tools/json_schema_compiler/features_cc_generator.py

   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
   5 import os.path
   6
   7 from code import Code
   8 import cpp_util
   9
  10
  11 class CCGenerator(object):
  12   def Generate(self, feature_defs, source_file, namespace):
  13     return _Generator(feature_defs, source_file, namespace).Generate()
  14
  15
  16 class _Generator(object):
  17   """A .cc generator for features.
  18   """
  19   def __init__(self, feature_defs, source_file, namespace):
  20     self._feature_defs = feature_defs
  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       .Append('#include <string>')
  35       .Append()
  36       .Append('#include "%s.h"' % self._source_file_filename)
  37       .Append()
  38       .Append('#include "base/logging.h"')
  39       .Append()
  40       .Concat(cpp_util.OpenNamespace(self._namespace))
  41       .Append()
  42     )
  43
  44     # Generate the constructor.
  45     (c.Append('%s::%s() {' % (self._class_name, self._class_name))
  46       .Sblock()
  47     )
  48     for feature in self._feature_defs:
  49       c.Append('features_["%s"] = %s;'
  50                        % (feature.name, cpp_util.ConstantName(feature.name)))
  51     (c.Eblock()
  52       .Append('}')
  53       .Append()
  54     )
  55
  56     # Generate the ToString function.
  57     (c.Append('const char* %s::ToString('
  58                   '%s::ID id) const {' % (self._class_name, self._class_name))
  59       .Sblock()
  60       .Append('switch (id) {')
  61       .Sblock()
  62     )
  63     for feature in self._feature_defs:
  64       c.Append('case %s: return "%s";' %
  65           (cpp_util.ConstantName(feature.name), feature.name))
  66     (c.Append('case kUnknown: break;')
  67       .Append('case kEnumBoundary: break;')
  68       .Eblock()
  69       .Append('}')
  70       .Append('NOTREACHED();')
  71       .Append('return "";')
  72     )
  73     (c.Eblock()
  74       .Append('}')
  75       .Append()
  76     )
  77
  78     # Generate the FromString function.
  79
  80     (c.Append('%s::ID %s::FromString('
  81                   'const std::string& id) const {'
  82                   % (self._class_name, self._class_name))
  83       .Sblock()
  84       .Append('std::map<std::string, %s::ID>::const_iterator it'
  85                   ' = features_.find(id);' % self._class_name)
  86       .Append('if (it == features_.end())')
  87       .Append('  return kUnknown;')
  88       .Append('return it->second;')
  89       .Eblock()
  90       .Append('}')
  91       .Append()
  92       .Cblock(cpp_util.CloseNamespace(self._namespace))
  93     )
  94
  95     return c