src/Pure/General/symbol.ML
author wenzelm
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(*  Title:      Pure/General/symbol.ML
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    ID:         $Id$
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    Author:     Markus Wenzel, TU Muenchen
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    License:    GPL (GNU GENERAL PUBLIC LICENSE)
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Generalized characters with infinitely many named symbols.
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*)
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signature SYMBOL =
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sig
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  type symbol
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  val space: symbol
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  val spaces: int -> symbol
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  val sync: symbol
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  val is_sync: symbol -> bool
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  val not_sync: symbol -> bool
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  val malformed: symbol
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  val eof: symbol
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  val is_eof: symbol -> bool
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  val not_eof: symbol -> bool
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  val stopper: symbol * (symbol -> bool)
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  val is_ascii: symbol -> bool
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  val is_letter: symbol -> bool
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  val is_digit: symbol -> bool
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  val is_quasi: symbol -> bool
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  val is_quasi_letter: symbol -> bool
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  val is_letdig: symbol -> bool
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  val is_blank: symbol -> bool
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  val is_symbolic: symbol -> bool
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  val is_printable: symbol -> bool
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  val length: symbol list -> int
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  val strip_blanks: string -> string
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  val beginning: symbol list -> string
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  val scan: string list -> symbol * string list
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  val scanner: string -> (symbol list -> 'a * symbol list) -> symbol list -> 'a
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  val source: bool -> (string, 'a) Source.source ->
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    (symbol, (string, 'a) Source.source) Source.source
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  val explode: string -> symbol list
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  val bump_string: string -> string
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  val default_indent: string * int -> string
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  val add_mode: string -> (string -> string * real) * (string * int -> string) -> unit
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  val symbolsN: string
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  val xsymbolsN: string
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  val plain_output: string -> string
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  val output: string -> string
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  val output_width: string -> string * real
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  val indent: string * int -> string
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end;
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structure Symbol: SYMBOL =
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struct
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(** generalized characters **)
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(*symbols, which are considered the smallest entities of any Isabelle
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  string, may be of the following form:
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    (a) ASCII symbols: a
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    (b) printable symbols: \<ident>
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    (c) control symbols: \<^ident>
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  output is subject to the print_mode variable (default: verbatim),
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  actual interpretation in display is up to front-end tools;
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*)
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type symbol = string;
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val space = " ";
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fun spaces k = Library.replicate_string k space;
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val sync = "\\<^sync>";
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val malformed = "\\<^malformed>";
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val eof = "";
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(* kinds *)
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fun is_sync s = s = sync;
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fun not_sync s = s <> sync;
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fun is_eof s = s = eof;
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fun not_eof s = s <> eof;
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val stopper = (eof, is_eof);
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fun is_ascii s = size s = 1 andalso ord s < 128;
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fun is_letter s =
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  size s = 1 andalso
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   (ord "A" <= ord s andalso ord s <= ord "Z" orelse
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    ord "a" <= ord s andalso ord s <= ord "z");
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fun is_digit s =
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  size s = 1 andalso ord "0" <= ord s andalso ord s <= ord "9";
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fun is_quasi "_" = true
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  | is_quasi "'" = true
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  | is_quasi _ = false;
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fun is_quasi_letter s = is_quasi s orelse is_letter s;
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val is_blank =
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  fn " " => true | "\t" => true | "\n" => true | "\^L" => true
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    | "\160" => true | "\\<spacespace>" => true
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    | _ => false;
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fun is_letdig s = is_quasi_letter s orelse is_digit s;
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fun is_symbolic s =
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  size s > 2 andalso nth_elem_string (2, s) <> "^";
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fun is_printable s =
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  size s = 1 andalso ord space <= ord s andalso ord s <= ord "~" orelse
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  is_symbolic s;
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fun sym_length ss = foldl (fn (n, s) =>
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  (if not (is_printable s) then 0 else
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    (case Library.try String.substring (s, 2, 4) of
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      Some s' => if s' = "long" orelse s' = "Long" then 2 else 1
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    | None => 1)) + n) (0, ss);
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fun strip_blanks s =
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  implode (#1 (Library.take_suffix is_blank (#2 (Library.take_prefix is_blank (explode s)))));
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(* beginning *)
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val smash_blanks = map (fn s => if is_blank s then space else s);
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fun beginning raw_ss =
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  let
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    val (all_ss, _) = take_suffix is_blank raw_ss;
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    val dots = if length all_ss > 10 then " ..." else "";
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    val (ss, _) = take_suffix is_blank (take (10, all_ss));
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  in implode (smash_blanks ss) ^ dots end;
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(** scanning through symbols **)
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fun scanner msg scan chs =
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  let
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    fun err_msg cs = msg ^ ": " ^ beginning cs;
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    val fin_scan = Scan.error (Scan.finite stopper (!! (fn (cs, _) => err_msg cs) scan));
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  in
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    (case fin_scan chs of
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      (result, []) => result
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    | (_, rest) => error (err_msg rest))
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  end;
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(** symbol input **)
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(* scan *)
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val scan_id = Scan.one is_letter ^^ (Scan.any is_letdig >> implode);
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val scan =
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  ($$ "\\" --| Scan.optional ($$ "\\") "") ^^ $$ "<" ^^
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    !! (fn (cs, _) => "Malformed symbolic character specification: \\" ^ "<" ^ beginning cs)
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      (Scan.optional ($$ "^") "" ^^ scan_id ^^ $$ ">") ||
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  Scan.one not_eof;
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(* source *)
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val recover = Scan.any ((not o is_blank) andf not_eof) >> K [malformed];
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fun source do_recover src =
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  Source.source stopper (Scan.bulk scan) (if do_recover then Some recover else None) src;
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(* explode *)
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fun no_syms [] = true
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  | no_syms ("\\" :: "<" :: _) = false
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  | no_syms (_ :: cs) = no_syms cs;
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fun sym_explode str =
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  let val chs = explode str in
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    if no_syms chs then chs     (*tune trivial case*)
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    else the (Scan.read stopper (Scan.repeat scan) chs)
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  end;
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(* bump_string -- increment suffix of lowercase letters like a base 26 number *)
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fun bump_string str =
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  let
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    fun bump [] = ["a"]
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      | bump ("z" :: ss) = "a" :: bump ss
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      | bump (s :: ss) =
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          if size s = 1 andalso ord "a" <= ord s andalso ord s < ord "z"
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          then chr (ord s + 1) :: ss
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          else "a" :: s :: ss;
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    val (cs, qs) = Library.take_suffix is_quasi (sym_explode str);
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  in implode (rev (bump (rev cs)) @ qs) end;
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(** symbol output **)
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(* default *)
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fun string_size s = (s, real (size s));
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fun default_output s =
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  if not (exists_string (equal "\\") s) then string_size s
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  else string_size (implode (map (fn "\\" => "\\\\" | c => c) (explode s)));    (*sic!*)
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fun default_indent (_: string, k) = spaces k;
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(* maintain modes *)
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val symbolsN = "symbols";
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val xsymbolsN = "xsymbols";
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val modes =
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  ref (Symtab.empty: ((string -> string * real) * (string * int -> string)) Symtab.table);
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fun lookup_mode name = Symtab.lookup (! modes, name);
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fun add_mode name m =
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 (if is_none (lookup_mode name) then ()
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  else warning ("Redeclaration of symbol print mode " ^ quote name);
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  modes := Symtab.update ((name, m), ! modes));
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fun get_mode () =
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  if_none (get_first lookup_mode (! print_mode)) (default_output, default_indent);
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(* mode output *)
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fun output_width x = #1 (get_mode ()) x;
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val output = #1 o output_width;
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val plain_output = #1 o default_output;
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fun indent x = #2 (get_mode ()) x;
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(*final declarations of this structure!*)
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val length = sym_length;
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val explode = sym_explode;
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end;