1 files changed, 48 insertions, 0 deletions
diff --git a/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/comments/util/CommentsUtil.java b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/comments/util/CommentsUtil.java
new file mode 100644
index 000000000..5251291c8
--- /dev/null
+++ b/app/src/main/java/it/niedermann/nextcloud/deck/ui/card/comments/util/CommentsUtil.java
@@ -0,0 +1,48 @@
+package it.niedermann.nextcloud.deck.ui.card.comments.util;
+
+
+import androidx.core.util.Pair;
+
+public class CommentsUtil {
+
+    public static Pair<String, Integer> getUserNameForMentionProposal(String text, int cursorPosition) {
+        Pair result = null;
+
+        if (text != null) {
+            // find start of relevant substring
+            int cursor = cursorPosition;
+            if (cursor < 1) {
+                return null;
+            }
+            int start = 0;
+            while (cursor > 0) {
+                cursor--;
+                if (Character.isWhitespace(text.charAt(cursor))) {
+                    start = cursor + 1;
+                    break;
+                }
+            }
+            if (text.length()-1 < start || text.charAt(start) != '@') {
+                return null;
+            }
+
+            // find end of relevant substring
+            cursor = cursorPosition;
+            int textLength = text.length();
+            int end = textLength;
+            while (cursor < textLength) {
+                if (Character.isWhitespace(text.charAt(cursor))) {
+                    end = cursor;
+                    break;
+                }
+                cursor++;
+            }
+
+            start++;
+            result = Pair.create(text.substring(start, end), start);
+
+        }
+
+        return result;
+    }
+}