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/*
* parsing/rule/impls/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_LINE_BREAK: Rule = Rule {
name: "line-break",
position: LineRequirement::Any,
try_consume_fn: line_break,
};
pub const RULE_LINE_BREAK_PARAGRAPH: Rule = Rule {
name: "line-break-paragraph",
position: LineRequirement::Any,
try_consume_fn: line_break_paragraph,
};
fn line_break<'r, 't>(parser: &mut Parser<'r, 't>) -> ParseResult<'r, 't, Elements<'t>> {
debug!("Consuming newline token as line break");
// Skip this newline if we're coming up on a rule that starts
// on its own line.
//
// Grep for "LineRequirement::StartOfLine" and compare that with this list.
let upcoming_skip = parser.evaluate_fn(|parser| {
parser.step()?;
parser.get_optional_space()?;
Ok(matches!(
parser.current().token,
Token::Quote
| Token::BulletItem
| Token::NumberedItem
| Token::Heading
| Token::Equals
| Token::TripleDash
| Token::ClearFloatLeft
| Token::ClearFloatRight
| Token::ClearFloatBoth
| Token::TableColumn
| Token::TableColumnRight
| Token::TableColumnCenter
| Token::TableColumnTitle
))
});
if upcoming_skip {
debug!("Skipping line break element because of upcoming token");
return ok!(Elements::None);
}
ok!(Element::LineBreak)
}
#[inline]
fn line_break_paragraph<'r, 't>(
parser: &mut Parser<'r, 't>,
) -> ParseResult<'r, 't, Elements<'t>> {
// This rule is kind of special. It's the same as RULE_LINE_BREAK,
// except it accepts a *ParagraphBreak* instead, which is normally supposed to split
// paragraphs.
//
// So what's going on?
//
// In "normal" contexts, you extract paragraphs (see gather_paragraphs()), so any
// Token::ParagraphBreak tokens are used to affected the ParagraphStack and create
// a new paragraph container.
//
// However other contexts do not allow new paragraphs to form, such as [[span]].
// In these cases, if we encounter two or more newlines, we must pretend it's simply
// one regular newline, or a line break.
line_break(parser)
}