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Closure Compiler is a JavaScript optimizing compiler. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls. It is used in many of Google's JavaScript apps, including Gmail, Google Web Search, Google Maps, and Google Docs.

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/*
 * Copyright 2016 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 static com.google.common.base.Preconditions.checkState;

import com.google.javascript.rhino.Node;

/**
 * Checks whether there are J2CL generated source files with pattern "*.java.js".
 */
final class J2clSourceFileChecker implements CompilerPass {

  static final String HAS_J2CL_ANNOTATION_KEY = "HAS_J2CL";

  private final AbstractCompiler compiler;

  J2clSourceFileChecker(AbstractCompiler compiler) {
    this.compiler = compiler;
  }

  private static boolean hasJ2cl(Node root) {
    for (Node script = root.getFirstChild(); script != null; script = script.getNext()) {
      checkState(script.isScript());
      if (script.getSourceFileName() != null && script.getSourceFileName().endsWith(".java.js")) {
        return true;
      }
    }
    return false;
  }

  @Override
  public void process(Node externs, Node root) {
    if (hasJ2cl(root)) {
      markToRunJ2clPasses(compiler);
    }
  }

  static void markToRunJ2clPasses(AbstractCompiler compiler) {
    compiler.setRunJ2clPasses(true);
  }

  /**
   * Indicates whether it should run future J2CL passes with information from the compiler. For
   * example, if the compiler's HAS_J2CL annotation is false, it should.
   */
  static boolean shouldRunJ2clPasses(AbstractCompiler compiler) {
    return compiler.runJ2clPasses();
  }
}