80 lines
2.3 KiB
Plaintext
80 lines
2.3 KiB
Plaintext
/-
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Copyright (c) 2021 Henrik Böving. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Henrik Böving
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-/
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import Lean
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import Std.Data.HashMap
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namespace DocGen4
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open Lean Std Name
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def getNLevels (name : Name) (levels: Nat) : Name :=
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let components := name.components'
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(components.drop (components.length - levels)).reverse.foldl (· ++ ·) Name.anonymous
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inductive Hierarchy where
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| node (name : Name) (isFile : Bool) (children : RBNode Name (λ _ => Hierarchy)) : Hierarchy
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instance : Inhabited Hierarchy := ⟨Hierarchy.node Name.anonymous false RBNode.leaf⟩
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abbrev HierarchyMap := RBNode Name (λ _ => Hierarchy)
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-- Everything in this namespace is adapted from stdlib's RBNode
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namespace HierarchyMap
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def toList : HierarchyMap → List (Name × Hierarchy)
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| t => t.revFold (fun ps k v => (k, v)::ps) []
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def hForIn [Monad m] (t : HierarchyMap) (init : σ) (f : (Name × Hierarchy) → σ → m (ForInStep σ)) : m σ :=
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t.forIn init (fun a b acc => f (a, b) acc)
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instance : ForIn m HierarchyMap (Name × Hierarchy) where
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forIn := HierarchyMap.hForIn
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end HierarchyMap
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namespace Hierarchy
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def empty (n : Name) (isFile : Bool) : Hierarchy :=
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node n isFile RBNode.leaf
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def getName : Hierarchy → Name
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| node n _ _ => n
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def getChildren : Hierarchy → HierarchyMap
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| node _ _ c => c
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def isFile : Hierarchy → Bool
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| node _ f _ => f
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partial def insert! (h : Hierarchy) (n : Name) : Hierarchy := Id.run $ do
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let hn := h.getName
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let mut cs := h.getChildren
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if getNumParts hn + 1 == getNumParts n then
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match cs.find Name.cmp n with
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| none =>
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node hn h.isFile (cs.insert Name.cmp n $ empty n true)
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| some (node _ true _) => h
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| some hierarchy@(node _ false ccs) =>
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cs := cs.erase Name.cmp n
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node hn h.isFile (cs.insert Name.cmp n $ node n true ccs)
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else
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let leveledName := getNLevels n (getNumParts hn + 1)
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match cs.find Name.cmp leveledName with
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| some nextLevel =>
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cs := cs.erase Name.cmp leveledName
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-- BUG?
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node hn h.isFile $ cs.insert Name.cmp leveledName (nextLevel.insert! n)
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| none =>
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let child := (insert! (empty leveledName false) n)
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node hn h.isFile $ cs.insert Name.cmp leveledName child
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partial def fromArray (names : Array Name) : Hierarchy :=
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names.foldl insert! (empty anonymous false)
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end Hierarchy
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end DocGen4
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