Draft expr compatibility

1 files changed, 22 insertions, 0 deletions

diff --git a/src/context.hs b/src/context.hs
new file mode 100644
index 0000000..c5abfe0
--- /dev/null
+++ b/src/context.hs
@@ -0,0 +1,22 @@
+module Context where
+
+import Data.List
+import Control.Alternative
+
+type Label = String
+data State a = State [a]
+data Context a = Context [Decl] a
+
+instance Functor Context where
+    fmap f (Context state x) = Context (f x) state
+
+getLabel :: Declaration a => State a -> Label -> Maybe a
+getLabel (State decls) l = find (label . (l ==)) decls
+
+class Declaration a where
+    label :: a -> Label
+    -- value for variable
+    -- partial expression where the only variable left is the argument
+    resolve :: a -> State -> b
+
+