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#!/usr/bin/env python
# Copyright (c) 2012 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++ structs from api json files.
The purpose of this tool is to remove the need for hand-written code that
converts to and from base::Value types when receiving javascript api calls.
Originally written for generating code for extension apis. Reference schemas
are in chrome/common/extensions/api.
Usage example:
compiler.py --root /home/Work/src --namespace extensions windows.json
tabs.json
compiler.py --destdir gen --root /home/Work/src
--namespace extensions windows.json tabs.json
"""
import optparse
import os
import sys
from cpp_bundle_generator import CppBundleGenerator
from cpp_generator import CppGenerator
from cpp_type_generator import CppTypeGenerator
from dart_generator import DartGenerator
import json_schema
from model import Model, UnixName
from schema_loader import SchemaLoader
# Names of supported code generators, as specified on the command-line.
# First is default.
GENERATORS = ['cpp', 'cpp-bundle', 'dart']
def GenerateSchema(generator,
filenames,
root,
destdir,
root_namespace,
dart_overrides_dir):
schema_loader = SchemaLoader(os.path.dirname(os.path.relpath(
os.path.normpath(filenames[0]), root)))
# Merge the source files into a single list of schemas.
api_defs = []
for filename in filenames:
schema = os.path.normpath(filename)
schema_filename, schema_extension = os.path.splitext(schema)
path, short_filename = os.path.split(schema_filename)
api_def = schema_loader.LoadSchema(schema)
# If compiling the C++ model code, delete 'nocompile' nodes.
if generator == 'cpp':
api_def = json_schema.DeleteNodes(api_def, 'nocompile')
api_defs.extend(api_def)
api_model = Model()
# For single-schema compilation make sure that the first (i.e. only) schema
# is the default one.
default_namespace = None
# Load the actual namespaces into the model.
for target_namespace, schema_filename in zip(api_defs, filenames):
relpath = os.path.relpath(os.path.normpath(schema_filename), root)
namespace = api_model.AddNamespace(target_namespace,
relpath,
include_compiler_options=True)
if default_namespace is None:
default_namespace = namespace
path, filename = os.path.split(schema_filename)
short_filename, extension = os.path.splitext(filename)
# Filenames are checked against the unix_names of the namespaces they
# generate because the gyp uses the names of the JSON files to generate
# the names of the .cc and .h files. We want these to be using unix_names.
if namespace.unix_name != short_filename:
sys.exit("Filename %s is illegal. Name files using unix_hacker style." %
schema_filename)
# The output filename must match the input filename for gyp to deal with it
# properly.
out_file = namespace.unix_name
# Construct the type generator with all the namespaces in this model.
type_generator = CppTypeGenerator(api_model,
schema_loader,
default_namespace=default_namespace)
if generator == 'cpp-bundle':
cpp_bundle_generator = CppBundleGenerator(root,
api_model,
api_defs,
type_generator,
root_namespace)
generators = [
('generated_api.cc', cpp_bundle_generator.api_cc_generator),
('generated_api.h', cpp_bundle_generator.api_h_generator),
('generated_schemas.cc', cpp_bundle_generator.schemas_cc_generator),
('generated_schemas.h', cpp_bundle_generator.schemas_h_generator)
]
elif generator == 'cpp':
cpp_generator = CppGenerator(type_generator, root_namespace)
generators = [
('%s.h' % namespace.unix_name, cpp_generator.h_generator),
('%s.cc' % namespace.unix_name, cpp_generator.cc_generator)
]
elif generator == 'dart':
generators = [
('%s.dart' % namespace.unix_name, DartGenerator(
dart_overrides_dir))
]
else:
raise Exception('Unrecognised generator %s' % generator)
output_code = []
for filename, generator in generators:
code = generator.Generate(namespace).Render()
if destdir:
with open(os.path.join(destdir, namespace.source_file_dir,
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++ model of an API 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_api_schemas',
help='C++ namespace for generated files. e.g extensions::api.')
parser.add_option('-g', '--generator', default=GENERATORS[0],
choices=GENERATORS,
help='The generator to use to build the output code. Supported values are'
' %s' % GENERATORS)
parser.add_option('-D', '--dart-overrides-dir', dest='dart_overrides_dir',
help='Adds custom dart from files in the given directory (Dart only).')
(opts, filenames) = parser.parse_args()
if not filenames:
sys.exit(0) # This is OK as a no-op
# Unless in bundle mode, only one file should be specified.
if opts.generator != 'cpp-bundle' and len(filenames) > 1:
# TODO(sashab): Could also just use filenames[0] here and not complain.
raise Exception(
"Unless in bundle mode, only one file can be specified at a time.")
result = GenerateSchema(opts.generator, filenames, opts.root, opts.destdir,
opts.namespace, opts.dart_overrides_dir)
if not opts.destdir:
print result
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