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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.refactoring.introduce.parameter;

import com.intellij.codeInsight.CodeInsightUtilCore;
import com.intellij.psi.PsiElement;
import com.intellij.psi.PsiNamedElement;
import com.intellij.psi.PsiReference;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.refactoring.introduce.inplace.InplaceVariableIntroducer;
import com.jetbrains.python.PyBundle;
import com.jetbrains.python.codeInsight.controlflow.ControlFlowCache;
import com.jetbrains.python.codeInsight.controlflow.ScopeOwner;
import com.jetbrains.python.codeInsight.dataflow.scope.ScopeUtil;
import com.jetbrains.python.psi.*;
import com.jetbrains.python.refactoring.PyReplaceExpressionUtil;
import com.jetbrains.python.refactoring.introduce.IntroduceHandler;
import com.jetbrains.python.refactoring.introduce.IntroduceOperation;
import com.jetbrains.python.refactoring.introduce.variable.VariableValidator;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;

import java.util.LinkedHashSet;
import java.util.List;

/**
 * User: ktisha
 */
public class PyIntroduceParameterHandler extends IntroduceHandler {
  public PyIntroduceParameterHandler() {
    super(new VariableValidator(), PyBundle.message("refactoring.introduce.parameter.dialog.title"));
  }

  @Override
  protected String getHelpId() {
    return "python.reference.introduceParameter";
  }

  @Nullable
  @Override
  protected PsiElement addDeclaration(@NotNull PsiElement expression,
                                      @NotNull PsiElement declaration,
                                      @NotNull IntroduceOperation operation) {
    return doIntroduceParameter(expression, (PyAssignmentStatement)declaration);
  }


  public PsiElement doIntroduceParameter(PsiElement expression, PyAssignmentStatement declaration) {
    PyFunction function = PsiTreeUtil.getParentOfType(expression, PyFunction.class);
    if (function != null && declaration != null) {
      PyParameterList parameterList = function.getParameterList();
      parameterList.addParameter(PyElementGenerator.getInstance(function.getProject()).createParameter(declaration.getText()));
      CodeInsightUtilCore.forcePsiPostprocessAndRestoreElement(function);
      return parameterList.findParameterByName(declaration.getTargets()[0].getText());
    }
    return null;
  }

  @Nullable
  @Override
  protected PsiElement replaceExpression(PsiElement expression, PyExpression newExpression, IntroduceOperation operation) {
    return PyReplaceExpressionUtil.replaceExpression(expression, newExpression);
  }

  protected boolean isValidIntroduceContext(PsiElement element) {
    if (element != null) {
      if (!isValidPlace(element)) return false;

      return isNotDeclared(element);
    }
    return false;
  }

  private static boolean isNotDeclared(PsiElement element) {
    final ScopeOwner scopeOwner =  ScopeUtil.getScopeOwner(element);
    final boolean[] isValid = {true};

    if (scopeOwner != null) {
      final String name = element instanceof PsiNamedElement? ((PsiNamedElement)element).getName() : element.getText();
      if (name != null && ControlFlowCache.getScope(scopeOwner).containsDeclaration(name)) {
        return false;
      }
      new PyRecursiveElementVisitor() {
        @Override
        public void visitPyReferenceExpression(PyReferenceExpression node) {
          super.visitPyReferenceExpression(node);

          final String name = node.getName();
          if (name != null && ControlFlowCache.getScope(scopeOwner).containsDeclaration(name)) {
            isValid[0] = false;
          }
        }
      }.visitElement(element);
    }
    return !isResolvedToParameter(element) && isValid[0];
  }

  private static boolean isValidPlace(PsiElement element) {
    final PyFunction function = PsiTreeUtil.getParentOfType(element, PyFunction.class);
    final PyForPart forPart = PsiTreeUtil.getParentOfType(element, PyForPart.class);
    if (forPart != null) {
      final PyExpression target = forPart.getTarget();
      if (target instanceof PyTargetExpression && element.getText().equals(target.getName()))
        return false;
    }
    final PyStatement nonlocalStatement =
      PsiTreeUtil.getParentOfType(element, PyNonlocalStatement.class, PyGlobalStatement.class);
    final PyStatementList statementList =
      PsiTreeUtil.getParentOfType(element, PyStatementList.class);
    PyImportStatement importStatement = PsiTreeUtil.getParentOfType(element, PyImportStatement.class);
    return nonlocalStatement == null && importStatement == null &&
           statementList != null && function != null;
  }

  private static boolean isResolvedToParameter(PsiElement element) {
    while (element instanceof PyReferenceExpression) {
      final PsiReference reference = element.getReference();
      if (reference != null && reference.resolve() instanceof PyNamedParameter)
        return true;
      element = ((PyReferenceExpression)element).getQualifier();
    }
    return false;
  }

  @Override
  protected void performInplaceIntroduce(IntroduceOperation operation) {
    final PsiElement statement = performRefactoring(operation);
    if (statement instanceof PyNamedParameter) {
      final List occurrences = operation.getOccurrences();
      final PsiElement occurrence = findOccurrenceUnderCaret(occurrences, operation.getEditor());
      PsiElement elementForCaret = occurrence != null ? occurrence : statement;
      operation.getEditor().getCaretModel().moveToOffset(elementForCaret.getTextRange().getStartOffset());
      final InplaceVariableIntroducer introducer =
        new PyInplaceParameterIntroducer((PyNamedParameter)statement, operation, occurrences);
      introducer.performInplaceRefactoring(new LinkedHashSet(operation.getSuggestedNames()));
    }
  }

  private static class PyInplaceParameterIntroducer extends InplaceVariableIntroducer {
    private final PyNamedParameter myTarget;

    public PyInplaceParameterIntroducer(PyNamedParameter target,
                                       IntroduceOperation operation,
                                       List occurrences) {
      super(target, operation.getEditor(), operation.getProject(), "Introduce Parameter",
            occurrences.toArray(new PsiElement[occurrences.size()]), null);
      myTarget = target;
    }

    @Override
    protected PsiElement checkLocalScope() {
      return myTarget.getContainingFile();
    }
  }

  @Override
  protected String getRefactoringId() {
    return "refactoring.python.introduce.parameter";
  }
}