From 6b3e3a0831099c84def024a5bfe6036c2c53b04a Mon Sep 17 00:00:00 2001
From: Christian Schneppe <christian@pix-art.de>
Date: Sat, 7 Apr 2018 22:55:03 +0200
Subject: use scripts instead of blocks on Android >= N

---
 .../utils/IrregularUnicodeBlockDetector.java       | 54 +++++++++++++++++++---
 1 file changed, 47 insertions(+), 7 deletions(-)

(limited to 'src/main/java')

diff --git a/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java b/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java
index df654eeb3..c1e4ba88b 100644
--- a/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java
+++ b/src/main/java/de/pixart/messenger/utils/IrregularUnicodeBlockDetector.java
@@ -29,7 +29,9 @@
 
 package de.pixart.messenger.utils;
 
+import android.annotation.TargetApi;
 import android.content.Context;
+import android.os.Build;
 import android.support.annotation.ColorInt;
 import android.text.Spannable;
 import android.text.SpannableString;
@@ -98,7 +100,7 @@ public class IrregularUnicodeBlockDetector {
         return builder;
     }
 
-    private static Map<Character.UnicodeBlock, List<String>> map(Jid jid) {
+    private static Map<Character.UnicodeBlock, List<String>> mapCompat(Jid jid) {
         Map<Character.UnicodeBlock, List<String>> map = new HashMap<>();
         String local = jid.getLocal();
         final int length = local.length();
@@ -118,16 +120,48 @@ public class IrregularUnicodeBlockDetector {
         return map;
     }
 
-    private static Set<String> eliminateFirstAndGetCodePoints(Map<Character.UnicodeBlock, List<String>> map) {
-        Character.UnicodeBlock block = Character.UnicodeBlock.BASIC_LATIN;
+    @TargetApi(Build.VERSION_CODES.N)
+    private static Map<Character.UnicodeScript, List<String>> map(Jid jid) {
+        Map<Character.UnicodeScript, List<String>> map = new HashMap<>();
+        String local = jid.getLocal();
+        final int length = local.length();
+        for (int offset = 0; offset < length; ) {
+            final int codePoint = local.codePointAt(offset);
+            Character.UnicodeScript script = Character.UnicodeScript.of(codePoint);
+            if (script != Character.UnicodeScript.COMMON) {
+                List<String> codePoints;
+                if (map.containsKey(script)) {
+                    codePoints = map.get(script);
+                } else {
+                    codePoints = new ArrayList<>();
+                    map.put(script, codePoints);
+                }
+                codePoints.add(String.copyValueOf(Character.toChars(codePoint)));
+            }
+            offset += Character.charCount(codePoint);
+        }
+        return map;
+    }
+
+    private static Set<String> eliminateFirstAndGetCodePointsCompat(Map<Character.UnicodeBlock, List<String>> map) {
+        return eliminateFirstAndGetCodePoints(map, Character.UnicodeBlock.BASIC_LATIN);
+    }
+
+    @TargetApi(Build.VERSION_CODES.N)
+    private static Set<String> eliminateFirstAndGetCodePoints(Map<Character.UnicodeScript, List<String>> map) {
+        return eliminateFirstAndGetCodePoints(map, Character.UnicodeScript.COMMON);
+    }
+
+    private static <T> Set<String> eliminateFirstAndGetCodePoints(Map<T, List<String>> map, T defaultPick) {
+        T pick = defaultPick;
         int size = 0;
-        for (Map.Entry<Character.UnicodeBlock, List<String>> entry : map.entrySet()) {
+        for (Map.Entry<T, List<String>> entry : map.entrySet()) {
             if (entry.getValue().size() > size) {
                 size = entry.getValue().size();
-                block = entry.getKey();
+                pick = entry.getKey();
             }
         }
-        map.remove(block);
+        map.remove(pick);
         Set<String> all = new HashSet<>();
         for (List<String> codePoints : map.values()) {
             all.addAll(codePoints);
@@ -141,7 +175,13 @@ public class IrregularUnicodeBlockDetector {
             if (pattern != null) {
                 return pattern;
             }
-            pattern = create(eliminateFirstAndGetCodePoints(map(jid)));
+            Set<String> codePoints;
+            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.N) {
+                codePoints = eliminateFirstAndGetCodePointsCompat(mapCompat(jid));
+            } else {
+                codePoints = eliminateFirstAndGetCodePoints(map(jid));
+            }
+            pattern = create(codePoints);
             CACHE.put(jid, pattern);
             return pattern;
         }
-- 
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