author | wenzelm |
Sat, 14 Mar 2009 00:13:50 +0100 | |
changeset 30522 | e26b80647189 |
parent 30469 | de9e8f1d927c |
child 32738 | 15bb09ca0378 |
permissions | -rw-r--r-- |
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(* 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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*) |
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type xstring = string; (*external names*) |
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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 is_hidden: string -> bool |
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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 extern_flags: {long_names: bool, short_names: bool, unique_names: bool} -> |
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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 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 add_path: string -> naming -> naming |
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val root_path: naming -> naming |
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val parent_path: naming -> naming |
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val mandatory_path: string -> naming -> naming |
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type 'a table = T * 'a Symtab.table |
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val define: naming -> binding * 'a -> 'a table -> string * 'a table (*exception Symtab.DUP*) |
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val empty_table: 'a table |
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val merge_tables: ('a * 'a -> bool) -> 'a table * 'a table -> 'a table (*exception Symtab.DUP*) |
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val join_tables: (string -> 'a * 'a -> 'a) (*exception Symtab.DUP/Symtab.SAME*) -> |
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'a table * 'a table -> 'a table (*exception Symtab.DUP*) |
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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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(** name spaces **) |
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(* hidden entries *) |
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fun hidden name = "??." ^ name; |
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val is_hidden = String.isPrefix "??."; |
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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) Symtab.table * (*internals, hidden internals*) |
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xstring list 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 (_, xtab)) name = |
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(case Symtab.lookup xtab 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) 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_flags {long_names, short_names, unique_names} space name = |
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let |
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fun valid require_unique xname = |
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let val (name', is_unique) = lookup space xname |
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in name = name' andalso (not require_unique orelse is_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 Long_Name.base_name name |
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else ext (get_accesses space name) |
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end; |
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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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extern_flags |
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{long_names = ! long_names, |
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short_names = ! short_names, |
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unique_names = ! unique_names} space name; |
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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, ([], [])) f 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 (Long_Name.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) |
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(if fully then names else names inter_string [Long_Name.base_name name]) |
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|> fold (del_name_extra name) (get_accesses 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'), (names2, names2')) => |
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if pointer_eq (names1, names2) andalso pointer_eq (names1', names2') then raise Symtab.SAME |
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else (Library.merge (op =) (names1, names2), Library.merge (op =) (names1', names2')))); |
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val xtab' = (xtab1, xtab2) |> Symtab.join |
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(K (fn xnames => |
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if pointer_eq xnames then raise Symtab.SAME |
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else (Library.merge (op =) xnames))); |
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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 (string * bool) list; |
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fun map_naming f (Naming path) = Naming (f path); |
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val default_naming = Naming []; |
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fun add_path elems = map_naming (fn path => path @ [(elems, false)]); |
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val root_path = map_naming (fn _ => []); |
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val parent_path = map_naming (perhaps (try (#1 o split_last))); |
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fun mandatory_path elems = map_naming (fn path => path @ [(elems, true)]); |
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(* full name *) |
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fun err_bad binding = error ("Bad name binding " ^ quote (Binding.str_of binding)); |
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fun name_spec (Naming path) binding = |
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let |
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val (prefix, name) = Binding.dest binding; |
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val _ = Long_Name.is_qualified name andalso err_bad binding; |
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|
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val spec1 = maps (fn (a, b) => map (rpair b) (Long_Name.explode a)) (path @ prefix); |
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val spec2 = if name = "" then [] else [(name, true)]; |
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val spec = spec1 @ spec2; |
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val _ = |
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exists (fn (a, _) => a = "" orelse a = "??" orelse exists_string (fn s => s = "\"") a) spec |
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andalso err_bad binding; |
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in if null spec2 then [] else spec end; |
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|
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fun full naming = name_spec naming #> map fst; |
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fun full_name naming = full naming #> Long_Name.implode; |
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|
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|
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(* accesses *) |
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|
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fun mandatory xs = map_filter (fn (x, true) => SOME x | _ => NONE) xs; |
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|
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fun mandatory_prefixes xs = mandatory xs :: mandatory_prefixes1 xs |
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and mandatory_prefixes1 [] = [] |
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| mandatory_prefixes1 ((x, true) :: xs) = map (cons x) (mandatory_prefixes1 xs) |
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| mandatory_prefixes1 ((x, false) :: xs) = map (cons x) (mandatory_prefixes xs); |
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|
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fun mandatory_suffixes xs = map rev (mandatory_prefixes (rev xs)); |
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|
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fun accesses naming binding = |
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let |
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val spec = name_spec naming binding; |
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val sfxs = mandatory_suffixes spec; |
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val pfxs = mandatory_prefixes spec; |
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in pairself (map Long_Name.implode) (sfxs @ pfxs, sfxs) end; |
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|
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fun external_names naming = #2 o accesses naming o Binding.qualified_name; |
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|
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|
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(* declaration *) |
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|
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fun declare naming binding space = |
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let |
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val names = full naming binding; |
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val name = Long_Name.implode names; |
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val _ = name = "" andalso err_bad binding; |
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val (accs, accs') = accesses naming binding; |
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val space' = space |> fold (add_name name) accs |> put_accesses name accs'; |
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in (name, space') end; |
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16137 | 237 |
|
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(** name spaces coupled with symbol tables **) |
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|
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type 'a table = T * 'a Symtab.table; |
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|
30465 | 243 |
fun define naming (binding, x) (space, tab) = |
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let val (name, space') = declare naming binding space |
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in (name, (space', Symtab.update_new (name, x) tab)) end; |
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|
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val empty_table = (empty, Symtab.empty); |
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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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|
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fun join_tables f ((space1, tab1), (space2, tab2)) = |
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(merge (space1, space2), Symtab.join f (tab1, tab2)); |
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||
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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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|
5012 | 262 |
end; |
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|
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structure BasicNameSpace: BASIC_NAME_SPACE = NameSpace; |
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open BasicNameSpace; |
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