--- a/src/Tools/Compute_Oracle/am_util.ML Mon Jul 09 11:44:23 2007 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,172 +0,0 @@
-(* Title: Tools/Compute_Oracle/am_util.ML
- ID: $Id$
- Author: Steven Obua
-*)
-
-signature AM_UTIL = sig
-
- type naming (* = string -> int *)
-
- exception Parse of string
- exception Tokenize
-
- (* takes a naming for the constants *)
- val read_rule : naming -> string -> AbstractMachine.pattern * AbstractMachine.term
-
- (* takes a naming for the constants and one for the free variables *)
- val read_term : naming -> naming -> string -> AbstractMachine.term
-
- val term_ord : AbstractMachine.term * AbstractMachine.term -> order
-
-end
-
-structure AM_Util : AM_UTIL =
-struct
-
-fun term_ord (AbstractMachine.Var x, AbstractMachine.Var y) = int_ord (x,y)
- | term_ord (AbstractMachine.Const c1, AbstractMachine.Const c2) = int_ord (c1, c2)
- | term_ord (AbstractMachine.App a1, AbstractMachine.App a2) =
- prod_ord term_ord term_ord (a1, a2)
- | term_ord (AbstractMachine.Abs m1, AbstractMachine.Abs m2) = term_ord (m1, m2)
- | term_ord (AbstractMachine.Const _, _) = LESS
- | term_ord (AbstractMachine.Var _, AbstractMachine.Const _ ) = GREATER
- | term_ord (AbstractMachine.Var _, _) = LESS
- | term_ord (AbstractMachine.App _, AbstractMachine.Abs _) = LESS
- | term_ord (AbstractMachine.App _, _) = GREATER
- | term_ord (AbstractMachine.Abs _, _) = LESS
-
-type naming = string -> int
-
-datatype token =
- TokenConst of string | TokenLeft | TokenRight | TokenVar of string |
- TokenLambda | TokenDot | TokenNone | TokenEq
-
-exception Tokenize;
-
-fun tokenize s =
- let
- fun is_lower c = "a" <= c andalso c <= "z";
- val is_alphanum = Symbol.is_ascii_letter orf Symbol.is_ascii_digit;
- fun tz TokenNone [] = []
- | tz x [] = [x]
- | tz TokenNone (c::cs) =
- if Symbol.is_ascii_blank c then tz TokenNone cs
- else if is_lower c then (tz (TokenVar c) cs)
- else if is_alphanum c then (tz (TokenConst c) cs)
- else if c = "%" then (TokenLambda :: (tz TokenNone cs))
- else if c = "." then (TokenDot :: (tz TokenNone cs))
- else if c = "(" then (TokenLeft :: (tz TokenNone cs))
- else if c = ")" then (TokenRight :: (tz TokenNone cs))
- else if c = "=" then (TokenEq :: (tz TokenNone cs))
- else raise Tokenize
- | tz (TokenConst s) (c::cs) =
- if is_alphanum c then (tz (TokenConst (s ^ c)) cs)
- else (TokenConst s)::(tz TokenNone (c::cs))
- | tz (TokenVar s) (c::cs) =
- if is_alphanum c then (tz (TokenVar (s ^ c)) cs)
- else (TokenVar s)::(tz TokenNone (c::cs))
- | tz _ _ = raise Tokenize
- in tz TokenNone (explode s) end
-
-exception Parse of string;
-
-fun cons x xs =
- if List.exists (fn y => x = y) xs then raise (Parse ("variable occurs twice: "^x))
- else (x::xs)
-
-fun parse_pattern f pvars ((TokenConst c)::ts) =
- let
- val (pvars, ts, plist) = parse_pattern_list f pvars ts
- in
- (pvars, ts, AbstractMachine.PConst (f c, plist))
- end
- | parse_pattern _ _ _ = raise (Parse "parse_pattern: constant expected")
-and parse_pattern_single f pvars ((TokenVar x)::ts) = (cons x pvars, ts, AbstractMachine.PVar)
- | parse_pattern_single f pvars ((TokenConst c)::ts) = (pvars, ts, AbstractMachine.PConst (f c, []))
- | parse_pattern_single f pvars (TokenLeft::ts) =
- let
- val (pvars, ts, p) = parse_pattern f pvars ts
- in
- case ts of
- TokenRight::ts => (pvars, ts, p)
- | _ => raise (Parse "parse_pattern_single: closing bracket expected")
- end
- | parse_pattern_single _ _ _ = raise (Parse "parse_pattern_single: got stuck")
-and parse_pattern_list f pvars (TokenEq::ts) = (pvars, TokenEq::ts, [])
- | parse_pattern_list f pvars (TokenRight::ts) = (pvars, TokenRight::ts, [])
- | parse_pattern_list f pvars ts =
- let
- val (pvars, ts, p) = parse_pattern_single f pvars ts
- val (pvars, ts, ps) = parse_pattern_list f pvars ts
- in
- (pvars, ts, p::ps)
- end
-
-fun app_terms x (t::ts) = app_terms (AbstractMachine.App (x, t)) ts
- | app_terms x [] = x
-
-fun parse_term_single f vars ((TokenConst c)::ts) = (ts, AbstractMachine.Const (f c))
- | parse_term_single f vars ((TokenVar v)::ts) = (ts, AbstractMachine.Var (vars v))
- | parse_term_single f vars (TokenLeft::ts) =
- let
- val (ts, term) = parse_term f vars ts
- in
- case ts of
- TokenRight::ts => (ts, term)
- | _ => raise Parse ("parse_term_single: closing bracket expected")
- end
- | parse_term_single f vars (TokenLambda::(TokenVar x)::TokenDot::ts) =
- let
- val (ts, term) = parse_term f (fn s => if s=x then 0 else (vars s)+1) ts
- in
- (ts, AbstractMachine.Abs term)
- end
- | parse_term_single _ _ _ = raise Parse ("parse_term_single: got stuck")
-and parse_term_list f vars [] = ([], [])
- | parse_term_list f vars (TokenRight::ts) = (TokenRight::ts, [])
- | parse_term_list f vars ts =
- let
- val (ts, term) = parse_term_single f vars ts
- val (ts, terms) = parse_term_list f vars ts
- in
- (ts, term::terms)
- end
-and parse_term f vars ts =
- let
- val (ts, terms) = parse_term_list f vars ts
- in
- case terms of
- [] => raise (Parse "parse_term: no term found")
- | (t::terms) => (ts, app_terms t terms)
- end
-
-fun read_rule f s =
- let
- val t = tokenize s
- val (v, ts, pattern) = parse_pattern f [] t
- fun vars [] (x:string) = raise (Parse "read_rule.vars: variable not found")
- | vars (v::vs) x = if v = x then 0 else (vars vs x)+1
- in
- case ts of
- TokenEq::ts =>
- let
- val (ts, term) = parse_term f (vars v) ts
- in
- case ts of
- [] => (pattern, term)
- | _ => raise (Parse "read_rule: still tokens left, end expected")
- end
- | _ => raise (Parse ("read_rule: = expected"))
- end
-
-fun read_term f g s =
- let
- val t = tokenize s
- val (ts, term) = parse_term f g t
- in
- case ts of
- [] => term
- | _ => raise (Parse ("read_term: still tokens left, end expected"))
- end
-
-end