application.ui.preview.XMLStyleHelper Maven / Gradle / Ivy

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package application.ui.preview;

import java.util.Collection;
import java.util.Collections;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.fxmisc.richtext.model.StyleSpans;
import org.fxmisc.richtext.model.StyleSpansBuilder;

class XMLStyleHelper {
	private static final Pattern XML_TAG = Pattern
			.compile("(?(]*)(\\h*/?>))" + "|(?)" + "|(?<\\?[^<>]+\\?>)" + "|(?&[^&;]+;)");

	private static final Pattern ATTRIBUTES = Pattern.compile("(\\w[\\w-]*(?:\\:\\w[\\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;
	
	static StyleSpans> noStyles(String text) {
		StyleSpansBuilder> spansBuilder = new StyleSpansBuilder<>();
		spansBuilder.add(Collections.emptyList(), text.length());
		return spansBuilder.create();
	}

	static StyleSpans> computeHighlighting(String text) {
		Matcher matcher = XML_TAG.matcher(text);
		int lastKwEnd = 0;
		StyleSpansBuilder> 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("PI") != null) {
				spansBuilder.add(Collections.singleton("pi"), matcher.end() - matcher.start());
			} else if (matcher.group("ENTITY") != null) {
				spansBuilder.add(Collections.singleton("entity"), 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();
	}
}