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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 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.common.base.Optional;
import com.google.common.collect.ImmutableList;
import com.google.javascript.jscomp.Requirement.WhitelistEntry;

/**
 * The error manager is in charge of storing, organizing and displaying
 * errors and warnings generated by the compiler.
 */
public interface ErrorManager extends ErrorHandler {
  /**
   * Reports an error. The errors will be displayed by the
   * {@link #generateReport()} at the discretion of the implementation.
   *
   * @param level the reporting level
   * @param error the error to report
   */
  @Override
  void report(CheckLevel level, JSError error);

  /**
   * Writes a report to an implementation-specific medium. The compiler calls
   * this method after any and all {@link #report} calls.
   */
  void generateReport();

  /**
   * Gets the number of reported errors.
   */
  int getErrorCount();

  /**
   * Gets the number of reported warnings.
   */
  int getWarningCount();

  /** Gets all the errors. */
  ImmutableList getErrors();

  /** Gets all the warnings. */
  ImmutableList getWarnings();

  /**
   * Sets the percentage of typed expressions.
   */
  void setTypedPercent(double typedPercent);

  /**
   * Gets the percentage of typed expressions.
   */
  double getTypedPercent();

  /**
   * Returns if the error manager has errors that should make compilation halt.
   * This, for example, omits errors that were promoted from warnings by using the --strict flag.
   */
  default boolean hasHaltingErrors() {
    if (getErrorCount() == 0) {
      return false;
    }
    for (JSError error : getErrors()) {
       if (error.getType().level == CheckLevel.ERROR) {
         return true;
       }
    }
    return false;
  }

  /**
   * Return true if the conformance violation should be reported. This is called even if the
   * violation is whitelisted.
   */
  default boolean shouldReportConformanceViolation(
      Requirement requirement, Optional whitelistEntry, JSError diagnostic) {
    return true;
  }
}