1 # Copyright (C) 2010 Google Inc. All rights reserved.

     2 # Copyright (C) 2010 Chris Jerdonek (chris.jerdonek@gmail.com)

     3 # Copyright (C) 2010 ProFUSION embedded systems

     4 #

     5 # Redistribution and use in source and binary forms, with or without

     6 # modification, are permitted provided that the following conditions are

     7 # met:

     8 #

     9 #     * Redistributions of source code must retain the above copyright

    10 # notice, this list of conditions and the following disclaimer.

    11 #     * Redistributions in binary form must reproduce the above

    12 # copyright notice, this list of conditions and the following disclaimer

    13 # in the documentation and/or other materials provided with the

    14 # distribution.

    15 #     * Neither the name of Google Inc. nor the names of its

    16 # contributors may be used to endorse or promote products derived from

    17 # this software without specific prior written permission.

    18 #

    19 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

    20 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

    21 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

    22 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

    23 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

    24 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

    25 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

    26 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

    27 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    28 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    29 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    30 

    31 import logging

    32 

    33 from webkitpy.common.checkout.diff_parser import DiffParser

    34 

    35 

    36 _log = logging.getLogger("webkitpy.style.patchreader")

    37 

    38 

    39 class PatchReader(object):

    40 

    41     """Supports checking style in patches."""

    42 

    43     def __init__(self, text_file_reader):

    44         """Create a PatchReader instance.

    45 

    46         Args:

    47           text_file_reader: A TextFileReader instance.

    48 

    49         """

    50         self._text_file_reader = text_file_reader

    51 

    52     def check(self, patch_string):

    53         """Check style in the given patch."""

    54         patch_files = DiffParser(patch_string.splitlines()).files

    55 

    56         # The diff variable is a DiffFile instance.

    57         for path, diff in patch_files.iteritems():

    58             line_numbers = set()

    59             for line in diff.lines:

    60                 # When deleted line is not set, it means that

    61                 # the line is newly added (or modified).

    62                 if not line[0]:

    63                     line_numbers.add(line[1])

    64 

    65             _log.debug('Found %s new or modified lines in: %s'

    66                        % (len(line_numbers), path))

    67 

    68             # If line_numbers is empty, the file has no new or

    69             # modified lines.  In this case, we don't check the file

    70             # because we'll never output errors for the file.

    71             # This optimization also prevents the program from exiting

    72             # due to a deleted file.

    73             if line_numbers:

    74                 self._text_file_reader.process_file(file_path=path,

    75                                                     line_numbers=line_numbers)