platform/lang-api/src/com/intellij/psi/LanguageSubstitutors.java

   1 /*
   2  * Copyright 2000-2009 JetBrains s.r.o.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at
   7  *
   8  * http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16 package com.intellij.psi;
  17
  18 import com.intellij.lang.Language;
  19 import com.intellij.lang.LanguageExtension;
  20 import com.intellij.openapi.project.Project;
  21 import com.intellij.openapi.vfs.VirtualFile;
  22 import org.jetbrains.annotations.NotNull;
  23
  24 /**
  25  * @author peter
  26  */
  27 public final class LanguageSubstitutors extends LanguageExtension<LanguageSubstitutor> {
  28   public static final LanguageSubstitutors INSTANCE = new LanguageSubstitutors();
  29
  30   private LanguageSubstitutors() {
  31     super("com.intellij.lang.substitutor");
  32   }
  33
  34   @NotNull
  35   public Language substituteLanguage(@NotNull Language lang, @NotNull VirtualFile file, @NotNull Project project) {
  36     for (final LanguageSubstitutor substitutor : forKey(lang)) {
  37       final Language language = substitutor.getLanguage(file, project);
  38       if (language != null) return language;
  39     }
  40     return lang;
  41   }
  42 }