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|
(* scan.sml
*
* (C) 2001 Lucent Technologies, Bell Labs
*
* Read the output of format.sml and reconstruct the original
* PortableGraph.graph.
*
* author: Matthias Blume (blume@research.bell-labs.com)
*)
structure ScanPortable : sig
exception ParseError of string
val input : TextIO.instream -> PortableGraph.graph
end = struct
structure P = PortableGraph
structure S = TextIO.StreamIO
exception ParseError of string
fun input ins = let
val s = TextIO.getInstream ins
fun skipLine s = getOpt (Option.map #2 (S.inputLine s), s)
fun allof l s = foldl (fn (f, s) => f s) s l
fun skipWS s =
case S.input1 s of
NONE => s
| SOME (c, s') => if Char.isSpace c then skipWS s' else s
fun maybeident s = let
val s = skipWS s
val finish = String.implode o rev
fun loop (s, a) =
case S.input1 s of
NONE => SOME (finish a, s)
| SOME (c, s') => if Char.isAlphaNum c then loop (s', c :: a)
else SOME (finish a, s)
in
case S.input1 s of
NONE => NONE
| SOME (c, s') => if Char.isAlpha c then loop (s', [c])
else NONE
end
fun ident s =
case maybeident s of
NONE => raise ParseError "expected: identifier"
| SOME (i, s') => (i, s')
fun maybestring s = let
val s = skipWS s
fun eof () = raise ParseError "unexpected EOF in string"
fun loop (s, a) =
case S.input1 s of
NONE => eof ()
| SOME (#"\"", s') =>
(case String.fromString (String.implode (rev a)) of
SOME x => SOME (x, s')
| NONE => raise ParseError "illegal string syntax")
| SOME (#"\\", s') =>
(case S.input1 s' of
NONE => eof ()
| SOME (c, s'') => loop (s'', c :: #"\\" :: a))
| SOME (c, s') => loop (s', c :: a)
in
case S.input1 s of
SOME (#"\"", s') => loop (s', [])
| _ => raise ParseError "expected: string"
end
fun string s =
case maybestring s of
NONE => raise ParseError "expected: string"
| SOME (x, s') => (x, s')
fun expect c s = let
val s = skipWS s
fun notc what =
raise ParseError (concat ["expected: ", Char.toString c,
", found: ", what])
in
case S.input1 s of
NONE => notc "EOF"
| SOME (c', s') => if c = c' then s' else notc (Char.toString c')
end
fun expectId i s = let
val (i', s') = ident s
in
if i = i' then s'
else raise ParseError (concat ["expected: ", i, ", found: ", i'])
end
fun varlist s = let
fun eof () = raise ParseError "unexpected EOF in varlist"
val s = allof [expect #"[", skipWS] s
fun rest s = let
val s = skipWS s
in
case S.input1 s of
NONE => eof ()
| SOME (#"]", s') => ([], s')
| SOME (#",", s') => let
val (h, s'') = ident s'
val (t, s''') = rest s''
in
(h :: t, s''')
end
| SOME (c, _) =>
raise ParseError
(concat ["expected , or ], found: ",
Char.toString c])
end
in
case S.input1 s of
NONE => eof ()
| SOME (#"]", s') => ([], s')
| SOME _ => let
val (h, s') = ident s
val (t, s'') = rest s'
in
(h :: t, s'')
end
end
fun def s =
case maybeident s of
SOME ("val", s) =>
let val s = allof [expect #"(", expectId "c", expect #","] s
val (lhs, s) = ident s
val s = allof [expect #")", expect #"="] s
val (f, s) = ident s
val s = expectId "c" s
fun def (rhs, s) =
SOME (P.DEF { lhs = lhs, rhs = rhs }, s)
fun comp native = let
val (r, s) = string s
val (e, s) = ident s
val (ss, s) = ident s
in
def (P.COMPILE { src = (r, native),
env = e, syms = ss },
s)
end
fun sym ns = let
val (n, s) = string s
in
def (P.SYM (ns, n), s)
end
in
case f of
"syms" => let
val (l, s) = varlist s
in
def (P.SYMS l, s)
end
| "import" => let
val (l, s) = ident s
val (ss, s) = ident s
in
def (P.IMPORT { lib = l, syms = ss }, s)
end
| "compile" => comp false
| "ncompile" => comp true
| "merge" => let
val (l, s) = varlist s
in
def (P.MERGE l, s)
end
| "filter" => let
val (e, s) = ident s
val (ss, s) = ident s
in
def (P.FILTER { env = e, syms = ss }, s)
end
| "sgn" => sym P.SGN
| "str" => sym P.STR
| "fct" => sym P.FCT
| x => raise ParseError ("unknown function: " ^ x)
end
| _ => NONE
fun deflist s = let
fun loop (s, a) =
case def s of
SOME (d, s') => loop (s', d :: a)
| NONE => (rev a, s)
in
loop (s, [])
end
fun graph s = let
val s = allof [skipLine, expectId "fn"] s
val (imports, s) = varlist s
val s = allof [expect #"=", expect #">", expectId "let",
expectId "open", expectId "PGOps"] s
val (defs, s) = deflist s
val s = allof [expectId "in", expectId "export", expectId "c"] s
val (export, s) = ident s
(* gobble up remaining boilerplate... *)
val s = allof [expectId "end", expect #"|", expect #"_",
expect #"=", expect #">", expectId "raise",
expectId "Fail", #2 o string, expect #")",
skipLine]
s
in
TextIO.setInstream (ins, s);
P.GRAPH { imports = imports, defs = defs, export = export }
end
in
graph s
end
end
|
