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(.module:
[lux #*
[host (#+ import:)]
["@" target]
[control
["." function]]
[data
["." product]
[text
["%" format (#+ format)]]
[collection
["." row (#+ Row) ("#\." fold)]]]
[math
[number
["n" nat]]]
[type
abstract]]
["." //])
(with_expansions [<jvm> (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)]))]
(`` (for {@.old (as_is <jvm>)
@.jvm (as_is <jvm>)}
(as_is))))
(`` (abstract: #export Buffer
(for {@.old [Nat (-> java/lang/StringBuilder java/lang/StringBuilder)]
@.jvm [Nat (-> java/lang/StringBuilder java/lang/StringBuilder)]}
## default
(Row Text))
{#.doc "Immutable text buffer for efficient text concatenation."}
(def: #export empty
Buffer
(:abstraction (with_expansions [<jvm> [0 function.identity]]
(for {@.old <jvm>
@.jvm <jvm>}
## default
row.empty))))
(def: #export (append chunk buffer)
(-> Text Buffer Buffer)
(with_expansions [<jvm> (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))]))]
(for {@.old <jvm>
@.jvm <jvm>}
## default
(|> buffer :representation (row.add chunk) :abstraction))))
(def: #export size
(-> Buffer Nat)
(with_expansions [<jvm> (|>> :representation product.left)]
(for {@.old <jvm>
@.jvm <jvm>}
## default
(|>> :representation
(row\fold (function (_ chunk total)
(n.+ (//.size chunk) total))
0)))))
(def: #export (text buffer)
(-> Buffer Text)
(with_expansions [<jvm> (let [[capacity transform] (:representation buffer)]
(|> (java/lang/StringBuilder::new (.int capacity))
transform
java/lang/StringBuilder::toString))]
(for {@.old <jvm>
@.jvm <jvm>}
## default
(row\fold (function (_ chunk total)
(format total chunk))
""
(:representation buffer)))))
))
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