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Ruleset: handle invalid sniffs more graciously
As things were, a ruleset loading an invalid sniff - a sniff which doesn't implement the `Sniff` interface and is missing either the `register()` or `process()` method, or both -, would result in fatal errors which are unfriendly to the end-user. Now, while this will hopefully be a very rare occurrence and should no longer be possible as of PHPCS 4.0, which intends to remove support for sniffs not implementing the `Sniff` interface, I still believe it prudent to show more user-friendly and more informative error messages to the end-user until that time. This commit implements this and executes step 2 to address issue 694.. Includes tests. Output of commands involving various invalid sniffs **before** this PR: ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterTest.xml Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterSniff::register() in path/to/PHP_CodeSniffer/src/Ruleset.php:1505 Stack trace: thrown in path/to/PHP_CodeSniffer/src/Ruleset.php on line 1505 ``` ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoProcessTest.xml PHP_CodeSniffer version 3.11.1 (stable) by Squiz and PHPCSStandards Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoProcessSniff::process() in path/to/PHP_CodeSniffer/src/Files/File.php:519 Stack trace: thrown in path/to/PHP_CodeSniffer/src/Files/File.php on line 519 ``` ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml PHP_CodeSniffer version 3.11.1 (stable) by Squiz and PHPCSStandards Fatal error: Uncaught Error: Call to undefined method TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterOrProcessSniff::register() in path/to/PHP_CodeSniffer/src/Ruleset.php:1505 Stack trace: thrown in path/to/PHP_CodeSniffer/src/Ruleset.php on line 1505 ``` Output of commands involving various invalid sniffs **after** this PR: ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterTest.xml ERROR: Sniff class TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterSniff is missing required method register(). ``` ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoProcessTest.xml ERROR: Sniff class TestStandard\Sniffs\InvalidSniffError\NoImplementsNoProcessSniff is missing required method process(). ``` ``` $ phpcs -ps . --standard=./tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml ERROR: Sniff class TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterOrProcessSniff is missing required method register(). ERROR: Sniff class TestStandard\Sniffs\InvalidSniffError\NoImplementsNoRegisterOrProcessSniff is missing required method process(). ```
1 parent c6a579e commit 97e340e

10 files changed

+172
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lines changed

‎src/Ruleset.php

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@@ -1409,6 +1409,24 @@ public function registerSniffs($files, $restrictions, $exclusions)
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continue;
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}
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if ($reflection->implementsInterface('PHP_CodeSniffer\Sniffs\Sniff') === false) {
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// Skip classes which don't implement the register() or process() methods.
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if (method_exists($className, 'register') === false
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|| method_exists($className, 'process') === false
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) {
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$errorMsg = 'Sniff class %s is missing required method %s().';
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if (method_exists($className, 'register') === false) {
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$this->msgCache->add(sprintf($errorMsg, $className, 'register'), MessageCollector::ERROR);
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}
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if (method_exists($className, 'process') === false) {
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$this->msgCache->add(sprintf($errorMsg, $className, 'process'), MessageCollector::ERROR);
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}
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continue;
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}
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}//end if
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$listeners[$className] = $className;
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if (PHP_CODESNIFFER_VERBOSITY > 2) {

‎tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoProcessSniff.php

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@@ -0,0 +1,17 @@
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<?php
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/**
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* Test fixture.
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*
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* @see \PHP_CodeSniffer\Tests\Core\Ruleset\RegisterSniffsRejectsInvalidSniffTest
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*/
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namespace Fixtures\TestStandard\Sniffs\InvalidSniffError;
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final class NoImplementsNoProcessSniff
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{
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public function register()
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{
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return [T_OPEN_TAG];
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}
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}

‎tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoRegisterOrProcessSniff.php

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<?php
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/**
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* Test fixture.
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*
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* @see \PHP_CodeSniffer\Tests\Core\Ruleset\RegisterSniffsRejectsInvalidSniffTest
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*/
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namespace Fixtures\TestStandard\Sniffs\InvalidSniffError;
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final class NoImplementsNoRegisterOrProcessSniff
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{
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}

‎tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoRegisterSniff.php

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<?php
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/**
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* Test fixture.
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*
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* @see \PHP_CodeSniffer\Tests\Core\Ruleset\RegisterSniffsRejectsInvalidSniffTest
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*/
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namespace Fixtures\TestStandard\Sniffs\InvalidSniffError;
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use PHP_CodeSniffer\Files\File;
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final class NoImplementsNoRegisterSniff
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{
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public function process(File $phpcsFile, $stackPtr)
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{
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// Do something.
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}
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}

‎tests/Core/Ruleset/ProcessRulesetAutoExpandSniffsDirectoryTest.xml

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@@ -5,6 +5,7 @@
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<rule ref="TestStandard">
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<exclude name="TestStandard.InvalidSniffs"/>
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<exclude name="TestStandard.InvalidSniffError"/>
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</rule>
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</ruleset>

‎tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoProcessTest.xml

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<?xml version="1.0"?>
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<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="RegisterSniffsRejectsInvalidSniffTest" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/PHPCSStandards/PHP_CodeSniffer/master/phpcs.xsd">
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<rule ref="./tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoProcessSniff.php"/>
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<!-- Prevent a "no sniff were registered" error. -->
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<rule ref="Generic.PHP.BacktickOperator"/>
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</ruleset>

‎tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml

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<?xml version="1.0"?>
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<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="RegisterSniffsRejectsInvalidSniffTest" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/PHPCSStandards/PHP_CodeSniffer/master/phpcs.xsd">
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<rule ref="./tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoRegisterOrProcessSniff.php"/>
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<!-- Prevent a "no sniff were registered" error. -->
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<rule ref="Generic.PHP.BacktickOperator"/>
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</ruleset>

‎tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterTest.xml

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<?xml version="1.0"?>
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<ruleset xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" name="RegisterSniffsRejectsInvalidSniffTest" xsi:noNamespaceSchemaLocation="https://raw.githubusercontent.com/PHPCSStandards/PHP_CodeSniffer/master/phpcs.xsd">
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<rule ref="./tests/Core/Ruleset/Fixtures/TestStandard/Sniffs/InvalidSniffError/NoImplementsNoRegisterSniff.php"/>
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<!-- Prevent a "no sniff were registered" error. -->
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<rule ref="Generic.PHP.BacktickOperator"/>
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</ruleset>

‎tests/Core/Ruleset/RegisterSniffsRejectsInvalidSniffTest.php

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<?php
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/**
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* Tests that invalid sniffs will be rejected with an informative error message.
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*
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* @author Juliette Reinders Folmer <[email protected]>
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* @copyright 2025 PHPCSStandards and contributors
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* @license https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/master/licence.txt BSD Licence
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*/
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namespace PHP_CodeSniffer\Tests\Core\Ruleset;
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use PHP_CodeSniffer\Ruleset;
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use PHP_CodeSniffer\Tests\ConfigDouble;
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use PHP_CodeSniffer\Tests\Core\Ruleset\AbstractRulesetTestCase;
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/**
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* Tests that invalid sniffs will be rejected with an informative error message.
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*
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* @covers \PHP_CodeSniffer\Ruleset::registerSniffs
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*/
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final class RegisterSniffsRejectsInvalidSniffTest extends AbstractRulesetTestCase
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{
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/**
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* Verify that an error is thrown if an invalid sniff class is loaded.
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*
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* @param string $standard The standard to use for the test.
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* @param string $methodName The name of the missing method.
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*
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* @dataProvider dataExceptionIsThrownOnMissingInterfaceMethod
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*
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* @return void
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*/
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public function testExceptionIsThrownOnMissingInterfaceMethod($standard, $methodName)
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{
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// Set up the ruleset.
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$standard = __DIR__.'/'.$standard;
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$config = new ConfigDouble(["--standard=$standard"]);
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$regex = "`(^|\R)ERROR: Sniff class \S+Sniff is missing required method $methodName\(\)\.\R`";
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$this->expectRuntimeExceptionRegex($regex);
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new Ruleset($config);
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}//end testExceptionIsThrownOnMissingInterfaceMethod()
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/**
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* Data provider.
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*
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* @see testExceptionIsThrownOnMissingInterfaceMethod()
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*
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* @return array<string, array<string, string>>
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*/
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public static function dataExceptionIsThrownOnMissingInterfaceMethod()
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{
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return [
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'Missing register() method' => [
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'standard' => 'RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterTest.xml',
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'methodName' => 'register',
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],
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'Missing process() method' => [
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'standard' => 'RegisterSniffsRejectsInvalidSniffNoImplementsNoProcessTest.xml',
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'methodName' => 'process',
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],
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'Missing both, checking register() method' => [
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'standard' => 'RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml',
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'methodName' => 'register',
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],
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'Missing both, checking process() method' => [
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'standard' => 'RegisterSniffsRejectsInvalidSniffNoImplementsNoRegisterOrProcessTest.xml',
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'methodName' => 'process',
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],
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];
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}//end dataExceptionIsThrownOnMissingInterfaceMethod()
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}//end class

‎tests/Core/Ruleset/ShowSniffDeprecationsTest.xml

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@@ -6,6 +6,7 @@
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<rule ref="TestStandard">
77
<exclude name="TestStandard.DeprecatedInvalid"/>
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<exclude name="TestStandard.InvalidSniffs"/>
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<exclude name="TestStandard.InvalidSniffError"/>
910
</rule>
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</ruleset>

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