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Update bundled coverage.py to version 4.2.0

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Dmitry Trofimov
2016-10-18 21:09:33 +02:00
parent 59bbcccc61
commit e784e6fed1
42 changed files with 6223 additions and 3804 deletions
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python/helpers/coveragepy/coverage/plugin.py Normal file
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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://bitbucket.org/ned/coveragepy/src/default/NOTICE.txt
"""Plugin interfaces for coverage.py"""
from coverage import files
from coverage.misc import contract, _needs_to_implement
class CoveragePlugin(object):
"""Base class for coverage.py plugins.
To write a coverage.py plugin, create a module with a subclass of
:class:`CoveragePlugin`. You will override methods in your class to
participate in various aspects of coverage.py's processing.
Currently the only plugin type is a file tracer, for implementing
measurement support for non-Python files. File tracer plugins implement
the :meth:`file_tracer` method to claim files and the :meth:`file_reporter`
method to report on those files.
Any plugin can optionally implement :meth:`sys_info` to provide debugging
information about their operation.
Coverage.py will store its own information on your plugin object, using
attributes whose names start with ``_coverage_``. Don't be startled.
To register your plugin, define a function called `coverage_init` in your
module::
def coverage_init(reg, options):
reg.add_file_tracer(MyPlugin())
You use the `reg` parameter passed to your `coverage_init` function to
register your plugin object. It has one method, `add_file_tracer`, which
takes a newly created instance of your plugin.
If your plugin takes options, the `options` parameter is a dictionary of
your plugin's options from the coverage.py configuration file. Use them
however you want to configure your object before registering it.
"""
def file_tracer(self, filename): # pylint: disable=unused-argument
"""Get a :class:`FileTracer` object for a file.
Every Python source file is offered to the plugin to give it a chance
to take responsibility for tracing the file. If your plugin can handle
the file, then return a :class:`FileTracer` object. Otherwise return
None.
There is no way to register your plugin for particular files. Instead,
this method is invoked for all files, and the plugin 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 plugin.
The file name will be a Python file being executed. There are two
broad categories of behavior for a plugin, depending on the kind of
files your plugin supports:
* Static file names: each of your original source files has been
converted into a distinct Python file. Your plugin 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 plugin 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 plugin 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.
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 sys_info(self):
"""Get a list of information useful for debugging.
This method will be invoked for ``--debug=sys``. Your
plugin 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.
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 plugin
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 plugins 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.
See :ref:`howitworks` for details of the different coverage.py phases.
`FileReporter` objects should only be created in the
: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.
"""
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 plugin 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 plugin 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 plugin 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 plugin 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 plugin 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 plugin...
"""
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