ghc-6.12.2: The GHC APISource codeContentsIndex
GraphColor
Description
Graph Coloring. This is a generic graph coloring library, abstracted over the type of the node keys, nodes and colors.
Synopsis
module GraphBase
module GraphOps
module GraphPpr
colorGraph :: (Uniquable k, Uniquable cls, Uniquable color, Eq color, Eq cls, Ord k, Outputable k, Outputable cls, Outputable color) => Bool -> Int -> UniqFM (UniqSet color) -> Triv k cls color -> (Graph k cls color -> k) -> Graph k cls color -> (Graph k cls color, UniqSet k, UniqFM k)
Documentation
module GraphBase
module GraphOps
module GraphPpr
colorGraphSource
:: (Uniquable k, Uniquable cls, Uniquable color, Eq color, Eq cls, Ord k, Outputable k, Outputable cls, Outputable color)
=> Boolwhether to do iterative coalescing
-> Inthow many times we've tried to color this graph so far.
-> UniqFM (UniqSet color)map of (node class -> set of colors available for this class).
-> Triv k cls colorfn to decide whether a node is trivially colorable.
-> Graph k cls color -> kfn to choose a node to potentially leave uncolored if nothing is trivially colorable.
-> Graph k cls colorthe graph to color.
-> (Graph k cls color, UniqSet k, UniqFM k)
Try to color a graph with this set of colors. Uses Chaitin's algorithm to color the graph. The graph is scanned for nodes which are deamed 'trivially colorable'. These nodes are pushed onto a stack and removed from the graph. Once this process is complete the graph can be colored by removing nodes from the stack (ie in reverse order) and assigning them colors different to their neighbors.
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