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|
(.module:
[lux #*
[abstract
monad]
[control
["p" parser ("#@." monad)
["l" text]]]
[data
["." product]
["." error]
["." maybe]
[number (#+ hex)
["." nat ("#@." decimal)]]
[collection
["." list ("#@." fold monad)]]]
["." macro (#+ with-gensyms)
["." code]
["s" syntax (#+ syntax:)]]]
["." //
format])
(def: regex-char^
(l.Lexer Text)
(l.none-of "\.|&()[]{}"))
(def: escaped-char^
(l.Lexer Text)
(do p.monad
[? (l.this? "\")]
(if ?
l.any
regex-char^)))
(def: (refine^ refinement^ base^)
(All [a] (-> (l.Lexer a) (l.Lexer Text) (l.Lexer Text)))
(do p.monad
[output base^
_ (l.local output refinement^)]
(wrap output)))
(def: word^
(l.Lexer Text)
(p.either l.alpha-num
(l.one-of "_")))
(def: (copy reference)
(-> Text (l.Lexer Text))
(p.after (l.this reference) (p@wrap reference)))
(def: (join-text^ part^)
(-> (l.Lexer (List Text)) (l.Lexer Text))
(do p.monad
[parts part^]
(wrap (//.join-with "" parts))))
(def: name-char^
(l.Lexer Text)
(l.none-of (format "[]{}()s#.<>" //.double-quote)))
(def: name-part^
(l.Lexer Text)
(do p.monad
[head (refine^ (l.not l.decimal)
name-char^)
tail (l.some name-char^)]
(wrap (format head tail))))
(def: (name^ current-module)
(-> Text (l.Lexer Name))
($_ p.either
(p.and (p@wrap current-module) (p.after (l.this "..") name-part^))
(p.and name-part^ (p.after (l.this ".") name-part^))
(p.and (p@wrap "lux") (p.after (l.this ".") name-part^))
(p.and (p@wrap "") name-part^)))
(def: (re-var^ current-module)
(-> Text (l.Lexer Code))
(do p.monad
[name (l.enclosed ["\@<" ">"] (name^ current-module))]
(wrap (` (: (l.Lexer Text) (~ (code.identifier name)))))))
(def: re-range^
(l.Lexer Code)
(do p.monad
[from (|> regex-char^ (:: @ map (|>> (//.nth 0) maybe.assume)))
_ (l.this "-")
to (|> regex-char^ (:: @ map (|>> (//.nth 0) maybe.assume)))]
(wrap (` (l.range (~ (code.nat from)) (~ (code.nat to)))))))
(def: re-char^
(l.Lexer Code)
(do p.monad
[char escaped-char^]
(wrap (` ((~! ..copy) (~ (code.text char)))))))
(def: re-options^
(l.Lexer Code)
(do p.monad
[options (l.many escaped-char^)]
(wrap (` (l.one-of (~ (code.text options)))))))
(def: re-user-class^'
(l.Lexer Code)
(do p.monad
[negate? (p.maybe (l.this "^"))
parts (p.many ($_ p.either
re-range^
re-options^))]
(wrap (case negate?
(#.Some _) (` (l.not ($_ p.either (~+ parts))))
#.None (` ($_ p.either (~+ parts)))))))
(def: re-user-class^
(l.Lexer Code)
(do p.monad
[_ (wrap [])
init re-user-class^'
rest (p.some (p.after (l.this "&&") (l.enclosed ["[" "]"] re-user-class^')))]
(wrap (list@fold (function (_ refinement base)
(` ((~! refine^) (~ refinement) (~ base))))
init
rest))))
(def: blank^
(l.Lexer Text)
(l.one-of (format " " //.tab)))
(def: ascii^
(l.Lexer Text)
(l.range (hex "0") (hex "7F")))
(def: control^
(l.Lexer Text)
(p.either (l.range (hex "0") (hex "1F"))
(l.one-of (//.from-code (hex "7F")))))
(def: punct^
(l.Lexer Text)
(l.one-of (format "!#$%&'()*+,-./:;<=>?@[\]^_`{|}~"
//.double-quote)))
(def: graph^
(l.Lexer Text)
(p.either punct^ l.alpha-num))
(def: print^
(l.Lexer Text)
(p.either graph^
(l.one-of (//.from-code (hex "20")))))
(def: re-system-class^
(l.Lexer Code)
(do p.monad
[]
($_ p.either
(p.after (l.this ".") (wrap (` l.any)))
(p.after (l.this "\d") (wrap (` l.decimal)))
(p.after (l.this "\D") (wrap (` (l.not l.decimal))))
(p.after (l.this "\s") (wrap (` l.space)))
(p.after (l.this "\S") (wrap (` (l.not l.space))))
(p.after (l.this "\w") (wrap (` (~! word^))))
(p.after (l.this "\W") (wrap (` (l.not (~! word^)))))
(p.after (l.this "\p{Lower}") (wrap (` l.lower)))
(p.after (l.this "\p{Upper}") (wrap (` l.upper)))
(p.after (l.this "\p{Alpha}") (wrap (` l.alpha)))
(p.after (l.this "\p{Digit}") (wrap (` l.decimal)))
(p.after (l.this "\p{Alnum}") (wrap (` l.alpha-num)))
(p.after (l.this "\p{Space}") (wrap (` l.space)))
(p.after (l.this "\p{HexDigit}") (wrap (` l.hexadecimal)))
(p.after (l.this "\p{OctDigit}") (wrap (` l.octal)))
(p.after (l.this "\p{Blank}") (wrap (` (~! blank^))))
(p.after (l.this "\p{ASCII}") (wrap (` (~! ascii^))))
(p.after (l.this "\p{Contrl}") (wrap (` (~! control^))))
(p.after (l.this "\p{Punct}") (wrap (` (~! punct^))))
(p.after (l.this "\p{Graph}") (wrap (` (~! graph^))))
(p.after (l.this "\p{Print}") (wrap (` (~! print^))))
)))
(def: re-class^
(l.Lexer Code)
(p.either re-system-class^
(l.enclosed ["[" "]"] re-user-class^)))
(def: number^
(l.Lexer Nat)
(|> (l.many l.decimal)
(p.codec nat.decimal)))
(def: re-back-reference^
(l.Lexer Code)
(p.either (do p.monad
[_ (l.this "\")
id number^]
(wrap (` ((~! ..copy) (~ (code.identifier ["" (nat@encode id)]))))))
(do p.monad
[_ (l.this "\k<")
captured-name name-part^
_ (l.this ">")]
(wrap (` ((~! ..copy) (~ (code.identifier ["" captured-name]))))))))
(def: (re-simple^ current-module)
(-> Text (l.Lexer Code))
($_ p.either
re-class^
(re-var^ current-module)
re-back-reference^
re-char^
))
(def: (re-simple-quantified^ current-module)
(-> Text (l.Lexer Code))
(do p.monad
[base (re-simple^ current-module)
quantifier (l.one-of "?*+")]
(case quantifier
"?"
(wrap (` (p.default "" (~ base))))
"*"
(wrap (` ((~! join-text^) (p.some (~ base)))))
## "+"
_
(wrap (` ((~! join-text^) (p.many (~ base)))))
)))
(def: (re-counted-quantified^ current-module)
(-> Text (l.Lexer Code))
(do p.monad
[base (re-simple^ current-module)]
(l.enclosed ["{" "}"]
($_ p.either
(do @
[[from to] (p.and number^ (p.after (l.this ",") number^))]
(wrap (` ((~! join-text^) (p.between (~ (code.nat from))
(~ (code.nat to))
(~ base))))))
(do @
[limit (p.after (l.this ",") number^)]
(wrap (` ((~! join-text^) (p.at-most (~ (code.nat limit)) (~ base))))))
(do @
[limit (p.before (l.this ",") number^)]
(wrap (` ((~! join-text^) (p.at-least (~ (code.nat limit)) (~ base))))))
(do @
[limit number^]
(wrap (` ((~! join-text^) (p.exactly (~ (code.nat limit)) (~ base))))))))))
(def: (re-quantified^ current-module)
(-> Text (l.Lexer Code))
(p.either (re-simple-quantified^ current-module)
(re-counted-quantified^ current-module)))
(def: (re-complex^ current-module)
(-> Text (l.Lexer Code))
($_ p.either
(re-quantified^ current-module)
(re-simple^ current-module)))
(type: Re-Group
#Non-Capturing
(#Capturing [(Maybe Text) Nat]))
(def: (re-sequential^ capturing? re-scoped^ current-module)
(-> Bit
(-> Text (l.Lexer [Re-Group Code]))
Text
(l.Lexer [Nat Code]))
(do p.monad
[parts (p.many (p.or (re-complex^ current-module)
(re-scoped^ current-module)))
#let [g!total (code.identifier ["" "0total"])
g!temp (code.identifier ["" "0temp"])
[_ names steps] (list@fold (: (-> (Either Code [Re-Group Code])
[Nat (List Code) (List (List Code))]
[Nat (List Code) (List (List Code))])
(function (_ part [idx names steps])
(case part
(^or (#.Left complex) (#.Right [#Non-Capturing complex]))
[idx
names
(list& (list g!temp complex
(' #let) (` [(~ g!total) (:: (~! //.monoid) (~' compose) (~ g!total) (~ g!temp))]))
steps)]
(#.Right [(#Capturing [?name num-captures]) scoped])
(let [[idx! name!] (case ?name
(#.Some _name)
[idx (code.identifier ["" _name])]
#.None
[(inc idx) (code.identifier ["" (nat@encode idx)])])
access (if (n/> 0 num-captures)
(` ((~! product.left) (~ name!)))
name!)]
[idx!
(list& name! names)
(list& (list name! scoped
(' #let) (` [(~ g!total) (:: (~! //.monoid) (~' compose) (~ g!total) (~ access))]))
steps)])
)))
[0
(: (List Code) (list))
(: (List (List Code)) (list))]
parts)]]
(wrap [(if capturing?
(list.size names)
0)
(` (do p.monad
[(~ (' #let)) [(~ g!total) ""]
(~+ (|> steps list.reverse list@join))]
((~ (' wrap)) [(~ g!total) (~+ (list.reverse names))])))])
))
(def: (unflatten^ lexer)
(-> (l.Lexer Text) (l.Lexer [Text Any]))
(p.and lexer (:: p.monad wrap [])))
(def: (|||^ left right)
(All [l r] (-> (l.Lexer [Text l]) (l.Lexer [Text r]) (l.Lexer [Text (| l r)])))
(function (_ input)
(case (left input)
(#error.Success [input' [lt lv]])
(#error.Success [input' [lt (0 lv)]])
(#error.Failure _)
(case (right input)
(#error.Success [input' [rt rv]])
(#error.Success [input' [rt (1 rv)]])
(#error.Failure error)
(#error.Failure error)))))
(def: (|||_^ left right)
(All [l r] (-> (l.Lexer [Text l]) (l.Lexer [Text r]) (l.Lexer Text)))
(function (_ input)
(case (left input)
(#error.Success [input' [lt lv]])
(#error.Success [input' lt])
(#error.Failure _)
(case (right input)
(#error.Success [input' [rt rv]])
(#error.Success [input' rt])
(#error.Failure error)
(#error.Failure error)))))
(def: (prep-alternative [num-captures alt])
(-> [Nat Code] Code)
(if (n/> 0 num-captures)
alt
(` ((~! unflatten^) (~ alt)))))
(def: (re-alternative^ capturing? re-scoped^ current-module)
(-> Bit
(-> Text (l.Lexer [Re-Group Code]))
Text
(l.Lexer [Nat Code]))
(do p.monad
[#let [sub^ (re-sequential^ capturing? re-scoped^ current-module)]
head sub^
tail (p.some (p.after (l.this "|") sub^))]
(if (list.empty? tail)
(wrap head)
(wrap [(list@fold n/max (product.left head) (list@map product.left tail))
(` ($_ ((~ (if capturing?
(` (~! |||^))
(` (~! |||_^)))))
(~ (prep-alternative head))
(~+ (list@map prep-alternative tail))))]))))
(def: (re-scoped^ current-module)
(-> Text (l.Lexer [Re-Group Code]))
($_ p.either
(do p.monad
[_ (l.this "(?:")
[_ scoped] (re-alternative^ #0 re-scoped^ current-module)
_ (l.this ")")]
(wrap [#Non-Capturing scoped]))
(do p.monad
[complex (re-complex^ current-module)]
(wrap [#Non-Capturing complex]))
(do p.monad
[_ (l.this "(?<")
captured-name name-part^
_ (l.this ">")
[num-captures pattern] (re-alternative^ #1 re-scoped^ current-module)
_ (l.this ")")]
(wrap [(#Capturing [(#.Some captured-name) num-captures]) pattern]))
(do p.monad
[_ (l.this "(")
[num-captures pattern] (re-alternative^ #1 re-scoped^ current-module)
_ (l.this ")")]
(wrap [(#Capturing [#.None num-captures]) pattern]))))
(def: (regex^ current-module)
(-> Text (l.Lexer Code))
(:: p.monad map product.right (re-alternative^ #1 re-scoped^ current-module)))
(syntax: #export (regex {pattern s.text})
{#.doc (doc "Create lexers using regular-expression syntax."
"For example:"
"Literals"
(regex "a")
"Wildcards"
(regex ".")
"Escaping"
(regex "\.")
"Character classes"
(regex "\d")
(regex "\p{Lower}")
(regex "[abc]")
(regex "[a-z]")
(regex "[a-zA-Z]")
(regex "[a-z&&[def]]")
"Negation"
(regex "[^abc]")
(regex "[^a-z]")
(regex "[^a-zA-Z]")
(regex "[a-z&&[^bc]]")
(regex "[a-z&&[^m-p]]")
"Combinations"
(regex "aa")
(regex "a?")
(regex "a*")
(regex "a+")
"Specific amounts"
(regex "a{2}")
"At least"
(regex "a{1,}")
"At most"
(regex "a{,1}")
"Between"
(regex "a{1,2}")
"Groups"
(regex "a(.)c")
(regex "a(b+)c")
(regex "(\d{3})-(\d{3})-(\d{4})")
(regex "(\d{3})-(?:\d{3})-(\d{4})")
(regex "(?<code>\d{3})-\k<code>-(\d{4})")
(regex "(?<code>\d{3})-\k<code>-(\d{4})-\0")
(regex "(\d{3})-((\d{3})-(\d{4}))")
"Alternation"
(regex "a|b")
(regex "a(.)(.)|b(.)(.)")
)}
(do @
[current-module macro.current-module-name]
(case (|> (regex^ current-module)
(p.before l.end)
(l.run pattern))
(#error.Failure error)
(macro.fail (format "Error while parsing regular-expression:" //.new-line
error))
(#error.Success regex)
(wrap (list regex))
)))
(syntax: #export (^regex {[pattern bindings] (s.form (p.and s.text (p.maybe s.any)))}
body
{branches (p.many s.any)})
{#.doc (doc "Allows you to test text against regular expressions."
(case some-text
(^regex "(\d{3})-(\d{3})-(\d{4})"
[_ country-code area-code place-code])
do-some-thing-when-number
(^regex "\w+")
do-some-thing-when-word
_
do-something-else))}
(with-gensyms [g!temp]
(wrap (list& (` (^multi (~ g!temp)
[((~! l.run) (~ g!temp) (regex (~ (code.text pattern))))
(#error.Success (~ (maybe.default g!temp bindings)))]))
body
branches))))
|