Merge #3741

3741: More general ctor for ifs r=matklad a=matklad



bors r+
🤖

Co-authored-by: Aleksey Kladov <aleksey.kladov@gmail.com>

crates/ra_assists/src/handlers/early_return.rs

@@ -104,7 +104,7 @@ pub(crate) fn convert_to_guarded_return(ctx: AssistCtx) -> Option<Assist> {
                     let then_branch =
                         make::block_expr(once(make::expr_stmt(early_expression).into()), None);
                     let cond = invert_boolean_expression(cond_expr);
-                    let e = make::expr_if(cond, then_branch);
+                    let e = make::expr_if(make::condition(cond, None), then_branch);
                     if_indent_level.increase_indent(e)
                 };
                 replace(new_expr.syntax(), &then_block, &parent_block, &if_expr)

crates/ra_syntax/src/ast/make.rs

@@ -108,7 +108,7 @@ pub fn expr_return() -> ast::Expr {
 pub fn expr_match(expr: ast::Expr, match_arm_list: ast::MatchArmList) -> ast::Expr {
     expr_from_text(&format!("match {} {}", expr, match_arm_list))
 }
-pub fn expr_if(condition: ast::Expr, then_branch: ast::BlockExpr) -> ast::Expr {
+pub fn expr_if(condition: ast::Condition, then_branch: ast::BlockExpr) -> ast::Expr {
     expr_from_text(&format!("if {} {}", condition, then_branch))
 }
 pub fn expr_prefix(op: SyntaxKind, expr: ast::Expr) -> ast::Expr {
@@ -123,6 +123,15 @@ pub fn try_expr_from_text(text: &str) -> Option<ast::Expr> {
     try_ast_from_text(&format!("const C: () = {};", text))
 }
 
+pub fn condition(expr: ast::Expr, pattern: Option<ast::Pat>) -> ast::Condition {
+    match pattern {
+        None => ast_from_text(&format!("const _: () = while {} {{}};", expr)),
+        Some(pattern) => {
+            ast_from_text(&format!("const _: () = while {} = {} {{}};", pattern, expr))
+        }
+    }
+}
+
 pub fn bind_pat(name: ast::Name) -> ast::BindPat {
     return from_text(name.text());