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#!/usr/bin/env python
# Copyright 2016 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Generates a JSON typemap from its command-line arguments and dependencies.
Each typemap should be specified in an command-line argument of the form
key=value, with an argument of "--start-typemap" preceding each typemap.
For example,
generate_type_mappings.py --output=foo.typemap --start-typemap \\
public_headers=foo.h traits_headers=foo_traits.h \\
type_mappings=mojom.Foo=FooImpl
generates a foo.typemap containing
{
"c++": {
"mojom.Foo": {
"typename": "FooImpl",
"traits_headers": [
"foo_traits.h"
],
"public_headers": [
"foo.h"
]
}
}
}
Then,
generate_type_mappings.py --dependency foo.typemap --output=bar.typemap \\
--start-typemap public_headers=bar.h traits_headers=bar_traits.h \\
type_mappings=mojom.Bar=BarImpl
generates a bar.typemap containing
{
"c++": {
"mojom.Bar": {
"typename": "BarImpl",
"traits_headers": [
"bar_traits.h"
],
"public_headers": [
"bar.h"
]
},
"mojom.Foo": {
"typename": "FooImpl",
"traits_headers": [
"foo_traits.h"
],
"public_headers": [
"foo.h"
]
}
}
}
"""
import argparse
import json
import os
import re
import sys
sys.path.insert(
0,
os.path.join(
os.path.dirname(os.path.dirname(os.path.abspath(__file__))), "mojom"))
from mojom.generate.generator import WriteFile
def ReadTypemap(path):
with open(path) as f:
return json.load(f)['c++']
def LoadCppTypemapConfig(path):
configs = {}
with open(path) as f:
for config in json.load(f):
for entry in config['types']:
configs[entry['mojom']] = {
'typename': entry['cpp'],
'forward_declaration': entry.get('forward_declaration', None),
'public_headers': config.get('traits_headers', []),
'traits_headers': config.get('traits_private_headers', []),
'copyable_pass_by_value': entry.get('copyable_pass_by_value',
False),
'default_constructible': entry.get('default_constructible', True),
'force_serialize': entry.get('force_serialize', False),
'hashable': entry.get('hashable', False),
'move_only': entry.get('move_only', False),
'nullable_is_same_type': entry.get('nullable_is_same_type', False),
'non_copyable_non_movable': False,
}
return configs
def main():
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.RawDescriptionHelpFormatter)
parser.add_argument(
'--dependency',
type=str,
action='append',
default=[],
help=('A path to another JSON typemap to merge into the output. '
'This may be repeated to merge multiple typemaps.'))
parser.add_argument(
'--cpp-typemap-config',
type=str,
action='store',
dest='cpp_config_path',
help=('A path to a single JSON-formatted typemap config as emitted by'
'GN when processing a mojom_cpp_typemap build rule.'))
parser.add_argument('--output',
type=str,
required=True,
help='The path to which to write the generated JSON.')
params, _ = parser.parse_known_args()
typemaps = {}
if params.cpp_config_path:
typemaps = LoadCppTypemapConfig(params.cpp_config_path)
missing = [path for path in params.dependency if not os.path.exists(path)]
if missing:
raise IOError('Missing dependencies: %s' % ', '.join(missing))
for path in params.dependency:
typemaps.update(ReadTypemap(path))
WriteFile(json.dumps({'c++': typemaps}, indent=2), params.output)
if __name__ == '__main__':
main()
|
