/*
 * Copyright 2000-2009 JetBrains s.r.o.
 *
 * 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.intellij.psi;

import com.intellij.lang.Language;
import com.intellij.lang.LanguageExtension;
import com.intellij.openapi.project.Project;
import com.intellij.openapi.vfs.VirtualFile;
import org.jetbrains.annotations.NotNull;

/**
 * @author peter
 */
public final class LanguageSubstitutors extends LanguageExtension<LanguageSubstitutor> {
  public static final LanguageSubstitutors INSTANCE = new LanguageSubstitutors();

  private LanguageSubstitutors() {
    super("com.intellij.lang.substitutor");
  }

  @NotNull
  public Language substituteLanguage(@NotNull Language lang, @NotNull VirtualFile file, @NotNull Project project) {
    for (final LanguageSubstitutor substitutor : forKey(lang)) {
      final Language language = substitutor.getLanguage(file, project);
      if (language != null) return language;
    }
    return lang;
  }
}