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