Generic/LineLength: ignore line length for use statements

From PHP8 on use statements are considered a single token. For this
reason they cannot be splitted up to shorter namespaces.

PHPCS doesn't account for that and will throw line length errors
and warnings for the use statements. This change ignores the line
length for the use statements.

RFC link: https://wiki.php.net/rfc/namespaced_names_as_token
Issue link: squizlabs/PHP_CodeSniffer#3606

src/Standards/Generic/Sniffs/Files/LineLengthSniff.php

@@ -46,6 +46,13 @@ class LineLengthSniff implements Sniff
      */
     public $ignoreComments = false;
 
+    /**
+     * Whether or not to ignore use statements.
+     *
+     * @var boolean
+     */
+    public $ignoreUseStatements = false;
+
 
     /**
      * Returns an array of tokens this test wants to listen for.
@@ -141,6 +148,16 @@ protected function checkLineLength($phpcsFile, $tokens, $stackPtr)
             $lineLength -= $tokens[$stackPtr]['length'];
         }
 
+        if ($this->ignoreUseStatements === true
+            && $lineLength > $this->lineLimit
+        ) {
+            $prevUseStatement = $phpcsFile->findPrevious([T_USE], ($stackPtr - 1));
+            if ($tokens[$stackPtr]['line'] === $tokens[$prevUseStatement]['line']) {
+                // Ignore use statements as these can only be on one line
+                return;
+            }
+        }
+
         // Record metrics for common line length groupings.
         if ($lineLength <= 80) {
             $phpcsFile->recordMetric($stackPtr, 'Line length', '80 or less');

src/Standards/Generic/Tests/Files/LineLengthUnitTest.1.inc

@@ -82,3 +82,9 @@ $ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab	=  	$ab;
 $a = $b; // phpcs:ignore Standard.Category.Sniff.ErrorCode1,Standard.Category.Sniff.ErrorCode2 -- for reasons ...
 
 if (($anotherReallyLongVarName === true) {} // This comment makes the line too long.
+
+?>
+
+<?php
+
+use ThisReallyLong\Long\Loooooooooooooooong\Loooooooooooooooong\UseStatement\ThatShouldBeAllowed\AndThrowNoWarningsOrErrors;

src/Standards/Generic/Tests/Files/LineLengthUnitTest.5.inc

@@ -0,0 +1,8 @@
+phpcs:set Generic.Files.LineLength ignoreUseStatements true
+<?php
+
+/* This line is fine. */
+use ThisShort\UseStatement\ThatShouldBeAllowed;
+
+/* This line is too long but will be ignored. This line is too long but will be ignored. */
+use ThisReallyLong\Long\Loooooooooooooooong\Loooooooooooooooong\UseStatement\ThatShouldBeAllowed\AndThrowNoWarningsOrErrors;

src/Standards/Generic/Tests/Files/LineLengthUnitTest.php

@@ -54,6 +54,7 @@ public function getErrorList($testFile='')
                 34 => 1,
                 45 => 1,
                 82 => 1,
+                90 => 1,
             ];
 
         case 'LineLengthUnitTest.2.inc':