{- |

Module : $Header$

Description : Display of development graphs using Graphviz\/dot

Copyright : (c) Till Mossakowski, Klaus L�ttich Uni Bremen 2002-2006

License : similar to LGPL, see HetCATS/LICENSE.txt or LIZENZ.txt

Maintainer : till@tzi.de

Stability : provisional

Portability : non-portable(Logic)

Display of development graphs using Graphviz\/dot

-}

module Static.DotGraph(dotGraph) where

import Data.Graph.Inductive.Graph

import Static.DevGraph

import Data.List (intersperse)

import Logic.Grothendieck (isHomogeneous)

edgeAttribute :: DGLinkType -> String

edgeAttribute LocalDef = " [style=bold"

edgeAttribute GlobalDef = " [style=bold"

edgeAttribute HidingDef = " [style=bold,arrowhead=vee"

edgeAttribute (FreeDef _) = " [style=bold"

edgeAttribute (CofreeDef _) = " [style=bold"

edgeAttribute (LocalThm _ _con _) = " [arrowhead=onormal"

edgeAttribute (GlobalThm _ _con _) = " [arrowhead=onormal"

edgeAttribute (HidingThm _ _) = " [arrowhead=vee"

edgeAttribute (FreeThm _ _) = " [arrowhead=onormal"

showNode :: DGraph -> Node -> String

showNode dg n = case getDGNodeName $ lab' $ context dg n of

xs | null xs -> "n__" ++ show n

| otherwise -> xs

dotEdge :: DGraph -> (Node, Node, DGLinkLab) -> String

dotEdge dg (n1, n2, link) =

showNode dg n1 ++ " -> " ++ showNode dg n2

++ edgeAttribute (dgl_type link) ++ het ++ "];"

where het = if isHomogeneous $ dgl_morphism link

then ""

else ",color=\"black:white:black\",arrowsize=1.6"

nodeAttribute :: Bool -> DGNodeLab -> String

nodeAttribute showInternal la =

case concat $ intersperse "," (inter la ++

(if isDGRef la

then ["shape=box"]

else []) ++

(if hasOpenGoals la

then ["style=filled","fillcolor=grey"]

else [])) of

xs | null xs -> ""

| otherwise -> '[' : xs ++ "]"

where inter l = if isInternalNode l && not showInternal

then ["label=\"\",height=0.2,width=0.35"]

else []

dotNode :: Bool -> DGraph -> (Node, DGNodeLab) -> String

dotNode showInternal dg (n, ncontents) =

showNode dg n ++ nodeAttribute showInternal ncontents ++ ";"

-- | Generate a dot term representation out of a development graph

dotGraph :: Bool -- ^ True means show internal node labels

-> DGraph -> String

dotGraph showInternalNodeLabels dg = unlines $

["digraph G {"," size = \"8,6\""," "] ++

map (dotNode showInternalNodeLabels dg) (labNodes dg) ++

map (dotEdge dg) (labEdges dg)++["}"]