(* Title: Pure/Syntax/symbol_font.ML
ID: $Id$
Author: Markus Wenzel, TU Muenchen
The Isabelle symbol font. Please keep enc_vector consistent with
lib/scripts/symbolinput.pl!
*)
signature SYMBOL_FONT =
sig
val char: string -> string option
val name: string -> string option
val read_charnames: string list -> string list
val read_chnames: string -> string
val write_charnames: string list -> string list (*normal backslashes*)
val write_chnames: string -> string
val write_charnames': string list -> string list (*escaped backslashes*)
val write_chnames': string -> string
end;
structure SymbolFont : SYMBOL_FONT =
struct
(** font encoding vector **)
(* tables *)
val enc_start = 161;
val enc_end = 255;
val enc_vector =
[
"Gamma", "Delta", "Theta", "Lambda", "Pi", "Sigma", "Phi",
"Psi", "Omega", "alpha", "beta", "gamma", "delta", "epsilon", "zeta",
"eta", "theta", "kappa", "lambda", "mu", "nu", "xi", "pi",
"rho", "sigma", "tau", "phi", "chi", "psi", "omega", "not",
"and", "or", "forall", "exists", "And", "lceil", "rceil", "lfloor",
"rfloor", "turnstile", "Turnstile", "lbrakk", "rbrakk", "cdot", "in", "subseteq",
"inter", "union", "Inter", "Union", "sqinter", "squnion", "Sqinter", "Squnion",
"bottom", "doteq", "equiv", "noteq", "sqsubset", "sqsubseteq", "prec", "preceq",
"succ", "approx", "sim", "simeq", "le", "Colon", "leftarrow", "midarrow",
"rightarrow", "Leftarrow", "Midarrow", "Rightarrow", "bow", "mapsto", "leadsto", "up",
"down", "notin", "times", "oplus", "ominus", "otimes", "oslash", "subset",
"infinity", "box", "diamond", "circ", "bullet", "parallel", "surd", "copyright"
];
val enc_rel = enc_vector ~~ (map chr (enc_start upto enc_end));
val enc_tab = Symtab.make enc_rel;
val dec_tab = Symtab.make (map swap enc_rel);
(* chars and names *)
fun char name = Symtab.lookup (enc_tab, name);
fun name char =
if ord char < enc_start then None
else Symtab.lookup (dec_tab, char);
(** input and output of symbols **)
(* read_charnames *)
local
open Scanner;
fun scan_symbol ("\\" :: "<" :: cs) =
let
val (name, cs') = (scan_id -- $$ ">" >> #1) cs handle LEXICAL_ERROR
=> error ("Malformed symbolic char specification: \"\\<" ^ implode cs ^ "\"");
val c = the (char name) handle OPTION _
=> error ("Unknown symbolic char name: " ^ quote name);
in (c, cs') end
| scan_symbol _ = raise LEXICAL_ERROR;
in
fun read_charnames chs =
if forall (not_equal "\\") chs then chs
else #1 (repeat (scan_symbol || scan_one (K true)) chs);
val read_chnames = implode o read_charnames o explode;
end;
(* write_charnames *)
fun write_char prfx ch =
(case name ch of
None => ch
| Some nm => prfx ^ "\\<" ^ nm ^ ">");
fun write_chars prfx chs =
if forall (fn ch => ord ch < enc_start) chs then chs
else map (write_char prfx) chs;
val write_charnames = write_chars "";
val write_charnames' = write_chars "\\";
val write_chnames = implode o write_charnames o explode;
val write_chnames' = implode o write_charnames' o explode;
end;