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PlantUML is a component that allows to quickly write diagrams from text.
There is a newer version: 1.2024.8
// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.syntax;

import java.util.Collections;
import java.util.List;

import net.sourceforge.plantuml.BlockUml;
import net.sourceforge.plantuml.ErrorUml;
import net.sourceforge.plantuml.OptionFlags;
import net.sourceforge.plantuml.SourceStringReader;
import net.sourceforge.plantuml.UmlDiagram;
import net.sourceforge.plantuml.core.Diagram;
import net.sourceforge.plantuml.error.PSystemError;
import net.sourceforge.plantuml.preproc.Defines;
import net.sourceforge.plantuml.text.BackSlash;
import net.sourceforge.plantuml.utils.LineLocation;
import net.sourceforge.plantuml.utils.LineLocationImpl;

public class SyntaxChecker {
    // ::remove folder when __HAXE__
	// ::remove file when __CORE__

	public static SyntaxResult checkSyntax(List source) {
		final StringBuilder sb = new StringBuilder();
		for (String s : source) {
			sb.append(s);
			sb.append(BackSlash.NEWLINE);
		}
		return checkSyntax(sb.toString());
	}

	public static SyntaxResult checkSyntax(String source) {
		OptionFlags.getInstance().setQuiet(true);
		final SyntaxResult result = new SyntaxResult();

		if (source.startsWith("@startuml\n") == false) {
			result.setError(true);
			result.setLineLocation(new LineLocationImpl("", null).oneLineRead());
			result.addErrorText("No @startuml/@enduml found");
			return result;
		}
		if (source.endsWith("@enduml\n") == false && source.endsWith("@enduml") == false) {
			result.setError(true);
			result.setLineLocation(lastLineNumber2(source));
			result.addErrorText("No @enduml found");
			return result;
		}
		final SourceStringReader sourceStringReader = new SourceStringReader(Defines.createEmpty(), source,
				Collections.emptyList());

		final List blocks = sourceStringReader.getBlocks();
		if (blocks.size() == 0) {
			result.setError(true);
			result.setLineLocation(lastLineNumber2(source));
			result.addErrorText("No @enduml found");
			return result;
		}
		final Diagram system = blocks.get(0).getDiagram();
		result.setCmapData(system.hasUrl());
		if (system instanceof UmlDiagram) {
			result.setUmlDiagramType(((UmlDiagram) system).getUmlDiagramType());
			result.setDescription(system.getDescription().getDescription());
		} else if (system instanceof PSystemError) {
			result.setError(true);
			final PSystemError sys = (PSystemError) system;
			result.setLineLocation(sys.getLineLocation());
			result.setSystemError(sys);
			for (ErrorUml er : sys.getErrorsUml())
				result.addErrorText(er.getError());
		} else {
			result.setDescription(system.getDescription().getDescription());
		}
		return result;
	}

	public static SyntaxResult checkSyntaxFair(String source) {
		final SyntaxResult result = new SyntaxResult();
		final SourceStringReader sourceStringReader = new SourceStringReader(Defines.createEmpty(), source,
				Collections.emptyList());

		final List blocks = sourceStringReader.getBlocks();
		if (blocks.size() == 0) {
			result.setError(true);
			result.setLineLocation(lastLineNumber2(source));
			result.addErrorText("No @enduml found");
			return result;
		}

		final Diagram system = blocks.get(0).getDiagram();
		result.setCmapData(system.hasUrl());
		if (system instanceof UmlDiagram) {
			result.setUmlDiagramType(((UmlDiagram) system).getUmlDiagramType());
			result.setDescription(system.getDescription().getDescription());
		} else if (system instanceof PSystemError) {
			result.setError(true);
			final PSystemError sys = (PSystemError) system;
			result.setLineLocation(sys.getLineLocation());
			for (ErrorUml er : sys.getErrorsUml()) {
				result.addErrorText(er.getError());
			}
			result.setSystemError(sys);
		} else {
			result.setDescription(system.getDescription().getDescription());
		}
		return result;
	}

	private static int lastLineNumber(String source) {
		int result = 0;
		for (int i = 0; i < source.length(); i++)
			if (source.charAt(i) == '\n')
				result++;

		return result;
	}

	private static LineLocation lastLineNumber2(String source) {
		LineLocationImpl result = new LineLocationImpl("", null).oneLineRead();
		for (int i = 0; i < source.length(); i++)
			if (source.charAt(i) == '\n')
				result = result.oneLineRead();

		return result;
	}
}