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type 'a vyconf_tree = {
name: string;
data: 'a;
children: 'a vyconf_tree list
}
exception Empty_path
exception Duplicate_child
exception Nonexistent_path
let make name data = { name = name; data = data; children = [] }
let rec find_child_in_list children name =
match children with
| [] -> None
| c :: cs -> if c.name = name then (Some c)
else find_child_in_list cs name
let rec remove_child_from_list children name =
match children with
| [] -> []
| c :: cs -> if c.name = name then cs
else c :: (remove_child_from_list cs name)
let rec replace_child_in_list children child =
match children with
| [] -> []
| c :: cs -> if c.name = child.name then child :: cs
else replace_child_in_list cs child
let extract_child children name =
find_child_in_list children name,
remove_child_from_list children name
let insert_immediate_child node name data =
let new_node = make name data in
let children' = node.children @ [new_node] in
{ node with children = children' }
let adopt_child node child =
{ node with children = (node.children @ [child]) }
let replace_child node child =
let children = node.children in
let children' = replace_child_in_list children child in
{ node with children = children' }
let find_child node name =
find_child_in_list node.children name
let rec insert_child default_data node path data =
match path with
| [] -> raise Empty_path
| [name] -> insert_immediate_child node name data
| name :: names ->
let next_child = find_child node name in
match next_child with
| Some next_child' ->
let new_node = insert_child default_data next_child' names data in
if names = [] then raise Duplicate_child
else replace_child node new_node
| None ->
let next_child' = make name default_data in
let new_node = insert_child default_data next_child' names data in
adopt_child node new_node
|
