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Move check for the regex "." to a new WARNING-level check
PiperOrigin-RevId: 406904784
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78
core/src/main/java/com/google/errorprone/bugpatterns/AbstractPatternSyntaxChecker.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /* | ||
| * Copyright 2021 The Error Prone Authors. | ||
| * | ||
| * 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.google.errorprone.bugpatterns; | ||
|
|
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| import static com.google.errorprone.matchers.Description.NO_MATCH; | ||
| import static com.google.errorprone.matchers.Matchers.anyOf; | ||
| import static com.google.errorprone.matchers.Matchers.instanceMethod; | ||
| import static com.google.errorprone.matchers.Matchers.staticMethod; | ||
|
|
||
| import com.google.errorprone.VisitorState; | ||
| import com.google.errorprone.annotations.ForOverride; | ||
| import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher; | ||
| import com.google.errorprone.matchers.Description; | ||
| import com.google.errorprone.matchers.Matcher; | ||
| import com.google.errorprone.util.ASTHelpers; | ||
| import com.sun.source.tree.ExpressionTree; | ||
| import com.sun.source.tree.MethodInvocationTree; | ||
| import javax.annotation.CheckReturnValue; | ||
|
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| /** Finds calls to regex-accepting methods with literal strings. */ | ||
| @CheckReturnValue | ||
| abstract class AbstractPatternSyntaxChecker extends BugChecker | ||
| implements MethodInvocationTreeMatcher { | ||
|
|
||
| /* | ||
| * Match invocations to regex-accepting methods. Subclasses will be consulted to see whether the | ||
| * pattern passed to such methods are acceptable. | ||
| * | ||
| * <p>We deliberately omit Pattern.compile itself, as most of its users appear to be either | ||
| * e.g. passing LITERAL flags or deliberately testing the regex compiler. | ||
| */ | ||
| private static final Matcher<MethodInvocationTree> REGEX_USAGE = | ||
| anyOf( | ||
| instanceMethod() | ||
| .onExactClass("java.lang.String") | ||
| .namedAnyOf("matches", "split") | ||
| .withParameters("java.lang.String"), | ||
| instanceMethod() | ||
| .onExactClass("java.lang.String") | ||
| .named("split") | ||
| .withParameters("java.lang.String", "int"), | ||
| instanceMethod() | ||
| .onExactClass("java.lang.String") | ||
| .namedAnyOf("replaceFirst", "replaceAll") | ||
| .withParameters("java.lang.String", "java.lang.String"), | ||
| staticMethod().onClass("java.util.regex.Pattern").named("matches"), | ||
| staticMethod().onClass("com.google.common.base.Splitter").named("onPattern")); | ||
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| @Override | ||
| public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) { | ||
| if (!REGEX_USAGE.matches(tree, state)) { | ||
| return NO_MATCH; | ||
| } | ||
| ExpressionTree arg = tree.getArguments().get(0); | ||
| String value = ASTHelpers.constValue(arg, String.class); | ||
| if (value == null) { | ||
| return NO_MATCH; | ||
| } | ||
| return matchRegexLiteral(tree, value); | ||
| } | ||
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| @ForOverride | ||
| protected abstract Description matchRegexLiteral(MethodInvocationTree tree, String pattern); | ||
| } |
48 changes: 48 additions & 0 deletions
48
core/src/main/java/com/google/errorprone/bugpatterns/BareDotMetacharacter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,48 @@ | ||
| /* | ||
| * Copyright 2021 The Error Prone Authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.google.errorprone.bugpatterns; | ||
|
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| import static com.google.errorprone.BugPattern.SeverityLevel.WARNING; | ||
| import static com.google.errorprone.matchers.Description.NO_MATCH; | ||
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| import com.google.errorprone.BugPattern; | ||
| import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher; | ||
| import com.google.errorprone.fixes.SuggestedFix; | ||
| import com.google.errorprone.matchers.Description; | ||
| import com.sun.source.tree.MethodInvocationTree; | ||
|
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| /** A BugChecker; see the associated BugPattern for details. */ | ||
| @BugPattern( | ||
| name = "BareDotMetacharacter", | ||
| summary = | ||
| "\".\" is rarely useful as a regex, as it matches any character. To match a literal '.'" | ||
| + " character, instead write \"\\.\".", | ||
| severity = WARNING, | ||
| // So that suppressions added before this check was split into two apply to both halves. | ||
| altNames = {"InvalidPatternSyntax"}) | ||
| public class BareDotMetacharacter extends AbstractPatternSyntaxChecker | ||
| implements MethodInvocationTreeMatcher { | ||
|
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| @Override | ||
| protected final Description matchRegexLiteral(MethodInvocationTree tree, String regex) { | ||
| if (regex.equals(".")) { | ||
| return describeMatch(tree, SuggestedFix.replace(tree.getArguments().get(0), "\"\\\\.\"")); | ||
| } else { | ||
| return NO_MATCH; | ||
| } | ||
| } | ||
| } |
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54 changes: 54 additions & 0 deletions
54
core/src/test/java/com/google/errorprone/bugpatterns/BareDotMetacharacterTest.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,54 @@ | ||
| /* | ||
| * Copyright 2012 The Error Prone Authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package com.google.errorprone.bugpatterns; | ||
|
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| import com.google.errorprone.BugCheckerRefactoringTestHelper; | ||
| import org.junit.Test; | ||
| import org.junit.runner.RunWith; | ||
| import org.junit.runners.JUnit4; | ||
|
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| /** Tests for {@link BareDotMetacharacter}. */ | ||
| @RunWith(JUnit4.class) | ||
| public class BareDotMetacharacterTest { | ||
|
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| private final BugCheckerRefactoringTestHelper refactoringHelper = | ||
| BugCheckerRefactoringTestHelper.newInstance(BareDotMetacharacter.class, getClass()); | ||
|
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| @Test | ||
| public void testPositiveCase() { | ||
| refactoringHelper | ||
| .addInputLines( | ||
| "Test.java", | ||
| "import com.google.common.base.Splitter;", | ||
| "class Test {", | ||
| " private static final String DOT = \".\";", | ||
| " Object x = \"foo.bar\".split(\".\");", | ||
| " Object y = \"foo.bonk\".split(DOT);", | ||
| " Object z = Splitter.onPattern(\".\");", | ||
| "}") | ||
| .addOutputLines( | ||
| "Test.java", | ||
| "import com.google.common.base.Splitter;", | ||
| "class Test {", | ||
| " private static final String DOT = \".\";", | ||
| " Object x = \"foo.bar\".split(\"\\\\.\");", | ||
| " Object y = \"foo.bonk\".split(\"\\\\.\");", | ||
| " Object z = Splitter.onPattern(\"\\\\.\");", | ||
| "}") | ||
| .doTest(); | ||
| } | ||
| } |
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