Source/bindings/scripts/unstable/idl_compiler.py

#!/usr/bin/python
# Copyright (C) 2013 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Compile an .idl file to Blink V8 bindings (.h and .cpp files).

FIXME: Not currently used in build.
This is a rewrite of the Perl IDL compiler in Python, but is not complete.
Once it is complete, we will switch all IDL files over to Python at once.
Until then, please work on the Perl IDL compiler.
For details, see bug http://crbug.com/239771
"""

import optparse
import os
import pickle
import posixpath
import shlex
import sys

import code_generator_v8
import idl_reader

module_path, _ = os.path.split(__file__)
source_path = os.path.normpath(os.path.join(module_path, os.pardir, os.pardir, os.pardir))


def parse_options():
    parser = optparse.OptionParser()
    parser.add_option('--additional-idl-files')
    # FIXME: The --dump-json-and-pickle option is only for debugging and will
    # be removed once we complete migrating all IDL files from the Perl flow to
    # the Python flow.
    parser.add_option('--dump-json-and-pickle', action='store_true', default=False)
    parser.add_option('--idl-attributes-file')
    parser.add_option('--include', dest='idl_directories', action='append')
    parser.add_option('--output-directory')
    parser.add_option('--interface-dependencies-file')
    parser.add_option('--verbose', action='store_true', default=False)
    parser.add_option('--write-file-only-if-changed', type='int')
    # ensure output comes last, so command line easy to parse via regexes
    parser.disable_interspersed_args()

    options, args = parser.parse_args()
    if options.output_directory is None:
        parser.error('Must specify output directory using --output-directory.')
    if options.additional_idl_files is None:
        options.additional_idl_files = []
    else:
        # additional_idl_files is passed as a string with varied (shell-style)
        # quoting, hence needs parsing.
        options.additional_idl_files = shlex.split(options.additional_idl_files)
    if len(args) != 1:
        parser.error('Must specify exactly 1 input file as argument, but %d given.' % len(args))
    options.idl_filename = os.path.realpath(args[0])
    return options


def get_relative_dir_posix(filename):
    """Returns directory of a local file relative to Source, in POSIX format."""
    relative_path_local = os.path.relpath(filename, source_path)
    relative_dir_local = os.path.dirname(relative_path_local)
    return relative_dir_local.replace(os.path.sep, posixpath.sep)


def write_json_and_pickle(definitions, interface_name, output_directory):
    json_string = definitions.to_json()
    json_basename = interface_name + '.json'
    json_filename = os.path.join(output_directory, json_basename)
    with open(json_filename, 'w') as json_file:
        json_file.write(json_string)
    pickle_basename = interface_name + '.pkl'
    pickle_filename = os.path.join(output_directory, pickle_basename)
    with open(pickle_filename, 'wb') as pickle_file:
        pickle.dump(definitions, pickle_file)


def main():
    options = parse_options()
    idl_filename = options.idl_filename
    basename = os.path.basename(idl_filename)
    interface_name, _ = os.path.splitext(basename)
    output_directory = options.output_directory
    verbose = options.verbose
    if verbose:
        print idl_filename
    relative_dir_posix = get_relative_dir_posix(idl_filename)

    reader = idl_reader.IdlReader(options.interface_dependencies_file, options.additional_idl_files, options.idl_attributes_file, output_directory, verbose)
    definitions = reader.read_idl_definitions(idl_filename)
    code_generator = code_generator_v8.CodeGeneratorV8(definitions, interface_name, options.output_directory, relative_dir_posix, options.idl_directories, verbose)
    if not definitions:
        # We generate dummy .h and .cpp files just to tell build scripts
        # that outputs have been created.
        code_generator.write_dummy_header_and_cpp()
        return
    if options.dump_json_and_pickle:
        write_json_and_pickle(definitions, interface_name, output_directory)
        return
    code_generator.write_header_and_cpp()


if __name__ == '__main__':
    sys.exit(main())