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data.py
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data.py
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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Coverage data for coverage.py.
This file had the 4.x JSON data support, which is now gone. This file still
has storage-agnostic helpers, and is kept to avoid changing too many imports.
CoverageData is now defined in sqldata.py, and imported here to keep the
imports working.
"""
import glob
import os.path
from coverage.exceptions import CoverageException, NoDataError
from coverage.misc import file_be_gone, human_sorted, plural
from coverage.sqldata import CoverageData
def line_counts(data, fullpath=False):
"""Return a dict summarizing the line coverage data.
Keys are based on the file names, and values are the number of executed
lines. If `fullpath` is true, then the keys are the full pathnames of
the files, otherwise they are the basenames of the files.
Returns a dict mapping file names to counts of lines.
"""
summ = {}
if fullpath:
# pylint: disable=unnecessary-lambda-assignment
filename_fn = lambda f: f
else:
filename_fn = os.path.basename
for filename in data.measured_files():
summ[filename_fn(filename)] = len(data.lines(filename))
return summ
def add_data_to_hash(data, filename, hasher):
"""Contribute `filename`'s data to the `hasher`.
`hasher` is a `coverage.misc.Hasher` instance to be updated with
the file's data. It should only get the results data, not the run
data.
"""
if data.has_arcs():
hasher.update(sorted(data.arcs(filename) or []))
else:
hasher.update(sorted(data.lines(filename) or []))
hasher.update(data.file_tracer(filename))
def combinable_files(data_file, data_paths=None):
"""Make a list of data files to be combined.
`data_file` is a path to a data file. `data_paths` is a list of files or
directories of files.
Returns a list of absolute file paths.
"""
data_dir, local = os.path.split(os.path.abspath(data_file))
data_paths = data_paths or [data_dir]
files_to_combine = []
for p in data_paths:
if os.path.isfile(p):
files_to_combine.append(os.path.abspath(p))
elif os.path.isdir(p):
pattern = os.path.join(os.path.abspath(p), f"{local}.*")
files_to_combine.extend(glob.glob(pattern))
else:
raise NoDataError(f"Couldn't combine from non-existent path '{p}'")
return files_to_combine
def combine_parallel_data(
data, aliases=None, data_paths=None, strict=False, keep=False, message=None,
):
"""Combine a number of data files together.
`data` is a CoverageData.
Treat `data.filename` as a file prefix, and combine the data from all
of the data files starting with that prefix plus a dot.
If `aliases` is provided, it's a `PathAliases` object that is used to
re-map paths to match the local machine's.
If `data_paths` is provided, it is a list of directories or files to
combine. Directories are searched for files that start with
`data.filename` plus dot as a prefix, and those files are combined.
If `data_paths` is not provided, then the directory portion of
`data.filename` is used as the directory to search for data files.
Unless `keep` is True every data file found and combined is then deleted from disk. If a file
cannot be read, a warning will be issued, and the file will not be
deleted.
If `strict` is true, and no files are found to combine, an error is
raised.
"""
files_to_combine = combinable_files(data.base_filename(), data_paths)
if strict and not files_to_combine:
raise NoDataError("No data to combine")
files_combined = 0
for f in files_to_combine:
if f == data.data_filename():
# Sometimes we are combining into a file which is one of the
# parallel files. Skip that file.
if data._debug.should('dataio'):
data._debug.write(f"Skipping combining ourself: {f!r}")
continue
if data._debug.should('dataio'):
data._debug.write(f"Combining data file {f!r}")
try:
new_data = CoverageData(f, debug=data._debug)
new_data.read()
except CoverageException as exc:
if data._warn:
# The CoverageException has the file name in it, so just
# use the message as the warning.
data._warn(str(exc))
else:
data.update(new_data, aliases=aliases)
files_combined += 1
if message:
try:
message(f"Combined data file {os.path.relpath(f)}")
except ValueError:
# ValueError can be raised under Windows when os.getcwd() returns a
# folder from a different drive than the drive of f, in which case
# we print the original value of f instead of its relative path
message(f"Combined data file {f!r}")
if not keep:
if data._debug.should('dataio'):
data._debug.write(f"Deleting combined data file {f!r}")
file_be_gone(f)
if strict and not files_combined:
raise NoDataError("No usable data files")
def debug_data_file(filename):
"""Implementation of 'coverage debug data'."""
data = CoverageData(filename)
filename = data.data_filename()
print(f"path: {filename}")
if not os.path.exists(filename):
print("No data collected: file doesn't exist")
return
data.read()
print(f"has_arcs: {data.has_arcs()!r}")
summary = line_counts(data, fullpath=True)
filenames = human_sorted(summary.keys())
nfiles = len(filenames)
print(f"{nfiles} file{plural(nfiles)}:")
for f in filenames:
line = f"{f}: {summary[f]} line{plural(summary[f])}"
plugin = data.file_tracer(f)
if plugin:
line += f" [{plugin}]"
print(line)