Unnamed repository; edit this file 'description' to name the repository.
Diffstat (limited to 'crates/syntax/src/algo.rs')
| -rw-r--r-- | crates/syntax/src/algo.rs | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/crates/syntax/src/algo.rs b/crates/syntax/src/algo.rs index b618943dba..3ab9c90262 100644 --- a/crates/syntax/src/algo.rs +++ b/crates/syntax/src/algo.rs @@ -116,3 +116,19 @@ pub fn neighbor<T: AstNode>(me: &T, direction: Direction) -> Option<T> { pub fn has_errors(node: &SyntaxNode) -> bool { node.children().any(|it| it.kind() == SyntaxKind::ERROR) } + +pub fn previous_non_trivia_token(e: impl Into<SyntaxElement>) -> Option<SyntaxToken> { + let mut token = match e.into() { + SyntaxElement::Node(n) => n.first_token()?, + SyntaxElement::Token(t) => t, + } + .prev_token(); + while let Some(inner) = token { + if !inner.kind().is_trivia() { + return Some(inner); + } else { + token = inner.prev_token(); + } + } + None +} |