42 lines
1.4 KiB
JavaScript
42 lines
1.4 KiB
JavaScript
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var assert = require('assert')
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var LRU = require('nanolru')
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module.exports = ChooComponentCache
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function ChooComponentCache (state, emit, lru) {
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assert.ok(this instanceof ChooComponentCache, 'ChooComponentCache should be created with `new`')
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assert.equal(typeof state, 'object', 'ChooComponentCache: state should be type object')
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assert.equal(typeof emit, 'function', 'ChooComponentCache: emit should be type function')
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if (typeof lru === 'number') this.cache = new LRU(lru)
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else this.cache = lru || new LRU(100)
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this.state = state
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this.emit = emit
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}
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// Get & create component instances.
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ChooComponentCache.prototype.render = function (Component, id) {
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assert.equal(typeof Component, 'function', 'ChooComponentCache.render: Component should be type function')
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assert.ok(typeof id === 'string' || typeof id === 'number', 'ChooComponentCache.render: id should be type string or type number')
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var el = this.cache.get(id)
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if (!el) {
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var args = []
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for (var i = 2, len = arguments.length; i < len; i++) {
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args.push(arguments[i])
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}
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args.unshift(Component, id, this.state, this.emit)
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el = newCall.apply(newCall, args)
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this.cache.set(id, el)
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}
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return el
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}
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// Because you can't call `new` and `.apply()` at the same time. This is a mad
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// hack, but hey it works so we gonna go for it. Whoop.
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function newCall (Cls) {
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return new (Cls.bind.apply(Cls, arguments)) // eslint-disable-line
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}
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