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internal: Remove mutable syntax tree usages from add_missing_match_arms assist

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This commit is contained in:
Shoyu Vanilla 2025-02-14 02:36:05 +09:00
parent 51389bd00d
commit 8b947d7a12
3 changed files with 66 additions and 113 deletions
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46
crates/syntax/src/ast/edit_in_place.rs
View file

@ -710,52 +710,6 @@ impl ast::Fn {
}
}
impl Removable for ast::MatchArm {
fn remove(&self) {
if let Some(sibling) = self.syntax().prev_sibling_or_token() {
if sibling.kind() == SyntaxKind::WHITESPACE {
ted::remove(sibling);
}
}
if let Some(sibling) = self.syntax().next_sibling_or_token() {
if sibling.kind() == T![,] {
ted::remove(sibling);
}
}
ted::remove(self.syntax());
}
}
impl ast::MatchArmList {
pub fn add_arm(&self, arm: ast::MatchArm) {
normalize_ws_between_braces(self.syntax());
let mut elements = Vec::new();
let position = match self.arms().last() {
Some(last_arm) => {
if needs_comma(&last_arm) {
ted::append_child(last_arm.syntax(), make::token(SyntaxKind::COMMA));
}
Position::after(last_arm.syntax().clone())
}
None => match self.l_curly_token() {
Some(it) => Position::after(it),
None => Position::last_child_of(self.syntax()),
},
};
let indent = IndentLevel::from_node(self.syntax()) + 1;
elements.push(make::tokens::whitespace(&format!("\n{indent}")).into());
elements.push(arm.syntax().clone().into());
if needs_comma(&arm) {
ted::append_child(arm.syntax(), make::token(SyntaxKind::COMMA));
}
ted::insert_all(position, elements);
fn needs_comma(arm: &ast::MatchArm) -> bool {
arm.expr().is_some_and(|e| !e.is_block_like()) && arm.comma_token().is_none()
}
}
}
impl ast::LetStmt {
pub fn set_ty(&self, ty: Option<ast::Type>) {
match ty {

3
crates/syntax/src/ast/make.rs
View file

@ -837,7 +837,8 @@ pub fn match_guard(condition: ast::Expr) -> ast::MatchGuard {
pub fn match_arm_list(arms: impl IntoIterator<Item = ast::MatchArm>) -> ast::MatchArmList {
let arms_str = arms.into_iter().fold(String::new(), |mut acc, arm| {
let needs_comma = arm.expr().is_none_or(|it| !it.is_block_like());
let needs_comma =
arm.comma_token().is_none() && arm.expr().is_none_or(|it| !it.is_block_like());
let comma = if needs_comma { "," } else { "" };
let arm = arm.syntax();
format_to_acc!(acc, " {arm}{comma}\n")