1 files changed, 132 insertions, 0 deletions
diff --git a/prelude.lisp b/prelude.lisp
new file mode 100644
index 0000000..a1be068
--- /dev/null
+++ b/prelude.lisp
@@ -0,0 +1,132 @@
+(defvar nil '())
+
+(defvar pi 3.1415926)
+(defvar e 2.718281828)
+
+(defmacro incq (i)
+  `(setq ,i (+ ,i 1)))
+
+(defmacro decq (i)
+  `(setq ,i (- ,i 1)))
+
+(defun zero? (x) (= x 0))
+(defun plus? (x) (> x 0))
+(defun minus? (x) (< x 0))
+
+(defmacro when (pred . body)
+  `(if ,pred
+     (progn ,@body)
+     nil))
+
+(defmacro unless (pred . body)
+  `(if ,pred
+     nil
+     (progn ,@body)))
+
+(defun take (n lst)
+  (unless (integer? n)
+    (error "take: type error."))
+  (unless (list? lst)
+    (error "take: type error."))
+  (let ((i 0)
+        (newlst nil))
+    (while (and (< i n)
+                (not (null? lst)))
+      (setq newlst (cons (car lst) newlst))
+      (setq lst (cdr lst))
+      (incq i))
+    (nreverse newlst)))
+
+(defun drop (n lst)
+  (unless (integer? n)
+    (error "drop type error."))
+  (unless (list? lst)
+    (error "drop: type error."))
+  (let ((i 0))
+    (while (and (< i n)
+                (not (null? lst)))
+      (setq lst (cdr lst))
+      (incq i))
+    lst))
+
+(defun take-while (pred lst)
+  (unless (function? pred)
+    (error "take-while: type error."))
+  (unless (list? lst)
+    (error "take-while: type error."))
+  (let ((newlst nil))
+    (while (and (not (null? lst))
+                (funcall pred (car lst)))
+      (setq newlst (cons (car lst) newlst))
+      (setq lst (cdr lst)))
+    (nreverse newlst)))
+
+(defun drop-while (pred lst)
+  (unless (function? pred)
+    (error "drop-while: type error."))
+  (unless (list? lst)
+    (error "drop-while: type error."))
+  (while (and (not (null? lst))
+              (funcall pred (car lst)))
+    (setq lst (cdr lst)))
+  lst)
+
+(defun sublist (start end lst)
+  (unless (integer? start)
+    (error "sublist: type error."))
+  (unless (integer? end)
+    (error "sublist: type error."))
+  (unless (< start end)
+    (error "sublist: start must less than end."))
+  (unless (list? lst)
+    (error "sublist: type error."))
+  (drop start (take end lst)))
+
+(defun find (x lst)
+  (unless (list? lst)
+    (error "find: type error."))
+  (while (not (null? lst))
+    (when (equal? x (car lst))
+      (return lst))
+    (setq lst (cdr lst)))
+  nil)
+
+(defun contains? (x lst)
+  (unless (list? lst)
+    (error "contains?: type error."))
+  (while (not (null? lst))
+    (when (equal? x (car lst))
+      (return #t))
+    (setq lst (cdr lst)))
+  #f)
+
+(defun caar (x) (car (car x)))
+(defun cadr (x) (car (cdr x)))
+(defun cddr (x) (cdr (cdr x)))
+(defun cdar (x) (cdr (car x)))
+
+(defun caaar (x) (car (caar x)))
+(defun cadar (x) (car (cdar x)))
+(defun cddar (x) (cdr (cdar x)))
+(defun cdaar (x) (cdr (caar x)))
+(defun caadr (x) (car (cadr x)))
+(defun caddr (x) (car (cddr x)))
+(defun cdddr (x) (cdr (cddr x)))
+(defun cdadr (x) (cdr (cadr x)))
+
+(defun caaaar (x) (car (caaar x)))
+(defun cadaar (x) (car (cdaar x)))
+(defun cddaar (x) (cdr (cdaar x)))
+(defun cdaaar (x) (cdr (caaar x)))
+(defun caadar (x) (car (cadar x)))
+(defun caddar (x) (car (cddar x)))
+(defun cdddar (x) (cdr (cddar x)))
+(defun cdadar (x) (cdr (cadar x)))
+(defun caaadr (x) (car (caadr x)))
+(defun cadadr (x) (car (cdadr x)))
+(defun cddadr (x) (cdr (cdadr x)))
+(defun cdaadr (x) (cdr (caadr x)))
+(defun caaddr (x) (car (caddr x)))
+(defun cadddr (x) (car (cdddr x)))
+(defun cddddr (x) (cdr (cdddr x)))
+(defun cdaddr (x) (cdr (caddr x)))