Interpret escape sequences only in strings that support it

Author: JanJakes

src/Import.php

@@ -89,18 +89,22 @@ public function parse_statements( $sql_file_path ) {
 			for ( $i = 0; $i < $strlen; $i++ ) {
 				$ch = $line[ $i ];
 
-				// Count preceding backslashes.
-				$slashes = 0;
-				while ( $slashes < $i && '\\' === $line[ $i - $slashes - 1 ] ) {
-					++$slashes;
-				}
+				// Handle escape sequences in single and double quoted strings.
+				// TODO: Support NO_BACKSLASH_ESCAPES SQL mode.
+				if ( "'" === $ch || '"' === $ch ) {
+					// Count preceding backslashes.
+					$slashes = 0;
+					while ( $slashes < $i && '\\' === $line[ $i - $slashes - 1 ] ) {
+						++$slashes;
+					}
 
-				// Handle escaped characters.
-				// A characters is escaped only when the number of preceding backslashes
-				// is odd - "\" is an escape sequence, "\\" is an escaped backslash.
-				if ( 1 === $slashes % 2 ) {
-					$buffer .= $ch;
-					continue;
+					// Handle escaped characters.
+					// A characters is escaped only when the number of preceding backslashes
+					// is odd - "\" is an escape sequence, "\\" is an escaped backslash.
+					if ( 1 === $slashes % 2 ) {
+						$buffer .= $ch;
+						continue;
+					}
 				}
 
 				// Handle comments.