pdo_pgsql: add support for "escape" string literals

RFC: http://wiki.php.net/rfc/pdo_driver_specific_parsers

Author: mbeccati

ext/pdo_pgsql/pgsql_sql_parser.re

@@ -30,12 +30,13 @@ int pdo_pgsql_scanner(pdo_scanner_t *s)
 	QUESTION	= [?];
 	ESCQUESTION	= [?][?];
 	COMMENTS	= ("/*"([^*]+|[*]+[^/*])*[*]*"*/"|"--"[^\r\n]*);
-	SPECIALS	= [:?"'/-];
+	SPECIALS	= [eE:?"'/-];
 	MULTICHAR	= [:]{2,};
 	ANYNOEOF	= [\001-\377];
 	*/
 
 	/*!re2c
+		[eE](['](([']['])|([\\]ANYNOEOF)|ANYNOEOF\['\\])*[']) { RET(PDO_PARSER_TEXT); }
 		(["]((["]["])|ANYNOEOF\["])*["])		{ RET(PDO_PARSER_TEXT); }
 		(['](([']['])|ANYNOEOF\['])*['])		{ RET(PDO_PARSER_TEXT); }
 		MULTICHAR								{ RET(PDO_PARSER_TEXT); }

ext/pdo_pgsql/tests/pdo_pgsql_parser.phpt

@@ -0,0 +1,36 @@
+--TEST--
+PgSQL PDO Parser custom syntax
+--EXTENSIONS--
+pdo
+pdo_pgsql
+--SKIPIF--
+<?php
+require __DIR__ . '/config.inc';
+require dirname(__DIR__, 2) . '/pdo/tests/pdo_test.inc';
+PDOTest::skip();
+?>
+--FILE--
+<?php
+
+require_once __DIR__ . "/config.inc";
+
+$db = new PdoPgsql($config['ENV']['PDOTEST_DSN']);
+$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
+
+$query = <<<EOF
+SELECT e'He''ll\'o ' || ? AS b -- '
+UNION ALL
+SELECT 'He''ll''o\' || ? AS b -- '
+EOF;
+
+$stmt = $db->prepare($query);
+$stmt->execute(['World', 'World']);
+
+while ($row = $stmt->fetchColumn()) {
+    var_dump($row);
+}
+
+?>
+--EXPECT--
+string(13) "He'll'o World"
+string(13) "He'll'o\World"