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37 lines
1.2 KiB
Rust
37 lines
1.2 KiB
Rust
use crate::{Range, RopeSlice, Selection, Syntax};
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// TODO: to contract_selection we'd need to store the previous ranges before expand.
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// Maybe just contract to the first child node?
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pub fn expand_selection(syntax: &Syntax, text: RopeSlice, selection: &Selection) -> Selection {
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let tree = syntax.tree();
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selection.clone().transform(|range| {
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let from = text.char_to_byte(range.from());
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let to = text.char_to_byte(range.to());
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// find parent of a descendant that matches the range
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let parent = match tree
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.root_node()
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.descendant_for_byte_range(from, to)
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.and_then(|node| {
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if node.child_count() == 0 || (node.start_byte() == from && node.end_byte() == to) {
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node.parent()
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} else {
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Some(node)
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}
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}) {
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Some(parent) => parent,
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None => return range,
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};
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let from = text.byte_to_char(parent.start_byte());
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let to = text.byte_to_char(parent.end_byte());
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if range.head < range.anchor {
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Range::new(to, from)
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} else {
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Range::new(from, to)
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}
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})
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}
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