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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 2000-2015 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.refactoring.invertBoolean;

import com.intellij.openapi.util.Ref;
import com.intellij.psi.*;
import com.intellij.psi.search.searches.ReferencesSearch;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.refactoring.BaseRefactoringProcessor;
import com.intellij.refactoring.rename.RenameProcessor;
import com.intellij.refactoring.rename.RenameUtil;
import com.intellij.refactoring.util.MoveRenameUsageInfo;
import com.intellij.usageView.UsageInfo;
import com.intellij.usageView.UsageViewDescriptor;
import com.intellij.util.IncorrectOperationException;
import com.intellij.util.containers.HashMap;
import com.jetbrains.python.PyNames;
import com.jetbrains.python.PyTokenTypes;
import com.jetbrains.python.psi.*;
import org.jetbrains.annotations.NotNull;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

/**
 * User : ktisha
 */
public class PyInvertBooleanProcessor extends BaseRefactoringProcessor {
  private PsiElement myElement;
  private String myNewName;
  private final RenameProcessor myRenameProcessor;
  private final Map myToInvert = new HashMap();
  private final SmartPointerManager mySmartPointerManager;

  public PyInvertBooleanProcessor(@NotNull final PsiElement namedElement, @NotNull final String newName) {
    super(namedElement.getProject());
    myElement = namedElement;
    myNewName = newName;
    mySmartPointerManager = SmartPointerManager.getInstance(myProject);
    myRenameProcessor = new RenameProcessor(myProject, namedElement, newName, false, false);
  }

  @Override
  @NotNull
  protected UsageViewDescriptor createUsageViewDescriptor(@NotNull UsageInfo[] usages) {
    return new PyInvertBooleanUsageViewDescriptor(myElement);
  }

  @Override
  protected boolean preprocessUsages(@NotNull Ref refUsages) {
    if (!myNewName.equals(myElement instanceof PsiNamedElement ? ((PsiNamedElement)myElement).getName() : myElement.getText())) {
      if (myRenameProcessor.preprocessUsages(refUsages)) {
        prepareSuccessful();
        return true;
      }
      return false;
    }
    prepareSuccessful();
    return true;
  }

  @Override
  @NotNull
  protected UsageInfo[] findUsages() {
    final List toInvert = new ArrayList();

    addRefsToInvert(toInvert, myElement);

    final UsageInfo[] renameUsages = myRenameProcessor.findUsages();

    final Map expressionsToUsages = new HashMap();
    final List result = new ArrayList();
    for (UsageInfo renameUsage : renameUsages) {
      expressionsToUsages.put(renameUsage.getElement(), renameUsage);
      result.add(renameUsage);
    }

    for (SmartPsiElementPointer pointer : toInvert) {
      final PyExpression expression = (PyExpression)pointer.getElement();
      if (!expressionsToUsages.containsKey(expression) && expression != null) {
        final UsageInfo usageInfo = new UsageInfo(expression);
        expressionsToUsages.put(expression, usageInfo);
        result.add(usageInfo);
        myToInvert.put(usageInfo, pointer);
      } else {
        myToInvert.put(expressionsToUsages.get(expression), pointer);
      }
    }

    return result.toArray(new UsageInfo[result.size()]);
  }

  private void addRefsToInvert(@NotNull final List toInvert, @NotNull final PsiElement psiElement) {
    final Collection refs = ReferencesSearch.search(psiElement).findAll();

    for (PsiReference ref : refs) {
      final PsiElement element = ref.getElement();
      if (element instanceof PyTargetExpression) {
        final PyTargetExpression target = (PyTargetExpression)element;
        final PyAssignmentStatement parent = PsiTreeUtil.getParentOfType(target, PyAssignmentStatement.class);
        if (parent != null && parent.getTargets().length == 1) {
          final PyExpression value = parent.getAssignedValue();
          if (value != null)
            toInvert.add(mySmartPointerManager.createSmartPsiElementPointer(value));
        }
      }
      else if (element.getParent() instanceof PyPrefixExpression) {
        toInvert.add(mySmartPointerManager.createSmartPsiElementPointer(element.getParent()));
      }
      else if (element instanceof PyReferenceExpression) {
        final PyReferenceExpression refExpr = (PyReferenceExpression)element;
        toInvert.add(mySmartPointerManager.createSmartPsiElementPointer(refExpr));
      }
    }
    if (psiElement instanceof PyNamedParameter) {
      final PyExpression defaultValue = ((PyNamedParameter)psiElement).getDefaultValue();
      if (defaultValue != null)
        toInvert.add(mySmartPointerManager.createSmartPsiElementPointer(defaultValue));
    }
  }

  @NotNull
  private static UsageInfo[] extractUsagesForElement(@NotNull final PsiElement element, @NotNull final UsageInfo[] usages) {
    final ArrayList extractedUsages = new ArrayList(usages.length);
    for (UsageInfo usage : usages) {
      if (usage instanceof MoveRenameUsageInfo) {
        MoveRenameUsageInfo usageInfo = (MoveRenameUsageInfo)usage;
        if (element.equals(usageInfo.getReferencedElement())) {
          extractedUsages.add(usageInfo);
        }
      }
    }
    return extractedUsages.toArray(new UsageInfo[extractedUsages.size()]);
  }


  @Override
  protected void performRefactoring(@NotNull UsageInfo[] usages) {
    for (final PsiElement element : myRenameProcessor.getElements()) {
      try {
        RenameUtil.doRename(element, myRenameProcessor.getNewName(element), extractUsagesForElement(element, usages), myProject, null);
      }
      catch (final IncorrectOperationException e) {
        RenameUtil.showErrorMessage(e, element, myProject);
        return;
      }
    }
    for (UsageInfo usage : usages) {
      final SmartPsiElementPointer pointerToInvert = myToInvert.get(usage);
      if (pointerToInvert != null) {
        PsiElement expression = pointerToInvert.getElement();
        if (expression != null && PsiTreeUtil.getParentOfType(expression, PyImportStatementBase.class, false) == null) {
          final PyExpression replacement = invertExpression(expression);
          expression.replace(replacement);
        }
      }
    }
  }

  @NotNull
  private PyExpression invertExpression(@NotNull final PsiElement expression) {
    final PyElementGenerator elementGenerator = PyElementGenerator.getInstance(myProject);
    if (expression instanceof PyBoolLiteralExpression) {
      final String value = ((PyBoolLiteralExpression)expression).getValue() ? PyNames.FALSE : PyNames.TRUE;
      return elementGenerator.createExpressionFromText(LanguageLevel.forElement(expression), value);
    }
    if (expression instanceof PyReferenceExpression && (PyNames.FALSE.equals(expression.getText()) ||
                                                        PyNames.TRUE.equals(expression.getText()))) {

      final String value = PyNames.TRUE.equals(expression.getText()) ? PyNames.FALSE : PyNames.TRUE;
      return elementGenerator.createExpressionFromText(LanguageLevel.forElement(expression), value);
    }
    else if (expression instanceof PyPrefixExpression) {
      if (((PyPrefixExpression)expression).getOperator() == PyTokenTypes.NOT_KEYWORD) {
        final PyExpression operand = ((PyPrefixExpression)expression).getOperand();
        if (operand != null)
          return elementGenerator.createExpressionFromText(LanguageLevel.forElement(expression), operand.getText());
      }
    }
    return elementGenerator.createExpressionFromText(LanguageLevel.forElement(expression), "not " + expression.getText());
  }

  @Override
  protected String getCommandName() {
    return PyInvertBooleanHandler.REFACTORING_NAME;
  }
}