Cache namespaces for faster performance

src/Unleashed/Helpers/NamespaceHelper.php

@@ -0,0 +1,26 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Unleashed\Helpers;
+
+use PHP_CodeSniffer\Files\File;
+
+/**
+ * @internal
+ *
+ * Adapted from https://github.com/slevomat/coding-standard/blob/c7d4801da5b439cec0d7cd6fa770164b07a4d92b/SlevomatCodingStandard/Helpers/NamespaceHelper.php
+ */
+final class NamespaceHelper
+{
+    public static function getFirstNamespacePointer(File $phpcsFile): ?int
+    {
+        $lazyValue = static function () use ($phpcsFile): ?int {
+            $token = $phpcsFile->findNext(T_NAMESPACE, 0);
+
+            return $token === false ? null : $token;
+        };
+
+        return SniffLocalCache::getAndSetIfNotCached($phpcsFile, 'firstNamespacePointer', $lazyValue);
+    }
+}

src/Unleashed/Sniffs/Namespaces/FullyQualifiedGlobalFunctionsSniff.php

@@ -7,6 +7,7 @@
 use PHP_CodeSniffer\Files\File;
 use PHP_CodeSniffer\Sniffs\Sniff;
 use SlevomatCodingStandard\Sniffs\Classes\ModernClassNameReferenceSniff;
+use Unleashed\Helpers\NamespaceHelper;
 use Unleashed\Helpers\UseStatements;
 
 final class FullyQualifiedGlobalFunctionsSniff implements Sniff
@@ -83,7 +84,8 @@ public function register()
     public function process(File $phpcsFile, $stackPtr)
     {
         // Abort if we're not in namespaced code
-        if ($phpcsFile->findPrevious([T_NAMESPACE], $stackPtr - 1) === false) {
+        $firstNamespacePointer = NamespaceHelper::getFirstNamespacePointer($phpcsFile);
+        if ($firstNamespacePointer === null || $stackPtr < $firstNamespacePointer) {
             return;
         }