# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

from collections import defaultdict
import fnmatch
import json
import os
import re
import subprocess
import sys

# TODO(dcheng): It's kind of horrible that this is copy and pasted from
# presubmit_canned_checks.py, but it's far easier than any of the alternatives.
def _ReportErrorFileAndLine(filename, line_num, dummy_line):
"""Default error formatter for _FindNewViolationsOfRule."""
return '%s:%s' % (filename, line_num)


class MockCannedChecks(object):
def _FindNewViolationsOfRule(self, callable_rule, input_api,
source_file_filter=None,
error_formatter=_ReportErrorFileAndLine):
"""Find all newly introduced violations of a per-line rule (a callable).

Arguments:
callable_rule: a callable taking a file extension and line of input and
returning True if the rule is satisfied and False if there was a
problem.
input_api: object to enumerate the affected files.
source_file_filter: a filter to be passed to the input api.
error_formatter: a callable taking (filename, line_number, line) and
returning a formatted error string.

Returns:
A list of the newly-introduced violations reported by the rule.
"""
errors = []
for f in input_api.AffectedFiles(include_deletes=False,
file_filter=source_file_filter):
# For speed, we do two passes, checking first the full file. Shelling out
# to the SCM to determine the changed region can be quite expensive on
# Win32. Assuming that most files will be kept problem-free, we can
# skip the SCM operations most of the time.
extension = str(f.LocalPath()).rsplit('.', 1)[-1]
if all(callable_rule(extension, line) for line in f.NewContents()):
continue # No violation found in full text: can skip considering diff.

for line_num, line in f.ChangedContents():
if not callable_rule(extension, line):
errors.append(error_formatter(f.LocalPath(), line_num, line))

return errors


class MockInputApi(object):
"""Mock class for the InputApi class.

This class can be used for unittests for presubmit by initializing the files
attribute as the list of changed files.
"""

DEFAULT_FILES_TO_SKIP = ()

def __init__(self):
self.canned_checks = MockCannedChecks()
self.fnmatch = fnmatch
self.json = json
self.re = re
self.os_path = os.path
self.platform = sys.platform
self.python_executable = sys.executable
self.platform = sys.platform
self.subprocess = subprocess
self.sys = sys
self.files = []
self.is_committing = False
self.change = MockChange([])
self.presubmit_local_path = os.path.dirname(__file__)

def CreateMockFileInPath(self, f_list):
self.os_path.exists = lambda x: x in f_list

def AffectedFiles(self, file_filter=None, include_deletes=False):
for file in self.files:
if file_filter and not file_filter(file):
continue
if not include_deletes and file.Action() == 'D':
continue
yield file

def AffectedSourceFiles(self, file_filter=None):
return self.AffectedFiles(file_filter=file_filter)

def FilterSourceFile(self, file,
files_to_check=(), files_to_skip=()):
local_path = file.LocalPath()
found_in_files_to_check = not files_to_check
if files_to_check:
if type(files_to_check) is str:
raise TypeError('files_to_check should be an iterable of strings')
for pattern in files_to_check:
compiled_pattern = re.compile(pattern)
if compiled_pattern.search(local_path):
found_in_files_to_check = True
break
if files_to_skip:
if type(files_to_skip) is str:
raise TypeError('files_to_skip should be an iterable of strings')
for pattern in files_to_skip:
compiled_pattern = re.compile(pattern)
if compiled_pattern.search(local_path):
return False
return found_in_files_to_check

def LocalPaths(self):
return [file.LocalPath() for file in self.files]

def PresubmitLocalPath(self):
return self.presubmit_local_path

def ReadFile(self, filename, mode='rU'):
if hasattr(filename, 'AbsoluteLocalPath'):
filename = filename.AbsoluteLocalPath()
for file_ in self.files:
if file_.LocalPath() == filename:
return '\n'.join(file_.NewContents())
# Otherwise, file is not in our mock API.
raise IOError, "No such file or directory: '%s'" % filename


class MockOutputApi(object):
"""Mock class for the OutputApi class.

An instance of this class can be passed to presubmit unittests for outputing
various types of results.
"""

class PresubmitResult(object):
def __init__(self, message, items=None, long_text=''):
self.message = message
self.items = items
self.long_text = long_text

def __repr__(self):
return self.message

class PresubmitError(PresubmitResult):
def __init__(self, message, items=None, long_text=''):
MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
self.type = 'error'

class PresubmitPromptWarning(PresubmitResult):
def __init__(self, message, items=None, long_text=''):
MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
self.type = 'warning'

class PresubmitNotifyResult(PresubmitResult):
def __init__(self, message, items=None, long_text=''):
MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
self.type = 'notify'

class PresubmitPromptOrNotify(PresubmitResult):
def __init__(self, message, items=None, long_text=''):
MockOutputApi.PresubmitResult.__init__(self, message, items, long_text)
self.type = 'promptOrNotify'

def __init__(self):
self.more_cc = []

def AppendCC(self, more_cc):
self.more_cc.extend(more_cc)


class MockFile(object):
"""Mock class for the File class.

This class can be used to form the mock list of changed files in
MockInputApi for presubmit unittests.
"""

def __init__(self, local_path, new_contents, old_contents=None, action='A',
scm_diff=None):
self._local_path = local_path
self._new_contents = new_contents
self._changed_contents = [(i + 1, l) for i, l in enumerate(new_contents)]
self._action = action
if scm_diff:
self._scm_diff = scm_diff
else:
self._scm_diff = (
"--- /dev/null\n+++ %s\n@@ -0,0 +1,%d @@\n" %
(local_path, len(new_contents)))
for l in new_contents:
self._scm_diff += "+%s\n" % l
self._old_contents = old_contents

def Action(self):
return self._action

def ChangedContents(self):
return self._changed_contents

def NewContents(self):
return self._new_contents

def LocalPath(self):
return self._local_path

def AbsoluteLocalPath(self):
return self._local_path

def GenerateScmDiff(self):
return self._scm_diff

def OldContents(self):
return self._old_contents

def rfind(self, p):
"""os.path.basename is called on MockFile so we need an rfind method."""
return self._local_path.rfind(p)

def __getitem__(self, i):
"""os.path.basename is called on MockFile so we need a get method."""
return self._local_path[i]

def __len__(self):
"""os.path.basename is called on MockFile so we need a len method."""
return len(self._local_path)

def replace(self, altsep, sep):
"""os.path.basename is called on MockFile so we need a replace method."""
return self._local_path.replace(altsep, sep)


class MockAffectedFile(MockFile):
def AbsoluteLocalPath(self):
return self._local_path


class MockChange(object):
"""Mock class for Change class.

This class can be used in presubmit unittests to mock the query of the
current change.
"""

def __init__(self, changed_files):
self._changed_files = changed_files
self.footers = defaultdict(list)

def LocalPaths(self):
return self._changed_files

def AffectedFiles(self, include_dirs=False, include_deletes=True,
file_filter=None):
return self._changed_files

def GitFootersFromDescription(self):
return self.footers