plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/TemporaryPlacesInjector.java

/*
 * 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 org.intellij.plugins.intelliLang.inject;

import com.intellij.lang.Language;
import com.intellij.lang.injection.MultiHostInjector;
import com.intellij.lang.injection.MultiHostRegistrar;
import com.intellij.openapi.diagnostic.Logger;
import com.intellij.openapi.util.TextRange;
import com.intellij.openapi.util.Trinity;
import com.intellij.psi.*;
import org.jetbrains.annotations.NotNull;

import java.util.Collections;
import java.util.List;

/**
 * @author Gregory.Shrago
 */
public class TemporaryPlacesInjector implements MultiHostInjector {

  public static final Logger LOG = Logger.getInstance("org.intellij.plugins.intelliLang.inject.TemporaryPlacesInjector");

  private final TemporaryPlacesRegistry myRegistry;

  public TemporaryPlacesInjector(TemporaryPlacesRegistry registry) {
    myRegistry = registry;
  }

  @NotNull
  public List<? extends Class<? extends PsiElement>> elementsToInjectIn() {
    return Collections.singletonList(PsiLanguageInjectionHost.class);
  }

  public void getLanguagesToInject(@NotNull final MultiHostRegistrar registrar, @NotNull final PsiElement context) {
    if (!(context instanceof PsiLanguageInjectionHost) || !((PsiLanguageInjectionHost)context).isValidHost()) return;
    PsiLanguageInjectionHost host = (PsiLanguageInjectionHost)context;

    PsiFile containingFile = context.getContainingFile();
    InjectedLanguage injectedLanguage = myRegistry.getLanguageFor(host, containingFile);
    Language language = injectedLanguage != null ? injectedLanguage.getLanguage() : null;
    if (language == null) return;

    final ElementManipulator<PsiLanguageInjectionHost> manipulator = ElementManipulators.getManipulator(host);
    if (manipulator == null) return;
    List<Trinity<PsiLanguageInjectionHost, InjectedLanguage,TextRange>> trinities =
      Collections.singletonList(Trinity.create(host, injectedLanguage, manipulator.getRangeInElement(host)));
    InjectorUtils.registerInjection(language, trinities, containingFile, registrar);
    InjectorUtils.registerSupport(myRegistry.getLanguageInjectionSupport(), false, registrar);
  }

}