mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-18 10:50:40 +00:00
483 lines
16 KiB
Python
483 lines
16 KiB
Python
# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
|
|
# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
|
|
|
|
"""
|
|
.. versionadded:: 4.0
|
|
|
|
Plug-in interfaces for coverage.py.
|
|
|
|
Coverage.py supports a few different kinds of plug-ins that change its
|
|
behavior:
|
|
|
|
* File tracers implement tracing of non-Python file types.
|
|
|
|
* Configurers add custom configuration, using Python code to change the
|
|
configuration.
|
|
|
|
To write a coverage.py plug-in, create a module with a subclass of
|
|
:class:`~coverage.CoveragePlugin`. You will override methods in your class to
|
|
participate in various aspects of coverage.py's processing.
|
|
Different types of plug-ins have to override different methods.
|
|
|
|
Any plug-in can optionally implement :meth:`~coverage.CoveragePlugin.sys_info`
|
|
to provide debugging information about their operation.
|
|
|
|
Your module must also contain a ``coverage_init`` function that registers an
|
|
instance of your plug-in class::
|
|
|
|
import coverage
|
|
|
|
class MyPlugin(coverage.CoveragePlugin):
|
|
...
|
|
|
|
def coverage_init(reg, options):
|
|
reg.add_file_tracer(MyPlugin())
|
|
|
|
You use the `reg` parameter passed to your ``coverage_init`` function to
|
|
register your plug-in object. The registration method you call depends on
|
|
what kind of plug-in it is.
|
|
|
|
If your plug-in takes options, the `options` parameter is a dictionary of your
|
|
plug-in's options from the coverage.py configuration file. Use them however
|
|
you want to configure your object before registering it.
|
|
|
|
Coverage.py will store its own information on your plug-in object, using
|
|
attributes whose names start with ``_coverage_``. Don't be startled.
|
|
|
|
.. warning::
|
|
Plug-ins are imported by coverage.py before it begins measuring code.
|
|
If you write a plugin in your own project, it might import your product
|
|
code before coverage.py can start measuring. This can result in your
|
|
own code being reported as missing.
|
|
|
|
One solution is to put your plugins in your project tree, but not in
|
|
your importable Python package.
|
|
|
|
|
|
File Tracers
|
|
============
|
|
|
|
File tracers implement measurement support for non-Python files. File tracers
|
|
implement the :meth:`~coverage.CoveragePlugin.file_tracer` method to claim
|
|
files and the :meth:`~coverage.CoveragePlugin.file_reporter` method to report
|
|
on those files.
|
|
|
|
In your ``coverage_init`` function, use the ``add_file_tracer`` method to
|
|
register your file tracer.
|
|
|
|
|
|
Configurers
|
|
===========
|
|
|
|
.. versionadded:: 4.5
|
|
|
|
Configurers modify the configuration of coverage.py during start-up.
|
|
Configurers implement the :meth:`~coverage.CoveragePlugin.configure` method to
|
|
change the configuration.
|
|
|
|
In your ``coverage_init`` function, use the ``add_configurer`` method to
|
|
register your configurer.
|
|
|
|
"""
|
|
|
|
from coverage import files
|
|
from coverage.misc import contract, _needs_to_implement
|
|
|
|
|
|
class CoveragePlugin(object):
|
|
"""Base class for coverage.py plug-ins."""
|
|
|
|
def file_tracer(self, filename): # pylint: disable=unused-argument
|
|
"""Get a :class:`FileTracer` object for a file.
|
|
|
|
Plug-in type: file tracer.
|
|
|
|
Every Python source file is offered to your plug-in to give it a chance
|
|
to take responsibility for tracing the file. If your plug-in can
|
|
handle the file, then return a :class:`FileTracer` object. Otherwise
|
|
return None.
|
|
|
|
There is no way to register your plug-in for particular files.
|
|
Instead, this method is invoked for all files, and the plug-in decides
|
|
whether it can trace the file or not. Be prepared for `filename` to
|
|
refer to all kinds of files that have nothing to do with your plug-in.
|
|
|
|
The file name will be a Python file being executed. There are two
|
|
broad categories of behavior for a plug-in, depending on the kind of
|
|
files your plug-in supports:
|
|
|
|
* Static file names: each of your original source files has been
|
|
converted into a distinct Python file. Your plug-in is invoked with
|
|
the Python file name, and it maps it back to its original source
|
|
file.
|
|
|
|
* Dynamic file names: all of your source files are executed by the same
|
|
Python file. In this case, your plug-in implements
|
|
:meth:`FileTracer.dynamic_source_filename` to provide the actual
|
|
source file for each execution frame.
|
|
|
|
`filename` is a string, the path to the file being considered. This is
|
|
the absolute real path to the file. If you are comparing to other
|
|
paths, be sure to take this into account.
|
|
|
|
Returns a :class:`FileTracer` object to use to trace `filename`, or
|
|
None if this plug-in cannot trace this file.
|
|
|
|
"""
|
|
return None
|
|
|
|
def file_reporter(self, filename): # pylint: disable=unused-argument
|
|
"""Get the :class:`FileReporter` class to use for a file.
|
|
|
|
Plug-in type: file tracer.
|
|
|
|
This will only be invoked if `filename` returns non-None from
|
|
:meth:`file_tracer`. It's an error to return None from this method.
|
|
|
|
Returns a :class:`FileReporter` object to use to report on `filename`.
|
|
|
|
"""
|
|
_needs_to_implement(self, "file_reporter")
|
|
|
|
def find_executable_files(self, src_dir): # pylint: disable=unused-argument
|
|
"""Yield all of the executable files in `src_dir`, recursively.
|
|
|
|
Plug-in type: file tracer.
|
|
|
|
Executability is a plug-in-specific property, but generally means files
|
|
which would have been considered for coverage analysis, had they been
|
|
included automatically.
|
|
|
|
Returns or yields a sequence of strings, the paths to files that could
|
|
have been executed, including files that had been executed.
|
|
|
|
"""
|
|
return []
|
|
|
|
def configure(self, config):
|
|
"""Modify the configuration of coverage.py.
|
|
|
|
Plug-in type: configurer.
|
|
|
|
This method is called during coverage.py start-up, to give your plug-in
|
|
a chance to change the configuration. The `config` parameter is an
|
|
object with :meth:`~coverage.Coverage.get_option` and
|
|
:meth:`~coverage.Coverage.set_option` methods. Do not call any other
|
|
methods on the `config` object.
|
|
|
|
"""
|
|
pass
|
|
|
|
def sys_info(self):
|
|
"""Get a list of information useful for debugging.
|
|
|
|
Plug-in type: any.
|
|
|
|
This method will be invoked for ``--debug=sys``. Your
|
|
plug-in can return any information it wants to be displayed.
|
|
|
|
Returns a list of pairs: `[(name, value), ...]`.
|
|
|
|
"""
|
|
return []
|
|
|
|
|
|
class FileTracer(object):
|
|
"""Support needed for files during the execution phase.
|
|
|
|
File tracer plug-ins implement subclasses of FileTracer to return from
|
|
their :meth:`~CoveragePlugin.file_tracer` method.
|
|
|
|
You may construct this object from :meth:`CoveragePlugin.file_tracer` any
|
|
way you like. A natural choice would be to pass the file name given to
|
|
`file_tracer`.
|
|
|
|
`FileTracer` objects should only be created in the
|
|
:meth:`CoveragePlugin.file_tracer` method.
|
|
|
|
See :ref:`howitworks` for details of the different coverage.py phases.
|
|
|
|
"""
|
|
|
|
def source_filename(self):
|
|
"""The source file name for this file.
|
|
|
|
This may be any file name you like. A key responsibility of a plug-in
|
|
is to own the mapping from Python execution back to whatever source
|
|
file name was originally the source of the code.
|
|
|
|
See :meth:`CoveragePlugin.file_tracer` for details about static and
|
|
dynamic file names.
|
|
|
|
Returns the file name to credit with this execution.
|
|
|
|
"""
|
|
_needs_to_implement(self, "source_filename")
|
|
|
|
def has_dynamic_source_filename(self):
|
|
"""Does this FileTracer have dynamic source file names?
|
|
|
|
FileTracers can provide dynamically determined file names by
|
|
implementing :meth:`dynamic_source_filename`. Invoking that function
|
|
is expensive. To determine whether to invoke it, coverage.py uses the
|
|
result of this function to know if it needs to bother invoking
|
|
:meth:`dynamic_source_filename`.
|
|
|
|
See :meth:`CoveragePlugin.file_tracer` for details about static and
|
|
dynamic file names.
|
|
|
|
Returns True if :meth:`dynamic_source_filename` should be called to get
|
|
dynamic source file names.
|
|
|
|
"""
|
|
return False
|
|
|
|
def dynamic_source_filename(self, filename, frame): # pylint: disable=unused-argument
|
|
"""Get a dynamically computed source file name.
|
|
|
|
Some plug-ins need to compute the source file name dynamically for each
|
|
frame.
|
|
|
|
This function will not be invoked if
|
|
:meth:`has_dynamic_source_filename` returns False.
|
|
|
|
Returns the source file name for this frame, or None if this frame
|
|
shouldn't be measured.
|
|
|
|
"""
|
|
return None
|
|
|
|
def line_number_range(self, frame):
|
|
"""Get the range of source line numbers for a given a call frame.
|
|
|
|
The call frame is examined, and the source line number in the original
|
|
file is returned. The return value is a pair of numbers, the starting
|
|
line number and the ending line number, both inclusive. For example,
|
|
returning (5, 7) means that lines 5, 6, and 7 should be considered
|
|
executed.
|
|
|
|
This function might decide that the frame doesn't indicate any lines
|
|
from the source file were executed. Return (-1, -1) in this case to
|
|
tell coverage.py that no lines should be recorded for this frame.
|
|
|
|
"""
|
|
lineno = frame.f_lineno
|
|
return lineno, lineno
|
|
|
|
|
|
class FileReporter(object):
|
|
"""Support needed for files during the analysis and reporting phases.
|
|
|
|
File tracer plug-ins implement a subclass of `FileReporter`, and return
|
|
instances from their :meth:`CoveragePlugin.file_reporter` method.
|
|
|
|
There are many methods here, but only :meth:`lines` is required, to provide
|
|
the set of executable lines in the file.
|
|
|
|
See :ref:`howitworks` for details of the different coverage.py phases.
|
|
|
|
"""
|
|
|
|
def __init__(self, filename):
|
|
"""Simple initialization of a `FileReporter`.
|
|
|
|
The `filename` argument is the path to the file being reported. This
|
|
will be available as the `.filename` attribute on the object. Other
|
|
method implementations on this base class rely on this attribute.
|
|
|
|
"""
|
|
self.filename = filename
|
|
|
|
def __repr__(self):
|
|
return "<{0.__class__.__name__} filename={0.filename!r}>".format(self)
|
|
|
|
def relative_filename(self):
|
|
"""Get the relative file name for this file.
|
|
|
|
This file path will be displayed in reports. The default
|
|
implementation will supply the actual project-relative file path. You
|
|
only need to supply this method if you have an unusual syntax for file
|
|
paths.
|
|
|
|
"""
|
|
return files.relative_filename(self.filename)
|
|
|
|
@contract(returns='unicode')
|
|
def source(self):
|
|
"""Get the source for the file.
|
|
|
|
Returns a Unicode string.
|
|
|
|
The base implementation simply reads the `self.filename` file and
|
|
decodes it as UTF8. Override this method if your file isn't readable
|
|
as a text file, or if you need other encoding support.
|
|
|
|
"""
|
|
with open(self.filename, "rb") as f:
|
|
return f.read().decode("utf8")
|
|
|
|
def lines(self):
|
|
"""Get the executable lines in this file.
|
|
|
|
Your plug-in must determine which lines in the file were possibly
|
|
executable. This method returns a set of those line numbers.
|
|
|
|
Returns a set of line numbers.
|
|
|
|
"""
|
|
_needs_to_implement(self, "lines")
|
|
|
|
def excluded_lines(self):
|
|
"""Get the excluded executable lines in this file.
|
|
|
|
Your plug-in can use any method it likes to allow the user to exclude
|
|
executable lines from consideration.
|
|
|
|
Returns a set of line numbers.
|
|
|
|
The base implementation returns the empty set.
|
|
|
|
"""
|
|
return set()
|
|
|
|
def translate_lines(self, lines):
|
|
"""Translate recorded lines into reported lines.
|
|
|
|
Some file formats will want to report lines slightly differently than
|
|
they are recorded. For example, Python records the last line of a
|
|
multi-line statement, but reports are nicer if they mention the first
|
|
line.
|
|
|
|
Your plug-in can optionally define this method to perform these kinds
|
|
of adjustment.
|
|
|
|
`lines` is a sequence of integers, the recorded line numbers.
|
|
|
|
Returns a set of integers, the adjusted line numbers.
|
|
|
|
The base implementation returns the numbers unchanged.
|
|
|
|
"""
|
|
return set(lines)
|
|
|
|
def arcs(self):
|
|
"""Get the executable arcs in this file.
|
|
|
|
To support branch coverage, your plug-in needs to be able to indicate
|
|
possible execution paths, as a set of line number pairs. Each pair is
|
|
a `(prev, next)` pair indicating that execution can transition from the
|
|
`prev` line number to the `next` line number.
|
|
|
|
Returns a set of pairs of line numbers. The default implementation
|
|
returns an empty set.
|
|
|
|
"""
|
|
return set()
|
|
|
|
def no_branch_lines(self):
|
|
"""Get the lines excused from branch coverage in this file.
|
|
|
|
Your plug-in can use any method it likes to allow the user to exclude
|
|
lines from consideration of branch coverage.
|
|
|
|
Returns a set of line numbers.
|
|
|
|
The base implementation returns the empty set.
|
|
|
|
"""
|
|
return set()
|
|
|
|
def translate_arcs(self, arcs):
|
|
"""Translate recorded arcs into reported arcs.
|
|
|
|
Similar to :meth:`translate_lines`, but for arcs. `arcs` is a set of
|
|
line number pairs.
|
|
|
|
Returns a set of line number pairs.
|
|
|
|
The default implementation returns `arcs` unchanged.
|
|
|
|
"""
|
|
return arcs
|
|
|
|
def exit_counts(self):
|
|
"""Get a count of exits from that each line.
|
|
|
|
To determine which lines are branches, coverage.py looks for lines that
|
|
have more than one exit. This function creates a dict mapping each
|
|
executable line number to a count of how many exits it has.
|
|
|
|
To be honest, this feels wrong, and should be refactored. Let me know
|
|
if you attempt to implement this method in your plug-in...
|
|
|
|
"""
|
|
return {}
|
|
|
|
def missing_arc_description(self, start, end, executed_arcs=None): # pylint: disable=unused-argument
|
|
"""Provide an English sentence describing a missing arc.
|
|
|
|
The `start` and `end` arguments are the line numbers of the missing
|
|
arc. Negative numbers indicate entering or exiting code objects.
|
|
|
|
The `executed_arcs` argument is a set of line number pairs, the arcs
|
|
that were executed in this file.
|
|
|
|
By default, this simply returns the string "Line {start} didn't jump
|
|
to {end}".
|
|
|
|
"""
|
|
return "Line {start} didn't jump to line {end}".format(start=start, end=end)
|
|
|
|
def source_token_lines(self):
|
|
"""Generate a series of tokenized lines, one for each line in `source`.
|
|
|
|
These tokens are used for syntax-colored reports.
|
|
|
|
Each line is a list of pairs, each pair is a token::
|
|
|
|
[('key', 'def'), ('ws', ' '), ('nam', 'hello'), ('op', '('), ... ]
|
|
|
|
Each pair has a token class, and the token text. The token classes
|
|
are:
|
|
|
|
* ``'com'``: a comment
|
|
* ``'key'``: a keyword
|
|
* ``'nam'``: a name, or identifier
|
|
* ``'num'``: a number
|
|
* ``'op'``: an operator
|
|
* ``'str'``: a string literal
|
|
* ``'txt'``: some other kind of text
|
|
|
|
If you concatenate all the token texts, and then join them with
|
|
newlines, you should have your original source back.
|
|
|
|
The default implementation simply returns each line tagged as
|
|
``'txt'``.
|
|
|
|
"""
|
|
for line in self.source().splitlines():
|
|
yield [('txt', line)]
|
|
|
|
# Annoying comparison operators. Py3k wants __lt__ etc, and Py2k needs all
|
|
# of them defined.
|
|
|
|
def __eq__(self, other):
|
|
return isinstance(other, FileReporter) and self.filename == other.filename
|
|
|
|
def __ne__(self, other):
|
|
return not (self == other)
|
|
|
|
def __lt__(self, other):
|
|
return self.filename < other.filename
|
|
|
|
def __le__(self, other):
|
|
return self.filename <= other.filename
|
|
|
|
def __gt__(self, other):
|
|
return self.filename > other.filename
|
|
|
|
def __ge__(self, other):
|
|
return self.filename >= other.filename
|
|
|
|
__hash__ = None # This object doesn't need to be hashed.
|