module Text.Numeral.Language.EO
( cardinal
, struct
) where
import "base" Data.Function ( ($), const, fix )
import "base" Data.Maybe ( Maybe(Just) )
import "base" Data.Monoid ( Monoid )
import "base" Data.String ( IsString )
import "base" Prelude ( Integral )
import "base-unicode-symbols" Data.Function.Unicode ( (∘) )
import qualified "containers" Data.Map as M ( fromList, lookup )
import "numerals-base" Text.Numeral
import qualified "numerals-base" Text.Numeral.Exp.Classes as C
cardinal ∷ (Integral α, Monoid s, IsString s) ⇒ α → Maybe s
cardinal = cardinalRepr ∘ struct
struct ∷ (Integral α, C.Unknown β, C.Lit β, C.Add β, C.Mul β) ⇒ α → β
struct = checkPos
$ fix
$ findRule ( 0, lit )
[ ( 11, step 10 10 R L)
, (100, step 100 10 R L)
]
1000
cardinalRepr ∷ (Monoid s, IsString s) ⇒ Exp → Maybe s
cardinalRepr = render defaultRepr
{ reprValue = \n → M.lookup n syms
, reprAdd = Just $ \_ _ _ → " "
, reprMul = Just $ \_ _ _ → ""
}
where
syms =
M.fromList
[ (0, const "nul")
, (1, const "unu")
, (2, const "du")
, (3, const "tri")
, (4, const "kvar")
, (5, const "kvin")
, (6, const "ses")
, (7, const "sep")
, (8, const "ok")
, (9, const "naŭ")
, (10, const "dek")
, (100, const "cent")
, (1000, const "mil")
]