@adobe/htlengine/src/parser/plugins/ElementPlugin.js

Javascript Based HTL (Sightly) parser

/*
 * Copyright 2018 Adobe. All rights reserved.
 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. You may obtain a copy
 * of the License at http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under
 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
 * OF ANY KIND, either express or implied. See the License for the specific language
 * governing permissions and limitations under the License.
 */

const Plugin = require('../html/Plugin');
const VariableBinding = require('../commands/VariableBinding');
const Conditional = require('../commands/Conditional');
const OutputVariable = require('../commands/OutputVariable');
const CreateElement = require('../commands/CreateElement');
const PopElement = require('../commands/PopElement');
const MarkupContext = require('../html/MarkupContext');
const ExpressionContext = require('../html/ExpressionContext');

module.exports = class ElementPlugin extends Plugin {
  constructor(signature, pluginContext, expression) {
    super(signature, pluginContext, expression);

    this.node = pluginContext.adjustToContext(
      expression,
      MarkupContext.ELEMENT_NAME_NF,
      ExpressionContext.ELEMENT,
    ).root;
    this.tagVar = pluginContext.generateVariable('tagVar');
  }

  beforeElement(stream) {
    stream.write(new VariableBinding.Start(this.tagVar, this.node));
  }

  beforeTagOpen(stream, isEmpty, isVoid) {
    stream.write(new Conditional.Start(this.tagVar));
    stream.write(new CreateElement(new OutputVariable(this.tagVar), isEmpty, isVoid));
    stream.write(Conditional.END);
    stream.write(new Conditional.Start(this.tagVar, true));
  }

  // eslint-disable-next-line class-methods-use-this
  beforeAttributes(stream) {
    stream.write(Conditional.END);
  }

  beforeTagClose(stream, isEmpty, isVoid) {
    stream.write(new Conditional.Start(this.tagVar));
    stream.write(new PopElement(new OutputVariable(this.tagVar), isEmpty, isVoid));
    stream.write(Conditional.END);
    stream.write(new Conditional.Start(this.tagVar, true));
  }

  // eslint-disable-next-line class-methods-use-this
  afterTagClose(stream/* , isSelfClosing */) {
    stream.write(Conditional.END);
  }

  // eslint-disable-next-line class-methods-use-this
  afterElement(stream) {
    stream.write(VariableBinding.END);
  }
};