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use ra_syntax::{
algo::non_trivia_sibling,
ast::{self, LoopBodyOwner},
match_ast, AstNode, Direction, NodeOrToken, SyntaxElement,
SyntaxKind::*,
SyntaxNode, SyntaxToken,
};
pub(crate) fn inside_impl(element: SyntaxElement) -> bool {
element.ancestors().find(|it| it.kind() == IMPL_DEF).is_some()
}
pub(crate) fn inside_trait(element: SyntaxElement) -> bool {
element.ancestors().find(|it| it.kind() == TRAIT_DEF).is_some()
}
pub(crate) fn has_bind_pat_parent(element: SyntaxElement) -> bool {
element.ancestors().find(|it| it.kind() == BIND_PAT).is_some()
}
pub(crate) fn has_ref_pat_parent(element: SyntaxElement) -> bool {
element.ancestors().find(|it| it.kind() == REF_PAT).is_some()
}
pub(crate) fn goes_after_unsafe(element: SyntaxElement) -> bool {
element
.into_token()
.and_then(|it| previous_non_trivia_token(it))
.filter(|it| it.kind() == UNSAFE_KW)
.is_some()
}
pub(crate) fn has_block_expr_parent(element: SyntaxElement) -> bool {
not_same_range_ancestor(element).filter(|it| it.kind() == BLOCK_EXPR).is_some()
}
pub(crate) fn has_item_list_parent(element: SyntaxElement) -> bool {
not_same_range_ancestor(element).filter(|it| it.kind() == ITEM_LIST).is_some()
}
pub(crate) fn has_trait_as_prev_sibling(element: SyntaxElement) -> bool {
previous_sibling_or_ancestor_sibling(element).filter(|it| it.kind() == TRAIT_DEF).is_some()
}
pub(crate) fn has_impl_as_prev_sibling(element: SyntaxElement) -> bool {
previous_sibling_or_ancestor_sibling(element).filter(|it| it.kind() == IMPL_DEF).is_some()
}
pub(crate) fn is_in_loop_body(element: SyntaxElement) -> bool {
let leaf = match element {
NodeOrToken::Node(node) => node,
NodeOrToken::Token(token) => token.parent(),
};
for node in leaf.ancestors() {
if node.kind() == FN_DEF || node.kind() == LAMBDA_EXPR {
break;
}
let loop_body = match_ast! {
match node {
ast::ForExpr(it) => it.loop_body(),
ast::WhileExpr(it) => it.loop_body(),
ast::LoopExpr(it) => it.loop_body(),
_ => None,
}
};
if let Some(body) = loop_body {
if body.syntax().text_range().contains_range(leaf.text_range()) {
return true;
}
}
}
false
}
fn not_same_range_ancestor(element: SyntaxElement) -> Option<SyntaxNode> {
element
.ancestors()
.take_while(|it| it.text_range() == element.text_range())
.last()
.and_then(|it| it.parent())
}
fn previous_non_trivia_token(token: SyntaxToken) -> Option<SyntaxToken> {
let mut token = token.prev_token();
while let Some(inner) = token.clone() {
if !inner.kind().is_trivia() {
return Some(inner);
} else {
token = inner.prev_token();
}
}
None
}
fn previous_sibling_or_ancestor_sibling(element: SyntaxElement) -> Option<SyntaxElement> {
let token_sibling = non_trivia_sibling(element.clone(), Direction::Prev);
if let Some(sibling) = token_sibling {
Some(sibling)
} else {
// if not trying to find first ancestor which has such a sibling
let node = match element {
NodeOrToken::Node(node) => node,
NodeOrToken::Token(token) => token.parent(),
};
let range = node.text_range();
let top_node = node.ancestors().take_while(|it| it.text_range() == range).last()?;
let prev_sibling_node = top_node.ancestors().find(|it| {
non_trivia_sibling(NodeOrToken::Node(it.to_owned()), Direction::Prev).is_some()
})?;
non_trivia_sibling(NodeOrToken::Node(prev_sibling_node), Direction::Prev)
}
}
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