UnnecessaryLabelOnContinueStatementInspection.java

/*
 * Copyright 2003-2007 Dave Griffith, Bas Leijdekkers
 *
 * 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.siyeh.ig.controlflow;

import com.intellij.codeInspection.ProblemDescriptor;
import com.intellij.openapi.project.Project;
import com.intellij.psi.*;
import com.intellij.psi.util.PsiTreeUtil;
import com.intellij.util.IncorrectOperationException;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.InspectionGadgetsFix;
import org.jetbrains.annotations.NotNull;

public class UnnecessaryLabelOnContinueStatementInspection
  extends BaseInspection {

  @Override
  @NotNull
  public String getDisplayName() {
    return InspectionGadgetsBundle.message(
      "unnecessary.label.on.continue.statement.display.name");
  }

  @Override
  public boolean isEnabledByDefault() {
    return true;
  }

  @Override
  @NotNull
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message(
      "unnecessary.label.on.continue.statement.problem.descriptor");
  }

  @Override
  public InspectionGadgetsFix buildFix(Object... infos) {
    return new UnnecessaryLabelOnContinueStatementFix();
  }

  private static class UnnecessaryLabelOnContinueStatementFix
    extends InspectionGadgetsFix {

    @Override
    @NotNull
    public String getFamilyName() {
      return InspectionGadgetsBundle.message(
        "unnecessary.label.remove.quickfix");
    }

    @Override
    public void doFix(Project project, ProblemDescriptor descriptor)
      throws IncorrectOperationException {
      final PsiElement continueKeywordElement =
        descriptor.getPsiElement();
      final PsiContinueStatement continueStatement =
        (PsiContinueStatement)continueKeywordElement.getParent();
      final PsiIdentifier labelIdentifier =
        continueStatement.getLabelIdentifier();
      if (labelIdentifier == null) {
        return;
      }
      labelIdentifier.delete();
    }
  }

  @Override
  public BaseInspectionVisitor buildVisitor() {
    return new UnnecessaryLabelOnContinueStatementVisitor();
  }

  private static class UnnecessaryLabelOnContinueStatementVisitor
    extends BaseInspectionVisitor {

    @Override
    public void visitContinueStatement(
      @NotNull PsiContinueStatement statement) {
      final PsiIdentifier labelIdentifier =
        statement.getLabelIdentifier();
      if (labelIdentifier == null) {
        return;
      }
      final String labelText = labelIdentifier.getText();
      if (labelText == null || labelText.length() == 0) {
        return;
      }
      final PsiStatement exitedStatement =
        statement.findContinuedStatement();
      if (exitedStatement == null) {
        return;
      }
      final PsiStatement labelEnabledParent =
        PsiTreeUtil.getParentOfType(statement,
                                    PsiForStatement.class, PsiDoWhileStatement.class,
                                    PsiForeachStatement.class, PsiWhileStatement.class,
                                    PsiSwitchStatement.class);
      if (labelEnabledParent == null) {
        return;
      }
      if (!exitedStatement.equals(labelEnabledParent)) {
        return;
      }
      registerStatementError(statement);
    }
  }
}