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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 2019 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.collect.ImmutableSortedMap.toImmutableSortedMap;
import static java.util.Comparator.naturalOrder;

import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSortedMap;
import com.google.gson.Gson;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;

/** Used to print a map from diagnostic id to suppression. */
@GwtIncompatible
public final class DiagnosticToSuppressionMapper {

  enum OutputFormat {
    MD,
    JSON;
  }

  private final Set validSuppressions;
  private final ImmutableMap diagnosticGroups;

  /**
   * @param validSuppressions the set of diagnostic group names valid to @suppress in code
   * @param diagnosticGroups a map from suppression to {@link DiagnosticGroup}
   */
  DiagnosticToSuppressionMapper(
      Set validSuppressions, ImmutableMap diagnosticGroups) {
    this.validSuppressions = validSuppressions;
    this.diagnosticGroups = diagnosticGroups;
  }

  /** Prints a sorted map of all valid suppressions to System.out */
  void printSuppressions(OutputFormat output) {
    switch (output) {
      case JSON:
        printAsJson(createSuppressionMap());
        break;

      case MD:
        printAsMarkdown(createSuppressionMap());
        break;
    }
  }

  @VisibleForTesting
  ImmutableSortedMap createSuppressionMap() {
    Set validSuppressions = new HashSet<>(this.validSuppressions);
    // deprecated in favor of "visibility"
    validSuppressions.remove("accessControls");

    LinkedHashMap diagnosticToSuppression = new LinkedHashMap<>();

    for (Map.Entry entry : this.diagnosticGroups.entrySet()) {
      String suppression = entry.getKey();
      if (!validSuppressions.contains(suppression)) {
        continue;
      }

      DiagnosticGroup group = entry.getValue();
      for (DiagnosticType diagnosticType : group.getTypes()) {
        diagnosticToSuppression.merge(diagnosticType, suppression, this::preferMoreTargetedGroup);
      }
    }

    return diagnosticToSuppression.entrySet().stream()
        .collect(
            toImmutableSortedMap(
                naturalOrder(), (entrySet) -> entrySet.getKey().key, Map.Entry::getValue));
  }

  /** Use a more targeted suppression if one exists. */
  private String preferMoreTargetedGroup(String next, String current) {
    DiagnosticGroup nextGroup = this.diagnosticGroups.get(next);
    DiagnosticGroup currentGroup = this.diagnosticGroups.get(current);
    return nextGroup.getTypes().size() < currentGroup.getTypes().size() ? next : current;
  }

  private static void printAsJson(ImmutableSortedMap diagnosticToSuppression) {
    System.out.println(new Gson().toJson(diagnosticToSuppression));
  }

  private static void printAsMarkdown(ImmutableSortedMap diagnosticToSuppression) {
    System.out.println("| Error | Suppression tag |");
    System.out.println("|---|---|");

    diagnosticToSuppression.entrySet().stream()
        .map(e -> String.format("|%s|%s|", e.getKey(), e.getValue()))
        .forEachOrdered(System.out::println);
  }
}