mirror of
https://github.com/idris-lang/Idris2.git
synced 2024-12-18 00:31:57 +03:00
343 lines
9.7 KiB
Idris
343 lines
9.7 KiB
Idris
module Data.Strings
|
|
|
|
import Data.List
|
|
import Data.List1
|
|
|
|
export
|
|
singleton : Char -> String
|
|
singleton c = strCons c ""
|
|
|
|
partial
|
|
foldr1 : (a -> a -> a) -> List a -> a
|
|
foldr1 _ [x] = x
|
|
foldr1 f (x::xs) = f x (foldr1 f xs)
|
|
|
|
partial
|
|
foldl1 : (a -> a -> a) -> List a -> a
|
|
foldl1 f (x::xs) = foldl f x xs
|
|
|
|
%foreign
|
|
"scheme:string-pack"
|
|
"javascript:lambda:(xs)=>''.concat(...__prim_idris2js_array(xs))"
|
|
fastPack : List Char -> String
|
|
|
|
%foreign
|
|
"scheme:string-unpack"
|
|
fastUnpack : String -> List Char
|
|
|
|
-- This works quickly because when string-concat builds the result, it allocates
|
|
-- enough room in advance so there's only one allocation, rather than lots!
|
|
%foreign
|
|
"scheme:string-concat"
|
|
"javascript:lambda:(xs)=>''.concat(...__prim_idris2js_array(xs))"
|
|
export
|
|
fastConcat : List String -> String
|
|
|
|
-- This is a deprecated alias for fastConcat for backwards compatibility
|
|
-- (unfortunately, we don't have %deprecated yet).
|
|
export
|
|
fastAppend : List String -> String
|
|
fastAppend = fastConcat
|
|
|
|
||| Splits a character list into a list of whitespace separated character lists.
|
|
|||
|
|
||| ```idris example
|
|
||| words' (unpack " A B C D E ")
|
|
||| ```
|
|
words' : List Char -> List (List Char)
|
|
words' s = case dropWhile isSpace s of
|
|
[] => []
|
|
s' => let (w, s'') = break isSpace s'
|
|
in w :: words' s''
|
|
|
|
||| Splits a string into a list of whitespace separated strings.
|
|
|||
|
|
||| ```idris example
|
|
||| words " A B C D E "
|
|
||| ```
|
|
export
|
|
words : String -> List String
|
|
words s = map pack (words' (unpack s))
|
|
|
|
||| Joins the character lists by spaces into a single character list.
|
|
|||
|
|
||| ```idris example
|
|
||| unwords' [['A'], ['B', 'C'], ['D'], ['E']]
|
|
||| ```
|
|
unwords' : List (List Char) -> List Char
|
|
unwords' [] = []
|
|
unwords' ws = assert_total (foldr1 addSpace ws) where
|
|
addSpace : List Char -> List Char -> List Char
|
|
addSpace w s = w ++ (' ' :: s)
|
|
|
|
||| Joins the strings by spaces into a single string.
|
|
|||
|
|
||| ```idris example
|
|
||| unwords ["A", "BC", "D", "E"]
|
|
||| ```
|
|
export
|
|
unwords : List String -> String
|
|
unwords = pack . unwords' . map unpack
|
|
|
|
||| Splits a character list into a list of newline separated character lists.
|
|
|||
|
|
||| ```idris example
|
|
||| lines' (unpack "\rA BC\nD\r\nE\n")
|
|
||| ```
|
|
lines' : List Char -> List (List Char)
|
|
lines' [] = []
|
|
lines' s = case break isNL s of
|
|
(l, s') => l :: case s' of
|
|
[] => []
|
|
_ :: s'' => lines' (assert_smaller s s'')
|
|
|
|
||| Splits a string into a list of newline separated strings.
|
|
|||
|
|
||| ```idris example
|
|
||| lines "\rA BC\nD\r\nE\n"
|
|
||| ```
|
|
export
|
|
lines : String -> List String
|
|
lines s = map pack (lines' (unpack s))
|
|
|
|
||| Joins the character lists by newlines into a single character list.
|
|
|||
|
|
||| ```idris example
|
|
||| unlines' [['l','i','n','e'], ['l','i','n','e','2'], ['l','n','3'], ['D']]
|
|
||| ```
|
|
unlines' : List (List Char) -> List Char
|
|
unlines' [] = []
|
|
unlines' (l::ls) = l ++ '\n' :: unlines' ls
|
|
|
|
||| Joins the strings by newlines into a single string.
|
|
|||
|
|
||| ```idris example
|
|
||| unlines ["line", "line2", "ln3", "D"]
|
|
||| ```
|
|
export
|
|
unlines : List String -> String
|
|
unlines = pack . unlines' . map unpack
|
|
|
|
export
|
|
ltrim : String -> String
|
|
ltrim xs = pack (ltrimChars (unpack xs))
|
|
where
|
|
ltrimChars : List Char -> List Char
|
|
ltrimChars [] = []
|
|
ltrimChars (x :: xs) = if isSpace x then ltrimChars xs else (x :: xs)
|
|
|
|
export
|
|
trim : String -> String
|
|
trim = ltrim . reverse . ltrim . reverse
|
|
|
|
||| Splits the string into a part before the predicate
|
|
||| returns False and the rest of the string.
|
|
|||
|
|
||| ```idris example
|
|
||| span (/= 'C') "ABCD"
|
|
||| ```
|
|
||| ```idris example
|
|
||| span (/= 'C') "EFGH"
|
|
||| ```
|
|
export
|
|
span : (Char -> Bool) -> String -> (String, String)
|
|
span p xs
|
|
= case span p (unpack xs) of
|
|
(x, y) => (pack x, pack y)
|
|
|
|
||| Splits the string into a part before the predicate
|
|
||| returns True and the rest of the string.
|
|
|||
|
|
||| ```idris example
|
|
||| break (== 'C') "ABCD"
|
|
||| ```
|
|
||| ```idris example
|
|
||| break (== 'C') "EFGH"
|
|
||| ```
|
|
public export
|
|
break : (Char -> Bool) -> String -> (String, String)
|
|
break p = span (not . p)
|
|
|
|
|
|
||| Splits the string into parts with the predicate
|
|
||| indicating separator characters.
|
|
|||
|
|
||| ```idris example
|
|
||| split (== '.') ".AB.C..D"
|
|
||| ```
|
|
public export
|
|
split : (Char -> Bool) -> String -> List1 String
|
|
split p xs = map pack (split p (unpack xs))
|
|
|
|
export
|
|
stringToNatOrZ : String -> Nat
|
|
stringToNatOrZ = fromInteger . prim__cast_StringInteger
|
|
|
|
export
|
|
toUpper : String -> String
|
|
toUpper str = pack (map toUpper (unpack str))
|
|
|
|
export
|
|
toLower : String -> String
|
|
toLower str = pack (map toLower (unpack str))
|
|
|
|
export partial
|
|
strIndex : String -> Int -> Char
|
|
strIndex = prim__strIndex
|
|
|
|
export partial
|
|
strLength : String -> Int
|
|
strLength = prim__strLength
|
|
|
|
export partial
|
|
strSubstr : Int -> Int -> String -> String
|
|
strSubstr = prim__strSubstr
|
|
|
|
export partial
|
|
strTail : String -> String
|
|
strTail = prim__strTail
|
|
|
|
export
|
|
isPrefixOf : String -> String -> Bool
|
|
isPrefixOf a b = isPrefixOf (unpack a) (unpack b)
|
|
|
|
export
|
|
isSuffixOf : String -> String -> Bool
|
|
isSuffixOf a b = isSuffixOf (unpack a) (unpack b)
|
|
|
|
export
|
|
isInfixOf : String -> String -> Bool
|
|
isInfixOf a b = isInfixOf (unpack a) (unpack b)
|
|
|
|
public export
|
|
data StrM : String -> Type where
|
|
StrNil : StrM ""
|
|
StrCons : (x : Char) -> (xs : String) -> StrM (strCons x xs)
|
|
|
|
public export -- primitives, so assert_total and believe_me needed
|
|
strM : (x : String) -> StrM x
|
|
strM "" = StrNil
|
|
strM x
|
|
= assert_total $ believe_me $
|
|
StrCons (prim__strHead x) (prim__strTail x)
|
|
|
|
parseNumWithoutSign : List Char -> Integer -> Maybe Integer
|
|
parseNumWithoutSign [] acc = Just acc
|
|
parseNumWithoutSign (c :: cs) acc =
|
|
if (c >= '0' && c <= '9')
|
|
then parseNumWithoutSign cs ((acc * 10) + (cast ((ord c) - (ord '0'))))
|
|
else Nothing
|
|
|
|
||| Convert a positive number string to a Num.
|
|
|||
|
|
||| ```idris example
|
|
||| parsePositive "123"
|
|
||| ```
|
|
||| ```idris example
|
|
||| parsePositive {a=Int} " +123"
|
|
||| ```
|
|
public export
|
|
parsePositive : Num a => String -> Maybe a
|
|
parsePositive s = parsePosTrimmed (trim s)
|
|
where
|
|
parsePosTrimmed : String -> Maybe a
|
|
parsePosTrimmed s with (strM s)
|
|
parsePosTrimmed "" | StrNil = Nothing
|
|
parsePosTrimmed (strCons '+' xs) | (StrCons '+' xs) =
|
|
map fromInteger (parseNumWithoutSign (unpack xs) 0)
|
|
parsePosTrimmed (strCons x xs) | (StrCons x xs) =
|
|
if (x >= '0' && x <= '9')
|
|
then map fromInteger (parseNumWithoutSign (unpack xs) (cast (ord x - ord '0')))
|
|
else Nothing
|
|
|
|
||| Convert a number string to a Num.
|
|
|||
|
|
||| ```idris example
|
|
||| parseInteger " 123"
|
|
||| ```
|
|
||| ```idris example
|
|
||| parseInteger {a=Int} " -123"
|
|
||| ```
|
|
public export
|
|
parseInteger : (Num a, Neg a) => String -> Maybe a
|
|
parseInteger s = parseIntTrimmed (trim s)
|
|
where
|
|
parseIntTrimmed : String -> Maybe a
|
|
parseIntTrimmed s with (strM s)
|
|
parseIntTrimmed "" | StrNil = Nothing
|
|
parseIntTrimmed (strCons x xs) | (StrCons x xs) =
|
|
if (x == '-')
|
|
then map (\y => negate (fromInteger y)) (parseNumWithoutSign (unpack xs) 0)
|
|
else if (x == '+')
|
|
then map fromInteger (parseNumWithoutSign (unpack xs) (cast {from=Int} 0))
|
|
else if (x >= '0' && x <= '9')
|
|
then map fromInteger (parseNumWithoutSign (unpack xs) (cast (ord x - ord '0')))
|
|
else Nothing
|
|
|
|
|
|
||| Convert a number string to a Double.
|
|
|||
|
|
||| ```idris example
|
|
||| parseDouble "+123.123e-2"
|
|
||| ```
|
|
||| ```idris example
|
|
||| parseDouble {a=Int} " -123.123E+2"
|
|
||| ```
|
|
||| ```idris example
|
|
||| parseDouble {a=Int} " +123.123"
|
|
||| ```
|
|
export -- it's a bit too slow at compile time
|
|
parseDouble : String -> Maybe Double
|
|
parseDouble = mkDouble . wfe . trim
|
|
where
|
|
intPow : Integer -> Integer -> Double
|
|
intPow base exp = assert_total $ if exp > 0 then (num base exp) else 1 / (num base exp)
|
|
where
|
|
num : Integer -> Integer -> Double
|
|
num base 0 = 1
|
|
num base e = if e < 0
|
|
then cast base * num base (e + 1)
|
|
else cast base * num base (e - 1)
|
|
|
|
natpow : Double -> Nat -> Double
|
|
natpow x Z = 1
|
|
natpow x (S n) = x * (natpow x n)
|
|
|
|
mkDouble : Maybe (Double, Double, Integer) -> Maybe Double
|
|
mkDouble (Just (w, f, e)) = let ex = intPow 10 e in
|
|
Just $ (w * ex + f * ex)
|
|
mkDouble Nothing = Nothing
|
|
|
|
wfe : String -> Maybe (Double, Double, Integer)
|
|
wfe cs = case split (== '.') cs of
|
|
(wholeAndExp :: []) =>
|
|
case split (\c => c == 'e' || c == 'E') wholeAndExp of
|
|
(whole::exp::[]) =>
|
|
do
|
|
w <- cast {from=Integer} <$> parseInteger whole
|
|
e <- parseInteger exp
|
|
pure (w, 0, e)
|
|
(whole::[]) =>
|
|
do
|
|
w <- cast {from=Integer} <$> parseInteger whole
|
|
pure (w, 0, 0)
|
|
_ => Nothing
|
|
(whole::fracAndExp::[]) =>
|
|
case split (\c => c == 'e' || c == 'E') fracAndExp of
|
|
(""::exp::[]) => Nothing
|
|
(frac::exp::[]) =>
|
|
do
|
|
w <- cast {from=Integer} <$> parseInteger whole
|
|
f <- (/ (natpow 10 (length frac))) <$>
|
|
(cast <$> parseNumWithoutSign (unpack frac) 0)
|
|
e <- parseInteger exp
|
|
pure (w, if w < 0 then (-f) else f, e)
|
|
(frac::[]) =>
|
|
do
|
|
w <- cast {from=Integer} <$> parseInteger whole
|
|
f <- (/ (natpow 10 (length frac))) <$>
|
|
(cast <$> parseNumWithoutSign (unpack frac) 0)
|
|
pure (w, if w < 0 then (-f) else f, 0)
|
|
_ => Nothing
|
|
_ => Nothing
|