def parse_file(cls, filename):
rcps = cls()
with open(filename) as f:
for (lineno, line) in enumerate(f, 1):
line = line.rstrip("\r\n")
if line.startswith("#") or line.strip() == "":
continue
try:
recipe = Recipe.parse_line(line)
except ParseError:
raise Exception("Could not parse recipe on line %d." %
(lineno))
rcps.add(recipe)
return rcps
