| /* |
| * 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.bugs; |
| |
| import com.intellij.psi.PsiExpression; |
| import com.intellij.psi.PsiExpressionList; |
| import com.intellij.psi.PsiMethodCallExpression; |
| import com.intellij.psi.PsiReferenceExpression; |
| import com.siyeh.InspectionGadgetsBundle; |
| import com.siyeh.ig.BaseInspection; |
| import com.siyeh.ig.BaseInspectionVisitor; |
| import com.siyeh.ig.psiutils.ExpressionUtils; |
| import com.siyeh.ig.psiutils.MethodCallUtils; |
| import org.jetbrains.annotations.NotNull; |
| |
| import java.util.regex.Pattern; |
| import java.util.regex.PatternSyntaxException; |
| |
| public class MalformedRegexInspection extends BaseInspection { |
| |
| @Override |
| @NotNull |
| public String getDisplayName() { |
| return InspectionGadgetsBundle.message("malformed.regular.expression.display.name"); |
| } |
| |
| @Override |
| @NotNull |
| public String buildErrorString(Object... infos) { |
| if (infos.length == 0) { |
| return InspectionGadgetsBundle.message("malformed.regular.expression.problem.descriptor1"); |
| } |
| else { |
| return InspectionGadgetsBundle.message("malformed.regular.expression.problem.descriptor2", infos[0]); |
| } |
| } |
| |
| @Override |
| public boolean isEnabledByDefault() { |
| return true; |
| } |
| |
| @Override |
| public BaseInspectionVisitor buildVisitor() { |
| return new MalformedRegexVisitor(); |
| } |
| |
| private static class MalformedRegexVisitor extends BaseInspectionVisitor { |
| |
| @Override |
| public void visitMethodCallExpression(@NotNull PsiMethodCallExpression methodCallExpression) { |
| super.visitMethodCallExpression(methodCallExpression); |
| if (!MethodCallUtils.isCallToRegexMethod(methodCallExpression)) { |
| return; |
| } |
| final PsiExpressionList argumentList = methodCallExpression.getArgumentList(); |
| final PsiExpression[] arguments = argumentList.getExpressions(); |
| if (arguments.length == 0) { |
| return; |
| } |
| final PsiExpression firstArgument = arguments[0]; |
| if (!ExpressionUtils.hasStringType(firstArgument)) { |
| return; |
| } |
| final String value = (String)ExpressionUtils.computeConstantExpression(firstArgument); |
| if (value == null) { |
| return; |
| } |
| final PsiReferenceExpression methodExpression = methodCallExpression.getMethodExpression(); |
| if ("compile".equals(methodExpression.getReferenceName()) && arguments.length == 2) { |
| final PsiExpression secondArgument = arguments[1]; |
| final Object flags = ExpressionUtils.computeConstantExpression(secondArgument); |
| if (flags instanceof Integer) { |
| try { |
| Pattern.compile(value, ((Integer)flags).intValue()); |
| } |
| catch (PatternSyntaxException e) { |
| registerError(firstArgument, e.getDescription()); |
| } |
| catch (NullPointerException e) { |
| registerError(firstArgument); |
| } |
| } |
| return; |
| } |
| //noinspection UnusedCatchParameter,ProhibitedExceptionCaught |
| try { |
| Pattern.compile(value); |
| } |
| catch (PatternSyntaxException e) { |
| registerError(firstArgument, e.getDescription()); |
| } |
| catch (NullPointerException e) { |
| registerError(firstArgument); // due to a bug in the sun regex code |
| } |
| } |
| } |
| } |