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# Copyright 2015 Google Inc. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Interface to file resources.
This module provides functions for interfacing with files: opening, writing, and
querying.
"""
import fnmatch
import os
import re
from lib2to3.pgen2 import tokenize
from yapf.yapflib import errors
from yapf.yapflib import py3compat
from yapf.yapflib import style
CR = '\r'
LF = '\n'
CRLF = '\r\n'
def GetDefaultStyleForDir(dirname):
"""Return default style name for a given directory.
Looks for .style.yapf or setup.cfg in the parent directories.
Arguments:
dirname: (unicode) The name of the directory.
Returns:
The filename if found, otherwise return the global default (pep8).
"""
dirname = os.path.abspath(dirname)
while True:
# See if we have a .style.yapf file.
style_file = os.path.join(dirname, style.LOCAL_STYLE)
if os.path.exists(style_file):
return style_file
# See if we have a setup.cfg file with a '[yapf]' section.
config_file = os.path.join(dirname, style.SETUP_CONFIG)
if os.path.exists(config_file):
with open(config_file) as fd:
config = py3compat.ConfigParser()
config.read_file(fd)
if config.has_section('yapf'):
return config_file
dirname = os.path.dirname(dirname)
if (not dirname or not os.path.basename(dirname) or
dirname == os.path.abspath(os.path.sep)):
break
global_file = os.path.expanduser(style.GLOBAL_STYLE)
if os.path.exists(global_file):
return global_file
return style.DEFAULT_STYLE
def GetCommandLineFiles(command_line_file_list, recursive, exclude):
"""Return the list of files specified on the command line."""
return _FindPythonFiles(command_line_file_list, recursive, exclude)
def WriteReformattedCode(filename,
reformatted_code,
encoding='',
in_place=False):
"""Emit the reformatted code.
Write the reformatted code into the file, if in_place is True. Otherwise,
write to stdout.
Arguments:
filename: (unicode) The name of the unformatted file.
reformatted_code: (unicode) The reformatted code.
encoding: (unicode) The encoding of the file.
in_place: (bool) If True, then write the reformatted code to the file.
"""
if in_place:
with py3compat.open_with_encoding(
filename, mode='w', encoding=encoding, newline='') as fd:
fd.write(reformatted_code)
else:
py3compat.EncodeAndWriteToStdout(reformatted_code)
def LineEnding(lines):
"""Retrieve the line ending of the original source."""
endings = {CRLF: 0, CR: 0, LF: 0}
for line in lines:
if line.endswith(CRLF):
endings[CRLF] += 1
elif line.endswith(CR):
endings[CR] += 1
elif line.endswith(LF):
endings[LF] += 1
return (sorted(endings, key=endings.get, reverse=True) or [LF])[0]
def _FindPythonFiles(filenames, recursive, exclude):
"""Find all Python files."""
if exclude and any(e.startswith('./') for e in exclude):
raise errors.YapfError("path in '--exclude' should not start with ./")
python_files = []
for filename in filenames:
if filename != '.' and exclude and IsIgnored(filename, exclude):
continue
if os.path.isdir(filename):
if recursive:
# TODO(morbo): Look into a version of os.walk that can handle recursion.
excluded_dirs = []
for dirpath, _, filelist in os.walk(filename):
if dirpath != '.' and exclude and IsIgnored(dirpath, exclude):
excluded_dirs.append(dirpath)
continue
elif any(dirpath.startswith(e) for e in excluded_dirs):
continue
for f in filelist:
filepath = os.path.join(dirpath, f)
if exclude and IsIgnored(filepath, exclude):
continue
if IsPythonFile(filepath):
python_files.append(filepath)
else:
raise errors.YapfError(
"directory specified without '--recursive' flag: %s" % filename)
elif os.path.isfile(filename):
python_files.append(filename)
return python_files
def IsIgnored(path, exclude):
"""Return True if filename matches any patterns in exclude."""
path = path.lstrip('/')
while path.startswith('./'):
path = path[2:]
return any(fnmatch.fnmatch(path, e.rstrip('/')) for e in exclude)
def IsPythonFile(filename):
"""Return True if filename is a Python file."""
if os.path.splitext(filename)[1] == '.py':
return True
try:
with open(filename, 'rb') as fd:
encoding = tokenize.detect_encoding(fd.readline)[0]
# Check for correctness of encoding.
with py3compat.open_with_encoding(
filename, mode='r', encoding=encoding) as fd:
fd.read()
except UnicodeDecodeError:
encoding = 'latin-1'
except (IOError, SyntaxError):
# If we fail to detect encoding (or the encoding cookie is incorrect - which
# will make detect_encoding raise SyntaxError), assume it's not a Python
# file.
return False
try:
with py3compat.open_with_encoding(
filename, mode='r', encoding=encoding) as fd:
first_line = fd.readline(256)
except IOError:
return False
return re.match(r'^#!.*\bpython[23]?\b', first_line)
def FileEncoding(filename):
"""Return the file's encoding."""
with open(filename, 'rb') as fd:
return tokenize.detect_encoding(fd.readline)[0]
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