[REBOL] Re: Parsing question
From: gscottjones:mchsi at: 14-Apr-2003 7:00
From: "Serge Gilette"
> ... I have a parsing question. I am trying to parse a
> string of PGN format. it is the formalize way to notee
> a chess game, for those who don't know.
I didn't know that. Thanks!
> I want to explicitly say that the space or the newline can end some
> sub-pattern. But i have an error message if i use the commented line
> below...
rest of posting:
http://www.escribe.com/internet/rebol/m30984.html
Hi, Serge,
I am no expert on parsing. I am trying to get better, so yours was an
interesting problem. If I recall correctly, one cannot use the parse word
to
with charsets, hence the continual errors. I had to hunt and peck
myself to figure this one out, but the following seems to work. I also
added a bit more to the rules to be sure the last move was parsed.
I am sure that a real parse guru will show *the best way* to do it also.
HTH!
--Scott Jones
digit: charset [#"0" - #"9"]
space: #" "
crlf: #"^/"
spacer: [to space | to crlf | to end]
round_number: [copy x some digit #"." (print join "tour=" x)]
round_played: [copy y spacer (print join "played=" y)]
round_comment: [#"{" copy comm to #"}" (print comm) spacer]
round: [round_number round_played round_played opt round_comment]
game: [some round]
rules: [game to end]
parse "1.d3 d5 2.Nf3 Nf6 3.Bd2 c5 4.g3 Nc6 {a comment} 5.Na3 e6 6.b3 Be7"
rules
