plugins/IntelliLang/src/org/intellij/plugins/intelliLang/inject/DefaultLanguageInjector.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.injection.MultiHostInjector;
import com.intellij.lang.injection.MultiHostRegistrar;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiLanguageInjectionHost;
import com.intellij.util.ArrayUtil;
import org.intellij.plugins.intelliLang.Configuration;
import org.intellij.plugins.intelliLang.inject.config.BaseInjection;
import org.jetbrains.annotations.NotNull;

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

public final class DefaultLanguageInjector implements MultiHostInjector {

  private final Configuration myInjectionConfiguration;
  private final LanguageInjectionSupport[] mySupports;

  public DefaultLanguageInjector(Configuration configuration) {
    myInjectionConfiguration = configuration;
    mySupports = ArrayUtil.toObjectArray(InjectorUtils.getActiveInjectionSupports(), LanguageInjectionSupport.class);
  }

  @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;

    for (LanguageInjectionSupport support : mySupports) {
      if (!support.isApplicableTo(host)) continue;
      if (!support.useDefaultInjector(host)) continue;

      for (BaseInjection injection : myInjectionConfiguration.getInjections(support.getId())) {
        if (!injection.acceptsPsiElement(host)) continue;
        if (!InjectorUtils.registerInjectionSimple(host, injection, support, registrar)) continue;
        return;
      }
    }
  }
}