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"""Python source expertise for coverage.py"""
import os.path
import sys
import tokenize
import zipimport
from coverage.backward import unicode_class
from coverage.codeunit import CodeUnit
from coverage.misc import NoSource
from coverage.parser import PythonParser
from coverage.phystokens import source_token_lines, source_encoding
def read_python_source(filename):
"""Read the Python source text from `filename`.
Returns a str: unicode on Python 3, bytes on Python 2.
"""
# Python 3.2 provides `tokenize.open`, the best way to open source files.
if sys.version_info >= (3, 2):
f = tokenize.open(filename)
else:
f = open(filename, "rU")
with f:
return f.read()
def get_python_source(filename):
"""Return the source code, as a str."""
base, ext = os.path.splitext(filename)
if ext == ".py" and sys.platform == "win32":
exts = [".py", ".pyw"]
else:
exts = [ext]
for ext in exts:
try_filename = base + ext
if os.path.exists(try_filename):
# A regular text file: open it.
source = read_python_source(try_filename)
break
# Maybe it's in a zip file?
source = get_zip_bytes(try_filename)
if source is not None:
if sys.version_info >= (3, 0):
source = source.decode(source_encoding(source))
break
else:
# Couldn't find source.
raise NoSource("No source for code: '%s'." % filename)
# Python code should always end with a line with a newline.
if source and source[-1] != '\n':
source += '\n'
return source
def get_zip_bytes(filename):
"""Get data from `filename` if it is a zip file path.
Returns the bytestring data read from the zip file, or None if no zip file
could be found or `filename` isn't in it. The data returned will be
an empty string if the file is empty.
"""
markers = ['.zip'+os.sep, '.egg'+os.sep]
for marker in markers:
if marker in filename:
parts = filename.split(marker)
try:
zi = zipimport.zipimporter(parts[0]+marker[:-1])
except zipimport.ZipImportError:
continue
try:
data = zi.get_data(parts[1])
except IOError:
continue
assert isinstance(data, bytes)
return data
return None
class PythonCodeUnit(CodeUnit):
"""Represents a Python file."""
def __init__(self, morf, file_locator=None):
super(PythonCodeUnit, self).__init__(morf, file_locator)
self._source = None
def _adjust_filename(self, fname):
# .pyc files should always refer to a .py instead.
if fname.endswith(('.pyc', '.pyo')):
fname = fname[:-1]
elif fname.endswith('$py.class'): # Jython
fname = fname[:-9] + ".py"
return fname
def source(self):
if self._source is None:
self._source = get_python_source(self.filename)
if sys.version_info < (3, 0):
encoding = source_encoding(self._source)
self._source = self._source.decode(encoding, "replace")
assert isinstance(self._source, unicode_class)
return self._source
def get_parser(self, exclude=None):
return PythonParser(filename=self.filename, exclude=exclude)
def should_be_python(self):
"""Does it seem like this file should contain Python?
This is used to decide if a file reported as part of the execution of
a program was really likely to have contained Python in the first
place.
"""
# Get the file extension.
_, ext = os.path.splitext(self.filename)
# Anything named *.py* should be Python.
if ext.startswith('.py'):
return True
# A file with no extension should be Python.
if not ext:
return True
# Everything else is probably not Python.
return False
def source_token_lines(self):
return source_token_lines(self.source())
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