Package com.lowagie.text.html

Source Code of com.lowagie.text.html.Markup

/*
* $Id: Markup.java 3533 2008-07-07 21:27:13Z Howard_s $
*
* 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.
*
* Contributions by:
* Lubos Strapko
*
* 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";

  /** a default value for font-size
     * @since 2.1.3
     */
  public static final float DEFAULT_FONT_SIZE = 12f;

  /**
   * 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) {
    // TODO: Evaluate the effect of this.
    // It may change the default behavour of the methd if this is changed.
    // return parseLength(string, Markup.DEFAULT_FONT_SIZE);
    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;
  }

  /**
   * New method contributed by: Lubos Strapko
   *
   * @since 2.1.3
   */
  public static float parseLength(String string, float actualFontSize) {
    if (string == null)
      return 0f;
    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;
    }
    // 1em is equal to the current font size
    if (string.startsWith("em")) {
      return f * actualFontSize;
    }
    // one ex is the x-height of a font (x-height is usually about half the
    // font-size)
    if (string.startsWith("ex")) {
      return f * actualFontSize / 2;
    }
    // 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 = 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();
  }

}
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