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128 lines
4.1 KiB
Python
128 lines
4.1 KiB
Python
"""Statistic collection logic for Flake8."""
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import collections
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class Statistics(object):
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"""Manager of aggregated statistics for a run of Flake8."""
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def __init__(self):
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"""Initialize the underlying dictionary for our statistics."""
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self._store = {}
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def error_codes(self):
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"""Return all unique error codes stored.
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:returns:
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Sorted list of error codes.
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:rtype:
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list(str)
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"""
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return sorted({key.code for key in self._store})
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def record(self, error):
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"""Add the fact that the error was seen in the file.
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:param error:
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The Violation instance containing the information about the
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violation.
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:type error:
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flake8.style_guide.Violation
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"""
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key = Key.create_from(error)
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if key not in self._store:
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self._store[key] = Statistic.create_from(error)
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self._store[key].increment()
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def statistics_for(self, prefix, filename=None):
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"""Generate statistics for the prefix and filename.
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If you have a :class:`Statistics` object that has recorded errors,
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you can generate the statistics for a prefix (e.g., ``E``, ``E1``,
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``W50``, ``W503``) with the optional filter of a filename as well.
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.. code-block:: python
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>>> stats = Statistics()
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>>> stats.statistics_for('E12',
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filename='src/flake8/statistics.py')
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<generator ...>
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>>> stats.statistics_for('W')
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<generator ...>
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:param str prefix:
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The error class or specific error code to find statistics for.
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:param str filename:
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(Optional) The filename to further filter results by.
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:returns:
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Generator of instances of :class:`Statistic`
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"""
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matching_errors = sorted(
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key for key in self._store if key.matches(prefix, filename)
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)
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for error_code in matching_errors:
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yield self._store[error_code]
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class Key(collections.namedtuple("Key", ["filename", "code"])):
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"""Simple key structure for the Statistics dictionary.
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To make things clearer, easier to read, and more understandable, we use a
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namedtuple here for all Keys in the underlying dictionary for the
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Statistics object.
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"""
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__slots__ = ()
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@classmethod
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def create_from(cls, error):
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"""Create a Key from :class:`flake8.style_guide.Violation`."""
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return cls(filename=error.filename, code=error.code)
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def matches(self, prefix, filename):
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"""Determine if this key matches some constraints.
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:param str prefix:
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The error code prefix that this key's error code should start with.
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:param str filename:
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The filename that we potentially want to match on. This can be
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None to only match on error prefix.
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:returns:
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True if the Key's code starts with the prefix and either filename
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is None, or the Key's filename matches the value passed in.
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:rtype:
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bool
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"""
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return self.code.startswith(prefix) and (
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filename is None or self.filename == filename
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)
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class Statistic(object):
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"""Simple wrapper around the logic of each statistic.
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Instead of maintaining a simple but potentially hard to reason about
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tuple, we create a namedtuple which has attributes and a couple
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convenience methods on it.
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"""
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def __init__(self, error_code, filename, message, count):
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"""Initialize our Statistic."""
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self.error_code = error_code
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self.filename = filename
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self.message = message
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self.count = count
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@classmethod
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def create_from(cls, error):
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"""Create a Statistic from a :class:`flake8.style_guide.Violation`."""
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return cls(
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error_code=error.code,
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filename=error.filename,
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message=error.text,
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count=0,
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)
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def increment(self):
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"""Increment the number of times we've seen this error in this file."""
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self.count += 1
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