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"""Defines parser helpers."""
from mozilla_version.errors import MissingFieldError
def get_value_matched_by_regex(field_name, regex_matches, string):
"""Ensure value stored in regex group exists."""
try:
value = regex_matches.group(field_name)
if value is not None:
return value
except IndexError:
pass
raise MissingFieldError(string, field_name)
def does_regex_have_group(regex_matches, group_name):
"""Return a boolean depending on whether a regex group is matched."""
try:
return regex_matches.group(group_name) is not None
except IndexError:
return False
def positive_int(val):
"""Parse `val` into a positive integer."""
if isinstance(val, float):
raise ValueError('"{}" must not be a float'.format(val))
val = int(val)
if val >= 0:
return val
raise ValueError('"{}" must be positive'.format(val))
def positive_int_or_none(val):
"""Parse `val` into either `None` or a positive integer."""
if val is None:
return val
return positive_int(val)
def strictly_positive_int_or_none(val):
"""Parse `val` into either `None` or a strictly positive integer."""
val = positive_int_or_none(val)
if val is None or val > 0:
return val
raise ValueError('"{}" must be strictly positive'.format(val))
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