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Maven plugin for compressing JS files at build time
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/**
 * Copyright (C) 2014-2015 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;

import javax.annotation.Nonnull;

import org.apache.maven.plugin.logging.Log;

import com.google.common.collect.Lists;

/**
 * The main class running the Closure compiler. It must reside in this package,
 * as AbstractCommandLineRunner has only package visibility.
 *
 * @author Philip Helger
 */
public final class ClosureRunner extends AbstractCommandLineRunner 
{
  private final Log m_aLog;
  private final String m_sCharset;

  private static final boolean DEBUG = false;
  private static final boolean GENERATE_EXPORTS = false;
  private final CompilationLevel m_eLevel = CompilationLevel.SIMPLE_OPTIMIZATIONS;

  public ClosureRunner (@Nonnull final Log aLog, @Nonnull final String sCharset)
  {
    if (aLog == null)
      throw new NullPointerException ("log");
    if (sCharset == null)
      throw new NullPointerException ("charset");
    m_aLog = aLog;
    m_sCharset = sCharset;
  }

  @Override
  protected void addWhitelistWarningsGuard (@Nonnull final CompilerOptions aOptions, @Nonnull final File aWhitelistFile)
  {
    aOptions.addWarningsGuard (WhitelistWarningsGuard.fromFile (aWhitelistFile));
  }

  @Override
  protected Compiler createCompiler ()
  {
    return new Compiler (System.err);
  }

  @Override
  protected List  createExterns () throws FlagUsageException, IOException
  {
    final List  externs = super.createExterns ();
    // Use the default externs provided by the Closure CommandLineRunner
    final List  defaultExterns = CommandLineRunner.getDefaultExterns ();
    defaultExterns.addAll (externs);
    return defaultExterns;
  }

  @Override
  protected CompilerOptions createOptions ()
  {
    final CompilerOptions options = new CompilerOptions ();
    options.setCodingConvention (new ClosureCodingConvention ());
    final CompilationLevel level = m_eLevel;
    level.setOptionsForCompilationLevel (options);
    if (DEBUG)
      level.setDebugOptionsForCompilationLevel (options);

    if (GENERATE_EXPORTS)
      options.setGenerateExports (GENERATE_EXPORTS);

    WarningLevel.QUIET.setOptionsForWarningLevel (options);
    options.prettyPrint = false;
    options.printInputDelimiter = false;
    options.closurePass = false;
    return options;
  }

  private void _setDefaultConfig ()
  {
    getCommandLineConfig ().setPrintTree (false)
                           .setPrintAst (false)
                           .setPrintPassGraph (false)
                           .setJscompDevMode (CompilerOptions.DevMode.OFF)
                           .setLoggingLevel (Level.WARNING.getName ())
                           .setExterns (Lists. newArrayList ())
                           .setJs (Lists. newArrayList ())
                           .setJsOutputFile ("")
                           .setModule (Lists. newArrayList ())
                           .setVariableMapInputFile ("")
                           .setPropertyMapInputFile ("")
                           .setVariableMapOutputFile ("")
                           .setCreateNameMapFiles (false)
                           .setPropertyMapOutputFile ("")
                           .setCodingConvention (true ? CodingConventions.getDefault ()
                                                     : new ClosureCodingConvention ())
                           .setSummaryDetailLevel (1)
                           .setOutputWrapper ("")
                           .setModuleWrapper (Lists. newArrayList ())
                           .setModuleOutputPathPrefix ("./")
                           .setCreateSourceMap ("")
                           .setDefine (Lists. newArrayList ())
                           .setCharset (m_sCharset)
                           .setManageClosureDependencies (false)
                           .setClosureEntryPoints (Lists. newArrayList ())
                           .setOutputManifest (Lists. newArrayList ())
                           .setAcceptConstKeyword (false)
                           .setLanguageIn ("ECMASCRIPT5");
  }

  public boolean compressJSFile (@Nonnull final File aSourceFile,
                                 @Nonnull final File aDestFile,
                                 @Nonnull final File [] aExterns)
  {
    if (aSourceFile == null)
      throw new NullPointerException ("sourceFile");

    try
    {
      // Build result file name
      m_aLog.info ("Compressing JS " + aSourceFile.getName () + " to " + aDestFile.getName ());

      final List  aExternList = new ArrayList  ();
      for (final File f : aExterns)
        aExternList.add (f.getAbsolutePath ());

      _setDefaultConfig ();
      getCommandLineConfig ().setExterns (aExternList)
                             .setJs (Lists.newArrayList (aSourceFile.getAbsolutePath ()))
                             .setJsOutputFile (aDestFile.getAbsolutePath ());

      final int nErrors = doRun ();
      if (nErrors == 0)
        return true;
      m_aLog.error ("Failed to compress JS with " + nErrors + " errors: " + aSourceFile.getName ());
    }
    catch (final Exception ex)
    {
      m_aLog.error ("Failed to compress JS " + aSourceFile.toString (), ex);
    }
    return false;
  }
}