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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 Lesser 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 Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library.  If not, see .
 *
 * 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 LGPL license.
 *
 * The generated images can then be used without any reference to the LGPL 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.klimt.creole.command;

import java.awt.image.BufferedImage;
import java.io.IOException;

import net.sourceforge.plantuml.FileSystem;
import net.sourceforge.plantuml.FileUtils;
import net.sourceforge.plantuml.StringUtils;
import net.sourceforge.plantuml.klimt.geom.ImgValign;
import net.sourceforge.plantuml.klimt.shape.TextBlock;
import net.sourceforge.plantuml.klimt.shape.TileImage;
import net.sourceforge.plantuml.klimt.shape.TileImageSvg;
import net.sourceforge.plantuml.log.Logme;
import net.sourceforge.plantuml.regex.Matcher2;
import net.sourceforge.plantuml.regex.MyPattern;
import net.sourceforge.plantuml.regex.Pattern2;
import net.sourceforge.plantuml.security.SFile;
import net.sourceforge.plantuml.security.SURL;

public class Img implements HtmlCommand {

	final static private Pattern2 srcPattern = MyPattern.cmpile("src[%s]*=[%s]*[\"%q]?([^%s\">]+)[\"%q]?");
	final static private Pattern2 vspacePattern = MyPattern.cmpile("vspace[%s]*=[%s]*[\"%q]?(\\d+)[\"%q]?");
	final static private Pattern2 valignPattern = MyPattern
			.cmpile("valign[%s]*=[%s]*[\"%q]?(top|bottom|middle)[\"%q]?");
	final static private Pattern2 noSrcColonPattern = MyPattern.cmpile(Splitter.imgPatternNoSrcColon);

	private final TextBlock tileImage;

	private Img(TextBlock image) {
		this.tileImage = image;
	}

	static int getVspace(String html) {
		final Matcher2 m = vspacePattern.matcher(html);
		if (m.find() == false)
			return 0;

		return Integer.parseInt(m.group(1));
	}

	static ImgValign getValign(String html) {
		final Matcher2 m = valignPattern.matcher(html);
		if (m.find() == false)
			return ImgValign.TOP;

		return ImgValign.valueOf(StringUtils.goUpperCase(m.group(1)));
	}

	static HtmlCommand getInstance(String html, boolean withSrc) {
		if (withSrc) {
			final Matcher2 m = srcPattern.matcher(html);
			final int vspace = getVspace(html);
			final ImgValign valign = getValign(html);
			return build(m, valign, vspace);
		}
		final Matcher2 m = noSrcColonPattern.matcher(html);
		return build(m, ImgValign.TOP, 0);
	}

	private static HtmlCommand build(final Matcher2 m, final ImgValign valign, final int vspace) {
		if (m.find() == false) {
			return new PlainText("(SYNTAX ERROR)");
		}
		final String src = m.group(1);
		try {
			final SFile f = FileSystem.getInstance().getFile(src);
			if (f.exists() == false) {
				// Check if valid URL
				if (src.startsWith("http:") || src.startsWith("https:")) {
					final SURL tmp = SURL.create(src);
					if (tmp == null)
						return new PlainText("(Cannot decode: " + src + ")");

					final BufferedImage read = tmp.readRasterImageFromURL();
					if (read == null)
						return new PlainText("(Cannot decode: " + src + ")");

					return new Img(new TileImage(read, valign, vspace));
				}
				return new PlainText("(Cannot decode: " + f + ")");
			}
			if (f.getName().endsWith(".svg")) {
				final String tmp = FileUtils.readSvg(f);
				if (tmp == null)
					return new PlainText("(Cannot decode: " + f + ")");

				return new Img(new TileImageSvg(tmp, 1));
			}
			final BufferedImage read = f.readRasterImageFromFile();
			if (read == null)
				return new PlainText("(Cannot decode: " + f + ")");

			return new Img(new TileImage(f.readRasterImageFromFile(), valign, vspace));
		} catch (IOException e) {
			Logme.error(e);
			return new PlainText("ERROR " + e.toString());
		}
	}

	public TextBlock createMonoImage() {
		return tileImage;
	}

}