// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

module.exports = grammar({
  name: "yts",

  rules: {
    source_file: ($) => repeat(choice($.line, $.comment)),
    line: ($) =>
      seq(
        $.command,
        repeat($.flag),
        $.id,
        $.title,
        $.date,
        $.author,
        $.duration,
        $.url,
        "\n",
      ),

    command: ($) =>
      choice(
        "pick",
        "p",
        "watch",
        "w",
        "watched",
        "wd",
        "add",
        "a",
        "drop",
        "d",
        "url",
        "u",
      ),
    flag: ($) =>
      choice(
        /-\w [^\s]+/,
        /-\w '[^']*'/,
        /-\w "[^"]*"/,
        /-\w=[^\s]+/,
        /-\w='[^']*'/,
        /-\w="[^"]*"/,

        /--\w[\w-]+ [^\s]+/,
        /--\w[\w-]+ '[^']*'/,
        /--\w[\w-]+ "[^"]*"/,
        /--\w[\w-]+=[^\s]+/,
        /--\w[\w-]+='[^']*'/,
        /--\w[\w-]+="[^"]*"/,
      ),
    id: ($) => /[a-z0-9]+/,
    title: ($) => seq($._q, /[^"]+/, $._q),
    date: ($) =>
      seq($._q, choice("[No release date]", /\d{4}-\d{2}-\d{2}/), $._q),
    author: ($) => seq($._q, choice("[No author]", /[^"]+/), $._q),
    duration: ($) =>
      seq($._q, seq(choice("[No duration]", /\d+m \d+s/, /\d+h \d+m/)), $._q),
    url: ($) => seq($._q, /[^"]+/, $._q),
    comment: ($) => /#.*/,
    _q: ($) => $.quote,
    quote: ($) => /"/,
  },
  extras: ($) => [/\s/],
});