Unicode.Char.General

unicode-data-0.4.0.1: Access Unicode Character Database (UCD)

Copyright | (c) 2020 Composewell Technologies and Contributors
License | Apache-2.0
Maintainer | streamly@composewell.com
Stability | experimental
Safe Haskell | None
Language | Haskell2010

Unicode.Char.General

Contents

- Unicode general categories
- Character classification
  - Re-export
- Korean Hangul Characters
  - Conjoining Jamo
    - Jamo Leading (L)
    - Jamo Vowel (V)
    - Jamo Trailing (T)
  - Hangul Syllables

Description

General character property related functions.

Synopsis

- data GeneralCategory
  - = UppercaseLetter
  - | LowercaseLetter
  - | TitlecaseLetter
  - | ModifierLetter
  - | OtherLetter
  - | NonSpacingMark
  - | SpacingCombiningMark
  - | EnclosingMark
  - | DecimalNumber
  - | LetterNumber
  - | OtherNumber
  - | ConnectorPunctuation
  - | DashPunctuation
  - | OpenPunctuation
  - | ClosePunctuation
  - | InitialQuote
  - | FinalQuote
  - | OtherPunctuation
  - | MathSymbol
  - | CurrencySymbol
  - | ModifierSymbol
  - | OtherSymbol
  - | Space
  - | LineSeparator
  - | ParagraphSeparator
  - | Control
  - | Format
  - | Surrogate
  - | PrivateUse
  - | NotAssigned
- generalCategoryAbbr :: GeneralCategory -> String
- generalCategory :: Char -> GeneralCategory
- isAlphabetic :: Char -> Bool
- isAlphaNum :: Char -> Bool
- isControl :: Char -> Bool
- isMark :: Char -> Bool
- isPrint :: Char -> Bool
- isPunctuation :: Char -> Bool
- isSeparator :: Char -> Bool
- isSymbol :: Char -> Bool
- isWhiteSpace :: Char -> Bool
- isLetter :: Char -> Bool
- isSpace :: Char -> Bool
- isAscii :: Char -> Bool
- isLatin1 :: Char -> Bool
- isAsciiUpper :: Char -> Bool
- isAsciiLower :: Char -> Bool
- isJamo :: Char -> Bool
- jamoNCount :: Int
- jamoLFirst :: Int
- jamoLCount :: Int
- jamoLIndex :: Char -> Maybe Int
- jamoLLast :: Int
- jamoVFirst :: Int
- jamoVCount :: Int
- jamoVIndex :: Char -> Maybe Int
- jamoVLast :: Int
- jamoTFirst :: Int
- jamoTCount :: Int
- jamoTIndex :: Char -> Maybe Int
- jamoTLast :: Int
- hangulFirst :: Int
- hangulLast :: Int
- isHangul :: Char -> Bool
- isHangulLV :: Char -> Bool

# Unicode general categories

data GeneralCategory #

Unicode General Categories.

These classes are defined in the Unicode Character Database, part of the Unicode standard

Note: the classes must be in the same order they are listed in the Unicode Standard, because some functions (e.g. `generalCategory`) rely on the `Enum` instance.

Since: 0.3.0

Constructors

UppercaseLetter | `Lu`: Letter, Uppercase
LowercaseLetter | `Ll`: Letter, Lowercase
TitlecaseLetter | `Lt`: Letter, Titlecase
ModifierLetter | `Lm`: Letter, Modifier
OtherLetter | `Lo`: Letter, Other
NonSpacingMark | `Mn`: Mark, Non-Spacing
SpacingCombiningMark | `Mc`: Mark, Spacing Combining
EnclosingMark | `Me`: Mark, Enclosing
DecimalNumber | `Nd`: Number, Decimal
LetterNumber | `Nl`: Number, Letter
OtherNumber | `No`: Number, Other
ConnectorPunctuation | `Pc`: Punctuation, Connector
DashPunctuation | `Pd`: Punctuation, Dash
OpenPunctuation | `Ps`: Punctuation, Open
ClosePunctuation | `Pe`: Punctuation, Close
InitialQuote | `Pi`: Punctuation, Initial quote
FinalQuote | `Pf`: Punctuation, Final quote
OtherPunctuation | `Po`: Punctuation, Other
MathSymbol | `Sm`: Symbol, Math
CurrencySymbol | `Sc`: Symbol, Currency
ModifierSymbol | `Sk`: Symbol, Modifier
OtherSymbol | `So`: Symbol, Other
Space | `Zs`: Separator, Space
LineSeparator | `Zl`: Separator, Line
ParagraphSeparator | `Zp`: Separator, Paragraph
Control | `Cc`: Other, Control
Format | `Cf`: Other, Format
Surrogate | `Cs`: Other, Surrogate
PrivateUse | `Co`: Other, Private Use
NotAssigned | `Cn`: Other, Not Assigned

#### Instances

Instances details

Bounded GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods minBound :: GeneralCategory # maxBound :: GeneralCategory #
Enum GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods succ :: GeneralCategory -> GeneralCategory # pred :: GeneralCategory -> GeneralCategory # toEnum :: Int -> GeneralCategory # fromEnum :: GeneralCategory -> Int # enumFrom :: GeneralCategory -> [GeneralCategory] # enumFromThen :: GeneralCategory -> GeneralCategory -> [GeneralCategory] # enumFromTo :: GeneralCategory -> GeneralCategory -> [GeneralCategory] # enumFromThenTo :: GeneralCategory -> GeneralCategory -> GeneralCategory -> [GeneralCategory] #
Ix GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods range :: (GeneralCategory, GeneralCategory) -> [GeneralCategory] # index :: (GeneralCategory, GeneralCategory) -> GeneralCategory -> Int # unsafeIndex :: (GeneralCategory, GeneralCategory) -> GeneralCategory -> Int # inRange :: (GeneralCategory, GeneralCategory) -> GeneralCategory -> Bool # rangeSize :: (GeneralCategory, GeneralCategory) -> Int # unsafeRangeSize :: (GeneralCategory, GeneralCategory) -> Int #
Show GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods showsPrec :: Int -> GeneralCategory -> ShowS # show :: GeneralCategory -> String # showList :: [GeneralCategory] -> ShowS #
Eq GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods (==) :: GeneralCategory -> GeneralCategory -> Bool # (/=) :: GeneralCategory -> GeneralCategory -> Bool #
Ord GeneralCategory # |
Instance details Defined in Unicode.Char.General Methods compare :: GeneralCategory -> GeneralCategory -> Ordering # (<) :: GeneralCategory -> GeneralCategory -> Bool # (<=) :: GeneralCategory -> GeneralCategory -> Bool # (>) :: GeneralCategory -> GeneralCategory -> Bool # (>=) :: GeneralCategory -> GeneralCategory -> Bool # max :: GeneralCategory -> GeneralCategory -> GeneralCategory # min :: GeneralCategory -> GeneralCategory -> GeneralCategory #

generalCategoryAbbr :: GeneralCategory -> String #

Abbreviation of `GeneralCategory` used in the Unicode standard.

Since: 0.3.0

generalCategory :: Char -> GeneralCategory #

The Unicode general category of the character.

This property is defined in the column 2 of the `UnicodeData` table.

This relies on the `Enum` instance of `GeneralCategory`, which must remain in the same order as the categories are presented in the Unicode standard.

    show (generalCategory c) == show (Data.Char.generalCategory c)

Since: 0.3.0

# Character classification

isAlphabetic :: Char -> Bool #

Returns `True` for alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters).

Note: this function is not equivalent to `isAlpha` / `isLetter`:

- `isAlpha` matches the following general categories:

  - `UppercaseLetter` (`Lu`)
  - `LowercaseLetter` (`Ll`)
  - `TitlecaseLetter` (`Lt`)
  - `ModifierLetter` (`Lm`)
  - `OtherLetter` (`Lo`)

- whereas `isAlphabetic` matches:

  - `Uppercase` property
  - `Lowercase` property
  - `TitlecaseLetter` (`Lt`)
  - `ModifierLetter` (`Lm`)
  - `OtherLetter` (`Lo`)
  - `LetterNumber` (`Nl`)
  - `Other_Alphabetic` property

Since: 0.3.0

isAlphaNum :: Char -> Bool #

Selects alphabetic or numeric Unicode characters.

This function returns `True` if its argument has one of the following `GeneralCategory`s, or `False` otherwise:

- `UppercaseLetter`
- `LowercaseLetter`
- `TitlecaseLetter`
- `ModifierLetter`
- `OtherLetter`
- `DecimalNumber`
- `LetterNumber`
- `OtherNumber`

    isAlphaNum c == Data.Char.isAlphaNum c

Since: 0.3.0

isControl :: Char -> Bool #

Selects control characters, which are the non-printing characters of the Latin-1 subset of Unicode.

This function returns `True` if its argument has the `GeneralCategory` `Control`.

    isControl c == Data.Char.isControl c

Since: 0.3.0

isMark :: Char -> Bool #

Selects Unicode mark characters, for example accents and the like, which combine with preceding characters.

This function returns `True` if its argument has one of the following `GeneralCategory`s, or `False` otherwise:

- `NonSpacingMark`
- `SpacingCombiningMark`
- `EnclosingMark`

    isMark c == Data.Char.isMark c

Since: 0.3.0

isPrint :: Char -> Bool #

Selects printable Unicode characters (letters, numbers, marks, punctuation, symbols and spaces).

This function returns `False` if its argument has one of the following `GeneralCategory`s, or `True` otherwise:

- `LineSeparator`
- `ParagraphSeparator`
- `Control`
- `Format`
- `Surrogate`
- `PrivateUse`
- `NotAssigned`

    isPrint c == Data.Char.isPrint c

Since: 0.3.0

isPunctuation :: Char -> Bool #

Selects Unicode punctuation characters, including various kinds of connectors, brackets and quotes.

This function returns `True` if its argument has one of the following `GeneralCategory`s, or `False` otherwise:

- `ConnectorPunctuation`
- `DashPunctuation`
- `OpenPunctuation`
- `ClosePunctuation`
- `InitialQuote`
- `FinalQuote`
- `OtherPunctuation`

    isPunctuation c == Data.Char.isPunctuation c

Since: 0.3.0

isSeparator :: Char -> Bool #

Selects Unicode space and separator characters.

This function returns `True` if its argument has one of the following `GeneralCategory`s, or `False` otherwise:

- `Space`
- `LineSeparator`
- `ParagraphSeparator`

    isSeparator c == Data.Char.isSeparator c

Since: 0.3.0

isSymbol :: Char -> Bool #

Selects Unicode symbol characters, including mathematical and currency symbols.

This function returns `True` if its argument has one of the following `GeneralCategory`s, or `False` otherwise: * `MathSymbol` * `CurrencySymbol` * `ModifierSymbol` * `OtherSymbol`

    isSymbol c == Data.Char.isSymbol c

Since: 0.3.0

isWhiteSpace :: Char -> Bool #

Returns `True` for any whitespace characters, and the control characters `\t`, `\n`, `\r`, `\f`, `\v`.

See: Unicode `White_Space`.

Note: `isWhiteSpace` is not equivalent to `isSpace`. `isWhiteSpace` selects the same characters from `isSpace` plus the following:

- `U+0085` NEXT LINE (NEL)
- `U+2028` LINE SEPARATOR
- `U+2029` PARAGRAPH SEPARATOR

Since: 0.3.0

isLetter :: Char -> Bool #

Deprecated: Use isAlphabetic instead. Note that the behavior of this function does not match base:Data.Char.isLetter. See Unicode.Char.General.Compat for behavior compatible with base:Data.Char.

Returns `True` for alphabetic Unicode characters (lower-case, upper-case and title-case letters, plus letters of caseless scripts and modifiers letters).

Since: 0.1.0

isSpace :: Char -> Bool #

Deprecated: Use isWhiteSpace instead. Note that the behavior of this function does not match base:Data.Char.isSpace. See Unicode.Char.General.Compat for behavior compatible with base:Data.Char.

Returns `True` for any whitespace characters, and the control characters `\t`, `\n`, `\r`, `\f`, `\v`.

Since: 0.1.0

## Re-export

isAscii :: Char -> Bool #

Selects the first 128 characters of the Unicode character set, corresponding to the ASCII character set.

isLatin1 :: Char -> Bool #

Selects the first 256 characters of the Unicode character set, corresponding to the ISO 8859-1 (Latin-1) character set.

isAsciiUpper :: Char -> Bool #

Selects ASCII upper-case letters, i.e. characters satisfying both `isAscii` and `isUpper`.

isAsciiLower :: Char -> Bool #

Selects ASCII lower-case letters, i.e. characters satisfying both `isAscii` and `isLower`.

# Korean Hangul Characters

The Hangul script used in the Korean writing system consists of individual consonant and vowel letters (jamo) that are visually combined into square display cells to form entire syllable blocks. Hangul syllables may be encoded directly as precomposed combinations of individual jamo or as decomposed sequences of conjoining jamo. Modern Hangul syllable blocks can be expressed with either two or three jamo, either in the form consonant + vowel or in the form consonant + vowel + consonant. The leading consonant is represented as L, the vowel as V and the trailing consonant as T.

The Unicode Standard contains both a large set of precomposed modern Hangul syllables and a set of conjoining Hangul jamo, which can be used to encode archaic Korean syllable blocks as well as modern Korean syllable blocks.

Hangul characters can be composed or decomposed algorithmically instead of via mappings. These APIs are used mainly for Unicode normalization of Hangul text.

Please refer to the following resources for more information:

- The `Hangul` section of the `East Asia` chapter of the Unicode Standard
- Conformance chapter of the Unicode Standard
- Unicode® Standard Annex #15 - Unicode Normalization Forms
- UCD file `HangulSyllableType.txt`
- https://en.wikipedia.org/wiki/Hangul_Jamo_(Unicode_block)
- https://en.wikipedia.org/wiki/List_of_Hangul_jamo

## Conjoining Jamo

Jamo L, V and T letters.

isJamo :: Char -> Bool #

Determine whether a character is a jamo L, V or T character.

Since: 0.1.0

jamoNCount :: Int #

Total count of all jamo characters.

    jamoNCount = jamoVCount * jamoTCount

Since: 0.1.0

### Jamo Leading (L)

jamoLFirst :: Int #

First leading consonant jamo.

Since: 0.1.0

jamoLCount :: Int #

Total count of leading consonant jamo.

Since: 0.3.0

jamoLIndex :: Char -> Maybe Int #

Given a Unicode character, if it is a leading jamo, return its index in the list of leading jamo consonants, otherwise return `Nothing`.

Since: 0.1.0

jamoLLast :: Int #

Last leading consonant jamo.

Since: 0.1.0

### Jamo Vowel (V)

jamoVFirst :: Int #

First vowel jamo.

Since: 0.1.0

jamoVCount :: Int #

Total count of vowel jamo.

Since: 0.1.0

jamoVIndex :: Char -> Maybe Int #

Given a Unicode character, if it is a vowel jamo, return its index in the list of vowel jamo, otherwise return `Nothing`.

Since: 0.1.0

jamoVLast :: Int #

Last vowel jamo.

Since: 0.1.0

### Jamo Trailing (T)

jamoTFirst :: Int #

The first trailing consonant jamo.

Note that `jamoTFirst` does not represent a valid T, it represents a missing T i.e. LV without a T. See comments under `jamoTIndex` .

Since: 0.1.0

jamoTCount :: Int #

Total count of trailing consonant jamo.

Since: 0.1.0

jamoTIndex :: Char -> Maybe Int #

Given a Unicode character, if it is a trailing jamo consonant, return its index in the list of trailing jamo consonants, otherwise return `Nothing`.

Note that index 0 is not a valid index for a trailing consonant. Index 0 corresponds to an LV syllable, without a T. See "Hangul Syllable Decomposition" in the Conformance chapter of the Unicode standard for more details.

Since: 0.1.0

jamoTLast :: Int #

Last trailing consonant jamo.

Since: 0.1.0

## Hangul Syllables

Precomposed Hangul syllables.

hangulFirst :: Int #

Codepoint of the first pre-composed Hangul character.

Since: 0.1.0

hangulLast :: Int #

Codepoint of the last Hangul character.

Since: 0.1.0

isHangul :: Char -> Bool #

Determine if the given character is a precomposed Hangul syllable.

Since: 0.1.0

isHangulLV :: Char -> Bool #

Determine if the given character is a Hangul LV syllable.

Note: this function requires a precomposed Hangul syllable but does not check it. Use `isHangul` to check the input character before passing it to `isHangulLV`.

Since: 0.1.0