Codegen: Improve return type of self-typed properties

misc/codegen/lib/ql.py

@@ -45,6 +45,7 @@ class Property:
     synth: bool = False
     type_is_hideable: bool = False
     type_is_codegen_class: bool = False
+    type_is_self: bool = False
     internal: bool = False
     cfg: bool = False
 
@@ -83,6 +84,10 @@ class Property:
     def is_indexed(self) -> bool:
         return self.is_repeated and not self.is_unordered
 
+    @property
+    def type_alias(self) -> Optional[str]:
+        return self.type + "Alias" if self.type_is_self else self.type
+
 
 @dataclass
 class Base:
@@ -116,11 +121,18 @@ class Class:
         self.bases_impl = get_bases(self.bases_impl)
         if self.properties:
             self.properties[0].first = True
+            for prop in self.properties:
+                if prop.type is self.name:
+                    prop.type_is_self = True
 
     @property
     def root(self) -> bool:
         return not self.bases
 
+    @property
+    def needs_self_alias(self) -> bool:
+        return self.root or any(p.type_is_self for p in self.properties)
+
     @property
     def path(self) -> pathlib.Path:
         return self.dir / self.name

misc/codegen/templates/ql_class.mustache

@@ -9,9 +9,9 @@ private import {{import_prefix}}.Raw
 {{#imports}}
 import {{.}}
 {{/imports}}
-{{#root}}
+{{#needs_self_alias}}
 private class {{name}}Alias = {{name}};
-{{/root}}
+{{/needs_self_alias}}
 /**
  * INTERNAL: This module contains the fully generated definition of `{{name}}` and should not
  * be referenced directly.
@@ -77,7 +77,7 @@ module Generated {
      * INTERNAL: Do not use.
     {{/internal}}
      */
-    {{type}} get{{#is_unordered}}An{{/is_unordered}}Immediate{{singular}}({{#is_indexed}}int index{{/is_indexed}}) {
+    {{type_alias}} get{{#is_unordered}}An{{/is_unordered}}Immediate{{singular}}({{#is_indexed}}int index{{/is_indexed}}) {
       {{^synth}}
       result = Synth::convert{{type}}FromRaw(Synth::convert{{name}}ToRaw(this){{^root}}.(Raw::{{name}}){{/root}}.{{getter}}({{#is_indexed}}index{{/is_indexed}}))
       {{/synth}}
@@ -95,7 +95,7 @@ module Generated {
      * INTERNAL: Do not use.
     {{/internal}}
      */
-    final {{type}} {{getter}}({{#is_indexed}}int index{{/is_indexed}}) {
+    final {{type_alias}} {{getter}}({{#is_indexed}}int index{{/is_indexed}}) {
       exists({{type}} immediate | immediate = this.get{{#is_unordered}}An{{/is_unordered}}Immediate{{singular}}({{#is_indexed}}index{{/is_indexed}}) and
         {{#hideable}}if exists(this.getResolveStep()) then result = immediate else {{/hideable}}result = immediate.resolve())
     }
@@ -111,7 +111,7 @@ module Generated {
      * INTERNAL: Do not use.
     {{/internal}}
      */
-    {{type}} {{getter}}({{#is_indexed}}int index{{/is_indexed}}) {
+    {{type_alias}} {{getter}}({{#is_indexed}}int index{{/is_indexed}}) {
       {{^synth}}
       {{^is_predicate}}result = {{/is_predicate}}{{#type_is_codegen_class}}Synth::convert{{type}}FromRaw({{/type_is_codegen_class}}Synth::convert{{name}}ToRaw(this){{^root}}.(Raw::{{name}}){{/root}}.{{getter}}({{#is_indexed}}index{{/is_indexed}}){{#type_is_codegen_class}}){{/type_is_codegen_class}}
       {{/synth}}
@@ -140,7 +140,7 @@ module Generated {
      * INTERNAL: Do not use.
     {{/internal}}
      */
-    final {{type}} {{indefinite_getter}}() {
+    final {{type_alias}} {{indefinite_getter}}() {
       result = this.{{getter}}(_)
     }
     {{^is_optional}}