/*
 * Copyright 2018 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.common.base.Preconditions;
import com.google.javascript.rhino.Node;

/** Removes the contents of weak source files. */
class RemoveWeakSources implements CompilerPass {

  private final AbstractCompiler compiler;

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

  @Override
  public void process(Node externs, Node root) {
    for (Node script = root.getFirstChild(); script != null; script = script.getNext()) {
      Preconditions.checkState(script.isScript());
      if (script.getStaticSourceFile().isWeak()) {
        // Keep the file but remove the contents, since some users expect the number of input and
        // output files to be the same.
        NodeUtil.deleteChildren(script, compiler);
      }
    }
  }
}
