Data.String.NonEmpty.Internal - purescript-strings - Pursuit (original) (raw)

Package

purescript-strings

Repository

purescript/purescript-strings

While most of the code in this module is safe, this module does export a few partial functions and the NonEmptyString constructor. While the partial functions are obvious from the Partial constraint in their type signature, the NonEmptyString constructor can be overlooked when searching for issues in one's code. See the constructor's documentation for more information.

#fromString Source

fromString :: String -> Maybe NonEmptyString

Creates a NonEmptyString from a String, returning Nothing if the input is empty.

fromString "" = Nothing
fromString "hello" = Just (NES.unsafeFromString "hello")

#appendString Source

appendString :: NonEmptyString -> String -> NonEmptyString

Appends a string to this non-empty string. Since one of the strings is non-empty we know the result will be too.

appendString (NonEmptyString "Hello") " world" == NonEmptyString "Hello world"
appendString (NonEmptyString "Hello") "" == NonEmptyString "Hello"

#prependString Source

prependString :: String -> NonEmptyString -> NonEmptyString

Prepends a string to this non-empty string. Since one of the strings is non-empty we know the result will be too.

prependString "be" (NonEmptyString "fore") == NonEmptyString "before"
prependString "" (NonEmptyString "fore") == NonEmptyString "fore"

#stripPrefix Source

stripPrefix :: Pattern -> NonEmptyString -> Maybe NonEmptyString

If the string starts with the given prefix, return the portion of the string left after removing it. If the prefix does not match or there is no remainder, the result will be Nothing.

stripPrefix (Pattern "http:") (NonEmptyString "http://purescript.org") == Just (NonEmptyString "//purescript.org")
stripPrefix (Pattern "http:") (NonEmptyString "https://purescript.org") == Nothing
stripPrefix (Pattern "Hello!") (NonEmptyString "Hello!") == Nothing

#stripSuffix Source

stripSuffix :: Pattern -> NonEmptyString -> Maybe NonEmptyString

If the string ends with the given suffix, return the portion of the string left after removing it. If the suffix does not match or there is no remainder, the result will be Nothing.

stripSuffix (Pattern ".exe") (NonEmptyString "purs.exe") == Just (NonEmptyString "purs")
stripSuffix (Pattern ".exe") (NonEmptyString "purs") == Nothing
stripSuffix (Pattern "Hello!") (NonEmptyString "Hello!") == Nothing

#contains Source

contains :: Pattern -> NonEmptyString -> Boolean

Checks whether the pattern appears in the given string.

contains (Pattern "needle") (NonEmptyString "haystack with needle") == true
contains (Pattern "needle") (NonEmptyString "haystack") == false

#localeCompare Source

localeCompare :: NonEmptyString -> NonEmptyString -> Ordering

Compare two strings in a locale-aware fashion. This is in contrast to the Ord instance on String which treats strings as arrays of code units:

NonEmptyString "ä" `localeCompare` NonEmptyString "b" == LT
NonEmptyString "ä" `compare` NonEmptyString "b" == GT

#joinWith Source

joinWith :: forall f. Foldable f => String -> f NonEmptyString -> String

Joins the strings in a container together as a new string, inserting the first argument as separator between them. The result is not guaranteed to be non-empty.

joinWith ", " [NonEmptyString "apple", NonEmptyString "banana"] == "apple, banana"
joinWith ", " [] == ""

#join1With Source

join1With :: forall f. Foldable1 f => String -> f NonEmptyString -> NonEmptyString

Joins non-empty strings in a non-empty container together as a new non-empty string, inserting a possibly empty string as separator between them. The result is guaranteed to be non-empty.

-- array syntax is used for demonstration here, it would need to be a real `Foldable1`
join1With ", " [NonEmptyString "apple", NonEmptyString "banana"] == NonEmptyString "apple, banana"
join1With "" [NonEmptyString "apple", NonEmptyString "banana"] == NonEmptyString "applebanana"

#joinWith1 Source

joinWith1 :: forall f. Foldable1 f => NonEmptyString -> f String -> NonEmptyString

Joins possibly empty strings in a non-empty container together as a new non-empty string, inserting a non-empty string as a separator between them. The result is guaranteed to be non-empty.

-- array syntax is used for demonstration here, it would need to be a real `Foldable1`
joinWith1 (NonEmptyString ", ") ["apple", "banana"] == NonEmptyString "apple, banana"
joinWith1 (NonEmptyString "/") ["a", "b", "", "c", ""] == NonEmptyString "a/b//c/"