Marked compound procedure type as pairlike.

[scheme.forth.jl.git] / scheme-primitives.4th

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index 87cbdd4..b347d8a 100644 (file)
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -45,7 +45,7 @@
 :noname ( args -- boolobj )
     2dup 1 ensure-arg-count
 
-    car primitive-type istype? -rot 2drop boolean-type
+    car primitive-proc-type istype? -rot 2drop boolean-type
 ; make-primitive procedure?
 
 ( = Type conversions = )
@@ -212,6 +212,73 @@
     mod fixnum-type
 ; make-primitive remainder
 
+variable relcfa
+
+: test-relation ( args -- bool )
+
+    2dup nil objeq? if
+        2drop
+        true boolean-type exit
+    then
+
+    ( args )
+
+    2dup car fixnum-type ensure-arg-type ( args arg0 )
+    2swap cdr ( arg0 args' )
+
+    2dup nil objeq? if
+        2drop 2drop
+        true boolean-type exit
+    then
+
+    ( arg0 args' )
+
+    begin
+        2dup nil objeq? false =
+    while
+        2dup car fixnum-type ensure-arg-type ( arg0 args' arg1 )
+        2rot 2swap 2dup 2rot 2swap ( args' arg1 arg1 arg0 )
+        relcfa @ execute false = if
+            2drop 2drop
+            false boolean-type exit
+        then
+
+        2swap cdr ( arg0 args'' )
+    repeat
+
+    2drop 2drop
+    true boolean-type
+; 
+
+: fixnum-lt ( obj1 obj2 -- bool )
+    drop swap drop <
+;
+
+:noname
+    ['] fixnum-lt relcfa !
+    test-relation
+; make-primitive <
+
+: fixnum-gt ( obj1 obj2 -- bool )
+    drop swap drop >
+;
+
+:noname
+    ['] fixnum-gt relcfa !
+    test-relation
+; make-primitive >
+
+: fixnum-eq ( obj1 obj2 -- bool )
+    drop swap drop =
+;
+
+:noname
+    ['] fixnum-eq relcfa !
+    test-relation
+; make-primitive =
+
+hide relcfa
+
 ( = Pairs and Lists = )
 
 :noname ( args -- pair )
@@ -221,6 +288,10 @@
     cons
 ; make-primitive cons
 
+:noname ( args -- list )
+    \ args is already a list!
+; make-primitive list
+
 :noname ( args -- pair )
     2dup 1 ensure-arg-count
     car pair-type ensure-arg-type
@@ -254,3 +325,13 @@
 
     ok-symbol
 ; make-primitive set-cdr!
+
+( = Polymorphic equality testing = )
+
+:noname ( args -- bool )
+    2dup 2 ensure-arg-count
+    2dup cdr car
+    2swap car
+
+    objeq? boolean-type
+; make-primitive eq?