Copyright | (c) Dong Han 2017-2018 |
---|---|

License | BSD |

Maintainer | winterland1989@gmail.com |

Stability | experimental |

Portability | non-portable |

Safe Haskell | None |

Language | Haskell2010 |

Various combinators works on `Vec`

class instances.

## Synopsis

- cons :: Vec v a => a -> v a -> v a
- snoc :: Vec v a => v a -> a -> v a
- uncons :: Vec v a => v a -> Maybe (a, v a)
- unsnoc :: Vec v a => v a -> Maybe (v a, a)
- headMaybe :: Vec v a => v a -> Maybe a
- tailMayEmpty :: Vec v a => v a -> v a
- lastMaybe :: Vec v a => v a -> Maybe a
- initMayEmpty :: Vec v a => v a -> v a
- inits :: Vec v a => v a -> [v a]
- tails :: Vec v a => v a -> [v a]
- take :: Vec v a => Int -> v a -> v a
- drop :: Vec v a => Int -> v a -> v a
- takeR :: Vec v a => Int -> v a -> v a
- dropR :: Vec v a => Int -> v a -> v a
- slice :: Vec v a => Int -> Int -> v a -> v a
- splitAt :: Vec v a => Int -> v a -> (v a, v a)
- takeWhile :: Vec v a => (a -> Bool) -> v a -> v a
- takeWhileR :: Vec v a => (a -> Bool) -> v a -> v a
- dropWhile :: Vec v a => (a -> Bool) -> v a -> v a
- dropWhileR :: Vec v a => (a -> Bool) -> v a -> v a
- dropAround :: Vec v a => (a -> Bool) -> v a -> v a
- break :: Vec v a => (a -> Bool) -> v a -> (v a, v a)
- span :: Vec v a => (a -> Bool) -> v a -> (v a, v a)
- breakR :: Vec v a => (a -> Bool) -> v a -> (v a, v a)
- spanR :: Vec v a => (a -> Bool) -> v a -> (v a, v a)
- breakOn :: (Vec v a, Eq a) => v a -> v a -> (v a, v a)
- group :: (Vec v a, Eq a) => v a -> [v a]
- groupBy :: forall v a. Vec v a => (a -> a -> Bool) -> v a -> [v a]
- stripPrefix :: (Vec v a, Eq (v a)) => v a -> v a -> Maybe (v a)
- stripSuffix :: (Vec v a, Eq (v a)) => v a -> v a -> Maybe (v a)
- split :: (Vec v a, Eq a) => a -> v a -> [v a]
- splitWith :: Vec v a => (a -> Bool) -> v a -> [v a]
- splitOn :: (Vec v a, Eq a) => v a -> v a -> [v a]
- isPrefixOf :: forall v a. (Vec v a, Eq (v a)) => v a -> v a -> Bool
- isSuffixOf :: forall v a. (Vec v a, Eq (v a)) => v a -> v a -> Bool
- isInfixOf :: (Vec v a, Eq a) => v a -> v a -> Bool
- commonPrefix :: (Vec v a, Eq a) => v a -> v a -> (v a, v a, v a)
- words :: Bytes -> [Bytes]
- lines :: Bytes -> [Bytes]
- unwords :: [Bytes] -> Bytes
- unlines :: [Bytes] -> Bytes
- padLeft :: Vec v a => Int -> a -> v a -> v a
- padRight :: Vec v a => Int -> a -> v a -> v a
- reverse :: forall v a. Vec v a => v a -> v a
- intersperse :: forall v a. Vec v a => a -> v a -> v a
- intercalate :: Vec v a => v a -> [v a] -> v a
- intercalateElem :: forall v a. Vec v a => a -> [v a] -> v a
- transpose :: Vec v a => [v a] -> [v a]
- zipWith' :: forall v a u b w c. (Vec v a, Vec u b, Vec w c) => (a -> b -> c) -> v a -> u b -> w c
- unzipWith' :: forall v a u b w c. (Vec v a, Vec u b, Vec w c) => (a -> (b, c)) -> v a -> (u b, w c)
- scanl' :: forall v u a b. (Vec v a, Vec u b) => (b -> a -> b) -> b -> v a -> u b
- scanl1' :: forall v a. Vec v a => (a -> a -> a) -> v a -> v a
- scanr' :: forall v u a b. (Vec v a, Vec u b) => (a -> b -> b) -> b -> v a -> u b
- scanr1' :: forall v a. Vec v a => (a -> a -> a) -> v a -> v a
- rangeCut :: Int -> Int -> Int -> Int
- head :: (Vec v a, HasCallStack) => v a -> a
- tail :: (Vec v a, HasCallStack) => v a -> v a
- init :: (Vec v a, HasCallStack) => v a -> v a
- last :: (Vec v a, HasCallStack) => v a -> a
- index :: (Vec v a, HasCallStack) => v a -> Int -> a
- indexM :: (Vec v a, Monad m, HasCallStack) => v a -> Int -> m a
- unsafeHead :: Vec v a => v a -> a
- unsafeTail :: Vec v a => v a -> v a
- unsafeInit :: Vec v a => v a -> v a
- unsafeLast :: Vec v a => v a -> a
- unsafeIndex :: Vec v a => v a -> Int -> a
- unsafeIndexM :: (Vec v a, Monad m) => v a -> Int -> m a
- unsafeTake :: Vec v a => Int -> v a -> v a
- unsafeDrop :: Vec v a => Int -> v a -> v a

# Slice manipulation

cons :: Vec v a => a -> v a -> v a Source #

*O(n)* `cons`

is analogous to (:) for lists, but of different
complexity, as it requires making a copy.

uncons :: Vec v a => v a -> Maybe (a, v a) Source #

*O(1)* Extract the head and tail of a vector, return `Nothing`

if it is empty.

unsnoc :: Vec v a => v a -> Maybe (v a, a) Source #

*O(1)* Extract the init and last of a vector, return `Nothing`

if vector is empty.

tailMayEmpty :: Vec v a => v a -> v a Source #

*O(1)* Extract the elements after the head of a vector.

NOTE: `tailMayEmpty`

return empty vector in the case of an empty vector.

initMayEmpty :: Vec v a => v a -> v a Source #

*O(1)* Extract the elements before of the last one.

NOTE: `initMayEmpty`

return empty vector in the case of an empty vector.

inits :: Vec v a => v a -> [v a] Source #

*O(n)* Return all initial segments of the given vector, empty first.

tails :: Vec v a => v a -> [v a] Source #

*O(n)* Return all final segments of the given vector, whole vector first.

*O(1)* Extract a sub-range vector with give start index and length.

This function is a total function just like 'take*drop', index*length
exceeds range will be ingored, e.g.

slice 1 3 "hello" == "ell" slice -1 -1 "hello" == "" slice -2 2 "hello" == "" slice 2 10 "hello" == "llo"

This holds for all x y: `slice x y vs == drop x . take (x+y) vs`

takeWhile :: Vec v a => (a -> Bool) -> v a -> v a Source #

*O(n)* Applied to a predicate `p`

and a vector `vs`

,
returns the longest prefix (possibly empty) of `vs`

of elements that
satisfy `p`

.

takeWhileR :: Vec v a => (a -> Bool) -> v a -> v a Source #

*O(n)* Applied to a predicate `p`

and a vector `vs`

,
returns the longest suffix (possibly empty) of `vs`

of elements that
satisfy `p`

.

dropWhile :: Vec v a => (a -> Bool) -> v a -> v a Source #

*O(n)* Applied to a predicate `p`

and a vector `vs`

,
returns the suffix (possibly empty) remaining after `takeWhile`

`p vs`

.

dropWhileR :: Vec v a => (a -> Bool) -> v a -> v a Source #

*O(n)* Applied to a predicate `p`

and a vector `vs`

,
returns the prefix (possibly empty) remaining before `takeWhileR`

`p vs`

.

dropAround :: Vec v a => (a -> Bool) -> v a -> v a Source #

*O(n)* `dropAround f = dropWhile f . dropWhileR f`

break :: Vec v a => (a -> Bool) -> v a -> (v a, v a) Source #

*O(n)* Split the vector into the longest prefix of elements that do not satisfy the predicate and the rest without copying.

`break (==x)`

will be rewritten using a `memchr`

.

span :: Vec v a => (a -> Bool) -> v a -> (v a, v a) Source #

*O(n)* Split the vector into the longest prefix of elements that satisfy the predicate and the rest without copying.

`span (/=x)`

will be rewritten using a `memchr`

.

breakOn :: (Vec v a, Eq a) => v a -> v a -> (v a, v a) Source #

Break a vector on a subvector, returning a pair of the part of the vector prior to the match, and the rest of the vector, e.g.

break "wor" "hello, world" = ("hello, ", "world")

*O(n)* The `stripPrefix`

function takes two vectors and returns `Just`

the remainder of the second iff the first is its prefix, and otherwise
`Nothing`

.

stripSuffix :: (Vec v a, Eq (v a)) => v a -> v a -> Maybe (v a) Source #

O(n) The `stripSuffix`

function takes two vectors and returns Just the remainder of the second iff the first is its suffix, and otherwise Nothing.

split :: (Vec v a, Eq a) => a -> v a -> [v a] Source #

*O(n)* Break a vector into pieces separated by the delimiter element
consuming the delimiter. I.e.

split '\n' "a\nb\nd\ne" == ["a","b","d","e"] split 'a' "aXaXaXa" == ["","X","X","X",""] split 'x' "x" == ["",""]

and

intercalate [c] . split c == id split == splitWith . (==)

NOTE, this function behavior different with bytestring's. see #56.

splitWith :: Vec v a => (a -> Bool) -> v a -> [v a] Source #

*O(n)* Splits a vector into components delimited by
separators, where the predicate returns True for a separator element.
The resulting components do not contain the separators. Two adjacent
separators result in an empty component in the output. eg.

splitWith (=='a') "aabbaca" == ["","","bb","c",""] splitWith (=='a') [] == [""]

NOTE, this function behavior different with bytestring's. see #56.

splitOn :: (Vec v a, Eq a) => v a -> v a -> [v a] Source #

*O(m+n)* Break haystack into pieces separated by needle.

Note: An empty needle will essentially split haystack element by element.

Examples:

`>>>`

["a","b","d","e"]`splitOn "\r\n" "a\r\nb\r\nd\r\ne"`

`>>>`

["","X","X","X",""]`splitOn "aaa" "aaaXaaaXaaaXaaa"`

`>>>`

["",""]`splitOn "x" "x"`

and

intercalate s . splitOn s == id splitOn (singleton c) == split (==c)

The `isPrefix`

function returns `True`

if the first argument is a prefix of the second.

isSuffixOf :: forall v a. (Vec v a, Eq (v a)) => v a -> v a -> Bool Source #

*O(n)* The `isSuffixOf`

function takes two vectors and returns `True`

if the first is a suffix of the second.

isInfixOf :: (Vec v a, Eq a) => v a -> v a -> Bool Source #

Check whether one vector is a subvector of another.

`needle `

.`isInfixOf`

haystack === null haystack || indices needle haystake /= []

commonPrefix :: (Vec v a, Eq a) => v a -> v a -> (v a, v a, v a) Source #

*O(n)* Find the longest non-empty common prefix of two strings
and return it, along with the suffixes of each string at which they
no longer match. e.g.

`>>>`

("foo","bar","quux")`commonPrefix "foobar" "fooquux"`

`>>>`

("","veeble","fetzer")`commonPrefix "veeble" "fetzer"`

words :: Bytes -> [Bytes] Source #

*O(n)* Breaks a `Bytes`

up into a list of words, delimited by ascii space.

lines :: Bytes -> [Bytes] Source #

*O(n)* Breaks a `Bytes`

up into a list of lines, delimited by ascii `n`

.

unlines :: [Bytes] -> Bytes Source #

*O(n)* Joins lines with ascii `n`

.

NOTE: This functions is different from `unlines`

, it DOES NOT add a trailing `n`

.

padLeft :: Vec v a => Int -> a -> v a -> v a Source #

Add padding to the left so that the whole vector's length is at least n.

padRight :: Vec v a => Int -> a -> v a -> v a Source #

Add padding to the right so that the whole vector's length is at least n.

# Transform

reverse :: forall v a. Vec v a => v a -> v a Source #

*O(n)* `reverse`

`vs`

efficiently returns the elements of `xs`

in reverse order.

intersperse :: forall v a. Vec v a => a -> v a -> v a Source #

*O(n)* The `intersperse`

function takes an element and a
vector and `intersperses' that element between the elements of
the vector. It is analogous to the intersperse function on
Lists.

intercalate :: Vec v a => v a -> [v a] -> v a Source #

*O(n)* The `intercalate`

function takes a vector and a list of
vectors and concatenates the list after interspersing the first
argument between each element of the list.

Note: `intercalate`

will force the entire vector list.

intercalateElem :: forall v a. Vec v a => a -> [v a] -> v a Source #

*O(n)* An efficient way to join vector with an element.

transpose :: Vec v a => [v a] -> [v a] Source #

The `transpose`

function transposes the rows and columns of its
vector argument.

# Zipping

zipWith' :: forall v a u b w c. (Vec v a, Vec u b, Vec w c) => (a -> b -> c) -> v a -> u b -> w c Source #

unzipWith' :: forall v a u b w c. (Vec v a, Vec u b, Vec w c) => (a -> (b, c)) -> v a -> (u b, w c) Source #

`unzipWith'`

disassemble a vector with a disassembling function,

The results inside tuple will be evaluated strictly.

# Scans

scanl' :: forall v u a b. (Vec v a, Vec u b) => (b -> a -> b) -> b -> v a -> u b Source #

`scanl'`

is similar to `foldl`

, but returns a list of successive
reduced values from the left.

scanl' f z [x1, x2, ...] == [z, z `f` x1, (z `f` x1) `f` x2, ...]

Note that

lastM (scanl' f z xs) == Just (foldl f z xs).

scanl1' :: forall v a. Vec v a => (a -> a -> a) -> v a -> v a Source #

'scanl1'' is a variant of `scanl`

that has no starting value argument.

scanl1' f [x1, x2, ...] == [x1, x1 `f` x2, ...] scanl1' f [] == []

scanr' :: forall v u a b. (Vec v a, Vec u b) => (a -> b -> b) -> b -> v a -> u b Source #

scanr' is the right-to-left dual of scanl'.

# Misc

rangeCut :: Int -> Int -> Int -> Int Source #

`x' = rangeCut x min max`

limit `x'`

's range to `min`

~ `max`

.

# Unsafe operations

head :: (Vec v a, HasCallStack) => v a -> a Source #

*O(1)* Extract the first element of a vector.

Throw `EmptyVector`

if vector is empty.

tail :: (Vec v a, HasCallStack) => v a -> v a Source #

*O(1)* Extract the elements after the head of a vector.

Throw `EmptyVector`

if vector is empty.

init :: (Vec v a, HasCallStack) => v a -> v a Source #

*O(1)* Extract the elements before of the last one.

Throw `EmptyVector`

if vector is empty.

last :: (Vec v a, HasCallStack) => v a -> a Source #

*O(1)* Extract the last element of a vector.

Throw `EmptyVector`

if vector is empty.

index :: (Vec v a, HasCallStack) => v a -> Int -> a Source #

*O(1)* Index array element.

Throw `IndexOutOfVectorRange`

if index outside of the vector.

indexM :: (Vec v a, Monad m, HasCallStack) => v a -> Int -> m a Source #

*O(1)* Index array element.

Throw `IndexOutOfVectorRange`

if index outside of the vector.

unsafeHead :: Vec v a => v a -> a Source #

*O(1)* Extract the first element of a vector.

Make sure vector is non-empty, otherwise segmentation fault await!

unsafeTail :: Vec v a => v a -> v a Source #

*O(1)* Extract the elements after the head of a vector.

Make sure vector is non-empty, otherwise segmentation fault await!

unsafeInit :: Vec v a => v a -> v a Source #

*O(1)* Extract the elements before of the last one.

Make sure vector is non-empty, otherwise segmentation fault await!

unsafeLast :: Vec v a => v a -> a Source #

*O(1)* Extract the last element of a vector.

Make sure vector is non-empty, otherwise segmentation fault await!

unsafeIndex :: Vec v a => v a -> Int -> a Source #

*O(1)* Index array element.

Make sure index is in bound, otherwise segmentation fault await!

unsafeIndexM :: (Vec v a, Monad m) => v a -> Int -> m a Source #

*O(1)* Index array element.

Make sure index is in bound, otherwise segmentation fault await!