Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.scl.compiler / tests / org / simantics / scl / compiler / tests / scl / Search.scl

diff --git a/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Search.scl b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Search.scl
new file mode 100644 (file)
index 0000000..352e92c
--- /dev/null
+++ b/bundles/org.simantics.scl.compiler/tests/org/simantics/scl/compiler/tests/scl/Search.scl
@@ -0,0 +1,47 @@
+import "Prelude" hiding (findFirst)\r
+\r
+infinity = 1e9\r
+\r
+@inline\r
+findFirst :: (a -> <e> Maybe b) -> [a] -> <e> Maybe b\r
+findFirst f l = loop 0\r
+  where\r
+    len = length l\r
+    loop i                         \r
+        | i >= len  = Nothing\r
+        | otherwise = match f (l!i) with\r
+                        s @ (Just _) -> s\r
+                        Nothing      -> loop (i+1)\r
+\r
+dfsFirst :: (a -> <e> Boolean) -> (a -> <e> [a]) -> [a] -> <e> (Maybe a)\r
+dfsFirst acceptable successors initial = tryAll initial\r
+  where\r
+    tryAll l = findFirst loop l\r
+    loop p \r
+        | acceptable p = Just p\r
+        | otherwise    = tryAll (successors p)\r
+\r
+data Weighted a = Weighted a Double\r
+\r
+//type SearchAlgorithm e a =\r
+//    (a -> <e> Boolean) -> (a -> <e> [Weighted a]) -> [Weighted a] -> <e> Weighted (Maybe a)\r
+    \r
+//dfs :: SearchAlgorithm e a\r
+dfs :: (a -> <e> Boolean) -> (a -> <e> [Weighted a]) -> [Weighted a] -> <e> Weighted (Maybe a)\r
+dfs acceptable successors initial = foldl loop (Weighted Nothing infinity) initial\r
+  where\r
+    loop best@(Weighted _ bestW) (Weighted p w)\r
+        | w >= bestW   = best\r
+        | acceptable p = Weighted (Just p) w\r
+        | otherwise    = foldl loop best\r
+                       $ map (\(Weighted p' w') -> Weighted p' (w+w'))\r
+                       $ successors p\r
+\r
+/*\r
+bfs :: SearchAlgorithm e a\r
+\r
+aStar :: (a -> <e> Double) -> SearchAlgorithm e a\r
+*/\r
+main = "Hello"\r
+--\r
+Hello
\ No newline at end of file