(*  Title:      Pure/Isar/outer_parse.ML

    ID:         $Id$

    Author:     Markus Wenzel, TU Muenchen

Generic parsers for Isabelle/Isar outer syntax.

*)

signature OUTER_PARSE =

sig

  type token

  val group: string -> (token list -> 'a) -> token list -> 'a

  val !!! : (token list -> 'a) -> token list -> 'a

  val $$$ : string -> token list -> string * token list

  val position: (token list -> 'a * 'b) -> token list -> ('a * Position.T) * 'b

  val keyword: token list -> string * token list

  val short_ident: token list -> string * token list

  val long_ident: token list -> string * token list

  val sym_ident: token list -> string * token list

  val term_var: token list -> string * token list

  val text_var: token list -> string * token list

  val type_ident: token list -> string * token list

  val type_var: token list -> string * token list

  val number: token list -> string * token list

  val string: token list -> string * token list

  val verbatim: token list -> string * token list

  val eof: token list -> string * token list

  val not_eof: token list -> token * token list

  val nat: token list -> int * token list

  val enum: string -> (token list -> 'a * token list) -> token list -> 'a list * token list

  val enum1: string -> (token list -> 'a * token list) -> token list -> 'a list * token list

  val list: (token list -> 'a * token list) -> token list -> 'a list * token list

  val list1: (token list -> 'a * token list) -> token list -> 'a list * token list

  val and_list: (token list -> 'a * token list) -> token list -> 'a list * token list

  val and_list1: (token list -> 'a * token list) -> token list -> 'a list * token list

  val name: token list -> bstring * token list

  val xname: token list -> xstring * token list

  val text: token list -> string * token list

  val comment: token list -> string * token list

  val sort: token list -> xsort * token list

  val arity: token list -> (xsort list * xsort) * token list

  val simple_arity: token list -> (xsort list * xclass) * token list

  val type_args: token list -> string list * token list

  val typ: token list -> string * token list

  val opt_infix: token list -> Syntax.mixfix * token list

  val opt_mixfix: token list -> Syntax.mixfix * token list

  val const: token list -> (bstring * string * Syntax.mixfix) * token list

  val term: token list -> string * token list

  val prop: token list -> string * token list

  val attribs: token list -> Args.src list * token list

  val opt_attribs: token list -> Args.src list * token list

  val thm_name: string -> token list -> (bstring * Args.src list) * token list

  val opt_thm_name: string -> token list -> (bstring * Args.src list) * token list

  val spec_name: token list -> ((bstring * string) * Args.src list) * token list

  val spec_opt_name: token list -> ((bstring * string) * Args.src list) * token list

  val xthm: token list -> (xstring * Args.src list) * token list

  val xthms1: token list -> (xstring * Args.src list) list * token list

  val method: token list -> Method.text * token list

  val triple1: ('a * 'b) * 'c -> 'a * 'b * 'c

  val triple2: 'a * ('b * 'c) -> 'a * 'b * 'c

  val triple_swap: ('a * 'b) * 'c -> ('a * 'c) * 'b

end;

structure OuterParse: OUTER_PARSE =

struct

type token = OuterLex.token;

(** error handling **)

(* group atomic parsers (no cuts!) *)

fun fail_with s = Scan.fail_with

  (fn [] => s ^ " expected (past end-of-file!)"

    | (tok :: _) => s ^ " expected,\nbut " ^ OuterLex.name_of tok ^ " " ^

      quote (OuterLex.val_of tok) ^ OuterLex.pos_of tok ^ " was found");

fun group s scan = scan || fail_with s;

(* cut *)

fun !!! scan =

  let

    fun get_pos [] = " (past end-of-file!)"

      | get_pos (tok :: _) = OuterLex.pos_of tok;

    fun err (toks, None) = "Outer syntax error" ^ get_pos toks

      | err (toks, Some msg) = "Outer syntax error" ^ get_pos toks ^ ": " ^ msg;

  in Scan.!! err scan end;

(** basic parsers **)

(* utils *)

fun triple1 ((x, y), z) = (x, y, z);

fun triple2 (x, (y, z)) = (x, y, z);

fun triple_swap ((x, y), z) = ((x, z), y);

(* tokens *)

fun position scan =

  (Scan.ahead (Scan.one OuterLex.not_eof) >> OuterLex.position_of) -- scan >> Library.swap;

fun kind k =

  group (OuterLex.str_of_kind k)

    (Scan.one (OuterLex.is_kind k) >> OuterLex.val_of);

val keyword = kind OuterLex.Keyword;

val short_ident = kind OuterLex.Ident;

val long_ident = kind OuterLex.LongIdent;

val sym_ident = kind OuterLex.SymIdent;

val term_var = kind OuterLex.Var;

val text_var = kind OuterLex.TextVar;

val type_ident = kind OuterLex.TypeIdent;

val type_var = kind OuterLex.TypeVar;

val number = kind OuterLex.Nat;

val string = kind OuterLex.String;

val verbatim = kind OuterLex.Verbatim;

val eof = kind OuterLex.EOF;

fun $$$ x =

  group (OuterLex.str_of_kind OuterLex.Keyword ^ " " ^ quote x)

    (Scan.one (OuterLex.is_kind OuterLex.Keyword andf (equal x o OuterLex.val_of))

      >> OuterLex.val_of);

val nat = number >> (fst o Term.read_int o Symbol.explode);

val not_eof = Scan.one OuterLex.not_eof;

(* enumerations *)

fun enum1 sep scan = scan -- Scan.repeat ($$$ sep |-- !!! scan) >> op ::;

fun enum sep scan = enum1 sep scan || Scan.succeed [];

fun list1 scan = enum1 "," scan;

fun list scan = enum "," scan;

fun and_list1 scan = enum1 "and" scan;

fun and_list scan = enum "and" scan;

(* names and text *)

val name = group "name declaration" (short_ident || sym_ident || string);

val xname = group "name reference" (short_ident || long_ident || sym_ident || string);

val text = group "text" (short_ident || long_ident || string || verbatim);

val comment = Scan.optional ($$$ "--" |-- text) "";

(* sorts and arities *)

val sort =

  xname >> single || $$$ "{" |-- !!! (list xname --| $$$ "}");

fun gen_arity cod =

  Scan.optional ($$$ "(" |-- !!! (Scan.repeat1 sort --| $$$ ")")) [] -- cod;

val arity = gen_arity sort;

val simple_arity = gen_arity name;

(* types *)

val typ =

  group "type" (short_ident || long_ident || type_ident || type_var || string);

val type_args =

  type_ident >> single ||

  $$$ "(" |-- !!! (list1 type_ident --| $$$ ")") ||

  Scan.succeed [];

(* mixfix annotations *)

val infxl = $$$ "infixl" |-- !!! (nat >> Syntax.Infixl || string -- nat >> Syntax.InfixlName);

val infxr = $$$ "infixr" |-- !!! (nat >> Syntax.Infixr || string -- nat >> Syntax.InfixrName);

val binder =

  $$$ "binder" |--

    !!! (string -- ($$$ "[" |-- nat --| $$$ "]" -- nat || nat >> (fn n => (n, n))))

  >> (Syntax.Binder o triple2);

val opt_pris = Scan.optional ($$$ "[" |-- !!! (list nat --| $$$ "]")) [];

val mixfix =

  string -- opt_pris -- Scan.optional nat Syntax.max_pri

  >> (Syntax.Mixfix o triple1);

fun opt_fix fix =

  Scan.optional ($$$ "(" |-- !!! (fix --| $$$ ")")) Syntax.NoSyn;

val opt_infix = opt_fix (infxl || infxr);

val opt_mixfix = opt_fix (mixfix || binder || infxl || infxr);

(* consts *)

val const =

  name -- ($$$ "::" |-- !!! (typ -- opt_mixfix)) >> triple2;

(* terms *)

val trm = short_ident || long_ident || term_var || text_var || string;

val term = group "term" trm;

val prop = group "proposition" trm;

(* arguments *)

val keyword_symid = Scan.one (OuterLex.keyword_pred OuterLex.is_sid) >> OuterLex.val_of;

fun atom_arg blk =

  group "argument"

    (position (short_ident || long_ident || sym_ident || term_var || text_var ||

        type_ident || type_var || number) >> Args.ident ||

      position keyword_symid >> Args.keyword ||

      position string >> Args.string ||

      position (if blk then $$$ "," else Scan.fail) >> Args.keyword);

fun paren_args l r scan = position ($$$ l) -- !!! (scan true -- position ($$$ r))

  >> (fn (x, (ys, z)) => Args.keyword x :: ys @ [Args.keyword z]);

fun args blk x = Scan.optional (args1 blk) [] x

and args1 blk x =

  ((Scan.repeat1

    (Scan.repeat1 (atom_arg blk) ||

      paren_args "(" ")" args ||

      paren_args "{" "}" args ||

      paren_args "[" "]" args)) >> flat) x;

(* theorem specifications *)

val attrib = position (xname -- !!! (args false)) >> Args.src;

val attribs = $$$ "[" |-- !!! (list attrib --| $$$ "]");

val opt_attribs = Scan.optional attribs [];

fun thm_name s = name -- opt_attribs --| $$$ s;

fun opt_thm_name s = Scan.optional (thm_name s) ("", []);

val spec_name = thm_name ":" -- prop >> (fn ((x, y), z) => ((x, z), y));

val spec_opt_name = opt_thm_name ":" -- prop >> (fn ((x, y), z) => ((x, z), y));

val xthm = xname -- opt_attribs;

val xthms1 = Scan.repeat1 xthm;

(* proof methods *)

fun meth4 x =

 (position (xname >> rpair []) >> (Method.Source o Args.src) ||

  $$$ "(" |-- meth0 --| $$$ ")") x

and meth3 x =

 (meth4 --| $$$ "?" >> Method.Try ||

  meth4 --| $$$ "*" >> Method.Repeat ||

  meth4 --| $$$ "+" >> Method.Repeat1 ||

  meth4) x

and meth2 x =

 (position (xname -- args1 false) >> (Method.Source o Args.src) ||

  meth3) x

and meth1 x = (enum1 "," meth2 >> (fn [m] => m | ms => Method.Then ms)) x

and meth0 x = (enum1 "|" meth1 >> (fn [m] => m | ms => Method.Orelse ms)) x;

val method = meth3;

end;