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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. This binary checks for style issues such as incorrect or missing JSDoc usage, and missing goog.require() statements. It does not do more advanced checks such as typechecking.

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/*
 * Copyright 2007 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.parsing.parser.util.format.SimpleFormat;

import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * An error manager that logs errors and warnings using a logger in addition to
 * collecting them in memory. Errors are logged at the SEVERE level and warnings
 * are logged at the WARNING level.
 */
public final class LoggerErrorManager extends BasicErrorManager {
  private final MessageFormatter formatter;
  private final Logger logger;

  /**
   * Creates an instance.
   */
  public LoggerErrorManager(MessageFormatter formatter, Logger logger) {
    this.formatter = formatter;
    this.logger = logger;
  }

  /**
   * Creates an instance with a source-less error formatter.
   */
  public LoggerErrorManager(Logger logger) {
    this(LightweightMessageFormatter.withoutSource(), logger);
  }

  @Override
  public void println(CheckLevel level, JSError error) {
    switch (level) {
      case ERROR:
        logger.severe(error.format(level, formatter));
        break;
      case WARNING:
        logger.warning(error.format(level, formatter));
        break;
      case OFF:
        break;
    }
  }

  @Override
  protected void printSummary() {
    Level level = (getErrorCount() + getWarningCount() == 0) ?
        Level.INFO : Level.WARNING;
    if (getTypedPercent() > 0.0) {
      logger.log(level, SimpleFormat.format(
          "%d error(s), %d warning(s), %.1f%% typed",
          getErrorCount(), getWarningCount(), getTypedPercent()));
    } else if (getErrorCount() + getWarningCount() > 0) {
      logger.log(level, SimpleFormat.format(
          "%d error(s), %d warning(s)",
          getErrorCount(), getWarningCount()));
    }
  }
}