--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKitTools/Scripts/webkitpy/style/patchreader.py	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,75 @@
+# Copyright (C) 2010 Google Inc. All rights reserved.
+# Copyright (C) 2010 Chris Jerdonek (chris.jerdonek@gmail.com)
+# Copyright (C) 2010 ProFUSION embedded systems
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+import logging
+
+from webkitpy.common.checkout.diff_parser import DiffParser
+
+
+_log = logging.getLogger("webkitpy.style.patchreader")
+
+
+class PatchReader(object):
+
+    """Supports checking style in patches."""
+
+    def __init__(self, text_file_reader):
+        """Create a PatchReader instance.
+
+        Args:
+          text_file_reader: A TextFileReader instance.
+
+        """
+        self._text_file_reader = text_file_reader
+
+    def check(self, patch_string):
+        """Check style in the given patch."""
+        patch_files = DiffParser(patch_string.splitlines()).files
+
+        # The diff variable is a DiffFile instance.
+        for path, diff in patch_files.iteritems():
+            line_numbers = set()
+            for line in diff.lines:
+                # When deleted line is not set, it means that
+                # the line is newly added (or modified).
+                if not line[0]:
+                    line_numbers.add(line[1])
+
+            _log.debug('Found %s new or modified lines in: %s'
+                       % (len(line_numbers), path))
+
+            # If line_numbers is empty, the file has no new or
+            # modified lines.  In this case, we don't check the file
+            # because we'll never output errors for the file.
+            # This optimization also prevents the program from exiting
+            # due to a deleted file.
+            if line_numbers:
+                self._text_file_reader.process_file(file_path=path,
+                                                    line_numbers=line_numbers)