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(* Title: Pure/Thy/thy_header.ML
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ID: $Id$
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Author: Markus Wenzel, TU Muenchen
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Theory headers -- independent of outer syntax.
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*)
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signature THY_HEADER =
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sig
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val args: OuterLex.token list ->
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(string * string list * (string * bool) list) * OuterLex.token list
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val read: Position.T -> (string, 'a) Source.source -> string * string list * (string * bool) list
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end;
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structure ThyHeader: THY_HEADER =
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struct
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structure T = OuterLex;
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structure P = OuterParse;
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(* keywords *)
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val headerN = "header";
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val theoryN = "theory";
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val importsN = "imports";
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val usesN = "uses";
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val beginN = "begin";
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val header_lexicon = Scan.make_lexicon
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(map Symbol.explode ["%", "(", ")", ";", beginN, headerN, importsN, theoryN, usesN]);
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(* header args *)
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val file = (P.$$$ "(" |-- P.!!! (P.name --| P.$$$ ")")) >> rpair false || P.name >> rpair true;
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val uses = Scan.optional (P.$$$ usesN |-- P.!!! (Scan.repeat1 file)) [];
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val args =
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P.name -- (P.$$$ importsN |-- P.!!! (Scan.repeat1 P.name -- uses --| P.$$$ beginN))
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>> P.triple2;
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(* read header *)
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val header =
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(P.$$$ headerN -- P.tags) |-- (P.!!! (P.text -- Scan.repeat P.semicolon --
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(P.$$$ theoryN -- P.tags) |-- args)) ||
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(P.$$$ theoryN -- P.tags) |-- P.!!! args;
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fun read pos src =
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let val res =
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src
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|> Symbol.source false
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|> T.source NONE (fn () => (header_lexicon, Scan.empty_lexicon)) pos
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|> T.source_proper
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|> Source.source T.stopper (Scan.single (Scan.error header)) NONE
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|> Source.get_single;
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in
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(case res of SOME (x, _) => x
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| NONE => error ("Unexpected end of input" ^ Position.str_of pos))
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end;
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end;
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