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(* Title: HOL/TPTP/TPTP_Parser/tptp_problem_name.ML
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Author: Nik Sultana, Cambridge University Computer Laboratory
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Scans a TPTP problem name. Naming convention is described
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http://www.cs.miami.edu/~tptp/TPTP/TR/TPTPTR.shtml#Problem and Axiomatization Naming
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*)
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signature TPTP_PROBLEM_NAME =
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sig
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datatype suffix =
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Problem of
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((*version*)int *
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(*size parameter*)int option) *
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(*extension*)string
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| Axiom of
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(*specialisation*)int *
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(*extension*)string
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type tptp_problem_name =
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{prob_domain : string,
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prob_number : int,
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prob_form : TPTP_Syntax.language,
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suffix : suffix}
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datatype problem_name =
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Standard of tptp_problem_name
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| Nonstandard of string
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exception TPTP_PROBLEM_NAME of string
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val parse_problem_name : string -> problem_name
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val mangle_problem_name : problem_name -> string
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end
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structure TPTP_Problem_Name: TPTP_PROBLEM_NAME =
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struct
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(*some basic tokens*)
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val numerics = map Char.chr (48 upto 57) (*0..9*)
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val alphabetics =
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map Char.chr (65 upto 90) @ (*A..Z*)
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map Char.chr (97 upto 122) (*a..z*)
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(*TPTP formula forms*)
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val forms = [#"^", #"_", #"=", #"+", #"-"]
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(*lift a list of characters into a scanner combinator matching any one of the
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characters in that list.*)
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fun lift l =
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(map (Char.toString #> ($$)) l, Scan.fail)
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|-> fold (fn x => fn y => x || y)
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(*combinators for parsing letters and numbers*)
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val alpha = lift alphabetics
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val numer = lift numerics
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datatype suffix =
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Problem of
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((*version*)int *
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(*size parameter*)int option) *
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(*extension*)string
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| Axiom of
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(*specialisation*)int *
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(*extension*)string
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val to_int = Int.fromString #> the
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val rm_ending = Scan.this_string "rm"
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val ax_ending =
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((numer >> to_int) --|
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$$ "." -- (Scan.this_string "eq" || Scan.this_string "ax" || rm_ending))
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>> Axiom
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val prob_ending = $$ "p" || $$ "g" || rm_ending
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val prob_suffix =
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((numer >> to_int) --
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Scan.option ($$ "." |-- numer ^^ numer ^^ numer >> to_int) --| $$ "."
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-- prob_ending)
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>> Problem
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type tptp_problem_name =
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{prob_domain : string,
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prob_number : int,
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prob_form : TPTP_Syntax.language,
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suffix : suffix}
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datatype problem_name =
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Standard of tptp_problem_name
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| Nonstandard of string
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exception TPTP_PROBLEM_NAME of string
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(*FIXME add graceful handling on non-wellformed TPTP filenames*)
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fun parse_problem_name str' : problem_name =
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let
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val str = Symbol.explode str'
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(*NOTE there's an ambiguity in the spec: there's no way of knowing if a
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file ending in "rm" used to be "ax" or "p". Here we default to "p".*)
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val ((((prob_domain, prob_number), prob_form), suffix), rest) =
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Scan.finite Symbol.stopper
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((alpha ^^ alpha ^^ alpha) --
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(numer ^^ numer ^^ numer >> to_int) --
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lift forms -- (prob_suffix || ax_ending)) str
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fun parse_form str =
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case str of
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"^" => TPTP_Syntax.THF
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| "_" => TPTP_Syntax.TFF
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| "=" => TPTP_Syntax.TFF_with_arithmetic
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| "+" => TPTP_Syntax.FOF
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| "-" => TPTP_Syntax.CNF
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| _ => raise TPTP_PROBLEM_NAME ("Unknown TPTP form: " ^ str)
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in
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if null rest (*check if the whole name was parsed*)
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then
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Standard
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{prob_domain = prob_domain,
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prob_number = prob_number,
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prob_form = parse_form prob_form,
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suffix = suffix}
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handle _ => Nonstandard str'
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else raise TPTP_PROBLEM_NAME ("Parse error")
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end
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(*Produces an ASCII encoding of a TPTP problem-file name.*)
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fun mangle_problem_name (prob : problem_name) : string =
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case prob of
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Standard tptp_prob =>
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let
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val prob_form =
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case #prob_form tptp_prob of
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TPTP_Syntax.THF => "_thf_"
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| TPTP_Syntax.TFF => "_tff_"
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| TPTP_Syntax.TFF_with_arithmetic => "_thfwa_"
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| TPTP_Syntax.FOF => "_fof_"
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| TPTP_Syntax.CNF => "_cnf_"
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val suffix =
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case #suffix tptp_prob of
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Problem ((version, size), extension) =>
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Int.toString version ^ "_" ^
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(if is_some size then Int.toString (the size) ^ "_" else "") ^
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extension
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| Axiom (specialisation, extension) =>
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Int.toString specialisation ^ "_" ^ extension
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in
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#prob_domain tptp_prob ^
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Int.toString (#prob_number tptp_prob) ^
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prob_form ^
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suffix
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end
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| Nonstandard str => str
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end
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