Add python coverage 3.7 to depot tools.

third_party/coverage/config.py

Index: third_party/coverage/config.py
diff --git a/third_party/coverage/config.py b/third_party/coverage/config.py
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+"""Config file for coverage.py"""
+
+import os, re, sys
+from coverage.backward import string_class, iitems
+
+# In py3, # ConfigParser was renamed to the more-standard configparser
+try:
+    import configparser                             # pylint: disable=F0401
+except ImportError:
+    import ConfigParser as configparser
+
+
+class HandyConfigParser(configparser.RawConfigParser):
+    """Our specialization of ConfigParser."""
+
+    def read(self, filename):
+        """Read a filename as UTF-8 configuration data."""
+        kwargs = {}
+        if sys.version_info >= (3, 2):
+            kwargs['encoding'] = "utf-8"
+        return configparser.RawConfigParser.read(self, filename, **kwargs)
+
+    def get(self, *args, **kwargs):
+        v = configparser.RawConfigParser.get(self, *args, **kwargs)
+        def dollar_replace(m):
+            """Called for each $replacement."""
+            # Only one of the groups will have matched, just get its text.
+            word = [w for w in m.groups() if w is not None][0]
+            if word == "$":
+                return "$"
+            else:
+                return os.environ.get(word, '')
+
+        dollar_pattern = r"""(?x)   # Use extended regex syntax
+            \$(?:                   # A dollar sign, then
+            (?P<v1>\w+) |           #   a plain word,
+            {(?P<v2>\w+)} |         #   or a {-wrapped word,
+            (?P<char>[$])           #   or a dollar sign.
+            )
+            """
+        v = re.sub(dollar_pattern, dollar_replace, v)
+        return v
+
+    def getlist(self, section, option):
+        """Read a list of strings.
+
+        The value of `section` and `option` is treated as a comma- and newline-
+        separated list of strings.  Each value is stripped of whitespace.
+
+        Returns the list of strings.
+
+        """
+        value_list = self.get(section, option)
+        values = []
+        for value_line in value_list.split('\n'):
+            for value in value_line.split(','):
+                value = value.strip()
+                if value:
+                    values.append(value)
+        return values
+
+    def getlinelist(self, section, option):
+        """Read a list of full-line strings.
+
+        The value of `section` and `option` is treated as a newline-separated
+        list of strings.  Each value is stripped of whitespace.
+
+        Returns the list of strings.
+
+        """
+        value_list = self.get(section, option)
+        return list(filter(None, value_list.split('\n')))
+
+
+# The default line exclusion regexes
+DEFAULT_EXCLUDE = [
+    '(?i)# *pragma[: ]*no *cover',
+    ]
+
+# The default partial branch regexes, to be modified by the user.
+DEFAULT_PARTIAL = [
+    '(?i)# *pragma[: ]*no *branch',
+    ]
+
+# The default partial branch regexes, based on Python semantics.
+# These are any Python branching constructs that can't actually execute all
+# their branches.
+DEFAULT_PARTIAL_ALWAYS = [
+    'while (True|1|False|0):',
+    'if (True|1|False|0):',
+    ]
+
+
+class CoverageConfig(object):
+    """Coverage.py configuration.
+
+    The attributes of this class are the various settings that control the
+    operation of coverage.py.
+
+    """
+    def __init__(self):
+        """Initialize the configuration attributes to their defaults."""
+        # Metadata about the config.
+        self.attempted_config_files = []
+        self.config_files = []
+
+        # Defaults for [run]
+        self.branch = False
+        self.cover_pylib = False
+        self.data_file = ".coverage"
+        self.parallel = False
+        self.timid = False
+        self.source = None
+        self.debug = []
+
+        # Defaults for [report]
+        self.exclude_list = DEFAULT_EXCLUDE[:]
+        self.ignore_errors = False
+        self.include = None
+        self.omit = None
+        self.partial_list = DEFAULT_PARTIAL[:]
+        self.partial_always_list = DEFAULT_PARTIAL_ALWAYS[:]
+        self.precision = 0
+        self.show_missing = False
+
+        # Defaults for [html]
+        self.html_dir = "htmlcov"
+        self.extra_css = None
+        self.html_title = "Coverage report"
+
+        # Defaults for [xml]
+        self.xml_output = "coverage.xml"
+
+        # Defaults for [paths]
+        self.paths = {}
+
+    def from_environment(self, env_var):
+        """Read configuration from the `env_var` environment variable."""
+        # Timidity: for nose users, read an environment variable.  This is a
+        # cheap hack, since the rest of the command line arguments aren't
+        # recognized, but it solves some users' problems.
+        env = os.environ.get(env_var, '')
+        if env:
+            self.timid = ('--timid' in env)
+
+    MUST_BE_LIST = ["omit", "include", "debug"]
+
+    def from_args(self, **kwargs):
+        """Read config values from `kwargs`."""
+        for k, v in iitems(kwargs):
+            if v is not None:
+                if k in self.MUST_BE_LIST and isinstance(v, string_class):
+                    v = [v]
+                setattr(self, k, v)
+
+    def from_file(self, filename):
+        """Read configuration from a .rc file.
+
+        `filename` is a file name to read.
+
+        """
+        self.attempted_config_files.append(filename)
+
+        cp = HandyConfigParser()
+        files_read = cp.read(filename)
+        if files_read is not None:  # return value changed in 2.4
+            self.config_files.extend(files_read)
+
+        for option_spec in self.CONFIG_FILE_OPTIONS:
+            self.set_attr_from_config_option(cp, *option_spec)
+
+        # [paths] is special
+        if cp.has_section('paths'):
+            for option in cp.options('paths'):
+                self.paths[option] = cp.getlist('paths', option)
+
+    CONFIG_FILE_OPTIONS = [
+        # [run]
+        ('branch', 'run:branch', 'boolean'),
+        ('cover_pylib', 'run:cover_pylib', 'boolean'),
+        ('data_file', 'run:data_file'),
+        ('debug', 'run:debug', 'list'),
+        ('include', 'run:include', 'list'),
+        ('omit', 'run:omit', 'list'),
+        ('parallel', 'run:parallel', 'boolean'),
+        ('source', 'run:source', 'list'),
+        ('timid', 'run:timid', 'boolean'),
+
+        # [report]
+        ('exclude_list', 'report:exclude_lines', 'linelist'),
+        ('ignore_errors', 'report:ignore_errors', 'boolean'),
+        ('include', 'report:include', 'list'),
+        ('omit', 'report:omit', 'list'),
+        ('partial_list', 'report:partial_branches', 'linelist'),
+        ('partial_always_list', 'report:partial_branches_always', 'linelist'),
+        ('precision', 'report:precision', 'int'),
+        ('show_missing', 'report:show_missing', 'boolean'),
+
+        # [html]
+        ('html_dir', 'html:directory'),
+        ('extra_css', 'html:extra_css'),
+        ('html_title', 'html:title'),
+
+        # [xml]
+        ('xml_output', 'xml:output'),
+        ]
+
+    def set_attr_from_config_option(self, cp, attr, where, type_=''):
+        """Set an attribute on self if it exists in the ConfigParser."""
+        section, option = where.split(":")
+        if cp.has_option(section, option):
+            method = getattr(cp, 'get'+type_)
+            setattr(self, attr, method(section, option))