1 #!/usr/bin/env python 2 # Copyright 2013 The Chromium Authors. All rights reserved. 3 # Use of this source code is governed by a BSD-style license that can be 4 # found in the LICENSE file. 5 """Generator for C++ features from json files. 6 7 Usage example: 8 features_compiler.py --destdir gen --root /home/Work/src _permissions.json 9 """ 10 11 import optparse 12 import os 13 14 from schema_loader import SchemaLoader 15 from features_cc_generator import CCGenerator 16 from features_h_generator import HGenerator 17 from model import CreateFeature 18 19 20 def _GenerateSchema(filename, root, destdir, namespace): 21 """Generates C++ features files from the json file |filename|. 22 """ 23 # Load in the feature permissions from the JSON file. 24 schema = os.path.normpath(filename) 25 schema_loader = SchemaLoader(os.path.dirname(os.path.relpath(schema, root)), 26 os.path.dirname(schema)) 27 schema_filename = os.path.splitext(schema)[0] 28 feature_defs = schema_loader.LoadSchema(schema) 29 30 # Generate a list of the features defined and a list of their models. 31 feature_list = [] 32 for feature_def, feature in feature_defs.iteritems(): 33 feature_list.append(CreateFeature(feature_def, feature)) 34 35 source_file_dir, _ = os.path.split(schema) 36 relpath = os.path.relpath(os.path.normpath(source_file_dir), root) 37 full_path = os.path.join(relpath, schema) 38 39 generators = [ 40 ('%s.cc' % schema_filename, CCGenerator()), 41 ('%s.h' % schema_filename, HGenerator()) 42 ] 43 44 # Generate and output the code for all features. 45 output_code = [] 46 for filename, generator in generators: 47 code = generator.Generate(feature_list, full_path, namespace).Render() 48 if destdir: 49 with open(os.path.join(destdir, relpath, filename), 'w') as f: 50 f.write(code) 51 output_code += [filename, '', code, ''] 52 53 return '\n'.join(output_code) 54 55 56 if __name__ == '__main__': 57 parser = optparse.OptionParser( 58 description='Generates a C++ features model from JSON schema', 59 usage='usage: %prog [option]... schema') 60 parser.add_option('-r', '--root', default='.', 61 help='logical include root directory. Path to schema files from ' 62 'specified dir will be the include path.') 63 parser.add_option('-d', '--destdir', 64 help='root directory to output generated files.') 65 parser.add_option('-n', '--namespace', default='generated_features', 66 help='C++ namespace for generated files. e.g extensions::api.') 67 (opts, filenames) = parser.parse_args() 68 69 # Only one file is currently specified. 70 if len(filenames) != 1: 71 raise ValueError('One (and only one) file is required (for now).') 72 73 result = _GenerateSchema(filenames[0], opts.root, opts.destdir, 74 opts.namespace) 75 if not opts.destdir: 76 print result 77
