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/*
* Copyright 2022 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;
import static com.google.errorprone.BugPattern.SeverityLevel.ERROR;
import static com.google.errorprone.matchers.Description.NO_MATCH;
import static com.google.errorprone.matchers.Matchers.instanceMethod;
import static com.google.errorprone.matchers.Matchers.staticMethod;
import static java.lang.String.format;
import static java.util.Collections.nCopies;
import static java.util.stream.Collectors.joining;
import com.google.auto.value.AutoValue;
import com.google.common.collect.ImmutableList;
import com.google.errorprone.BugPattern;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.fixes.SuggestedFix;
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.LiteralTree;
import com.sun.source.tree.MethodInvocationTree;
import java.util.regex.Pattern;
/** A BugPattern; see the summary. */
@BugPattern(
severity = ERROR,
summary =
"The number of arguments provided to lenient format methods should match the positional"
+ " specifiers.")
public final class LenientFormatStringValidation extends BugChecker
implements MethodInvocationTreeMatcher {
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
for (LenientFormatMethod method : METHODS) {
if (!method.matcher().matches(tree, state)) {
continue;
}
var args = tree.getArguments();
if (args.size() <= method.formatStringPosition()) {
continue;
}
ExpressionTree formatStringArgument = args.get(method.formatStringPosition());
Object formatString = ASTHelpers.constValue(formatStringArgument);
if (!(formatString instanceof String)) {
continue;
}
int expected = occurrences((String) formatString, "%s");
int actual = args.size() - method.formatStringPosition() - 1;
if (expected == actual) {
continue;
}
var builder =
buildDescription(tree)
.setMessage(format("Expected %s positional arguments, but saw %s", expected, actual));
if (expected < actual) {
String extraArgs =
nCopies(actual - expected, "%s").stream().collect(joining(", ", " (", ")"));
int endPos = state.getEndPosition(formatStringArgument);
builder.addFix(
formatStringArgument instanceof LiteralTree
? SuggestedFix.replace(endPos - 1, endPos, extraArgs + "\"")
: SuggestedFix.postfixWith(formatStringArgument, format("+ \"%s\"", extraArgs)));
}
return builder.build();
}
return NO_MATCH;
}
private static int occurrences(String haystack, String needle) {
int count = 0;
int start = 0;
while (true) {
start = haystack.indexOf(needle, start);
if (start == -1) {
return count;
}
count++;
start += needle.length();
}
}
// TODO(ghm): Consider replacing this with an annotation-based approach (@LenientFormatString?)
private static final ImmutableList METHODS =
ImmutableList.of(
LenientFormatMethod.create(
staticMethod()
.onClass("com.google.common.base.Preconditions")
.withNameMatching(Pattern.compile("^check.*")),
1),
LenientFormatMethod.create(
staticMethod()
.onClass("com.google.common.base.Verify")
.withNameMatching(Pattern.compile("^verify.*")),
1),
LenientFormatMethod.create(
staticMethod().onClass("com.google.common.base.Strings").named("lenientFormat"), 0),
LenientFormatMethod.create(
staticMethod().onClass("com.google.common.truth.Truth").named("assertWithMessage"),
0),
LenientFormatMethod.create(
instanceMethod().onDescendantOf("com.google.common.truth.Subject").named("check"), 0),
LenientFormatMethod.create(
instanceMethod()
.onDescendantOf("com.google.common.truth.StandardSubjectBuilder")
.named("withMessage"),
0));
@AutoValue
abstract static class LenientFormatMethod {
abstract Matcher matcher();
/** Position of the format string; we assume every argument afterwards is a format argument. */
abstract int formatStringPosition();
public static LenientFormatMethod create(
Matcher matcher, int formatStringPosition) {
return new AutoValue_LenientFormatStringValidation_LenientFormatMethod(
matcher, formatStringPosition);
}
}
}