Unicode.Char.Normalization

Low level Unicode database functions to facilitate Unicode normalization.

For more information on Unicode normalization please refer to the following sections of the Unicode standard:

• 2 General Structure

  • 2.3 Compatibility Characters
  • 2.12 Equivalent Sequences

• 3 Conformance

  • 3.6 Combination
  • 3.7 Decomposition
  • 3.11 Normalization Forms
  • 3.12 Conjoining Jamo Behavior

• 4 Character Properties

  • 4.3 Combining Classes
• Unicode® Standard Annex #15 - Unicode Normalization Forms
• Unicode® Standard Annex #44 - Unicode Character Database

Combining class

isCombining :: Char -> Bool

Returns True if a character is a combining character.

combiningClass :: Char -> Int

Returns the combining class of a character.

isCombiningStarter :: Char -> Bool

Return True if a starter character may combine with some preceding starter character.

Composition

compose :: Char -> Char -> Maybe Char

Compose a starter character (combining class 0) with a combining character (non-zero combining class). Returns the composed character if the starter combines with the combining character, returns Nothing otherwise.

composeStarters :: Char -> Char -> Maybe Char

Compose a starter character with another starter character. Returns the composed character if the two starters combine, returns Nothing otherwise.

Decomposition

Non-Hangul

data DecomposeMode

Whether we are decomposing in canonical or compatibility mode.

Constructors

Canonical

Kompat

isDecomposable :: DecomposeMode -> Char -> Bool

Given a non-Hangul character determine if the character is decomposable. Note that in case compatibility decompositions a character may decompose into a single compatibility character.

decompose :: DecomposeMode -> Char -> [Char]

Decompose a non-Hangul character into its canonical or compatibility decompositions. Note that the resulting characters may further decompose.

Hangul

decomposeHangul :: Char -> (Char, Char, Char)

Decompose a Hangul syllable into its corresponding Jamo characters.