/*
 * Copyright 2016 The Bazel Authors. All rights reserved.
 *
 * 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.idea.blaze.base.lang.buildfile.language.semantics;

import com.intellij.openapi.components.ServiceManager;
import com.intellij.openapi.project.Project;

import javax.annotation.Nullable;

/**
 * Provides a BuildLanguageSpec for the given project.
 */
public interface BuildLanguageSpecProvider {

  static BuildLanguageSpecProvider getInstance() {
    return ServiceManager.getService(BuildLanguageSpecProvider.class);
  }

  /**
   * Returns null if cancelled or unsuccessful. Also returns null if no WorkspaceRoot can be found for the
   * project (i.e. because BlazeImportSettings has not been set).
   */
  @Nullable
  BuildLanguageSpec getLanguageSpec(Project project);

}