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/*
 * parsing/rule/impls/block/blocks/equation_ref.rs
 *
 * ftml - Library to parse Wikidot text
 * Copyright (C) 2019-2022 Wikijump Team
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

use super::prelude::*;

pub const BLOCK_EQUATION_REF: BlockRule = BlockRule {
    name: "block-equation-ref",
    accepts_names: &["equation", "eref", "eqref"],
    accepts_star: false,
    accepts_score: false,
    accepts_newlines: false,
    parse_fn,
};

fn parse_fn<'r, 't>(
    parser: &mut Parser<'r, 't>,
    name: &'t str,
    flag_star: bool,
    flag_score: bool,
    in_head: bool,
) -> ParseResult<'r, 't, Elements<'t>> {
    info!("Parsing equation reference block (name '{name}', in-head {in_head})");
    assert!(!flag_star, "Equation reference doesn't allow start flag");
    assert!(!flag_score, "Equation reference doesn't allow score flag");
    assert_block_name(&BLOCK_EQUATION_REF, name);

    let name =
        parser.get_head_value(
            &BLOCK_EQUATION_REF,
            in_head,
            |parser, value| match value {
                Some(name) => Ok(name.trim()),
                None => Err(parser.make_err(ParseErrorKind::BlockMissingArguments)),
            },
        )?;

    ok!(Element::EquationReference(cow!(name)))
}