You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
36 lines
1.2 KiB
OCaml
36 lines
1.2 KiB
OCaml
let of_string x = Str.(split (regexp " *> *")) (String.trim x)
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let topic x =
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let path = of_string x in
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try List.nth path (List.length path - 1) with _ -> ""
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module Map = Map.Make(String)
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let edges x map = try Map.find x map with Not_found -> (String_set.empty, String_set.empty)
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let edges_with_context context (contexts, subtopics) = (String_set.add context contexts, subtopics)
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let edges_with_subtopic subtopic (contexts, subtopics) = (contexts, String_set.add subtopic subtopics)
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let rec list_to_map map = function
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| [] -> map
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| [topic] ->
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let edges = edges topic map in
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Map.add topic edges map
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| context :: topic :: tail ->
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let context_edges = edges context map in
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let topic_edges = edges topic map in
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let map =
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map
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|> Map.add context (edges_with_subtopic topic context_edges)
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|> Map.add topic (edges_with_context context topic_edges)
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in
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list_to_map map (topic :: tail)
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let to_map map set =
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List.fold_left (fun acc elt -> list_to_map acc (of_string elt)) map @@ String_set.elements set
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let roots map =
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let root_keys acc (key, (contexts, _topics)) = if String_set.is_empty contexts then key :: acc else acc in
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List.fold_left root_keys [] @@ Map.bindings map
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