From f76cc00c77865639773051205d912a851b302bdc Mon Sep 17 00:00:00 2001
From: pimjager <pim@pimjager.nl>
Date: Tue, 21 Jun 2016 12:20:49 +0200
Subject: [PATCH] fixed chaining of fieldselectors

---
 examples/passBy.spl | 36 ++++++------------------------------
 gen.icl             | 23 +++++++++++++++--------
 2 files changed, 21 insertions(+), 38 deletions(-)

diff --git a/examples/passBy.spl b/examples/passBy.spl
index 552eabe..d463ed1 100644
--- a/examples/passBy.spl
+++ b/examples/passBy.spl
@@ -1,34 +1,10 @@
-//modify1(s) :: [Char] -> [Char] {
-//    //s.hd = 'a';
-//    s.tl = [];
-//    return s;
-//}//
-
-//modify2(c) :: Char -> Void {
-//    c = 'a';
-//}//
-
-//main() {
-//    var zs = "bar";
-//    var zc = 'b';
-//    var zss = modify1(zs);
-//    modify2(zc);//
-
-//    print("zs was bar, is now: ");
-//    print(zs);
-//    print(", m1 returned: ");
-//    print(zss);
-//    print("\n");
-//    print("zc was 'b', is now: ", zc, "\n");
-//}
-
-modi(t) :: (Int,Int) -> Void {
-    t.fst = 1;
+modif(str) :: [Char] -> Void {
+    str.tl.tl.hd = 'z';
 }
 
 main() {
-    var x = (2,3);
-    print(x.fst);
-    modi(x);
-    print(x.fst);
+    var s = "bar";
+    print(s, "\n");
+    modif(s);
+    print(s, "\n");
 }
\ No newline at end of file
diff --git a/gen.icl b/gen.icl
index 3dd4399..b6e22d6 100644
--- a/gen.icl
+++ b/gen.icl
@@ -337,7 +337,7 @@ instance g Stmt where
             Just (ADDR t ar) = case fs of 
                 []  = tell [Instr "stl" [Lit t] ""]
                 _   = tell [Instr "ldl" [Lit t] ""]
-                        >>| mapM_ followFs fs
+                        >>| followFs fs
                         >>| tell [Instr "sta" [Lit 0] ""]
     g (FunStmt k es fs) = funnyStuff k es fs
     g (ReturnStmt Nothing) = tell [Instr "unlink" [] ""]
@@ -348,13 +348,20 @@ instance g Stmt where
 
 //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 []
+followFs :: [FieldSelector] -> Gen()
+followFs [] = tell []
+followFs [FieldHd:fs] = tell [Instr "ldc" [Lit 1] "select hd"
+                             ,Instr "sub" [] "select hd"]
+                        >>| followFs fs
+followFs [FieldTl] = tell []
+followFs [FieldTl:fs] = tell [Instr "lda" [Lit 0] ""]
+                        >>| followFs fs
+followFs [FieldFst:fs] = tell [Instr "ldc" [Lit 1] "select fst"
+                                ,Instr "sub" [] "select fst"]
+                            >>| followFs fs
+followFs [FieldSnd:fs] = tell [Instr "lda" [Lit 0] ""]
+                        >>| followFs fs
+followFs [FieldSnd] = tell []
 
 foldVarDecl :: Int VarDecl -> Gen Int
 foldVarDecl x (VarDecl _ mt k e) = g e 
-- 
2.20.1