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(.module:
[lux #*
[control
[monad (#+ do Monad)]
pipe
["p" parser]]
[data
["." error (#+ Error)]
["." text ("#;." equivalence)
format
["&" lexer]]
[collection
["." list]]]
[math
["r" random]]]
lux/test)
## [Utils]
(def: (should-fail input)
(All [a] (-> (Error a) Bit))
(case input
(#.Left _) #1
_ #0))
(def: (should-passT test input)
(-> Text (Error Text) Bit)
(case input
(#.Right output)
(text;= test output)
_
#0))
(def: (should-passL test input)
(-> (List Text) (Error (List Text)) Bit)
(let [(^open "list;.") (list.equivalence text.equivalence)]
(case input
(#.Right output)
(list;= test output)
_
#0)))
(def: (should-passE test input)
(-> (Either Text Text) (Error (Either Text Text)) Bit)
(case input
(#.Right output)
(case [test output]
[(#.Left test) (#.Left output)]
(text;= test output)
[(#.Right test) (#.Right output)]
(text;= test output)
_
#0)
_
#0))
## [Tests]
(context: "End"
($_ seq
(test "Can detect the end of the input."
(|> (&.run ""
&.end)
(case> (#.Right _) #1 _ #0)))
(test "Won't mistake non-empty text for no more input."
(|> (&.run "YOLO"
&.end)
(case> (#.Left _) #1 _ #0)))
))
(context: "Literals"
(<| (times 100)
(do @
[size (|> r.nat (:: @ map (|>> (n/% 100) (n/max 10))))
sample (r.unicode size)
non-sample (|> (r.unicode size)
(r.filter (|>> (text;= sample) not)))]
($_ seq
(test "Can find literal text fragments."
(and (|> (&.run sample
(&.this sample))
(case> (#.Right []) #1 _ #0))
(|> (&.run non-sample
(&.this sample))
(case> (#.Left _) #1 _ #0))))
))))
(context: "Custom lexers"
($_ seq
(test "Can lex anything"
(and (should-passT "A" (&.run "A"
&.any))
(should-fail (&.run ""
&.any))))
(test "Can lex characters ranges."
(and (should-passT "Y" (&.run "Y"
(&.range (char "X") (char "Z"))))
(should-fail (&.run "M"
(&.range (char "X") (char "Z"))))))
(test "Can lex upper-case and lower-case letters."
(and (should-passT "Y" (&.run "Y"
&.upper))
(should-fail (&.run "m"
&.upper))
(should-passT "y" (&.run "y"
&.lower))
(should-fail (&.run "M"
&.lower))))
(test "Can lex numbers."
(and (should-passT "1" (&.run "1"
&.decimal))
(should-fail (&.run " "
&.decimal))
(should-passT "7" (&.run "7"
&.octal))
(should-fail (&.run "8"
&.octal))
(should-passT "1" (&.run "1"
&.hexadecimal))
(should-passT "a" (&.run "a"
&.hexadecimal))
(should-passT "A" (&.run "A"
&.hexadecimal))
(should-fail (&.run " "
&.hexadecimal))
))
(test "Can lex alphabetic characters."
(and (should-passT "A" (&.run "A"
&.alpha))
(should-passT "a" (&.run "a"
&.alpha))
(should-fail (&.run "1"
&.alpha))))
(test "Can lex alphanumeric characters."
(and (should-passT "A" (&.run "A"
&.alpha-num))
(should-passT "a" (&.run "a"
&.alpha-num))
(should-passT "1" (&.run "1"
&.alpha-num))
(should-fail (&.run " "
&.alpha-num))))
(test "Can lex white-space."
(and (should-passT " " (&.run " "
&.space))
(should-fail (&.run "8"
&.space))))
))
(context: "Combinators"
($_ seq
(test "Can combine lexers sequentially."
(and (|> (&.run "YO"
(p.and &.any &.any))
(case> (#.Right ["Y" "O"]) #1
_ #0))
(should-fail (&.run "Y"
(p.and &.any &.any)))))
(test "Can create the opposite of a lexer."
(and (should-passT "a" (&.run "a"
(&.not (p.or &.decimal &.upper))))
(should-fail (&.run "A"
(&.not (p.or &.decimal &.upper))))))
(test "Can select from among a set of characters."
(and (should-passT "C" (&.run "C"
(&.one-of "ABC")))
(should-fail (&.run "D"
(&.one-of "ABC")))))
(test "Can avoid a set of characters."
(and (should-passT "D" (&.run "D"
(&.none-of "ABC")))
(should-fail (&.run "C"
(&.none-of "ABC")))))
(test "Can lex using arbitrary predicates."
(and (should-passT "D" (&.run "D"
(&.satisfies (function (_ c) #1))))
(should-fail (&.run "C"
(&.satisfies (function (_ c) #0))))))
(test "Can apply a lexer multiple times."
(and (should-passT "0123456789ABCDEF" (&.run "0123456789ABCDEF"
(&.many &.hexadecimal)))
(should-fail (&.run "yolo"
(&.many &.hexadecimal)))
(should-passT "" (&.run ""
(&.some &.hexadecimal)))))
))
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