refactor(locals): utilize hexo-util's Cache()

lib/hexo/locals.js

@@ -1,25 +1,22 @@
 'use strict';
 
+const { Cache } = require('hexo-util');
+
 class Locals {
   constructor() {
-    this.cache = {};
+    this.cache = new Cache();
     this.getters = {};
   }
 
   get(name) {
     if (typeof name !== 'string') throw new TypeError('name must be a string!');
 
-    let cache = this.cache[name];
-
-    if (cache == null) {
+    return this.cache.apply(name, () => {
       const getter = this.getters[name];
       if (!getter) return;
 
-      cache = getter();
-      this.cache[name] = cache;
-    }
-
-    return cache;
+      return getter();
+    });
   }
 
   set(name, value) {
@@ -29,7 +26,7 @@ class Locals {
     const getter = typeof value === 'function' ? value : () => value;
 
     this.getters[name] = getter;
-    this.cache[name] = null;
+    this.cache.del(name);
 
     return this;
   }
@@ -38,13 +35,13 @@ class Locals {
     if (typeof name !== 'string') throw new TypeError('name must be a string!');
 
     this.getters[name] = null;
-    this.cache[name] = null;
+    this.cache.del(name);
 
     return this;
   }
 
   invalidate() {
-    this.cache = {};
+    this.cache.flush();
 
     return this;
   }

test/scripts/hexo/locals.js

@@ -24,10 +24,10 @@ describe('Locals', () => {
     locals.set('foo', () => 'foo');
 
     // cache should be clear after new data is set
-    should.not.exist(locals.cache.foo);
+    should.not.exist(locals.cache.cache.foo);
     locals.get('foo').should.eql('foo');
     // cache should be saved once it's get
-    locals.cache.foo.should.eql('foo');
+    locals.cache.cache.foo.should.eql('foo');
   });
 
   it('set() - not function', () => {
@@ -69,7 +69,7 @@ describe('Locals', () => {
     locals.remove('foo');
 
     should.not.exist(locals.getters.foo);
-    should.not.exist(locals.cache.foo);
+    should.not.exist(locals.cache.cache.foo);
   });
 
   it('remove() - name must be a string', () => {
@@ -100,6 +100,6 @@ describe('Locals', () => {
     locals.get('foo');
     locals.invalidate();
 
-    should.not.exist(locals.cache.foo);
+    should.not.exist(locals.cache.cache.foo);
   });
 });