feat: clean code

lib/src/main/java/io/github/jmecn/text/EmojiIterator.java

@@ -79,7 +79,7 @@ public int getTextEnd() {
     }
 
     public boolean next() {
-        if (this.end >= this.nChars - 1) {
+        if (this.end >= this.nChars) {
             return false;
         }
 

lib/src/main/java/io/github/jmecn/text/EmojiRun.java

@@ -0,0 +1,62 @@
+package io.github.jmecn.text;
+
+import java.util.Objects;
+
+/**
+ * desc:
+ *
+ * @author yanmaoyuan
+ */
+public class EmojiRun {
+
+    private final boolean isEmoji;
+    private final int unicodeStart;
+    private final int unicodeEnd;
+    private final int textStart;
+    private final int textEnd;
+
+    EmojiRun(boolean isEmoji, int unicodeStart, int unicodeEnd, int textStart, int textEnd) {
+        this.isEmoji = isEmoji;
+        this.unicodeStart = unicodeStart;
+        this.unicodeEnd = unicodeEnd;
+        this.textStart = textStart;
+        this.textEnd = textEnd;
+    }
+
+    public boolean isEmoji() {
+        return isEmoji;
+    }
+
+    public int getUnicodeStart() {
+        return unicodeStart;
+    }
+
+    public int getUnicodeEnd() {
+        return unicodeEnd;
+    }
+
+    public int getTextStart() {
+        return textStart;
+    }
+
+    public int getTextEnd() {
+        return textEnd;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) {
+            return true;
+        }
+        if (!(o instanceof EmojiRun)) {
+            return false;
+        }
+        EmojiRun that = (EmojiRun) o;
+        return isEmoji == that.isEmoji && unicodeStart == that.unicodeStart && unicodeEnd == that.unicodeEnd && textStart == that.textStart && textEnd == that.textEnd;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(isEmoji, unicodeStart, unicodeEnd, textStart, textEnd);
+    }
+}