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add symbol, symbols #298

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merged 2 commits into from
Aug 15, 2022
Merged

add symbol, symbols #298

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f19abb1
add symbol, symbols
Aug 14, 2022
ce5bc78
apply suggestion and remove mention of Dioid (Label a) instance
Aug 15, 2022
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10 changes: 9 additions & 1 deletion src/Algebra/Graph/Label.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -22,7 +22,7 @@ module Algebra.Graph.Label (
NonNegative, finite, finiteWord, unsafeFinite, infinite, getFinite,
Distance, distance, getDistance, Capacity, capacity, getCapacity,
Count, count, getCount, PowerSet (..), Minimum, getMinimum, noMinimum,
Path, Label, isZero, RegularExpression,
Path, Label, symbol, symbols, isZero, RegularExpression,

-- * Combining edge labels
Optimum (..), ShortestPath, AllShortestPaths, CountShortestPaths, WidestPath
Expand Down Expand Up @@ -377,6 +377,14 @@ data Label a = Zero
infixl 6 :+:
infixl 7 :*:

-- | Wrap a value into a 'Symbol' constructor
symbol :: a -> Label a
symbol = Symbol

-- | Wrap a list of values into 'Symbol' constructors terminated by 'Zero'
symbols :: Foldable t => t a -> Label a
symbols = foldr ((<>) . Symbol) Zero

instance IsList (Label a) where
type Item (Label a) = a
fromList = foldr ((<>) . Symbol) Zero
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