Theme Editor: do not mark token at caret if it does not occur elsewhere

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatOccurrenceMarker.java

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2020 FormDev Software GmbH
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.formdev.flatlaf.themeeditor;
+
+import org.fife.ui.rsyntaxtextarea.OccurrenceMarker;
+import org.fife.ui.rsyntaxtextarea.RSyntaxDocument;
+import org.fife.ui.rsyntaxtextarea.RSyntaxTextArea;
+import org.fife.ui.rsyntaxtextarea.RSyntaxTextAreaHighlighter;
+import org.fife.ui.rsyntaxtextarea.Token;
+import org.fife.ui.rsyntaxtextarea.TokenImpl;
+import org.fife.ui.rtextarea.SmartHighlightPainter;
+
+/**
+ * Delegating occurrence marker that does not mark token at caret if it does
+ * not occur elsewhere.
+ *
+ * @author Karl Tauber
+ */
+class FlatOccurrenceMarker
+	implements OccurrenceMarker
+{
+	private final OccurrenceMarker delegate;
+
+	FlatOccurrenceMarker( OccurrenceMarker delegate ) {
+		this.delegate = delegate;
+	}
+
+	@Override
+	public Token getTokenToMark( RSyntaxTextArea textArea ) {
+		return delegate.getTokenToMark( textArea );
+	}
+
+	@Override
+	public boolean isValidType( RSyntaxTextArea textArea, Token t ) {
+		return delegate.isValidType( textArea, t );
+	}
+
+	@Override
+	public void markOccurrences( RSyntaxDocument doc, Token t, RSyntaxTextAreaHighlighter h, SmartHighlightPainter p ) {
+		char[] lexeme = t.getLexeme().toCharArray();
+		int type = t.getType();
+		int lineCount = doc.getDefaultRootElement().getElementCount();
+
+		// make a copy of the token because it is overwritten in getTokenListForLine()
+		Token t2 = new TokenImpl( t );
+
+		// check whether token occurres more than once
+		boolean mark = false;
+		for( int i = 0; i < lineCount && !mark; i++ ) {
+			Token temp = doc.getTokenListForLine( i );
+			while( temp != null && temp.isPaintable() ) {
+				if( temp.is( type, lexeme ) && temp.getOffset() != t2.getOffset() ) {
+					mark = true;
+					break;
+				}
+				temp = temp.getNextToken();
+			}
+		}
+
+		if( mark )
+			delegate.markOccurrences( doc, t2, h, p );
+	}
+}

flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatThemeTokenMaker.java

@@ -16,6 +16,7 @@
 
 package com.formdev.flatlaf.themeeditor;
 
+import org.fife.ui.rsyntaxtextarea.OccurrenceMarker;
 import org.fife.ui.rsyntaxtextarea.RSyntaxUtilities;
 import org.fife.ui.rsyntaxtextarea.Token;
 import org.fife.ui.rsyntaxtextarea.TokenMap;
@@ -143,6 +144,11 @@ public class FlatThemeTokenMaker
 		return RSyntaxUtilities.isLetterOrDigit( ch ) || ch == '.' || ch == '_' || ch == '-';
 	}
 
+	@Override
+	protected OccurrenceMarker createOccurrenceMarker() {
+		return new FlatOccurrenceMarker( super.createOccurrenceMarker() );
+	}
+
 	@Override
 	public boolean getMarkOccurrencesOfTokenType( int type ) {
 		switch( type ) {