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(import-macros {: map} :lib.macro)
(local number (require :lib.number))
(local {: must} (require :lib.utils))
(local peg
(if (pick-values 1 (pcall require :lpeg))
(require :lpeg)
(require :lpeglj)))
;; "not" is taken >:(
(fn pnot [p]
(- (peg.P 1) (peg.P p)))
(fn till [p]
(^ (pnot p) 1))
(fn maybe [p]
(^ (peg.P p) 0))
(fn anywhere [p]
(peg.P [(+ p (* 1 (peg.V 1)))]))
(local pegs {})
(tset pegs :number (^ (peg.R "09") 1))
(tset pegs :letter (+ (peg.R "az")
(peg.R "AZ")
"а" "б" "в" "г" "д" "е" "ё" "ж" "з" "и" "й" "к" "л" "м"
"н" "о" "п" "р" "с" "т" "у" "ф" "х" "ц" "ч" "ъ" "ы" "ь"
"э" "ю" "я"
"А" "Б" "В" "Г" "Д" "Е" "Ё" "Ж" "З" "И" "Й" "К" "Л" "М"
"Н" "О" "П" "Р" "С" "Т" "У" "Ф" "Х" "Ц" "Ч" "Ъ" "Ы" "Ь"
"Э" "Ю" "Я"))
(tset pegs :lat-letters (^ (+ (peg.R "az") (peg.R "AZ")) 1))
(tset pegs :space (peg.S "\n\t "))
(tset pegs :spaces (^ (peg.S "\n\t ") 1))
(tset pegs :tag-name (+ pegs.lat-letters pegs.number))
(tset pegs :attr
(peg.Ct (* (peg.Cg (^ (+ pegs.lat-letters "-") 1) :name)
(maybe (* "=\"" (peg.Cg (till "\"") :value) "\"")))))
(tset pegs :self-closing-tag
(* "<"
(peg.Cg
(+ (peg.P "area") "base" "br" "col" "embed" "hr"
"img" "input" "link" "meta" "param" "source"
"track" "wbr") ;; should be case insensitive
:tag)
(peg.Cg (peg.Ct (^ (+ pegs.space (peg.Cg pegs.attr)) 0)) :attrs)
(maybe "/") ">"))
(tset pegs :opening-tag
(* "<" (peg.Cg pegs.tag-name :tag)
(peg.Cg (peg.Ct (^ (+ pegs.space (peg.Cg pegs.attr)) 0)) :attrs)
">"))
(tset pegs :closing-tag (* "</" pegs.tag-name ">"))
(tset pegs :doctype
(* "<!DOCTYPE HTML" (^ pegs.attr 0) ">")) ;; should be case insensitive
(tset pegs :tag
(peg.P [(peg.Ct (+ pegs.self-closing-tag
(* pegs.opening-tag
(peg.Cg
(peg.Ct
(^ (+ (+ pegs.space (peg.V 1))
(peg.Cg (till pegs.closing-tag)))
0))
:nodes)
pegs.closing-tag)))]))
(tset pegs :html
(* pegs.doctype (peg.Ct (^ (+ pegs.space (peg.Cg pegs.tag)) 0))))
(fn tag [tag attrs contents]
(local tag (peg.P tag))
(local attrs-count (accumulate [sum 0 _ _ (pairs attrs)] (+ 1 sum)))
(local attr-peg
(fn [name value] (*
(^ (peg.P name) 1)
(if (~= value "")
(+
;; attributes may be wrapped in both " and '
(* "=\""
;; wildcard for any value
(if (= value "*")
(till "\"")
(peg.P value))
"\"")
(* "='"
;; wildcard for any value
(if (= value "*")
(till "'")
(peg.P value))
"'"))
(maybe (.. "=\" name \""))))))
(local attrs-peg
(accumulate [sum pegs.spaces
_ rule
(pairs (icollect [k v (pairs attrs)]
(attr-peg k v)))]
(+ rule sum)))
(if contents
(peg.P (*
(^ pegs.space 0)
;; opening tag
(* "<" tag (^ pegs.space 0)
(^ attrs-peg (- (* attrs-count 2) 1))
(^ pegs.space 0) ">")
;; tag contents
(^ pegs.space 0)
(if (= contents "*")
(till (* "</" tag ">"))
contents)
(^ pegs.space 0)
;; closing tag
(* "</" tag ">")))
(peg.P (*
(^ pegs.space 0)
;; opening tag
(* "<" tag (^ pegs.space 0)
(^ attrs-peg (- (* attrs-count 2) 1))
(^ pegs.space 0) (maybe "/") ">")))))
(fn match-many [html tag]
(: (peg.Ct (^ (peg.Ct tag) 1))
:match html))
(fn guess-tags [text]
(local text (if text (must (luna.utf8.lower text)) ""))
(if (: (anywhere (peg.P "зеленый чай")) :match text)
["Зеленый чай"]
(: (anywhere (peg.P "улун")) :match text)
["Улун"]
(: (anywhere (peg.P "белый чай")) :match text)
["Белый чай"]
(: (anywhere (peg.P "желтый чай")) :match text)
["Желтый чай"]
(: (anywhere (peg.P "красный чай")) :match text)
["Красный чай"]
(: (anywhere (peg.P "хэй ча")) :match text)
["Хэй ча"]
(: (anywhere (peg.P "шу пуэр")) :match text)
["Шу пуэр"]
(: (anywhere (+ (peg.P "шен пуэр") "шэн пуэр")) :match text)
["Шен пуэр"]
(: (anywhere (+ (peg.P "матча") "маття")) :match text)
["Матча"]
(: (anywhere (peg.P "габа")) :match text)
["Габа"]
[]))
(fn guess-year [text]
(number.string->number
(: (anywhere
(* (peg.C (^ (peg.R "09") 4))
(maybe " ")
(- (+ (peg.P "г") "год") (peg.P "гр"))))
:match text)))
(fn guess-weight [text extra-metrics]
(if text
(let [peg (peg.Ct
(anywhere
(* (+ (* (peg.C pegs.number)
(+ (peg.P "x") "X" "х" "Х")
(peg.C pegs.number))
(peg.C pegs.number))
(maybe (+ (peg.P " ") " "))
(* (peg.C
(if extra-metrics
(+ (peg.P "гр") "кг" (table.unpack extra-metrics))
(+ (peg.P "гр") "кг")))
(+ (pnot pegs.letter) -1)))))]
(let [result (peg:match text)]
(if result
(match result
[multiplier weight metric] (* (tonumber multiplier)
(tonumber weight)
(if (= metric "кг") 1000 1))
[weight metric] (* (tonumber weight)
(if (= metric "кг") 1000 1)))
nil)))
nil))
(fn test-guess-weight []
(assert (= nil (guess-weight "за 1")) "1")
(assert (= 120 (guess-weight "6x20гр")) "2")
(assert (= 140 (guess-weight "Знакомство с китайским чаем, 7х20 гр.")) "3")
(assert (= 357 (guess-weight "за 1 шт 357 гр")) "4")
(assert (= 1 (guess-weight "1гр")) "5")
(assert (= 150 (guess-weight "150 гр")) "6")
(assert (= 1000 (guess-weight "1кг")) "7")
(assert (= 150 (guess-weight "150 г" ["г"])) "8"))
(test-guess-weight)
(fn guess-volume [text]
(if text
(let [peg (peg.Ct
(anywhere
(* (peg.C pegs.number)
(maybe (+ (peg.P " ") " "))
(* (peg.C (+ (peg.P "мл") "л"))
(+ (pnot pegs.letter) -1)))))]
(let [result (peg:match text)]
(if result
(let [[number metric] result]
(* number (if (= metric "л") 1000 1)))
nil)))
nil))
(fn test-guess-volume []
(assert (= nil (guess-volume "Сервиз Хуа Хэ Няо")))
(assert (= 255 (guess-volume "Бутылка для чая «Походная» 255 мл")))
(assert (= 255 (guess-volume "Бутылка для чая «Походная» 255 мл"))))
(test-guess-volume)
{: match-many
: tag
: anywhere
: till
: maybe
: pegs
:not pnot
: guess-tags
: guess-year
: guess-weight
: guess-volume}
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