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import os
import re
import textwrap
from sybil import Region, Example, Document
from testfixtures import diff
FILEBLOCK_START = re.compile(r'^\.\.\s*topic::?\s*(.+)\b', re.MULTILINE)
FILEBLOCK_END = re.compile(r'(\n\Z|\n(?=\S))')
CLASS = re.compile(r'\s+:class:\s*(read|write)-file')
class FileBlock(object):
def __init__(self, path, content, action):
self.path, self.content, self.action = path, content, action
class FileParser(object):
"""
A `Sybil <http://sybil.readthedocs.io>`__ parser that
parses certain ReST sections to read and write files in the
configured :class:`~testfixtures.TempDirectory`.
:param name: This is the name of the :class:`~testfixtures.TempDirectory` to use
in the Sybil test namespace.
"""
def __init__(self, name: str):
self.name = name
def __call__(self, document: Document):
for start_match, end_match, source in document.find_region_sources(
FILEBLOCK_START, FILEBLOCK_END
):
lines = source.splitlines()
class_ = CLASS.match(lines[1])
if not class_:
continue
index = 3
if lines[index].strip() == '::':
index += 1
source = textwrap.dedent('\n'.join(lines[index:])).lstrip()
if source[-1] != '\n':
source += '\n'
parsed = FileBlock(
path=start_match.group(1),
content=source,
action=class_.group(1)
)
yield Region(
start_match.start(),
end_match.end(),
parsed,
self.evaluate
)
def evaluate(self, example: Example):
block: FileBlock = example.parsed
dir = example.namespace[self.name]
if block.action == 'read':
actual = dir.read(block.path, 'ascii').replace(os.linesep, '\n')
if actual != block.content:
return diff(
block.content,
actual,
'File %r, line %i:' % (example.path, example.line),
'Reading from "%s":' % dir.as_string(block.path)
)
if block.action == 'write':
dir.write(block.path, block.content, 'ascii')