# validators.py Portage File Loader Code
# Copyright 2007 Gentoo Foundation

from portage.dep import isvalidatom

ValidAtomValidator = isvalidatom

def PackagesFileValidator(atom):
	""" This function mutates atoms that begin with - or *
	    It then checks to see if that atom is valid, and if
	    so returns True, else it returns False.
	    
	    Args:
		atom: a string representing an atom such as sys-apps/portage-2.1
	"""
	if atom.startswith("*") or atom.startswith("-"):
		atom = atom[1:]
	if not isvalidatom(atom):
		return False
	return True