author | wenzelm |
Mon, 30 Mar 2015 22:34:59 +0200 | |
changeset 59858 | 890b68e1e8b6 |
parent 58032 | e92cdae8b3b5 |
child 59859 | f9d1442c70f3 |
permissions | -rw-r--r-- |
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(* Title: Pure/General/binding.ML |
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Author: Florian Haftmann, TU Muenchen |
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Author: Makarius |
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Structured name bindings. |
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*) |
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type bstring = string; (*primitive names to be bound*) |
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signature BINDING = |
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sig |
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eqtype binding |
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val dest: binding -> {private: bool, conceal: bool, path: (string * bool) list, name: bstring} |
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val path_of: binding -> (string * bool) list |
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val make: bstring * Position.T -> binding |
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val pos_of: binding -> Position.T |
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val set_pos: Position.T -> binding -> binding |
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val name: bstring -> binding |
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val name_of: binding -> bstring |
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val map_name: (bstring -> bstring) -> binding -> binding |
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val prefix_name: string -> binding -> binding |
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val suffix_name: string -> binding -> binding |
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val eq_name: binding * binding -> bool |
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val empty: binding |
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val is_empty: binding -> bool |
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val qualify: bool -> string -> binding -> binding |
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val qualified: bool -> string -> binding -> binding |
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val qualified_name: string -> binding |
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val prefix_of: binding -> (string * bool) list |
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val map_prefix: ((string * bool) list -> (string * bool) list) -> binding -> binding |
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val prefix: bool -> string -> binding -> binding |
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val private: binding -> binding |
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val conceal: binding -> binding |
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val pretty: binding -> Pretty.T |
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val print: binding -> string |
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val pp: binding -> Pretty.T |
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val bad: binding -> string |
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val check: binding -> unit |
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end; |
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structure Binding: BINDING = |
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struct |
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(** representation **) |
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(* datatype *) |
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datatype binding = Binding of |
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{private: bool, (*entry is strictly private -- no name space accesses*) |
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conceal: bool, (*entry is for foundational purposes -- please ignore*) |
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prefix: (string * bool) list, (*system prefix*) |
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qualifier: (string * bool) list, (*user qualifier*) |
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name: bstring, (*base name*) |
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pos: Position.T}; (*source position*) |
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fun make_binding (private, conceal, prefix, qualifier, name, pos) = |
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Binding {private = private, conceal = conceal, prefix = prefix, |
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qualifier = qualifier, name = name, pos = pos}; |
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fun map_binding f (Binding {private, conceal, prefix, qualifier, name, pos}) = |
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make_binding (f (private, conceal, prefix, qualifier, name, pos)); |
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fun dest (Binding {private, conceal, prefix, qualifier, name, ...}) = |
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{private = private, conceal = conceal, path = prefix @ qualifier, name = name}; |
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val path_of = #path o dest; |
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renamed Binding.display to Binding.str_of, which is slightly more canonical;
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moved type bstring from name_space.ML to binding.ML -- it is the primitive concept behind bindings;
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(** basic operations **) |
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(* name and position *) |
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fun make (name, pos) = make_binding (false, false, [], [], name, pos); |
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fun pos_of (Binding {pos, ...}) = pos; |
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fun set_pos pos = |
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map_binding (fn (private, conceal, prefix, qualifier, name, _) => |
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(private, conceal, prefix, qualifier, name, pos)); |
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fun name name = make (name, Position.none); |
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fun name_of (Binding {name, ...}) = name; |
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fun eq_name (b, b') = name_of b = name_of b'; |
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fun map_name f = |
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map_binding (fn (private, conceal, prefix, qualifier, name, pos) => |
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(private, conceal, prefix, qualifier, f name, pos)); |
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val prefix_name = map_name o prefix; |
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val suffix_name = map_name o suffix; |
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val empty = name ""; |
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fun is_empty b = name_of b = ""; |
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(* user qualifier *) |
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fun qualify _ "" = I |
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| qualify mandatory qual = |
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map_binding (fn (private, conceal, prefix, qualifier, name, pos) => |
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(private, conceal, prefix, (qual, mandatory) :: qualifier, name, pos)); |
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fun qualified mandatory name' = |
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map_binding (fn (private, conceal, prefix, qualifier, name, pos) => |
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let val qualifier' = if name = "" then qualifier else qualifier @ [(name, mandatory)] |
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in (private, conceal, prefix, qualifier', name', pos) end); |
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fun qualified_name "" = empty |
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| qualified_name s = |
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let val (qualifier, name) = split_last (Long_Name.explode s) |
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in make_binding (false, false, [], map (rpair false) qualifier, name, Position.none) end; |
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(* system prefix *) |
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fun prefix_of (Binding {prefix, ...}) = prefix; |
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fun map_prefix f = |
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map_binding (fn (private, conceal, prefix, qualifier, name, pos) => |
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(private, conceal, f prefix, qualifier, name, pos)); |
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fun prefix _ "" = I |
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| prefix mandatory prfx = map_prefix (cons (prfx, mandatory)); |
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(* visibility flags *) |
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val private = |
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map_binding (fn (_, conceal, prefix, qualifier, name, pos) => |
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(true, conceal, prefix, qualifier, name, pos)); |
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val conceal = |
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map_binding (fn (private, _, prefix, qualifier, name, pos) => |
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(private, true, prefix, qualifier, name, pos)); |
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(* print *) |
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fun pretty (Binding {prefix, qualifier, name, pos, ...}) = |
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if name = "" then Pretty.str "\"\"" |
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else |
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Pretty.markup (Position.markup pos Markup.binding) |
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[Pretty.str (Long_Name.implode (map #1 (prefix @ qualifier) @ [name]))] |
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|> Pretty.quote; |
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val print = Pretty.str_of o pretty; |
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val pp = pretty o set_pos Position.none; |
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(* check *) |
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fun bad binding = "Bad name binding: " ^ print binding ^ Position.here (pos_of binding); |
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fun check binding = |
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if Symbol_Pos.is_identifier (name_of binding) then () |
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else legacy_feature (bad binding); |
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end; |
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type binding = Binding.binding; |