JSON2 library was updated to version of October 30, 2022

Author: Taritsyn

src/MsieJavaScriptEngine/MsieJavaScriptEngine.csproj

@@ -25,7 +25,8 @@
     <IncludeSymbols>true</IncludeSymbols>
     <SymbolPackageFormat>snupkg</SymbolPackageFormat>
     <PackageTags>JavaScript;ECMAScript;MSIE;IE;Edge;Chakra</PackageTags>
-    <PackageReleaseNotes>In JsRT modes, `JsVariantToValue` and `JsValueToVariant` native methods are no longer used for embedding objects and types.</PackageReleaseNotes>
+    <PackageReleaseNotes>1. In JsRT modes, `JsVariantToValue` and `JsValueToVariant` native methods are no longer used for embedding objects and types;
+2. JSON2 library was updated to version of October 30, 2022.</PackageReleaseNotes>
     <NeutralLanguage>en-US</NeutralLanguage>
     <PackageOutputPath>../../nuget</PackageOutputPath>
     <GeneratePackageOnBuild Condition=" '$(Configuration)' == 'Release' ">true</GeneratePackageOnBuild>

src/MsieJavaScriptEngine/Resources/json2.js

@@ -1,5 +1,5 @@
 //  json2.js
-//  2017-06-12
+//  2022-10-30
 //  Public Domain.
 //  NO WARRANTY EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.
 
@@ -231,6 +231,29 @@ if (typeof JSON !== "object") {
     }
 
 
+// This variable is initialized with an empty array every time
+// JSON.stringify() is invoked and checked by the str() function. It's
+// used to keep references to object structures and capture cyclic
+// objects. Every new object is checked for its existence in this
+// array. If it's found it means the JSON object is cyclic and we have
+// to stop execution and throw a TypeError accordingly the ECMA262
+// (see NOTE 1 by the link https://tc39.es/ecma262/#sec-json.stringify).
+
+    var seen;
+
+// Emulate [].includes(). It's actual for old-fashioned JScript.
+
+    function includes(array, value) {
+        var i;
+        for (i = 0; i < array.length; i += 1) {
+            if (value === array[i]) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+
     function str(key, holder) {
 
 // Produce a string from holder[key].
@@ -295,6 +318,16 @@ if (typeof JSON !== "object") {
                 return "null";
             }
 
+// Check the value is not circular object. Otherwise throw TypeError.
+
+            if (includes(seen, value)) {
+                throw new TypeError("Converting circular structure to JSON");
+            }
+
+// Keep the value for the further check on circular references.
+
+            seen.push(value);
+
 // Make an array to hold the partial results of stringifying this object value.
 
             gap += indent;
@@ -428,6 +461,10 @@ if (typeof JSON !== "object") {
                 throw new Error("JSON.stringify");
             }
 
+// Initialize the reference keeper.
+
+            seen = [];
+
 // Make a fake root object containing our value under the key of "".
 // Return the result of stringifying the value.
 

src/MsieJavaScriptEngine/readme.txt

@@ -21,8 +21,9 @@
    =============
    RELEASE NOTES
    =============
-   In JsRT modes, `JsVariantToValue` and `JsValueToVariant` native methods are no
-   longer used for embedding objects and types.
+   1. In JsRT modes, `JsVariantToValue` and `JsValueToVariant` native methods are
+      no longer used for embedding objects and types;
+   2. JSON2 library was updated to version of October 30, 2022.
 
    ============
    PROJECT SITE