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41 lines
893 B
Plaintext
41 lines
893 B
Plaintext
---- MODULE dag ----
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EXTENDS TLC, Integers
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CONSTANT
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NumNodes, Null
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Nodes == 1..NumNodes
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VARIABLE graph, pc, tmp, edges
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vars == << graph, pc, tmp, edges >>
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Init == /\ graph = {}
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/\ pc = "GetEdge"
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/\ tmp = Null
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/\ edges = {x \in (Nodes \X Nodes): x[1] # x[2]}
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GetEdge == /\ tmp = Null
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/\ \/ /\ graph = {}
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/\ tmp' = Null
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\/ tmp' = CHOOSE e \in edges: (e \notin graph /\ e[1] # e[2])
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/\ edges' = edges \ {tmp'}
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/\ pc' = "AddEdge"
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/\ UNCHANGED graph
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AddEdge == /\ tmp # Null
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/\ graph' = (graph \union {tmp})
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/\ pc' = "Done"
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/\ tmp' = Null
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/\ UNCHANGED edges
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Terminating == /\ pc = "Done"
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/\ UNCHANGED vars
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Next == \/ GetEdge \/ AddEdge
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\/ Terminating
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Termination == <>(pc = "Done")
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Spec == Init /\ [][Next]_vars
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====
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