Safe Haskell	None
Language	Haskell2010

Data.Loc.Pos

Contents

Show and Read

Synopsis

data Pos
data Line
data Column
class ToNat a where
- toNat :: a -> Natural
posShowsPrec :: Int -> Pos -> ShowS
posReadPrec :: ReadPrec Pos

Documentation

data Pos Source #

Pos stands for positive integer. You can also think of it as position, because we use it to represent line and column numbers (Line and Column).

Pos has instances of several of the standard numeric typeclasses, although many of the operations throw Underflow when non-positive values result. Pos does not have an Integral instance, because there is no sensible way to implement quotRem.

Instances

Enum Pos Source #	`>>>` `toEnum 3 :: Pos`3 `>>>` `toEnum 0 :: Pos`* Exception: arithmetic underflow `>>>` `fromEnum (3 :: Pos)`**3
Instance details Defined in Data.Loc.Pos Methods succ :: Pos -> Pos # pred :: Pos -> Pos # toEnum :: Int -> Pos # fromEnum :: Pos -> Int # enumFrom :: Pos -> [Pos] # enumFromThen :: Pos -> Pos -> [Pos] # enumFromTo :: Pos -> Pos -> [Pos] # enumFromThenTo :: Pos -> Pos -> Pos -> [Pos] #
Eq Pos Source #
Instance details Defined in Data.Loc.Pos Methods (==) :: Pos -> Pos -> Bool # (/=) :: Pos -> Pos -> Bool #
Num Pos Source #	`>>>` `fromInteger 3 :: Pos`3 `>>>` `fromInteger 0 :: Pos`* Exception: arithmetic underflow `>>>` `2 + 3 :: Pos`5 `>>>` `3 - 2 :: Pos`1 `>>>` `3 - 3 :: Pos`*** Exception: arithmetic underflow `>>>` `2 * 3 :: Pos`6 `>>>` `negate 3 :: Pos`***** Exception: arithmetic underflow
Instance details Defined in Data.Loc.Pos Methods (+) :: Pos -> Pos -> Pos # (-) :: Pos -> Pos -> Pos # (*) :: Pos -> Pos -> Pos # negate :: Pos -> Pos # abs :: Pos -> Pos # signum :: Pos -> Pos # fromInteger :: Integer -> Pos #
Ord Pos Source #
Instance details Defined in Data.Loc.Pos Methods compare :: Pos -> Pos -> Ordering # (<) :: Pos -> Pos -> Bool # (<=) :: Pos -> Pos -> Bool # (>) :: Pos -> Pos -> Bool # (>=) :: Pos -> Pos -> Bool # max :: Pos -> Pos -> Pos # min :: Pos -> Pos -> Pos #
Read Pos Source #
Instance details Defined in Data.Loc.Pos Methods readsPrec :: Int -> ReadS Pos # readList :: ReadS [Pos] # readPrec :: ReadPrec Pos # readListPrec :: ReadPrec [Pos] #
Real Pos Source #
Instance details Defined in Data.Loc.Pos Methods toRational :: Pos -> Rational #
Show Pos Source #
Instance details Defined in Data.Loc.Pos Methods showsPrec :: Int -> Pos -> ShowS # show :: Pos -> String # showList :: [Pos] -> ShowS #
ToNat Pos Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Pos -> Natural Source #

data Line Source #

Instances

Enum Line Source #
Instance details Defined in Data.Loc.Pos Methods succ :: Line -> Line # pred :: Line -> Line # toEnum :: Int -> Line # fromEnum :: Line -> Int # enumFrom :: Line -> [Line] # enumFromThen :: Line -> Line -> [Line] # enumFromTo :: Line -> Line -> [Line] # enumFromThenTo :: Line -> Line -> Line -> [Line] #
Eq Line Source #
Instance details Defined in Data.Loc.Pos Methods (==) :: Line -> Line -> Bool # (/=) :: Line -> Line -> Bool #
Num Line Source #
Instance details Defined in Data.Loc.Pos Methods (+) :: Line -> Line -> Line # (-) :: Line -> Line -> Line # (*) :: Line -> Line -> Line # negate :: Line -> Line # abs :: Line -> Line # signum :: Line -> Line # fromInteger :: Integer -> Line #
Ord Line Source #
Instance details Defined in Data.Loc.Pos Methods compare :: Line -> Line -> Ordering # (<) :: Line -> Line -> Bool # (<=) :: Line -> Line -> Bool # (>) :: Line -> Line -> Bool # (>=) :: Line -> Line -> Bool # max :: Line -> Line -> Line # min :: Line -> Line -> Line #
Read Line Source #
Instance details Defined in Data.Loc.Pos Methods readsPrec :: Int -> ReadS Line # readList :: ReadS [Line] # readPrec :: ReadPrec Line # readListPrec :: ReadPrec [Line] #
Real Line Source #
Instance details Defined in Data.Loc.Pos Methods toRational :: Line -> Rational #
Show Line Source #
Instance details Defined in Data.Loc.Pos Methods showsPrec :: Int -> Line -> ShowS # show :: Line -> String # showList :: [Line] -> ShowS #
ToNat Line Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Line -> Natural Source #

data Column Source #

Instances

Enum Column Source #
Instance details Defined in Data.Loc.Pos Methods succ :: Column -> Column # pred :: Column -> Column # toEnum :: Int -> Column # fromEnum :: Column -> Int # enumFrom :: Column -> [Column] # enumFromThen :: Column -> Column -> [Column] # enumFromTo :: Column -> Column -> [Column] # enumFromThenTo :: Column -> Column -> Column -> [Column] #
Eq Column Source #
Instance details Defined in Data.Loc.Pos Methods (==) :: Column -> Column -> Bool # (/=) :: Column -> Column -> Bool #
Num Column Source #
Instance details Defined in Data.Loc.Pos Methods (+) :: Column -> Column -> Column # (-) :: Column -> Column -> Column # (*) :: Column -> Column -> Column # negate :: Column -> Column # abs :: Column -> Column # signum :: Column -> Column # fromInteger :: Integer -> Column #
Ord Column Source #
Instance details Defined in Data.Loc.Pos Methods compare :: Column -> Column -> Ordering # (<) :: Column -> Column -> Bool # (<=) :: Column -> Column -> Bool # (>) :: Column -> Column -> Bool # (>=) :: Column -> Column -> Bool # max :: Column -> Column -> Column # min :: Column -> Column -> Column #
Read Column Source #
Instance details Defined in Data.Loc.Pos Methods readsPrec :: Int -> ReadS Column # readList :: ReadS [Column] # readPrec :: ReadPrec Column # readListPrec :: ReadPrec [Column] #
Real Column Source #
Instance details Defined in Data.Loc.Pos Methods toRational :: Column -> Rational #
Show Column Source #
Instance details Defined in Data.Loc.Pos Methods showsPrec :: Int -> Column -> ShowS # show :: Column -> String # showList :: [Column] -> ShowS #
ToNat Column Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Column -> Natural Source #

class ToNat a where Source #

Types that can be converted to Natural.

This class mostly exists so that toNat can be used in situations that would normally call for toInteger (which we cannot use because Pos does not have an instance of Integral).

Methods

toNat :: a -> Natural Source #

Instances

ToNat Column Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Column -> Natural Source #
ToNat Line Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Line -> Natural Source #
ToNat Pos Source #
Instance details Defined in Data.Loc.Pos Methods toNat :: Pos -> Natural Source #

Show and Read

posShowsPrec :: Int -> Pos -> ShowS Source #

>>> posShowsPrec minPrec 1 ""
"1"

>>> posShowsPrec minPrec 42 ""
"42"

posReadPrec :: ReadPrec Pos Source #

>>> readPrec_to_S posReadPrec minPrec "1"
[(1,"")]

>>> readPrec_to_S posReadPrec minPrec "42"
[(42,"")]

>>> readPrec_to_S posReadPrec minPrec "0"
[]

>>> readPrec_to_S posReadPrec minPrec "-1"
[]