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(.module:
[lux #*
[data
["." product]
[text ("text/." equivalence)]
[collection
[list ("list/." functor)]]]])
(type: #export (PList a)
(List [Text a]))
(def: #export (get key properties)
(All [a] (-> Text (PList a) (Maybe a)))
(case properties
#.Nil
#.None
(#.Cons [k' v'] properties')
(if (text/= key k')
(#.Some v')
(get key properties'))))
(do-template [<name> <type> <access>]
[(def: #export <name>
(All [a] (-> (PList a) (List <type>)))
(list/map <access>))]
[keys Text product.left]
[values a product.right]
)
(def: #export (contains? key properties)
(All [a] (-> Text (PList a) Bit))
(case (get key properties)
(#.Some _)
#1
#.None
#0))
(def: #export (put key val properties)
(All [a] (-> Text a (PList a) (PList a)))
(case properties
#.Nil
(list [key val])
(#.Cons [k' v'] properties')
(if (text/= key k')
(#.Cons [key val]
properties')
(#.Cons [k' v']
(put key val properties')))))
(def: #export (update key f properties)
(All [a] (-> Text (-> a a) (PList a) (PList a)))
(case properties
#.Nil
#.Nil
(#.Cons [k' v'] properties')
(if (text/= key k')
(#.Cons [k' (f v')] properties')
(#.Cons [k' v'] (update key f properties')))))
(def: #export (remove key properties)
(All [a] (-> Text (PList a) (PList a)))
(case properties
#.Nil
properties
(#.Cons [k' v'] properties')
(if (text/= key k')
properties'
(#.Cons [k' v']
(remove key properties')))))
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