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#!/usr/bin/env python
#
# Copyright 2009, Google Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""fuse_gmock_files.py v0.1.0
Fuses Google Mock and Google Test source code into two .h files and a .cc file.

SYNOPSIS
       fuse_gmock_files.py [GMOCK_ROOT_DIR] OUTPUT_DIR

Scans GMOCK_ROOT_DIR for Google Mock and Google Test source
       code, assuming Google Test is in the GMOCK_ROOT_DIR/../googletest
       directory, and generates three files:
       OUTPUT_DIR/gtest/gtest.h, OUTPUT_DIR/gmock/gmock.h, and
       OUTPUT_DIR/gmock-gtest-all.cc.  Then you can build your tests
       by adding OUTPUT_DIR to the include search path and linking
       with OUTPUT_DIR/gmock-gtest-all.cc.  These three files contain
       everything you need to use Google Mock.  Hence you can
       "install" Google Mock by copying them to wherever you want.

GMOCK_ROOT_DIR can be omitted and defaults to the parent
       directory of the directory holding this script.

EXAMPLES
       ./fuse_gmock_files.py fused_gmock
       ./fuse_gmock_files.py path/to/unpacked/gmock fused_gmock

This tool is experimental.  In particular, it assumes that there is no
conditional inclusion of Google Mock or Google Test headers.  Please
report any problems to googlemock@googlegroups.com.  You can read
https://github.com/google/googletest/blob/master/googlemock/docs/CookBook.md for more
information.
"""

__author__ = 'wan@google.com (Zhanyong Wan)'

import os
import re
import sets
import sys

# We assume that this file is in the scripts/ directory in the Google
# Mock root directory.
DEFAULT_GMOCK_ROOT_DIR = os.path.join(os.path.dirname(__file__), '..')

# We need to call into googletest/scripts/fuse_gtest_files.py.
sys.path.append(os.path.join(DEFAULT_GMOCK_ROOT_DIR, '../googletest/scripts'))
import fuse_gtest_files
gtest = fuse_gtest_files

# Regex for matching '#include "gmock/..."'.
INCLUDE_GMOCK_FILE_REGEX = re.compile(r'^\s*#\s*include\s*"(gmock/.+)"')

# Where to find the source seed files.
GMOCK_H_SEED = 'include/gmock/gmock.h'
GMOCK_ALL_CC_SEED = 'src/gmock-all.cc'

# Where to put the generated files.
GTEST_H_OUTPUT = 'gtest/gtest.h'
GMOCK_H_OUTPUT = 'gmock/gmock.h'
GMOCK_GTEST_ALL_CC_OUTPUT = 'gmock-gtest-all.cc'

def GetGTestRootDir(gmock_root):
  """Returns the root directory of Google Test."""

return os.path.join(gmock_root, '../googletest')

def ValidateGMockRootDir(gmock_root):
  """Makes sure gmock_root points to a valid gmock root directory.

The function aborts the program on failure.
  """

gtest.ValidateGTestRootDir(GetGTestRootDir(gmock_root))
  gtest.VerifyFileExists(gmock_root, GMOCK_H_SEED)
  gtest.VerifyFileExists(gmock_root, GMOCK_ALL_CC_SEED)

def ValidateOutputDir(output_dir):
  """Makes sure output_dir points to a valid output directory.

The function aborts the program on failure.
  """

gtest.VerifyOutputFile(output_dir, gtest.GTEST_H_OUTPUT)
  gtest.VerifyOutputFile(output_dir, GMOCK_H_OUTPUT)
  gtest.VerifyOutputFile(output_dir, GMOCK_GTEST_ALL_CC_OUTPUT)

def FuseGMockH(gmock_root, output_dir):
  """Scans folder gmock_root to generate gmock/gmock.h in output_dir."""

output_file = file(os.path.join(output_dir, GMOCK_H_OUTPUT), 'w')
  processed_files = sets.Set()  # Holds all gmock headers we've processed.

def ProcessFile(gmock_header_path):
    """Processes the given gmock header file."""

# We don't process the same header twice.
    if gmock_header_path in processed_files:
      return

processed_files.add(gmock_header_path)

# Reads each line in the given gmock header.
    for line in file(os.path.join(gmock_root, gmock_header_path), 'r'):
      m = INCLUDE_GMOCK_FILE_REGEX.match(line)
      if m:
        # It's '#include "gmock/..."' - let's process it recursively.
        ProcessFile('include/' + m.group(1))
      else:
        m = gtest.INCLUDE_GTEST_FILE_REGEX.match(line)
        if m:
          # It's '#include "gtest/foo.h"'.  We translate it to
          # "gtest/gtest.h", regardless of what foo is, since all
          # gtest headers are fused into gtest/gtest.h.

# There is no need to #include gtest.h twice.
          if not gtest.GTEST_H_SEED in processed_files:
            processed_files.add(gtest.GTEST_H_SEED)
            output_file.write('#include "%s"\n' % (gtest.GTEST_H_OUTPUT,))
        else:
          # Otherwise we copy the line unchanged to the output file.
          output_file.write(line)

ProcessFile(GMOCK_H_SEED)
  output_file.close()

def FuseGMockAllCcToFile(gmock_root, output_file):
  """Scans folder gmock_root to fuse gmock-all.cc into output_file."""

processed_files = sets.Set()

def ProcessFile(gmock_source_file):
    """Processes the given gmock source file."""

# We don't process the same #included file twice.
    if gmock_source_file in processed_files:
      return

processed_files.add(gmock_source_file)

# Reads each line in the given gmock source file.
    for line in file(os.path.join(gmock_root, gmock_source_file), 'r'):
      m = INCLUDE_GMOCK_FILE_REGEX.match(line)
      if m:
        # It's '#include "gmock/foo.h"'.  We treat it as '#include
        # "gmock/gmock.h"', as all other gmock headers are being fused
        # into gmock.h and cannot be #included directly.

# There is no need to #include "gmock/gmock.h" more than once.
        if not GMOCK_H_SEED in processed_files:
          processed_files.add(GMOCK_H_SEED)
          output_file.write('#include "%s"\n' % (GMOCK_H_OUTPUT,))
      else:
        m = gtest.INCLUDE_GTEST_FILE_REGEX.match(line)
        if m:
          # It's '#include "gtest/..."'.
          # There is no need to #include gtest.h as it has been
          # #included by gtest-all.cc.
          pass
        else:
          m = gtest.INCLUDE_SRC_FILE_REGEX.match(line)
          if m:
            # It's '#include "src/foo"' - let's process it recursively.
            ProcessFile(m.group(1))
          else:
            # Otherwise we copy the line unchanged to the output file.
            output_file.write(line)

ProcessFile(GMOCK_ALL_CC_SEED)

def FuseGMockGTestAllCc(gmock_root, output_dir):
  """Scans folder gmock_root to generate gmock-gtest-all.cc in output_dir."""

output_file = file(os.path.join(output_dir, GMOCK_GTEST_ALL_CC_OUTPUT), 'w')
  # First, fuse gtest-all.cc into gmock-gtest-all.cc.
  gtest.FuseGTestAllCcToFile(GetGTestRootDir(gmock_root), output_file)
  # Next, append fused gmock-all.cc to gmock-gtest-all.cc.
  FuseGMockAllCcToFile(gmock_root, output_file)
  output_file.close()

def FuseGMock(gmock_root, output_dir):
  """Fuses gtest.h, gmock.h, and gmock-gtest-all.h."""

ValidateGMockRootDir(gmock_root)
  ValidateOutputDir(output_dir)

gtest.FuseGTestH(GetGTestRootDir(gmock_root), output_dir)
  FuseGMockH(gmock_root, output_dir)
  FuseGMockGTestAllCc(gmock_root, output_dir)

def main():
  argc = len(sys.argv)
  if argc == 2:
    # fuse_gmock_files.py OUTPUT_DIR
    FuseGMock(DEFAULT_GMOCK_ROOT_DIR, sys.argv[1])
  elif argc == 3:
    # fuse_gmock_files.py GMOCK_ROOT_DIR OUTPUT_DIR
    FuseGMock(sys.argv[1], sys.argv[2])
  else:
    print __doc__
    sys.exit(1)

if __name__ == '__main__':
  main()

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