diff --git a/src/ast-builder.js b/src/ast-builder.js
index d65dd98..a09d48a 100644
--- a/src/ast-builder.js
+++ b/src/ast-builder.js
@@ -9,12 +9,13 @@ function buildBinaryExpression(ctx, visitor) {
         // Collect all possible operator tokens from the context.
         const operators = [];
         if (ctx.EqEq) operators.push(...ctx.EqEq);
+        if (ctx.Gt) operators.push(...ctx.Gt);
+        if (ctx.Lt) operators.push(...ctx.Lt);
         if (ctx.Plus) operators.push(...ctx.Plus);
         if (ctx.Minus) operators.push(...ctx.Minus);
         if (ctx.Star) operators.push(...ctx.Star);
         if (ctx.Slash) operators.push(...ctx.Slash);
-        
-        // Sort operators by their position in the source text to handle mixed operators correctly.
+
         operators.sort((a, b) => a.startOffset - b.startOffset);
 
         ctx.right.forEach((rhs, i) => {
@@ -30,22 +31,57 @@ function buildBinaryExpression(ctx, visitor) {
     return left;
 }
 
+// Build member chain using token ordering to preserve dots/brackets sequence.
+function buildMemberChain(ctx, base, visitor, idStartIndex = 0) {
+    let obj = base;
+
+    const steps = [];
+    if (ctx.Dot) steps.push(...ctx.Dot.map(tok => ({ kind: 'dot', tok })));
+    if (ctx.LBracket) steps.push(...ctx.LBracket.map(tok => ({ kind: 'brack', tok })));
+    steps.sort((a, b) => a.tok.startOffset - b.tok.startOffset);
+
+    let idIdx = idStartIndex;
+    let exprIdx = 0;
+
+    steps.forEach(step => {
+        if (step.kind === 'dot') {
+            const propTok = ctx.Identifier[idIdx++];
+            obj = {
+                type: 'MemberExpression',
+                computed: false,
+                object: obj,
+                property: { type: 'Identifier', name: propTok.image }
+            };
+        } else {
+            const propExpr = visitor.visit(ctx.expression[exprIdx++]);
+            obj = {
+                type: 'MemberExpression',
+                computed: true,
+                object: obj,
+                property: propExpr
+            };
+        }
+    });
+
+    return obj;
+}
+
 class AstBuilder extends BaseHiVisitor {
     constructor() {
         super();
         this.validateVisitor();
     }
-    
+
     program(ctx) { return { type: 'Program', body: this.visit(ctx.statements) }; }
     statements(ctx) { return ctx.statement?.map(stmt => this.visit(stmt)) || []; }
-    
+
     statement(ctx) {
         if (ctx.declaration) return this.visit(ctx.declaration);
         if (ctx.assignment) return this.visit(ctx.assignment);
         if (ctx.returnStatement) return this.visit(ctx.returnStatement);
         if (ctx.expressionStatement) return this.visit(ctx.expressionStatement);
     }
-    
+
     returnStatement(ctx) {
         return { type: 'ReturnStatement', argument: ctx.expression ? this.visit(ctx.expression) : null };
     }
@@ -60,14 +96,23 @@ class AstBuilder extends BaseHiVisitor {
         };
     }
 
+    // assignment: assignable '=' expression
     assignment(ctx) {
         return {
             type: 'AssignmentExpression',
-            left: { type: 'Identifier', name: ctx.Identifier[0].image },
+            left: this.visit(ctx.left),
             right: this.visit(ctx.expression),
         };
     }
-    
+
+    // assignable: Identifier (.Identifier | [expr])*
+    assignable(ctx) {
+        const base = { type: 'Identifier', name: ctx.Identifier[0].image };
+        // ctx.Identifier contains base + dot-props
+        if (!ctx.Dot && !ctx.LBracket) return base;
+        return buildMemberChain(ctx, base, this, 1);
+    }
+
     expression(ctx) { return this.visit(ctx.conditionalExpression); }
 
     conditionalExpression(ctx) {
@@ -79,8 +124,9 @@ class AstBuilder extends BaseHiVisitor {
             alternate: ctx.alternate ? this.visit(ctx.alternate) : { type: 'NullLiteral' },
         };
     }
-    
+
     equalityExpression(ctx) { return buildBinaryExpression(ctx, this); }
+    relationalExpression(ctx) { return buildBinaryExpression(ctx, this); }
     additiveExpression(ctx) { return buildBinaryExpression(ctx, this); }
     multiplicativeExpression(ctx) { return buildBinaryExpression(ctx, this); }
 
@@ -99,60 +145,82 @@ class AstBuilder extends BaseHiVisitor {
     }
 
     argumentList(ctx) { return ctx.expression.map(expr => this.visit(expr)); }
-    
+
     memberExpression(ctx) {
-        let obj = this.visit(ctx.object);
-        ctx.Identifier?.forEach(prop => {
-            obj = { type: 'MemberExpression', computed: false, object: obj, property: { type: 'Identifier', name: prop.image } };
-        });
-        ctx.expression?.forEach(prop => {
-            obj = { type: 'MemberExpression', computed: true, object: obj, property: this.visit(prop) };
-        });
-        return obj;
+        const base = this.visit(ctx.object);
+        if (!ctx.Dot && !ctx.LBracket) return base;
+
+        // ctx.Identifier are only the dot properties (no base here)
+        return buildMemberChain(ctx, base, this, 0);
     }
 
     primary(ctx) {
         if (ctx.literal) return this.visit(ctx.literal);
         if (ctx.Identifier) return { type: 'Identifier', name: ctx.Identifier[0].image };
         if (ctx.At) return { type: 'ThisExpression' };
-        if (ctx.block) return this.visit(ctx.block);
         if (ctx.arrowExpression) return this.visit(ctx.arrowExpression);
+        if (ctx.functionExpression) return this.visit(ctx.functionExpression);
+        if (ctx.objectLiteral) return this.visit(ctx.objectLiteral);
+        if (ctx.codeBlock) return this.visit(ctx.codeBlock);
         if (ctx.arrayLiteral) return this.visit(ctx.arrayLiteral);
-        if (ctx.expression) return this.visit(ctx.expression);
+        if (ctx.parenthesizedExpression) return this.visit(ctx.parenthesizedExpression);
     }
-    
+
     literal(ctx) {
         if (ctx.Number) {
             const image = ctx.Number[0].image;
             if (image === '!0') return { type: 'BooleanLiteral', value: true };
             return { type: 'NumericLiteral', value: Number(image) };
         }
-        if (ctx.String) return { type: 'StringLiteral', value: ctx.String[0].image.slice(1,-1) };
+        if (ctx.String) return { type: 'StringLiteral', value: ctx.String[0].image.slice(1, -1) };
         if (ctx.Null) return { type: 'NullLiteral' };
     }
 
-    block(ctx) {
-        const params = ctx.parameterList ? this.visit(ctx.parameterList) : [];
+    // codeBlock -> Block node (for implicit return/IIFE in conditionals)
+    codeBlock(ctx) {
         const body = this.visit(ctx.statements);
-        if (ctx.parameterList) { // If there's a param list, it's a function
-            return { type: 'FunctionExpression', params, body: { type: 'BlockStatement', body } };
-        }
         return { type: 'Block', body };
     }
 
+    // functionExpression -> FunctionExpression node
+    functionExpression(ctx) {
+        const params = this.visit(ctx.parameterList);
+        const body = this.visit(ctx.codeBlock);
+        return { type: 'FunctionExpression', params, body: { type: 'BlockStatement', body: body.body } };
+    }
+
+    // arrowExpression(params => body)
     arrowExpression(ctx) {
         const params = this.visit(ctx.parameterList);
-        const body = ctx.block ? this.visit(ctx.block) : this.visit(ctx.expression);
+        const body = ctx.codeBlock ? this.visit(ctx.codeBlock) : this.visit(ctx.expression);
         return { type: 'ArrowFunctionExpression', params, body };
     }
-    
+
+    // parenthesizedExpression simply returns the inner expression
+    parenthesizedExpression(ctx) { return this.visit(ctx.expression); }
+
     parameterList(ctx) {
         return ctx.Identifier?.map(id => ({ type: 'Identifier', name: id.image })) || [];
     }
-    
+
     arrayLiteral(ctx) {
         return { type: 'ArrayLiteral', elements: ctx.expression?.map(e => this.visit(e)) || [] };
     }
+
+    objectLiteral(ctx) {
+        const props = [];
+        const ids = ctx.Identifier || [];
+        const exprs = ctx.expression || [];
+        for (let i = 0; i < ids.length; i++) {
+            props.push({
+                type: 'Property',
+                key: ids[i].image,
+                value: this.visit(exprs[i])
+            });
+        }
+        return { type: 'ObjectLiteral', properties: props };
+    }
 }
 
 export const astBuilder = new AstBuilder();
+