ceph/src/googletest/googlemock/scripts/generator/cpp/gmock_class.py

   1 #!/usr/bin/env python
   2 #
   3 # Copyright 2008 Google Inc.  All Rights Reserved.
   4 #
   5 # Licensed under the Apache License, Version 2.0 (the "License");
   6 # you may not use this file except in compliance with the License.
   7 # You may obtain a copy of the License at
   8 #
   9 #      http://www.apache.org/licenses/LICENSE-2.0
  10 #
  11 # Unless required by applicable law or agreed to in writing, software
  12 # distributed under the License is distributed on an "AS IS" BASIS,
  13 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  14 # See the License for the specific language governing permissions and
  15 # limitations under the License.
  16
  17 """Generate Google Mock classes from base classes.
  18
  19 This program will read in a C++ source file and output the Google Mock
  20 classes for the specified classes.  If no class is specified, all
  21 classes in the source file are emitted.
  22
  23 Usage:
  24   gmock_class.py header-file.h [ClassName]...
  25
  26 Output is sent to stdout.
  27 """
  28
  29 __author__ = 'nnorwitz@google.com (Neal Norwitz)'
  30
  31
  32 import os
  33 import re
  34 import sys
  35
  36 from cpp import ast
  37 from cpp import utils
  38
  39 # Preserve compatibility with Python 2.3.
  40 try:
  41   _dummy = set
  42 except NameError:
  43   import sets
  44   set = sets.Set
  45
  46 _VERSION = (1, 0, 1)  # The version of this script.
  47 # How many spaces to indent.  Can set me with the INDENT environment variable.
  48 _INDENT = 2
  49
  50
  51 def _GenerateMethods(output_lines, source, class_node):
  52   function_type = (ast.FUNCTION_VIRTUAL | ast.FUNCTION_PURE_VIRTUAL |
  53                    ast.FUNCTION_OVERRIDE)
  54   ctor_or_dtor = ast.FUNCTION_CTOR | ast.FUNCTION_DTOR
  55   indent = ' ' * _INDENT
  56
  57   for node in class_node.body:
  58     # We only care about virtual functions.
  59     if (isinstance(node, ast.Function) and
  60         node.modifiers & function_type and
  61         not node.modifiers & ctor_or_dtor):
  62       # Pick out all the elements we need from the original function.
  63       const = ''
  64       if node.modifiers & ast.FUNCTION_CONST:
  65         const = 'CONST_'
  66       return_type = 'void'
  67       if node.return_type:
  68         # Add modifiers like 'const'.
  69         modifiers = ''
  70         if node.return_type.modifiers:
  71           modifiers = ' '.join(node.return_type.modifiers) + ' '
  72         return_type = modifiers + node.return_type.name
  73         template_args = [arg.name for arg in node.return_type.templated_types]
  74         if template_args:
  75           return_type += '<' + ', '.join(template_args) + '>'
  76           if len(template_args) > 1:
  77             for line in [
  78                 '// The following line won\'t really compile, as the return',
  79                 '// type has multiple template arguments.  To fix it, use a',
  80                 '// typedef for the return type.']:
  81               output_lines.append(indent + line)
  82         if node.return_type.pointer:
  83           return_type += '*'
  84         if node.return_type.reference:
  85           return_type += '&'
  86         num_parameters = len(node.parameters)
  87         if len(node.parameters) == 1:
  88           first_param = node.parameters[0]
  89           if source[first_param.start:first_param.end].strip() == 'void':
  90             # We must treat T(void) as a function with no parameters.
  91             num_parameters = 0
  92       tmpl = ''
  93       if class_node.templated_types:
  94         tmpl = '_T'
  95       mock_method_macro = 'MOCK_%sMETHOD%d%s' % (const, num_parameters, tmpl)
  96
  97       args = ''
  98       if node.parameters:
  99         # Due to the parser limitations, it is impossible to keep comments
 100         # while stripping the default parameters.  When defaults are
 101         # present, we choose to strip them and comments (and produce
 102         # compilable code).
 103         # TODO(nnorwitz@google.com): Investigate whether it is possible to
 104         # preserve parameter name when reconstructing parameter text from
 105         # the AST.
 106         if len([param for param in node.parameters if param.default]) > 0:
 107           args = ', '.join(param.type.name for param in node.parameters)
 108         else:
 109           # Get the full text of the parameters from the start
 110           # of the first parameter to the end of the last parameter.
 111           start = node.parameters[0].start
 112           end = node.parameters[-1].end
 113           # Remove // comments.
 114           args_strings = re.sub(r'//.*', '', source[start:end])
 115           # Condense multiple spaces and eliminate newlines putting the
 116           # parameters together on a single line.  Ensure there is a
 117           # space in an argument which is split by a newline without
 118           # intervening whitespace, e.g.: int\nBar
 119           args = re.sub('  +', ' ', args_strings.replace('\n', ' '))
 120
 121       # Create the mock method definition.
 122       output_lines.extend(['%s%s(%s,' % (indent, mock_method_macro, node.name),
 123                            '%s%s(%s));' % (indent*3, return_type, args)])
 124
 125
 126 def _GenerateMocks(filename, source, ast_list, desired_class_names):
 127   processed_class_names = set()
 128   lines = []
 129   for node in ast_list:
 130     if (isinstance(node, ast.Class) and node.body and
 131         # desired_class_names being None means that all classes are selected.
 132         (not desired_class_names or node.name in desired_class_names)):
 133       class_name = node.name
 134       parent_name = class_name
 135       processed_class_names.add(class_name)
 136       class_node = node
 137       # Add namespace before the class.
 138       if class_node.namespace:
 139         lines.extend(['namespace %s {' % n for n in class_node.namespace])  # }
 140         lines.append('')
 141
 142       # Add template args for templated classes.
 143       if class_node.templated_types:
 144         # TODO(paulchang): The AST doesn't preserve template argument order,
 145         # so we have to make up names here.
 146         # TODO(paulchang): Handle non-type template arguments (e.g.
 147         # template<typename T, int N>).
 148         template_arg_count = len(class_node.templated_types.keys())
 149         template_args = ['T%d' % n for n in range(template_arg_count)]
 150         template_decls = ['typename ' + arg for arg in template_args]
 151         lines.append('template <' + ', '.join(template_decls) + '>')
 152         parent_name += '<' + ', '.join(template_args) + '>'
 153
 154       # Add the class prolog.
 155       lines.append('class Mock%s : public %s {'  # }
 156                    % (class_name, parent_name))
 157       lines.append('%spublic:' % (' ' * (_INDENT // 2)))
 158
 159       # Add all the methods.
 160       _GenerateMethods(lines, source, class_node)
 161
 162       # Close the class.
 163       if lines:
 164         # If there are no virtual methods, no need for a public label.
 165         if len(lines) == 2:
 166           del lines[-1]
 167
 168         # Only close the class if there really is a class.
 169         lines.append('};')
 170         lines.append('')  # Add an extra newline.
 171
 172       # Close the namespace.
 173       if class_node.namespace:
 174         for i in range(len(class_node.namespace)-1, -1, -1):
 175           lines.append('}  // namespace %s' % class_node.namespace[i])
 176         lines.append('')  # Add an extra newline.
 177
 178   if desired_class_names:
 179     missing_class_name_list = list(desired_class_names - processed_class_names)
 180     if missing_class_name_list:
 181       missing_class_name_list.sort()
 182       sys.stderr.write('Class(es) not found in %s: %s\n' %
 183                        (filename, ', '.join(missing_class_name_list)))
 184   elif not processed_class_names:
 185     sys.stderr.write('No class found in %s\n' % filename)
 186
 187   return lines
 188
 189
 190 def main(argv=sys.argv):
 191   if len(argv) < 2:
 192     sys.stderr.write('Google Mock Class Generator v%s\n\n' %
 193                      '.'.join(map(str, _VERSION)))
 194     sys.stderr.write(__doc__)
 195     return 1
 196
 197   global _INDENT
 198   try:
 199     _INDENT = int(os.environ['INDENT'])
 200   except KeyError:
 201     pass
 202   except:
 203     sys.stderr.write('Unable to use indent of %s\n' % os.environ.get('INDENT'))
 204
 205   filename = argv[1]
 206   desired_class_names = None  # None means all classes in the source file.
 207   if len(argv) >= 3:
 208     desired_class_names = set(argv[2:])
 209   source = utils.ReadFile(filename)
 210   if source is None:
 211     return 1
 212
 213   builder = ast.BuilderFromSource(source, filename)
 214   try:
 215     entire_ast = filter(None, builder.Generate())
 216   except KeyboardInterrupt:
 217     return
 218   except:
 219     # An error message was already printed since we couldn't parse.
 220     sys.exit(1)
 221   else:
 222     lines = _GenerateMocks(filename, source, entire_ast, desired_class_names)
 223     sys.stdout.write('\n'.join(lines))
 224
 225
 226 if __name__ == '__main__':
 227   main(sys.argv)