Safe Haskell	None
Language	Haskell2010

PyF.Internal.PythonSyntax

Description

This module provides a parser for python format string mini language.

Synopsis

parsePythonFormatString :: Parser [Item]
data Item
- = Raw String
- | Replacement String (Maybe FormatMode)
data FormatMode = FormatMode Padding TypeFormat (Maybe Char)
data Padding
- = PaddingDefault
- | Padding Integer (Maybe (Maybe Char, AnyAlign))
data Precision
- = PrecisionDefault
- | Precision Integer
data TypeFormat
data AlternateForm
- = AlternateForm
- | NormalForm
pattern DefaultFormatMode :: FormatMode

Documentation

parsePythonFormatString :: Parser [Item] Source #

Parse a string, returns a list of raw string or replacement fields

>>> import Text.Megaparsec
>>> parse parsePythonFormatString "" "hello {1+1:>10.2f}"
Right [
       Raw "hello ",
       Replacement "1+1"
       (
       Just (FormatMode
                      (Padding 10 (Just (Nothing,AnyAlign AlignRight)))
                      (FixedF (Precision 2) NormalForm Minus)
                       Nothing))]

data Item Source #

A format string is composed of many chunks of raw string or replacement

Constructors

Raw String	A raw string
Replacement String (Maybe FormatMode)	A replacement string, composed of an arbitrary Haskell expression followed by an optional formatter

Instances

Show Item Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> Item -> ShowS # show :: Item -> String # showList :: [Item] -> ShowS #

data FormatMode Source #

A Formatter, listing padding, format and and grouping char

Constructors

FormatMode Padding TypeFormat (Maybe Char)

Instances

Show FormatMode Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> FormatMode -> ShowS # show :: FormatMode -> String # showList :: [FormatMode] -> ShowS #

data Padding Source #

Padding, containing the padding width, the padding char and the alignement mode

Constructors

PaddingDefault
Padding Integer (Maybe (Maybe Char, AnyAlign))

Instances

Show Padding Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> Padding -> ShowS # show :: Padding -> String # showList :: [Padding] -> ShowS #
Lift Padding Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods lift :: Padding -> Q Exp #

data Precision Source #

Floating point precision

Constructors

PrecisionDefault
Precision Integer

Instances

Show Precision Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> Precision -> ShowS # show :: Precision -> String # showList :: [Precision] -> ShowS #
Lift Precision Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods lift :: Precision -> Q Exp #

data TypeFormat Source #

All formating type

Constructors

DefaultF Precision SignMode	Default, depends on the infered type of the expression
BinaryF AlternateForm SignMode	Binary, such as `0b0121`
CharacterF	Character, will convert an integer to its character representation
DecimalF SignMode	Decimal, base 10 integer formatting
ExponentialF Precision AlternateForm SignMode	Exponential notation for floatting points
ExponentialCapsF Precision AlternateForm SignMode	Exponential notation with capitalised `e`
FixedF Precision AlternateForm SignMode	Fixed number of digits floating point
FixedCapsF Precision AlternateForm SignMode	Capitalized version of the previous
GeneralF Precision AlternateForm SignMode	General formatting: `FixedF` or `ExponentialF` depending on the number magnitude
GeneralCapsF Precision AlternateForm SignMode	Same as `GeneralF` but with upper case `E` and infinite / NaN
OctalF AlternateForm SignMode	Octal, such as 00245
StringF Precision	Simple string
HexF AlternateForm SignMode	Hexadecimal, such as 0xaf3e
HexCapsF AlternateForm SignMode	Hexadecimal with capitalized letters, such as 0XAF3E
PercentF Precision AlternateForm SignMode	Percent representation

Instances

Show TypeFormat Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> TypeFormat -> ShowS # show :: TypeFormat -> String # showList :: [TypeFormat] -> ShowS #

data AlternateForm Source #

If the formatter use its alternate form

Constructors

AlternateForm
NormalForm

Instances

Show AlternateForm Source #
Instance details Defined in PyF.Internal.PythonSyntax Methods showsPrec :: Int -> AlternateForm -> ShowS # show :: AlternateForm -> String # showList :: [AlternateForm] -> ShowS #

pattern DefaultFormatMode :: FormatMode Source #

Default formating mode, no padding, default precision, no grouping, no sign handling