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PlantUML is a component that allows to quickly write : * sequence diagram, * use case diagram, * class diagram, * activity diagram, * component diagram, * state diagram * object diagram

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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2013, Arnaud Roques
 *
 * Project Info:  http://plantuml.sourceforge.net
 * 
 * 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.
 *
 * [Java is a trademark or registered trademark of Sun Microsystems, Inc.
 * in the United States and other countries.]
 *
 * Original Author:  Arnaud Roques
 * 
 * Revision $Revision: 9786 $
 *
 */
package net.sourceforge.plantuml.graphic;

import java.awt.Font;
import java.util.EnumSet;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import net.sourceforge.plantuml.ugraphic.UFont;

public enum FontStyle {
	PLAIN, ITALIC, BOLD, UNDERLINE, STRIKE, WAVE, BACKCOLOR;

	public UFont mutateFont(UFont font) {
		if (this == ITALIC) {
			return font.deriveStyle(font.getStyle() | Font.ITALIC);
		}
		if (this == BOLD) {
			return font.deriveStyle(font.getStyle() | Font.BOLD);
		}
		return font;
	}

	public String getActivationPattern() {
		if (this == ITALIC) {
			return "\\<[iI]\\>";
		}
		if (this == BOLD) {
			return "\\<[bB]\\>";
		}
		if (this == UNDERLINE) {
			return "\\<[uU](?::(#[0-9a-fA-F]{6}|\\w+))?\\>";
		}
		if (this == WAVE) {
			return "\\<[wW](?::(#[0-9a-fA-F]{6}|\\w+))?\\>";
		}
		if (this == BACKCOLOR) {
			return "\\<[bB][aA][cC][kK](?::(#[0-9a-fA-F]{6}|\\w+))?\\>";
		}
		if (this == STRIKE) {
			return "\\<(?:s|S|strike|STRIKE|del|DEL)(?::(#[0-9a-fA-F]{6}|\\w+))?\\>";
		}
		return null;
	}

	HtmlColor getExtendedColor(String s) {
		final Matcher m = Pattern.compile(getActivationPattern()).matcher(s);
		if (m.find() == false || m.groupCount() != 1) {
			return null;
		}
		final String color = m.group(1);
		if (HtmlColorUtils.getColorIfValid(color) != null) {
			return HtmlColorUtils.getColorIfValid(color);
		}
		return null;
	}

	public String getDeactivationPattern() {
		if (this == ITALIC) {
			return "\\";
		}
		if (this == BOLD) {
			return "\\";
		}
		if (this == UNDERLINE) {
			return "\\";
		}
		if (this == WAVE) {
			return "\\";
		}
		if (this == BACKCOLOR) {
			return "\\";
		}
		if (this == STRIKE) {
			return "\\";
		}
		return null;
	}

	public static FontStyle getStyle(String line) {
		for (FontStyle style : EnumSet.allOf(FontStyle.class)) {
			if (style == FontStyle.PLAIN) {
				continue;
			}
			if (line.matches(style.getActivationPattern()) || line.matches(style.getDeactivationPattern())) {
				return style;
			}
		}
		throw new IllegalArgumentException(line);
	}

}