plugins/groovy/groovy-psi/src/org/jetbrains/plugins/groovy/configSlurper/ConfigSlurperMapContentProvider.java

/*
 * Copyright 2000-2014 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.jetbrains.plugins.groovy.configSlurper;

import com.intellij.openapi.util.Pair;
import com.intellij.openapi.util.Ref;
import com.intellij.psi.JavaPsiFacade;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiType;
import com.intellij.util.PairConsumer;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.plugins.groovy.extensions.GroovyMapContentProvider;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrExpression;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrMethodCall;
import org.jetbrains.plugins.groovy.lang.psi.api.statements.expressions.GrReferenceExpression;
import org.jetbrains.plugins.groovy.lang.psi.impl.GroovyPsiManager;
import org.jetbrains.plugins.groovy.lang.psi.util.GroovyCommonClassNames;

import java.util.*;

/**
 * @author Sergey Evdokimov
 */
public class ConfigSlurperMapContentProvider extends GroovyMapContentProvider {

  @Nullable
  private static Pair<ConfigSlurperSupport.PropertiesProvider, List<String>> getInfo(@NotNull GrExpression qualifier,
                                                                                     @Nullable PsiElement resolve) {
    if (!GroovyPsiManager.isInheritorCached(qualifier.getType(), GroovyCommonClassNames.GROOVY_UTIL_CONFIG_OBJECT)) {
      return null;
    }

    GrExpression resolvedQualifier = qualifier;
    PsiElement resolveResult = resolve;
    List<String> path = new ArrayList<String>();

    while (resolveResult == null) {
      if (!(resolvedQualifier instanceof GrReferenceExpression)) return null;

      GrReferenceExpression expr = (GrReferenceExpression)resolvedQualifier;
      path.add(expr.getReferenceName());

      resolvedQualifier = expr.getQualifierExpression();
      if (resolvedQualifier instanceof GrReferenceExpression) {
        resolveResult = ((GrReferenceExpression)resolvedQualifier).resolve();
      }
      else if (resolvedQualifier instanceof GrMethodCall) {
        resolveResult = ((GrMethodCall)resolvedQualifier).resolveMethod();
      }
      else {
        return null;
      }
    }

    Collections.reverse(path);

    ConfigSlurperSupport.PropertiesProvider propertiesProvider = null;

    for (ConfigSlurperSupport slurperSupport : ConfigSlurperSupport.EP_NAME.getExtensions()) {
      propertiesProvider = slurperSupport.getConfigSlurperInfo(resolvedQualifier, resolveResult);
      if (propertiesProvider != null) break;
    }

    if (propertiesProvider == null) return null;

    return Pair.create(propertiesProvider, path);
  }

  @Override
  protected Collection<String> getKeyVariants(@NotNull GrExpression qualifier, @Nullable PsiElement resolve) {
    Pair<ConfigSlurperSupport.PropertiesProvider, List<String>> info = getInfo(qualifier, resolve);
    if (info == null) return Collections.emptyList();

    final Set<String> res = new HashSet<String>();

    info.first.collectVariants(info.second, new PairConsumer<String, Boolean>() {
      @Override
      public void consume(String variant, Boolean isFinal) {
        res.add(variant);
      }
    });

    return res;
  }

  @Override
  public PsiType getValueType(@NotNull GrExpression qualifier, @Nullable PsiElement resolve, @NotNull final String key) {
    Pair<ConfigSlurperSupport.PropertiesProvider, List<String>> info = getInfo(qualifier, resolve);
    if (info == null) return null;

    final Ref<Boolean> res = new Ref<Boolean>();

    info.first.collectVariants(info.second, new PairConsumer<String, Boolean>() {
      @Override
      public void consume(String variant, Boolean isFinal) {
        if (variant.equals(key)) {
          res.set(isFinal);
        }
        else if (variant.startsWith(key) && variant.length() > key.length() && variant.charAt(key.length()) == '.') {
          res.set(false);
        }
      }
    });

    if (res.get() != null && !res.get()) {
      return JavaPsiFacade.getElementFactory(qualifier.getProject()).createTypeByFQClassName(GroovyCommonClassNames.GROOVY_UTIL_CONFIG_OBJECT, qualifier.getResolveScope());
    }

    return null;
  }
}