Telemetry: add a page filter for excluding pages.

tools/telemetry/telemetry/page_filter.py

Index: tools/telemetry/telemetry/page_filter.py
diff --git a/tools/telemetry/telemetry/page_filter.py b/tools/telemetry/telemetry/page_filter.py
new file mode 100644
index 0000000000000000000000000000000000000000..0aaa68e522c657900ea38407dcf37294c90fd554
--- /dev/null
+++ b/tools/telemetry/telemetry/page_filter.py
@@ -0,0 +1,40 @@
+# Copyright (c) 2013 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.
+import optparse
+import re
+
+class PageFilter(object):
+  """Filters pages in the page set based on command line flags."""
+
+  def __init__(self, options):
+    if options.page_filter:
+      try:
+        self._page_regex = re.compile(options.page_filter)
+      except re.error:
+        raise Exception('--page-filter: invalid regex')
+    else:
+      self._page_regex = None
+
+    if options.page_filter_exclude:
+      try:
+        self._page_exclude_regex = re.compile(options.page_filter_exclude)
+      except re.error:
+        raise Exception('--page-filter-exclude: invalid regex')
+    else:
+      self._page_exclude_regex = None
+
+  def IsSelected(self, page):
+    if self._page_exclude_regex and self._page_exclude_regex.search(page.url):
+      return False
+    if self._page_regex:
+      return self._page_regex.search(page.url)
+
+  @staticmethod
+  def AddCommandLineOptions(parser):
+    group = optparse.OptionGroup(parser, 'Page filtering options')
+    group.add_option('--page-filter', dest='page_filter',
+        help='Use only pages whose URLs match the given filter regexp.')
+    group.add_option('--page-filter-exclude', dest='page_filter_exclude',
+        help='Exclude pages whose URLs match the given filter regexp.')
+    parser.add_option_group(group)