mirror of https://github.com/helix-editor/helix
commands: Implement expand_selection.
parent
33c67f1388
commit
6cfb1acb9d
@ -0,0 +1,32 @@
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use crate::{Range, RopeSlice, Selection, Syntax};
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use smallvec::smallvec;
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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.root_layer.tree.as_ref().unwrap();
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selection.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| node.parent())
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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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