author | wenzelm |
Sat, 02 Apr 2016 21:10:07 +0200 | |
changeset 62819 | d3ff367a16a0 |
parent 62663 | bea354f6ff21 |
child 63003 | bf5fcc65586b |
permissions | -rw-r--r-- |
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(* Title: Pure/General/binding.ML |
2 |
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 scope |
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val new_scope: unit -> scope |
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eqtype binding |
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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 reset_pos: 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 restricted: (bool * scope) option -> binding -> binding |
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val concealed: binding -> binding |
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val pretty: binding -> Pretty.T |
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val print: binding -> string |
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val bad: binding -> string |
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val check: binding -> unit |
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val name_spec: scope list -> (string * bool) list -> binding -> |
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{restriction: bool option, concealed: bool, spec: (string * bool) list} |
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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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(* scope of restricted entries *) |
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datatype scope = Scope of serial; |
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fun new_scope () = Scope (serial ()); |
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(* binding *) |
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datatype binding = Binding of |
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{restricted: (bool * scope) option, (*entry is private (true) or qualified (false) wrt. scope*) |
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concealed: 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 (restricted, concealed, prefix, qualifier, name, pos) = |
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Binding {restricted = restricted, concealed = concealed, prefix = prefix, |
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qualifier = qualifier, name = name, pos = pos}; |
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fun map_binding f (Binding {restricted, concealed, prefix, qualifier, name, pos}) = |
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make_binding (f (restricted, concealed, prefix, qualifier, name, pos)); |
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fun path_of (Binding {prefix, qualifier, ...}) = prefix @ qualifier; |
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(** basic operations **) |
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(* name and position *) |
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fun make (name, pos) = make_binding (NONE, 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 (restricted, concealed, prefix, qualifier, name, _) => |
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(restricted, concealed, prefix, qualifier, name, pos)); |
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val reset_pos = set_pos Position.none; |
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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 (restricted, concealed, prefix, qualifier, name, pos) => |
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(restricted, concealed, 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 (restricted, concealed, prefix, qualifier, name, pos) => |
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(restricted, concealed, prefix, (qual, mandatory) :: qualifier, name, pos)); |
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fun qualified mandatory name' = |
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map_binding (fn (restricted, concealed, prefix, qualifier, name, pos) => |
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let val qualifier' = if name = "" then qualifier else qualifier @ [(name, mandatory)] |
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in (restricted, concealed, 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 (NONE, 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 (restricted, concealed, prefix, qualifier, name, pos) => |
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(restricted, concealed, 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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fun restricted default = |
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map_binding (fn (restricted, concealed, prefix, qualifier, name, pos) => |
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(if is_some restricted then restricted else default, concealed, prefix, qualifier, name, pos)); |
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val concealed = |
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map_binding (fn (restricted, _, prefix, qualifier, name, pos) => |
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(restricted, 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.unformatted_string_of o pretty; |
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careful export of type-dependent functions, without losing their special status;
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val _ = ML_system_pp (fn _ => fn _ => Pretty.to_polyml o pretty o set_pos Position.none); |
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(* check *) |
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161 |
|
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fun bad binding = "Bad name binding: " ^ print binding ^ Position.here (pos_of binding); |
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163 |
|
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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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|
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||
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(** resulting name_spec **) |
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val bad_specs = ["", "??", "__"]; |
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||
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fun name_spec scopes path binding = |
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let |
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val Binding {restricted, concealed, prefix, qualifier, name, ...} = binding; |
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val _ = Long_Name.is_qualified name andalso error (bad binding); |
178 |
||
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val restriction = |
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(case restricted of |
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NONE => NONE |
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| SOME (strict, scope) => if member (op =) scopes scope then NONE else SOME strict); |
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|
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val spec1 = |
185 |
maps (fn (a, b) => map (rpair b) (Long_Name.explode a)) (path @ prefix @ qualifier); |
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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, _) => member (op =) bad_specs a orelse exists_string (fn s => s = "\"") a) spec |
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andalso error (bad binding); |
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in {restriction = restriction, concealed = concealed, spec = if null spec2 then [] else spec} end; |
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|
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|
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end; |
195 |
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type binding = Binding.binding; |