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A packaging of the IntelliJ Community Edition python-community library. This is release number 1 of trunk branch 142.

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/*
 * 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 com.jetbrains.python.codeInsight;

import com.intellij.codeInsight.TargetElementEvaluator;
import com.intellij.codeInsight.TargetElementUtil;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiReference;
import com.intellij.psi.util.PsiTreeUtil;
import com.jetbrains.python.codeInsight.controlflow.ScopeOwner;
import com.jetbrains.python.psi.PyParameter;
import com.jetbrains.python.psi.PyReferenceExpression;
import com.jetbrains.python.psi.PyReferenceOwner;
import com.jetbrains.python.psi.PyTargetExpression;
import com.jetbrains.python.psi.resolve.PyResolveContext;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.HashSet;
import java.util.Set;

/**
 * @author yole
 */
public class PyTargetElementEvaluator implements TargetElementEvaluator {
  @Override
  public boolean includeSelfInGotoImplementation(@NotNull PsiElement element) {
    return false;
  }

  @Nullable
  @Override
  public PsiElement getElementByReference(@NotNull PsiReference ref, int flags) {
    if ((flags & TargetElementUtil.ELEMENT_NAME_ACCEPTED) == 0){
      return null;
    }
    final PsiElement element = ref.getElement();
    PsiElement result = ref.resolve();
    Set visited = new HashSet();
    visited.add(result);
    while (result instanceof PyReferenceOwner && (result instanceof PyReferenceExpression || result instanceof PyTargetExpression)) {
      PsiElement nextResult = ((PyReferenceOwner)result).getReference(PyResolveContext.noImplicits()).resolve();
      if (nextResult != null && !visited.contains(nextResult) &&
          PsiTreeUtil.getParentOfType(element, ScopeOwner.class) == PsiTreeUtil.getParentOfType(result, ScopeOwner.class) &&
          (nextResult instanceof PyReferenceExpression || nextResult instanceof PyTargetExpression || nextResult instanceof PyParameter)) {
        visited.add(nextResult);
        result = nextResult;
      }
      else {
        break;
      }
    }
    return result;
  }
}