Cleanup seg ops

richtextfx/src/main/java/org/fxmisc/richtext/model/NodeSegmentOpsBase.java

@@ -30,12 +30,12 @@ public String realGetText(SEG seg) {
     }
 
     @Override
-    public SEG realSubsequence(SEG seg, int start, int end) {
+    public SEG realSubSequence(SEG seg, int start, int end) {
         return seg;
     }
 
     @Override
-    public SEG realSubsequence(SEG seg, int start) {
+    public SEG realSubSequence(SEG seg, int start) {
         return seg;
     }
 }

richtextfx/src/main/java/org/fxmisc/richtext/model/SegmentOpsBase.java

@@ -32,7 +32,7 @@ public final char charAt(SEG seg, int index) {
 
     @Override
     public final String getText(SEG seg) {
-        return seg == empty ? "\0" : realGetText(seg);
+        return seg == empty ? "" : realGetText(seg);
     }
     public abstract String realGetText(SEG seg);
 
@@ -48,18 +48,18 @@ public final SEG subSequence(SEG seg, int start, int end) {
         }
         return seg == empty || start == end
                 ? empty
-                : realSubsequence(seg, start, end);
+                : realSubSequence(seg, start, end);
     }
-    public abstract SEG realSubsequence(SEG seg, int start, int end);
+    public abstract SEG realSubSequence(SEG seg, int start, int end);
 
     @Override
     public final SEG subSequence(SEG seg, int start) {
         return seg == empty || length(seg) == start
                 ? empty
-                : realSubsequence(seg, start);
+                : realSubSequence(seg, start);
     }
-    public SEG realSubsequence(SEG seg, int start) {
-        return realSubsequence(seg, start, length(seg));
+    public SEG realSubSequence(SEG seg, int start) {
+        return realSubSequence(seg, start, length(seg));
     }
 
     @Override
@@ -75,7 +75,7 @@ public final SEG setStyle(SEG seg, S style) {
     public abstract SEG realSetStyle(SEG seg, S style);
 
     @Override
-    public final Optional<SEG> join(SEG currentSeg, SEG nextSeg) {
+    public Optional<SEG> join(SEG currentSeg, SEG nextSeg) {
         return Optional.empty();
     }
 

richtextfx/src/main/java/org/fxmisc/richtext/model/StyledText.java

@@ -23,43 +23,41 @@ public class StyledText<S>  {
      * of {@link org.fxmisc.richtext.GenericStyledArea} and similar classes if you are using this class as the SEG type.
      */
     public static <S> TextOps<StyledText<S>, S> textOps() {
-        return new TextOps<StyledText<S>, S>() {
-
-            private final StyledText<S> emptySeg = new StyledText<>("", null);
+        return new TextOpsBase<StyledText<S>, S>(new StyledText<>("", null)) {
 
             @Override
-            public int length(StyledText<S> styledText) {
+            public int realLength(StyledText<S> styledText) {
                 return styledText.getText().length();
             }
 
             @Override
-            public char charAt(StyledText<S> styledText, int index) {
-                return styledText == emptySeg ? '\0' : styledText.getText().charAt(index);
+            public char realCharAt(StyledText<S> styledText, int index) {
+                return styledText.getText().charAt(index);
             }
 
             @Override
-            public String getText(StyledText<S> styledText) {
+            public String realGetText(StyledText<S> styledText) {
                 return styledText.getText();
             }
 
             @Override
-            public StyledText<S> subSequence(StyledText<S> styledText, int start, int end) {
-                return styledText == emptySeg ? emptySeg : new StyledText<>(styledText.getText().substring(start, end), styledText.getStyle());
+            public StyledText<S> realSubSequence(StyledText<S> styledText, int start, int end) {
+                return new StyledText<>(styledText.getText().substring(start, end), styledText.getStyle());
             }
 
             @Override
-            public StyledText<S> subSequence(StyledText<S> styledText, int start) {
-                return styledText == emptySeg ? emptySeg : new StyledText<>(styledText.getText().substring(start), styledText.getStyle());
+            public StyledText<S> realSubSequence(StyledText<S> styledText, int start) {
+                return new StyledText<>(styledText.getText().substring(start), styledText.getStyle());
             }
 
             @Override
-            public S getStyle(StyledText<S> styledText) {
+            public S realGetStyle(StyledText<S> styledText) {
                 return styledText.getStyle();
             }
 
             @Override
-            public StyledText<S> setStyle(StyledText<S> seg, S style) {
-                return seg == emptySeg ? emptySeg : seg.setStyle(style);
+            public StyledText<S> realSetStyle(StyledText<S> seg, S style) {
+                return seg.setStyle(style);
             }
 
             @Override
@@ -69,11 +67,6 @@ public Optional<StyledText<S>> join(StyledText<S> left, StyledText<S> right) {
                         : Optional.empty();
             }
 
-            @Override
-            public StyledText<S> createEmpty() {
-                return emptySeg;
-            }
-
             @Override
             public StyledText<S> create(String text, S style) {
                 return new StyledText<>(text, style);

richtextfx/src/main/java/org/fxmisc/richtext/model/TextOpsBase.java

@@ -0,0 +1,8 @@
+package org.fxmisc.richtext.model;
+
+public abstract class TextOpsBase<SEG, S> extends SegmentOpsBase<SEG, S> implements TextOps<SEG, S> {
+
+    TextOpsBase(SEG empty) {
+        super(empty);
+    }
+}