Working on FP arithmetic.

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

diff --git a/scheme.4th b/scheme.4th
index 893b20b..e1126ff 100644 (file)
--- a/scheme.4th
+++ b/scheme.4th
@@ -3,24 +3,37 @@ scheme definitions
 
 include term-colours.4th
 include defer-is.4th
+include throw-catch.4th
+
+defer read
+defer eval
+defer print
 
 \ ------ Types ------
 
-0 constant fixnum-type
-1 constant boolean-type
-2 constant character-type
-3 constant string-type
-4 constant nil-type
-5 constant pair-type
-6 constant symbol-type
-7 constant primitive-proc-type
-8 constant compound-proc-type
+variable nexttype
+0 nexttype !
+: make-type
+    create nexttype @ ,
+    nexttype @ 1+ nexttype !
+    does> @ ;
+
+make-type fixnum-type
+make-type real-type
+make-type boolean-type
+make-type character-type
+make-type string-type
+make-type nil-type
+make-type pair-type
+make-type symbol-type
+make-type primitive-proc-type
+make-type compound-proc-type
 : istype? ( obj type -- obj bool )
     over = ;
 
 \ ------ Cons cell memory ------ {{{
 
-1000 constant N
+10000 constant N
 create car-cells N allot
 create car-type-cells N allot
 create cdr-cells N allot
@@ -376,8 +389,6 @@ include scheme-primitives.4th
 
 \ ---- Read ---- {{{
 
-defer read
-
 variable parse-idx
 variable stored-parse-idx
 create parse-str 161 allot
@@ -785,8 +796,6 @@ parse-idx-stack parse-idx-sp !
 
 \ ---- Eval ---- {{{
 
-defer eval
-
 : self-evaluating? ( obj -- obj bool )
     boolean-type istype? if true exit then
     fixnum-type istype? if true exit then
@@ -972,7 +981,7 @@ defer eval
                 begin
                     2dup cdr 2dup nil objeq? false =
                 while
-                    -2rot car over ( nextbody env exp env )
+                    -2rot car 2over ( nextbody env exp env )
                     eval
                     2drop \ discard result
                     2swap ( env nextbody )
@@ -981,8 +990,7 @@ defer eval
                 2drop ( env body )
                 car 2swap ( exp env )
 
-                ['] eval goto-prime  \ Tail call optimization
-                \ eval               \ No tail call optimization
+                R> drop ['] eval goto-deferred  \ Tail call optimization
             endof
 
             bold fg red ." Object not applicable. Aboring." reset-term cr
@@ -1030,7 +1038,8 @@ defer eval
             if-alternative
         then
 
-        2swap ['] eval goto
+        2swap
+        ['] eval goto-deferred
     then
 
     lambda? if
@@ -1058,8 +1067,6 @@ defer eval
 
 \ ---- Print ---- {{{
 
-defer print
-
 : printnum ( numobj -- ) drop 0 .R ;
 
 : printbool ( numobj -- )