fix: improve error management for non-GPL version

src/net/sourceforge/plantuml/PSystemBuilder.java

@@ -66,6 +66,7 @@ import net.sourceforge.plantuml.eggs.PSystemColorsFactory;
 import net.sourceforge.plantuml.eggs.PSystemEggFactory;
 import net.sourceforge.plantuml.eggs.PSystemPathFactory;
 import net.sourceforge.plantuml.eggs.PSystemRIPFactory;
+import net.sourceforge.plantuml.eggs.PSystemUnsupported;
 import net.sourceforge.plantuml.eggs.PSystemWelcomeFactory;
 import net.sourceforge.plantuml.emoji.PSystemListEmojiFactory;
 import net.sourceforge.plantuml.error.PSystemError;
@@ -146,6 +147,9 @@ public class PSystemBuilder {
 			}
 
 			final DiagramType diagramType = umlSource.getDiagramType();
+			if (diagramType == DiagramType.UNKNOWN)
+				return new PSystemUnsupported(umlSource);
+
 			final List<PSystemError> errors = new ArrayList<>();
 			for (PSystemFactory systemFactory : factories) {
 				if (diagramType != systemFactory.getDiagramType())
@@ -159,6 +163,8 @@ public class PSystemBuilder {
 				}
 				errors.add((PSystemError) sys);
 			}
+			if (errors.size() == 0)
+				return new PSystemUnsupported(umlSource);
 
 			result = PSystemErrorUtils.merge(errors);
 			return result;

src/net/sourceforge/plantuml/core/DiagramType.java

@@ -39,7 +39,7 @@ import net.sourceforge.plantuml.utils.StartUtils;
 
 public enum DiagramType {
     // ::remove folder when __HAXE__
-	UML, BPM, DITAA, DOT, PROJECT, JCCKIT, SALT, FLOW, CREOLE, JUNGLE, CUTE, MATH, LATEX, DEFINITION, GANTT, NW,
+	UML, BPM, DITAA, DOT, PROJECT, JCCKIT, SALT, FLOW, CREOLE, MATH, LATEX, DEFINITION, GANTT, NW,
 	MINDMAP, WBS, WIRE, JSON, GIT, BOARD, YAML, HCL, EBNF, REGEX, FILES, UNKNOWN;
 
 	static public DiagramType getTypeFromArobaseStart(String s) {
@@ -59,11 +59,15 @@ public enum DiagramType {
 		if (StartUtils.startsWithSymbolAnd("startdot", s))
 			return DOT;
 
+		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__ or __LGPL__
 		if (StartUtils.startsWithSymbolAnd("startjcckit", s))
 			return JCCKIT;
+		// ::done
 
+		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__
 		if (StartUtils.startsWithSymbolAnd("startditaa", s))
 			return DITAA;
+		// ::done
 
 		if (StartUtils.startsWithSymbolAnd("startproject", s))
 			return PROJECT;
@@ -77,12 +81,6 @@ public enum DiagramType {
 		if (StartUtils.startsWithSymbolAnd("startcreole", s))
 			return CREOLE;
 
-		if (StartUtils.startsWithSymbolAnd("starttree", s))
-			return JUNGLE;
-
-		if (StartUtils.startsWithSymbolAnd("startcute", s))
-			return CUTE;
-
 		if (StartUtils.startsWithSymbolAnd("startmath", s))
 			return MATH;
 

src/net/sourceforge/plantuml/core/UmlSource.java

@@ -45,7 +45,6 @@ import net.sourceforge.plantuml.klimt.creole.Display;
 import net.sourceforge.plantuml.regex.Matcher2;
 import net.sourceforge.plantuml.regex.MyPattern;
 import net.sourceforge.plantuml.regex.Pattern2;
-import net.sourceforge.plantuml.text.BackSlash;
 import net.sourceforge.plantuml.text.StringLocated;
 import net.sourceforge.plantuml.utils.LineLocation;
 import net.sourceforge.plantuml.utils.StartUtils;

src/net/sourceforge/plantuml/eggs/PSystemUnsupported.java

@@ -0,0 +1,76 @@
+/* ========================================================================
+ * PlantUML : a free UML diagram generator
+ * ========================================================================
+ *
+ * (C) Copyright 2009-2024, Arnaud Roques
+ *
+ * Project Info:  https://plantuml.com
+ *
+ * If you like this project or if you find it useful, you can support us at:
+ *
+ * https://plantuml.com/patreon (only 1$ per month!)
+ * https://plantuml.com/paypal
+ *
+ * This file is part of PlantUML.
+ *
+ * PlantUML is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * PlantUML distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
+ * License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
+ * USA.
+ *
+ *
+ * Original Author:  Arnaud Roques
+ *
+ *
+ */
+package net.sourceforge.plantuml.eggs;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import net.sourceforge.plantuml.FileFormatOption;
+import net.sourceforge.plantuml.PlainDiagram;
+import net.sourceforge.plantuml.core.DiagramDescription;
+import net.sourceforge.plantuml.core.UmlSource;
+import net.sourceforge.plantuml.klimt.shape.GraphicStrings;
+import net.sourceforge.plantuml.klimt.shape.TextBlock;
+import net.sourceforge.plantuml.klimt.shape.UDrawable;
+import net.sourceforge.plantuml.version.License;
+import net.sourceforge.plantuml.version.Version;
+
+public class PSystemUnsupported extends PlainDiagram {
+
+	private final List<String> strings = new ArrayList<>();
+
+	public PSystemUnsupported(UmlSource source) {
+		super(source);
+		strings.add("<b>Diagram not supported by this release of PlantUML");
+		strings.add(Version.fullDescription());
+		strings.add("License " + new License().toString());
+	}
+
+	@Override
+	protected UDrawable getRootDrawable(FileFormatOption fileFormatOption) throws IOException {
+		return getGraphicStrings();
+	}
+
+	public TextBlock getGraphicStrings() {
+		return GraphicStrings.createBlackOnWhite(strings);
+	}
+
+	public DiagramDescription getDescription() {
+		return new DiagramDescription("(Unsupported)");
+	}
+
+}

src/net/sourceforge/plantuml/utils/StartUtils.java

@@ -55,14 +55,14 @@ public class StartUtils {
 		boolean inside = false;
 		for (int i = 0; i < s.length(); i++) {
 			final String tmp = s.substring(i, s.length());
-			if (startsWithSymbolAnd("start", tmp)) {
+			if (startsWithSymbolAnd("start", tmp))
 				return s.substring(0, i);
-			}
+
 			final String single = s.substring(i, i + 1);
 			if (inside) {
-				if (single.equals(">")) {
+				if (single.equals(">"))
 					inside = false;
-				}
+
 				continue;
 			}
 			if (single.equals("<")) {
@@ -81,9 +81,9 @@ public class StartUtils {
 
 	public static boolean isArobaseStartDiagram(String s) {
 		final String s2 = StringUtils.trinNoTrace(s);
-		if (s2.startsWith("@") == false && s2.startsWith("\\") == false) {
+		if (s2.startsWith("@") == false && s2.startsWith("\\") == false)
 			return false;
-		}
+
 		return DiagramType.getTypeFromArobaseStart(s2) != DiagramType.UNKNOWN;
 	}
 
@@ -97,9 +97,9 @@ public class StartUtils {
 
 	public static boolean startOrEnd(final StringLocated s) {
 		final String s2 = StringUtils.trinNoTrace(s.getString());
-		if (s2.startsWith("@") == false && s2.startsWith("\\") == false) {
+		if (s2.startsWith("@") == false && s2.startsWith("\\") == false)
 			return false;
-		}
+
 		return startsWithSymbolAnd("end", s2) || DiagramType.getTypeFromArobaseStart(s2) != DiagramType.UNKNOWN;
 	}
 

src/net/sourceforge/plantuml/version/License.java

@@ -58,7 +58,7 @@ public class License {
 
 	@Override
 	public String toString() {
-		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__ or __LGPL__
+		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__ or __LGPL__ or __GPLV2__
 		return "GPL";
 		// ::done
 		// ::uncomment when __CORE__ or __MIT__
@@ -76,6 +76,9 @@ public class License {
 		// ::uncomment when __LGPL__
 		// return "LGPL";
 		// ::done
+		// ::uncomment when __GPLV2__
+		// return "GPLv2";
+		// ::done
 	}
 
 	public static License getCurrent() {
@@ -155,7 +158,7 @@ public class License {
 	}
 
 	private void end3(final LicenseInfo licenseInfo, final List<String> text) {
-		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__ or __LGPL__
+		// ::comment when __CORE__ or __MIT__ or __EPL__ or __BSD__ or __ASL__ or __LGPL__ or __GPLV2__
 		text.add("PlantUML is free software; you can redistribute it and/or modify it");
 		text.add("under the terms of the GNU General Public License as published by");
 		text.add("the Free Software Foundation, either version 3 of the License, or");
@@ -188,6 +191,9 @@ public class License {
 		// ::uncomment when __LGPL__
 		// addLgpl(licenseInfo, text);
 		// ::done
+		// ::uncomment when __GPLV2__
+		// addGplv2(licenseInfo, text);
+		// ::done
 
 		text.add(" ");
 		if (licenseInfo.isValid() == false) {
@@ -370,7 +376,7 @@ public class License {
 //	}
 // ::done
 
-// ::uncomment when __LGPL__
+	// ::uncomment when __LGPL__
 //		private void addLgpl(final LicenseInfo licenseInfo, final List<String> text) {
 //			text.add("PlantUML is free software; you can redistribute it and/or modify it");
 //			text.add("under the terms of the GNU Lesser General Public License as published by");
@@ -385,7 +391,24 @@ public class License {
 //			text.add("You should have received a copy of the GNU Lesser General Public License");
 //			text.add("along with this library.  If not, see <https://www.gnu.org/licenses/>.");
 //		}
-// ::done
+	// ::done
+
+	// ::uncomment when __GPLV2__
+//		private void addGplv2(final LicenseInfo licenseInfo, final List<String> text) {
+//			text.add("PlantUML is free software; you can redistribute it and/or modify it");
+//			text.add("under the terms of the GNU General Public License V2 as published by");
+//			text.add("the Free Software Foundation, either version 2 of the License, or");
+//			text.add("(at your option) any later version.");
+//			text.add(" ");
+//			text.add("PlantUML distributed in the hope that it will be useful, but");
+//			text.add("WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY");
+//			text.add("or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public");
+//			text.add("License for more details.");
+//			text.add(" ");
+//			text.add("You should have received a copy of the GNU Lesser General Public License");
+//			text.add("along with this library.  If not, see <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>.");
+//		}
+	// ::done
 
 	public static void addLicenseInfo(final List<String> text, LicenseInfo licenseInfo) {
 		if (licenseInfo.getLicenseType() == LicenseType.NAMED) {