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empty_values.py
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empty_values.py
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# Copyright (C) 2017 Greg Dubicki
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Use this rule to prevent nodes with empty content, that implicitly result in
``null`` values.
.. rubric:: Options
* Use ``forbid-in-block-mappings`` to prevent empty values in block mappings.
* Use ``forbid-in-flow-mappings`` to prevent empty values in flow mappings.
.. rubric:: Default values (when enabled)
.. code-block:: yaml
rules:
empty-values:
forbid-in-block-mappings: true
forbid-in-flow-mappings: true
.. rubric:: Examples
#. With ``empty-values: {forbid-in-block-mappings: true}``
the following code snippets would **PASS**:
::
some-mapping:
sub-element: correctly indented
::
explicitly-null: null
the following code snippets would **FAIL**:
::
some-mapping:
sub-element: incorrectly indented
::
implicitly-null:
#. With ``empty-values: {forbid-in-flow-mappings: true}``
the following code snippet would **PASS**:
::
{prop: null}
{a: 1, b: 2, c: 3}
the following code snippets would **FAIL**:
::
{prop: }
::
{a: 1, b:, c: 3}
"""
import yaml
from yamllint.linter import LintProblem
ID = 'empty-values'
TYPE = 'token'
CONF = {'forbid-in-block-mappings': bool,
'forbid-in-flow-mappings': bool}
DEFAULT = {'forbid-in-block-mappings': True,
'forbid-in-flow-mappings': True}
def check(conf, token, prev, next, nextnext, context):
if conf['forbid-in-block-mappings']:
if isinstance(token, yaml.ValueToken) and isinstance(next, (
yaml.KeyToken, yaml.BlockEndToken)):
yield LintProblem(token.start_mark.line + 1,
token.end_mark.column + 1,
'empty value in block mapping')
if conf['forbid-in-flow-mappings']:
if isinstance(token, yaml.ValueToken) and isinstance(next, (
yaml.FlowEntryToken, yaml.FlowMappingEndToken)):
yield LintProblem(token.start_mark.line + 1,
token.end_mark.column + 1,
'empty value in flow mapping')