From d45c283f3b8e7377a585670f4036572f90e39845 Mon Sep 17 00:00:00 2001
From: Kalila L <kasenvr@gmail.com>
Date: Thu, 27 Aug 2020 03:53:04 -0400
Subject: [PATCH] Add semanticVersionCompare function to utils.js

---
 scripts/system/libraries/utils.js | 55 +++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/scripts/system/libraries/utils.js b/scripts/system/libraries/utils.js
index d5155ff465..ff467b1f5b 100644
--- a/scripts/system/libraries/utils.js
+++ b/scripts/system/libraries/utils.js
@@ -502,3 +502,58 @@ getMainTabletIDs = function () {
     }
     return tabletIDs;
 };
+
+// returns 1 if A is greater, 0 if equal, -1 if A is lesser
+semanticVersionCompare = function(versionA, versionB) {
+    var versionAParts = versionA.split('.');
+    var versionBParts = versionB.split('.');
+
+    // make sure each version has 3 parts
+    var partsLength = versionAParts.length;
+    while (partsLength < 3) {
+        partsLength = versionAParts.push(0);
+    }
+
+    partsLength = versionBParts.length;
+    while (partsLength < 3) {
+        partsLength = versionBParts.push(0);
+    }
+
+    for (var i = 0; i < 3; ++i) {
+        // We're detecting if there's tags, indicating a pre-release OR it's obsolete.
+        var versionAPartHasTag = (versionAParts[i].indexOf('-') !== -1);
+        var versionBPartHasTag = (versionBParts[i].indexOf('-') !== -1);
+
+        if (versionAPartHasTag || versionBPartHasTag) {
+            // In semantic versioning, if version A has a tag and B does not, B is a higher version.
+            if (versionAPartHasTag < versionBPartHasTag) {
+                return 1;
+            } else if (versionAPartHasTag > versionBPartHasTag) {
+                return -1;
+            } else {
+                // They both have tags
+                var splitA = versionAParts[i].split('-')[0];
+                var splitB = versionBParts[i].split('-')[0];
+                
+                if (splitA == splitB) {
+                    continue;
+                } else if (splitA > splitB) {
+                    return 1;
+                } else {
+                    return -1;
+                }
+            }
+        } else { // Else, they're both numbers so compare the strings as if they were.
+            if (versionAParts[i] == versionBParts[i]) {
+                continue;
+            } else if (versionAParts[i] > versionBParts[i]) {
+                return 1;
+            } else {
+                return -1;
+            }
+        }
+    }
+    
+    // They're both equal!
+    return 0;
+}