lit-html/lib/template-factory.js

HTML template literals in JavaScript

/**
 * @license
 * Copyright (c) 2017 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt
 * The complete set of authors may be found at
 * http://polymer.github.io/AUTHORS.txt
 * The complete set of contributors may be found at
 * http://polymer.github.io/CONTRIBUTORS.txt
 * Code distributed by Google as part of the polymer project is also
 * subject to an additional IP rights grant found at
 * http://polymer.github.io/PATENTS.txt
 */
import { Template } from './template.js';
/**
 * The default TemplateFactory which caches Templates keyed on
 * result.type and result.strings.
 */
export function templateFactory(result) {
    let templateCache = templateCaches.get(result.type);
    if (templateCache === undefined) {
        templateCache = new Map();
        templateCaches.set(result.type, templateCache);
    }
    let template = templateCache.get(result.strings);
    if (template === undefined) {
        template = new Template(result, result.getTemplateElement());
        templateCache.set(result.strings, template);
    }
    return template;
}
// The first argument to JS template tags retain identity across multiple
// calls to a tag for the same literal, so we can cache work done per literal
// in a Map.
export const templateCaches = new Map();
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