[Predator] Generate all changelogs in regression ranges instead of only matched changelogs

appengine/findit/crash/scorers/min_distance.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.
-
-"""MinDistance scorer applies to Suspect objects.
-
-It represents a heuristic rule:
-  1. Highest score if the suspect changed the crashed lines.
-  2. 0 score if changed lines are too far away from crashed lines.
-"""
-
-import logging
-
-from crash.scorers.scorer import Scorer
-
-_MAX_DISTANCE = 50
-
-
-class MinDistance(Scorer):
-
-  def __init__(self, max_distance=_MAX_DISTANCE):
-    self.max_distance = max_distance
-
-  def GetMetric(self, suspect):
-    min_distance = float('inf')
-    for analysis_info in suspect.file_to_analysis_info.itervalues():
-      min_distance = min(min_distance, analysis_info.min_distance)
-
-    return min_distance
-
-  def Score(self, min_distance):
-    if min_distance > self.max_distance:
-      return 0
-
-    if min_distance == 0:
-      return 1
-
-    # TODO(katesonia): This number is randomly picked from a reasonable range,
-    # best value to use still needs be experimented out.
-    return 0.8
-
-  def Reason(self, min_distance, score):
-    if score == 0:
-      return None
-
-    return self.name, score, 'Minimum distance is %d' % min_distance
-
-  def ChangedFiles(self, suspect, score):
-    """Returns a list of changed file infos related to this scorer.
-
-    For example:
-    [
-      {
-        "blame_url": "https://chr.com/../render_frame_impl.cc#1586",
-        "file": "render_frame_impl.cc",
-        "info": "Minimum distance (LOC) 1, frame #5"
-      }
-    ]
-    """
-    if score == 0:
-      return None
-
-    index_to_changed_files = {}
-
-    for file_path, analysis_info in suspect.file_to_analysis_info.iteritems():
-      file_name = file_path.split('/')[-1]
-      frame = analysis_info.min_distance_frame
-
-      # It is possible that a changelog doesn't show in the blame of a file,
-      # in this case, treat the changelog as if it didn't change the file.
-      if analysis_info.min_distance == float('inf'):
-        continue
-
-      index_to_changed_files[frame.index] = {
-          'file': file_name,
-          'blame_url': frame.BlameUrl(suspect.changelog.revision),
-          'info': 'Minimum distance (LOC) %d, frame #%d' % (
-              analysis_info.min_distance, frame.index)
-      }
-
-    # Sort changed file by frame index.
-    _, changed_files = zip(*sorted(index_to_changed_files.items(),
-                                   key=lambda x: x[0]))
-
-    return list(changed_files)