pomsky-syntax 0.12.0

Parser for pomsky, a new regular expression language
Documentation 
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use crate::Span;

use super::Rule;

#[derive(Debug, Clone)]
#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
pub struct Lookaround {
    pub kind: LookaroundKind,
    pub rule: Rule,
    pub span: Span,
}

#[derive(Debug, Clone, Copy, PartialEq, Eq)]
#[cfg_attr(feature = "arbitrary", derive(arbitrary::Arbitrary))]
pub enum LookaroundKind {
    Ahead,
    Behind,
    AheadNegative,
    BehindNegative,
}

impl Lookaround {
    pub(crate) fn new(rule: Rule, kind: LookaroundKind, span: Span) -> Self {
        Lookaround { kind, rule, span }
    }

    #[cfg(feature = "dbg")]
    pub(super) fn pretty_print(&self, buf: &mut crate::PrettyPrinter, needs_parens: bool) {
        let s = match self.kind {
            LookaroundKind::Ahead => ">>",
            LookaroundKind::Behind => "<<",
            LookaroundKind::AheadNegative => "!>>",
            LookaroundKind::BehindNegative => "!<<",
        };
        if needs_parens {
            buf.push('(');
            buf.start_indentation(s);
        } else {
            buf.push_str(s);
            buf.push(' ');
        }

        self.rule.pretty_print(buf, false);

        if needs_parens {
            buf.end_indentation(")");
        }
    }
}