author | wenzelm |
Tue, 14 Oct 2008 20:10:45 +0200 | |
changeset 28596 | fcd463a6b6de |
parent 24712 | 64ed05609568 |
child 29317 | 9faf1dfb4e7c |
permissions | -rw-r--r-- |
21759 | 1 |
(* Title: HOL/Tools/string_syntax.ML |
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ID: $Id$ |
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Author: Makarius |
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Concrete syntax for hex chars and strings. |
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*) |
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signature STRING_SYNTAX = |
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sig |
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val setup: theory -> theory |
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end; |
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structure StringSyntax: STRING_SYNTAX = |
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struct |
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(* nibble *) |
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val mk_nib = |
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Syntax.Constant o unprefix "List.nibble." o |
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fst o Term.dest_Const o HOLogic.mk_nibble; |
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fun dest_nib (Syntax.Constant c) = |
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HOLogic.dest_nibble (Const ("List.nibble." ^ c, dummyT)) |
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handle TERM _ => raise Match; |
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(* char *) |
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fun mk_char s = |
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if Symbol.is_ascii s then |
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Syntax.Appl [Syntax.Constant "Char", mk_nib (ord s div 16), mk_nib (ord s mod 16)] |
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else error ("Non-ASCII symbol: " ^ quote s); |
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val specials = explode "\\\"`'"; |
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fun dest_chr c1 c2 = |
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let val c = chr (dest_nib c1 * 16 + dest_nib c2) in |
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if not (member (op =) specials c) andalso Symbol.is_ascii c andalso Symbol.is_printable c |
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then c else raise Match |
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end; |
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fun dest_char (Syntax.Appl [Syntax.Constant "Char", c1, c2]) = dest_chr c1 c2 |
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| dest_char _ = raise Match; |
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fun syntax_xstr cs = |
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Syntax.Appl [Syntax.Constant "_xstr", Syntax.Variable (Syntax.implode_xstr cs)]; |
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fun char_ast_tr [Syntax.Variable xstr] = |
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(case Syntax.explode_xstr xstr of |
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[c] => mk_char c |
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| _ => error ("Single character expected: " ^ xstr)) |
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| char_ast_tr asts = raise AST ("char_ast_tr", asts); |
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fun char_ast_tr' [c1, c2] = Syntax.Appl [Syntax.Constant "_Char", syntax_xstr [dest_chr c1 c2]] |
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| char_ast_tr' _ = raise Match; |
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(* string *) |
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fun mk_string [] = Syntax.Constant "Nil" |
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| mk_string (c :: cs) = Syntax.Appl [Syntax.Constant "Cons", mk_char c, mk_string cs]; |
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fun string_ast_tr [Syntax.Variable xstr] = |
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(case Syntax.explode_xstr xstr of |
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[] => Syntax.Appl |
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[Syntax.Constant Syntax.constrainC, Syntax.Constant "Nil", Syntax.Constant "string"] |
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| cs => mk_string cs) |
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| string_ast_tr asts = raise AST ("string_tr", asts); |
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fun list_ast_tr' [args] = Syntax.Appl [Syntax.Constant "_String", |
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syntax_xstr (map dest_char (Syntax.unfold_ast "_args" args))] |
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| list_ast_tr' ts = raise Match; |
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(* theory setup *) |
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val setup = |
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24712
64ed05609568
proper Sign operations instead of Theory aliases;
wenzelm
parents:
21775
diff
changeset
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Sign.add_trfuns |
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([("_Char", char_ast_tr), ("_String", string_ast_tr)], [], [], |
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[("Char", char_ast_tr'), ("@list", list_ast_tr')]); |
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end; |