bug #6170 NonPrintableCharacterFixer - fix for string in single quote…

…s, having non-breaking space, linebreak, and single quote inside (kubawerlos)

This PR was squashed before being merged into the master branch (closes #6170).

Discussion
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NonPrintableCharacterFixer - fix for string in single quotes, having non-breaking space, linebreak, and single quote inside

In the topic of edge cases - this one is awesome, the title says it all.

Don't give me any credits for this, I'm not that smart to came with this one - all the glory goes to Google.

see it at your own risk, not the prettiest code you'll ever see: https://github.com/googleapis/google-cloud-php/blob/v0.172.0/Compute/metadata/V1/Compute.php.

Commits
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c02a447 NonPrintableCharacterFixer - fix for string in single quotes, having non-breaking space, linebreak, and single quote inside

src/Fixer/Basic/NonPrintableCharacterFixer.php

@@ -165,7 +165,7 @@ protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
 
                 if ($swapQuotes) {
                     $content = str_replace('"', '\"', $content);
-                    $content = Preg::replace('/^\'(.*)\'$/', '"$1"', $content);
+                    $content = Preg::replace('/^\'(.*)\'$/s', '"$1"', $content);
                 }
 
                 $tokens[$index] = new Token([$token->getId(), strtr($content, $escapeSequences)]);

tests/Fixer/Basic/NonPrintableCharacterFixerTest.php

@@ -303,6 +303,10 @@ function f(string $p)
 INPUT
                  , pack('H*', 'e2808b')),
             ],
+            [
+                "<?php \"String in single quotes, having non-breaking space: \\u{a0}, linebreak: \n, and single quote inside: ' is a dangerous mix.\";",
+                "<?php 'String in single quotes, having non-breaking space: ".pack('H*', 'c2a0').", linebreak: \n, and single quote inside: \\' is a dangerous mix.';",
+            ],
         ];
     }
 }