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use crate::{syntax::TreeCursor, Range, RopeSlice, Selection, Syntax};
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pub fn expand_selection(syntax: &Syntax, text: RopeSlice, selection: Selection) -> Selection {
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let cursor = &mut syntax.walk();
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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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let byte_range = from..to;
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cursor.reset_to_byte_range(from, to);
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while cursor.node().byte_range() == byte_range {
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if !cursor.goto_parent() {
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break;
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}
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}
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let node = cursor.node();
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let from = text.byte_to_char(node.start_byte());
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let to = text.byte_to_char(node.end_byte());
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Range::new(to, from).with_direction(range.direction())
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})
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}
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pub fn shrink_selection(syntax: &Syntax, text: RopeSlice, selection: Selection) -> Selection {
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select_node_impl(syntax, text, selection, |cursor| {
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cursor.goto_first_child();
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})
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}
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pub fn select_next_sibling(syntax: &Syntax, text: RopeSlice, selection: Selection) -> Selection {
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select_node_impl(syntax, text, selection, |cursor| {
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while !cursor.goto_next_sibling() {
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if !cursor.goto_parent() {
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break;
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}
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}
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})
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}
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pub fn select_prev_sibling(syntax: &Syntax, text: RopeSlice, selection: Selection) -> Selection {
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select_node_impl(syntax, text, selection, |cursor| {
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while !cursor.goto_prev_sibling() {
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if !cursor.goto_parent() {
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break;
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}
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}
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})
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}
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fn select_node_impl<F>(
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syntax: &Syntax,
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text: RopeSlice,
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selection: Selection,
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motion: F,
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) -> Selection
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where
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F: Fn(&mut TreeCursor),
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{
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let cursor = &mut syntax.walk();
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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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cursor.reset_to_byte_range(from, to);
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motion(cursor);
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let node = cursor.node();
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let from = text.byte_to_char(node.start_byte());
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let to = text.byte_to_char(node.end_byte());
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Range::new(from, to).with_direction(range.direction())
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})
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}
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