CommandSpriteBase64.java

/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 * 
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 * PlantUML distributed in the hope that it will be useful, but
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 * License for more details.
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 * Original Author:  Arnaud Roques
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package net.sourceforge.plantuml.command;

import java.io.IOException;

import net.sourceforge.plantuml.TitledDiagram;
import net.sourceforge.plantuml.klimt.sprite.SpriteImage;
import net.sourceforge.plantuml.regex.IRegex;
import net.sourceforge.plantuml.regex.RegexConcat;
import net.sourceforge.plantuml.regex.RegexLeaf;
import net.sourceforge.plantuml.regex.RegexResult;
import net.sourceforge.plantuml.security.SImageIO;
import net.sourceforge.plantuml.utils.Base64Coder;
import net.sourceforge.plantuml.utils.LineLocation;

public class CommandSpriteBase64 extends SingleLineCommand2<TitledDiagram> {

	public static final CommandSpriteBase64 ME = new CommandSpriteBase64();

	private CommandSpriteBase64() {
		super(getRegexConcat());
	}

	private static IRegex getRegexConcat() {
		return RegexConcat.build(CommandSpriteBase64.class.getName(), //
				RegexLeaf.start(), //
				new RegexLeaf("sprite"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("\\$?"), //
				new RegexLeaf(1, "NAME", "([-.%pLN_]+)"), //
				RegexLeaf.spaceOneOrMore(), //
				new RegexLeaf("data:image/png;base64,"), //
				new RegexLeaf(1, "DATA", "([A-Za-z0-9+/=]+)"), //
				RegexLeaf.end());
	}

	@Override
	protected CommandExecutionResult executeArg(TitledDiagram system, LineLocation location, RegexResult arg,
			ParserPass currentPass) {
		final String base64 = arg.get("DATA", 0);
		final byte[] bytes = Base64Coder.decode(base64);
		try {
			system.addSprite(arg.get("NAME", 0), new SpriteImage(SImageIO.read(bytes)));
			return CommandExecutionResult.ok();
		} catch (IOException e) {
			return CommandExecutionResult.error("Cannot decode Base64 PNG sprite.");
		}
	}

}