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#!/usr/bin/env python
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Code generator for PlatformObject<> constructor list.
This script takes as arguments a list of platform names as a text file and
a list of types and generates a C++ source file containing a list of
the constructors for that object in platform order.
Example Output: ./ui/ozone/generate_constructor_list.py \
--platform test \
--platform dri \
--export OZONE \
--namespace ui \
--typename OzonePlatform \
--include '"ui/ozone/ozone_platform.h"'
// DO NOT MODIFY. GENERATED BY generate_constructor_list.py
#include "ui/ozone/platform_object_internal.h"
#include "ui/ozone/ozone_platform.h"
namespace ui {
OzonePlatform* CreateOzonePlatformTest();
OzonePlatform* CreateOzonePlatformDri();
} // namespace ui
namespace ui {
typedef ui::OzonePlatform* (*OzonePlatformConstructor)();
template <> const OzonePlatformConstructor
PlatformConstructorList<ui::OzonePlatform>::kConstructors[] = {
&ui::CreateOzonePlatformTest,
&ui::CreateOzonePlatformDri,
};
template class COMPONENT_EXPORT(OZONE) PlatformObject<ui::OzonePlatform>;
} // namespace ui
"""
try:
from StringIO import StringIO # for Python 2
except ImportError:
from io import StringIO # for Python 3
import optparse
import os
import collections
import re
import sys
def GetTypedefName(typename):
"""Determine typedef name of constructor for typename.
This is just typename + "Constructor".
"""
return typename + 'Constructor'
def GetConstructorName(typename, platform):
"""Determine name of static constructor function from platform name.
This is just "Create" + typename + platform.
"""
return 'Create' + typename + platform.capitalize()
def GenerateConstructorList(out, namespace, export, typenames, platforms,
includes, usings):
"""Generate static array containing a list of constructors."""
out.write('// DO NOT MODIFY. GENERATED BY generate_constructor_list.py\n')
out.write('\n')
out.write('#include "ui/ozone/platform_object_internal.h"\n')
out.write('\n')
for include in includes:
out.write('#include %(include)s\n' % {'include': include})
out.write('\n')
for using in usings:
out.write('using %(using)s;\n' % {'using': using})
out.write('\n')
out.write('namespace %(namespace)s {\n' % {'namespace': namespace})
out.write('\n')
# Declarations of constructor functions.
for typename in typenames:
for platform in platforms:
constructor = GetConstructorName(typename, platform)
out.write('%(typename)s* %(constructor)s();\n'
% {'typename': typename,
'constructor': constructor})
out.write('\n')
out.write('} // namespace %(namespace)s\n' % {'namespace': namespace})
out.write('\n')
out.write('namespace ui {\n')
out.write('\n')
# Handy typedefs for constructor types.
for typename in typenames:
out.write('typedef %(typename)s* (*%(typedef)s)();\n'
% {'typename': typename,
'typedef': GetTypedefName(typename)})
out.write('\n')
# The actual constructor lists.
for typename in typenames:
out.write('template <> const %(typedef)s\n'
% {'typedef': GetTypedefName(typename)})
out.write('PlatformConstructorList<%(typename)s>::kConstructors[] = {\n'
% {'typename': typename})
for platform in platforms:
constructor = GetConstructorName(typename, platform)
out.write(' &%(namespace)s::%(constructor)s,\n'
% {'namespace': namespace, 'constructor': constructor})
out.write('};\n')
out.write('\n')
# Exported template instantiation.
for typename in typenames:
out.write('template class COMPONENT_EXPORT(%(export)s)' \
' PlatformObject<%(typename)s>;\n'
% {'export': export, 'typename': typename})
out.write('\n')
out.write('} // namespace ui\n')
out.write('\n')
def main(argv):
parser = optparse.OptionParser()
parser.add_option('--namespace', default='ozone')
parser.add_option('--export', default='OZONE')
parser.add_option('--platform_list')
parser.add_option('--output_cc')
parser.add_option('--include', action='append', default=[])
parser.add_option('--platform', action='append', default=[])
parser.add_option('--typename', action='append', default=[])
parser.add_option('--using', action='append', default=[])
options, _ = parser.parse_args(argv)
platforms = list(options.platform)
typenames = list(options.typename)
includes = list(options.include)
usings = list(options.using)
if options.platform_list:
platforms = open(options.platform_list, 'r').read().strip().split('\n')
if not platforms:
sys.stderr.write('No platforms are selected!')
sys.exit(1)
# Write to standard output or file specified by --output_cc.
out_cc = getattr(sys.stdout, 'buffer', sys.stdout)
if options.output_cc:
out_cc = open(options.output_cc, 'wb')
out_cc_str = StringIO()
GenerateConstructorList(out_cc_str, options.namespace, options.export,
typenames, platforms, includes, usings)
out_cc.write(out_cc_str.getvalue().encode('utf-8'))
if options.output_cc:
out_cc.close()
return 0
if __name__ == '__main__':
sys.exit(main(sys.argv[1:]))
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