74 lines
2.4 KiB
Rust
74 lines
2.4 KiB
Rust
use syntax::{
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ast::{self, AstNode},
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SourceFile, SyntaxKind, TextSize, T,
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};
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use test_utils::mark;
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// Feature: Matching Brace
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//
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// If the cursor is on any brace (`<>(){}[]||`) which is a part of a brace-pair,
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// moves cursor to the matching brace. It uses the actual parser to determine
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// braces, so it won't confuse generics with comparisons.
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//
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// |===
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// | Editor | Action Name
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//
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// | VS Code | **Rust Analyzer: Find matching brace**
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// |===
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pub fn matching_brace(file: &SourceFile, offset: TextSize) -> Option<TextSize> {
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const BRACES: &[SyntaxKind] =
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&[T!['{'], T!['}'], T!['['], T![']'], T!['('], T![')'], T![<], T![>], T![|], T![|]];
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let (brace_token, brace_idx) = file
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.syntax()
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.token_at_offset(offset)
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.filter_map(|node| {
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let idx = BRACES.iter().position(|&brace| brace == node.kind())?;
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Some((node, idx))
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})
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.next()?;
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let parent = brace_token.parent();
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if brace_token.kind() == T![|] && !ast::ParamList::can_cast(parent.kind()) {
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mark::hit!(pipes_not_braces);
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return None;
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}
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let matching_kind = BRACES[brace_idx ^ 1];
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let matching_node = parent
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.children_with_tokens()
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.filter_map(|it| it.into_token())
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.find(|node| node.kind() == matching_kind && node != &brace_token)?;
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Some(matching_node.text_range().start())
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}
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#[cfg(test)]
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mod tests {
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use test_utils::{add_cursor, assert_eq_text, extract_offset};
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use super::*;
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#[test]
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fn test_matching_brace() {
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fn do_check(before: &str, after: &str) {
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let (pos, before) = extract_offset(before);
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let parse = SourceFile::parse(&before);
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let new_pos = match matching_brace(&parse.tree(), pos) {
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None => pos,
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Some(pos) => pos,
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};
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let actual = add_cursor(&before, new_pos);
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assert_eq_text!(after, &actual);
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}
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do_check("struct Foo { a: i32, }<|>", "struct Foo <|>{ a: i32, }");
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do_check("fn main() { |x: i32|<|> x * 2;}", "fn main() { <|>|x: i32| x * 2;}");
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do_check("fn main() { <|>|x: i32| x * 2;}", "fn main() { |x: i32<|>| x * 2;}");
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{
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mark::check!(pipes_not_braces);
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do_check(
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"fn main() { match 92 { 1 | 2 |<|> 3 => 92 } }",
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"fn main() { match 92 { 1 | 2 |<|> 3 => 92 } }",
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);
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}
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}
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}
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