Add python coverage 3.7 to depot tools.

third_party/coverage/report.py

Index: third_party/coverage/report.py
diff --git a/third_party/coverage/report.py b/third_party/coverage/report.py
new file mode 100644
index 0000000000000000000000000000000000000000..34f44422298ec7519d221d85cb48ff8b2e52ba27
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+++ b/third_party/coverage/report.py
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+"""Reporter foundation for Coverage."""
+
+import fnmatch, os
+from coverage.codeunit import code_unit_factory
+from coverage.files import prep_patterns
+from coverage.misc import CoverageException, NoSource, NotPython
+
+class Reporter(object):
+    """A base class for all reporters."""
+
+    def __init__(self, coverage, config):
+        """Create a reporter.
+
+        `coverage` is the coverage instance. `config` is an instance  of
+        CoverageConfig, for controlling all sorts of behavior.
+
+        """
+        self.coverage = coverage
+        self.config = config
+
+        # The code units to report on.  Set by find_code_units.
+        self.code_units = []
+
+        # The directory into which to place the report, used by some derived
+        # classes.
+        self.directory = None
+
+    def find_code_units(self, morfs):
+        """Find the code units we'll report on.
+
+        `morfs` is a list of modules or filenames.
+
+        """
+        morfs = morfs or self.coverage.data.measured_files()
+        file_locator = self.coverage.file_locator
+        self.code_units = code_unit_factory(morfs, file_locator)
+
+        if self.config.include:
+            patterns = prep_patterns(self.config.include)
+            filtered = []
+            for cu in self.code_units:
+                for pattern in patterns:
+                    if fnmatch.fnmatch(cu.filename, pattern):
+                        filtered.append(cu)
+                        break
+            self.code_units = filtered
+
+        if self.config.omit:
+            patterns = prep_patterns(self.config.omit)
+            filtered = []
+            for cu in self.code_units:
+                for pattern in patterns:
+                    if fnmatch.fnmatch(cu.filename, pattern):
+                        break
+                else:
+                    filtered.append(cu)
+            self.code_units = filtered
+
+        self.code_units.sort()
+
+    def report_files(self, report_fn, morfs, directory=None):
+        """Run a reporting function on a number of morfs.
+
+        `report_fn` is called for each relative morf in `morfs`.  It is called
+        as::
+
+            report_fn(code_unit, analysis)
+
+        where `code_unit` is the `CodeUnit` for the morf, and `analysis` is
+        the `Analysis` for the morf.
+
+        """
+        self.find_code_units(morfs)
+
+        if not self.code_units:
+            raise CoverageException("No data to report.")
+
+        self.directory = directory
+        if self.directory and not os.path.exists(self.directory):
+            os.makedirs(self.directory)
+
+        for cu in self.code_units:
+            try:
+                report_fn(cu, self.coverage._analyze(cu))
+            except NoSource:
+                if not self.config.ignore_errors:
+                    raise
+            except NotPython:
+                # Only report errors for .py files, and only if we didn't
+                # explicitly suppress those errors.
+                if cu.should_be_python() and not self.config.ignore_errors:
+                    raise