src/Pure/Isar/outer_parse.ML
author wenzelm
Mon Nov 16 11:00:58 1998 +0100 (1998-11-16)
changeset 5877 ee214dec5657
parent 5826 977f789566b7
child 5917 dcb669fda86b
permissions -rw-r--r--
removed args, args1, thm_xname;
fixed nat: Symbol.explode;
name / xname: include sym_ident;
keyword_symid: include ident;
tuned atom_arg;
support nested args;
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(*  Title:      Pure/Isar/outer_parse.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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Generic parsers for Isabelle/Isar outer syntax.
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*)
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signature OUTER_PARSE =
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sig
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  type token
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  val group: string -> (token list -> 'a) -> token list -> 'a
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  val !!! : (token list -> 'a) -> token list -> 'a
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  val $$$ : string -> token list -> string * token list
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  val position: (token list -> 'a * 'b) -> token list -> ('a * Position.T) * 'b
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  val keyword: token list -> string * token list
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  val short_ident: token list -> string * token list
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  val long_ident: token list -> string * token list
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  val sym_ident: token list -> string * token list
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  val term_var: token list -> string * token list
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  val text_var: token list -> string * token list
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  val type_ident: token list -> string * token list
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  val type_var: token list -> string * token list
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  val number: token list -> string * token list
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  val string: token list -> string * token list
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  val verbatim: token list -> string * token list
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  val eof: token list -> string * token list
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  val not_eof: token list -> token * token list
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  val nat: token list -> int * token list
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  val enum: string -> (token list -> 'a * token list) -> token list -> 'a list * token list
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  val enum1: string -> (token list -> 'a * token list) -> token list -> 'a list * token list
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  val list: (token list -> 'a * token list) -> token list -> 'a list * token list
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  val list1: (token list -> 'a * token list) -> token list -> 'a list * token list
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  val name: token list -> bstring * token list
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  val xname: token list -> xstring * token list
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  val text: token list -> string * token list
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  val sort: token list -> xsort * token list
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  val arity: token list -> (xsort list * xsort) * token list
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  val type_args: token list -> string list * token list
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  val typ: token list -> string * token list
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  val opt_infix: token list -> Syntax.mixfix * token list
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  val opt_mixfix: token list -> Syntax.mixfix * token list
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  val const: token list -> (bstring * string * Syntax.mixfix) * token list
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  val term: token list -> string * token list
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  val prop: token list -> string * token list
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  val attribs: token list -> Args.src list * token list
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  val opt_attribs: token list -> Args.src list * token list
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  val thm_name: token list -> (bstring * Args.src list) * token list
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  val opt_thm_name: token list -> (bstring * Args.src list) * token list
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  val method: token list -> Method.text * token list
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  val triple1: ('a * 'b) * 'c -> 'a * 'b * 'c
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  val triple2: 'a * ('b * 'c) -> 'a * 'b * 'c
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end;
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structure OuterParse: OUTER_PARSE =
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struct
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type token = OuterLex.token;
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(** error handling **)
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(* group atomic parsers (no cuts!) *)
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fun fail_with s = Scan.fail_with
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  (fn [] => s ^ " expected (past end-of-file!)"
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    | (tok :: _) => s ^ " expected,\nbut " ^ OuterLex.name_of tok ^ " " ^
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      quote (OuterLex.val_of tok) ^ OuterLex.pos_of tok ^ " was found");
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fun group s scan = scan || fail_with s;
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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-file!)"
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      | get_pos (tok :: _) = OuterLex.pos_of tok;
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    fun err (toks, None) = "Outer syntax error" ^ get_pos toks
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      | err (toks, Some msg) = "Outer syntax error" ^ get_pos toks ^ ": " ^ msg;
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  in Scan.!! err scan end;
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(** basic parsers **)
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(* utils *)
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fun triple1 ((x, y), z) = (x, y, z);
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fun triple2 (x, (y, z)) = (x, y, z);
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(* tokens *)
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fun position scan =
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  (Scan.ahead (Scan.one OuterLex.not_eof) >> OuterLex.position_of) -- scan >> Library.swap;
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fun kind k =
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  group (OuterLex.str_of_kind k)
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    (Scan.one (OuterLex.is_kind k) >> OuterLex.val_of);
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val keyword = kind OuterLex.Keyword;
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val short_ident = kind OuterLex.Ident;
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val long_ident = kind OuterLex.LongIdent;
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val sym_ident = kind OuterLex.SymIdent;
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val term_var = kind OuterLex.Var;
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val text_var = kind OuterLex.TextVar;
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val type_ident = kind OuterLex.TypeIdent;
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val type_var = kind OuterLex.TypeVar;
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val number = kind OuterLex.Nat;
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val string = kind OuterLex.String;
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val verbatim = kind OuterLex.Verbatim;
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val eof = kind OuterLex.EOF;
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fun $$$ x =
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  group (OuterLex.str_of_kind OuterLex.Keyword ^ " " ^ quote x)
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    (Scan.one (OuterLex.is_kind OuterLex.Keyword andf (equal x o OuterLex.val_of))
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      >> OuterLex.val_of);
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val nat = number >> (fst o Term.read_int o Symbol.explode);
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val not_eof = Scan.one OuterLex.not_eof;
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(* enumerations *)
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fun enum1 sep scan = scan -- Scan.repeat ($$$ sep |-- scan) >> op ::;
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fun enum sep scan = enum1 sep scan || Scan.succeed [];
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fun list1 scan = enum1 "," scan;
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fun list scan = enum "," scan;
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(* names *)
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val name = group "name declaration" (short_ident || sym_ident || string);
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val xname = group "name reference" (short_ident || long_ident || sym_ident || string);
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val text = group "text" (short_ident || long_ident || string || verbatim);
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(* sorts *)
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val sort =
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  xname >> single || $$$ "{" |-- !!! (list xname --| $$$ "}");
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val arity =
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  Scan.optional ($$$ "(" |-- !!! (Scan.repeat1 sort --| $$$ ")")) [] -- sort;
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(* types *)
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val typ =
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  group "type" (short_ident || long_ident || type_ident || type_var || string);
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val type_args =
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  type_ident >> single ||
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  $$$ "(" |-- !!! (list1 type_ident --| $$$ ")") ||
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  Scan.succeed [];
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(* mixfix annotations *)
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val infxl = $$$ "infixl" |-- !!! (nat >> Syntax.Infixl || string -- nat >> Syntax.InfixlName);
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val infxr = $$$ "infixr" |-- !!! (nat >> Syntax.Infixr || string -- nat >> Syntax.InfixrName);
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val binder =
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  $$$ "binder" |--
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    !!! (string -- ($$$ "[" |-- nat --| $$$ "]" -- nat || nat >> (fn n => (n, n))))
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  >> (Syntax.Binder o triple2);
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val opt_pris = Scan.optional ($$$ "[" |-- !!! (list nat --| $$$ "]")) [];
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val mixfix =
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  string -- opt_pris -- Scan.optional nat Syntax.max_pri
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  >> (Syntax.Mixfix o triple1);
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fun opt_fix fix =
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  Scan.optional ($$$ "(" |-- !!! (fix --| $$$ ")")) Syntax.NoSyn;
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val opt_infix = opt_fix (infxl || infxr);
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val opt_mixfix = opt_fix (mixfix || infxl || infxr || binder);
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(* consts *)
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val const =
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  name -- ($$$ "::" |-- !!! (typ -- opt_mixfix)) >> triple2;
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(* terms *)
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val trm = short_ident || long_ident || term_var || text_var || string;
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val term = group "term" trm;
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val prop = group "proposition" trm;
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(* arguments *)
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val keyword_symid = Scan.one (OuterLex.keyword_pred OuterLex.is_sid) >> OuterLex.val_of;
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fun atom_arg blk =
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  group "argument"
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    (position (short_ident || long_ident || sym_ident || term_var || text_var ||
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        type_ident || type_var || number) >> Args.ident ||
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      position keyword_symid >> Args.keyword ||
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      position string >> Args.string ||
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      position (if blk then $$$ "," else Scan.fail) >> Args.keyword);
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fun paren_args l r scan = position ($$$ l) -- !!! (scan true -- position ($$$ r))
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  >> (fn (x, (ys, z)) => Args.keyword x :: ys @ [Args.keyword z]);
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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 (atom_arg blk) ||
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      paren_args "(" ")" args ||
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      paren_args "{" "}" args ||
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      paren_args "[" "]" args)) >> flat) x;
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(* theorem names *)
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val attrib = position (xname -- !!! (args false)) >> Args.src;
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val attribs = $$$ "[" |-- !!! (list attrib --| $$$ "]");
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val opt_attribs = Scan.optional attribs [];
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val thm_name = name -- opt_attribs --| $$$ ":";
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val opt_thm_name = Scan.optional thm_name ("", []);
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(* proof methods *)
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fun meth4 x =
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 (position (xname >> rpair []) >> (Method.Source o Args.src) ||
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  $$$ "(" |-- meth0 --| $$$ ")") x
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and meth3 x =
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 (position (xname -- args1 false) >> (Method.Source o Args.src) ||
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  meth4) x
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and meth2 x =
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 (meth4 --| $$$ "?" >> Method.Try ||
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  meth4 --| $$$ "*" >> Method.Repeat ||
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  meth4 --| $$$ "+" >> Method.Repeat1 ||
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  meth3) x
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and meth1 x = (enum1 "," meth2 >> (fn [m] => m | ms => Method.Then ms)) x
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and meth0 x = (enum1 "|" meth1 >> (fn [m] => m | ms => Method.Orelse ms)) x;
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val method = meth2;
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end;