author | wenzelm |
Tue, 05 Aug 2008 19:29:08 +0200 | |
changeset 27746 | c7aa4c18739d |
parent 27342 | 3945da15d410 |
child 27750 | 7f5fb39c6362 |
permissions | -rw-r--r-- |
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(* Title: Pure/Isar/antiquote.ML |
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ID: $Id$ |
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Text with antiquotations of inner items (terms, types etc.).
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Author: Markus Wenzel, TU Muenchen |
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Text with antiquotations of inner items (terms, types etc.). |
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*) |
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signature ANTIQUOTE = |
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sig |
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datatype antiquote = |
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Text of string | Antiq of string * Position.T | |
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Open of Position.T | Close of Position.T |
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val is_antiq: antiquote -> bool |
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val scan_antiquotes: string * Position.T -> antiquote list |
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val scan_arguments: Scan.lexicon -> (OuterLex.token list -> 'a * OuterLex.token list) -> |
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string * Position.T -> 'a |
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end; |
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structure Antiquote: ANTIQUOTE = |
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struct |
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(* datatype antiquote *) |
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datatype antiquote = |
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Text of string | |
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Antiq of string * Position.T | |
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Open of Position.T | |
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Close of Position.T; |
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fun is_antiq (Text _) = false |
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| is_antiq _ = true; |
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(* check_nesting *) |
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fun err_unbalanced pos = |
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error ("Unbalanced antiquotation block parentheses" ^ Position.str_of pos); |
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fun check_nesting antiqs = |
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let |
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fun check [] [] = () |
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| check [] (pos :: _) = err_unbalanced pos |
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| check (Open pos :: ants) ps = check ants (pos :: ps) |
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| check (Close pos :: _) [] = err_unbalanced pos |
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| check (Close _ :: ants) (_ :: ps) = check ants ps |
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| check (_ :: ants) ps = check ants ps; |
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in check antiqs [] end; |
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(* scan_antiquote *) |
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structure T = OuterLex; |
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local |
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fun count scan = Scan.depend (fn pos => scan >> (fn x => (Position.advance [x] pos, x))); |
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val scan_txt = |
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count ($$ "@" --| Scan.ahead (~$$ "{")) || |
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count (Scan.one (fn s => |
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s <> "@" andalso s <> "\\<lbrace>" andalso s <> "\\<rbrace>" andalso Symbol.is_regular s)); |
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fun escape "\\" = "\\\\" |
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| escape "\"" = "\\\"" |
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| escape s = s; |
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val quote_escape = Library.quote o implode o map escape o T.clean_value; |
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val scan_ant = |
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T.scan_string >> quote_escape || |
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count (Scan.one (fn s => s <> "}" andalso Symbol.is_regular s)); |
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val scan_antiq = |
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count ($$ "@") |-- count ($$ "{") |-- |
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T.!!! "missing closing brace of antiquotation" |
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(Scan.repeat scan_ant >> implode) --| count ($$ "}"); |
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in |
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fun scan_antiquote (pos, ss) = (pos, ss) |> |
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(Scan.repeat1 scan_txt >> (Text o implode) || |
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scan_antiq >> (fn s => Antiq (s, pos)) || |
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count ($$ "\\<lbrace>") >> K (Open pos) || |
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count ($$ "\\<rbrace>") >> K (Close pos)); |
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end; |
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(* scan_antiquotes *) |
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fun scan_antiquotes (s, pos) = |
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(case Scan.error (Scan.finite' Symbol.stopper (Scan.repeat scan_antiquote)) |
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(pos, Symbol.explode s) of |
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(xs, (_, [])) => (check_nesting xs; xs) |
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| (_, (pos', ss)) => error ("Malformed quotation/antiquotation source at: " ^ |
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quote (Symbol.beginning 10 ss) ^ Position.str_of pos')); |
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(* scan_arguments *) |
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fun scan_arguments lex antiq (s, pos) = |
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let |
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fun err msg = cat_error msg |
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("Malformed antiquotation: " ^ quote ("@{" ^ s ^ "}") ^ Position.str_of pos); |
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val res = |
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Source.of_string s |
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|> Symbol.source false |
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|> T.source NONE (K (lex, Scan.empty_lexicon)) pos |
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|> T.source_proper |
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|> Source.source T.stopper (Scan.error (Scan.bulk antiq)) NONE |
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|> Source.exhaust; |
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in (case res of [x] => x | _ => err "") handle ERROR msg => err msg end; |
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end; |