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# Copyright (C) 2010 Chris Jerdonek (cjerdonek@webkit.org)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND ANY
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
# ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Defines style error handler classes.
A style error handler is a function to call when a style error is
found. Style error handlers can also have state. A class that represents
a style error handler should implement the following methods.
Methods:
__call__(self, line_number, category, confidence, message):
Handle the occurrence of a style error.
Check whether the error is reportable. If so, increment the total
error count and report the details. Note that error reporting can
be suppressed after reaching a certain number of reports.
Args:
line_number: The integer line number of the line containing the error.
category: The name of the category of the error, for example
"whitespace/newline".
confidence: An integer between 1 and 5 inclusive that represents the
application's level of confidence in the error. The value
5 means that we are certain of the problem, and the
value 1 means that it could be a legitimate construct.
message: The error message to report.
"""
import sys
class DefaultStyleErrorHandler(object):
"""The default style error handler."""
def __init__(self, file_path, configuration, increment_error_count,
line_numbers=None):
"""Create a default style error handler.
Args:
file_path: The path to the file containing the error. This
is used for reporting to the user.
configuration: A StyleProcessorConfiguration instance.
increment_error_count: A function that takes no arguments and
increments the total count of reportable
errors.
line_numbers: An array of line numbers of the lines for which
style errors should be reported, or None if errors
for all lines should be reported. When it is not
None, this array normally contains the line numbers
corresponding to the modified lines of a patch.
"""
if line_numbers is not None:
line_numbers = set(line_numbers)
self._file_path = file_path
self._configuration = configuration
self._increment_error_count = increment_error_count
self._line_numbers = line_numbers
# A string to integer dictionary cache of the number of reportable
# errors per category passed to this instance.
self._category_totals = {}
# Useful for unit testing.
def __eq__(self, other):
"""Return whether this instance is equal to another."""
if self._configuration != other._configuration:
return False
if self._file_path != other._file_path:
return False
if self._increment_error_count != other._increment_error_count:
return False
if self._line_numbers != other._line_numbers:
return False
return True
# Useful for unit testing.
def __ne__(self, other):
# Python does not automatically deduce __ne__ from __eq__.
return not self.__eq__(other)
def _add_reportable_error(self, category):
"""Increment the error count and return the new category total."""
self._increment_error_count() # Increment the total.
# Increment the category total.
if not category in self._category_totals:
self._category_totals[category] = 1
else:
self._category_totals[category] += 1
return self._category_totals[category]
def _max_reports(self, category):
"""Return the maximum number of errors to report."""
if not category in self._configuration.max_reports_per_category:
return None
return self._configuration.max_reports_per_category[category]
def __call__(self, line_number, category, confidence, message):
"""Handle the occurrence of a style error.
See the docstring of this module for more information.
"""
if (self._line_numbers is not None and
line_number not in self._line_numbers):
# Then the error occurred in a line that was not modified, so
# the error is not reportable.
return
if not self._configuration.is_reportable(category=category,
confidence_in_error=confidence,
file_path=self._file_path):
return
category_total = self._add_reportable_error(category)
max_reports = self._max_reports(category)
if (max_reports is not None) and (category_total > max_reports):
# Then suppress displaying the error.
return
self._configuration.write_style_error(category=category,
confidence_in_error=confidence,
file_path=self._file_path,
line_number=line_number,
message=message)
if category_total == max_reports:
self._configuration.stderr_write("Suppressing further [%s] reports "
"for this file.\n" % category)
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