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parser.py
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parser.py
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# Copyright (C) 2014 Ivan Melnikov <iv at altlinux dot org>
#
# 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.
import errno
import os
import threading
from docutils import frontend
from docutils import parsers as docutils_parser
from docutils import utils
import restructuredtext_lint as rl
class ParsedFile:
FALLBACK_ENCODING = "utf-8"
def __init__(self, filename, encoding=None, default_extension=""):
self._filename = filename
self._content = None
self._raw_content = None
self._encoding = encoding
self._doc = None
self._errors = None
self._lines = None
self._has_read = False
self._extension = os.path.splitext(filename)[1]
self._read_lock = threading.Lock()
if not self._extension:
self._extension = default_extension
@property
def errors(self):
if self._errors is not None:
return self._errors
self._errors = rl.lint(self.contents, filepath=self.filename)
return self._errors
@property
def document(self):
if self._doc is None:
# Use the rst parsers document output to do as much of the
# validation as we can without resorting to custom logic (this
# parser is what sphinx and others use anyway so it's hopefully
# mature).
parser_cls = docutils_parser.get_parser_class("rst")
parser = parser_cls()
defaults = {
"halt_level": 5,
"report_level": 5,
"quiet": True,
"file_insertion_enabled": False,
"traceback": True,
# Development use only.
"dump_settings": False,
"dump_internals": False,
"dump_transforms": False,
}
opt = frontend.OptionParser(components=[parser], defaults=defaults)
doc = utils.new_document(
source_path=self.filename, settings=opt.get_default_values()
)
parser.parse(self.contents, doc)
self._doc = doc
return self._doc
def _read(self):
if self._has_read:
return
with self._read_lock:
if not self._has_read:
with open(self.filename, "rb") as fh:
self._raw_content = fh.read()
self._lines = self._raw_content.splitlines(True)
self._has_read = True
def lines_iter(self, remove_trailing_newline=True):
self._read()
for line in self._lines:
line = str(line, encoding=self.encoding)
if remove_trailing_newline:
# Cope with various OS new line conventions
if line.endswith("\n"):
line = line[:-1]
if line.endswith("\r"):
line = line[:-1]
yield line
@property
def lines(self):
self._read()
return self._lines
@property
def extension(self):
return self._extension
@property
def filename(self):
return self._filename
@property
def encoding(self):
if not self._encoding:
self._encoding = self.FALLBACK_ENCODING
return self._encoding
@property
def raw_contents(self):
self._read()
return self._raw_content
@property
def contents(self):
if self._content is None:
self._content = str(self.raw_contents, encoding=self.encoding)
return self._content
def __str__(self):
return "{} ({}, {} chars, {} lines)".format(
self.filename,
self.encoding,
len(self.contents),
len(list(self.lines_iter())),
)
def parse(filename, encoding=None, default_extension=""):
if not os.path.isfile(filename):
raise OSError(errno.ENOENT, "File not found", filename)
return ParsedFile(filename, encoding=encoding, default_extension=default_extension)