yamd 0.18.1

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use crate::{
    lexer::{Token, TokenKind},
    op::Parser,
    op::{Node, Op},
};

fn is_underscore(t: &Token) -> bool {
    t.kind == TokenKind::Underscore && t.range.len() == 1
}

pub fn italic(p: &mut Parser) -> bool {
    let start = p.pos;
    let Some(start_range) = p.eat(is_underscore) else {
        return false;
    };
    let Some((body_range, end_range)) = p.advance_until(is_underscore) else {
        p.pos = start;
        return false;
    };
    let start_content = p.span(start_range);
    let body_content = p.span(body_range);
    let end_content = p.span(end_range);
    p.ops.push(Op::new_start(Node::Italic, start_content));
    p.ops.push(Op::new_value(body_content));
    p.ops.push(Op::new_end(Node::Italic, end_content));
    true
}

#[cfg(test)]
mod tests {
    use crate::{
        lexer::{Position, Token, TokenKind},
        op::{Node, Op, Parser, italic::italic, parser::StopCondition},
    };

    #[test]
    fn happy_path() {
        let mut p: Parser = "_happy_".into();
        assert!(italic(&mut p));
        assert_eq!(
            p.ops,
            vec![
                Op::new_start(Node::Italic, p.span(0..1)),
                Op::new_value(p.span(1..2)),
                Op::new_end(Node::Italic, p.span(2..3))
            ]
        );
    }

    #[test]
    fn no_closing_token() {
        let mut p: Parser = "_happy".into();
        assert!(!italic(&mut p));
        assert!(p.ops.is_empty());
        assert_eq!(
            p.peek(),
            Some((
                0,
                &Token::new(TokenKind::Underscore, 0..1, Position::default()),
            ))
        )
    }

    #[test]
    fn terminator() {
        let mut p: Parser = "_ha\n\nppy_".into();
        p.with_eof(StopCondition::Terminator, |p| {
            assert!(!italic(p));
            assert!(p.ops.is_empty());
            assert_eq!(
                p.peek(),
                Some((
                    0,
                    &Token::new(TokenKind::Underscore, 0..1, Position::default())
                ))
            );
        });
    }
}