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"""Implementation of empty-string-compare rule."""
# Copyright (c) 2016, Will Thames and contributors
# Copyright (c) 2018, Ansible Project
from __future__ import annotations
import re
import sys
from typing import TYPE_CHECKING
from ansiblelint.rules import AnsibleLintRule
from ansiblelint.yaml_utils import nested_items_path
if TYPE_CHECKING:
from ansiblelint.file_utils import Lintable
from ansiblelint.utils import Task
class ComparisonToEmptyStringRule(AnsibleLintRule):
"""Don't compare to empty string."""
id = "empty-string-compare"
description = (
'Use ``when: var|length > 0`` rather than ``when: var != ""`` (or '
'conversely ``when: var|length == 0`` rather than ``when: var == ""``)'
)
severity = "HIGH"
tags = ["idiom", "opt-in"]
version_added = "v4.0.0"
empty_string_compare = re.compile("[=!]= ?(\"{2}|'{2})")
def matchtask(
self,
task: Task,
file: Lintable | None = None,
) -> bool | str:
for k, v, _ in nested_items_path(task):
if k == "when":
if isinstance(v, str):
if self.empty_string_compare.search(v):
return True
elif isinstance(v, bool):
pass
else:
for item in v:
if isinstance(item, str) and self.empty_string_compare.search(
item,
):
return True
return False
# testing code to be loaded only with pytest or when executed the rule file
if "pytest" in sys.modules:
from ansiblelint.rules import RulesCollection
from ansiblelint.runner import Runner
def test_rule_empty_string_compare_fail() -> None:
"""Test rule matches."""
rules = RulesCollection()
rules.register(ComparisonToEmptyStringRule())
results = Runner(
"examples/playbooks/rule-empty-string-compare-fail.yml",
rules=rules,
).run()
assert len(results) == 3
for result in results:
assert result.message == ComparisonToEmptyStringRule().shortdesc
def test_rule_empty_string_compare_pass() -> None:
"""Test rule matches."""
rules = RulesCollection()
rules.register(ComparisonToEmptyStringRule())
results = Runner(
"examples/playbooks/rule-empty-string-compare-pass.yml",
rules=rules,
).run()
assert len(results) == 0, results
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