Make Properties class

src/shared/settings/Properties.ts

@@ -0,0 +1,110 @@
+export type PropertiesJSON = {
+  hintchars?: string;
+  smoothscroll?: boolean;
+  complete?: string;
+};
+
+export type PropertyTypes = {
+  hintchars: string;
+  smoothscroll: string;
+  complete: string;
+};
+
+type PropertyName = 'hintchars' | 'smoothscroll' | 'complete';
+
+type PropertyDef = {
+  name: PropertyName;
+  description: string;
+  defaultValue: string | number | boolean;
+  type: 'string' | 'number' | 'boolean';
+};
+
+const defs: PropertyDef[] = [
+  {
+    name: 'hintchars',
+    description: 'hint characters on follow mode',
+    defaultValue: 'abcdefghijklmnopqrstuvwxyz',
+    type: 'string',
+  }, {
+    name: 'smoothscroll',
+    description: 'smooth scroll',
+    defaultValue: false,
+    type: 'boolean',
+  }, {
+    name: 'complete',
+    description: 'which are completed at the open page',
+    defaultValue: 'sbh',
+    type: 'string',
+  }
+];
+
+const defaultValues = {
+  hintchars: 'abcdefghijklmnopqrstuvwxyz',
+  smoothscroll: false,
+  complete: 'sbh',
+};
+
+export default class Properties {
+  public hintchars: string;
+
+  public smoothscroll: boolean;
+
+  public complete: string;
+
+  constructor({
+    hintchars,
+    smoothscroll,
+    complete,
+  }: {
+    hintchars?: string;
+    smoothscroll?: boolean;
+    complete?: string;
+  }) {
+    this.hintchars = hintchars || defaultValues.hintchars;
+    this.smoothscroll = smoothscroll || defaultValues.smoothscroll;
+    this.complete = complete || defaultValues.complete;
+  }
+
+  static fromJSON(json: any): Properties {
+    let defNames: Set<string> = new Set(defs.map(def => def.name));
+    let unknownName = Object.keys(json).find(name => !defNames.has(name));
+    if (unknownName) {
+      throw new TypeError(`Unknown property name: "${unknownName}"`);
+    }
+
+    for (let def of defs) {
+      if (!Object.prototype.hasOwnProperty.call(json, def.name)) {
+        continue;
+      }
+      if (typeof json[def.name] !== def.type) {
+        throw new TypeError(
+          `property "${def.name}" is not ${def.type}`);
+      }
+    }
+    return new Properties(json);
+  }
+
+  static types(): PropertyTypes {
+    return {
+      hintchars: 'string',
+      smoothscroll: 'boolean',
+      complete: 'string',
+    };
+  }
+
+  static def(name: string): PropertyDef | undefined {
+    return defs.find(p => p.name === name);
+  }
+
+  static defs(): PropertyDef[] {
+    return defs;
+  }
+
+  toJSON(): PropertiesJSON {
+    return {
+      hintchars: this.hintchars,
+      smoothscroll: this.smoothscroll,
+      complete: this.complete,
+    };
+  }
+}