plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/numeric/OctalLiteralInspection.java

/*
 * Copyright 2003-2010 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.numeric;

import com.intellij.psi.*;
import com.siyeh.InspectionGadgetsBundle;
import com.siyeh.ig.BaseInspection;
import com.siyeh.ig.BaseInspectionVisitor;
import com.siyeh.ig.InspectionGadgetsFix;
import org.intellij.lang.annotations.Pattern;
import org.jetbrains.annotations.NonNls;
import org.jetbrains.annotations.NotNull;

public class OctalLiteralInspection extends BaseInspection {
  @Pattern(VALID_ID_PATTERN)
  @Override
  @NotNull
  public String getID() {
    return "OctalInteger";
  }

  @Override
  @NotNull
  public String getDisplayName() {
    return InspectionGadgetsBundle.message("octal.literal.display.name");
  }

  @Override
  @NotNull
  protected String buildErrorString(Object... infos) {
    return InspectionGadgetsBundle.message(
      "octal.literal.problem.descriptor");
  }

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

  @NotNull
  @Override
  protected InspectionGadgetsFix[] buildFixes(Object... infos) {
    return new InspectionGadgetsFix[]{
      new ConvertOctalLiteralToDecimalFix(),
      new RemoveLeadingZeroFix()
    };
  }

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

  private static class OctalLiteralVisitor extends BaseInspectionVisitor {

    @Override
    public void visitLiteralExpression(
      @NotNull PsiLiteralExpression literal) {
      super.visitLiteralExpression(literal);
      final PsiType type = literal.getType();
      if (type == null) {
        return;
      }
      if (!(type.equals(PsiType.INT)
            || type.equals(PsiType.LONG))) {
        return;
      }
      @NonNls final String text = literal.getText();
      if (text.length() == 1) {
        return;
      }
      if (text.charAt(0) != '0') {
        return;
      }
      final char c1 = text.charAt(1);
      if (c1 != '_' && (c1 < '0' || c1 > '7')) {
        return;
      }
      if (literal.getValue() == null) {
        return;
      }
      registerError(literal);
    }
  }
}