author | haftmann |
Thu, 02 Sep 2010 13:58:16 +0200 | |
changeset 39056 | fa197571676b |
parent 39055 | 81e0368812ad |
child 39147 | 3c284a152bd6 |
permissions | -rw-r--r-- |
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(* Title: Tools/Code/code_namespace.ML |
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Author: Florian Haftmann, TU Muenchen |
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Mastering target language namespaces. |
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*) |
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signature CODE_NAMESPACE = |
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sig |
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val dest_name: string -> string * string |
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datatype ('a, 'b) node = |
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Dummy |
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| Stmt of 'a |
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| Module of ('b * (string * ('a, 'b) node) Graph.T); |
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val hierarchical_program: (string -> string) -> { module_alias: string -> string option, |
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reserved: Name.context, empty_nsp: 'c, namify_module: string -> 'c -> string * 'c, |
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namify_stmt: Code_Thingol.stmt -> string -> 'c -> string * 'c, |
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cyclic_modules: bool, empty_data: 'b, memorize_data: string -> 'b -> 'b, |
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modify_stmts: (string * Code_Thingol.stmt) list -> 'a option list } |
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-> Code_Thingol.program |
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-> { deresolver: string list -> string -> string, |
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hierarchical_program: (string * ('a, 'b) node) Graph.T } |
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end; |
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structure Code_Namespace : CODE_NAMESPACE = |
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struct |
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(** splitting names in module and base part **) |
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val dest_name = |
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apfst Long_Name.implode o split_last o fst o split_last o Long_Name.explode; |
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(** hierarchical program structure **) |
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datatype ('a, 'b) node = |
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Dummy |
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| Stmt of 'a |
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| Module of ('b * (string * ('a, 'b) node) Graph.T); |
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fun map_module_content f (Module content) = Module (f content); |
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fun map_module [] = I |
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| map_module (name_fragment :: name_fragments) = |
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apsnd o Graph.map_node name_fragment o apsnd o map_module_content |
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o map_module name_fragments; |
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fun hierarchical_program labelled_name { module_alias, reserved, empty_nsp, |
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namify_module, namify_stmt, cyclic_modules, empty_data, memorize_data, modify_stmts } program = |
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let |
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(* building module name hierarchy *) |
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fun alias_fragments name = case module_alias name |
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of SOME name' => Long_Name.explode name' |
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| NONE => map (fn name => fst (yield_singleton Name.variants name reserved)) |
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(Long_Name.explode name); |
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val module_names = Graph.fold (insert (op =) o fst o dest_name o fst) program []; |
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val fragments_tab = fold (fn name => Symtab.update |
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(name, alias_fragments name)) module_names Symtab.empty; |
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val dest_name = dest_name #>> (the o Symtab.lookup fragments_tab); |
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(* building empty module hierarchy *) |
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val empty_module = (empty_data, Graph.empty); |
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fun ensure_module name_fragment (data, nodes) = |
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if can (Graph.get_node nodes) name_fragment then (data, nodes) |
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else (data, |
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nodes |> Graph.new_node (name_fragment, (name_fragment, Module empty_module))); |
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fun allocate_module [] = I |
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| allocate_module (name_fragment :: name_fragments) = |
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ensure_module name_fragment |
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#> (apsnd o Graph.map_node name_fragment o apsnd o map_module_content o allocate_module) name_fragments; |
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val empty_program = Symtab.fold (fn (_, fragments) => allocate_module fragments) |
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fragments_tab empty_module; |
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(* distribute statements over hierarchy *) |
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fun add_stmt name stmt = |
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let |
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val (name_fragments, base) = dest_name name; |
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in |
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(map_module name_fragments o apsnd) (Graph.new_node (name, (base, Stmt stmt))) |
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end; |
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fun add_dependency name name' = |
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let |
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val (name_fragments, base) = dest_name name; |
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val (name_fragments', base') = dest_name name'; |
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val (name_fragments_common, (diff, diff')) = |
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chop_prefix (op =) (name_fragments, name_fragments'); |
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val is_module = not (null diff andalso null diff'); |
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val dep = pairself hd (diff @ [name], diff' @ [name']); |
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val add_edge = if is_module andalso not cyclic_modules |
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then (fn node => Graph.add_edge_acyclic dep node |
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handle Graph.CYCLES _ => error ("Dependency " |
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^ quote name ^ " -> " ^ quote name' |
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^ " would result in module dependency cycle")) |
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else Graph.add_edge dep |
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in (map_module name_fragments_common o apsnd) add_edge end; |
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val proto_program = empty_program |
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|> Graph.fold (fn (name, (stmt, _)) => add_stmt name stmt) program |
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|> Graph.fold (fn (name, (_, (_, names))) => fold (add_dependency name) names) program; |
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(* name declarations, data and statement modifications *) |
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fun make_declarations nsps (data, nodes) = |
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let |
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val (module_fragments, stmt_names) = List.partition |
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(fn name_fragment => case Graph.get_node nodes name_fragment |
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of (_, Module _) => true | _ => false) (Graph.keys nodes); |
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fun declare namify name (nsps, nodes) = |
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let |
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val (base, node) = Graph.get_node nodes name; |
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val (base', nsps') = namify node base nsps; |
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val nodes' = Graph.map_node name (K (base', node)) nodes; |
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in (nsps', nodes') end; |
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val (nsps', nodes') = (nsps, nodes) |
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|> fold (declare (K namify_module)) module_fragments |
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|> fold (declare (namify_stmt o (fn Stmt stmt => stmt))) stmt_names; |
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fun zip_fillup xs ys = xs ~~ ys @ replicate (length xs - length ys) NONE; |
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fun select_names names = case filter (member (op =) stmt_names) names |
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of [] => NONE |
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| xs => SOME xs; |
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val modify_stmts' = AList.make (snd o Graph.get_node nodes) |
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#> split_list |
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##> map (fn Stmt stmt => stmt) |
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#> (fn (names, stmts) => zip_fillup names (modify_stmts (names ~~ stmts))); |
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val stmtss' = (maps modify_stmts' o map_filter select_names o Graph.strong_conn) nodes; |
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val nodes'' = Graph.map (fn name => apsnd (fn Module content => Module (make_declarations nsps' content) |
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| _ => case AList.lookup (op =) stmtss' name of SOME (SOME stmt) => Stmt stmt | _ => Dummy)) nodes'; |
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val data' = fold memorize_data stmt_names data; |
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in (data', nodes'') end; |
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val (_, hierarchical_program) = make_declarations empty_nsp proto_program; |
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(* deresolving *) |
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fun deresolver prefix_fragments name = |
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let |
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val (name_fragments, _) = dest_name name; |
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val (_, (_, remainder)) = chop_prefix (op =) (prefix_fragments, name_fragments); |
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val nodes = fold (fn name_fragment => fn nodes => case Graph.get_node nodes name_fragment |
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of (_, Module (_, nodes)) => nodes) name_fragments hierarchical_program; |
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val (base', _) = Graph.get_node nodes name; |
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in Long_Name.implode (remainder @ [base']) end |
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handle Graph.UNDEF _ => error ("Unknown statement name: " ^ labelled_name name); |
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in { deresolver = deresolver, hierarchical_program = hierarchical_program } end; |
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end; |