# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.

from __future__ import absolute_import
import re
import sys


def read_reserved_word_list(filename):
    macro_pat = re.compile(r"^\s*MACRO\(([^,]+), *[^,]+, *[^\)]+\)\s*\\?$")

    reserved_word_list = []
    with open(filename, "r") as f:
        for line in f:
            m = macro_pat.search(line)
            if m:
                reserved_word_list.append(m.group(1))

    assert len(reserved_word_list) != 0

    return reserved_word_list


def line(opt, s):
    opt["output"].write("{}\n".format(s))


def main(output, reserved_words_h):
    reserved_word_list = read_reserved_word_list(reserved_words_h)
    opt = {"output": output}

    line(opt, "const JS_RESERVED_WORDS = [")
    for word in reserved_word_list:
        line(opt, '  "{}",'.format(word))
    line(opt, "];")
    line(opt, "module.exports = JS_RESERVED_WORDS;")


if __name__ == "__main__":
    main(sys.stdout, *sys.argv[1:])
