deferst.kahn — employeerepublic/deferst 0.7.0

kahn-sort clj/s

(kahn-sort g)

(kahn-sort g l s)

Proposes a topological sort for directed graph g using Kahn's algorithm, where g is a map of nodes to sets of nodes. If g is cyclic, returns nil.

no-incoming clj/s

(no-incoming g)

Returns the set of nodes in graph g for which there are no incoming edges, where g is a map of nodes to sets of nodes.

normalize clj/s

(normalize g)

Returns g with empty outgoing edges added for nodes with incoming edges only. Example: {:a #{:b}} => {:a #{:b}, :b #{}}

take-1 clj/s

(take-1 s)

Returns the pair [element, s'] where s' is set s with element removed.

without clj/s

(without s x)

Returns set s with x removed.