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- #!/usr/bin/env python3
- # Copyright 2013 The Chromium Authors. All rights reserved.
- # Use of this source code is governed by a BSD-style license that can be
- # found in the LICENSE file.
- """Generator for C++ features from json files.
- Usage example:
- features_compiler.py --destdir gen --root /home/Work/src _permissions.json
- """
- from __future__ import print_function
- import optparse
- import os
- from schema_loader import SchemaLoader
- from features_cc_generator import CCGenerator
- from features_h_generator import HGenerator
- from model import CreateFeature
- def _GenerateSchema(filename, root, destdir, namespace):
- """Generates C++ features files from the json file |filename|.
- """
- # Load in the feature permissions from the JSON file.
- schema = os.path.normpath(filename)
- schema_loader = SchemaLoader(os.path.dirname(os.path.relpath(schema, root)),
- os.path.dirname(schema),
- [],
- None)
- schema_filename = os.path.splitext(schema)[0]
- feature_defs = schema_loader.LoadSchema(schema)
- # Generate a list of the features defined and a list of their models.
- feature_list = []
- for feature_def, feature in feature_defs.items():
- feature_list.append(CreateFeature(feature_def, feature))
- source_file_dir, _ = os.path.split(schema)
- relpath = os.path.relpath(os.path.normpath(source_file_dir), root)
- full_path = os.path.join(relpath, schema)
- generators = [
- ('%s.cc' % schema_filename, CCGenerator()),
- ('%s.h' % schema_filename, HGenerator())
- ]
- # Generate and output the code for all features.
- output_code = []
- for filename, generator in generators:
- code = generator.Generate(feature_list, full_path, namespace).Render()
- if destdir:
- with open(os.path.join(destdir, relpath, filename), 'w') as f:
- f.write(code)
- output_code += [filename, '', code, '']
- return '\n'.join(output_code)
- if __name__ == '__main__':
- parser = optparse.OptionParser(
- description='Generates a C++ features model from JSON schema',
- usage='usage: %prog [option]... schema')
- parser.add_option('-r', '--root', default='.',
- help='logical include root directory. Path to schema files from '
- 'specified dir will be the include path.')
- parser.add_option('-d', '--destdir',
- help='root directory to output generated files.')
- parser.add_option('-n', '--namespace', default='generated_features',
- help='C++ namespace for generated files. e.g extensions::api.')
- (opts, filenames) = parser.parse_args()
- # Only one file is currently specified.
- if len(filenames) != 1:
- raise ValueError('One (and only one) file is required (for now).')
- result = _GenerateSchema(filenames[0], opts.root, opts.destdir,
- opts.namespace)
- if not opts.destdir:
- print(result)
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