From 2141439c9c65ad3e2881fb9933f932b12868458a Mon Sep 17 00:00:00 2001
From: Guillaume Leclerc <guillaume.leclerc@epfl.ch>
Date: Wed, 5 Oct 2016 16:22:36 +0200
Subject: [PATCH] Support NewExpression

- One test added
- Supports constructor arguments (any number)
- resolves #14
---
 index.js     | 13 +++++++++++++
 test/eval.js | 12 ++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/index.js b/index.js
index fef382d..8585fd0 100644
--- a/index.js
+++ b/index.js
@@ -136,6 +136,19 @@ module.exports = function (ast, vars) {
         else if (node.type === 'TemplateElement') {
             return node.value.cooked;
         }
+        else if (node.type === 'NewExpression') {
+            var callee = walk(node.callee);
+            if (callee === FAIL) return FAIL;
+            if (typeof callee !== 'function') return FAIL;
+
+            var args = [];
+            for (var i = 0, l = node.arguments.length; i < l; i++) {
+                var x = walk(node.arguments[i]);
+                if (x === FAIL) return FAIL;
+                args.push(x);
+            }
+            return new callee(...args);
+        }
         else return FAIL;
     })(ast);
     
diff --git a/test/eval.js b/test/eval.js
index 443b532..611aa95 100644
--- a/test/eval.js
+++ b/test/eval.js
@@ -62,3 +62,15 @@ test('evaluate this', function(t) {
     });
     t.equal(res, 101);
 });
+
+test('evaluate new', function(t) {
+    t.plan(1);
+
+    var src = '(new Array(1, v))[1]';
+    var ast = parse(src).body[0].expression;
+    var res = evaluate(ast, {
+      Array: Array,
+      v: 100
+    });
+    t.equal(res, 100);
+});