Add coverage

tools/telemetry/third_party/coverage/coverage/python.py

Index: tools/telemetry/third_party/coverage/coverage/python.py
diff --git a/tools/telemetry/third_party/coverage/coverage/python.py b/tools/telemetry/third_party/coverage/coverage/python.py
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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
+
+"""Python source expertise for coverage.py"""
+
+import os.path
+import zipimport
+
+from coverage import env, files
+from coverage.misc import contract, expensive, NoSource, join_regex
+from coverage.parser import PythonParser
+from coverage.phystokens import source_token_lines, source_encoding
+from coverage.plugin import FileReporter
+
+
+@contract(returns='bytes')
+def read_python_source(filename):
+    """Read the Python source text from `filename`.
+
+    Returns bytes.
+
+    """
+    with open(filename, "rb") as f:
+        return f.read().replace(b"\r\n", b"\n").replace(b"\r", b"\n")
+
+
+@contract(returns='unicode')
+def get_python_source(filename):
+    """Return the source code, as unicode."""
+    base, ext = os.path.splitext(filename)
+    if ext == ".py" and env.WINDOWS:
+        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:
+            break
+    else:
+        # Couldn't find source.
+        raise NoSource("No source for code: '%s'." % filename)
+
+    source = source.decode(source_encoding(source), "replace")
+
+    # Python code should always end with a line with a newline.
+    if source and source[-1] != '\n':
+        source += '\n'
+
+    return source
+
+
+@contract(returns='bytes|None')
+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
+            return data
+    return None
+
+
+class PythonFileReporter(FileReporter):
+    """Report support for a Python file."""
+
+    def __init__(self, morf, coverage=None):
+        self.coverage = coverage
+
+        if hasattr(morf, '__file__'):
+            filename = morf.__file__
+        else:
+            filename = morf
+
+        # .pyc files should always refer to a .py instead.
+        if filename.endswith(('.pyc', '.pyo')):
+            filename = filename[:-1]
+        elif filename.endswith('$py.class'):   # Jython
+            filename = filename[:-9] + ".py"
+
+        super(PythonFileReporter, self).__init__(files.canonical_filename(filename))
+
+        if hasattr(morf, '__name__'):
+            name = morf.__name__
+            name = name.replace(".", os.sep) + ".py"
+        else:
+            name = files.relative_filename(filename)
+        self.relname = name
+
+        self._source = None
+        self._parser = None
+        self._statements = None
+        self._excluded = None
+
+    def relative_filename(self):
+        return self.relname
+
+    @property
+    def parser(self):
+        """Lazily create a :class:`PythonParser`."""
+        if self._parser is None:
+            self._parser = PythonParser(
+                filename=self.filename,
+                exclude=self.coverage._exclude_regex('exclude'),
+            )
+        return self._parser
+
+    @expensive
+    def lines(self):
+        """Return the line numbers of statements in the file."""
+        if self._statements is None:
+            self._statements, self._excluded = self.parser.parse_source()
+        return self._statements
+
+    @expensive
+    def excluded_lines(self):
+        """Return the line numbers of statements in the file."""
+        if self._excluded is None:
+            self._statements, self._excluded = self.parser.parse_source()
+        return self._excluded
+
+    def translate_lines(self, lines):
+        return self.parser.translate_lines(lines)
+
+    def translate_arcs(self, arcs):
+        return self.parser.translate_arcs(arcs)
+
+    @expensive
+    def no_branch_lines(self):
+        no_branch = self.parser.lines_matching(
+            join_regex(self.coverage.config.partial_list),
+            join_regex(self.coverage.config.partial_always_list)
+            )
+        return no_branch
+
+    @expensive
+    def arcs(self):
+        return self.parser.arcs()
+
+    @expensive
+    def exit_counts(self):
+        return self.parser.exit_counts()
+
+    @contract(returns='unicode')
+    def source(self):
+        if self._source is None:
+            self._source = get_python_source(self.filename)
+        return self._source
+
+    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())