X-Git-Url: https://thelambdalab.xyz/gitweb/index.cgi?a=blobdiff_plain;f=scheme-primitives.4th;h=a9ea386f919397377da00babfcd045367638a00d;hb=871b6800c52715e27f968bf1203e7f3144893a9c;hp=3de4d3770f7ee823f3f52e72747ce3a098f58f82;hpb=dc6e0cea1e1e982da8029c94d78ee66ab7e8fd82;p=scheme.forth.jl.git

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index 3de4d37..a9ea386 100644
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -48,7 +48,57 @@
     car primitive-type istype? -rot 2drop boolean-type
 ; make-primitive procedure?
 
-( = Arithmeic = )
+( = Type conversions = )
+
+:noname ( args -- fixnum )
+    2dup 1 ensure-arg-count
+    car character-type ensure-arg-type
+
+    drop fixnum-type
+; make-primitive char->integer
+
+:noname ( args -- char )
+    2dup 1 ensure-arg-count
+    car fixnum-type ensure-arg-type
+
+    drop character-type
+; make-primitive integer->char
+
+: build-fixnum-charlist ( num )
+    ?dup 0= if
+        [char] 0 character-type nil cons
+        exit
+    then
+
+    nil rot
+
+    begin
+        ?dup 0>
+    while
+        dup 10 mod swap 10 / swap
+        2swap rot
+        [char] 0 + character-type 2swap
+        cons
+        rot
+    repeat
+;
+
+:noname ( args -- string )
+    2dup 1 ensure-arg-count
+    car fixnum-type ensure-arg-type
+
+    drop
+
+    dup 0< swap abs ( bool num )
+    build-fixnum-charlist
+    rot if
+        [char] - character-type 2swap cons
+    then
+
+    drop string-type
+; make-primitive number->string
+
+( = Arithmetic = )
 
 : add-prim ( args -- fixnum )
     2dup nil objeq? if