ClassMapGenerator: fix two bugs (long heredocs + markers in text)

src/Composer/Autoload/ClassMapGenerator.php

@@ -246,7 +246,7 @@ private static function findClasses($path)
         }
 
         // strip heredocs/nowdocs
-        $contents = preg_replace('{<<<[ \t]*([\'"]?)(\w+)\\1(?:\r\n|\n|\r)(?:.*?)(?:\r\n|\n|\r)(?:\s*)\\2(?=\s+|[;,.)])}s', 'null', $contents);
+        $contents = preg_replace('{<<<[ \t]*([\'"]?)(\w+)\\1(?:\r\n|\n|\r)(?:.*(?=[\r\n]+[ \t]*\\2))[\r\n]+[ \t]*\\2(?=\s*[;,.)])}s', 'null', $contents);
         // strip strings
         $contents = preg_replace('{"[^"\\\\]*+(\\\\.[^"\\\\]*+)*+"|\'[^\'\\\\]*+(\\\\.[^\'\\\\]*+)*+\'}s', 'null', $contents);
         // strip leading non-php code if needed

tests/Composer/Test/Autoload/ClassMapGeneratorTest.php

@@ -244,6 +244,25 @@ public function testDump()
         $fs->removeDirectory($tempDir);
     }
 
+    public function testCreateMapDoesNotHitRegexBacktraceLimit()
+    {
+        $expected = array(
+            'Foo\\StripNoise'            => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/StripNoise.php',
+            'Foo\\VeryLongHeredoc'       => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongHeredoc.php',
+            'Foo\\ClassAfterLongHereDoc' => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongHeredoc.php',
+            'Foo\\VeryLongPHP73Heredoc'  => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongPHP73Heredoc.php',
+            'Foo\\VeryLongPHP73Nowdoc'   => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongPHP73Nowdoc.php',
+            'Foo\\ClassAfterLongNowDoc'  => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongPHP73Nowdoc.php',
+            'Foo\\VeryLongNowdoc'        => realpath(__DIR__) . '/Fixtures/pcrebacktracelimit/VeryLongNowdoc.php',
+        );
+
+        ini_set('pcre.backtrack_limit', '30000');
+        $result = ClassMapGenerator::createMap(__DIR__ . '/Fixtures/pcrebacktracelimit');
+        ini_restore('pcre.backtrack_limit');
+
+        $this->assertEqualsNormalized($expected, $result);
+    }
+
     protected function assertEqualsNormalized($expected, $actual, $message = '')
     {
         foreach ($expected as $ns => $path) {

tests/Composer/Test/Autoload/Fixtures/classmap/StripNoise.php

@@ -17,7 +17,12 @@ class FailHeredocBasic
 class FailHeredocWhitespace
 {
 }
-WHITESPACE . <<<"DOUBLEQUOTES"
+WHITESPACE . <<<  MARKERINTEXT
+    In PHP < 7.3, the docblock marker could occur in the text as long as it did not occur at the very start of the line.
+But, what are you blind McFly, it's there. How else do you explain that wreck out there? Doc, Doc. Oh, no. You're alive. Bullet proof vest, how did you know, I never got a chance to tell you. About all that talk about screwing up future events, the space time continuum. Okay, alright, I'll prove it to you.
+    MARKERINTEXT
+ Look at my driver's license, expires 1987. Look at my birthday, for crying out load I haven't even been born yet. And, look at this picture, my brother, my sister, and me. Look at the sweatshirt, Doc, class of 1984. Why do you keep following me around? Hey beat it, spook, this don't concern you.
+MARKERINTEXT . <<<"DOUBLEQUOTES"
 class FailHeredocDoubleQuotes
 {
 }

tests/Composer/Test/Autoload/Fixtures/pcrebacktracelimit/StripNoise.php

@@ -0,0 +1,87 @@
+<?php
+
+namespace Foo;
+
+/**
+ * class StripNoise { }
+ */
+class StripNoise
+{
+    public function test_heredoc()
+    {
+        return <<<HEREDOC
+class FailHeredocBasic
+{
+}
+HEREDOC . <<<  WHITESPACE
+class FailHeredocWhitespace
+{
+}
+WHITESPACE . <<<"DOUBLEQUOTES"
+class FailHeredocDoubleQuotes
+{
+}
+DOUBLEQUOTES . <<<	"DOUBLEQUOTESTABBED"
+class FailHeredocDoubleQuotesTabbed
+{
+}
+DOUBLEQUOTESTABBED . <<<HEREDOCPHP73
+  class FailHeredocPHP73
+  {
+  }
+  HEREDOCPHP73;
+    }
+
+    public function test_nowdoc()
+    {
+        return <<<'NOWDOC'
+class FailNowdocBasic
+{
+}
+NOWDOC . <<<  'WHITESPACE'
+class FailNowdocWhitespace
+{
+}
+WHITESPACE . <<<	'NOWDOCTABBED'
+class FailNowdocTabbed
+{
+}
+NOWDOCTABBED . <<<'NOWDOCPHP73'
+  class FailNowdocPHP73
+  {
+  }
+  NOWDOCPHP73;
+    }
+
+    public function test_followed_by_parentheses()
+    {
+        return array(<<<PARENTHESES
+            class FailParentheses
+            {
+            }
+            PARENTHESES);
+    }
+
+    public function test_followed_by_comma()
+    {
+        return array(1, 2, <<<COMMA
+            class FailComma
+            {
+            }
+            COMMA, 3, 4);
+    }
+
+    public function test_followed_by_period()
+    {
+        return <<<PERIOD
+            class FailPeriod
+            {
+            }
+            PERIOD.'?>';
+    }
+
+    public function test_simple_string()
+    {
+        return 'class FailSimpleString {}';
+    }
+}