Add or else (default) to yaml spec.

ast-generator/src/deserialize.rs

@@ -70,11 +70,12 @@ fn get_single_child_to_build(name: &str, rule: &str, optional: bool, build: &Yam
     }
 }
 
-fn get_single_child(name: &str, rule: &str, optional: bool, build: &Yaml) -> ChildSpec {
+fn get_single_child(name: &str, rule: &str, optional: bool, or_else: Option<String>, build: &Yaml) -> ChildSpec {
     ChildSpec::SingleChild(SingleChild::new(
         name,
         rule,
         get_single_child_to_build(name, rule, optional, build),
+        or_else
     ))
 }
 
@@ -109,8 +110,21 @@ fn get_child_specs(children: &Yaml) -> Vec<ChildSpec> {
                     let optional = props["optional"]
                         .as_bool()
                         .unwrap_or_else(|| false);
+                    let or_else = props["or_else"]
+                        .as_str()
+                        .map(|s| s.to_string())
+                        .or_else(|| {
+                            let or_else_default = props["or_else_default"]
+                                .as_bool()
+                                .unwrap_or_else(|| false);
+                            if or_else_default {
+                                Some(String::from("default"))
+                            } else {
+                                None
+                            }
+                        });
                     
-                    get_single_child(name, &rule, optional, build)
+                    get_single_child(name, &rule, optional, or_else, build)
                 }
             } else {
                 ChildSpec::SingleChild(SingleChild::from_name_snake(child_spec.as_str().unwrap()))

ast-generator/src/spec.rs

@@ -224,6 +224,7 @@ pub struct SingleChild {
     name: String,
     rule: String,
     build: SingleChildToBuild,
+    or_else: Option<String>
 }
 
 impl SingleChild {
@@ -235,14 +236,16 @@ impl SingleChild {
                 &name.to_case(Case::Pascal),
                 false,
             )),
+            or_else: None,
         }
     }
 
-    pub fn new(name: &str, rule: &str, build: SingleChildToBuild) -> Self {
+    pub fn new(name: &str, rule: &str, build: SingleChildToBuild, or_else: Option<String>) -> Self {
         Self {
             name: name.to_string(),
             rule: rule.to_string(),
             build,
+            or_else,
         }
     }
 

src/parser/ast.schema.yaml

@@ -82,6 +82,12 @@ $defs:
       optional:
         type: boolean
         description: If true, this child will be stored as an Option.
+      or_else:
+        type: string
+        description: The method name to call upon the built-type if the rule is not found. Takes precedence over "or_else_default".
+      or_else_default:
+        type: boolean
+        description: Whether to call the default method on the built-type if the rule is not found.
       build:
         oneOf:
           - type: string

src/parser/ast.yaml

@@ -112,9 +112,9 @@ Interface:
         skip: true
     - identifier
     - generic_parameters:
-        optional: true
+        or_else_default: true
     - implements_list:
-        optional: true
+        or_else_default: true
     - declarations:
         rule: InterfaceLevelDeclaration
         vec: true
@@ -133,11 +133,11 @@ Class:
         skip: true
     - identifier
     - generic_parameters:
-        optional: true
+        or_else_default: true
     - class_constructor:
-        optional: true
+        or_else_default: true
     - implements_list:
-        optional: true
+        or_else_default: true
     - class_level_declarations:
         rule: ClassLevelDeclaration
         vec: true
@@ -155,17 +155,17 @@ Function:
         skip: true
     - generics:
         rule: GenericParameters
-        optional: true
+        or_else_default: true
     - identifier
     - parameters
     - return_type:
-        optional: true
+        or_else: void
     - function_body
 OperatorFunction:
   children:
     - is_public:
         rule: Pub
-        build: 
+        build:
           type: boolean
           on: rule_present
     - op_kw:
@@ -173,17 +173,17 @@ OperatorFunction:
         skip: true
     - generics:
         rule: GenericParameters
-        optional: true
+        or_else_default: true
     - operator
     - parameters
     - return_type:
-        optional: true
+        or_else: void
     - function_body
 PlatformFunction:
   children:
     - is_public:
         rule: Pub
-        build: 
+        build:
           type: boolean
           on: rule_present
     - platform_kw:
@@ -194,7 +194,7 @@ PlatformFunction:
         skip: true
     - generics:
         rule: GenericParameters
-        optional: true
+        or_else_default: true
     - identifier
     - parameters
     - return_type