Generic/UnnecessaryHeredoc: 2 bug fixes involving escape sequences

src/Standards/Generic/Sniffs/Strings/UnnecessaryHeredocSniff.php

@@ -15,6 +15,35 @@
 class UnnecessaryHeredocSniff implements Sniff
 {
 
+    /**
+     * Escape chars which are supported in heredocs, but not in nowdocs.
+     *
+     * @var array<string>
+     */
+    private $escapeChars = [
+        // Octal sequences.
+        '\0',
+        '\1',
+        '\2',
+        '\3',
+        '\4',
+        '\5',
+        '\6',
+        '\7',
+
+        // Various whitespace and the escape char.
+        '\n',
+        '\r',
+        '\t',
+        '\v',
+        '\e',
+        '\f',
+
+        // Hex and unicode sequences.
+        '\x',
+        '\u',
+    ];
+
 
     /**
      * Returns an array of tokens this test wants to listen for.
@@ -81,14 +110,33 @@ public function process(File $phpcsFile, $stackPtr)
 
         $phpcsFile->recordMetric($stackPtr, 'Heredoc contains interpolation or expression', 'no');
 
+        // Check for escape sequences which aren't supported in nowdocs.
+        foreach ($this->escapeChars as $testChar) {
+            if (strpos($body, $testChar) !== false) {
+                return;
+            }
+        }
+
         $warning = 'Detected heredoc without interpolation or expressions. Use nowdoc syntax instead';
 
         $fix = $phpcsFile->addFixableWarning($warning, $stackPtr, 'Found');
         if ($fix === true) {
+            $phpcsFile->fixer->beginChangeset();
+
             $identifier  = trim(ltrim($tokens[$stackPtr]['content'], '<'));
             $replaceWith = "'".trim($identifier, '"')."'";
             $replacement = str_replace($identifier, $replaceWith, $tokens[$stackPtr]['content']);
             $phpcsFile->fixer->replaceToken($stackPtr, $replacement);
+
+            for ($i = ($stackPtr + 1); $i < $closer; $i++) {
+                $content = $tokens[$i]['content'];
+                $content = str_replace(['\\$', '\\\\'], ['$', '\\'], $content);
+                if ($tokens[$i]['content'] !== $content) {
+                    $phpcsFile->fixer->replaceToken($i, $content);
+                }
+            }
+
+            $phpcsFile->fixer->endChangeset();
         }
 
     }//end process()

src/Standards/Generic/Tests/Strings/UnnecessaryHeredocUnitTest.1.inc

@@ -104,5 +104,19 @@ END;
 $heredoc = <<< "END"
 some text
 some \$text
-some text
+some text \\ including a backslash
 END;
+
+$heredoc = <<<EOD
+<?php
+echo 'The below line contains escape characters and should be recognized as needing heredoc';
+echo "aa\xC3\xC3	\xC3\xB8aa";
+EOD;
+
+echo <<<EOT
+This should print a capital 'A': \x41
+EOT;
+
+echo <<<EOT
+Here we should have a tab and 2 'A's: \t \101 \u{41}
+EOT;

src/Standards/Generic/Tests/Strings/UnnecessaryHeredocUnitTest.1.inc.fixed

@@ -103,6 +103,20 @@ END;
 
 $heredoc = <<< 'END'
 some text
-some \$text
-some text
+some $text
+some text \ including a backslash
 END;
+
+$heredoc = <<<EOD
+<?php
+echo 'The below line contains escape characters and should be recognized as needing heredoc';
+echo "aa\xC3\xC3	\xC3\xB8aa";
+EOD;
+
+echo <<<EOT
+This should print a capital 'A': \x41
+EOT;
+
+echo <<<EOT
+Here we should have a tab and 2 'A's: \t \101 \u{41}
+EOT;

src/Standards/Generic/Tests/Strings/UnnecessaryHeredocUnitTest.2.inc

@@ -104,5 +104,19 @@ $heredoc = <<<END
 $heredoc = <<< "END"
     some text
     some \$text
-    some text
+    some text \\ including a backslash
     END;
+
+$heredoc = <<<EOD
+    <?php
+    echo 'The below line contains escape characters and should be recognized as needing heredoc';
+    echo "aa\xC3\xC3	\xC3\xB8aa";
+    EOD;
+
+echo <<<EOT
+    This should print a capital 'A': \x41
+    EOT;
+
+echo <<<EOT
+    Here we should have a tab and 2 'A's: \t \101 \u{41}
+    EOT;

src/Standards/Generic/Tests/Strings/UnnecessaryHeredocUnitTest.2.inc.fixed

@@ -103,6 +103,20 @@ $heredoc = <<<'END'
 
 $heredoc = <<< 'END'
     some text
-    some \$text
-    some text
+    some $text
+    some text \ including a backslash
     END;
+
+$heredoc = <<<EOD
+    <?php
+    echo 'The below line contains escape characters and should be recognized as needing heredoc';
+    echo "aa\xC3\xC3	\xC3\xB8aa";
+    EOD;
+
+echo <<<EOT
+    This should print a capital 'A': \x41
+    EOT;
+
+echo <<<EOT
+    Here we should have a tab and 2 'A's: \t \101 \u{41}
+    EOT;