KripkeVis

Here you can download KRIPKEVIS.hs, a Haskell module to visualize Kripke frames.

To use this library you should provide three functions which take states, agents, valuations and models as inputs and return strings as output. If your data types are nothing special you can just the standard show function.
The module's functions take these three functions, some additional string and a model as input.

The module works best under Debian Linux and you should have Graphviz, pdfLaTeX and Okular installed. If not, the system() calls should be changed appropriately.

Also note that the directories "tmp/" and "tex/" should exist where you run it.

Try Online

You can see the module in action at Epistemic Logic Online.

Usage Example

The following lines are an example of how to use the module.
The result looks like this:

Download: VISEXAMPLE.hs

module VISEXAMPLE where
import KRIPKEVIS

type Agent = Integer
alice, bob :: Agent
alice = 0
bob = 1

data MyModel = Mo [Int] [(Agent,[[Int]])] [(Int,Bool)] Int

exampleModel = Mo
  [0,1,2]
  [(bob,[[0,1],[2]]),(alice,[[0],[1,2]])]
  [(2,False),(0,True),(1,False)]
  0

showAgent 0 = "Alice"
showAgent 1 = "Bob"

myDispModel :: MyModel -> IO String
myDispModel (Mo states rel val cur)
  = dispModel show showAgent show "" (VisModel states rel val cur)
  
main :: IO ()
main = do
  result <- myDispModel exampleModel
  putStrLn result

Source Code

Download: KRIPKEVIS.hs

-- KRIPKEVIS.hs, version from 2014-04-22 by Malvin Gattinger

module KRIPKEVIS where
import Data.List
import System.IO
import System.Process

begintab  = "\\\\begin{tabular}{c}"
endtab    = "\\\\end{tabular}"
newline   = " \\\\\\\\[0pt] "

type PartitionOf a = [[a]]

data VisModel a b c = VisModel [a] [(b,PartitionOf a)] [(a,c)] a

stringModel :: Ord a => Eq a => Eq b => Show a => Show b =>
  (a -> String) -> (b -> String) -> (c -> String) -> String
    -> VisModel a b c
      -> String
stringModel showState showAgents showVal information model =
  "graph G { \n\
   \  node [shape=doublecircle,label=\""
    ++ labelof cur ++ "\"] w" ++ showState cur ++ ";\n"
    ++ "  edge [lblstyle=auto]; \n"
    ++ concat [ ndlinefor s | s <- otherstates ]
    ++ "  rankdir=LR; \n size=\"8,5\" \n"
    ++ concat [   "  w" ++ show x ++" -- w"++ show y
	      ++"[ label = \""++ showAgents a ++"\" ]; \n"
	    | (a,x,y) <- edges  ]
    ++ "  label = \""++information++"\"; \n "
    ++ "  fontsize=18; \n"
    ++ "} \n"
  where
    (VisModel states rel val cur) = model
    labelof s = begintab ++ "\\\\textbf{" ++ showState s ++ "}" ++ newline ++ showVal (visApply val s) ++ endtab
    ndlinefor s = "  node [shape=circle,label=\""
		++ labelof s ++ "\"] w" ++ show s ++ ";\n"
    otherstates = delete cur states
    edges = nub $ concat $ concat $ concat [ [ [ if (x < y) then [(a,x,y)] else [] | x <- part, y <- part ] | part <- (visApply rel a) ] | a <- (agents model) ]
    agents (VisModel _ rel _ _) = map fst rel

dotModel :: Ord a => Eq a => Eq b => Show a => Show b =>
  (a -> String) -> (b -> String) -> (c -> String) -> String
    -> VisModel a b c
      -> String -> IO String
dotModel showState showAgents showVal info model filename =
  let gstring = stringModel showState showAgents showVal info model
  in do
    newFile <- openFile (filename) WriteMode
    hPutStrLn newFile gstring
    hClose newFile
    return ("The model was DOT'd to "++filename)

texModel :: Ord a => Eq a => Eq b => Show a => Show b =>
  (a -> String) -> (b -> String) -> (c -> String) -> String
    -> VisModel a b c
      -> String -> IO String
texModel showState showAgents showVal info model filename =
  let gstring = stringModel showState showAgents showVal info model
  in do
    forget <- dotModel showState showAgents showVal info model ("tex/"++filename++".dot")
    putStrLn forget
    pid <- system ("cd tex/; dot2tex --figonly -ftikz -traw -p --autosize --tikzedgelabels -w --usepdflatex "++filename++".dot > "++filename++".tex;" )
    return ("Model was TeX'd into the file tex/" ++ filename ++ ".tex")

dispModel :: Ord a => Eq a => Eq b => Show a => Show b =>
  (a -> String) -> (b -> String) -> (c -> String) -> String
    -> VisModel a b c
      -> IO String
dispModel showState showAgents showVal info model =
  let gstring = stringModel showState showAgents showVal info model
  in do
    forget <- dotModel showState showAgents showVal info model "tmp/temp.dot"
    putStrLn forget
    pid <- system ("cd tmp/; dot2tex -ftikz -traw -p --autosize --tikzedgelabels -w --usepdflatex temp.dot > temp.tex; pdflatex -interaction=nonstopmode temp.tex > temp.pdlatex.log; okular temp.pdf;" )
    return ("Model was TeX'd and shown.")

-- A helper function to apply relations:

visApply :: Show a => Eq a => [(a,b)] -> a -> b
visApply rel left =
  if (elem left ( map fst rel ))
    then snd $ head $ filter (\(a,b) -> a==left) rel
    else
      error ("Applying of a relation failed. Cannot visualize this.")

CC-BY-SA
Malvin Gattinger