------------------------------------------------------------------------
-- The Agda standard library
--
-- 1 dimensional pretty printing of rose trees
------------------------------------------------------------------------
{-# OPTIONS --cubical-compatible --sized-types #-}
module Data.Tree.Rose.Show where
open import Level using (Level)
open import Size
open import Data.Bool.Base using (Bool; true; false; if_then_else_; _∧_)
open import Data.DifferenceList as DList renaming (DiffList to DList) using ()
open import Data.List.Base as List using (List; []; [_]; _∷_; _∷ʳ_)
open import Data.Nat.Base using (ℕ; _∸_)
open import Data.Product.Base using (_×_; _,_)
open import Data.String.Base using (String; _++_)
open import Data.Tree.Rose using (Rose; node; map; fromBinary)
open import Function.Base using (flip; _∘′_; id)
private
variable
a : Level
A : Set a
i : Size
display : Rose (List String) i → List String
display t = DList.toList (go (([] , t) ∷ []))
where
padding : Bool → List Bool → String → String
padding dir? [] str = str
padding dir? (b ∷ bs) str =
(if dir? ∧ List.null bs
then if b then " ├ " else " └ "
else if b then " │ " else " ")
++ padding dir? bs str
nodePrefixes : List A → List Bool
nodePrefixes as = true ∷ List.replicate (List.length as ∸ 1) false
childrenPrefixes : List A → List Bool
childrenPrefixes as = List.replicate (List.length as ∸ 1) true ∷ʳ false
go : List (List Bool × Rose (List String) i) → DList String
go [] = DList.[]
go ((bs , node a ts₁) ∷ ts) =
let bs′ = List.reverse bs in
DList.fromList (List.zipWith (flip padding bs′) (nodePrefixes a) a)
DList.++ go (List.zip (List.map (_∷ bs) (childrenPrefixes ts₁)) ts₁)
DList.++ go ts
show : (A → List String) → Rose A i → List String
show toString = display ∘′ map toString
showSimple : (A → String) → Rose A i → List String
showSimple toString = show ([_] ∘′ toString)
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