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|
(;module:
lux
(lux [io]
(control monad)
(data [text "T/" Eq<Text>]
(text format
["l" lexer])
[number]
["R" result]
(coll [list]))
["r" math/random "r/" Monad<Random>]
(macro [code])
test)
(luxc ["&" parser]))
(def: default-cursor
Cursor
{#;module ""
#;line +0
#;column +0})
(def: ident-part^
(r;Random Text)
(do r;Monad<Random>
[#let [digits "0123456789"
delimiters "()[]{}#;"
space "\t\v \n\r\f"
invalid-range (format digits delimiters space)
char-gen (|> r;nat
(r;filter (function [sample]
(not (text;contains? (text;from-code sample)
invalid-range)))))]
size (|> r;nat (:: @ map (|>. (n.% +20) (n.max +1))))]
(r;text' char-gen size)))
(def: ident^
(r;Random Ident)
(r;seq ident-part^ ident-part^))
(def: code^
(r;Random Code)
(let [numeric^ (: (r;Random Code)
($_ r;either
(|> r;bool (r/map (|>. #;Bool [default-cursor])))
(|> r;nat (r/map (|>. #;Nat [default-cursor])))
(|> r;int (r/map (|>. #;Int [default-cursor])))
(|> r;deg (r/map (|>. #;Deg [default-cursor])))
(|> r;real (r/map (|>. #;Real [default-cursor])))))
textual^ (: (r;Random Code)
($_ r;either
(do r;Monad<Random>
[size (|> r;nat (r/map (n.% +20)))]
(|> (r;text size) (r/map (|>. #;Text [default-cursor]))))
(|> ident^ (r/map (|>. #;Symbol [default-cursor])))
(|> ident^ (r/map (|>. #;Tag [default-cursor])))))
simple^ (: (r;Random Code)
($_ r;either
numeric^
textual^))]
(r;rec
(function [code^]
(let [multi^ (do r;Monad<Random>
[size (|> r;nat (r/map (n.% +3)))]
(r;list size code^))
composite^ (: (r;Random Code)
($_ r;either
(|> multi^ (r/map (|>. #;Form [default-cursor])))
(|> multi^ (r/map (|>. #;Tuple [default-cursor])))
(do r;Monad<Random>
[size (|> r;nat (r/map (n.% +3)))]
(|> (r;list size (r;seq code^ code^))
(r/map (|>. #;Record [default-cursor]))))))]
(r;either simple^
composite^))))))
(context: "Lux code parser."
[sample code^]
(test "Can parse Lux code."
(case (&;parse [default-cursor (code;to-text sample)])
(#R;Error error)
false
(#R;Success [_ parsed])
(:: code;Eq<Code> = parsed sample))
))
(def: comment-text^
(r;Random Text)
(let [char-gen (|> r;nat (r;filter (function [value]
(not (or (text;space? value)
(n.= (char "#") value)
(n.= (char "(") value)
(n.= (char ")") value))))))]
(do r;Monad<Random>
[size (|> r;nat (r/map (n.% +20)))]
(r;text' char-gen size))))
(def: comment^
(r;Random Text)
(r;either (do r;Monad<Random>
[comment comment-text^]
(wrap (format "## " comment "\n")))
(r;rec (function [nested^]
(do r;Monad<Random>
[comment (r;either comment-text^
nested^)]
(wrap (format "#( " comment " )#")))))))
(context: "Multi-line text & comments."
[#let [char-gen (|> r;nat (r;filter (function [value]
(not (or (text;space? value)
(n.= (char "\"") value))))))]
x char-gen
y char-gen
z char-gen
offset-size (|> r;nat (r/map (|>. (n.% +10) (n.max +1))))
#let [offset (text;join-with "" (list;repeat offset-size " "))]
sample code^
comment comment^
unbalanced-comment comment-text^]
($_ seq
(test "Will reject invalid multi-line text."
(let [bad-match (format (text;from-code x) "\n"
(text;from-code y) "\n"
(text;from-code z))]
(case (&;parse [default-cursor
(format "\"" bad-match "\"")])
(#R;Error error)
true
(#R;Success [_ parsed])
false)))
(test "Will accept valid multi-line text"
(let [good-input (format (text;from-code x) "\n"
offset (text;from-code y) "\n"
offset (text;from-code z))
good-output (format (text;from-code x) "\n"
(text;from-code y) "\n"
(text;from-code z))]
(case (&;parse [(|> default-cursor
(update@ #;column (n.+ (n.dec offset-size))))
(format "\"" good-input "\"")])
(#R;Error error)
false
(#R;Success [_ parsed])
(:: code;Eq<Code> =
parsed
(code;text good-output)))))
(test "Can handle comments."
(case (&;parse [default-cursor
(format comment (code;to-text sample))])
(#R;Error error)
false
(#R;Success [_ parsed])
(:: code;Eq<Code> = parsed sample)))
(test "Will reject unbalanced multi-line comments."
(and (case (&;parse [default-cursor
(format "#(" "#(" unbalanced-comment ")#"
(code;to-text sample))])
(#R;Error error)
true
(#R;Success [_ parsed])
false)
(case (&;parse [default-cursor
(format "#(" unbalanced-comment ")#" ")#"
(code;to-text sample))])
(#R;Error error)
true
(#R;Success [_ parsed])
false)))
))
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