_file = file
end
+ # The last peeked token to chain them
+ private var last_token: nullable Token = null
+
# Give the next token (but do not consume it)
fun peek: Token
do
- while _token == null do
- _token = get_token
+ var t = _token
+ if t != null then return t
+
+ t = get_token
+ while t == null do t = get_token
+
+ var l = last_token
+ if l != null then
+ l.next_token = t
+ t.prev_token = l
end
- return _token.as(not null)
+
+ last_token = t
+ _token = t
+ return t
end
# Give and consume the next token