| /* |
| * Copyright 2003-2013 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.style; |
| |
| import com.intellij.psi.PsiLiteralExpression; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| public class ConfusingOctalEscapeInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getID() { |
| return "ConfusingOctalEscapeSequence"; |
| } |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("confusing.octal.escape.sequence.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| return InspectionGadgetsBundle.message("confusing.octal.escape.sequence.problem.descriptor"); |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new ConfusingOctalEscapeVisitor(); |
| } |
| |
| private static class ConfusingOctalEscapeVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitLiteralExpression(@NotNull PsiLiteralExpression expression) { |
| super.visitLiteralExpression(expression); |
| if (!ExpressionUtils.hasStringType(expression)) { |
| return; |
| } |
| final String text = expression.getText(); |
| int escapeStart = -1; |
| while (true) { |
| escapeStart = text.indexOf((int)'\\', escapeStart + 1); |
| if (escapeStart < 0) { |
| return; |
| } |
| if (escapeStart > 0 && text.charAt(escapeStart - 1) == '\\') { |
| continue; |
| } |
| boolean isEscape = true; |
| final int textLength = text.length(); |
| int nextChar = escapeStart + 1; |
| while (nextChar < textLength && text.charAt(nextChar) == '\\') { |
| isEscape = !isEscape; |
| nextChar++; |
| } |
| if (!isEscape) { |
| continue; |
| } |
| escapeStart = nextChar - 1; |
| int length = 1; |
| // see JLS 3.10.6. Escape Sequences for Character and String Literals |
| boolean zeroToThree = false; |
| while (escapeStart + length < textLength) { |
| final char c = text.charAt(escapeStart + length); |
| if (c < '0' || c > '9') { |
| break; |
| } |
| if (length == 1 && (c == '0' || c == '1' || c == '2' || c == '3')) { |
| zeroToThree = true; |
| } |
| if (c == '8' || c == '9' || (length > 2 && !zeroToThree) || length > 3) { |
| registerErrorAtOffset(expression, escapeStart, length); |
| break; |
| } |
| length++; |
| } |
| } |
| } |
| } |
| } |