numerals-0.3: src/Text/Numeral/Language/DE.hs
{-# LANGUAGE NoImplicitPrelude
, OverloadedStrings
, PackageImports
, UnicodeSyntax
#-}
{-|
[@ISO639-1@] de
[@ISO639-2B@] ger
[@ISO639-3@] deu
[@Native name@] Deutsch
[@English name@] German
-}
module Text.Numeral.Language.DE
( cardinal
, struct
) where
-------------------------------------------------------------------------------
-- Imports
-------------------------------------------------------------------------------
import "base" Data.Bool ( otherwise )
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, (-), Integer )
import "base-unicode-symbols" Data.Function.Unicode ( (∘) )
import "base-unicode-symbols" Data.List.Unicode ( (∈) )
import "base-unicode-symbols" Data.Ord.Unicode ( (≥) )
import qualified "containers" Data.Map as M ( fromList, lookup )
import "numerals-base" Text.Numeral
import "numerals-base" Text.Numeral.Misc ( dec )
import qualified "numerals-base" Text.Numeral.BigNum as BN
import qualified "numerals-base" Text.Numeral.Exp.Classes as C
-------------------------------------------------------------------------------
-- DE
-------------------------------------------------------------------------------
{-
Sources:
http://de.wikipedia.org/wiki/Zahlennamen
-}
cardinal ∷ (Integral α, C.Scale α, Monoid s, IsString s) ⇒ α → Maybe s
cardinal = cardinalRepr ∘ struct
struct ∷ ( Integral α, C.Scale α
, C.Unknown β, C.Lit β, C.Neg β, C.Add β, C.Mul β, C.Scale β
)
⇒ α → β
struct = pos $ fix $ rule `combine` pelletierScale R L BN.rule
where
rule = findRule ( 0, lit )
[ ( 13, add 10 L )
, ( 20, mul 10 L L)
, ( 100, step1 100 10 R L)
, (1000, step 1000 1000 R L)
]
(dec 6 - 1)
cardinalRepr ∷ (Monoid s, IsString s) ⇒ Exp → Maybe s
cardinalRepr = render defaultRepr
{ reprValue = \n → M.lookup n syms
, reprScale = pelletierRepr
, reprAdd = Just (⊞)
, reprMul = Just $ \_ _ _ → ""
, reprNeg = Just $ \_ _ → "minus "
}
where
(_ ⊞ (_ `Mul` Lit 10)) _ = "und"
(_ ⊞ _ ) _ = ""
syms =
M.fromList
[ (0, const "null")
, (1, \c → case c of
CtxAdd {} → "ein"
CtxMul _ (Lit n) _
| n ≥ dec 6 → "eine"
| n ≥ 100 → "ein"
_ → "eins"
)
, (2, \c → case c of
CtxMul _ (Lit 10) _ → "zwan"
_ → "zwei"
)
, (3, const "drei")
, (4, const "vier")
, (5, const "fünf")
, (6, \c → case c of
CtxAdd _ (Lit 10) _ → "sech"
CtxMul _ (Lit 10) _ → "sech"
_ → "sechs"
)
, (7, \c → case c of
CtxAdd _ (Lit 10) _ → "sieb"
CtxMul _ (Lit 10) _ → "sieb"
_ → "sieben"
)
, (8, const "acht")
, (9, const "neun")
, (10, \c → case c of
CtxMul _ (Lit 3) _ → "ßig"
CtxMul _ (Lit _) _ → "zig"
_ → "zehn"
)
, (11, const "elf")
, (12, const "zwölf")
, (100, const "hundert")
, (1000, const "tausend")
]
pelletierRepr ∷ (IsString s, Monoid s)
⇒ Integer → Integer → Exp → Ctx Exp → Maybe s
pelletierRepr =
BN.pelletierRepr
"illion" "illion"
"illiarde" "illiarde"
[ (8, BN.forms "okt" "okto" "okto" "okto" "oktin")
, (10, \c → case c of
CtxAdd _ (Lit 100) _ → "dezi"
CtxMul _ _ (CtxAdd _ (Lit 100) _) → "ginta"
CtxMul {} → "gint"
_ → "dez"
)
, (100, \c → case c of
CtxMul _ (Lit n) _
| n ∈ [2,3,6] → "zent"
| otherwise → "gent"
_ → "zent"
)
]