author | wenzelm |
Wed, 17 Oct 2007 23:16:33 +0200 | |
changeset 25072 | 03f57b516e12 |
parent 24361 | 52a14669f9e9 |
child 25225 | e638164593bf |
permissions | -rw-r--r-- |
6118 | 1 |
(* Title: Pure/General/name_space.ML |
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ID: $Id$ |
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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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*) |
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type bstring = string; (*names to be bound / internalized*) |
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type xstring = string; (*externalized names / to be printed*) |
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signature BASIC_NAME_SPACE = |
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sig |
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val long_names: bool ref |
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val short_names: bool ref |
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val unique_names: bool ref |
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end; |
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signature NAME_SPACE = |
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sig |
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include BASIC_NAME_SPACE |
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val hidden: string -> string |
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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 merge: T * T -> T |
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type naming |
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val path_of: naming -> string |
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val external_names: naming -> string -> string list |
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val full: naming -> bstring -> string |
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val declare: naming -> string -> T -> T |
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val default_naming: naming |
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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 extend_table: naming -> (bstring * 'a) list -> 'a table -> 'a table |
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val merge_tables: ('a * 'a -> bool) -> '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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(** 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 = "."; |
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val is_qualified = exists_string (fn s => s = separator); |
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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 get_accesses (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, _) => xnames); |
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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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val long_names = ref false; |
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val short_names = ref false; |
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val unique_names = ref true; |
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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 ex [] = if valid false name then name else hidden name |
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| ex (nm :: nms) = if valid (! unique_names) nm then nm else ex 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 ex (get_accesses 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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fun del (name: string) = remove (op =) name; |
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fun add name names = name :: del name names; |
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||
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in |
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val del_name = map_space o apfst o del; |
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val add_name = map_space o apfst o add; |
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val add_name' = map_space o apsnd o add; |
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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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end; |
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(* merge *) |
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(* FIXME non-canonical merge order!? *) |
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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 =) (names2, names1), |
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Library.merge (op =) (names2', names1')), 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 =) (xnames2, xnames1), 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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(* declarations *) |
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fun full (Naming (path, (qualify, _))) = qualify path; |
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fun declare naming name space = |
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if is_hidden name then |
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error ("Attempt to declare hidden name " ^ quote name) |
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else |
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let |
248 |
val names = explode_name name; |
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val _ = (null names orelse exists (fn s => s = "") names |
250 |
orelse exists_string (fn s => s = "\"") name) andalso |
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error ("Bad name declaration " ^ quote name); |
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val (accs, accs') = pairself (map implode_name) (accesses naming names); |
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in space |> fold (add_name name) accs |> put_accesses name accs' end; |
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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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(** name spaces coupled with symbol tables **) |
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type 'a table = T * 'a Symtab.table; |
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val empty_table = (empty, Symtab.empty); |
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fun extend_table naming bentries (space, tab) = |
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let val entries = map (apfst (full naming)) bentries |
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in (fold (declare naming o #1) entries space, Symtab.extend (tab, entries)) end; |
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fun merge_tables eq ((space1, tab1), (space2, tab2)) = |
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(merge (space1, space2), Symtab.merge eq (tab1, tab2)); |
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fun ext_table (space, tab) = |
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Symtab.fold (fn (name, x) => cons ((name, extern space name), x)) tab [] |
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|> Library.sort_wrt (#2 o #1); |
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fun dest_table tab = map (apfst #1) (ext_table tab); |
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fun extern_table tab = map (apfst #2) (ext_table tab); |
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(*final declarations of this structure!*) |
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val implode = implode_name; |
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val explode = explode_name; |
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end; |
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structure BasicNameSpace: BASIC_NAME_SPACE = NameSpace; |
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open BasicNameSpace; |