###########################################
#
#  Loop Construct Tests
#
#  Tests boundary conditions using `if`
#  and `while` with simple and synthetic
#  comparison operators.
#  Should draw 5 vertical strips of 6 boxes.
#
###########################################

: main
	# while with pseudo-op
	v0 := 0
	v1 := 0
	loop
		while v1 < 30
		sprite v0 v1 5
		v1 += 5
	again

	# while with simple comparison
	v0 := 5
	v1 := 0
	loop
		while v1 != 30
		sprite v0 v1 5
		v1 += 5
	again

	# if with pseudo-op
	v0 := 10
	v1 := 0
	loop
		if v1 >= 30 then jump done1
		sprite v0 v1 5
		v1 += 5
	again
	: done1

	# if with simple comparison
	v0 := 15
	v1 := 0
	loop
		if v1 == 30 then jump done2
		sprite v0 v1 5
		v1 += 5
	again
	: done2

	# nested loops with while
	v0 := 20
	v1 := 0
	loop
		while v1 != 25
		sprite v0 v1 5
		v1 += 5
		v2 := 5
		loop
			v2 += -1
			if v2 != 0 then
		again
	again
	sprite v0 v1 5

	loop again