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(define-module (language python range)
#:use-module (oop pf-objects)
#:use-module (language python exceptions)
#:use-module (language python number)
#:use-module (language python list)
#:use-module (language python yield)
#:use-module (language python try)
#:use-module (language python persist)
#:export (range))
(define-python-class range ()
(define __init__
(case-lambda
((self n)
(let ((n (py-index n)))
(set self '_a 0)
(set self '_b (max 0 n))
(set self '_c 1)))
((self n m)
(let ((n (py-index n))
(m (py-index m)))
(set self '_a n)
(set self '_b (max m n))
(set self '_c 1)))
((self n m k)
(let ((n (py-index n))
(m (py-index m))
(k (py-index k)))
(cond
((= k 0)
(raise TypeError "range does not allow 0 as a step"))
((> k 0)
(set self '_a n)
(set self '_b (if (< m n) n m))
(set self '_c k))
((< k 0)
(set self '_a n)
(set self '_b (if (> m n) n m))
(set self '_c k)))))))
(define __iter__
(lambda (self)
((make-generator ()
(lambda (yield)
(let* ((a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c))
(aa (if (> c 0) a (- a 1)))
(op (if (> c 0) < >)))
(let lp ((i aa))
(if (op i b)
(begin
(yield i)
(lp (+ i c)))))))))))
(define __reversed__
(lambda (self)
(__getslice__ self None None -1)))
(define __repr__
(lambda (self)
(format #f "range(~a,~a,~a)"
(ref self '_a)
(ref self '_b)
(ref self '_c))))
(define __contains__
(lambda (self x)
(let ((x (py-index x ))
(a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c)))
(if (> c 0)
(and
(>= x a)
(< x b)
(= (modulo (- x a) c) 0))
(and
(<= x a)
(> x b)
(= (modulo (- x a) c) 0))))))
(define __getitem__
(lambda (self x)
(let* ((x (py-index x))
(a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c))
(m (+ a (* c x))))
(if (> c 0)
(if (and (>= x 0)
(< m b))
m
(raise IndexError "getitem out of range"))
(if (and (<= x 0)
(> m b))
m
(raise IndexError "getitem out of range"))))))
(define __min__
(lambda (self)
(let* ((a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c))
(n (abs (py-floordiv (- a b) c))))
(if (> c 0)
a
(+ a (* c (- n 1)))))))
(define __max__
(lambda (self)
(let* ((a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c))
(n (abs (py-floordiv (- a b) c))))
(if (> c 0)
(+ a (* c (- n 1)))
n))))
(define __len__
(lambda (self)
(let* ((a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c)))
(abs (py-floordiv (- a b) c)))))
(define __getslice__
(lambda (self x y z)
(let* ((a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c))
(x (if (eq? x None) None (py-index x)))
(y (if (eq? y None) None (py-index y)))
(z (if (eq? z None) None (py-index z)))
(n (abs (py-floordiv (- a b) c))))
(if (or (eq? z None) (> (* z c) 0))
(begin
(if (eq? z 'None) (set! z 1))
(if (eq? y 'None) (set! y n))
(if (eq? x 'None) (set! x 0))
(if (< x 0) (set! x 0))
(if (> x n) (set! x n))
(if (< y 0) (set! y 0))
(if (> y n) (set! y n))
(let* ((cc (* c z))
(xx (+ a (* c x)))
(yy (+ a (* c y)))
(aa (min xx yy))
(bb (max xx yy)))
(range aa bb cc)))
(begin
(if (eq? y 'None) (set! y 0))
(if (eq? x 'None) (set! x n))
(if (< x 0) (set! x 0))
(if (> x n) (set! x n))
(if (< y 0) (set! y 0))
(if (> y n) (set! y n))
(let* ((cc (* c z))
(xx (+ a (* c x)))
(yy (+ a (* c y)))
(aa (max xx yy))
(bb (min xx yy)))
(range aa bb cc)))))))
(define __index__
(case-lambda
((self x)
(let ((x (py-index x ))
(a (ref self '_a))
(b (ref self '_b))
(c (ref self '_c)))
(if (> c 0)
(if (and
(>= x a)
(< x b)
(= (modulo (- x a) c) 0))
(py-floordiv (- x a) c)
(raise IndexError))
(if (and
(<= x a)
(> x b)
(= (modulo (- x a) c) 0))
(py-floordiv (- x a) c)
(raise IndexError)))))
((self x i)
(py-index (pylist-slice None i 1) x))
((self x i j)
(py-index (pylist-slice i j 1) x))))
(define __count__
(lambda (self i)
(if (__contains__ self i)
1
0))))
(name-object range)
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