X-Git-Url: https://git.rrq.au/?a=blobdiff_plain;f=sys.f;h=92efcb4667734414aecfc2bfb2a43a83627301cb;hb=4061939a8f1a4afd749434ed70a6122016c0a8dc;hp=bc9dae9b53f5cae19ac523786215678299ae9e3c;hpb=c4dd16293a71e782e36f795d302bf944056ffd4c;p=rrq%2Fjonasforth.git

diff --git a/sys.f b/sys.f
index bc9dae9..92efcb4 100644
--- a/sys.f
+++ b/sys.f
@@ -9,3 +9,70 @@ EXIT [
   [ S" [" FIND >CFA , ]
   EXIT
 [ IMMEDIATE
+
+: IF IMMEDIATE
+  ' 0BRANCH ,
+  HERE @
+  0 ,
+;
+
+: THEN IMMEDIATE
+  DUP
+  HERE @ SWAP -
+  SWAP !
+;
+
+: ELSE IMMEDIATE
+  ' BRANCH ,
+  HERE @
+  0 ,
+  SWAP DUP HERE @ SWAP - SWAP !
+;
+
+: BEGIN IMMEDIATE
+  HERE @
+;
+
+: AGAIN IMMEDIATE
+  ' BRANCH ,
+  HERE @ - , ;
+
+: ( IMMEDIATE
+  BEGIN
+    READ-WORD
+    1 = IF
+      C@ 41 = IF
+        EXIT
+      THEN
+    ELSE
+      DROP
+    THEN
+  AGAIN ;
+
+: UNTIL IMMEDIATE
+  ' 0BRANCH ,
+  HERE @ - ,
+;
+
+( Compile a literal value into the current word. )
+: LIT, IMMEDIATE ( x -- )
+  ' LIT , , ;
+
+: / /MOD DROP ;
+: MOD /MOD SWAP DROP ;
+: NEG 0 SWAP - ;
+
+: C,
+  HERE @ C!
+  HERE @ 1 +
+  HERE ! ;
+
+: OVER ( a b -- a b a ) SWAP DUP ROT ;
+
+( Compile the given string into the current word directly. )
+: STORE-STRING ( str len -- )
+  BEGIN
+    OVER C@ C,
+    SWAP 1 + SWAP
+  1 - DUP 0 = UNTIL
+  DROP DROP ;