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

diff --git a/scheme-primitives.4th b/scheme-primitives.4th
index 3de4d37..b268051 100644 (file)
--- a/scheme-primitives.4th
+++ b/scheme-primitives.4th
@@ -48,7 +48,89 @@
     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
+
+: num-to-charlist ( num -- charlist )
+    ?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 )
+    num-to-charlist
+    rot if
+        [char] - character-type 2swap cons
+    then
+
+    drop string-type
+; make-primitive number->string
+
+:noname ( args -- symbol )
+    2dup 1 ensure-arg-count
+    car string-type ensure-arg-type
+
+    drop pair-type
+
+    2dup car [char] - character-type objeq? if
+        cdr
+        true -rot
+    else
+        2dup car [char] + character-type objeq? if
+            cdr
+        then
+        false -rot
+    then
+
+    0 -rot
+    begin
+        2dup nil objeq? false =
+    while
+        2dup car drop [char] 0 - -rot
+        2swap swap 10 * + -rot
+        cdr
+    repeat
+
+    2drop
+
+    swap if -1 * then
+
+    fixnum-type
+; make-primitive string->number
+
+( = Arithmetic = )
 
 : add-prim ( args -- fixnum )
     2dup nil objeq? if