extensions/cxx_debugging/third_party/lit-html/lib/default-template-processor.js

/**
 * @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 { AttributeCommitter, BooleanAttributePart, EventPart, NodePart, PropertyCommitter } from './parts.js';
/**
 * Creates Parts when a template is instantiated.
 */
export class DefaultTemplateProcessor {
    /**
     * Create parts for an attribute-position binding, given the event, attribute
     * name, and string literals.
     *
     * @param element The element containing the binding
     * @param name  The attribute name
     * @param strings The string literals. There are always at least two strings,
     *   event for fully-controlled bindings with a single expression.
     */
    handleAttributeExpressions(element, name, strings, options) {
        const prefix = name[0];
        if (prefix === '.') {
            const committer = new PropertyCommitter(element, name.slice(1), strings);
            return committer.parts;
        }
        if (prefix === '@') {
            return [new EventPart(element, name.slice(1), options.eventContext)];
        }
        if (prefix === '?') {
            return [new BooleanAttributePart(element, name.slice(1), strings)];
        }
        const committer = new AttributeCommitter(element, name, strings);
        return committer.parts;
    }
    /**
     * Create parts for a text-position binding.
     * @param templateFactory
     */
    handleTextExpression(options) {
        return new NodePart(options);
    }
}
export const defaultTemplateProcessor = new DefaultTemplateProcessor();
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