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Don't offer extract_variable assist when there is no surrounding block

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This commit is contained in:
Lukas Wirth 2021-07-21 17:52:17 +02:00
parent 33972da625
commit 9279c1c939
1 changed files with 45 additions and 30 deletions
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75
crates/ide_assists/src/handlers/extract_variable.rs
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@ -35,7 +35,10 @@ pub(crate) fn extract_variable(acc: &mut Assists, ctx: &AssistContext) -> Option
cov_mark::hit!(extract_var_in_comment_is_not_applicable);
return None;
}
let to_extract = node.ancestors().find_map(valid_target_expr)?;
let to_extract = node
.ancestors()
.take_while(|it| it.text_range().contains_range(ctx.frange.range))
.find_map(valid_target_expr)?;
if let Some(ty) = ctx.sema.type_of_expr(&to_extract) {
if ty.is_unit() {
return None;
@ -142,41 +145,43 @@ enum Anchor {
impl Anchor {
fn from(to_extract: &ast::Expr) -> Option<Anchor> {
to_extract.syntax().ancestors().find_map(|node| {
if let Some(expr) =
node.parent().and_then(ast::BlockExpr::cast).and_then(|it| it.tail_expr())
{
if expr.syntax() == &node {
cov_mark::hit!(test_extract_var_last_expr);
return Some(Anchor::Before(node));
to_extract.syntax().ancestors().take_while(|it| !ast::Item::can_cast(it.kind())).find_map(
|node| {
if let Some(expr) =
node.parent().and_then(ast::BlockExpr::cast).and_then(|it| it.tail_expr())
{
if expr.syntax() == &node {
cov_mark::hit!(test_extract_var_last_expr);
return Some(Anchor::Before(node));
}
}
}
if let Some(parent) = node.parent() {
if parent.kind() == CLOSURE_EXPR {
cov_mark::hit!(test_extract_var_in_closure_no_block);
return Some(Anchor::WrapInBlock(node));
}
if parent.kind() == MATCH_ARM {
if node.kind() == MATCH_GUARD {
cov_mark::hit!(test_extract_var_in_match_guard);
} else {
cov_mark::hit!(test_extract_var_in_match_arm_no_block);
if let Some(parent) = node.parent() {
if parent.kind() == CLOSURE_EXPR {
cov_mark::hit!(test_extract_var_in_closure_no_block);
return Some(Anchor::WrapInBlock(node));
}
}
}
if let Some(stmt) = ast::Stmt::cast(node.clone()) {
if let ast::Stmt::ExprStmt(stmt) = stmt {
if stmt.expr().as_ref() == Some(to_extract) {
return Some(Anchor::Replace(stmt));
if parent.kind() == MATCH_ARM {
if node.kind() == MATCH_GUARD {
cov_mark::hit!(test_extract_var_in_match_guard);
} else {
cov_mark::hit!(test_extract_var_in_match_arm_no_block);
return Some(Anchor::WrapInBlock(node));
}
}
}
return Some(Anchor::Before(node));
}
None
})
if let Some(stmt) = ast::Stmt::cast(node.clone()) {
if let ast::Stmt::ExprStmt(stmt) = stmt {
if stmt.expr().as_ref() == Some(to_extract) {
return Some(Anchor::Replace(stmt));
}
}
return Some(Anchor::Before(node));
}
None
},
)
}
fn syntax(&self) -> &SyntaxNode {
@ -844,4 +849,14 @@ fn main() {
"2 + 2",
);
}
#[test]
fn extract_var_no_block_body() {
check_assist_not_applicable(
extract_variable,
r"
const X: usize = $0100$0;
",
);
}
}