#!/usr/bin/python
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"""Compile an .idl file to Blink V8 bindings (.h and .cpp files).

We are porting the IDL compiler from Perl to Python. The plan is as follows.
We will temporarily have two build flows (see ../derived_sources.gyp):
[1] Perl: deprecated_generate_bindings.pl, which calls:
    deprecated_idl_parser.pm => deprecated_code_generator_v8.pm
[2] Python: idl_compiler.py, which calls:
    IDL lexer => IDL parser => Python object builder =>
    interface dependency resolver => IDL semantic validator =>
    C++ code generator

We will move IDL files from the Perl build flow [1] to the Python build flow [2]
incrementally. See http://crbug.com/239771
"""
import optparse
import os
import shlex
import sys

import idl_reader
import code_generator_v8


def parse_options():
    parser = optparse.OptionParser()
    parser.add_option('--additional-idl-files')
    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 not None:
        # 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 main():
    options = parse_options()
    idl_filename = options.idl_filename
    basename = os.path.basename(idl_filename)
    interface_name, _ = os.path.splitext(basename)
    verbose = options.verbose
    if verbose:
        print idl_filename

    idl_definitions = idl_reader.read_idl_definitions(idl_filename, options.interface_dependencies_file, options.additional_idl_files)
    # FIXME: add parameters when add validator
    # idl_definitions = idl_reader.read_idl_interface(idl_filename, options.interface_dependencies_file, options.additional_idl_files, options.idl_attributes_file, verbose=verbose)
    if not idl_definitions:
        # We generate dummy .h and .cpp files just to tell build scripts
        # that outputs have been created.
        code_generator_v8.generate_dummy_header_and_cpp(interface_name, options.output_directory)
        return
    # FIXME: turn on code generator
    # Currently idl_definitions must be None (so dummy .h and .cpp files are
    # generated), as actual code generator not present yet.
    # code_generator_v8.write_interface(idl_definitions, interface_name, options.output_directory)
    raise RuntimeError('Stub: code generator not implemented yet')


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