From 5f51b53ee01b91e1996ede1c515167af41a44571 Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Tue, 21 Jun 2016 12:12:11 +0200
Subject: [PATCH] Fieldselectors when assigning

---
 examples/old/quickTest.spl | 12 +++++++-----
 gen.icl                    | 16 +++++++++++++++-
 sem.icl                    |  2 +-
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/examples/old/quickTest.spl b/examples/old/quickTest.spl
index 8a9cc26..da09eeb 100644
--- a/examples/old/quickTest.spl
+++ b/examples/old/quickTest.spl
@@ -1,9 +1,11 @@
-x() {
-    return [[1,2,3]];
+printInts(xs) :: [Int] -> Void {
+    if(isEmpty(xs)) { return; }
+    else { print(xs.hd); printInts(xs.tl); }
 }
 
 main() {
-
-    var z = x().hd.hd;
-
+    var xs = [1,2,3];  
+    xs.hd = 18;
+    xs.tl = [];
+    printInts(xs);
 }
\ No newline at end of file
diff --git a/gen.icl b/gen.icl
index 0707984..3dd4399 100644
--- a/gen.icl
+++ b/gen.icl
@@ -334,7 +334,11 @@ instance g Stmt where
         g e >>| getAdressbook >>= \ab->case 'Map'.get k ab of
             Nothing = liftT (Left $ Error $ concat ["PANIC: ", k, " not found as var"])
             Just (LAB t _ _) = liftT (Left $ Error $ "PANIC: cannot assign to function")
-            Just (ADDR t ar) = tell [Instr "stl" [Lit t] ""]
+            Just (ADDR t ar) = case fs of 
+                []  = tell [Instr "stl" [Lit t] ""]
+                _   = tell [Instr "ldl" [Lit t] ""]
+                        >>| mapM_ followFs fs
+                        >>| tell [Instr "sta" [Lit 0] ""]
     g (FunStmt k es fs) = funnyStuff k es fs
     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
 		>>| tell [Instr "ret" [] ""]
@@ -342,6 +346,16 @@ instance g Stmt where
 		>>| tell [Instr "str" [Raw "RR"] ""] 
 		>>| g (ReturnStmt Nothing)
 
+//expects the heap address to the var to slect on to be on the stack
+//and leaves the heap adress to write to on the stack
+followFs :: FieldSelector -> Gen()
+followFs FieldHd = tell [Instr "ldc" [Lit 1] "select hd"
+                        ,Instr "sub" [] "select hd"]
+followFs FieldTl = tell []
+followFs FieldFst = tell [Instr "ldc" [Lit 1] "select fst"
+                         ,Instr "sub" [] "select fst"]
+followFs FieldSnd = tell []
+
 foldVarDecl :: Int VarDecl -> Gen Int
 foldVarDecl x (VarDecl _ mt k e) = g e 
     >>| annote x k
diff --git a/sem.icl b/sem.icl
index fd9eb5c..8ca24cf 100644
--- a/sem.icl
+++ b/sem.icl
@@ -405,7 +405,7 @@ instance infer Stmt where
 
 reverseFs :: Type FieldSelector -> Typing Type 
 reverseFs t FieldHd = pure $ ListType t
-reverseFs t FieldTl = pure $ ListType t 
+reverseFs t FieldTl = pure t 
 reverseFs t FieldFst = fresh >>= \tv -> pure $ TupleType (t, tv)
 reverseFs t FieldSnd = fresh >>= \tv -> pure $ TupleType (tv, t)
 
-- 
2.20.1