/*
 * $Id$
 *
 * Copyright 2001, 2002 by Bruno Lowagie.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.html;

import java.awt.Color;
import java.util.Properties;
import java.util.StringTokenizer;


/**
 * A class that contains all the possible tagnames and their attributes.
 */

public class Markup {
	
	// iText specific
	
	/** the key for any tag */
	public static final String ITEXT_TAG = "tag";

	// HTML tags

	/** the markup for the body part of a file */
	public static final String HTML_TAG_BODY = "body";
	
	/** The DIV tag. */
	public static final String HTML_TAG_DIV = "div";

	/** This is a possible HTML-tag. */
	public static final String HTML_TAG_LINK = "link";

	/** The SPAN tag. */
	public static final String HTML_TAG_SPAN = "span";

	// HTML attributes

	/** the height attribute. */
	public static final String HTML_ATTR_HEIGHT = "height";

	/** the hyperlink reference attribute. */
	public static final String HTML_ATTR_HREF = "href";

	/** This is a possible HTML attribute for the LINK tag. */
	public static final String HTML_ATTR_REL = "rel";

	/** This is used for inline css style information */
	public static final String HTML_ATTR_STYLE = "style";

	/** This is a possible HTML attribute for the LINK tag. */
	public static final String HTML_ATTR_TYPE = "type";

	/** This is a possible HTML attribute. */
	public static final String HTML_ATTR_STYLESHEET = "stylesheet";

	/** the width attribute. */
	public static final String HTML_ATTR_WIDTH = "width";

	/** attribute for specifying externally defined CSS class */
	public static final String HTML_ATTR_CSS_CLASS = "class";

	/** The ID attribute. */
	public static final String HTML_ATTR_CSS_ID = "id";

	// HTML values
	
	/** This is a possible value for the language attribute (SCRIPT tag). */
	public static final String HTML_VALUE_JAVASCRIPT = "text/javascript";
	
	/** This is a possible HTML attribute for the LINK tag. */
	public static final String HTML_VALUE_CSS = "text/css";

	// CSS keys

	/** the CSS tag for background color */
	public static final String CSS_KEY_BGCOLOR = "background-color";

	/** the CSS tag for text color */
	public static final String CSS_KEY_COLOR = "color";

	/** CSS key that indicate the way something has to be displayed */
	public static final String CSS_KEY_DISPLAY = "display";

	/** the CSS tag for the font family */
	public static final String CSS_KEY_FONTFAMILY = "font-family";

	/** the CSS tag for the font size */
	public static final String CSS_KEY_FONTSIZE = "font-size";

	/** the CSS tag for the font style */
	public static final String CSS_KEY_FONTSTYLE = "font-style";

	/** the CSS tag for the font weight */
	public static final String CSS_KEY_FONTWEIGHT = "font-weight";

	/** the CSS tag for text decorations */
	public static final String CSS_KEY_LINEHEIGHT = "line-height";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_MARGIN = "margin";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_MARGINLEFT = "margin-left";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_MARGINRIGHT = "margin-right";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_MARGINTOP = "margin-top";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_MARGINBOTTOM = "margin-bottom";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_PADDING = "padding";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_PADDINGLEFT = "padding-left";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_PADDINGRIGHT = "padding-right";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_PADDINGTOP = "padding-top";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_PADDINGBOTTOM = "padding-bottom";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERCOLOR = "border-color";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERWIDTH = "border-width";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERWIDTHLEFT = "border-left-width";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERWIDTHRIGHT = "border-right-width";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERWIDTHTOP = "border-top-width";

	/** the CSS tag for the margin of an object */
	public static final String CSS_KEY_BORDERWIDTHBOTTOM = "border-bottom-width";

	/** the CSS tag for adding a page break when the document is printed */
	public static final String CSS_KEY_PAGE_BREAK_AFTER = "page-break-after";

	/** the CSS tag for adding a page break when the document is printed */
	public static final String CSS_KEY_PAGE_BREAK_BEFORE = "page-break-before";

	/** the CSS tag for the horizontal alignment of an object */
	public static final String CSS_KEY_TEXTALIGN = "text-align";

	/** the CSS tag for text decorations */
	public static final String CSS_KEY_TEXTDECORATION = "text-decoration";

	/** the CSS tag for text decorations */
	public static final String CSS_KEY_VERTICALALIGN = "vertical-align";

	/** the CSS tag for the visibility of objects */
	public static final String CSS_KEY_VISIBILITY = "visibility";

	// CSS values

	/** value for the CSS tag for adding a page break when the document is printed */
	public static final String CSS_VALUE_ALWAYS = "always";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_BLOCK = "block";

	/** a CSS value for text font weight */
	public static final String CSS_VALUE_BOLD = "bold";

	/** the value if you want to hide objects. */
	public static final String CSS_VALUE_HIDDEN = "hidden";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_INLINE = "inline";
	
	/** a CSS value for text font style */
	public static final String CSS_VALUE_ITALIC = "italic";

	/** a CSS value for text decoration */
	public static final String CSS_VALUE_LINETHROUGH = "line-through";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_LISTITEM = "list-item";
	
	/** a CSS value */
	public static final String CSS_VALUE_NONE = "none";

	/** a CSS value */
	public static final String CSS_VALUE_NORMAL = "normal";

	/** a CSS value for text font style */
	public static final String CSS_VALUE_OBLIQUE = "oblique";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_TABLE = "table";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_TABLEROW = "table-row";

	/** A possible value for the DISPLAY key */
	public static final String CSS_VALUE_TABLECELL = "table-cell";

	/** the CSS value for a horizontal alignment of an object */
	public static final String CSS_VALUE_TEXTALIGNLEFT = "left";

	/** the CSS value for a horizontal alignment of an object */
	public static final String CSS_VALUE_TEXTALIGNRIGHT = "right";

	/** the CSS value for a horizontal alignment of an object */
	public static final String CSS_VALUE_TEXTALIGNCENTER = "center";

	/** the CSS value for a horizontal alignment of an object */
	public static final String CSS_VALUE_TEXTALIGNJUSTIFY = "justify";

	/** a CSS value for text decoration */
	public static final String CSS_VALUE_UNDERLINE = "underline";

	/**
	 * Parses a length.
	 * 
	 * @param string
	 *            a length in the form of an optional + or -, followed by a
	 *            number and a unit.
	 * @return a float
	 */
	
	public static float parseLength(String string) {
		int pos = 0;
		int length = string.length();
		boolean ok = true;
		while (ok && pos < length) {
			switch (string.charAt(pos)) {
			case '+':
			case '-':
			case '0':
			case '1':
			case '2':
			case '3':
			case '4':
			case '5':
			case '6':
			case '7':
			case '8':
			case '9':
			case '.':
				pos++;
				break;
			default:
				ok = false;
			}
		}
		if (pos == 0)
			return 0f;
		if (pos == length)
			return Float.parseFloat(string + "f");
		float f = Float.parseFloat(string.substring(0, pos) + "f");
		string = string.substring(pos);
		// inches
		if (string.startsWith("in")) {
			return f * 72f;
		}
		// centimeters
		if (string.startsWith("cm")) {
			return (f / 2.54f) * 72f;
		}
		// millimeters
		if (string.startsWith("mm")) {
			return (f / 25.4f) * 72f;
		}
		// picas
		if (string.startsWith("pc")) {
			return f * 12f;
		}
		// default: we assume the length was measured in points
		return f;
	}

	/**
	 * Converts a <CODE>Color</CODE> into a HTML representation of this <CODE>
	 * Color</CODE>.
	 * 
	 * @param s
	 *            the <CODE>Color</CODE> that has to be converted.
	 * @return the HTML representation of this <COLOR>Color </COLOR>
	 */
	
	public static Color decodeColor(String s) {
	    if (s == null)
	        return null;
	    s = s.toLowerCase().trim();
	    Color c = (Color)WebColors.getRGBColor(s);
	    if (c != null)
	        return c;
	    try {
	        if (s.startsWith("#")) {
	            if (s.length() == 4)
	                s = "#" + s.substring(1, 2) + s.substring(1, 2)
	                    + s.substring(2, 3) + s.substring(2, 3) 
	                    + s.substring(3, 4) + s.substring(3, 4);
	            if (s.length() == 7)
	                return new Color(Integer.parseInt(s.substring(1), 16));
	        }
	        else if (s.startsWith("rgb")) {
	            StringTokenizer tk = new StringTokenizer(s.substring(3), " \t\r\n\f(),");
	            int[] cc = new int [3];
	            for (int k = 0; k < 3; ++k) {
	                if (!tk.hasMoreTokens())
	                    return null;
	                String t = tk.nextToken();
	                float n;
	                if (t.endsWith("%")) {
	                    n = Float.parseFloat(t.substring(0, t.length() - 1));
	                    n = n * 255f / 100f;
	                }
	                else
	                    n = Float.parseFloat(t);
	                int ni = (int)n;
	                if (ni > 255)
	                    ni = 255;
	                else if (ni < 0)
	                    ni = 0;
	                cc[k] = ni;
	            }
	            return new Color(cc[0], cc[1], cc[2]);
	        }
	    }
	    catch (Exception e) {
	    }
	    return null;
	}

	/**
	 * This method parses a String with attributes and returns a Properties
	 * object.
	 * 
	 * @param string
	 *            a String of this form: 'key1="value1"; key2="value2";...
	 *            keyN="valueN" '
	 * @return a Properties object
	 */
	public static Properties parseAttributes(String string) {
		Properties result = new Properties();
		if (string == null)
			return result;
		StringTokenizer keyValuePairs = new StringTokenizer(string, ";");
		StringTokenizer keyValuePair;
		String key;
		String value;
		while (keyValuePairs.hasMoreTokens()) {
			keyValuePair = new StringTokenizer(keyValuePairs.nextToken(), ":");
			if (keyValuePair.hasMoreTokens())
				key = keyValuePair.nextToken().trim();
			else
				continue;
			if (keyValuePair.hasMoreTokens())
				value = keyValuePair.nextToken().trim();
			else
				continue;
			if (value.startsWith("\""))
				value = value.substring(1);
			if (value.endsWith("\""))
				value = value.substring(0, value.length() - 1);
			result.setProperty(key.toLowerCase(), value);
		}
		return result;
	}

	/**
	 * Removes the comments sections of a String.
	 * 
	 * @param string
	 *            the original String
	 * @param startComment
	 *            the String that marks the start of a Comment section
	 * @param endComment
	 *            the String that marks the end of a Comment section.
	 * @return the String stripped of its comment section
	 */
	public static String removeComment(String string, String startComment,
			String endComment) {
		StringBuffer result = new StringBuffer();
		int pos = 0;
		int end = endComment.length();
		int start = string.indexOf(startComment, pos);
		while (start > -1) {
			result.append(string.substring(pos, start));
			pos = string.indexOf(endComment, start) + end;
			start = string.indexOf(startComment, pos);
		}
		result.append(string.substring(pos));
		return result.toString();
	}

}