adding (for lo hi f) construct, changing library funcs to use it

setting license to CPL v1

femtolisp/LICENSE

@@ -0,0 +1,214 @@
+Common Public License Version 1.0
+Fri, 2007-06-01 17:16 — nelson
+
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femtolisp/cvalues.c

@@ -130,7 +130,7 @@ value_t cvalue_from_data(value_t type, void *data, size_t sz)
 // ptr is user-managed; we don't autorelease it unless the
 // user explicitly calls (autorelease ) on the result of this function.
 // 'parent' is an optional cvalue that this pointer is known to point
-// into; UNBOUND if none.
+// into; NIL if none.
 value_t cvalue_from_ref(value_t type, void *ptr, size_t sz, value_t parent)
 {
     cvalue_t *pcv;
@@ -146,7 +146,7 @@ value_t cvalue_from_ref(value_t type, void *ptr, size_t sz, value_t parent)
     pcv->deps = NIL;
     pcv->type = POP();
     parent = POP();
-    if (parent != UNBOUND) {
+    if (parent != NIL) {
         // TODO: add dependency
     }
     cv = tagptr(pcv, TAG_BUILTIN);
@@ -178,7 +178,7 @@ value_t cvalue_string(size_t sz)
 value_t cvalue_pinned_cstring(char *str)
 {
     value_t v = cvalue_from_ref(symbol_value(stringtypesym), str, strlen(str),
-                                UNBOUND);
+                                NIL);
     ((cvalue_t*)ptr(v))->flags.cstring = 1;
     return v;
 }

femtolisp/flisp.c

@@ -20,17 +20,6 @@
   * read macros for backquote
   * symbol character-escaping printer
 
-  * new print algorithm
-     1. traverse & tag all conses to be printed. when you encounter a cons
-        that is already tagged, add it to a table to give it a #n# index
-     2. untag a cons when printing it. if cons is in the table, print
-        "#n=" before it in the car, " . #n=" in the cdr. if cons is in the
-        table but already untagged, print #n# in car or " . #n#" in the cdr.
-  * read macros for #n# and #n= using the same kind of table
-    * also need a table of read labels to translate from input indexes to
-      normalized indexes (0 for first label, 1 for next, etc.)
-  * read macro #. for eval-when-read. use for printing builtins, e.g. "#.eq"
-
   The value of this extra complexity, and what makes this fork worthy of
   the femtoLisp brand, is that the interpreter is fully "closed" in the
   sense that all representable values can be read and printed.
@@ -48,8 +37,8 @@
   * strings
   - hash tables
 
-  by Jeff Bezanson
+  by Jeff Bezanson (C) 2008
-  Public Domain
+  Distributed under the Common Public License v1.0
 */
 
 #include <stdlib.h>
@@ -76,7 +65,8 @@ static char *builtin_names[] =
       "cons", "car", "cdr", "rplaca", "rplacd",
       "eval", "apply", "set", "prog1", "raise",
       "+", "-", "*", "/", "<", "~", "&", "!", "$",
-      "vector", "aref", "aset", "length", "assoc", "compare" };
+      "vector", "aref", "aset", "length", "assoc", "compare",
+      "for" };
 
 static char *stack_bottom;
 #define PROCESS_STACK_SIZE (2*1024*1024)
@@ -651,7 +641,7 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
     symbol_t *sym;
     uint32_t saveSP, envsz, lenv;
     int i, nargs, noeval=0;
-    fixnum_t s;
+    fixnum_t s, lo, hi;
     cvalue_t *cv;
     int64_t accum;
 
@@ -1144,12 +1134,34 @@ static value_t eval_sexpr(value_t e, uint32_t penv, int tail)
             argcount("assoc", nargs, 2);
             v = assoc(Stack[SP-2], Stack[SP-1]);
             break;
+        case F_FOR:
+            argcount("for", nargs, 3);
+            lo = tofixnum(Stack[SP-3], "for");
+            hi = tofixnum(Stack[SP-2], "for");
+            f = Stack[SP-1];
+            v = car(cdr(f));
+            if (!iscons(v) || !iscons(cdr_(cdr_(f))) ||
+                cdr_(v) != NIL)
+                lerror(ArgError, "for: expected 1 argument lambda");
+            f = cdr_(f);
+            PUSH(f);  // save function cdr
+            SP += 4;  // make space
+            Stack[SP-4] = fixnum(3);       // env size
+            Stack[SP-1] = cdr_(cdr_(f));   // cloenv
+            for(s=lo; s <= hi; s++) {
+                f = Stack[SP-5];
+                Stack[SP-3] = car_(f);     // lambda list
+                Stack[SP-2] = fixnum(s);   // argument value
+                v = eval_sexpr(car_(cdr_(f)), SP-3, 0);
+            }
+            break;
         case F_SPECIAL_APPLY:
             v = Stack[saveSP-4];
             f = Stack[saveSP-5];
             PUSH(f);
             PUSH(v);
             nargs = 2;
+            // falls through!!
         case F_APPLY:
             argcount("apply", nargs, 2);
             v = Stack[saveSP] = Stack[SP-1];  // second arg is new arglist

femtolisp/flisp.h

@@ -86,7 +86,7 @@ enum {
     F_CONS, F_CAR, F_CDR, F_RPLACA, F_RPLACD,
     F_EVAL, F_APPLY, F_SET, F_PROG1, F_RAISE,
     F_ADD, F_SUB, F_MUL, F_DIV, F_LT, F_BNOT, F_BAND, F_BOR, F_BXOR,
-    F_VECTOR, F_AREF, F_ASET, F_LENGTH, F_ASSOC, F_COMPARE,
+    F_VECTOR, F_AREF, F_ASET, F_LENGTH, F_ASSOC, F_COMPARE, F_FOR,
     N_BUILTINS
 };
 #define isspecial(v) (uintval(v) <= (unsigned int)F_PROGN)

femtolisp/system.lsp

@@ -1,6 +1,6 @@
 ; femtoLisp standard library
-; by Jeff Bezanson
+; by Jeff Bezanson (C) 2008
-; Public Domain
+; Distributed under the Common Public License v1.0
 
 (set 'list (lambda args args))
 
@@ -269,22 +269,23 @@
 
 (defmacro dotimes (var . body)
   (let ((v (car var))
-        (cnt (cadr var)))
+        (cnt (cadr var))
-    (list 'let (list (list v 0))
+        (lim (gensym)))
-          (list 'while (list < v cnt)
+    `(let ((,lim (- ,cnt 1)))
-                (list prog1 (f-body body) (list 'setq v (list + v 1)))))))
+       (for 0 ,lim
+            (lambda (,v) ,(f-body body))))))
 
 (defun map-int (f n)
   (if (<= n 0)
       ()
-    (let ((first (cons (f 0) nil)))
+    (let ((first (cons (f 0) nil))
-      ((label map-int-
+          (acc nil))
-              (lambda (acc i n)
+      (setq acc first)
-                (if (= i n)
+      (for 1 (- n 1)
-                    first
+           (lambda (i)
-                  (progn (rplacd acc (cons (f i) nil))
+             (progn (rplacd acc (cons (f i) nil))
-                         (map-int- (cdr acc) (+ i 1) n)))))
+                    (setq acc (cdr acc)))))
-       first 1 n))))
+      first)))
 
 (defun iota (n) (map-int identity n))
 
@@ -403,11 +404,11 @@
 
 (defun list-to-vector (l) (apply vector l))
 (defun vector-to-list (v)
-  (let ((i (- (length v) 1))
+  (let ((n (length v))
         (l nil))
-    (while (>= i 0)
+    (for 1 n
-      (setq l (cons (aref v i) l))
+         (lambda (i)
-      (setq i (- i 1)))
+           (setq l (cons (aref v (- n i)) l))))
     l))
 
 (defun self-evaluating-p (x)

femtolisp/test.lsp

@@ -57,6 +57,18 @@
              ,(f-body body)
            (setq ,v (+ ,v 1)))))))
 
+(defun map-int (f n)
+  (if (<= n 0)
+      ()
+    (let ((first (cons (f 0) nil)))
+      ((label map-int-
+              (lambda (acc i n)
+                (if (= i n)
+                    first
+                  (progn (rplacd acc (cons (f i) nil))
+                         (map-int- (cdr acc) (+ i 1) n)))))
+       first 1 n))))
+
 (defmacro labl (name fn)
   `((lambda (,name) (setq ,name ,fn)) nil))
 

femtolisp/todo

@@ -122,6 +122,7 @@ for internal use:
    and a more efficient apply() entry point
  . disadvantage is looking through the lambda list on every lookup. maybe
    improve by making lambda lists vectors somehow?
+* fast builtin bounded iteration construct (for lo hi (lambda (x) ...))
 
 bugs:
 * with the fully recursive (simpler) relocate(), the size of cons chains
@@ -830,6 +831,19 @@ IOStream API
 *rand.uint64
 *rand.double
 
+-----------------------------------------------------------------------------
+
+  * new print algorithm
+     1. traverse & tag all conses to be printed. when you encounter a cons
+        that is already tagged, add it to a table to give it a #n# index
+     2. untag a cons when printing it. if cons is in the table, print
+        "#n=" before it in the car, " . #n=" in the cdr. if cons is in the
+        table but already untagged, print #n# in car or " . #n#" in the cdr.
+  * read macros for #n# and #n= using the same kind of table
+    * also need a table of read labels to translate from input indexes to
+      normalized indexes (0 for first label, 1 for next, etc.)
+  * read macro #. for eval-when-read. use for printing builtins, e.g. "#.eq"
+
 -----------------------------------------------------------------------------
 
 prettyprint notes