BnfStringRefContributor.java

/*
 * Copyright 2011-present Greg Shrago
 *
 * 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.grammar.psi.impl;

import com.intellij.patterns.PatternCondition;
import com.intellij.psi.*;
import com.intellij.util.ProcessingContext;
import com.intellij.util.containers.ContainerUtil;
import org.intellij.grammar.KnownAttribute;
import org.intellij.grammar.java.JavaHelper;
import org.intellij.grammar.psi.BnfAttr;
import org.intellij.grammar.psi.BnfAttrPattern;
import org.jetbrains.annotations.NotNull;

import java.util.Set;

import static com.intellij.patterns.PlatformPatterns.*;
import static org.intellij.grammar.KnownAttribute.*;

/**
 * @author gregsh
 */
public class BnfStringRefContributor extends PsiReferenceContributor {

  private static final Set<KnownAttribute> RULE_ATTRIBUTES = ContainerUtil.newHashSet(
    EXTENDS, IMPLEMENTS, RECOVER_WHILE, NAME);

  private static final Set<KnownAttribute> JAVA_CLASS_ATTRIBUTES = ContainerUtil.newHashSet(
    EXTENDS, IMPLEMENTS, MIXIN);

  @Override
  public void registerReferenceProviders(@NotNull PsiReferenceRegistrar registrar) {
    registrar.registerReferenceProvider(
      psiElement(BnfStringImpl.class).withParent(psiElement(BnfAttrPattern.class)), new PsiReferenceProvider() {

        @NotNull
        @Override
        public PsiReference[] getReferencesByElement(@NotNull PsiElement element, @NotNull ProcessingContext context) {
          return new PsiReference[]{BnfStringImpl.createPatternReference((BnfStringImpl)element)};
        }
      }
    );

    registrar.registerReferenceProvider(
      psiElement(BnfStringImpl.class).withParent(psiElement(BnfAttr.class).withName(string().with(oneOf(RULE_ATTRIBUTES)))),
      new PsiReferenceProvider() {

        @NotNull
        @Override
        public PsiReference[] getReferencesByElement(@NotNull PsiElement element, @NotNull ProcessingContext context) {
          return new PsiReference[]{BnfStringImpl.createRuleReference((BnfStringImpl)element)};
        }
      }
    );

    registrar.registerReferenceProvider(
      psiElement(BnfStringImpl.class).withParent(psiElement(BnfAttr.class).withName(
        or(string().endsWith("Class"), string().endsWith("Package"), string().with(oneOf(JAVA_CLASS_ATTRIBUTES))))),
      new PsiReferenceProvider() {

        @NotNull
        @Override
        public PsiReference[] getReferencesByElement(@NotNull PsiElement element, @NotNull ProcessingContext context) {
          PsiReferenceProvider provider = JavaHelper.getJavaHelper(element).getClassReferenceProvider();
          return provider == null ? PsiReference.EMPTY_ARRAY : provider.getReferencesByElement(element, new ProcessingContext());
        }
      });
  }

  private static PatternCondition<String> oneOf(final Set<KnownAttribute> attributes) {
    return new PatternCondition<String>("oneOf") {
      @Override
      public boolean accepts(@NotNull String s, ProcessingContext context) {
        return attributes.contains(KnownAttribute.getCompatibleAttribute(s));
      }
    };
  }
}