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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.hierarchy.call;

import com.google.common.collect.Lists;
import com.intellij.find.findUsages.FindUsagesHandler;
import com.intellij.find.findUsages.FindUsagesOptions;
import com.intellij.psi.PsiElement;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.usageView.UsageInfo;
import com.intellij.util.ArrayUtil;
import com.intellij.util.CommonProcessors;
import com.jetbrains.python.findUsages.PyClassFindUsagesHandler;
import com.jetbrains.python.findUsages.PyFunctionFindUsagesHandler;
import com.jetbrains.python.psi.*;
import com.jetbrains.python.psi.resolve.PyResolveContext;
import com.jetbrains.python.psi.search.PySuperMethodsSearch;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.Collection;
import java.util.List;

/**
 * @author novokrest
 */
public class PyStaticCallHierarchyUtil {
  public static Collection getCallees(@NotNull PyElement element) {
    final List callees = Lists.newArrayList();

    final PyRecursiveElementVisitor visitor = new PyRecursiveElementVisitor() {
      @Override
      public void visitPyParameterList(PyParameterList node) {
      }

      @Override
      public void visitPyLambdaExpression(PyLambdaExpression node) {
      }

      @Override
      public void visitPyFunction(PyFunction innerFunction) {
        for (PyParameter parameter : innerFunction.getParameterList().getParameters()) {
          PsiElement defaultValue = parameter.getDefaultValue();
          if (defaultValue != null) {
            defaultValue.accept(this);
          }
        }
      }

      @Override
      public void visitPyCallExpression(PyCallExpression callExpression) {
        super.visitPyCallExpression(callExpression);
        PsiElement calleeFunction = callExpression.resolveCalleeFunction(PyResolveContext.defaultContext());
        if (calleeFunction instanceof PyFunction) {
          callees.add(calleeFunction);
        }
      }
    };

    visitor.visitElement(element);

    return callees;
  }

  public static Collection getCallers(@NotNull PyElement pyElement) {
    final List callers = Lists.newArrayList();
    final Collection usages = findUsages(pyElement);

    for (UsageInfo usage : usages) {
      PsiElement element = usage.getElement();
      if (element == null) {
        continue;
      }

      element = element.getParent();
      while (element instanceof PyParenthesizedExpression) {
        element = element.getParent();
      }

      if (element instanceof PyCallExpression) {
        PsiElement caller = PsiTreeUtil.getParentOfType(element, PyParameterList.class, PyFunction.class);
        if (caller instanceof PyFunction) {
          callers.add(caller);
        }
        else if (caller instanceof PyParameterList) {
          PsiElement innerFunction = PsiTreeUtil.getParentOfType(caller, PyFunction.class);
          PsiElement outerFunction = PsiTreeUtil.getParentOfType(innerFunction, PyFunction.class);
          if (innerFunction != null && outerFunction != null) {
            callers.add(outerFunction);
          }
        }
      }
    }

    return callers;
  }

  private static Collection findUsages(@NotNull final PsiElement element) {
    final FindUsagesHandler handler = createFindUsageHandler(element);
    if (handler == null) {
      return Lists.newArrayList();
    }
    final CommonProcessors.CollectProcessor processor = new CommonProcessors.CollectProcessor();
    final PsiElement[] psiElements = ArrayUtil.mergeArrays(handler.getPrimaryElements(), handler.getSecondaryElements());
    final FindUsagesOptions options = handler.getFindUsagesOptions(null);
    for (PsiElement psiElement : psiElements) {
      handler.processElementUsages(psiElement, processor, options);
    }
    return processor.getResults();
  }

  /**
   * @see {@link com.jetbrains.python.findUsages.PyFindUsagesHandlerFactory#createFindUsagesHandler(com.intellij.psi.PsiElement, boolean) createFindUsagesHandler}
   */
  @Nullable
  private static FindUsagesHandler createFindUsageHandler(@NotNull final PsiElement element) {
    if (element instanceof PyFunction) {
      final Collection superMethods = PySuperMethodsSearch.search((PyFunction)element, true).findAll();
      if (superMethods.size() > 0) {
        final PsiElement next = superMethods.iterator().next();
        if (next instanceof PyFunction && !isInObject((PyFunction)next)) {
          List allMethods = Lists.newArrayList();
          allMethods.add(element);
          allMethods.addAll(superMethods);

          return new PyFunctionFindUsagesHandler(element, allMethods);
        }
      }
      return new PyFunctionFindUsagesHandler(element);
    }
    if (element instanceof PyClass) {
      return new PyClassFindUsagesHandler((PyClass)element);
    }
    return null;
  }

  /**
   * @see {@link com.jetbrains.python.findUsages.PyFindUsagesHandlerFactory#isInObject(com.jetbrains.python.psi.PyFunction) isInObject}
   */
  private static boolean isInObject(PyFunction fun) {
    final PyClass containingClass = fun.getContainingClass();
    if (containingClass == null) {
      return false;
    }
    return PyUtil.isObjectClass(containingClass);
  }
}