blob: f8042abc0be712e16280d5becd7d764b04b6782e (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
(.module:
[lux #*
[data
["." product]
[text
format]
[collection
["." row (#+ Row) ("row/." Fold<Row>)]]]
[compiler
["_" host]]
[type
abstract]
[host (#+ import:)]]
["." //])
(`` (for {(~~ (static _.jvm))
(as-is (import: java/lang/CharSequence)
(import: java/lang/Appendable
(append [CharSequence] Appendable))
(import: java/lang/StringBuilder
(new [int])
(toString [] String)))}))
(`` (abstract: #export Buffer
{#.doc "Immutable text buffer for efficient text concatenation."}
(for {(~~ (static _.jvm))
[Nat (-> StringBuilder StringBuilder)]}
## default
(Row Text))
(def: #export empty
Buffer
(:abstraction (for {(~~ (static _.jvm))
[+0 id]}
## default
row.empty)))
(def: #export (append chunk buffer)
(-> Text Buffer Buffer)
(for {(~~ (static _.jvm))
(let [[capacity transform] (:representation buffer)
append! (: (-> Text StringBuilder StringBuilder)
(function (_ chunk builder)
(exec (Appendable::append [(:coerce 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 _.jvm))
(|> 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 _.jvm))
(let [[capacity transform] (:representation buffer)]
(|> (StringBuilder::new [(.int capacity)])
transform
(StringBuilder::toString [])))}
## default
(row/fold (function (_ chunk total)
(format total chunk))
""
(:representation buffer))))
))
|
