author | wenzelm |
Sun, 01 Mar 2009 23:36:12 +0100 | |
changeset 30190 | 479806475f3c |
parent 29848 | a7c164e228e1 |
child 30213 | 3951aab916fd |
child 30240 | 5b25fee0362c |
permissions | -rw-r--r-- |
6118 | 1 |
(* Title: Pure/General/name_space.ML |
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Author: Markus Wenzel, TU Muenchen |
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Generic name spaces with declared and hidden entries. Unknown names |
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are considered global; no support for absolute addressing. |
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Cf. Pure/General/binding.ML |
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*) |
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type bstring = string; (*simple names to be bound -- legacy*) |
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type xstring = string; (*external names*) |
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signature NAME_SPACE = |
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sig |
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include BASIC_BINDING |
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val hidden: string -> string |
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val is_hidden: string -> bool |
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val separator: string (*single char*) |
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val is_qualified: string -> bool |
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val implode: string list -> string |
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val explode: string -> string list |
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val append: string -> string -> string |
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val qualified: string -> string -> string |
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val base: string -> string |
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val qualifier: string -> string |
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val map_base: (string -> string) -> string -> string |
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type T |
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val empty: T |
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val intern: T -> xstring -> string |
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val extern: T -> string -> xstring |
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val hide: bool -> string -> T -> T |
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val get_accesses: T -> string -> xstring list |
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val merge: T * T -> T |
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type naming |
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val default_naming: naming |
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val declare: naming -> binding -> T -> string * T |
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val full_name: naming -> binding -> string |
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val external_names: naming -> string -> string list |
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val path_of: naming -> string |
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val add_path: string -> naming -> naming |
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val no_base_names: naming -> naming |
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val qualified_names: naming -> naming |
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val sticky_prefix: string -> naming -> naming |
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type 'a table = T * 'a Symtab.table |
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val empty_table: 'a table |
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val bind: naming -> binding * 'a |
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-> 'a table -> string * 'a table (*exception Symtab.DUP*) |
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val merge_tables: ('a * 'a -> bool) -> 'a table * 'a table -> 'a table |
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val join_tables: (string -> 'a * 'a -> 'a) |
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-> 'a table * 'a table -> 'a table |
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val dest_table: 'a table -> (string * 'a) list |
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val extern_table: 'a table -> (xstring * 'a) list |
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end; |
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structure NameSpace: NAME_SPACE = |
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struct |
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open Basic_Binding; |
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(** long identifiers **) |
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fun hidden name = "??." ^ name; |
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val is_hidden = String.isPrefix "??."; |
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val separator = Binding.separator; |
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val is_qualified = Binding.is_qualified; |
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val implode_name = space_implode separator; |
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val explode_name = space_explode separator; |
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fun append name1 "" = name1 |
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| append "" name2 = name2 |
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| append name1 name2 = name1 ^ separator ^ name2; |
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fun qualified path name = |
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if path = "" orelse name = "" then name |
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else path ^ separator ^ name; |
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fun base "" = "" |
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| base name = List.last (explode_name name); |
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fun qualifier "" = "" |
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| qualifier name = implode_name (#1 (split_last (explode_name name))); |
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fun map_base _ "" = "" |
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| map_base f name = |
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let val names = explode_name name |
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in implode_name (nth_map (length names - 1) f names) end; |
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(* standard accesses *) |
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infixr 6 @@; |
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fun ([] @@ yss) = [] |
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| ((xs :: xss) @@ yss) = map (fn ys => xs @ ys) yss @ (xss @@ yss); |
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fun suffixes_prefixes list = |
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let |
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val (xs, ws) = chop (length list - 1) list; |
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val sfxs = suffixes xs @@ [ws]; |
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val pfxs = prefixes1 xs @@ [ws]; |
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in (sfxs @ pfxs, sfxs) end; |
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fun suffixes_prefixes_split i k list = |
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let |
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val (((xs, ys), zs), ws) = list |> chop i ||>> chop k ||>> chop (length list - (i + k + 1)); |
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val sfxs = |
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[ys] @@ suffixes zs @@ [ws] @ |
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suffixes1 xs @@ [ys @ zs @ ws]; |
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val pfxs = |
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prefixes1 xs @@ [ys @ ws] @ |
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[xs @ ys] @@ prefixes1 zs @@ [ws]; |
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in (sfxs @ pfxs, sfxs) end; |
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(** name spaces **) |
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(* datatype T *) |
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datatype T = |
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NameSpace of |
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((string list * string list) * stamp) Symtab.table * (*internals, hidden internals*) |
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(string list * stamp) Symtab.table; (*externals*) |
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val empty = NameSpace (Symtab.empty, Symtab.empty); |
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fun lookup (NameSpace (tab, _)) xname = |
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(case Symtab.lookup tab xname of |
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NONE => (xname, true) |
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| SOME (([], []), _) => (xname, true) |
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| SOME (([name], _), _) => (name, true) |
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| SOME ((name :: _, _), _) => (name, false) |
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| SOME (([], name' :: _), _) => (hidden name', true)); |
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fun ex_mapsto_in (NameSpace (tab, _)) name xname = |
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(case Symtab.lookup tab xname of |
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SOME ((name'::_, _), _) => name' = name |
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| _ => false); |
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fun get_accesses' valid_only (ns as (NameSpace (_, tab))) name = |
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(case Symtab.lookup tab name of |
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NONE => [name] |
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| SOME (xnames, _) => if valid_only |
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then filter (ex_mapsto_in ns name) xnames |
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else xnames); |
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val get_accesses = get_accesses' true; |
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fun put_accesses name xnames (NameSpace (tab, xtab)) = |
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NameSpace (tab, Symtab.update (name, (xnames, stamp ())) xtab); |
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fun valid_accesses (NameSpace (tab, _)) name = Symtab.fold (fn (xname, ((names, _), _)) => |
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if not (null names) andalso hd names = name then cons xname else I) tab []; |
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(* intern and extern *) |
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fun intern space xname = #1 (lookup space xname); |
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fun extern space name = |
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let |
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fun valid unique xname = |
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let val (name', uniq) = lookup space xname |
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in name = name' andalso (uniq orelse not unique) end; |
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fun ext [] = if valid false name then name else hidden name |
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| ext (nm :: nms) = if valid (! unique_names) nm then nm else ext nms; |
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in |
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if ! long_names then name |
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else if ! short_names then base name |
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else ext (get_accesses' false space name) |
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end; |
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(* basic operations *) |
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local |
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fun map_space f xname (NameSpace (tab, xtab)) = |
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NameSpace (Symtab.map_default (xname, (([], []), stamp ())) |
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(fn (entry, _) => (f entry, stamp ())) tab, xtab); |
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in |
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val del_name = map_space o apfst o remove (op =); |
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fun del_name_extra name = map_space (apfst (fn [] => [] | x :: xs => x :: remove (op =) name xs)); |
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val add_name = map_space o apfst o update (op =); |
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val add_name' = map_space o apsnd o update (op =); |
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end; |
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(* hide *) |
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fun hide fully name space = |
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if not (is_qualified name) then |
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error ("Attempt to hide global name " ^ quote name) |
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else if is_hidden name then |
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error ("Attempt to hide hidden name " ^ quote name) |
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else |
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let val names = valid_accesses space name in |
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space |
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|> add_name' name name |
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|> fold (del_name name) (if fully then names else names inter_string [base name]) |
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|> fold (del_name_extra name) (get_accesses' false space name) |
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end; |
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(* merge *) |
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fun merge (NameSpace (tab1, xtab1), NameSpace (tab2, xtab2)) = |
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let |
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val tab' = (tab1, tab2) |> Symtab.join |
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(K (fn (((names1, names1'), stamp1), ((names2, names2'), stamp2)) => |
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if stamp1 = stamp2 then raise Symtab.SAME |
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else |
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((Library.merge (op =) (names1, names2), |
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Library.merge (op =) (names1', names2')), stamp ()))); |
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val xtab' = (xtab1, xtab2) |> Symtab.join |
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(K (fn ((xnames1, stamp1), (xnames2, stamp2)) => |
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if stamp1 = stamp2 then raise Symtab.SAME |
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else (Library.merge (op =) (xnames1, xnames2), stamp ()))); |
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in NameSpace (tab', xtab') end; |
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(** naming contexts **) |
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(* datatype naming *) |
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datatype naming = Naming of |
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string * (*path*) |
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((string -> string -> string) * (*qualify*) |
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(string list -> string list list * string list list)); (*accesses*) |
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fun path_of (Naming (path, _)) = path; |
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fun accesses (Naming (_, (_, accs))) = accs; |
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fun external_names naming = map implode_name o #2 o accesses naming o explode_name; |
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(* manipulate namings *) |
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fun reject_qualified name = |
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if is_qualified name then |
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error ("Attempt to declare qualified name " ^ quote name) |
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else name; |
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val default_naming = |
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Naming ("", (fn path => qualified path o reject_qualified, suffixes_prefixes)); |
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fun add_path elems (Naming (path, policy)) = |
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if elems = "//" then Naming ("", (qualified, #2 policy)) |
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else if elems = "/" then Naming ("", policy) |
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else if elems = ".." then Naming (qualifier path, policy) |
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else Naming (append path elems, policy); |
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fun no_base_names (Naming (path, (qualify, accs))) = |
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Naming (path, (qualify, pairself (filter_out (fn [_] => true | _ => false)) o accs)); |
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fun qualified_names (Naming (path, (_, accs))) = Naming (path, (qualified, accs)); |
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fun sticky_prefix prfx (Naming (path, (qualify, _))) = |
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Naming (append path prfx, |
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(qualify, suffixes_prefixes_split (length (explode_name path)) (length (explode_name prfx)))); |
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val apply_prefix = |
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let |
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fun mk_prefix (prfx, true) = sticky_prefix prfx |
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| mk_prefix (prfx, false) = add_path prfx; |
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in fold mk_prefix end; |
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(* declarations *) |
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fun full_internal (Naming (path, (qualify, _))) = qualify path; |
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fun declare_internal naming name space = |
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if is_hidden name then |
281 |
error ("Attempt to declare hidden name " ^ quote name) |
|
282 |
else |
|
283 |
let |
|
284 |
val names = explode_name name; |
|
285 |
val _ = (null names orelse exists (fn s => s = "") names |
|
286 |
orelse exists_string (fn s => s = "\"") name) andalso |
|
287 |
error ("Bad name declaration " ^ quote name); |
|
288 |
val (accs, accs') = pairself (map implode_name) (accesses naming names); |
|
289 |
in space |> fold (add_name name) accs |> put_accesses name accs' end; |
|
290 |
||
28991 | 291 |
fun full_name naming b = |
292 |
let val (prefix, bname) = Binding.dest b |
|
293 |
in full_internal (apply_prefix prefix naming) bname end; |
|
294 |
||
28965 | 295 |
fun declare bnaming b = |
28860 | 296 |
let |
28965 | 297 |
val (prefix, bname) = Binding.dest b; |
28860 | 298 |
val naming = apply_prefix prefix bnaming; |
28991 | 299 |
val name = full_internal naming bname; |
300 |
in declare_internal naming name #> pair name end; |
|
28860 | 301 |
|
16137 | 302 |
|
16341
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
303 |
|
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
304 |
(** name spaces coupled with symbol tables **) |
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
305 |
|
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
306 |
type 'a table = T * 'a Symtab.table; |
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
307 |
|
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
308 |
val empty_table = (empty, Symtab.empty); |
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
309 |
|
28965 | 310 |
fun bind naming (b, x) (space, tab) = |
28860 | 311 |
let |
28965 | 312 |
val (name, space') = declare naming b space; |
313 |
in (name, (space', Symtab.update_new (name, x) tab)) end; |
|
28860 | 314 |
|
16341
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
315 |
fun merge_tables eq ((space1, tab1), (space2, tab2)) = |
19367 | 316 |
(merge (space1, space2), Symtab.merge eq (tab1, tab2)); |
16341
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
317 |
|
28991 | 318 |
fun join_tables f ((space1, tab1), (space2, tab2)) = |
319 |
(merge (space1, space2), Symtab.join f (tab1, tab2)); |
|
320 |
||
16848 | 321 |
fun ext_table (space, tab) = |
322 |
Symtab.fold (fn (name, x) => cons ((name, extern space name), x)) tab [] |
|
323 |
|> Library.sort_wrt (#2 o #1); |
|
324 |
||
325 |
fun dest_table tab = map (apfst #1) (ext_table tab); |
|
326 |
fun extern_table tab = map (apfst #2) (ext_table tab); |
|
16341
e573e5167eda
added type NameSpace.table with basic operations;
wenzelm
parents:
16262
diff
changeset
|
327 |
|
21858
05f57309170c
avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents:
20530
diff
changeset
|
328 |
|
05f57309170c
avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents:
20530
diff
changeset
|
329 |
(*final declarations of this structure!*) |
05f57309170c
avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents:
20530
diff
changeset
|
330 |
val implode = implode_name; |
05f57309170c
avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents:
20530
diff
changeset
|
331 |
val explode = explode_name; |
05f57309170c
avoid conflict with Alice keywords: renamed pack -> implode, unpack -> explode, any -> many, avoided assert;
wenzelm
parents:
20530
diff
changeset
|
332 |
|
5012 | 333 |
end; |