wip -- start indexing work

rust_compiler/libs/parser/src/lib.rs

@@ -308,7 +308,7 @@ impl<'a> Parser<'a> {
         Ok(Some(lhs))
     }
 
-    /// Handles dot notation chains: x.y.z()
+    /// Handles dot notation chains (x.y.z()) and array indexing (x[0])
     fn parse_postfix(
         &mut self,
         mut lhs: Spanned<Expression<'a>>,
@@ -411,6 +411,9 @@ impl<'a> Parser<'a> {
                         }),
                     };
                 }
+            } else if self_matches_peek!(self, TokenType::Symbol(Symbol::LBracket)) {
+                // consume the `[` token
+                self.assign_next()?;
             } else {
                 break;
             }

rust_compiler/libs/parser/src/tree_node.rs

@@ -174,6 +174,18 @@ impl<'a> std::fmt::Display for MemberAccessExpression<'a> {
     }
 }
 
+#[derive(Debug, PartialEq, Eq)]
+pub struct MemberIndexingExpression<'a> {
+    pub object: LiteralOrVariable<'a>,
+    pub index_of: Box<Spanned<Expression<'a>>>,
+}
+
+impl<'a> std::fmt::Display for MemberIndexingExpression<'a> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}[{}]", self.object, self.index_of)
+    }
+}
+
 #[derive(Debug, PartialEq, Eq)]
 pub struct MethodCallExpression<'a> {
     pub object: Box<Spanned<Expression<'a>>>,