Copyright | (c) Andrey Mulik 2020 |
---|---|
License | BSD-style |
Maintainer | work.a.mulik@gmail.com |
Portability | non-portable (GHC only) |
Safe Haskell | Trustworthy |
Language | Haskell2010 |
Exports
module System.IO.Classes
module SDP.IndexedM
Strict text
A space efficient, packed, unboxed Unicode text type.
Instances
toCaseFold :: Text -> Text #
O(n) Convert a string to folded case. Subject to fusion.
This function is mainly useful for performing caseless (also known as case insensitive) string comparisons.
A string x
is a caseless match for a string y
if and only if:
toCaseFold x == toCaseFold y
The result string may be longer than the input string, and may
differ from applying toLower
to the input string. For instance,
the Armenian small ligature "ﬓ" (men now, U+FB13) is case
folded to the sequence "մ" (men, U+0574) followed by
"ն" (now, U+0576), while the Greek "µ" (micro sign,
U+00B5) is case folded to "μ" (small letter mu, U+03BC)
instead of itself.
O(n) Convert a string to lower case, using simple case conversion. Subject to fusion.
The result string may be longer than the input string. For instance, "İ" (Latin capital letter I with dot above, U+0130) maps to the sequence "i" (Latin small letter i, U+0069) followed by " ̇" (combining dot above, U+0307).
O(n) Convert a string to upper case, using simple case conversion. Subject to fusion.
The result string may be longer than the input string. For instance, the German "ß" (eszett, U+00DF) maps to the two-letter sequence "SS".
O(n) Convert a string to title case, using simple case conversion. Subject to fusion.
The first letter of the input is converted to title case, as is every subsequent letter that immediately follows a non-letter. Every letter that immediately follows another letter is converted to lower case.
The result string may be longer than the input string. For example, the Latin small ligature fl (U+FB02) is converted to the sequence Latin capital letter F (U+0046) followed by Latin small letter l (U+006C).
Note: this function does not take language or culture specific rules into account. For instance, in English, different style guides disagree on whether the book name "The Hill of the Red Fox" is correctly title cased—but this function will capitalize every word.
Since: text-1.0.0.0