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# Copyright (c) 2016, Will Thames and contributors
# Copyright (c) 2018, Ansible Project
import re
from ansiblelint.rules import AnsibleLintRule
class ComparisonToEmptyStringRule(AnsibleLintRule):
id = '602'
shortdesc = "Don't compare to empty string"
description = (
'Use ``when: var|length > 0`` rather than ``when: var != ""`` (or '
'conversely ``when: var|length == 0`` rather than ``when: var == ""``)'
)
severity = 'HIGH'
tags = ['idiom']
version_added = 'v4.0.0'
empty_string_compare = re.compile("[=!]= ?(\"{2}|'{2})")
def match(self, file, line):
return self.empty_string_compare.search(line)
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