| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
Data.Textual.Fractional
Description
Parsers for fractions.
- class PositionalSystem s where
- systemName :: s -> String
- radixIn :: Num α => s -> α
- isDigitIn :: s -> Char -> Bool
- isNzDigitIn :: s -> Char -> Bool
- fromDigitIn :: Num α => s -> Char -> Maybe α
- fromNzDigitIn :: Num α => s -> Char -> Maybe α
- unsafeFromDigitIn :: Num α => s -> Char -> α
- intToDigitIn :: s -> Int -> Char
- printDigitIn :: Printer p => s -> Char -> p
- printZeroIn :: Printer p => s -> p
- data Binary :: * = Binary
- data Octal :: * = Octal
- data Decimal :: * = Decimal
- data Hexadecimal :: * = Hexadecimal
- data UpHex :: * = UpHex
- data LowHex :: * = LowHex
- data Sign
- applySign :: Num α => Sign -> α -> α
- optMinus :: CharParsing μ => μ Sign
- optSign :: CharParsing μ => μ Sign
- data Optional :: *
- isOptional :: Optional -> Bool
- isRequired :: Optional -> Bool
- optSlash :: (Monad μ, CharParsing μ) => μ Optional
- fraction' :: (PositionalSystem s, Fractional α, Monad μ, CharParsing μ) => μ Sign -> s -> μ Optional -> μ α
- fraction :: (Fractional α, Monad μ, CharParsing μ) => μ α
- decExpSign :: (Monad μ, CharParsing μ) => μ (Maybe Sign)
- hexExpSign :: (Monad μ, CharParsing μ) => μ (Maybe Sign)
- fractional' :: (PositionalSystem s, Fractional α, Monad μ, CharParsing μ) => μ Sign -> s -> Optional -> μ () -> μ (Maybe Sign) -> μ α
- fractional :: (Monad μ, Fractional α, CharParsing μ) => μ α
Positional numeral systems
class PositionalSystem s where #
Positional numeral system.
Minimal complete definition
systemName, radixIn, isDigitIn, isNzDigitIn, fromDigitIn, fromNzDigitIn, unsafeFromDigitIn, intToDigitIn
The binary numeral system.
Constructors
| Binary |
The octal numeral system.
Constructors
| Octal |
The decimal numeral system.
Constructors
| Decimal |
The hexadecimal numeral system, using upper case digits.
Constructors
| UpHex |
The hexadecimal numeral system, using lower case digits.
Constructors
| LowHex |
Sign
Sign of a number.
Constructors
| NonNegative | |
| NonPositive |
applySign :: Num α => Sign -> α -> α #
Negate the supplied value if the sign is NonPositive and return it
as it is otherwise.
optMinus :: CharParsing μ => μ Sign #
Optional minus sign.
optSign :: CharParsing μ => μ Sign #
Optional minus or plus sign.
Optionality characteristic
Optionality characteristic.
isOptional :: Optional -> Bool #
True if the supplied value is Optional and false otherwise.
isRequired :: Optional -> Bool #
True if the supplied value is Required and false otherwise.
Fraction parsers
optSlash :: (Monad μ, CharParsing μ) => μ Optional #
Arguments
| :: (PositionalSystem s, Fractional α, Monad μ, CharParsing μ) | |
| => μ Sign | Sign parser |
| -> s | |
| -> μ Optional | Numerator/denominator separator parser |
| -> μ α |
Parse a fraction. The numerator and the denominator are expected to be written in the specified positional numeral system.
fraction :: (Fractional α, Monad μ, CharParsing μ) => μ α #
s-fraction parsers
decExpSign :: (Monad μ, CharParsing μ) => μ (Maybe Sign) #
Start of a decimal exponent. Accepts e or E followed by
an optional sign. Otherwise Nothing is returned.
hexExpSign :: (Monad μ, CharParsing μ) => μ (Maybe Sign) #
Start of a hexadecimal exponent. Accepts p or P followed by
an optional sign. Otherwise Nothing is returned.
Arguments
| :: (PositionalSystem s, Fractional α, Monad μ, CharParsing μ) | |
| => μ Sign | Sign parser. |
| -> s | |
| -> Optional | Whether the integer part is optional. |
| -> μ () | Dot parser. |
| -> μ (Maybe Sign) | Exponent start parser. |
| -> μ α |
s-fraction parser.
fractional :: (Monad μ, Fractional α, CharParsing μ) => μ α #
Decimal fraction parser.