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      1 #!/usr/bin/env python
      2 # Copyright (C) 2013 Google Inc. All rights reserved.
      3 #
      4 # Redistribution and use in source and binary forms, with or without
      5 # modification, are permitted provided that the following conditions are
      6 # met:
      7 #
      8 #     * Redistributions of source code must retain the above copyright
      9 # notice, this list of conditions and the following disclaimer.
     10 #     * Redistributions in binary form must reproduce the above
     11 # copyright notice, this list of conditions and the following disclaimer
     12 # in the documentation and/or other materials provided with the
     13 # distribution.
     14 #     * Neither the name of Google Inc. nor the names of its
     15 # contributors may be used to endorse or promote products derived from
     16 # this software without specific prior written permission.
     17 #
     18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29 
     30 import os.path
     31 import sys
     32 
     33 from in_file import InFile
     34 import in_generator
     35 import template_expander
     36 
     37 
     38 class RuntimeFeatureWriter(in_generator.Writer):
     39     class_name = 'RuntimeEnabledFeatures'
     40 
     41     # FIXME: valid_values and defaults should probably roll into one object.
     42     valid_values = {
     43         'status': ['stable', 'experimental', 'test'],
     44     }
     45     defaults = {
     46         'condition' : None,
     47         'depends_on' : [],
     48         'custom': False,
     49         'status': None,
     50     }
     51 
     52     def __init__(self, in_file_path, enabled_conditions):
     53         super(RuntimeFeatureWriter, self).__init__(in_file_path, enabled_conditions)
     54         self._outputs = {(self.class_name + ".h"): self.generate_header,
     55                          (self.class_name + ".cpp"): self.generate_implementation,
     56                         }
     57 
     58         self._features = self.in_file.name_dictionaries
     59         # Make sure the resulting dictionaries have all the keys we expect.
     60         for feature in self._features:
     61             feature['first_lowered_name'] = self._lower_first(feature['name'])
     62             # Most features just check their isFooEnabled bool
     63             # but some depend on more than one bool.
     64             enabled_condition = "is%sEnabled" % feature['name']
     65             for dependant_name in feature['depends_on']:
     66                 enabled_condition += " && is%sEnabled" % dependant_name
     67             feature['enabled_condition'] = enabled_condition
     68         self._non_custom_features = filter(lambda feature: not feature['custom'], self._features)
     69 
     70     def _lower_first(self, string):
     71         lowered = string[0].lower() + string[1:]
     72         lowered = lowered.replace("cSS", "css")
     73         lowered = lowered.replace("iME", "ime")
     74         lowered = lowered.replace("hTML", "html")
     75         lowered = lowered.replace("wOFF", "woff")
     76         return lowered
     77 
     78     def _feature_sets(self):
     79         # Another way to think of the status levels is as "sets of features"
     80         # which is how we're referring to them in this generator.
     81         return self.valid_values['status']
     82 
     83     @template_expander.use_jinja(class_name + ".h.tmpl")
     84     def generate_header(self):
     85         return {
     86             'features': self._features,
     87             'feature_sets': self._feature_sets(),
     88         }
     89 
     90     @template_expander.use_jinja(class_name + ".cpp.tmpl")
     91     def generate_implementation(self):
     92         return {
     93             'features': self._features,
     94             'feature_sets': self._feature_sets(),
     95         }
     96 
     97 
     98 if __name__ == "__main__":
     99     in_generator.Maker(RuntimeFeatureWriter).main(sys.argv)
    100