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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 2015 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.refactoring;

import static com.google.javascript.jscomp.ClosureCheckModule.REFERENCE_TO_SHORT_IMPORT_BY_LONG_NAME_INCLUDING_SHORT_NAME;
import static com.google.javascript.jscomp.lint.CheckExtraRequires.EXTRA_REQUIRE_WARNING;

import com.google.common.collect.ArrayListMultimap;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.ListMultimap;
import com.google.javascript.jscomp.AbstractCompiler;
import com.google.javascript.jscomp.BasicErrorManager;
import com.google.javascript.jscomp.CheckLevel;
import com.google.javascript.jscomp.DiagnosticType;
import com.google.javascript.jscomp.JSError;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashMap;
import java.util.List;

/**
 * An error manager that finds a SuggestedFix for all errors if possible.
 */
public class FixingErrorManager extends BasicErrorManager {
  private ErrorToFixMapper fixer;
  private final HashMap sureFixes = new HashMap<>();
  private final ListMultimap multiFixes = ArrayListMultimap.create();
  private final ImmutableSet unfixableErrors;

  private enum FixTypes {
    ONE_FIX,
    ONE_FIX_AND_MULTI_FIXES,
  }

  public FixingErrorManager() {
    this(ImmutableSet.of());
  }

  public FixingErrorManager(ImmutableSet unfixableErrors) {
    this.unfixableErrors = unfixableErrors;
  }

  public void setCompiler(AbstractCompiler compiler) {
    this.fixer = new ErrorToFixMapper(compiler);
  }

  @Override
  public void report(CheckLevel level, JSError error) {
    super.report(level, error);
    if (!unfixableErrors.contains(error.getType())) {
      ImmutableList fixes = this.fixer.getFixesForJsError(error);
      if (fixes.size() == 1) {
        sureFixes.put(error, fixes.get(0));
      } else {
        multiFixes.putAll(error, fixes);
      }
    }
  }

  private boolean containsFixableShorthandModuleWarning() {
    for (JSError error : sureFixes.keySet()) {
      if (error.getType().equals(REFERENCE_TO_SHORT_IMPORT_BY_LONG_NAME_INCLUDING_SHORT_NAME)) {
        return true;
      }
    }
    for (JSError error : multiFixes.keySet()) {
      if (error.getType().equals(REFERENCE_TO_SHORT_IMPORT_BY_LONG_NAME_INCLUDING_SHORT_NAME)) {
        return true;
      }
    }
    return false;
  }

  public List getFixesForJsError(JSError error) {
    if (sureFixes.containsKey(error)) {
      return ImmutableList.of(sureFixes.get(error));
    } else {
      return multiFixes.get(error);
    }
  }

  private Collection getFixes(FixTypes fixTypes) {
    boolean containsFixableShorthandModuleWarning = containsFixableShorthandModuleWarning();
    Collection fixes = new ArrayList<>();
    for (JSError error : getErrors()) {
      // Sometimes code will produce a spurious extra-require error,
      // as well as a warning about using a full namespace instead of a shorthand type. In this case
      // don't apply the extra require fix.
      if (containsFixableShorthandModuleWarning && error.getType().equals(EXTRA_REQUIRE_WARNING)) {
        // Don't apply this fix.
      } else {
        if (fixTypes == FixTypes.ONE_FIX && sureFixes.containsKey(error)) {
          fixes.add(sureFixes.get(error));
        } else if (fixTypes == FixTypes.ONE_FIX_AND_MULTI_FIXES) {
          fixes.addAll(getFixesForJsError(error));
        }
      }
    }
    for (JSError warning : getWarnings()) {
      if (warning.getType().equals(EXTRA_REQUIRE_WARNING)
          && containsFixableShorthandModuleWarning) {
        // As above, don't apply the extra-require fix.
      } else {
        if (fixTypes == FixTypes.ONE_FIX && sureFixes.containsKey(warning)) {
          fixes.add(sureFixes.get(warning));
        } else if (fixTypes == FixTypes.ONE_FIX_AND_MULTI_FIXES) {
          fixes.addAll(getFixesForJsError(warning));
        }
      }
    }
    return fixes;
  }

  /** Returns fixes for errors and warnings that only have one 'sure' guaranteed fix. */
  public Collection getSureFixes() {
    return getFixes(FixTypes.ONE_FIX);
  }

  /**
   * Returns fixes for errors first, then fixes for warnings. This includes 'sure' fixes with only
   * one option, and 'multi' fixes which have multiple choices.
   */
  public Collection getAllFixes() {
    return getFixes(FixTypes.ONE_FIX_AND_MULTI_FIXES);
  }

  @Override
  public void printSummary() {
    // No-op
  }

  @Override
  public void println(CheckLevel level, JSError error) {
    // No-op
  }
}