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use {TextUnit, File, EditBuilder, Edit};
use libsyntax2::{
ast::AstNode,
SyntaxKind::COMMA,
SyntaxNodeRef,
algo::{
Direction, siblings,
find_leaf_at_offset,
},
};
pub fn flip_comma<'a>(file: &'a File, offset: TextUnit) -> Option<impl FnOnce() -> Edit + 'a> {
let syntax = file.syntax();
let syntax = syntax.as_ref();
let comma = find_leaf_at_offset(syntax, offset).find(|leaf| leaf.kind() == COMMA)?;
let left = non_trivia_sibling(comma, Direction::Backward)?;
let right = non_trivia_sibling(comma, Direction::Forward)?;
Some(move || {
let mut edit = EditBuilder::new();
edit.replace(left.range(), right.text());
edit.replace(right.range(), left.text());
edit.finish()
})
}
fn non_trivia_sibling(node: SyntaxNodeRef, direction: Direction) -> Option<SyntaxNodeRef> {
siblings(node, direction)
.skip(1)
.find(|node| !node.kind().is_trivia())
}
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