63 lines
1.7 KiB
Haskell
63 lines
1.7 KiB
Haskell
{- a simple graphviz / dot(1) digraph description generator library
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-
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- Copyright 2010 Joey Hess <id@joeyh.name>
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-
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- License: BSD-2-clause
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-}
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module Utility.Dot where -- import qualified
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{- generates a graph description from a list of lines -}
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graph :: [String] -> String
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graph s = unlines $ [header] ++ map indent s ++ [footer]
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where
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header = "digraph map {"
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footer= "}"
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{- a node in the graph -}
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graphNode :: String -> String -> String
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graphNode nodeid desc = label desc $ quote nodeid
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{- an edge between two nodes -}
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graphEdge :: String -> String -> Maybe String -> String
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graphEdge fromid toid desc = indent $ maybe edge (`label` edge) desc
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where
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edge = quote fromid ++ " -> " ++ quote toid
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{- adds a label to a node or edge -}
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label :: String -> String -> String
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label = attr "label"
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{- adds an attribute to a node or edge
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- (can be called multiple times for multiple attributes) -}
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attr :: String -> String -> String -> String
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attr a v s = s ++ " [ " ++ a ++ "=" ++ quote v ++ " ]"
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{- fills a node with a color -}
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fillColor :: String -> String -> String
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fillColor color s = attr "fillcolor" color $ attr "style" "filled" s
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{- apply to graphNode to put the node in a labeled box -}
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subGraph :: String -> String -> String -> String -> String
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subGraph subid l color s =
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"subgraph " ++ name ++ " {\n" ++
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ii setlabel ++
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ii setfilled ++
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ii setcolor ++
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ii s ++
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indent "}"
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where
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-- the "cluster_" makes dot draw a box
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name = quote ("cluster_" ++ subid)
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setlabel = "label=" ++ quote l
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setfilled = "style=" ++ quote "filled"
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setcolor = "fillcolor=" ++ quote color
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ii x = indent (indent x) ++ "\n"
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indent ::String -> String
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indent s = '\t' : s
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quote :: String -> String
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quote s = "\"" ++ s' ++ "\""
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where
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s' = filter (/= '"') s
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