src/Pure/Isar/args.ML
author wenzelm
Tue May 17 18:10:40 2005 +0200 (2005-05-17)
changeset 15987 35ec4802c66c
parent 15726 67e9ed435df7
child 16140 fc51e61d45fb
permissions -rw-r--r--
Syntax.read_variable;
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(*  Title:      Pure/Isar/args.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Concrete argument syntax of attributes, methods etc. -- with special
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support for embedded values and static binding.
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*)
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signature ARGS =
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sig
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  datatype value = Name of string | Typ of typ | Term of term | Fact of thm list |
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    Attribute of theory attribute * ProofContext.context attribute
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  type T
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  val string_of: T -> string
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  val mk_ident: string * Position.T -> T
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  val mk_string: string * Position.T -> T
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  val mk_keyword: string * Position.T -> T
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  val mk_name: string -> T
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  val mk_typ: typ -> T
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  val mk_term: term -> T
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  val mk_fact: thm list -> T
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  val mk_attribute: theory attribute * ProofContext.context attribute -> T
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  val stopper: T * (T -> bool)
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  val not_eof: T -> bool
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  type src
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  val src: (string * T list) * Position.T -> src
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  val dest_src: src -> (string * T list) * Position.T
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  val map_name: (string -> string) -> src -> src
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  val map_values: (string -> string) -> (typ -> typ) -> (term -> term) -> (thm -> thm)
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    -> src -> src
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  val assignable: src -> src
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  val assign: value option -> T -> unit
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  val closure: src -> src
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  val position: (T list -> 'a * 'b) -> T list -> ('a * Position.T) * 'b
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  val !!! : (T list -> 'a) -> T list -> 'a
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  val $$$ : string -> T list -> string * T list
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  val add: T list -> string * T list
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  val del: T list -> string * T list
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  val colon: T list -> string * T list
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  val query: T list -> string * T list
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  val bang: T list -> string * T list
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  val query_colon: T list -> string * T list
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  val bang_colon: T list -> string * T list
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  val parens: (T list -> 'a * T list) -> T list -> 'a * T list
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  val bracks: (T list -> 'a * T list) -> T list -> 'a * T list
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  val mode: string -> 'a * T list -> bool * ('a * T list)
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  val maybe: (T list -> 'a * T list) -> T list -> 'a option * T list
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  val name: T list -> string * T list
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  val nat: T list -> int * T list
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  val int: T list -> int * T list
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  val var: T list -> indexname * T list
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  val list: (T list -> 'a * T list) -> T list -> 'a list * T list
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  val list1: (T list -> 'a * T list) -> T list -> 'a list * T list
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  val enum: string -> ('a * T list -> 'b * ('a * T list)) -> 'a * T list -> 'b list * ('a * T list)
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  val enum1: string -> ('a * T list -> 'b * ('a * T list)) -> 'a * T list -> 'b list * ('a * T list)
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  val and_list: ('a * T list -> 'b * ('a * T list)) -> 'a * T list -> 'b list * ('a * T list)
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  val and_list1: ('a * T list -> 'b * ('a * T list)) -> 'a * T list -> 'b list * ('a * T list)
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  val ahead: T list -> T * T list
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  val internal_name: T list -> string * T list
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  val internal_typ: T list -> typ * T list
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  val internal_term: T list -> term * T list
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  val internal_fact: T list -> thm list * T list
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  val internal_attribute: T list ->
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    (theory attribute * ProofContext.context attribute) * T list
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  val named_name: (string -> string) -> T list -> string * T list
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  val named_typ: (string -> typ) -> T list -> typ * T list
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  val named_term: (string -> term) -> T list -> term * T list
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  val named_fact: (string -> thm list) -> T list -> thm list * T list
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  val global_typ_raw: theory * T list -> typ * (theory * T list)
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  val global_typ: theory * T list -> typ * (theory * T list)
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  val global_term: theory * T list -> term * (theory * T list)
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  val global_prop: theory * T list -> term * (theory * T list)
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  val local_typ_raw: ProofContext.context * T list -> typ * (ProofContext.context * T list)
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  val local_typ: ProofContext.context * T list -> typ * (ProofContext.context * T list)
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  val local_term: ProofContext.context * T list -> term * (ProofContext.context * T list)
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  val local_prop: ProofContext.context * T list -> term * (ProofContext.context * T list)
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  val global_tyname: theory * T list -> string * (theory * T list)
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  val global_const: theory * T list -> string * (theory * T list)
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  val local_tyname: ProofContext.context * T list -> string * (ProofContext.context * T list)
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  val local_const: ProofContext.context * T list -> string * (ProofContext.context * T list)
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  val thm_sel: T list -> PureThy.interval list * T list
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  val bang_facts: ProofContext.context * T list -> thm list * (ProofContext.context * T list)
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  val goal_spec: ((int -> tactic) -> tactic) -> ('a * T list)
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    -> ((int -> tactic) -> tactic) * ('a * T list)
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  val attribs: (string -> string) -> T list -> src list * T list
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  val opt_attribs: (string -> string) -> T list -> src list * T list
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  val syntax: string -> ('a * T list -> 'b * ('a * T list)) -> src -> 'a -> 'a * 'b
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  val pretty_src: ProofContext.context -> src -> Pretty.T
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  val pretty_attribs: ProofContext.context -> src list -> Pretty.T list
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end;
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structure Args: ARGS =
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struct
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(** datatype T **)
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(*An argument token is a symbol (with raw string value), together with
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  an optional assigned internal value.  Note that an assignable ref
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  designates an intermediate state of internalization -- it is NOT
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  meant to persist.*)
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datatype kind = Ident | String | Keyword | EOF;
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type symbol = kind * string * Position.T;
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datatype value =
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  Name of string |
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  Typ of typ |
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  Term of term |
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  Fact of thm list |
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  Attribute of theory attribute * ProofContext.context attribute;
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datatype slot =
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  Empty |
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  Value of value option |
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  Assignable of value option ref;
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datatype T = Arg of symbol * slot;
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fun string_of (Arg ((Ident, x, _), _)) = x
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  | string_of (Arg ((String, x, _), _)) = Library.quote x
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  | string_of (Arg ((Keyword, x, _), _)) = x
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  | string_of (Arg ((EOF, _, _), _)) = "";
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fun sym_of (Arg ((_, x, _), _)) = x;
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fun pos_of (Arg ((_, _, pos), _)) = pos;
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(* basic constructors *)
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fun mk_symbol k (x, p) = Arg ((k, x, p), Empty);
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fun mk_value k v = Arg ((Keyword, k, Position.none), Value (SOME v));
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val mk_ident = mk_symbol Ident;
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val mk_string = mk_symbol String;
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val mk_keyword = mk_symbol Keyword;
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val mk_name = mk_value "<name>" o Name;
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val mk_typ = mk_value "<typ>" o Typ;
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val mk_term = mk_value "<term>" o Term;
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val mk_fact = mk_value "<fact>" o Fact;
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val mk_attribute = mk_value "<attribute>" o Attribute;
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(* eof *)
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val eof = mk_symbol EOF ("", Position.none);
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fun is_eof (Arg ((EOF, _, _), _)) = true
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  | is_eof _ = false;
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val stopper = (eof, is_eof);
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val not_eof = not o is_eof;
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(** datatype src **)
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datatype src = Src of (string * T list) * Position.T;
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val src = Src;
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fun dest_src (Src src) = src;
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fun map_name f (Src ((s, args), pos)) = Src ((f s, args), pos);
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fun map_args f (Src ((s, args), pos)) = Src ((s, map f args), pos);
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(* values *)
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fun map_value f (Arg (s, Value (SOME v))) = Arg (s, Value (SOME (f v)))
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  | map_value _ arg = arg;
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fun map_values f g h i = map_args (map_value
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  (fn Name s => Name (f s)
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    | Typ T => Typ (g T)
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    | Term t => Term (h t)
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    | Fact ths => Fact (map i ths)
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    | Attribute att => Attribute att));
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(* static binding *)
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(*1st stage: make empty slots assignable*)
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val assignable =
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  map_args (fn Arg (s, Empty) => Arg (s, Assignable (ref NONE)) | arg => arg);
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(*2nd stage: assign values as side-effect of scanning*)
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fun assign v (arg as Arg (_, Assignable r)) = r := v
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  | assign _ _ = ();
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val ahead = Scan.ahead (Scan.one not_eof);
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fun touch scan = ahead -- scan >> (fn (arg, y) => (assign NONE arg; y));
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(*3rd stage: static closure of final values*)
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val closure =
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  map_args (fn Arg (s, Assignable (ref v)) => Arg (s, Value v) | arg => arg);
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(** scanners **)
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(* position *)
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fun position scan =
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  (Scan.ahead (Scan.one not_eof) >> pos_of) -- scan >> Library.swap;
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(* cut *)
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fun !!! scan =
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  let
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    fun get_pos [] = " (past end-of-text!)"
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      | get_pos (arg :: _) = Position.str_of (pos_of arg);
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    fun err (args, NONE) = "Argument syntax error" ^ get_pos args
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      | err (args, SOME msg) = "Argument syntax error" ^ get_pos args ^ ": " ^ msg;
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  in Scan.!! err scan end;
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(* basic *)
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fun some_ident f =
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  touch (Scan.some (fn Arg ((Ident, x, _), _) => f x | _ => NONE));
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val named =
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  touch (Scan.one (fn Arg ((k, _, _), _) => k = Ident orelse k = String));
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val symbolic =
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  touch (Scan.one (fn Arg ((k, x, _), _) => k = Keyword andalso OuterLex.is_sid x));
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fun &&& x =
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  touch (Scan.one (fn Arg ((k, y, _), _) => k = Keyword andalso x = y));
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fun $$$ x =
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  touch (Scan.one (fn Arg ((k, y, _), _) => (k = Ident orelse k = Keyword) andalso x = y) >> sym_of);
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val add = $$$ "add";
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val del = $$$ "del";
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val colon = $$$ ":";
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val query = $$$ "?";
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val bang = $$$ "!";
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val query_colon = $$$ "?:";
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val bang_colon = $$$ "!:";
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fun parens scan = $$$ "(" |-- scan --| $$$ ")";
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fun bracks scan = $$$ "[" |-- scan --| $$$ "]";
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fun mode s = Scan.lift (Scan.optional (parens ($$$ s) >> K true) false);
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fun maybe scan = $$$ "_" >> K NONE || scan >> SOME;
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val name = named >> sym_of;
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val nat = some_ident Syntax.read_nat;
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val int = Scan.optional ($$$ "-" >> K ~1) 1 -- nat >> op *;
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val var = some_ident Syntax.read_variable;
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(* enumerations *)
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fun list1 scan = scan -- Scan.repeat ($$$ "," |-- scan) >> op ::;
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fun list scan = list1 scan || Scan.succeed [];
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fun enum1 sep scan = scan -- Scan.repeat (Scan.lift ($$$ sep) |-- scan) >> op ::;
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fun enum sep scan = enum1 sep scan || Scan.succeed [];
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fun and_list1 scan = enum1 "and" scan;
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fun and_list scan = enum "and" scan;
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(* values *)
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fun value dest = Scan.some  (*no touch here*)
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  (fn Arg (_, Value (SOME v)) => (SOME (dest v) handle Match => NONE)
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    | Arg _ => NONE);
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fun evaluate mk eval arg =
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  let val x = eval (sym_of arg) in (assign (SOME (mk x)) arg; x) end;
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val internal_name = value (fn Name s => s);
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val internal_typ = value (fn Typ T => T);
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val internal_term = value (fn Term t => t);
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val internal_fact = value (fn Fact ths => ths);
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val internal_attribute = value (fn Attribute att => att);
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fun named_name intern = internal_name || named >> evaluate Name intern;
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fun named_typ readT = internal_typ || named >> evaluate Typ readT;
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fun named_term read = internal_term || named >> evaluate Term read;
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fun named_fact get = internal_fact || named >> evaluate Fact get;
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(* terms and types *)
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val global_typ_raw = Scan.peek (named_typ o ProofContext.read_typ_raw o ProofContext.init);
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val global_typ = Scan.peek (named_typ o ProofContext.read_typ o ProofContext.init);
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val global_term = Scan.peek (named_term o ProofContext.read_term o ProofContext.init);
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val global_prop = Scan.peek (named_term o ProofContext.read_prop o ProofContext.init);
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val local_typ_raw = Scan.peek (named_typ o ProofContext.read_typ_raw);
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val local_typ = Scan.peek (named_typ o ProofContext.read_typ);
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val local_term = Scan.peek (named_term o ProofContext.read_term);
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val local_prop = Scan.peek (named_term o ProofContext.read_prop);
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(* type and constant names *)
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val dest_tyname = fn Type (c, _) => c | TFree (a, _) => a | _ => "";
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val dest_const = fn Const (c, _) => c | Free (x, _) => x | _ => "";
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val global_tyname = Scan.peek (named_typ o Sign.read_tyname o Theory.sign_of) >> dest_tyname;
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val global_const = Scan.peek (named_term o Sign.read_const o Theory.sign_of) >> dest_const;
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val local_tyname = Scan.peek (named_typ o ProofContext.read_tyname) >> dest_tyname;
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val local_const = Scan.peek (named_term o ProofContext.read_const) >> dest_const;
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(* misc *)
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val thm_sel = parens (list1
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 (nat --| $$$ "-" -- nat >> PureThy.FromTo ||
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  nat --| $$$ "-" >> PureThy.From ||
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  nat >> PureThy.Single));
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val bang_facts = Scan.peek (fn ctxt =>
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  $$$ "!" >> K (ProofContext.prems_of ctxt) || Scan.succeed []);
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(* goal specification *)
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(* range *)
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val from_to =
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  nat -- ($$$ "-" |-- nat) >> (fn (i, j) => fn tac => Seq.INTERVAL tac i j) ||
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  nat --| $$$ "-" >> (fn i => fn tac => fn st => Seq.INTERVAL tac i (Thm.nprems_of st) st) ||
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  nat >> (fn i => fn tac => tac i) ||
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  $$$ "!" >> K ALLGOALS;
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val goal = $$$ "[" |-- !!! (from_to --| $$$ "]");
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fun goal_spec def = Scan.lift (Scan.optional goal def);
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wenzelm@8233
   338
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(* attribs *)
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local
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val exclude = explode "()[],";
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fun atomic blk = touch (Scan.one (fn Arg ((k, x, _), _) =>
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    k <> Keyword orelse not (x mem exclude) orelse blk andalso x = ","));
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fun args blk x = Scan.optional (args1 blk) [] x
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and args1 blk x =
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  ((Scan.repeat1
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    (Scan.repeat1 (atomic blk) ||
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      argsp "(" ")" ||
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      argsp "[" "]")) >> List.concat) x
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and argsp l r x =
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  (Scan.trace (&&& l -- !!! (args true -- &&& r)) >> #2) x;
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in
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fun attribs intern =
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  let
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    val attrib_name = internal_name || (symbolic || named) >> evaluate Name intern;
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    val attrib = position (attrib_name -- !!! (args false)) >> src;
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  in $$$ "[" |-- !!! (list attrib --| $$$ "]") end;
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fun opt_attribs intern = Scan.optional (attribs intern) [];
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   367
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   368
end;
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   369
wenzelm@5822
   370
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   371
(* syntax interface *)
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fun syntax kind scan (src as Src ((s, args), pos)) st =
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  (case Scan.error (Scan.finite' stopper (Scan.option scan)) (st, args) of
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    (SOME x, (st', [])) => (st', x)
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  | (_, (_, args')) =>
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      error (kind ^ " " ^ quote s ^ Position.str_of pos ^ ": bad arguments\n  " ^
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        space_implode " " (map string_of args')));
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   379
wenzelm@5878
   380
wenzelm@5878
   381
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   382
(** pretty printing **)
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   383
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fun pretty_src ctxt src =
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  let
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    fun prt (Arg (_, Value (SOME (Name s)))) = Pretty.str (quote s)
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      | prt (Arg (_, Value (SOME (Typ T)))) = ProofContext.pretty_typ ctxt T
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      | prt (Arg (_, Value (SOME (Term t)))) = ProofContext.pretty_term ctxt t
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      | prt (Arg (_, Value (SOME (Fact ths)))) = ProofContext.pretty_thms ctxt ths
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      | prt arg = Pretty.str (string_of arg);
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    val (s, args) = #1 (dest_src src);
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  in Pretty.block (Pretty.breaks (Pretty.str s :: map prt args)) end;
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   393
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fun pretty_attribs _ [] = []
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  | pretty_attribs ctxt srcs =
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   396
      [Pretty.enclose "[" "]" (Pretty.commas (map (pretty_src ctxt) srcs))];
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   397
wenzelm@5822
   398
end;