All newtype stubs now in their own files in their own subdir

1 files changed, 47 insertions, 0 deletions

diff --git a/src/Grasp/Types/IP.hs b/src/Grasp/Types/IP.hs
new file mode 100644
index 0000000..c7d3e4b
--- /dev/null
+++ b/src/Grasp/Types/IP.hs
@@ -0,0 +1,47 @@
+module Grasp.Types.IP (
+	IP,
+
+    singleton,
+    empty,
+    isEmpty,
+    peek,
+    push,
+    pop,
+    shift
+	) where
+
+
+
+
+import Grasp.Types.GNode( GNode )
+
+
+
+
+newtype IP = IP [GNode]
+    deriving (Eq, Show)
+
+
+
+
+singleton :: GNode -> IP
+singleton n = IP [n]
+
+empty :: IP
+empty = IP []
+
+isEmpty :: IP -> Bool
+isEmpty (IP p) = (length p == 0)
+
+peek :: IP -> Maybe GNode
+peek (IP p) = if (length p == 0) then Nothing else Just (head p)
+
+push :: GNode -> IP -> IP
+push n (IP p) = IP (n:p)
+
+pop :: IP -> IP
+pop (IP p) = if (length p == 0) then empty else IP (tail p)
+
+shift :: GNode -> IP -> IP
+shift n (IP p) = if (length p == 0) then empty else IP (n:(tail p))
+