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Liferay Frontend JS Minifier

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/*
 * Copyright 2017 The Closure Compiler Authors.
 *
 * Licensed 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 CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.javascript.jscomp;

import com.google.javascript.jscomp.NodeTraversal.AbstractPostOrderCallback;
import com.google.javascript.jscomp.parsing.parser.FeatureSet;
import com.google.javascript.jscomp.parsing.parser.FeatureSet.Feature;
import com.google.javascript.rhino.Node;

/**
 * Normalizes shorthand object properties. This should be one of the first things done when
 * transpiling from ES6 down to ES5, as it allows all the following checks and transpilations to not
 * care about shorthand and destructured assignments.
 */
public final class Es6NormalizeShorthandProperties extends AbstractPostOrderCallback
    implements HotSwapCompilerPass {
  private final AbstractCompiler compiler;
  private static final FeatureSet transpiledFeatures =
      FeatureSet.BARE_MINIMUM.with(Feature.EXTENDED_OBJECT_LITERALS);

  public Es6NormalizeShorthandProperties(AbstractCompiler compiler) {
    this.compiler = compiler;
  }

  @Override
  public void process(Node externs, Node root) {
    TranspilationPasses.processTranspile(compiler, externs, transpiledFeatures, this);
    TranspilationPasses.processTranspile(compiler, root, transpiledFeatures, this);
  }

  @Override
  public void hotSwapScript(Node scriptRoot, Node originalRoot) {
    TranspilationPasses.hotSwapTranspile(compiler, scriptRoot, transpiledFeatures, this);
  }

  @Override
  public void visit(NodeTraversal t, Node n, Node parent) {
    // Remove all IS_SHORTHAND_PROPERTY annotations on all nodes so that the code printer
    // does not print it as shorthand.
    if (n.isStringKey()) {
      n.setShorthandProperty(false);
    }
  }
}