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## Copyright (c) Eduardo Julian. All rights reserved.
## This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
## If a copy of the MPL was not distributed with this file,
## You can obtain one at http://mozilla.org/MPL/2.0/.
(;module:
lux
(lux/control eq
[ord]
codec
hash)
(.. [text "Text/" Monoid<Text>]))
## [Structures]
(struct: #export _ (Eq Char)
(def: (= x y)
(_lux_proc ["jvm" "ceq"] [x y])))
(struct: #export _ (Hash Char)
(def: eq Eq<Char>)
(def: hash
(|>. []
(_lux_proc ["jvm" "c2i"])
[]
(_lux_proc ["jvm" "i2l"])
int-to-nat)))
(struct: #export _ (ord;Ord Char)
(def: eq Eq<Char>)
(do-template [<name> <op>]
[(def: (<name> test subject)
(_lux_proc ["jvm" <op>] [subject test]))]
[< "clt"]
[> "cgt"]
)
(do-template [<name> <op>]
[(def: (<name> test subject)
(or (_lux_proc ["jvm" "ceq"] [subject test])
(_lux_proc ["jvm" <op>] [subject test])))]
[<= "clt"]
[>= "cgt"]
))
(struct: #export _ (Codec Text Char)
(def: (encode x)
(let [as-text (case x
#"\t" "\\t"
#"\b" "\\b"
#"\n" "\\n"
#"\r" "\\r"
#"\f" "\\f"
#"\"" "\\\""
#"\\" "\\\\"
_ (_lux_proc ["jvm" "invokevirtual:java.lang.Object:toString:"] [x]))]
($_ Text/append "#\"" as-text "\"")))
(def: (decode y)
(let [size (text;size y)]
(if (and (text;starts-with? "#\"" y)
(text;ends-with? "\"" y)
(or (n.= +4 size)
(n.= +5 size)))
(if (n.= +4 size)
(case (text;nth +2 y)
#;None
(#;Left (Text/append "Wrong syntax for Char: " y))
(#;Some char)
(#;Right char))
(case [(text;nth +2 y) (text;nth +3 y)]
[(#;Some #"\\") (#;Some char)]
(case char
#"t" (#;Right #"\t")
#"b" (#;Right #"\b")
#"n" (#;Right #"\n")
#"r" (#;Right #"\r")
#"f" (#;Right #"\f")
#"\"" (#;Right #"\"")
#"\\" (#;Right #"\\")
#"t" (#;Right #"\t")
_ (#;Left (Text/append "Wrong syntax for Char: " y)))
_
(#;Left (Text/append "Wrong syntax for Char: " y))))
(#;Left (Text/append "Wrong syntax for Char: " y))))))
## [Values]
(def: #export (space? x)
{#;doc "Checks whether the character is white-space."}
(-> Char Bool)
(_lux_proc ["jvm" "invokestatic:java.lang.Character:isWhitespace:char"] [x]))
(def: #export (as-text x)
(-> Char Text)
(_lux_proc ["jvm" "invokevirtual:java.lang.Object:toString:"] [x]))
(def: #export (char x)
(-> Nat Char)
(_lux_proc ["nat" "to-char"] [x]))
(def: #export (code x)
(-> Char Nat)
(_lux_proc ["char" "to-nat"] [x]))
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