Introducing coding standards validation.

vendor/phpcompatibility/php-compatibility/PHPCompatibility/Sniffs/MethodUse/NewDirectCallsToCloneSniff.php

@@ -0,0 +1,97 @@
+<?php
+/**
+ * PHPCompatibility, an external standard for PHP_CodeSniffer.
+ *
+ * @package   PHPCompatibility
+ * @copyright 2012-2018 PHPCompatibility Contributors
+ * @license   https://opensource.org/licenses/LGPL-3.0 LGPL3
+ * @link      https://github.com/PHPCompatibility/PHPCompatibility
+ */
+
+namespace PHPCompatibility\Sniffs\MethodUse;
+
+use PHPCompatibility\Sniff;
+use PHP_CodeSniffer_File as File;
+use PHP_CodeSniffer_Tokens as Tokens;
+
+/**
+ * Detect direct calls to the __clone() magic method which is allowed since PHP 7.0.
+ *
+ * "Doing calls like $obj->__clone() is now allowed. This was the only magic method
+ *  that had a compile-time check preventing some calls to it, which doesn't make sense.
+ *  If we allow all other magic methods to be called, there's no reason to forbid this one."
+ *
+ * PHP version 7.0
+ *
+ * @link https://wiki.php.net/rfc/abstract_syntax_tree#directly_calling_clone_is_allowed
+ *
+ * @since 9.1.0
+ */
+class NewDirectCallsToCloneSniff extends Sniff
+{
+
+    /**
+     * Returns an array of tokens this test wants to listen for.
+     *
+     * @since 9.1.0
+     *
+     * @return array
+     */
+    public function register()
+    {
+        return array(
+            T_DOUBLE_COLON,
+            T_OBJECT_OPERATOR,
+        );
+    }
+
+    /**
+     * Processes this test, when one of its tokens is encountered.
+     *
+     * @since 9.1.0
+     *
+     * @param \PHP_CodeSniffer_File $phpcsFile The file being scanned.
+     * @param int                   $stackPtr  The position of the current token in
+     *                                         the stack passed in $tokens.
+     *
+     * @return void
+     */
+    public function process(File $phpcsFile, $stackPtr)
+    {
+        if ($this->supportsBelow('5.6') === false) {
+            return;
+        }
+
+        $tokens = $phpcsFile->getTokens();
+
+        $nextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, ($stackPtr + 1), null, true);
+        if ($nextNonEmpty === false || $tokens[$nextNonEmpty]['code'] !== T_STRING) {
+            /*
+             * Not a method call.
+             *
+             * Note: This disregards method calls with the method name in a variable, like:
+             *   $method = '__clone';
+             *   $obj->$method();
+             * However, that would be very hard to examine reliably anyway.
+             */
+            return;
+        }
+
+        if (strtolower($tokens[$nextNonEmpty]['content']) !== '__clone') {
+            // Not a call to the __clone() method.
+            return;
+        }
+
+        $nextNextNonEmpty = $phpcsFile->findNext(Tokens::$emptyTokens, ($nextNonEmpty + 1), null, true);
+        if ($nextNextNonEmpty === false || $tokens[$nextNextNonEmpty]['code'] !== T_OPEN_PARENTHESIS) {
+            // Not a method call.
+            return;
+        }
+
+        $phpcsFile->addError(
+            'Direct calls to the __clone() magic method are not allowed in PHP 5.6 or earlier.',
+            $nextNonEmpty,
+            'Found'
+        );
+    }
+}