markup.java

处理PDF

	/** 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();
	}

}