Data.Ranged.RangedSet

Contents

Ranged Set Type
Ranged Set construction functions and their preconditions
Predicates
Set Operations
Useful Sets
QuickCheck Properties

Synopsis

Ranged Set Type

An RSet (for Ranged Set) is a list of ranges. The ranges must be sorted and not overlap.

Instances

DiscreteOrdered v => Eq (RSet v)
(Show v, DiscreteOrdered v) => Show (RSet v)
(Arbitrary v, DiscreteOrdered v, Show v) => Arbitrary (RSet v)
DiscreteOrdered a => Monoid (RSet a)

rSetRanges :: RSet v -> [Range v]Source

Ranged Set construction functions and their preconditions

makeRangedSet :: DiscreteOrdered v => [Range v] -> RSet vSource

Create a new Ranged Set from a list of ranges. The list may contain ranges that overlap or are not in ascending order.

unsafeRangedSet :: DiscreteOrdered v => [Range v] -> RSet vSource

Create a new Ranged Set from a list of ranges. validRangeList ranges must return True. This precondition is not checked.

validRangeList :: DiscreteOrdered v => [Range v] -> Bool Source

Determine if the ranges in the list are both in order and non-overlapping. If so then they are suitable input for the unsafeRangedSet function.

normaliseRangeList :: DiscreteOrdered v => [Range v] -> [Range v]Source

Rearrange and merge the ranges in the list so that they are in order and non-overlapping.

rSingleton :: DiscreteOrdered v => v -> RSet vSource

Create a Ranged Set from a single element.

rSetUnfold Source

Arguments

:: DiscreteOrdered a
=> Boundary a	A first lower boundary.
-> (Boundary a -> Boundary a)	A function from a lower boundary to an upper boundary, which must return a result greater than the argument (not checked).
-> (Boundary a -> Maybe (Boundary a))	A function from a lower boundary to `Maybe` the successor lower boundary, which must return a result greater than the argument (not checked). If ranges overlap then they will be merged.
-> RSet a

Construct a range set.

Predicates

rSetIsEmpty :: DiscreteOrdered v => RSet v -> Bool Source

True if the set has no members.

rSetIsFull :: DiscreteOrdered v => RSet v -> Bool Source

True if the negation of the set has no members.

(-?-) :: DiscreteOrdered v => RSet v -> v -> Bool Source

True if the value is within the ranged set. Infix precedence is left 5.

rSetHas :: DiscreteOrdered v => RSet v -> v -> Bool Source

(-<=-) :: DiscreteOrdered v => RSet v -> RSet v -> Bool Source

True if the first argument is a subset of the second argument, or is equal.

Infix precedence is left 5.

rSetIsSubset :: DiscreteOrdered v => RSet v -> RSet v -> Bool Source

(-<-) :: DiscreteOrdered v => RSet v -> RSet v -> Bool Source

True if the first argument is a strict subset of the second argument.

Infix precedence is left 5.

rSetIsSubsetStrict :: DiscreteOrdered v => RSet v -> RSet v -> Bool Source

Set Operations

(-\/-) :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

Set union for ranged sets. Infix precedence is left 6.

rSetUnion :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

(-/\-) :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

Set intersection for ranged sets. Infix precedence is left 7.

rSetIntersection :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

(-!-) :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

Set difference. Infix precedence is left 6.

rSetDifference :: DiscreteOrdered v => RSet v -> RSet v -> RSet vSource

rSetNegation :: DiscreteOrdered a => RSet a -> RSet aSource

Set negation.

Useful Sets

rSetEmpty :: DiscreteOrdered a => RSet aSource

The empty set.

rSetFull :: DiscreteOrdered a => RSet aSource

The set that contains everything.

QuickCheck Properties

Construction

prop_validNormalised :: DiscreteOrdered a => [Range a] -> Bool Source

A normalised range list is valid for unsafeRangedSet

 prop_validNormalised ls = validRangeList $ normaliseRangeList ls

prop_has :: DiscreteOrdered a => [Range a] -> a -> Bool Source

Iff a value is in a range list then it is in a ranged set constructed from that list.

 prop_has ls v = (ls `rangeListHas` v) == makeRangedSet ls -?- v

prop_unfold :: Integer -> Bool Source

Verifies the correct membership of a set containing all integers starting with the digit "1" up to 19999.

 prop_unfold = (v <= 99999 && head (show v) == '1') == (initial1 -?- v)
    where
       initial1 = rSetUnfold (BoundaryBelow 1) addNines times10
       addNines (BoundaryBelow n) = BoundaryAbove $ n * 2 - 1
       times10 (BoundaryBelow n) = 
          if n <= 1000 then Just $ BoundaryBelow $ n * 10 else Nothing

Basic Operations

prop_union :: DiscreteOrdered a => RSet a -> RSet a -> a -> Bool Source

Iff a value is in either of two ranged sets then it is in the union of those two sets.

 prop_union rs1 rs2 v = 
    (rs1 -?- v || rs2 -?- v) == ((rs1 -\/- rs2) -?- v)

prop_intersection :: DiscreteOrdered a => RSet a -> RSet a -> a -> Bool Source

Iff a value is in both of two ranged sets then it is n the intersection of those two sets.

 prop_intersection rs1 rs2 v =
    (rs1 -?- v && rs2 -?- v) == ((rs1 -/\- rs2) -?- v)

prop_difference :: DiscreteOrdered a => RSet a -> RSet a -> a -> Bool Source

Iff a value is in ranged set 1 and not in ranged set 2 then it is in the difference of the two.

 prop_difference rs1 rs2 v =
    (rs1 -?- v && not (rs2 -?- v)) == ((rs1 -!- rs2) -?- v)

prop_negation :: DiscreteOrdered a => RSet a -> a -> Bool Source

Iff a value is not in a ranged set then it is in its negation.

 prop_negation rs v = rs -?- v == not (rSetNegation rs -?- v)

prop_not_empty :: DiscreteOrdered a => RSet a -> a -> Property Source

A set that contains a value is not empty

 prop_not_empty rs v = (rs -?- v) ==> not (rSetIsEmpty rs)

Some Identities and Inequalities

prop_empty :: DiscreteOrdered a => a -> Bool Source

The empty set has no members.

 prop_empty v = not (rSetEmpty -?- v)

prop_full :: DiscreteOrdered a => a -> Bool Source

The full set has every member.

 prop_full v = rSetFull -?- v

prop_empty_intersection :: DiscreteOrdered a => RSet a -> Bool Source

The intersection of a set with its negation is empty.

 prop_empty_intersection rs =
    rSetIsEmpty (rs -/\- rSetNegation rs)

prop_full_union :: DiscreteOrdered a => RSet a -> Bool Source

The union of a set with its negation is full.

 prop_full_union rs v =
    rSetIsFull (rs -\/- rSetNegation rs)

prop_union_superset :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

The union of two sets is the non-strict superset of both.

 prop_union_superset rs1 rs2 =
    rs1 -<=- u && rs2 -<=- u
    where
       u = rs1 -\/- rs2

prop_intersection_subset :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

The intersection of two sets is the non-strict subset of both.

 prop_intersection_subset rs1 rs2 =
    i -<=- rs1 && i -<=- rs2
    where
       i = rs1 -/\- rs2

prop_diff_intersect :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

The difference of two sets intersected with the subtractand is empty.

 prop_diff_intersect rs1 rs2 =
    rSetIsEmpty ((rs1 -!- rs2) -/\- rs2)

prop_subset :: DiscreteOrdered a => RSet a -> Bool Source

A set is the non-strict subset of itself.

 prop_subset rs = rs -<=- rs

prop_strict_subset :: DiscreteOrdered a => RSet a -> Bool Source

A set is not the strict subset of itself.

 prop_strict_subset rs = not (rs -<- rs)

prop_union_strict_superset :: DiscreteOrdered a => RSet a -> RSet a -> Property Source

If rs1 - rs2 is not empty then the union of rs1 and rs2 will be a strict superset of rs2.

 prop_union_strict_superset rs1 rs2 =
    (not $ rSetIsEmpty (rs1 -!- rs2))
    ==> (rs2 -<- (rs1 -\/- rs2))

prop_intersection_commutes :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

Intersection commutes.

 prop_intersection_commutes rs1 rs2 = (rs1 -/\- rs2) == (rs2 -/\- rs1)

prop_union_commutes :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

Union commutes.

 prop_union_commutes rs1 rs2 = (rs1 -\/- rs2) == (rs2 -\/- rs1)

prop_intersection_associates :: DiscreteOrdered a => RSet a -> RSet a -> RSet a -> Bool Source

Intersection associates.

 prop_intersection_associates rs1 rs2 rs3 =
    ((rs1 -/\- rs2) -/\- rs3) == (rs1 -/\- (rs2 -/\- rs3))

prop_union_associates :: DiscreteOrdered a => RSet a -> RSet a -> RSet a -> Bool Source

Union associates.

 prop_union_associates rs1 rs2 rs3 =
    ((rs1 -\/- rs2) -\/- rs3) == (rs1 -\/- (rs2 -\/- rs3))

prop_de_morgan_intersection :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

De Morgan's Law for Intersection.

 prop_de_morgan_intersection rs1 rs2 =
    rSetNegation (rs1 -/\- rs2) == (rSetNegation rs1 -\/- rSetNegation rs2)

prop_de_morgan_union :: DiscreteOrdered a => RSet a -> RSet a -> Bool Source

De Morgan's Law for Union.

 prop_de_morgan_union rs1 rs2 =
    rSetNegation (rs1 -\/- rs2) == (rSetNegation rs1 -/\- rSetNegation rs2)