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/*
* parsing/rule/impls/underscore_line_break.rs
*
* ftml - Library to parse Wikidot text
* Copyright (C) 2019-2026 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 RULE_UNDERSCORE_LINE_BREAK: Rule = Rule {
name: "underscore-line-break",
position: LineRequirement::Any,
try_consume_fn,
};
fn try_consume_fn<'r, 't>(
parser: &mut Parser<'r, 't>,
) -> ParseResult<'r, 't, Elements<'t>> {
debug!("Trying to parse underscore line break");
// These can start in two ways:
// Either a space, or start of line.
//
// Put in a regex-like syntax, we want:
// " "? ~ "_" ~ "\n"
//
// So if it's not newline-based, we step to get onto the underscore.
match parser.next_two_tokens() {
(Token::Whitespace, Some(Token::Underscore)) => {
parser.step()?;
}
(Token::Underscore, Some(_)) if parser.start_of_line() => (),
_ => return Err(parser.make_err(ParseErrorKind::RuleFailed)),
}
// Now the current token should be underscore, then newline.
if !matches!(
parser.next_two_tokens(),
(
Token::Underscore,
Some(Token::LineBreak | Token::ParagraphBreak),
),
) {
return Err(parser.make_err(ParseErrorKind::RuleFailed));
}
// Since we know where we are, we can step over them, then be done.
parser.step_n(2)?;
ok!(Element::LineBreak)
}