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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 cc_generator
import cpp_type_generator
import h_generator
import idl_schema
import json_schema
import model
import schema_bundle_generator
import optparse
import os.path
import sys
def load_schema(schema):
schema_filename, schema_extension = os.path.splitext(schema)
if schema_extension == '.json':
api_defs = json_schema.Load(schema)
elif schema_extension == '.idl':
api_defs = idl_schema.Load(schema)
else:
sys.exit("Did not recognize file extension %s for schema %s" %
(schema_extension, schema))
if len(api_defs) != 1:
sys.exit("File %s has multiple schemas. Files are only allowed to contain a"
" single schema." % schema)
return api_defs
def handle_single_schema(filename, dest_dir, root, root_namespace):
schema = os.path.normpath(filename)
schema_filename, schema_extension = os.path.splitext(schema)
path, short_filename = os.path.split(schema_filename)
api_defs = json_schema.DeleteNocompileNodes(load_schema(schema))
api_model = model.Model()
for target_namespace in api_defs:
referenced_schemas = target_namespace.get('dependencies', [])
# Load type dependencies into the model.
# TODO(miket): do we need this in IDL?
for referenced_schema in referenced_schemas:
split_schema = referenced_schema.split(':', 1)
if len(split_schema) > 1:
if split_schema[0] != 'api':
continue
else:
referenced_schema = split_schema[1]
referenced_schema_path = os.path.join(
os.path.dirname(schema), referenced_schema + '.json')
referenced_api_defs = json_schema.Load(referenced_schema_path)
for namespace in referenced_api_defs:
api_model.AddNamespace(namespace,
os.path.relpath(referenced_schema_path, opts.root))
# Gets the relative path from opts.root to the schema to correctly determine
# the include path.
relpath = os.path.relpath(schema, opts.root)
namespace = api_model.AddNamespace(target_namespace, relpath)
if not namespace:
continue
if short_filename != namespace.unix_name:
sys.exit("Filename %s is illegal. Name files using unix_hacker style." %
filename)
# The output filename must match the input filename for gyp to deal with it
# properly.
out_file = namespace.unix_name
type_generator = cpp_type_generator.CppTypeGenerator(
root_namespace, namespace, namespace.unix_name)
for referenced_namespace in api_model.namespaces.values():
if referenced_namespace == namespace:
continue
type_generator.AddNamespace(
referenced_namespace,
referenced_namespace.unix_name)
h_code = (h_generator.HGenerator(namespace, type_generator)
.Generate().Render())
cc_code = (cc_generator.CCGenerator(namespace, type_generator)
.Generate().Render())
if dest_dir:
with open(
os.path.join(dest_dir, namespace.source_file_dir, out_file + '.cc'),
'w') as cc_file:
cc_file.write(cc_code)
with open(
os.path.join(dest_dir, namespace.source_file_dir, out_file + '.h'),
'w') as h_file:
h_file.write(h_code)
else:
print '%s.h' % out_file
print
print h_code
print
print '%s.cc' % out_file
print
print cc_code
def handle_bundle_schema(filenames, dest_dir, root, root_namespace):
# 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)
api_defs.extend(load_schema(schema))
api_model = model.Model()
relpath = os.path.relpath(os.path.normpath(filenames[0]), root)
for target_namespace, schema_filename in zip(api_defs, filenames):
namespace = api_model.AddNamespace(target_namespace, relpath)
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)
type_generator = cpp_type_generator.CppTypeGenerator(root_namespace)
for referenced_namespace in api_model.namespaces.values():
type_generator.AddNamespace(
referenced_namespace,
referenced_namespace.unix_name)
generator = schema_bundle_generator.SchemaBundleGenerator(
api_model, api_defs, type_generator)
api_h_code = generator.GenerateAPIHeader().Render()
schemas_h_code = generator.GenerateSchemasHeader().Render()
schemas_cc_code = generator.GenerateSchemasCC().Render()
if dest_dir:
basedir = os.path.join(dest_dir, 'chrome/common/extensions/api')
with open(os.path.join(basedir, 'generated_api.h'), 'w') as h_file:
h_file.write(api_h_code)
with open(os.path.join(basedir, 'generated_schemas.h'), 'w') as h_file:
h_file.write(schemas_h_code)
with open(os.path.join(basedir, 'generated_schemas.cc'), 'w') as cc_file:
cc_file.write(schemas_cc_code)
else:
print 'generated_api.h'
print
print api_h_code
print
print 'generated_schemas.h'
print
print schemas_h_code
print
print 'generated_schemas.cc'
print
print schemas_cc_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('-b', '--bundle', action="store_true", help=
'''if supplied, causes compiler to generate bundle files for the given set of
source files.''')
(opts, args) = parser.parse_args()
if not args:
sys.exit(0) # This is OK as a no-op
dest_dir = opts.destdir
root_namespace = opts.namespace
if opts.bundle:
handle_bundle_schema(args, dest_dir, opts.root, root_namespace)
else:
handle_single_schema(args[0], dest_dir, opts.root, root_namespace)
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