From c680a19833efb406f7da1d1f6569b6e94be9e062 Mon Sep 17 00:00:00 2001
From: Jamorham <jamorham@users.noreply.github.com>
Date: Wed, 23 Aug 2023 09:39:03 +0000
Subject: [PATCH] UIBased: filter improvements

---
 .../dexdrip/services/UiBasedCollector.java    | 46 ++++++++++++++-----
 1 file changed, 35 insertions(+), 11 deletions(-)

diff --git a/app/src/main/java/com/eveningoutpost/dexdrip/services/UiBasedCollector.java b/app/src/main/java/com/eveningoutpost/dexdrip/services/UiBasedCollector.java
index 618701e0fc..b4daea6cf5 100644
--- a/app/src/main/java/com/eveningoutpost/dexdrip/services/UiBasedCollector.java
+++ b/app/src/main/java/com/eveningoutpost/dexdrip/services/UiBasedCollector.java
@@ -2,7 +2,6 @@
 
 import static com.eveningoutpost.dexdrip.models.JoH.msSince;
 import static com.eveningoutpost.dexdrip.cgm.dex.ClassifierAction.lastReadingTimestamp;
-import static com.eveningoutpost.dexdrip.utilitymodels.Constants.MINUTE_IN_MS;
 import static com.eveningoutpost.dexdrip.utils.DexCollectionType.UiBased;
 import static com.eveningoutpost.dexdrip.utils.DexCollectionType.getDexCollectionType;
 import static com.eveningoutpost.dexdrip.xdrip.gs;
@@ -210,20 +209,45 @@ String filterString(final String value) {
         if (lastPackage == null) return value;
         switch (lastPackage) {
             default:
-                return value
-                        .replace("\u00a0"," ")
-                        .replace("\u2060","")
-                        .replace("\\","/")
-                        .replace("mmol/L", "")
-                        .replace("mmol/l", "")
-                        .replace("mg/dL", "")
-                        .replace("mg/dl", "")
-                        .replace("≤", "")
-                        .replace("≥", "")
+                    return (basicFilterString(arrowFilterString(value)))
                         .trim();
         }
     }
 
+    String basicFilterString(final String value) {
+        return value
+                .replace("\u00a0"," ")
+                .replace("\u2060","")
+                .replace("\\","/")
+                .replace("mmol/L", "")
+                .replace("mmol/l", "")
+                .replace("mg/dL", "")
+                .replace("mg/dl", "")
+                .replace("≤", "")
+                .replace("≥", "");
+    }
+
+    String arrowFilterString(final String value) {
+        return filterUnicodeRange(filterUnicodeRange(filterUnicodeRange(filterUnicodeRange(value,
+                '\u2190', '\u21FF'),
+                '\u2700', '\u27BF'),
+                '\u2900', '\u297F'),
+                '\u2B00', '\u2BFF');
+    }
+
+    public String filterUnicodeRange(final String input, final char bottom, final char top) {
+        if (bottom > top) {
+            throw new RuntimeException("bottom and top of character range invalid");
+        }
+        val filtered = new StringBuilder(input.length());
+        for (final char c : input.toCharArray()) {
+            if (c < bottom || c > top) {
+                filtered.append(c);
+            }
+        }
+        return filtered.toString();
+    }
+
     @SuppressWarnings("UnnecessaryLocalVariable")
     private void processRemote(final RemoteViews cview) {
         if (cview == null) return;