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use libsyntax2::{
File, TextRange, SyntaxNodeRef,
SyntaxKind::WHITESPACE,
algo::{find_leaf_at_offset, find_covering_node, ancestors},
};
pub fn extend_selection(file: &File, range: TextRange) -> Option<TextRange> {
let syntax = file.syntax();
extend(syntax.borrowed(), range)
}
pub(crate) fn extend(root: SyntaxNodeRef, range: TextRange) -> Option<TextRange> {
if range.is_empty() {
let offset = range.start();
let mut leaves = find_leaf_at_offset(root, offset);
if let Some(leaf) = leaves.clone().find(|node| node.kind() != WHITESPACE) {
return Some(leaf.range());
}
let ws = leaves.next()?;
let ws_text = ws.leaf_text().unwrap();
let range = TextRange::from_to(offset, ws.range().end()) - ws.range().start();
let ws_suffix = &ws_text.as_str()[range];
if ws_text.contains("\n") && !ws_suffix.contains("\n") {
if let Some(node) = ws.next_sibling() {
return Some(node.range());
}
}
return Some(ws.range());
};
let node = find_covering_node(root, range);
match ancestors(node).skip_while(|n| n.range() == range).next() {
None => None,
Some(parent) => Some(parent.range()),
}
}
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