Add python coverage module to third_party

third_party/pycoverage/coverage/__init__.py

Index: third_party/pycoverage/coverage/__init__.py
diff --git a/third_party/pycoverage/coverage/__init__.py b/third_party/pycoverage/coverage/__init__.py
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+++ b/third_party/pycoverage/coverage/__init__.py
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+"""Code coverage measurement for Python.
+
+Ned Batchelder
+http://nedbatchelder.com/code/coverage
+
+"""
+
+from coverage.version import __version__, __url__
+
+from coverage.control import coverage, process_startup
+from coverage.data import CoverageData
+from coverage.cmdline import main, CoverageScript
+from coverage.misc import CoverageException
+
+# Module-level functions.  The original API to this module was based on
+# functions defined directly in the module, with a singleton of the coverage()
+# class.  That design hampered programmability, so the current api uses
+# explicitly-created coverage objects.  But for backward compatibility, here we
+# define the top-level functions to create the singleton when they are first
+# called.
+
+# Singleton object for use with module-level functions.  The singleton is
+# created as needed when one of the module-level functions is called.
+_the_coverage = None
+
+def _singleton_method(name):
+    """Return a function to the `name` method on a singleton `coverage` object.
+
+    The singleton object is created the first time one of these functions is
+    called.
+
+    """
+    # Disable pylint msg W0612, because a bunch of variables look unused, but
+    # they're accessed via locals().
+    # pylint: disable=W0612
+
+    def wrapper(*args, **kwargs):
+        """Singleton wrapper around a coverage method."""
+        global _the_coverage
+        if not _the_coverage:
+            _the_coverage = coverage(auto_data=True)
+        return getattr(_the_coverage, name)(*args, **kwargs)
+
+    import inspect
+    meth = getattr(coverage, name)
+    args, varargs, kw, defaults = inspect.getargspec(meth)
+    argspec = inspect.formatargspec(args[1:], varargs, kw, defaults)
+    docstring = meth.__doc__
+    wrapper.__doc__ = ("""\
+        A first-use-singleton wrapper around coverage.%(name)s.
+
+        This wrapper is provided for backward compatibility with legacy code.
+        New code should use coverage.%(name)s directly.
+
+        %(name)s%(argspec)s:
+
+        %(docstring)s
+        """ % locals()
+        )
+
+    return wrapper
+
+
+# Define the module-level functions.
+use_cache = _singleton_method('use_cache')
+start =     _singleton_method('start')
+stop =      _singleton_method('stop')
+erase =     _singleton_method('erase')
+exclude =   _singleton_method('exclude')
+analysis =  _singleton_method('analysis')
+analysis2 = _singleton_method('analysis2')
+report =    _singleton_method('report')
+annotate =  _singleton_method('annotate')
+
+
+# On Windows, we encode and decode deep enough that something goes wrong and
+# the encodings.utf_8 module is loaded and then unloaded, I don't know why.
+# Adding a reference here prevents it from being unloaded.  Yuk.
+import encodings.utf_8
+
+# Because of the "from coverage.control import fooey" lines at the top of the
+# file, there's an entry for coverage.coverage in sys.modules, mapped to None.
+# This makes some inspection tools (like pydoc) unable to find the class
+# coverage.coverage.  So remove that entry.
+import sys
+try:
+    del sys.modules['coverage.coverage']
+except KeyError:
+    pass
+
+
+# COPYRIGHT AND LICENSE
+#
+# Copyright 2001 Gareth Rees.  All rights reserved.
+# Copyright 2004-2013 Ned Batchelder.  All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+#
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the
+#    distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# HOLDERS AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+# TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+# USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+# DAMAGE.