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(.module:
[lux #*
[host (#+ import:)]
[data
["." product]
[number
["n" nat]]
[text
["%" format (#+ format)]]
[collection
["." row (#+ Row) ("#@." fold)]]]
[compiler
["_" host]]
[type
abstract]]
["." //])
(`` (for {(~~ (static _.old))
(as-is (import: java/lang/CharSequence)
(import: java/lang/Appendable
(append [java/lang/CharSequence] java/lang/Appendable))
(import: java/lang/String
(new [int])
(toString [] java/lang/String))
(import: java/lang/StringBuilder
(new [int])
(toString [] java/lang/String)))}))
(`` (abstract: #export Buffer
(for {(~~ (static _.old))
[Nat (-> java/lang/StringBuilder java/lang/StringBuilder)]}
## default
(Row Text))
{#.doc "Immutable text buffer for efficient text concatenation."}
(def: #export empty
Buffer
(:abstraction (for {(~~ (static _.old))
[0 id]}
## default
row.empty)))
(def: #export (append chunk buffer)
(-> Text Buffer Buffer)
(for {(~~ (static _.old))
(let [[capacity transform] (:representation buffer)
append! (: (-> Text java/lang/StringBuilder java/lang/StringBuilder)
(function (_ chunk builder)
(exec (java/lang/Appendable::append (:coerce java/lang/CharSequence chunk)
builder)
builder)))]
(:abstraction [(n.+ (//.size chunk) capacity)
(|>> transform (append! chunk))]))}
## default
(|> buffer :representation (row.add chunk) :abstraction)))
(def: #export (size buffer)
(-> Buffer Nat)
(for {(~~ (static _.old))
(|> buffer :representation product.left)}
## default
(row@fold (function (_ chunk total)
(n.+ (//.size chunk) total))
0
(:representation buffer))))
(def: #export (text buffer)
(-> Buffer Text)
(for {(~~ (static _.old))
(let [[capacity transform] (:representation buffer)]
(|> (java/lang/StringBuilder::new (.int capacity))
transform
java/lang/StringBuilder::toString))}
## default
(row@fold (function (_ chunk total)
(format total chunk))
""
(:representation buffer))))
))
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