Add options to pass arguments to initialiser

src_v2/parser/parser_types.nim

@@ -52,14 +52,19 @@ type
 func initParserToken*(x: char): ParserToken = ParserToken(kind: parserTokenChar, charValue: x)
 func initParserToken*(x: string): ParserToken = ParserToken(kind: parserTokenString, stringValue: x)
 
-func initParser*(str: string): Parser =
+func initParser*(
+  stream: string,
+  tokens = newSeq[ParserToken](),
+  position = -1,
+  lastPosition = 0,
+): Parser =
   Parser(
     state: ParserState(
-      stream: str,
-      position: -1,
-      lastPosition: 0,
+      stream: stream,
+      position: position,
+      lastPosition: lastPosition,
     ),
-    tokens: newSeq[ParserToken](),
+    tokens: tokens,
   )
 
 func initParserResult*(str: string): ParserResult =