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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 2008 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.base.Tri;
import org.jspecify.nullness.Nullable;

/** Sets the level for a particular DiagnosticGroup. */
public final class DiagnosticGroupWarningsGuard extends WarningsGuard {
  private static final long serialVersionUID = 1L;

  private final DiagnosticGroup group;
  private final CheckLevel level;

  public DiagnosticGroupWarningsGuard(
      DiagnosticGroup group, CheckLevel level) {
    this.group = group;
    this.level = level;
  }

  @Override
  public @Nullable CheckLevel level(JSError error) {
    return this.group.matches(error) ? this.level : null;
  }

  @Override
  public Tri mustRunChecks(DiagnosticGroup otherGroup) {
    if (this.level.isOn()) {
      return otherGroup.getTypes().stream().anyMatch(this.group::matches) ? Tri.TRUE : Tri.UNKNOWN;
    } else {
      return otherGroup.getTypes().stream().allMatch(this.group::matches) ? Tri.FALSE : Tri.UNKNOWN;
    }
  }

  @Override
  public String toString() {
    return group + "(" + level + ")";
  }
}