public DynamicMetaObject DoOperation(string operation, OverloadResolverFactory resolverFactory, params DynamicMetaObject[] args) {
ContractUtils.RequiresNotNull(operation, "operation");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
ContractUtils.RequiresNotNullItems(args, "args");
return MakeGeneralOperatorRule(operation, resolverFactory, args); // Then try comparison / other ExpressionType
}
public override Ast ConvertExpression(Ast expr, Type toType, ConversionResultKind kind, OverloadResolverFactory resolverFactory)
{
Type exprType = expr.Type;
Type visType = CompilerHelpers.GetVisibleType(toType);
if (typeof(IFn).IsAssignableFrom(exprType) && typeof(Delegate).IsAssignableFrom(visType))
return Ast.Call(typeof(Converter).GetMethod("ConvertToDelegate"), Ast.Convert(expr, typeof(IFn)), Expression.Constant(visType));
// Follow through on our promise to convert IEnumerable<Object> or IEnumerable to IEnumerable<T> for any T
if (toType.IsGenericType && ! toType.IsAssignableFrom(expr.Type))
{
// The following is inspired by IronPython.Runtime.Binding.Python.ConversionBinder.FallbackConvert
Type genTo = toType.GetGenericTypeDefinition();
if ( genTo == typeof(IList<>))
{
return MakeToGenericConversion(expr,toType,typeof(IList<object>),typeof(ListGenericWrapper<>));
}
else if (genTo == typeof(IDictionary<,>))
{
return MakeToGenericConversion(expr,toType,typeof(IDictionary<object,object>),typeof(DictionaryGenericWrapper<,>));
}
else if (genTo == typeof(IEnumerable<>))
{
return MakeToGenericConversion(expr, toType, typeof(IEnumerable),typeof(IEnumerableOfTWrapper<>));
}
}
return base.ConvertExpression(expr, toType, kind, resolverFactory);
}
protected override DynamicMetaObject SetBoundValue(OverloadResolverFactory factory, ActionBinder binder, Type type, DynamicMetaObject value, DynamicMetaObject instance, DynamicMetaObject errorSuggestion) {
return new DynamicMetaObject(
Expression.Condition(
Ast.Call(
typeof(PythonOps).GetMethod("SlotTrySetValue"),
((PythonOverloadResolverFactory)factory)._codeContext,
AstUtils.Constant(GetSlot(), typeof(PythonTypeSlot)),
AstUtils.Convert(
instance.Expression,
typeof(object)
),
AstUtils.Constant(DynamicHelpers.GetPythonTypeFromType(type)),
value.Expression
),
AstUtils.Convert(value.Expression, typeof(object)),
errorSuggestion != null ?
errorSuggestion.Expression :
Expression.Throw(
Expression.Call(
typeof(PythonOps).GetMethod("AttributeErrorForMissingAttribute", new Type[] { typeof(object), typeof(string) }),
instance.Expression,
Expression.Constant(Name)
),
typeof(object)
)
),
BindingRestrictions.Empty
);
}
/// <summary>
/// Creates the MetaObject for indexing directly into arrays or indexing into objects which have
/// default members. Returns null if we're not an indexing operation.
/// </summary>
public DynamicMetaObject SetIndex(OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
if (args[0].LimitType.IsArray) {
return MakeArrayIndexRule(resolverFactory, IndexType.Set, args);
}
return MakeMethodIndexRule(IndexType.Set, resolverFactory, args);
}
public override Expression ConvertExpression(Expression expr, Type toType, ConversionResultKind kind, OverloadResolverFactory resolverFactory)
{
ContractUtils.RequiresNotNull(expr, "expr");
ContractUtils.RequiresNotNull(toType, "toType");
Type exprType = expr.Type;
if (toType == typeof(object))
{
if (exprType.IsValueType())
return Utils.Convert(expr, toType);
else
return expr;
}
if (toType.IsAssignableFrom(exprType))
return expr;
Type visType = Context.Binder.PrivateBinding ? toType : CompilerHelpers.GetVisibleType(toType);
return Binders.Convert(
_context,
visType,
kind,
expr
);
}
/// <summary>
/// Provides default binding for performing a call on the specified meta objects.
/// </summary>
/// <param name="signature">The signature describing the call</param>
/// <param name="target">The meta object to be called.</param>
/// <param name="args">
/// Additional meta objects are the parameters for the call as specified by the CallSignature in the CallAction.
/// </param>
/// <param name="resolverFactory">Overload resolver factory.</param>
/// <param name="errorSuggestion">The result should the object be uncallable.</param>
/// <returns>A MetaObject representing the call or the error.</returns>
public DynamicMetaObject Call(CallSignature signature, DynamicMetaObject errorSuggestion, OverloadResolverFactory resolverFactory,ClrMethod method, DynamicMetaObject target, params DynamicMetaObject[] args)
{
ContractUtils.RequiresNotNullItems(args, "args");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
TargetInfo targetInfo = GetTargetInfo(method, target, args);
if (targetInfo != null)
{
// we're calling a well-known MethodBase
DynamicMetaObject res = MakeMetaMethodCall(signature, resolverFactory, targetInfo);
if (res.Expression.Type.IsValueType)
{
if (res.Expression.Type == Types.Void)
res = new DynamicMetaObject(
Expression.Block(Types.Object[0],
res.Expression,
Expression.Constant(null)),
res.Restrictions
);
else
res = new DynamicMetaObject(
Expression.Convert(res.Expression, typeof(object)),
res.Restrictions
);
}
return res;
}
else
{
// we can't call this object
return errorSuggestion ?? MakeCannotCallRule(target, target.GetLimitType());
}
}
public DynamicMetaObject ConvertTo(Type toType, ConversionResultKind kind, DynamicMetaObject arg, OverloadResolverFactory resolverFactory, DynamicMetaObject errorSuggestion) {
ContractUtils.RequiresNotNull(toType, "toType");
ContractUtils.RequiresNotNull(arg, "arg");
Type knownType = arg.GetLimitType();
// try all the conversions - first look for conversions against the expression type,
// these can be done w/o any additional tests. Then look for conversions against the
// restricted type.
BindingRestrictions typeRestrictions = arg.Restrictions.Merge(BindingRestrictionsHelpers.GetRuntimeTypeRestriction(arg.Expression, arg.GetLimitType()));
DynamicMetaObject res =
TryConvertToObject(toType, arg.Expression.Type, arg, typeRestrictions) ??
TryAllConversions(resolverFactory, toType, kind, arg.Expression.Type, typeRestrictions, arg) ??
TryAllConversions(resolverFactory, toType, kind, arg.GetLimitType(), typeRestrictions, arg) ??
errorSuggestion ??
MakeErrorTarget(toType, kind, typeRestrictions, arg);
if ((kind == ConversionResultKind.ExplicitTry || kind == ConversionResultKind.ImplicitTry) && toType.IsValueType) {
res = new DynamicMetaObject(
AstUtils.Convert(
res.Expression,
typeof(object)
),
res.Restrictions
);
}
return res;
}
/// <summary>
/// Checks if any conversions are available and if so builds the target for that conversion.
/// </summary>
private DynamicMetaObject TryAllConversions(OverloadResolverFactory factory, Type toType, ConversionResultKind kind, Type knownType, BindingRestrictions restrictions, DynamicMetaObject arg) {
return
TryAssignableConversion(toType, knownType, restrictions, arg) ?? // known type -> known type
TryExtensibleConversion(toType, knownType, restrictions, arg) ?? // Extensible<T> -> Extensible<T>.Value
TryUserDefinedConversion(kind, toType, knownType, restrictions, arg) ?? // op_Implicit
TryImplicitNumericConversion(toType, knownType, restrictions, arg) ?? // op_Implicit
TryNullableConversion(factory, toType, kind, knownType, restrictions, arg) ?? // null -> Nullable<T> or T -> Nullable<T>
TryNullConversion(toType, knownType, restrictions); // null -> reference type
}
/// <summary>
/// Builds a MetaObject for performing a member get. Supports all built-in .NET members, the OperatorMethod
/// GetBoundMember, and StrongBox instances.
/// </summary>
/// <param name="name">
/// The name of the member to retrieve. This name is not processed by the DefaultBinder and
/// is instead handed off to the GetMember API which can do name mangling, case insensitive lookups, etc...
/// </param>
/// <param name="target">
/// The MetaObject from which the member is retrieved.
/// </param>
/// <param name="resolverFactory">
/// Provides overload resolution and method binding for any calls which need to be performed for the GetMember.
/// </param>
/// <returns>
/// Returns a DynamicMetaObject which represents the value that will be returned when the member is accessed.
///
/// The returned DynamicMetaObject may be strongly typed to a value type which needs boxing before being
/// returned from a standard DLR GetMemberBinder. The language is responsible for performing any boxing
/// so that it has an opportunity to perform custom boxing.
/// </returns>
public DynamicMetaObject GetMember(string name, DynamicMetaObject target, OverloadResolverFactory resolverFactory) {
return GetMember(
name,
target,
resolverFactory,
false,
null
);
}
public override Ast ConvertExpression(Ast expr, Type toType, ConversionResultKind kind, OverloadResolverFactory resolverFactory)
{
Type exprType = expr.Type;
Type visType = CompilerHelpers.GetVisibleType(toType);
if (typeof(IFn).IsAssignableFrom(exprType) && typeof(Delegate).IsAssignableFrom(visType))
return Ast.Call(typeof(Converter).GetMethod("ConvertToDelegate"), Ast.Convert(expr, typeof(IFn)), Expression.Constant(visType));
return base.ConvertExpression(expr, toType, kind, resolverFactory);
}
/// <summary>
/// Builds a MetaObject for performing a member get. Supports all built-in .NET members, the OperatorMethod
/// GetBoundMember, and StrongBox instances.
/// </summary>
/// <param name="name">
/// The name of the member to retrieve. This name is not processed by the DefaultBinder and
/// is instead handed off to the GetMember API which can do name mangling, case insensitive lookups, etc...
/// </param>
/// <param name="target">
/// The MetaObject from which the member is retrieved.
/// </param>
/// <param name="value">
/// The value being assigned to the target member.
/// </param>
/// <param name="resolverFactory">
/// rovides overload resolution and method binding for any calls which need to be performed for the SetMember.
/// </param>
public DynamicMetaObject SetMember(string name, DynamicMetaObject target, DynamicMetaObject value, OverloadResolverFactory resolverFactory) {
ContractUtils.RequiresNotNull(name, "name");
ContractUtils.RequiresNotNull(target, "target");
ContractUtils.RequiresNotNull(value, "value");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
return MakeSetMemberTarget(
new SetOrDeleteMemberInfo(name, resolverFactory),
target,
value
);
}
public DynamicMetaObject DeleteMember(string name, DynamicMetaObject target, OverloadResolverFactory resolutionFactory) {
ContractUtils.RequiresNotNull(name, "name");
ContractUtils.RequiresNotNull(target, "target");
return MakeDeleteMemberTarget(
new SetOrDeleteMemberInfo(
name,
resolutionFactory
),
target.Restrict(target.GetLimitType())
);
}
/// <summary>
/// Provides default binding for performing a call on the specified meta objects.
/// </summary>
/// <param name="signature">The signature describing the call</param>
/// <param name="target">The meta object to be called.</param>
/// <param name="args">
/// Additional meta objects are the parameters for the call as specified by the CallSignature in the CallAction.
/// </param>
/// <param name="resolverFactory">Overload resolver factory.</param>
/// <returns>A MetaObject representing the call or the error.</returns>
public DynamicMetaObject Call(CallSignature signature, OverloadResolverFactory resolverFactory, DynamicMetaObject target, params DynamicMetaObject[] args) {
ContractUtils.RequiresNotNullItems(args, "args");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
TargetInfo targetInfo = GetTargetInfo(signature, target, args);
if (targetInfo != null) {
// we're calling a well-known MethodBase
return MakeMetaMethodCall(signature, resolverFactory, targetInfo);
} else {
// we can't call this object
return MakeCannotCallRule(target, target.GetLimitType());
}
}
protected override DynamicMetaObject GetBoundValue(OverloadResolverFactory factory, ActionBinder binder, Type type, DynamicMetaObject instance) {
return new DynamicMetaObject(
Ast.Call(
typeof(PythonOps).GetMethod("SlotGetValue"),
((PythonOverloadResolverFactory)factory)._codeContext,
AstUtils.Constant(GetSlot(), typeof(PythonTypeSlot)),
AstUtils.Convert(
instance.Expression,
typeof(object)
),
AstUtils.Constant(DynamicHelpers.GetPythonTypeFromType(type))
),
BindingRestrictions.Empty
);
}
/// <summary>
/// Builds a MetaObject for performing a member get. Supports all built-in .NET members, the OperatorMethod
/// GetBoundMember, and StrongBox instances.
/// </summary>
/// <param name="name">
/// The name of the member to retrieve. This name is not processed by the DefaultBinder and
/// is instead handed off to the GetMember API which can do name mangling, case insensitive lookups, etc...
/// </param>
/// <param name="target">
/// The MetaObject from which the member is retrieved.
/// </param>
/// <param name="resolverFactory">
/// An OverloadResolverFactory which can be used for performing overload resolution and method binding.
/// </param>
/// <param name="isNoThrow">
/// True if the operation should return Operation.Failed on failure, false if it
/// should return the exception produced by MakeMissingMemberError.
/// </param>
/// <param name="errorSuggestion">
/// The meta object to be used if the get results in an error.
/// </param>
public DynamicMetaObject GetMember(string name, DynamicMetaObject target, OverloadResolverFactory resolverFactory, bool isNoThrow, DynamicMetaObject errorSuggestion) {
ContractUtils.RequiresNotNull(name, "name");
ContractUtils.RequiresNotNull(target, "target");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
return MakeGetMemberTarget(
new GetMemberInfo(
name,
resolverFactory,
isNoThrow,
errorSuggestion
),
target
);
}
private DynamicMetaObject MakeMetaMethodCall(CallSignature signature, OverloadResolverFactory resolverFactory, TargetInfo targetInfo) {
BindingRestrictions restrictions = BindingRestrictions.Combine(targetInfo.Arguments).Merge(targetInfo.Restrictions);
if (targetInfo.Instance != null) {
restrictions = targetInfo.Instance.Restrictions.Merge(restrictions);
}
DynamicMetaObject[] args;
CallTypes callType;
if (targetInfo.Instance != null) {
args = ArrayUtils.Insert(targetInfo.Instance, targetInfo.Arguments);
callType = CallTypes.ImplicitInstance;
} else {
args = targetInfo.Arguments;
callType = CallTypes.None;
}
return CallMethod(resolverFactory.CreateOverloadResolver(args, signature, callType), targetInfo.Targets, restrictions);
}
public override DynamicMetaObject GetValue(OverloadResolverFactory resolverFactory, ActionBinder binder, Type type) {
if (!IsStatic || GetIndexParameters().Length > 0) {
// need to bind to a value or parameters to get the value.
return binder.ReturnMemberTracker(type, this);
}
MethodInfo getter = ResolveGetter(binder.PrivateBinding);
if (getter == null || getter.ContainsGenericParameters) {
// no usable getter
return null;
}
if (getter.IsPublic && getter.DeclaringType.IsPublic) {
return binder.MakeCallExpression(resolverFactory, getter);
}
// private binding is just a call to the getter method...
return MemberTracker.FromMemberInfo(getter).Call(resolverFactory, binder);
}
/// <summary>
/// Called when the user is accessing a protected or private member on a get.
///
/// The default implementation allows access to the fields or properties using reflection.
/// </summary>
public virtual ErrorInfo MakeNonPublicMemberGetError(OverloadResolverFactory resolverFactory, MemberTracker member, Type type, DynamicMetaObject instance) {
switch (member.MemberType) {
case TrackerTypes.Field:
FieldTracker ft = (FieldTracker)member;
return ErrorInfo.FromValueNoError(
Ast.Call(
AstUtils.Convert(AstUtils.Constant(ft.Field), typeof(FieldInfo)),
typeof(FieldInfo).GetMethod("GetValue"),
AstUtils.Convert(instance.Expression, typeof(object))
)
);
case TrackerTypes.Property:
PropertyTracker pt = (PropertyTracker)member;
return ErrorInfo.FromValueNoError(
MemberTracker.FromMemberInfo(pt.GetGetMethod(true)).Call(resolverFactory, this, instance).Expression
);
default:
throw new InvalidOperationException();
}
}
/// <summary>
/// Provides default binding for performing a call on the specified meta objects.
/// </summary>
/// <param name="signature">The signature describing the call</param>
/// <param name="target">The meta object to be called.</param>
/// <param name="args">
/// Additional meta objects are the parameters for the call as specified by the CallSignature in the CallAction.
/// </param>
/// <param name="resolverFactory">Overload resolver factory.</param>
/// <returns>A MetaObject representing the call or the error.</returns>
public DynamicMetaObject Call(CallSignature signature, OverloadResolverFactory resolverFactory, DynamicMetaObject target, params DynamicMetaObject[] args) {
ContractUtils.RequiresNotNullItems(args, "args");
ContractUtils.RequiresNotNull(resolverFactory, "resolverFactory");
TargetInfo targetInfo = GetTargetInfo(target, args);
if (targetInfo != null) {
// we're calling a well-known MethodBase
DynamicMetaObject res = MakeMetaMethodCall(signature, resolverFactory, targetInfo);
if (res.Expression.Type.IsValueType) {
res = new DynamicMetaObject(
AstUtils.Convert(res.Expression, typeof(object)),
res.Restrictions
);
}
return res;
} else {
// we can't call this object
return MakeCannotCallRule(target, target.GetLimitType());
}
}
public virtual ErrorInfo MakeEventValidation(MemberGroup members, DynamicMetaObject eventObject, DynamicMetaObject value, OverloadResolverFactory resolverFactory) {
EventTracker ev = (EventTracker)members[0];
// handles in place addition of events - this validates the user did the right thing.
return ErrorInfo.FromValueNoError(
Expression.Call(
typeof(BinderOps).GetMethod("SetEvent"),
AstUtils.Constant(ev),
value.Expression
)
);
}
private Expression ConvertIfNeeded(OverloadResolverFactory factory, Expression expression, Type type) {
Assert.NotNull(expression, type);
if (expression.Type != type) {
return ConvertExpression(expression, type, ConversionResultKind.ExplicitCast, factory);
}
return expression;
}
private DynamicMetaObject TryMakeInvertedBindingTarget(OverloadResolverFactory resolverFactory, MethodBase[] targets, DynamicMetaObject[] args) {
var resolver = resolverFactory.CreateOverloadResolver(args, new CallSignature(args.Length), CallTypes.None);
BindingTarget target = resolver.ResolveOverload(targets[0].Name, targets, NarrowingLevel.None, NarrowingLevel.All);
if (target.Success) {
return new DynamicMetaObject(
Ast.Not(target.MakeExpression()),
target.RestrictedArguments.GetAllRestrictions()
);
}
return null;
}
private DynamicMetaObject MakeArrayIndexRule(OverloadResolverFactory factory, IndexType oper, DynamicMetaObject[] args) {
if (CanConvertFrom(GetArgType(args, 1), typeof(int), false, NarrowingLevel.All)) {
BindingRestrictions restrictions = BindingRestrictionsHelpers.GetRuntimeTypeRestriction(args[0].Expression, args[0].GetLimitType()).Merge(BindingRestrictions.Combine(args));
if (oper == IndexType.Get) {
return new DynamicMetaObject(
Ast.ArrayAccess(
args[0].Expression,
ConvertIfNeeded(factory, args[1].Expression, typeof(int))
),
restrictions
);
} else {
return new DynamicMetaObject(
Ast.Assign(
Ast.ArrayAccess(
args[0].Expression,
ConvertIfNeeded(factory, args[1].Expression, typeof(int))
),
ConvertIfNeeded(factory, args[2].Expression, args[0].GetLimitType().GetElementType())
),
restrictions.Merge(args[1].Restrictions)
);
}
}
return null;
}
private DynamicMetaObject MakeMethodIndexRule(IndexType oper, OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
MethodInfo[] defaults = GetMethodsFromDefaults(args[0].GetLimitType().GetDefaultMembers(), oper);
if (defaults.Length != 0) {
DynamicMetaObject[] selfWithArgs = args;
ParameterExpression arg2 = null;
if (oper == IndexType.Set) {
Debug.Assert(args.Length >= 2);
// need to save arg2 in a temp because it's also our result
arg2 = Ast.Variable(args[2].Expression.Type, "arg2Temp");
args[2] = new DynamicMetaObject(
Ast.Assign(arg2, args[2].Expression),
args[2].Restrictions
);
}
BindingRestrictions restrictions = BindingRestrictions.Combine(args);
var resolver = resolverFactory.CreateOverloadResolver(selfWithArgs, new CallSignature(selfWithArgs.Length), CallTypes.ImplicitInstance);
BindingTarget target = resolver.ResolveOverload(oper == IndexType.Get ? "get_Item" : "set_Item", defaults, NarrowingLevel.None, NarrowingLevel.All);
if (target.Success) {
if (oper == IndexType.Get) {
return new DynamicMetaObject(
target.MakeExpression(),
restrictions.Merge(target.RestrictedArguments.GetAllRestrictions())
);
} else {
return new DynamicMetaObject(
Ast.Block(
new ParameterExpression[] { arg2 },
target.MakeExpression(),
arg2
),
restrictions.Merge(target.RestrictedArguments.GetAllRestrictions())
);
}
}
return MakeError(
resolver.MakeInvalidParametersError(target),
restrictions,
typeof(object)
);
}
return null;
}
private DynamicMetaObject TryReverseOperator(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
// we need a special conversion for the return type on MemberNames
if (args.Length > 0) {
MethodInfo[] targets = GetApplicableMembers(args[0].LimitType, info);
if (targets.Length > 0) {
return TryMakeBindingTarget(resolverFactory, targets, args, BindingRestrictions.Empty);
}
}
return null;
}
private DynamicMetaObject TryForwardOperator(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
MethodInfo[] targets = GetApplicableMembers(args[0].GetLimitType(), info);
BindingRestrictions restrictions = BindingRestrictions.Empty;
if (targets.Length > 0) {
return TryMakeBindingTarget(resolverFactory, targets, args, restrictions);
}
return null;
}
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity")] // TODO: fix
private DynamicMetaObject MakeOperatorRule(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
return
TryForwardOperator(info, resolverFactory, args) ??
TryReverseOperator(info, resolverFactory, args) ??
TryPrimitiveOperator(info, args) ??
TryMakeDefaultUnaryRule(info, args) ??
MakeOperatorError(info, args);
}
private DynamicMetaObject TryInvertedComparison(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject target, DynamicMetaObject[] args) {
ExpressionType revOp = GetInvertedOperator(info.Operator);
OperatorInfo revInfo = OperatorInfo.GetOperatorInfo(revOp);
Debug.Assert(revInfo != null);
// try the 1st type's opposite function result negated
MethodBase[] targets = GetApplicableMembers(target.GetLimitType(), revInfo);
if (targets.Length > 0) {
return TryMakeInvertedBindingTarget(resolverFactory, targets, args);
}
return null;
}
private DynamicMetaObject TryNumericComparison(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject[] args) {
MethodInfo[] targets = FilterNonMethods(
args[0].GetLimitType(),
GetMember(
MemberRequestKind.Operation,
args[0].GetLimitType(),
"Compare"
)
);
if (targets.Length > 0) {
var resolver = resolverFactory.CreateOverloadResolver(args, new CallSignature(args.Length), CallTypes.None);
BindingTarget target = resolver.ResolveOverload(targets[0].Name, targets, NarrowingLevel.None, NarrowingLevel.All);
if (target.Success) {
Expression call = AstUtils.Convert(target.MakeExpression(), typeof(int));
switch (info.Operator) {
case ExpressionType.GreaterThan: call = Ast.GreaterThan(call, AstUtils.Constant(0)); break;
case ExpressionType.LessThan: call = Ast.LessThan(call, AstUtils.Constant(0)); break;
case ExpressionType.GreaterThanOrEqual: call = Ast.GreaterThanOrEqual(call, AstUtils.Constant(0)); break;
case ExpressionType.LessThanOrEqual: call = Ast.LessThanOrEqual(call, AstUtils.Constant(0)); break;
case ExpressionType.Equal: call = Ast.Equal(call, AstUtils.Constant(0)); break;
case ExpressionType.NotEqual: call = Ast.NotEqual(call, AstUtils.Constant(0)); break;
}
return new DynamicMetaObject(
call,
target.RestrictedArguments.GetAllRestrictions()
);
}
}
return null;
}
private DynamicMetaObject TryComparisonMethod(OperatorInfo info, OverloadResolverFactory resolverFactory, DynamicMetaObject target, DynamicMetaObject[] args) {
MethodInfo[] targets = GetApplicableMembers(target.GetLimitType(), info);
if (targets.Length > 0) {
return TryMakeBindingTarget(resolverFactory, targets, args, BindingRestrictions.Empty);
}
return null;
}