[DBAL-2495] Optimize and improve parameter conversion in OCI8Statement

1. Reworked the parser syntax to use proper Oracle escaping syntax as '' instead of \'.
2. Moved valid tests to the Functional section to ensure correct SQL syntax and logic.

lib/Doctrine/DBAL/Driver/OCI8/OCI8Statement.php

@@ -218,7 +218,7 @@ private static function findClosingQuote(
         $token = self::findToken(
             $statement,
             $tokenOffset,
-            '/(?<!\\\\)' . preg_quote($currentLiteralDelimiter, '/') . '/'
+            '/' . preg_quote($currentLiteralDelimiter, '/') . '/'
         );
 
         if (!$token) {

tests/Doctrine/Tests/DBAL/Driver/OCI8/OCI8StatementTest.php

@@ -86,52 +86,30 @@ public static function executeDataProvider()
     }
 
     /**
-     * @dataProvider convertSuccessProvider
+     * @dataProvider nonTerminatedLiteralProvider
      */
-    public function testConvertSuccess($statement, $expectedStatement, $expectedParamCount)
+    public function testConvertNonTerminatedLiteral($sql, $message)
     {
-        list($converted, $paramMap) = OCI8Statement::convertPositionalToNamedPlaceholders($statement);
-        $this->assertEquals($expectedStatement, $converted);
-        $this->assertCount($expectedParamCount, $paramMap);
+        $this->expectException(OCI8Exception::class);
+        $this->expectExceptionMessageRegExp($message);
+        OCI8Statement::convertPositionalToNamedPlaceholders($sql);
     }
 
-    public static function convertSuccessProvider()
+    public static function nonTerminatedLiteralProvider()
     {
         return array(
-            'simple' => array(
-                'INSERT INTO table (column) VALUES(?)',
-                'INSERT INTO table (column) VALUES(:param1)',
-                1,
-            ),
-            'literal-with-placeholder' => array(
-                "INSERT INTO table (col1, col2, col3) VALUES('?', ?, \"?\", ?)",
-                "INSERT INTO table (col1, col2, col3) VALUES('?', :param1, \"?\", :param2)",
-                2,
+            'no-matching-quote' => array(
+                "SELECT 'literal FROM DUAL",
+                '/offset 7/',
             ),
-            'literal-with-quotes' => array(
-                "INSERT INTO table (col1, col2, col3, col4) VALUES('?\"?\\'?', ?, \"?'?\\\"?\", ?)",
-                "INSERT INTO table (col1, col2, col3, col4) VALUES('?\"?\'?', :param1, \"?'?\\\"?\", :param2)",
-                2,
+            'no-matching-double-quote' => array(
+                'SELECT 1 "COL1 FROM DUAL',
+                '/offset 9/',
             ),
-            'placeholder-at-the-end' => array(
-                "SELECT id FROM table WHERE col = ?",
-                "SELECT id FROM table WHERE col = :param1",
-                1,
-            ),
-            'multi-line-literal' => array(
-                "SELECT id FROM table WHERE col1 = ? AND col2 = 'Hello,
-World!' AND col3 = ?",
-                "SELECT id FROM table WHERE col1 = :param1 AND col2 = 'Hello,
-World!' AND col3 = :param2",
-                2,
+            'incorrect-escaping-syntax' => array(
+                "SELECT 'quoted \\'string' FROM DUAL",
+                '/offset 23/',
             ),
         );
     }
-
-    public function testConvertNonTerminatedLiteral()
-    {
-        $this->expectException(OCI8Exception::class);
-        $this->expectExceptionMessageRegExp('/offset 7/');
-        OCI8Statement::convertPositionalToNamedPlaceholders('SELECT "literal');
-    }
 }

tests/Doctrine/Tests/DBAL/Functional/Driver/OCI8/StatementTest.php

@@ -0,0 +1,85 @@
+<?php
+
+namespace Doctrine\Tests\DBAL\Functional\Driver\OCI8;
+
+use Doctrine\DBAL\Driver\OCI8\Driver;
+use Doctrine\Tests\DbalFunctionalTestCase;
+
+class StatementTest extends DbalFunctionalTestCase
+{
+    protected function setUp()
+    {
+        if (! extension_loaded('oci8')) {
+            $this->markTestSkipped('oci8 is not installed.');
+        }
+
+        parent::setUp();
+
+        if (! $this->_conn->getDriver() instanceof Driver) {
+            $this->markTestSkipped('oci8 only test.');
+        }
+    }
+
+    /**
+     * @dataProvider queryConversionProvider
+     */
+    public function testQueryConversion($query, array $params, array $expected)
+    {
+        $this->assertEquals(
+            $expected,
+            $this->_conn->executeQuery($query, $params)->fetch()
+        );
+    }
+
+    public static function queryConversionProvider()
+    {
+        return array(
+            'simple' => array(
+                'SELECT ? COL1 FROM DUAL',
+                array(1),
+                array(
+                    'COL1' => 1,
+                ),
+            ),
+            'literal-with-placeholder' => array(
+                "SELECT '?' COL1, ? COL2 FROM DUAL",
+                array(2),
+                array(
+                    'COL1' => '?',
+                    'COL2' => 2,
+                ),
+            ),
+            'literal-with-quotes' => array(
+                "SELECT ? COL1, '?\"?''?' \"COL?\" FROM DUAL",
+                array(3),
+                array(
+                    'COL1' => 3,
+                    'COL?' => '?"?\'?',
+                ),
+            ),
+            'placeholder-at-the-end' => array(
+                'SELECT ? COL1 FROM DUAL WHERE 1 = ?',
+                array(4, 1),
+                array(
+                    'COL1' => 4,
+                ),
+            ),
+            'multi-line-literal' => array(
+                "SELECT 'Hello,
+World?!' COL1 FROM DUAL WHERE 1 = ?",
+                array(1),
+                array(
+                    'COL1' => 'Hello,
+World?!',
+                ),
+            ),
+            'empty-literal' => array(
+                "SELECT '' COL1 FROM DUAL",
+                array(),
+                array(
+                    'COL1' => '',
+                ),
+            ),
+        );
+    }
+}