// scopeStructuralNewTypeExpression scopes a structural new expression for constructing a new instance
// of a structural or class type.
func (sb *scopeBuilder) scopeStructuralNewTypeExpression(node compilergraph.GraphNode, childScope *proto.ScopeInfo, context scopeContext) proto.ScopeInfo {
// Retrieve the static type.
staticTypeRef := childScope.StaticTypeRef(sb.sg.tdg)
// Ensure that the static type is a struct OR it is a class with an accessible 'new'.
staticType := staticTypeRef.ReferredType()
switch staticType.TypeKind() {
case typegraph.ClassType:
// Classes can only be constructed structurally if they are in the same module as this call.
// Otherwise, an exported constructor must be used.
module := compilercommon.InputSource(node.Get(parser.NodePredicateSource))
_, rerr := staticTypeRef.ResolveAccessibleMember("new", module, typegraph.MemberResolutionStatic)
if rerr != nil {
sb.decorateWithError(node, "Cannot structurally construct type %v, as it is imported from another module", staticTypeRef)
return newScope().Invalid().Resolving(staticTypeRef).GetScope()
}
case typegraph.StructType:
// Structs can be constructed by anyone, assuming that their members are all exported.
// That check occurs below.
break
default:
sb.decorateWithError(node, "Cannot structurally construct type %v", staticTypeRef)
return newScope().Invalid().Resolving(staticTypeRef).GetScope()
}
encountered, isValid := sb.scopeStructuralNewEntries(node, context)
if !isValid {
return newScope().Invalid().Resolving(staticTypeRef).GetScope()
}
// Ensure that all required entries are present.
for _, field := range staticType.RequiredFields() {
if _, ok := encountered[field.Name()]; !ok {
isValid = false
sb.decorateWithError(node, "Non-nullable %v '%v' is required to construct type %v", field.Title(), field.Name(), staticTypeRef)
}
}
return newScope().IsValid(isValid).Resolving(staticTypeRef).GetScope()
}
