internal static bool BuildConversion(MetaObjectBuilder /*!*/ metaBuilder, DynamicMetaObject /*!*/ target, Expression /*!*/ contextExpression,
Type /*!*/ toType, bool defaultFallback)
{
Expression expr = TryImplicitConversion(target, toType);
if (expr != null)
{
metaBuilder.Result = expr;
metaBuilder.AddObjectTypeRestriction(target.Value, target.Expression);
return(true);
}
if (defaultFallback)
{
metaBuilder.AddObjectTypeRestriction(target.Value, target.Expression);
metaBuilder.SetError(Methods.MakeTypeConversionError.OpCall(
contextExpression,
AstUtils.Convert(target.Expression, typeof(object)),
Ast.Constant(toType, typeof(Type))
));
return(true);
}
return(false);
}
private void BuildCall(MetaObjectBuilder /*!*/ metaBuilder, CallArguments /*!*/ args, string /*!*/ name)
{
var actualArgs = RubyOverloadResolver.NormalizeArguments(metaBuilder, args, 0, Int32.MaxValue);
if (metaBuilder.Error)
{
return;
}
metaBuilder.AddRestriction(
Ast.Equal(
Ast.Property(Ast.Convert(args.TargetExpression, typeof(Win32API)), VersionProperty),
Ast.Constant(_version)
)
);
if (_function == IntPtr.Zero)
{
metaBuilder.SetError(Ast.Throw(new Func <Exception>(UninitializedFunctionError).Method.OpCall(), typeof(object)));
return;
}
if (_signature.Length != actualArgs.Count)
{
metaBuilder.SetError(Ast.Throw(new Func <int, int, Exception>(InvalidParameterCountError).Method.OpCall(
Ast.Constant(_signature.Length), Ast.Constant(actualArgs.Count)), typeof(object)
));
return;
}
var calliArgs = new AstExpressions();
calliArgs.Add(Ast.Property(Ast.Convert(args.TargetExpression, typeof(Win32API)), FunctionProperty));
for (int i = 0; i < actualArgs.Count; i++)
{
calliArgs.Add(MarshalArgument(metaBuilder, actualArgs[i], _signature[i]));
}
metaBuilder.Result = Ast.Call(EmitCalliStub(), calliArgs);
// MRI returns 0 if void return type is given:
if (_returnType == ArgType.None)
{
metaBuilder.Result = Ast.Block(metaBuilder.Result, AstUtils.Constant(0));
}
}
internal protected override bool TryImplicitConversion(MetaObjectBuilder /*!*/ metaBuilder, CallArguments /*!*/ args)
{
object target = args.Target;
if (target == null)
{
metaBuilder.SetError(Methods.CreateTypeConversionError.OpCall(AstUtils.Constant("nil"), AstUtils.Constant(TargetTypeName)));
return(true);
}
return((metaBuilder.Result = Convert(ReturnType, args)) != null);
}
internal protected override bool TryImplicitConversion(MetaObjectBuilder /*!*/ metaBuilder, CallArguments /*!*/ args)
{
if (args.Target == null)
{
metaBuilder.SetError(Methods.CreateTypeConversionError.OpCall(AstUtils.Constant("nil"), AstUtils.Constant(TargetTypeName)));
return(true);
}
metaBuilder.Result =
ImplicitConvert(typeof(int), args) ??
ImplicitConvert(typeof(BigInteger), args);
return(metaBuilder.Result != null);
}
protected virtual void SetError(MetaObjectBuilder /*!*/ metaBuilder, CallArguments /*!*/ args, Expression /*!*/ targetClassNameConstant, Type /*!*/ resultType)
{
metaBuilder.SetError(Methods.CreateTypeConversionError.OpCall(targetClassNameConstant, AstUtils.Constant(TargetTypeName)));
}