ binder, DynamicMetaObject/*!*/[]/*!*/ args) {
// the semantics of simple slicing state that if the value
// is less than 0 then the length is added to it. The default
// for unprovided parameters are 0 and maxint. The callee
// is responsible for ignoring out of range values but slicing
// is responsible for doing this initial transformation.
Debug.Assert(args.Length > 2); // index 1 and 2 should be our slice indexes, we might have another arg if we're a setter
args = ArrayUtils.Copy(args);
for (int i = 1; i < 3; i++) {
args[i] = args[i].Restrict(args[i].GetLimitType());
if (args[i].GetLimitType() == typeof(MissingParameter)) {
switch (i) {
case 1: args[i] = new DynamicMetaObject(AstUtils.Constant(0), args[i].Restrictions); break;
case 2: args[i] = new DynamicMetaObject(AstUtils.Constant(Int32.MaxValue), args[i].Restrictions); break;
}
} else if (args[i].GetLimitType() == typeof(int)) {
args[i] = MakeIntTest(args[0], args[i]);
} else if (args[i].GetLimitType().IsSubclassOf(typeof(Extensible<int>))) {
args[i] = MakeIntTest(
args[0],
new DynamicMetaObject(
Ast.Property(
args[i].Expression,
args[i].GetLimitType().GetProperty("Value")
),
args[i].Restrictions
)
);
} else if (args[i].GetLimitType() == typeof(BigInteger)) {
args[i] = MakeBigIntTest(args[0], args[i]);
} else if (args[i].GetLimitType().IsSubclassOf(typeof(Extensible<BigInteger>))) {
args[i] = MakeBigIntTest(args[0], new DynamicMetaObject(Ast.Property(args[i].Expression, args[i].GetLimitType().GetProperty("Value")), args[i].Restrictions));
} else if (args[i].GetLimitType() == typeof(bool)) {
args[i] = new DynamicMetaObject(
Ast.Condition(args[i].Expression, AstUtils.Constant(1), AstUtils.Constant(0)),
args[i].Restrictions
);
} else {
// this type defines __index__, otherwise we'd have an ItemBuilder constructing a slice
args[i] = MakeIntTest(args[0],
new DynamicMetaObject(
DynamicExpression.Dynamic(
binder.Convert(
typeof(int),
ConversionResultKind.ExplicitCast
),
typeof(int),
DynamicExpression.Dynamic(
binder.InvokeNone,
typeof(object),
AstUtils.Constant(binder.SharedContext),
Binders.Get(
AstUtils.Constant(binder.SharedContext),
binder,
typeof(object),
"__index__",
Ast.Convert(
args[i].Expression,
typeof(object)
)
)
)
),
args[i].Restrictions
)
);
}
}
if (_lengthVar != null) {
// we need the length which we should only calculate once, calculate and
// store it in a temporary. Note we only calculate the length if we'll
DynamicMetaObject res = Callable.CompleteRuleTarget(metaBinder, args, null);
return new DynamicMetaObject(
Ast.Block(
new ParameterExpression[] { _lengthVar },
Ast.Assign(_lengthVar, AstUtils.Constant(null, _lengthVar.Type)),
res.Expression
),
res.Restrictions
);
}
return Callable.CompleteRuleTarget(metaBinder, args, null);
}
/// <summary>
/// Used for conversions to bool
/// </summary>
private static Expression/*!*/ GetConvertByLengthBody(PythonContext/*!*/ state, Expression/*!*/ call) {
Assert.NotNull(state, call);
Expression callAsInt = call;
if (call.Type != typeof(int)) {
callAsInt = Ast.Dynamic(
state.Convert(typeof(int), ConversionResultKind.ExplicitCast),
typeof(int),
call
);
}
return Ast.NotEqual(callAsInt, AstUtils.Constant(0));
}
