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(;module:
lux
(lux [io]
(control monad)
(data [error #- fail]
[product]
[text "T/" Eq<Text>]
text/format)
[compiler]
(macro [ast]
["s" syntax #+ syntax:])
["R" math/random]
pipe
[lexer]
(lexer ["&" regex]))
lux/test)
## [Utils]
(def: (should-pass regex input)
(-> (lexer;Lexer Text) Text Bool)
(|> (lexer;run input regex)
(case> (#;Right parsed)
(T/= parsed input)
_
false)))
(def: (should-passT test regex input)
(-> Text (lexer;Lexer Text) Text Bool)
(|> (lexer;run input regex)
(case> (#;Right parsed)
(T/= test parsed)
_
false)))
(def: (should-fail regex input)
(All [a] (-> (lexer;Lexer a) Text Bool))
(|> (lexer;run input regex)
(case> (#;Left _) true _ false)))
(syntax: (should-check pattern regex input)
(wrap (list (` (|> (lexer;run (~ input) (~ regex))
(case> (^ (#;Right (~ pattern)))
true
(~' _)
false))))))
## [Tests]
(test: "Regular Expressions [Basics]"
(assert "Can parse character literals."
(and (should-pass (&;regex "a") "a")
(should-fail (&;regex "a") ".")
(should-pass (&;regex "\\.") ".")
(should-fail (&;regex "\\.") "a"))))
(test: "Regular Expressions [System character classes]"
($_ seq
(assert "Can parse anything."
(should-pass (&;regex ".") "a"))
(assert "Can parse digits."
(and (should-pass (&;regex "\\d") "0")
(should-fail (&;regex "\\d") "m")))
(assert "Can parse non digits."
(and (should-pass (&;regex "\\D") "m")
(should-fail (&;regex "\\D") "0")))
(assert "Can parse white-space."
(and (should-pass (&;regex "\\s") " ")
(should-fail (&;regex "\\s") "m")))
(assert "Can parse non white-space."
(and (should-pass (&;regex "\\S") "m")
(should-fail (&;regex "\\S") " ")))
(assert "Can parse word characters."
(and (should-pass (&;regex "\\w") "_")
(should-fail (&;regex "\\w") "^")))
(assert "Can parse non word characters."
(and (should-pass (&;regex "\\W") ".")
(should-fail (&;regex "\\W") "a")))
))
(test: "Regular Expressions [Special system character classes : Part 1]"
($_ seq
(assert "Can parse using special character classes."
(and (and (should-pass (&;regex "\\p{Lower}") "m")
(should-fail (&;regex "\\p{Lower}") "M"))
(and (should-pass (&;regex "\\p{Upper}") "M")
(should-fail (&;regex "\\p{Upper}") "m"))
(and (should-pass (&;regex "\\p{Alpha}") "M")
(should-fail (&;regex "\\p{Alpha}") "0"))
(and (should-pass (&;regex "\\p{Digit}") "1")
(should-fail (&;regex "\\p{Digit}") "n"))
(and (should-pass (&;regex "\\p{Alnum}") "1")
(should-fail (&;regex "\\p{Alnum}") "."))
(and (should-pass (&;regex "\\p{Space}") " ")
(should-fail (&;regex "\\p{Space}") "."))
))
))
(test: "Regular Expressions [Special system character classes : Part 2]"
($_ seq
(assert "Can parse using special character classes."
(and (and (should-pass (&;regex "\\p{HexDigit}") "a")
(should-fail (&;regex "\\p{HexDigit}") "."))
(and (should-pass (&;regex "\\p{OctDigit}") "6")
(should-fail (&;regex "\\p{OctDigit}") "."))
(and (should-pass (&;regex "\\p{Blank}") "\t")
(should-fail (&;regex "\\p{Blank}") "."))
(and (should-pass (&;regex "\\p{ASCII}") "\t")
(should-fail (&;regex "\\p{ASCII}") "\u1234"))
(and (should-pass (&;regex "\\p{Contrl}") "\u0012")
(should-fail (&;regex "\\p{Contrl}") "a"))
(and (should-pass (&;regex "\\p{Punct}") "@")
(should-fail (&;regex "\\p{Punct}") "a"))
(and (should-pass (&;regex "\\p{Graph}") "@")
(should-fail (&;regex "\\p{Graph}") " "))
(and (should-pass (&;regex "\\p{Print}") "\u0020")
(should-fail (&;regex "\\p{Print}") "\u1234"))
))
))
(test: "Regular Expressions [Custom character classes : Part 1]"
($_ seq
(assert "Can parse using custom character classes."
(and (should-pass (&;regex "[abc]") "a")
(should-fail (&;regex "[abc]") "m")))
(assert "Can parse using character ranges."
(and (should-pass (&;regex "[a-z]") "a")
(should-pass (&;regex "[a-z]") "m")
(should-pass (&;regex "[a-z]") "z")))
(assert "Can combine character ranges."
(and (should-pass (&;regex "[a-zA-Z]") "a")
(should-pass (&;regex "[a-zA-Z]") "m")
(should-pass (&;regex "[a-zA-Z]") "z")
(should-pass (&;regex "[a-zA-Z]") "A")
(should-pass (&;regex "[a-zA-Z]") "M")
(should-pass (&;regex "[a-zA-Z]") "Z")))
))
(test: "Regular Expressions [Custom character classes : Part 2]"
($_ seq
(assert "Can negate custom character classes."
(and (should-fail (&;regex "[^abc]") "a")
(should-pass (&;regex "[^abc]") "m")))
(assert "Can negate character ranges.."
(and (should-fail (&;regex "[^a-z]") "a")
(should-pass (&;regex "[^a-z]") "0")))
(assert "Can parse negate combinations of character ranges."
(and (should-fail (&;regex "[^a-zA-Z]") "a")
(should-pass (&;regex "[^a-zA-Z]") "0")))
))
(test: "Regular Expressions [Custom character classes : Part 3]"
($_ seq
(assert "Can make custom character classes more specific."
(and (let [RE (&;regex "[a-z&&[def]]")]
(and (should-fail RE "a")
(should-pass RE "d")))
(let [RE (&;regex "[a-z&&[^bc]]")]
(and (should-pass RE "a")
(should-fail RE "b")))
(let [RE (&;regex "[a-z&&[^m-p]]")]
(and (should-pass RE "a")
(should-fail RE "m")
(should-fail RE "p")))))
))
(test: "Regular Expressions [Reference]"
(let [number (&;regex "\\d+")]
(assert "Can build complex regexs by combining simpler ones."
(should-check ["809-345-6789" "809" "345" "6789"] (&;regex "(\\@<number>)-(\\@<number>)-(\\@<number>)") "809-345-6789"))))
(test: "Regular Expressions [Fuzzy Quantifiers]"
($_ seq
(assert "Can sequentially combine patterns."
(should-passT "aa" (&;regex "aa") "aa"))
(assert "Can match patterns optionally."
(and (should-passT "a" (&;regex "a?") "a")
(should-passT "" (&;regex "a?") "")))
(assert "Can match a pattern 0 or more times."
(and (should-passT "aaa" (&;regex "a*") "aaa")
(should-passT "" (&;regex "a*") "")))
(assert "Can match a pattern 1 or more times."
(and (should-passT "aaa" (&;regex "a+") "aaa")
(should-passT "a" (&;regex "a+") "a")
(should-fail (&;regex "a+") "")))
))
(test: "Regular Expressions [Crisp Quantifiers]"
($_ seq
(assert "Can match a pattern N times."
(and (should-passT "aa" (&;regex "a{2}") "aa")
(should-passT "a" (&;regex "a{1}") "aa")
(should-fail (&;regex "a{3}") "aa")))
(assert "Can match a pattern at-least N times."
(and (should-passT "aa" (&;regex "a{1,}") "aa")
(should-passT "aa" (&;regex "a{2,}") "aa")
(should-fail (&;regex "a{3,}") "aa")))
(assert "Can match a pattern at-most N times."
(and (should-passT "a" (&;regex "a{,1}") "aa")
(should-passT "aa" (&;regex "a{,2}") "aa")
(should-passT "aa" (&;regex "a{,3}") "aa")))
(assert "Can match a pattern between N and M times."
(and (should-passT "a" (&;regex "a{1,2}") "a")
(should-passT "aa" (&;regex "a{1,2}") "aa")
(should-passT "aa" (&;regex "a{1,2}") "aaa")))
))
(test: "Regular Expressions [Groups]"
($_ seq
(assert "Can extract groups of sub-matches specified in a pattern."
(and (should-check ["abc" "b"] (&;regex "a(.)c") "abc")
(should-check ["abbbbbc" "bbbbb"] (&;regex "a(b+)c") "abbbbbc")
(should-check ["809-345-6789" "809" "345" "6789"] (&;regex "(\\d{3})-(\\d{3})-(\\d{4})") "809-345-6789")
(should-check ["809-345-6789" "809" "6789"] (&;regex "(\\d{3})-(?:\\d{3})-(\\d{4})") "809-345-6789")
(should-check ["809-809-6789" "809" "6789"] (&;regex "(\\d{3})-\\0-(\\d{4})") "809-809-6789")
(should-check ["809-809-6789" "809" "6789"] (&;regex "(?<code>\\d{3})-\\k<code>-(\\d{4})") "809-809-6789")
(should-check ["809-809-6789-6789" "809" "6789"] (&;regex "(?<code>\\d{3})-\\k<code>-(\\d{4})-\\0") "809-809-6789-6789")))
(assert "Can specify groups within groups."
(should-check ["809-345-6789" "809" ["345-6789" "345" "6789"]] (&;regex "(\\d{3})-((\\d{3})-(\\d{4}))") "809-345-6789"))
))
(test: "Regular Expressions [Alternation]"
($_ seq
(assert "Can specify alternative patterns."
(and (should-check ["a" (+0 [])] (&;regex "a|b") "a")
(should-check ["b" (+1 [])] (&;regex "a|b") "b")
(should-fail (&;regex "a|b") "c")))
(assert "Can have groups within alternations."
(and (should-check ["abc" (+0 ["b" "c"])] (&;regex "a(.)(.)|b(.)(.)") "abc")
(should-check ["bcd" (+1 ["c" "d"])] (&;regex "a(.)(.)|b(.)(.)") "bcd")
(should-fail (&;regex "a(.)(.)|b(.)(.)") "cde")
(should-check ["809-345-6789" (+0 ["809" "345-6789" "345" "6789"])]
(&;regex "(\\d{3})-((\\d{3})-(\\d{4}))|b(.)d")
"809-345-6789")))
))
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