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Implement new detector IRA_INEFFICIENT_REPLACEALL. Finds occurrences of replaceAll(String regex, String replacement) without any special regex characters.
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spotbugs-tests/src/test/java/edu/umd/cs/findbugs/ba/Issue705Test.java
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| /* | ||
| * Contributions to SpotBugs | ||
| * Copyright (C) 2018, kengo | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2.1 of the License, or (at your option) any later version. | ||
| * | ||
| * This library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this library; if not, write to the Free Software | ||
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| */ | ||
| package edu.umd.cs.findbugs.ba; | ||
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| import static edu.umd.cs.findbugs.test.CountMatcher.containsExactly; | ||
| import static org.junit.Assert.assertThat; | ||
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| import org.junit.Test; | ||
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| import edu.umd.cs.findbugs.AbstractIntegrationTest; | ||
| import edu.umd.cs.findbugs.SortedBugCollection; | ||
| import edu.umd.cs.findbugs.test.matcher.BugInstanceMatcher; | ||
| import edu.umd.cs.findbugs.test.matcher.BugInstanceMatcherBuilder; | ||
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| public class Issue705Test extends AbstractIntegrationTest { | ||
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| @Test | ||
| public void test() { | ||
| performAnalysis("ghIssues/Issue705.class"); | ||
| final BugInstanceMatcher bugTypeMatcher = new BugInstanceMatcherBuilder() | ||
| .bugType("IRA_INEFFICIENT_REPLACEALL").build(); | ||
| SortedBugCollection bugCollection = (SortedBugCollection) getBugCollection(); | ||
| assertThat(bugCollection, containsExactly(1, bugTypeMatcher)); | ||
| } | ||
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| } |
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149 changes: 149 additions & 0 deletions
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spotbugs/src/main/java/edu/umd/cs/findbugs/detect/InefficientReplaceAll.java
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| /* | ||
| * FindBugs - Find bugs in Java programs | ||
| * Copyright (C) 2004 Dave Brosius <[email protected]> | ||
| * Copyright (C) 2004 University of Maryland | ||
| * | ||
| * This library is free software; you can redistribute it and/or | ||
| * modify it under the terms of the GNU Lesser General Public | ||
| * License as published by the Free Software Foundation; either | ||
| * version 2.1 of the License, or (at your option) any later version. | ||
| * | ||
| * This library is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| * Lesser General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU Lesser General Public | ||
| * License along with this library; if not, write to the Free Software | ||
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
| */ | ||
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| package edu.umd.cs.findbugs.detect; | ||
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| import java.util.ArrayList; | ||
| import java.util.Collections; | ||
| import java.util.List; | ||
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| import org.apache.bcel.Const; | ||
| import org.apache.bcel.classfile.Code; | ||
| import org.apache.bcel.classfile.Method; | ||
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| import edu.umd.cs.findbugs.BugAccumulator; | ||
| import edu.umd.cs.findbugs.BugInstance; | ||
| import edu.umd.cs.findbugs.BugReporter; | ||
| import edu.umd.cs.findbugs.StatelessDetector; | ||
| import edu.umd.cs.findbugs.SystemProperties; | ||
| import edu.umd.cs.findbugs.ba.ClassContext; | ||
| import edu.umd.cs.findbugs.bcel.OpcodeStackDetector; | ||
| import edu.umd.cs.findbugs.classfile.MethodDescriptor; | ||
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| /** | ||
| * Find occurrences of replaceAll(String regex, String replacement) without any special regex characters. | ||
| * | ||
| * @author Lasse Lindqvist | ||
| */ | ||
| public class InefficientReplaceAll extends OpcodeStackDetector implements StatelessDetector { | ||
| private static final boolean DEBUG = SystemProperties.getBoolean("ira.debug"); | ||
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| private static final List<MethodDescriptor> methods = Collections.singletonList(new MethodDescriptor("", "replaceAll", | ||
| "(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;")); | ||
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| private final BugReporter bugReporter; | ||
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| private final BugAccumulator bugAccumulator; | ||
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| private static List<String> regexCharList = new ArrayList<>(); | ||
| static { | ||
| regexCharList.add("."); | ||
| regexCharList.add("\\"); | ||
| regexCharList.add("["); | ||
| regexCharList.add("]"); | ||
| regexCharList.add("{"); | ||
| regexCharList.add("}"); | ||
| regexCharList.add("("); | ||
| regexCharList.add(")"); | ||
| regexCharList.add("<"); | ||
| regexCharList.add(">"); | ||
| regexCharList.add("*"); | ||
| regexCharList.add("+"); | ||
| regexCharList.add("-"); | ||
| regexCharList.add("="); | ||
| regexCharList.add("?"); | ||
| regexCharList.add("^"); | ||
| regexCharList.add("$"); | ||
| regexCharList.add("|"); | ||
| } | ||
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| public InefficientReplaceAll(BugReporter bugReporter) { | ||
| this.bugReporter = bugReporter; | ||
| this.bugAccumulator = new BugAccumulator(bugReporter); | ||
| } | ||
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| @Override | ||
| public void visitClassContext(ClassContext classContext) { | ||
| if (hasInterestingMethod(classContext.getJavaClass().getConstantPool(), methods)) { | ||
| classContext.getJavaClass().accept(this); | ||
| } | ||
| } | ||
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| @Override | ||
| public void visit(Method obj) { | ||
| if (DEBUG) { | ||
| System.out.println("------------------- Analyzing " + obj.getName() + " ----------------"); | ||
| } | ||
| super.visit(obj); | ||
| } | ||
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| @Override | ||
| public void visit(Code obj) { | ||
| super.visit(obj); | ||
| bugAccumulator.reportAccumulatedBugs(); | ||
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| } | ||
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| @Override | ||
| public void sawOpcode(int seen) { | ||
| if (DEBUG) { | ||
| System.out.println("Opcode: " + Const.getOpcodeName(seen)); | ||
| } | ||
| if (((seen == Const.INVOKEVIRTUAL) || (seen == Const.INVOKEINTERFACE)) && ("replaceAll".equals(getNameConstantOperand())) | ||
| && ("(Ljava/lang/String;Ljava/lang/String;)Ljava/lang/String;".equals(getSigConstantOperand())) | ||
| && hasConstantArguments()) { | ||
| String firstArgument = getFirstArgument(); | ||
| boolean found = false; | ||
| for (String regexChar : regexCharList) { | ||
| if (firstArgument.contains(String.valueOf(regexChar))) { | ||
| found = true; | ||
| break; | ||
| } | ||
| } | ||
| if (!found) { | ||
| bugAccumulator.accumulateBug( | ||
| new BugInstance(this, "IRA_INEFFICIENT_REPLACEALL", LOW_PRIORITY).addClassAndMethod(this), this); | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * @return first argument of the called method if it's a constant | ||
| */ | ||
| private String getFirstArgument() { | ||
| Object value = getStack().getStackItem(getNumberArguments(getMethodDescriptorOperand().getSignature()) - 1) | ||
| .getConstant(); | ||
| return value == null ? null : value.toString(); | ||
| } | ||
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| /** | ||
| * @return true if only constants are passed to the called method | ||
| */ | ||
| private boolean hasConstantArguments() { | ||
| int nArgs = getNumberArguments(getMethodDescriptorOperand().getSignature()); | ||
| for (int i = 0; i < nArgs; i++) { | ||
| if (getStack().getStackItem(i).getConstant() == null) { | ||
| return false; | ||
| } | ||
| } | ||
| return true; | ||
| } | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,25 @@ | ||
| package ghIssues; | ||
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| public class Issue705 { | ||
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| public static String bug() { | ||
| String replaceable = "replaceable"; | ||
| String replacement = "replacement"; | ||
| String target = "target"; | ||
| return target.replaceAll(replaceable, replacement); | ||
| } | ||
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| public static String nonBug() { | ||
| String replaceable = "(replaceable)"; | ||
| String replacement = "replacement"; | ||
| String target = "target"; | ||
| return target.replaceAll(replaceable, replacement); | ||
| } | ||
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| public static String nonBug2() { | ||
| String replaceable = "(.*replaceable)"; | ||
| String replacement = "replacement"; | ||
| String target = "target"; | ||
| return target.replaceAll(replaceable, replacement); | ||
| } | ||
| } |