From: Tim Vaughan <tgvaughan@gmail.com>
Date: Thu, 21 Jul 2016 08:29:26 +0000 (+1200)
Subject: Adding pair/list primitives.
X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=commitdiff_plain;h=d1107557350ae9101bfa387dd2af2cad541193cc;p=scheme.forth.jl.git

Adding pair/list primitives.
---

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index c99a0c0..c1f3626 100644
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -211,3 +211,54 @@
 
     mod fixnum-type
 ; make-primitive remainder
+
+( = Pairs and Lists = )
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+
+    2dup car 2swap cdr car
+    cons
+; make-primitive cons
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    
+
+    2dup car 2swap cdr car
+    cons
+; make-primitive cons
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    car pair-type ensure-arg-type
+
+    car
+; make-primitive car
+
+:noname ( args -- pair )
+    2dup 1 ensure-arg-count
+    car pair-type ensure-arg-type
+
+    cdr
+; make-primitive cdr
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+    2dup car pair-type ensure-arg-type
+    swap cdr car
+
+    2swap set-car!
+
+    ok-symbol
+; make-primitive set-car!
+
+:noname ( args -- pair )
+    2dup 2 ensure-arg-count
+    2dup car pair-type ensure-arg-type
+    swap cdr car
+
+    2swap set-cdr!
+
+    ok-symbol
+; make-primitive set-cdr!