[Predator] Add ``Project`` class and ``ClassifySuspect`` method to project and component classifier

appengine/findit/crash/component.py

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from collections import namedtuple
+import os
 import re
 
+from libs.gitiles.diff import ChangeType
+
 
 # TODO(http://crbug.com/659346): write the coverage tests.
 class Component(namedtuple('Component',
     ['component_name', 'path_regex', 'function_regex'])): # pragma: no cover
   """A representation of a "component" in Chromium.
 
   For example: 'Blink>DOM' or 'Blink>HTML'. Notably, a component knows
   how to identify itself. Hence, given a stack frame or change list
   or whatever, we ask the Component whether it matches that frame,
   CL, etc."""
   __slots__ = ()
 
   def __new__(cls, component_name, path_regex, function_regex=None):
     return super(cls, Component).__new__(cls,
       component_name,
       re.compile(path_regex),
       re.compile(function_regex) if function_regex else None)
 
-
   def MatchesStackFrame(self, frame):
     """Returns true if this component matches the frame."""
-    if not self.path_regex.match(frame.dep_path + frame.file_path):
+    if not self.path_regex.match(os.path.join(frame.dep_path, frame.file_path)):
       return False
 
     # We interpret function_regex=None to mean the regex that matches
     # everything.
     if not self.function_regex:
       return True
     return self.function_regex.match(frame.function)
 
-  def MatchesFile(self, file_path):
-    """Returns true if this component matches file path."""
-    return self.path_regex.match(file_path)
+  def MatchesTouchedFile(self, dep_path, file_path):
+    """Returns true if the touched file belongs to this component."""
+    return self.path_regex.match(os.path.join(dep_path, file_path))