From 53926d7fbf4232cdef0449b5b515404085fea3f1 Mon Sep 17 00:00:00 2001
From: FranklinDM <mrmineshafter17@gmail.com>
Date: Fri, 27 May 2022 16:21:50 -0500
Subject: [JS:Engine] Implement support for nullish coalescing in the JS parser

- UXP Parts 1, 2, 4, 5, and 7 based on Bug 1566141
- UXP Part 3 partially based on Bugs 1566141 and 1593415
- UXP Part 6 partly based on Bugs 1566141 and 1599163 with a different approach by modifying the `Boolish` function directly to act differently if we're checking for nullish values.
---
 .../coalesce/chainable-with-bitwise-or.js          | 51 ++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 js/src/tests/test262/language/expressions/coalesce/chainable-with-bitwise-or.js

(limited to 'js/src/tests/test262/language/expressions/coalesce/chainable-with-bitwise-or.js')

diff --git a/js/src/tests/test262/language/expressions/coalesce/chainable-with-bitwise-or.js b/js/src/tests/test262/language/expressions/coalesce/chainable-with-bitwise-or.js
new file mode 100644
index 000000000..214d4fd9a
--- /dev/null
+++ b/js/src/tests/test262/language/expressions/coalesce/chainable-with-bitwise-or.js
@@ -0,0 +1,51 @@
+// Copyright (C) 2019 Leo Balter. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+
+/*---
+description: >
+    CoalesceExpression is chainable with the BitwiseORExpression
+esid: sec-conditional-operator
+info: |
+    ConditionalExpression :
+        ShortCircuitExpression
+        ShortCircuitExpression ? AssignmentExpression : AssignmentExpression
+
+    ShortCircuitExpression :
+        LogicalORExpression
+        CoalesceExpression
+
+    CoalesceExpression :
+        CoalesceExpressionHead ?? BitwiseORExpression
+
+    CoalesceExpressionHead :
+        CoalesceExpression
+        BitwiseORExpression
+
+    Runtime Semantics: Evaluation
+
+    CoalesceExpression:CoalesceExpressionHead??BitwiseORExpression
+
+    1. Let lref be the result of evaluating CoalesceExpressionHead.
+    2. Let lval be ? GetValue(lref).
+    3. If lval is undefined or null,
+        a. Let rref be the result of evaluating BitwiseORExpression.
+        b. Return ? GetValue(rref).
+    4. Otherwise, return lval.
+features: [coalesce-expression]
+---*/
+
+var x;
+
+x = null ?? 1 | 42;
+assert.sameValue(x, 43, 'null ?? 1 | 42');
+
+x = undefined ?? 1 | 42;
+assert.sameValue(x, 43, 'null ?? 1 | 42');
+
+x = false ?? 1 | 42;
+assert.sameValue(x, false, 'false ?? 1 | 42');
+
+x = true ?? 1 | 42;
+assert.sameValue(x, true, 'true ?? 1 | 42');
+
+reportCompare(0, 0);
-- 
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