// glue code for using TS with ropey, this should be put behind a feature flag
// in the future (and potentially be partially removed)

use ropey::RopeSlice;
use tree_sitter::{Node, TextProvider};

// Adapter to convert rope chunks to bytes
pub struct ChunksBytes<'a> {
    chunks: ropey::iter::Chunks<'a>,
}
impl<'a> Iterator for ChunksBytes<'a> {
    type Item = &'a [u8];
    fn next(&mut self) -> Option<Self::Item> {
        self.chunks.next().map(str::as_bytes)
    }
}

pub struct RopeProvider<'a>(pub RopeSlice<'a>);

impl<'a> TextProvider<&'a [u8]> for RopeProvider<'a> {
    type I = ChunksBytes<'a>;

    fn text(&mut self, node: Node) -> Self::I {
        let fragment = self.0.byte_slice(node.start_byte()..node.end_byte());
        ChunksBytes {
            chunks: fragment.chunks(),
        }
    }
}