Refactor casting

Refactors casting a bit. Fixes a bug where arrays were not being cast
correctly. I think this won't really scale to more complex types and we
should consider a dependency to handle this or code up a more
runtime dependent solution. But for now i'm aiming to
get it working well for the simple cases. Still have some tests to do.

template/src/pdk.ts.ejs

@@ -2,6 +2,37 @@
 const hostFunctions = Host.getFunctions()
 <% } %>
 
+function isNull(v: any): boolean {
+  return v === undefined || v === null
+}
+
+function cast(caster: (v: any) => any, v: any): any {
+  if (isNull(v)) return v
+  if (Array.isArray(v)) return v.map(caster)
+  return caster(v)
+}
+
+function dateToJson(v: Date): string {
+  return v.toISOString()
+}
+function dateFromJson(v: string): Date {
+  return new Date(v)
+}
+
+function bufferToJson(v: ArrayBuffer): string {
+  return Host.arrayBufferToBase64(v)
+}
+function bufferFromJson(v: string): ArrayBuffer {
+  return Host.base64ToArrayBuffer(v)
+}
+
+function schemaArrayToJson<T>(type: any, v: Array<T>): Array<any> {
+  return v.map(type.toJson)
+}
+function schemaArrayFromJson<T>(type: any, v: Array<object>): Array<T> {
+  return v.map(type.fromJson)
+}
+
 <% Object.values(schema.schemas).forEach(schema => { %>
   <% if (schema.properties.length > 0) { %>
 
@@ -24,12 +55,14 @@ export class <%- schema.name %> {
     return {
       ...obj,
       <% schema.properties.forEach(p => { -%>
-        <% if (isDateTime(p)) { -%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %> : new Date(obj.<%- p.name -%>),
-        <% } else if (isBuffer(p)) {-%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %> : Host.base64ToArrayBuffer(obj.<%- p.name -%>),
-        <% } else if (!isPrimitive(p)) {-%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %> : <%- p.$ref.name %>.fromJson(obj.<%- p.name -%>),
+        <% let baseP = p.items ? p.items : p -%>
+        <% let baseRef = p.$ref ? p.$ref.name : (p.items && p.items.$ref ? p.items.$ref.name : null)  -%>
+        <% if (isDateTime(baseP)) { -%>
+          <%- p.name -%>: cast(dateFromJson, obj.<%- p.name -%>),
+        <% } else if (isBuffer(baseP)) {-%>
+          <%- p.name -%>: cast(bufferFromJson, obj.<%- p.name -%>),
+        <% } else if (!isPrimitive(baseP)) {-%>
+          <%- p.name -%>: cast(<%- baseRef -%>.toJson, obj.<%- p.name -%>),
         <% } -%>
       <% }) -%>
     }
@@ -39,12 +72,14 @@ export class <%- schema.name %> {
     return {
       ...obj,
       <% schema.properties.forEach(p => { -%>
-        <% if (p.type === "string" && p.format === "date-time") { -%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %> : obj.<%- p.name %>.toISOString(),
-        <% } else if (isBuffer(p)) {-%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %> : Host.arrayBufferToBase64(obj.<%- p.name -%>),
-        <% } else if (p.$ref && !p.$ref.enum) {-%>
-          <%- p.name -%>: obj.<%- p.name -%> === undefined || obj.<%- p.name -%> === null ? obj.<%- p.name %>: <%- p.$ref.name %>.toJson(obj.<%- p.name -%>) ,
+        <% let baseP = p.items ? p.items : p -%>
+        <% let baseRef = p.$ref ? p.$ref.name : (p.items && p.items.$ref ? p.items.$ref.name : null)  -%>
+        <% if (isDateTime(baseP)) { -%>
+          <%- p.name -%>: cast(dateToJson, obj.<%- p.name -%>),
+        <% } else if (isBuffer(baseP)) {-%>
+          <%- p.name -%>: cast(bufferToJson, obj.<%- p.name -%>),
+        <% } else if (!isPrimitive(baseP)) {-%>
+          <%- p.name -%>: cast(<%- baseRef -%>.toJson, obj.<%- p.name -%>),
         <% } -%>
       <% }) -%>
     }

tests/schemas/fruit.yaml

@@ -110,6 +110,11 @@ components:
       description: A set of all the enemies of pac-man
     ComplexObject:
       properties:
+        arrayOfDate:
+          type: array
+          items:
+            type: string
+            format: date-time
         ghost:
           "$ref": "#/components/schemas/GhostGang"
           description: I can override the description for the property here