Xml editor demo

richtextfx-demos/src/main/java/org/fxmisc/richtext/demo/XMLEditor.java

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+package org.fxmisc.richtext.demo;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.fxmisc.richtext.CodeArea;
+import org.fxmisc.richtext.LineNumberFactory;
+import org.fxmisc.richtext.StyleSpans;
+import org.fxmisc.richtext.StyleSpansBuilder;
+
+import javafx.application.Application;
+import javafx.scene.Scene;
+import javafx.scene.layout.StackPane;
+import javafx.stage.Stage;
+
+public class XMLEditor extends Application {
+
+    private static final Pattern XML_TAG = Pattern.compile("(?<ELEMENT>(</?\\h*)(\\w+)([^<>]*)(\\h*/?>))"
+    		+"|(?<COMMENT><!--[^<>]+-->)");
+
+    private static final Pattern ATTRIBUTES = Pattern.compile("(\\w+\\h*)(=)(\\h*\"[^\"]+\")");
+
+    private static final int GROUP_OPEN_BRACKET = 2;
+    private static final int GROUP_ELEMENT_NAME = 3;
+    private static final int GROUP_ATTRIBUTES_SECTION = 4;
+    private static final int GROUP_CLOSE_BRACKET = 5;
+    private static final int GROUP_ATTRIBUTE_NAME = 1;
+    private static final int GROUP_EQUAL_SYMBOL = 2;
+    private static final int GROUP_ATTRIBUTE_VALUE = 3;
+
+    private static final String sampleCode = String.join("\n", new String[] {
+    		"<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>",
+    		"<!-- Sample XML -->",
+    		"< orders >",
+    		"	<Order number=\"1\" table=\"center\">",
+    		"		<items>",
+    		"			<Item>",
+    		"				<type>ESPRESSO</type>",
+    		"				<shots>2</shots>",
+    		"				<iced>false</iced>",
+    		"				<orderNumber>1</orderNumber>",
+    		"			</Item>",
+    		"			<Item>",
+    		"				<type>CAPPUCCINO</type>",
+    		"				<shots>1</shots>",
+    		"				<iced>false</iced>",
+    		"				<orderNumber>1</orderNumber>",
+    		"			</Item>",
+    		"			<Item>",
+    		"			<type>LATTE</type>",
+    		"				<shots>2</shots>",
+    		"				<iced>false</iced>",
+    		"				<orderNumber>1</orderNumber>",
+    		"			</Item>",
+    		"			<Item>",
+    		"				<type>MOCHA</type>",
+    		"				<shots>3</shots>",
+    		"				<iced>true</iced>",
+    		"				<orderNumber>1</orderNumber>",
+    		"			</Item>",
+    		"		</items>",
+    		"	</Order>",
+    		"</orders>"
+    		});
+
+
+    public static void main(String[] args) {
+        launch(args);
+    }
+
+    @Override
+    public void start(Stage primaryStage) {
+        CodeArea codeArea = new CodeArea();
+        codeArea.setParagraphGraphicFactory(LineNumberFactory.get(codeArea));
+
+        codeArea.textProperty().addListener((obs, oldText, newText) -> {
+            codeArea.setStyleSpans(0, computeHighlighting(newText));
+        });
+        codeArea.replaceText(0, 0, sampleCode);
+
+        Scene scene = new Scene(new StackPane(codeArea), 600, 400);
+        scene.getStylesheets().add(JavaKeywordsAsync.class.getResource("xml-highlighting.css").toExternalForm());
+        primaryStage.setScene(scene);
+        primaryStage.setTitle("XML Editor Demo");
+        primaryStage.show();
+    }
+
+    private static StyleSpans<Collection<String>> computeHighlighting(String text) {
+
+        Matcher matcher = XML_TAG.matcher(text);
+        int lastKwEnd = 0;
+        StyleSpansBuilder<Collection<String>> spansBuilder = new StyleSpansBuilder<>();
+        while(matcher.find()) {
+
+        	spansBuilder.add(Collections.emptyList(), matcher.start() - lastKwEnd);
+        	if(matcher.group("COMMENT") != null) {
+        		spansBuilder.add(Collections.singleton("comment"), matcher.end() - matcher.start());
+        	}
+        	else {
+        		if(matcher.group("ELEMENT") != null) {
+        			String attributesText = matcher.group(GROUP_ATTRIBUTES_SECTION);
+
+        			spansBuilder.add(Collections.singleton("tagmark"), matcher.end(GROUP_OPEN_BRACKET) - matcher.start(GROUP_OPEN_BRACKET));
+        			spansBuilder.add(Collections.singleton("anytag"), matcher.end(GROUP_ELEMENT_NAME) - matcher.end(GROUP_OPEN_BRACKET));
+
+        			if(!attributesText.isEmpty()) {
+
+        				lastKwEnd = 0;
+
+        				Matcher amatcher = ATTRIBUTES.matcher(attributesText);
+        				while(amatcher.find()) {
+        					spansBuilder.add(Collections.emptyList(), amatcher.start() - lastKwEnd);
+        					spansBuilder.add(Collections.singleton("attribute"), amatcher.end(GROUP_ATTRIBUTE_NAME) - amatcher.start(GROUP_ATTRIBUTE_NAME));
+        					spansBuilder.add(Collections.singleton("tagmark"), amatcher.end(GROUP_EQUAL_SYMBOL) - amatcher.end(GROUP_ATTRIBUTE_NAME));
+        					spansBuilder.add(Collections.singleton("avalue"), amatcher.end(GROUP_ATTRIBUTE_VALUE) - amatcher.end(GROUP_EQUAL_SYMBOL));
+        					lastKwEnd = amatcher.end();
+        				}
+        				if(attributesText.length() > lastKwEnd)
+        					spansBuilder.add(Collections.emptyList(), attributesText.length() - lastKwEnd);
+        			}
+
+        			lastKwEnd = matcher.end(GROUP_ATTRIBUTES_SECTION);
+
+        			spansBuilder.add(Collections.singleton("tagmark"), matcher.end(GROUP_CLOSE_BRACKET) - lastKwEnd);
+        		}
+        	}
+            lastKwEnd = matcher.end();
+        }
+        spansBuilder.add(Collections.emptyList(), text.length() - lastKwEnd);
+        return spansBuilder.create();
+    }
+}

richtextfx-demos/src/main/resources/org/fxmisc/richtext/demo/xml-highlighting.css

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+.tagmark {
+    -fx-fill: gray;
+}
+.anytag {
+    -fx-fill: crimson;
+}
+.paren {
+    -fx-fill: firebrick;
+    -fx-font-weight: bold;
+}
+.attribute {
+    -fx-fill: darkviolet;
+}
+.avalue {
+    -fx-fill: black;
+}
+
+.comment {
+	-fx-fill: teal;
+}