features_h_generator.py revision f2477e01787aa58f445919b809d89e252beef54f 
1# Copyright 2013 The Chromium Authors. All rights reserved.
2# Use of this source code is governed by a BSD-style license that can be
3# found in the LICENSE file.
4
5import os.path
6
7from code import Code
8import cpp_util
9
10
11class HGenerator(object):
12  def Generate(self, features, source_file, namespace):
13    return _Generator(features, source_file, namespace).Generate()
14
15
16class _Generator(object):
17  """A .cc generator for features.
18  """
19  def __init__(self, features, source_file, namespace):
20    self._feature_defs = features
21    self._source_file = source_file
22    self._source_file_filename, _ = os.path.splitext(source_file)
23    self._class_name = cpp_util.ClassName(self._source_file_filename)
24    self._namespace = namespace
25
26  def Generate(self):
27    """Generates a Code object for features.
28    """
29    c = Code()
30    (c.Append(cpp_util.CHROMIUM_LICENSE)
31      .Append()
32      .Append(cpp_util.GENERATED_FEATURE_MESSAGE % self._source_file)
33      .Append()
34    )
35    ifndef_name = cpp_util.GenerateIfndefName(self._source_file_filename,
36                                              self._class_name)
37    (c.Append('#ifndef %s' % ifndef_name)
38      .Append('#define %s' % ifndef_name)
39      .Append()
40    )
41
42    (c.Append('#include <map>')
43      .Append('#include <string>')
44      .Append()
45      .Concat(cpp_util.OpenNamespace(self._namespace))
46      .Append()
47    )
48
49    (c.Append('class %s {' % self._class_name)
50      .Append(' public:')
51      .Sblock()
52      .Concat(self._GeneratePublicBody())
53      .Eblock()
54      .Append(' private:')
55      .Sblock()
56      .Concat(self._GeneratePrivateBody())
57      .Eblock('};')
58      .Append()
59      .Cblock(cpp_util.CloseNamespace(self._namespace))
60    )
61    (c.Append('#endif  // %s' % ifndef_name)
62      .Append()
63    )
64    return c
65
66  def _GeneratePublicBody(self):
67    c = Code()
68
69    (c.Append('%s();' % self._class_name)
70      .Append()
71      .Append('enum ID {')
72      .Concat(self._GenerateEnumConstants())
73      .Eblock('};')
74      .Append()
75      .Append('const char* ToString(ID id) const;')
76      .Append('ID FromString(const std::string& id) const;')
77      .Append()
78    )
79    return c
80
81  def _GeneratePrivateBody(self):
82    return Code().Append('std::map<std::string, '
83                         '%s::ID> features_;' % self._class_name)
84
85  def _GenerateEnumConstants(self):
86    c = Code()
87
88    (c.Sblock()
89      .Append('kUnknown,')
90    )
91    for feature in self._feature_defs:
92      c.Append('%s,' % cpp_util.ConstantName(feature.name))
93    c.Append('kEnumBoundary')
94
95    return c
96