suzanne.soy/tock-mirror
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Added a safety check when building the flow graph

Browse Source
This commit is contained in:
Neil Brown 2007-11-10 23:18:01 +00:00
parent ff01b24efd
commit 089091d59b
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
common/FlowGraph.hs
View File

@ -127,7 +127,11 @@ buildFlowGraph funcs s
addEdge :: EdgeLabel -> Node -> Node -> GraphMaker mLabel mAlter label ()
addEdge label start end = do (n, pi, (nodes, edges)) <- get
put (n + 1, pi, (nodes,(start, end, label):edges))
-- Edges should only be added after the nodes, so
-- for safety here we can check that the nodes exist:
if (notElem start $ map fst nodes) || (notElem end $ map fst nodes)
then throwError "Could not add edge between non-existent nodes"
else put (n + 1, pi, (nodes,(start, end, label):edges))
addNode' :: Meta -> (GraphLabelFuncs mLabel label -> (b -> mLabel label)) -> b -> AlterAST mAlter -> GraphMaker mLabel mAlter label Node
addNode' m f t r = do val <- (lift . lift) (run f t)