fix parsing backtick quoted statement fragments

lib/Doctrine/DBAL/SQLParserUtils.php

@@ -36,6 +36,7 @@ class SQLParserUtils
     // Quote characters within string literals can be preceded by a backslash.
     const ESCAPED_SINGLE_QUOTED_TEXT = "'(?:[^'\\\\]|\\\\'|\\\\\\\\)*'";
     const ESCAPED_DOUBLE_QUOTED_TEXT = '"(?:[^"\\\\]|\\\\"|\\\\\\\\)*"';
+    const ESCAPED_BACKTICK_QUOTED_TEXT = '`(?:[^`\\\\]|\\\\`|\\\\\\\\)*`';
 
     /**
      * Gets an array of the placeholders in an sql statements as keys and their positions in the query string.
@@ -194,8 +195,10 @@ class SQLParserUtils
      */
     static private function getUnquotedStatementFragments($statement)
     {
-        $literal = self::ESCAPED_SINGLE_QUOTED_TEXT . '|' . self::ESCAPED_DOUBLE_QUOTED_TEXT;
-        preg_match_all("/([^'\"]+)(?:$literal)?/s", $statement, $fragments, PREG_OFFSET_CAPTURE);
+        $literal = self::ESCAPED_SINGLE_QUOTED_TEXT . '|' .
+                   self::ESCAPED_DOUBLE_QUOTED_TEXT . '|' .
+                   self::ESCAPED_BACKTICK_QUOTED_TEXT;
+        preg_match_all("/([^'\"`]+)(?:$literal)?/s", $statement, $fragments, PREG_OFFSET_CAPTURE);
 
         return $fragments[1];
     }

tests/Doctrine/Tests/DBAL/SQLParserUtilsTest.php

@@ -26,8 +26,10 @@ class SQLParserUtilsTest extends \Doctrine\Tests\DbalTestCase
             array('SELECT ? FROM ?', true, array(7, 14)),
             array('SELECT "?" FROM foo', true, array()),
             array("SELECT '?' FROM foo", true, array()),
+            array("SELECT `?` FROM foo", true, array()), // Ticket DBAL-552
             array('SELECT "?" FROM foo WHERE bar = ?', true, array(32)),
             array("SELECT '?' FROM foo WHERE bar = ?", true, array(32)),
+            array("SELECT `?` FROM foo WHERE bar = ?", true, array(32)), // Ticket DBAL-552
             array(
 <<<'SQLDATA'
 SELECT * FROM foo WHERE bar = 'it\'s a trap? \\' OR bar = ?
@@ -45,7 +47,8 @@ SQLDATA
             array('SELECT @rank := 1', false, array()), // Ticket DBAL-398
             array('SELECT @rank := 1 AS rank, :foo AS foo FROM :bar', false, array(27 => 'foo', 44 => 'bar')), // Ticket DBAL-398
             array('SELECT * FROM Foo WHERE bar > :start_date AND baz > :start_date', false, array(30 => 'start_date', 52 =>  'start_date')), // Ticket GH-113
-            array('SELECT foo::date as date FROM Foo WHERE bar > :start_date AND baz > :start_date', false, array(46 => 'start_date', 68 =>  'start_date')) // Ticket GH-259
+            array('SELECT foo::date as date FROM Foo WHERE bar > :start_date AND baz > :start_date', false, array(46 => 'start_date', 68 =>  'start_date')), // Ticket GH-259
+            array('SELECT `d.ns:col_name` FROM my_table d WHERE `d.date` >= :param1', false, array(57 => 'param1')), // Ticket DBAL-552
         );
     }