futilehdl/src/parser/error.rs

use super::{IErr, Span};
use ariadne::{Label, Report, ReportKind};
use nom_greedyerror::{GreedyErrorKind, Position};

fn span_to_range(input: Span) -> std::ops::Range<usize> {
    input.position()..(input.position() + input.len())
}

pub fn convert_error(_input: Span, e: IErr<Span>) -> Report {
    let mut labels = Vec::new();
    for err in e.errors {
        let label = match err.1 {
            GreedyErrorKind::Context(ctx) => {
                Label::new(span_to_range(err.0)).with_message(format!("in {ctx}"))
            }
            GreedyErrorKind::Char(c) => Label::new(err.0.position()..err.0.position())
                .with_message(format!("expected {c:?}")),
            GreedyErrorKind::Nom(kind) => Label::new(err.0.position()..err.0.position())
                .with_message(format!("nom error {kind:?}")),
        };
        labels.push(label);
    }
    let mut rep = Report::build(ReportKind::Error, (), 0).with_message("Parse Error");
    for lbl in labels {
        rep = rep.with_label(lbl)
    }
    rep.finish()
}