// checkAndComputeOperator handles specialized logic for operator members.
func (mb *MemberDecorator) checkAndComputeOperator(memberNode compilergraph.ModifiableGraphNode, name string) {
name = strings.ToLower(name)
// Verify that the operator matches a known operator.
definition, ok := mb.tdg.operators[name]
if !ok {
mb.tdg.decorateWithError(memberNode, "Unknown operator '%s' defined on type '%s'", name, mb.parent().Name())
return
}
// Some operators are static and some are assignable.
mb.static = definition.IsStatic
mb.readonly = !definition.IsAssignable
// Ensure that the declared return type is equal to that expected.
declaredReturnType := mb.memberType.Generics()[0]
containingType := mb.tdg.NewInstanceTypeReference(mb.parent().AsType())
expectedReturnType := definition.ExpectedReturnType(containingType)
if !mb.skipOperatorChecking {
if !expectedReturnType.IsAny() && !declaredReturnType.IsAny() && declaredReturnType != expectedReturnType {
mb.tdg.decorateWithError(memberNode, "Operator '%s' defined on type '%s' expects a return type of '%v'; found %v",
name, mb.parent().Name(), expectedReturnType, declaredReturnType)
return
}
}
// Decorate the operator with its return type.
var actualReturnType = expectedReturnType
if expectedReturnType.IsAny() {
actualReturnType = declaredReturnType
}
mb.CreateReturnable(mb.sourceNode, actualReturnType)
// Ensure we have the expected number of parameters.
parametersExpected := definition.Parameters
if !mb.skipOperatorChecking {
if mb.memberType.ParameterCount() != len(parametersExpected) {
mb.tdg.decorateWithError(memberNode, "Operator '%s' defined on type '%s' expects %v parameters; found %v",
name, mb.parent().Name(), len(parametersExpected), mb.memberType.ParameterCount())
return
}
}
var memberType = mb.tdg.NewTypeReference(mb.tdg.FunctionType(), actualReturnType)
// Ensure the parameters expected on the operator match those specified.
parameterTypes := mb.memberType.Parameters()
for index, parameterType := range parameterTypes {
if !mb.skipOperatorChecking {
expectedType := parametersExpected[index].ExpectedType(containingType)
if !expectedType.IsAny() && expectedType != parameterType {
mb.tdg.decorateWithError(memberNode, "Parameter '%s' (#%v) for operator '%s' defined on type '%s' expects type %v; found %v",
parametersExpected[index].Name, index, name, mb.parent().Name(),
expectedType, parameterType)
}
}
memberType = memberType.WithParameter(parameterType)
}
// Decorate the member with its type.
memberNode.DecorateWithTagged(NodePredicateMemberType, memberType)
// Decorate the member with its signature.
if definition.IsStatic {
mb.decorateWithSig(mb.tdg.AnyTypeReference())
} else {
mb.decorateWithSig(memberType)
}
}
// decorateWithError decorates the given node with an associated error node.
func (t *TypeGraph) decorateWithError(node compilergraph.ModifiableGraphNode, message string, args ...interface{}) {
errorNode := node.Modifier().CreateNode(NodeTypeError)
errorNode.Decorate(NodePredicateErrorMessage, fmt.Sprintf(message, args...))
node.Connect(NodePredicateError, errorNode)
}
// Define defines the member under the type or module in the type graph.
func (mb *MemberBuilder) Define() TGMember {
var name = mb.name
if mb.isOperator {
// Normalize the name by lowercasing it.
name = strings.ToLower(mb.name)
}
// Create the member node.
var memberNode compilergraph.ModifiableGraphNode
if mb.isOperator {
memberNode = mb.modifier.CreateNode(NodeTypeOperator)
memberNode.Decorate(NodePredicateOperatorName, name)
memberNode.Decorate(NodePredicateMemberName, operatorMemberNamePrefix+name)
} else {
memberNode = mb.modifier.CreateNode(NodeTypeMember)
memberNode.Decorate(NodePredicateMemberName, name)
}
if mb.hasSourceNode {
memberNode.Connect(NodePredicateSource, mb.sourceNode)
}
memberNode.Decorate(NodePredicateModulePath, mb.parent.ParentModule().Get(NodePredicateModulePath))
// Decorate the member with its generics.
for index, genericInfo := range mb.memberGenerics {
genericBuilder := genericBuilder{
modifier: mb.modifier,
tdg: mb.tdg,
parentNode: memberNode,
genericKind: typeMemberGeneric,
index: index,
parentPredicate: NodePredicateMemberGeneric,
}
genericBuilder.Name(genericInfo.name)
if genericInfo.hasSourceNode {
genericBuilder.SourceNode(genericInfo.sourceNode)
}
genericBuilder.defineGeneric()
}
// Add the member to the parent node.
parentNode := mb.modifier.Modify(mb.parent.Node())
if mb.isOperator {
parentNode.Connect(NodePredicateTypeOperator, memberNode)
} else {
parentNode.Connect(NodePredicateMember, memberNode)
}
return TGMember{memberNode.AsNode(), mb.tdg}
}