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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.
/* +=======================================================================
 * |
 * |      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/liberapay (only 1€ per month!)
 * https://plantuml.com/paypal
 *
 *
 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License V2.
 *
 * THE ACCOMPANYING PROGRAM IS PROVIDED UNDER THE TERMS OF THIS ECLIPSE PUBLIC
 * LICENSE ("AGREEMENT"). [GNU General Public License V2]
 *
 * ANY USE, REPRODUCTION OR DISTRIBUTION OF THE PROGRAM CONSTITUTES
 * RECIPIENT'S ACCEPTANCE OF THIS AGREEMENT.
 *
 * You may obtain a copy of the License at
 *
 * https://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 *
 * 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.
 *
 * PlantUML can occasionally display sponsored or advertising messages. Those
 * messages are usually generated on welcome or error images and never on
 * functional diagrams.
 * See https://plantuml.com/professional if you want to remove them
 *
 * Images (whatever their format : PNG, SVG, EPS...) generated by running PlantUML
 * are owned by the author of their corresponding sources code (that is, their
 * textual description in PlantUML language). Those images are not covered by
 * this GPL v2 license.
 *
 * The generated images can then be used without any reference to the GPL v2 license.
 * It is not even necessary to stipulate that they have been generated with PlantUML,
 * although this will be appreciated by the PlantUML team.
 *
 * There is an exception : if the textual description in PlantUML language is also covered
 * by any license, then the generated images are logically covered
 * by the very same license.
 *
 * This is the IGY distribution (Install GraphViz by Yourself).
 * You have to install GraphViz and to setup the GRAPHVIZ_DOT environment variable
 * (see https://plantuml.com/graphviz-dot )
 *
 * Icons provided by OpenIconic :  https://useiconic.com/open
 * Archimate sprites provided by Archi :  http://www.archimatetool.com
 * Stdlib AWS provided by https://github.com/milo-minderbinder/AWS-PlantUML
 * Stdlib Icons provided https://github.com/tupadr3/plantuml-icon-font-sprites
 * ASCIIMathML (c) Peter Jipsen http://www.chapman.edu/~jipsen
 * ASCIIMathML (c) David Lippman http://www.pierce.ctc.edu/dlippman
 * CafeUndZopfli ported by Eugene Klyuchnikov https://github.com/eustas/CafeUndZopfli
 * Brotli (c) by the Brotli Authors https://github.com/google/brotli
 * Themes (c) by Brett Schwarz https://github.com/bschwarz/puml-themes
 * Twemoji (c) by Twitter at https://twemoji.twitter.com/
 *
 */
package net.sourceforge.plantuml.dot;

import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sourceforge.plantuml.StringUtils;

public class GraphvizVersionFinder {
	// ::remove file when __CORE__

	final private File dotExe;
	final public static GraphvizVersion DEFAULT = new GraphvizVersion() {
		public boolean useShieldForQuantifier() {
			return true;
		}

		public boolean useProtectionWhenThereALinkFromOrToGroup() {
			return true;
		}

		public boolean useXLabelInsteadOfLabel() {
			return false;
		}

		public boolean isVizjs() {
			return false;
		}

		public boolean ignoreHorizontalLinks() {
			return false;
		}
	};

	public GraphvizVersionFinder(File dotExe) {
		this.dotExe = dotExe;
	}

	public GraphvizVersion getVersion() {
		final String dotVersion = dotVersion();
		final Pattern p = Pattern.compile("(\\d+)\\.(\\d\\d?)");
		final Matcher m = p.matcher(dotVersion);
		final boolean find = m.find();
		if (find == false)
			return DEFAULT;

		final int major = Integer.parseInt(m.group(1));
		final int minor = Integer.parseInt(m.group(2));
		final int v = 100 * major + minor;
		return new GraphvizVersion() {
			public boolean useShieldForQuantifier() {
				return v <= 228;
			}

			public boolean useProtectionWhenThereALinkFromOrToGroup() {
				if (v == 239 || v == 240) {
					return false;
				}
				// return v < 238;
				return true;
			}

			public boolean useXLabelInsteadOfLabel() {
				return false;
			}

			public boolean isVizjs() {
				return false;
			}

			public boolean ignoreHorizontalLinks() {
				if (v == 230) {
					return true;
				}
				return false;
			}

		};
	}

	public String dotVersion() {
		final String cmd[] = getCommandLine();

		final ProcessRunner p = new ProcessRunner(cmd);
		final ProcessState state = p.run(null, null);
		if (state.differs(ProcessState.TERMINATED_OK()))
			return "?";

		final StringBuilder sb = new StringBuilder();
		if (StringUtils.isNotEmpty(p.getOut()))
			sb.append(p.getOut());

		if (StringUtils.isNotEmpty(p.getError())) {
			if (sb.length() > 0)
				sb.append(' ');

			sb.append(p.getError());
		}
		return StringUtils.trin(sb.toString().replace('\n', ' '));
	}

	private String[] getCommandLine() {
		return new String[] { dotExe.getAbsolutePath(), "-V" };
	}

}