Add elvis operator for indexing.

2022-06-12 00:32:12 +08:00
parent b9cbeb65d6
commit 2b44778a5c
7 changed files with 88 additions and 16 deletions
--- a/src/ast/expr.rs
+++ b/src/ast/expr.rs
@@ -411,6 +411,7 @@ pub enum Expr {
    ///
    /// ### Flags
    ///
+    /// [`NEGATED`][ASTFlags::NEGATED] = `?[` ... `]` (`[` ... `]` if unset)
    /// [`BREAK`][ASTFlags::BREAK] = terminate the chain (recurse into the chain if unset)
    Index(Box<BinaryExpr>, ASTFlags, Position),
    /// lhs `&&` rhs
@@ -827,7 +828,7 @@ impl Expr {
            #[cfg(not(feature = "no_object"))]
            Token::Period | Token::Elvis => return true,
            #[cfg(not(feature = "no_index"))]
-            Token::LeftBracket => return true,
+            Token::LeftBracket | Token::QuestionBracket => return true,
            _ => (),
        }