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Add sample Ur/Web files
Taken from tokenrove/parsur so I don't have to worry about license hassles. (You may relicense these samples as necessary.) It would be nice to have an example of the embedded SQL syntax in a sample.
This commit is contained in:
Julian Squires
79
samples/UrWeb/iso8601.ur
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79
samples/UrWeb/iso8601.ur
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open Parse.String
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val digit = satisfy isdigit
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val decimal_of_len n =
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ds <- count n digit;
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return (List.foldl (fn d acc => 10*acc + ((ord d)-(ord #"0"))) 0 ds)
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val date =
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y <- decimal_of_len 4;
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char' #"-";
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m <- decimal_of_len 2;
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char' #"-";
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d <- decimal_of_len 2;
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if m > 0 && m <= 12 then
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return {Year=y, Month=(Datetime.intToMonth (m-1)), Day=d}
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else
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fail
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(* We parse fractions of a second, but ignore them since Datetime
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doesn't permit representing them. *)
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val time =
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h <- decimal_of_len 2;
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char' #":";
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m <- decimal_of_len 2;
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s <- maybe (char' #":";
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s <- decimal_of_len 2;
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maybe' (char' #"."; skipWhile isdigit);
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return s);
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return {Hour=h, Minute=m, Second=Option.get 0 s}
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val timezone_offset =
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let val zulu = char' #"Z"; return 0
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val digits = decimal_of_len 2
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val sign = or (char' #"+"; return 1)
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(char' #"-"; return (-1))
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in
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zulu `or` (s <- sign;
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h <- digits;
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m <- (maybe' (char' #":"); or digits (return 0));
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return (s*(h*60+m)))
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end
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val datetime_with_tz =
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d <- date; char' #"T"; t <- time;
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tz <- timezone_offset;
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return (d ++ t ++ {TZOffsetMinutes=tz})
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val datetime =
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d <- datetime_with_tz;
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return (d -- #TZOffsetMinutes)
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fun process v =
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case parse (d <- datetime_with_tz; eof; return d) v of
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Some r =>
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let
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val {Year=year,Month=month,Day=day,
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Hour=hour,Minute=minute,Second=second} =
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Datetime.addMinutes (r.TZOffsetMinutes) (r -- #TZOffsetMinutes)
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fun pad x =
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if x < 10 then "0" `strcat` show x else show x
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in
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<xml>{[pad hour]}:{[pad minute]}:{[pad second]} {[month]} {[day]}, {[year]}</xml>
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end
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| None => <xml>none</xml>
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fun main () : transaction page =
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input <- source "2012-01-01T01:10:42Z";
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return <xml>
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<body>
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<label>
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Enter an
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<a href="https://en.wikipedia.org/wiki/ISO_8601">ISO 8601</a>
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datetime here:
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<ctextbox source={input} />
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</label>
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<ul><dyn signal={v <- signal input; return (process v)} /></ul>
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</body>
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</xml>
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85
samples/UrWeb/parse.urs
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85
samples/UrWeb/parse.urs
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functor Make(Stream : sig type t end) : sig
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con t :: Type -> Type
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val mreturn : a ::: Type -> a -> t a
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val mbind : a ::: Type -> b ::: Type ->
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(t a) -> (a -> t b) -> (t b)
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val monad_parse : monad t
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val parse : a ::: Type -> t a -> Stream.t -> option a
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(** Combinators *)
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val fail : a ::: Type -> t a
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val or : a ::: Type -> t a -> t a -> t a
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val maybe : a ::: Type -> t a -> t (option a)
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val maybe' : a ::: Type -> t a -> t unit
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val many : a ::: Type -> t a -> t (list a)
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val count : a ::: Type -> int -> t a -> t (list a)
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val skipMany : a ::: Type -> t a -> t unit
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val sepBy : a ::: Type -> s ::: Type -> t a -> t s -> t (list a)
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end
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structure String : sig
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con t :: Type -> Type
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val monad_parse : monad t
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val parse : a ::: Type -> t a -> string -> option a
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(** Combinators *)
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val fail : a ::: Type -> t a
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val or : a ::: Type -> t a -> t a -> t a
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val maybe : a ::: Type -> t a -> t (option a)
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val maybe' : a ::: Type -> t a -> t unit
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val many : a ::: Type -> t a -> t (list a)
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val count : a ::: Type -> int -> t a -> t (list a)
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val skipMany : a ::: Type -> t a -> t unit
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val sepBy : a ::: Type -> s ::: Type -> t a -> t s -> t (list a)
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val eof : t unit
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(* We provide alternative versions of some of these predicates
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* that return t unit as a monadic syntactical convenience. *)
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val string : string -> t string
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val string' : string -> t unit
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val stringCI : string -> t string
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val stringCI' : string -> t unit
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val char : char -> t char
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val char' : char -> t unit
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val take : int -> t (string*int)
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val drop : int -> t unit
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val satisfy : (char -> bool) -> t char
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val skip : (char -> bool) -> t unit
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val skipWhile : (char -> bool) -> t unit
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val takeWhile : (char -> bool) -> t (string*int)
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val takeWhile' : (char -> bool) -> t string (* conses *)
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(* Well, "till" is the correct form; but "til" is in common enough
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* usage that I'll prefer it for terseness. *)
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val takeTil : (char -> bool) -> t (string*int)
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val takeTil' : (char -> bool) -> t string (* conses *)
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val takeRest : t string
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(** Convenience functions *)
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val skipSpace : t unit
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val endOfLine : t unit
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val unsigned_int_of_radix : int -> t int
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(*
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* val signed_int_of_radix : int -> t int
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* val double : t float
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*)
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end
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structure Blob : sig
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con t :: Type -> Type
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val monad_parse : monad t
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val parse : a ::: Type -> t a -> blob -> option a
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(** Combinators *)
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val fail : a ::: Type -> t a
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val or : a ::: Type -> t a -> t a -> t a
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val maybe : a ::: Type -> t a -> t (option a)
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val maybe' : a ::: Type -> t a -> t unit
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val many : a ::: Type -> t a -> t (list a)
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val count : a ::: Type -> int -> t a -> t (list a)
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val skipMany : a ::: Type -> t a -> t unit
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val sepBy : a ::: Type -> s ::: Type -> t a -> t s -> t (list a)
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end
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