third_party/WebKit/Source/build/scripts/in_generator.py

   1 # Copyright (C) 2013 Google Inc. All rights reserved.
   2 #
   3 # Redistribution and use in source and binary forms, with or without
   4 # modification, are permitted provided that the following conditions are
   5 # met:
   6 #
   7 #     * Redistributions of source code must retain the above copyright
   8 # notice, this list of conditions and the following disclaimer.
   9 #     * Redistributions in binary form must reproduce the above
  10 # copyright notice, this list of conditions and the following disclaimer
  11 # in the documentation and/or other materials provided with the
  12 # distribution.
  13 #     * Neither the name of Google Inc. nor the names of its
  14 # contributors may be used to endorse or promote products derived from
  15 # this software without specific prior written permission.
  16 #
  17 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  18 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  19 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  20 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  21 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  27 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28
  29 import os.path
  30 import shlex
  31 import shutil
  32 import optparse
  33
  34 from in_file import InFile
  35
  36
  37 class Writer(object):
  38     # Subclasses should override.
  39     class_name = None
  40     defaults = None
  41     valid_values = None
  42     default_parameters = None
  43
  44     def __init__(self, in_files):
  45         if isinstance(in_files, basestring):
  46             in_files = [in_files]
  47         if in_files:
  48             self.in_file = InFile.load_from_files(in_files, self.defaults, self.valid_values, self.default_parameters)
  49         else:
  50             self.in_file = None
  51         self._outputs = {}  # file_name -> generator
  52
  53     def wrap_with_condition(self, string, condition):
  54         if not condition:
  55             return string
  56         return "#if ENABLE(%(condition)s)\n%(string)s\n#endif" % { 'condition' : condition, 'string' : string }
  57
  58     def _write_file_if_changed(self, output_dir, contents, file_name):
  59         path = os.path.join(output_dir, file_name)
  60
  61         # The build system should ensure our output directory exists, but just in case.
  62         directory = os.path.dirname(path)
  63         if not os.path.exists(directory):
  64             os.makedirs(directory)
  65
  66         # Only write the file if the contents have changed. This allows ninja to
  67         # skip rebuilding targets which depend on the output.
  68         with open(path, "a+") as output_file:
  69             output_file.seek(0)
  70             if output_file.read() != contents:
  71                 output_file.truncate(0)
  72                 output_file.write(contents)
  73
  74     def write_files(self, output_dir):
  75         for file_name, generator in self._outputs.items():
  76             self._write_file_if_changed(output_dir, generator(), file_name)
  77
  78     def set_gperf_path(self, gperf_path):
  79         self.gperf_path = gperf_path
  80
  81
  82 class Maker(object):
  83     def __init__(self, writer_class):
  84         self._writer_class = writer_class
  85
  86     def main(self, argv):
  87         script_name = os.path.basename(argv[0])
  88         args = argv[1:]
  89         if len(args) < 1:
  90             print "USAGE: %s INPUT_FILES" % script_name
  91             exit(1)
  92
  93         parser = optparse.OptionParser()
  94         parser.add_option("--gperf", default="gperf")
  95         parser.add_option("--output_dir", default=os.getcwd())
  96         options, args = parser.parse_args()
  97
  98         writer = self._writer_class(args)
  99         writer.set_gperf_path(options.gperf)
 100         writer.write_files(options.output_dir)