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#!/usr/bin/env python
#
# Copyright 2008 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Generate a Google Mock class from a production class.
This program will read in a C++ source file and output the Google Mock class
for the specified class.
Usage:
gmock_class.py header-file.h ClassName
Output is sent to stdout.
"""
__author__ = 'nnorwitz@google.com (Neal Norwitz)'
import os
import re
import sys
from cpp import ast
from cpp import utils
# How many spaces to indent. Can me set with INDENT environment variable.
_INDENT = 2
def _GenerateMethods(output_lines, source, class_node):
function_type = ast.FUNCTION_VIRTUAL | ast.FUNCTION_PURE_VIRTUAL
ctor_or_dtor = ast.FUNCTION_CTOR | ast.FUNCTION_DTOR
for node in class_node.body:
# We only care about virtual functions.
if (isinstance(node, ast.Function) and
node.modifiers & function_type and
not node.modifiers & ctor_or_dtor):
# Pick out all the elements we need from the original function.
const = ''
if node.modifiers & ast.FUNCTION_CONST:
const = 'CONST_'
return_type = 'void'
if node.return_type:
# Add modifier bits like const.
modifiers = ''
if node.return_type.modifiers:
modifiers = ' '.join(node.return_type.modifiers) + ' '
return_type = modifiers + node.return_type.name
if node.return_type.pointer:
return_type += '*'
if node.return_type.reference:
return_type += '&'
prefix = 'MOCK_%sMETHOD%d' % (const, len(node.parameters))
args = ''
if node.parameters:
# Get the full text of the parameters from the start
# of the first parameter to the end of the last parameter.
start = node.parameters[0].start
end = node.parameters[-1].end
args = re.sub(' +', ' ', source[start:end].replace('\n', ''))
# Create the prototype.
indent = ' ' * _INDENT
line = ('%s%s(%s,\n%s%s(%s));' %
(indent, prefix, node.name, indent*3, return_type, args))
output_lines.append(line)
def _GenerateMock(filename, source, ast_list, class_name):
lines = []
for node in ast_list:
if isinstance(node, ast.Class) and node.body and node.name == class_name:
class_node = node
# Add namespace before the class.
if class_node.namespace:
lines.extend(['namespace %s {' % n for n in class_node.namespace]) # }
lines.append('')
# Add the class prolog.
lines.append('class Mock%s : public %s {' % (class_name, class_name)) # }
lines.append('%spublic:' % (' ' * (_INDENT // 2)))
# Add all the methods.
_GenerateMethods(lines, source, class_node)
# Close the class.
if lines:
# If there are no virtual methods, no need for a public label.
if len(lines) == 2:
del lines[-1]
# Only close the class if there really is a class.
lines.append('};')
lines.append('') # Add an extra newline.
# Close the namespace.
if class_node.namespace:
for i in range(len(class_node.namespace)-1, -1, -1):
lines.append('} // namespace %s' % class_node.namespace[i])
lines.append('') # Add an extra newline.
if lines:
sys.stdout.write('\n'.join(lines))
else:
sys.stderr.write('Class %s not found\n' % class_name)
def main(argv=sys.argv):
if len(argv) != 3:
sys.stdout.write(__doc__)
return 1
global _INDENT
try:
_INDENT = int(os.environ['INDENT'])
except KeyError:
pass
except:
sys.stderr.write('Unable to use indent of %s\n' % os.environ.get('INDENT'))
filename, class_name = argv[1:]
source = utils.ReadFile(filename)
if source is None:
return 1
builder = ast.BuilderFromSource(source, filename)
try:
entire_ast = filter(None, builder.Generate())
except KeyboardInterrupt:
return
except:
# An error message was already printed since we couldn't parse.
pass
else:
_GenerateMock(filename, source, entire_ast, class_name)
if __name__ == '__main__':
main(sys.argv)
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