markerfilter.java

BBS论坛设计JSP＋MYSQL

package com.bcxy.bbs.filter;

/**
 * Title:
 * Description:
 * Copyright:
 * Company: www.liyunet.com
 * 
 * @author lishujiang	
 * @version 1.0
 */

import java.util.HashMap;

public class MarkerFilter {

	private boolean filteringSubject;

	private boolean filteringBody;

	private HashMap colors;

	private String[] colorList;

	private String defaultColor;

	/**
	 * Creates a new filter not associated with a message. This is generally
	 * only useful for defining a template filter that other filters will be
	 * cloned from.
	 */
	public MarkerFilter() {
		filteringSubject = false;
		filteringBody = true;

		colors = new HashMap(12);
		colors.put("yellow", "#ffffaa");
		colors.put("orange", "#ffaa88");
		colors.put("purple", "#ffaaff");
		colors.put("cyan", "#aaffff");
		colors.put("red", "#ff8888");
		colors.put("green", "#88ffaa");
		colors.put("blue", "#88aaff");
		colors.put("gray", "#cccccc");

		colorList = (String[]) colors.values().toArray(
				new String[colors.size()]);
		defaultColor = "#ffffaa";
	}

	/**
	 * This method takes a string which may contain [img path] or [img=path]
	 * tags and replaces them with working image links. It does this by adding
	 * the html tag <img src="path">.
	 * <p>
	 * It also replaces a list of predefined strings with image links. These can
	 * for instance show smiley's instead of the :), :-( ascii.
	 * 
	 * @param input
	 *            the text to be converted.
	 * @return the input string with the URLs replaced with links.
	 */
	public String hiliteText(String input) {
		// Check if the string is null or zero length
		// -- if so, return what was sent in.
		if (input == null || input.length() == 0) {
			return input;
		}

		// Build the response in a buffer
		StringBuffer buf = new StringBuffer(input.length() + 100);
		char[] chars = input.toCharArray();
		String color = null;

		int index = -1, i = 0;
		int n, m;
		int patStart, patEnd;
		int colStart;
		int oldend = 0;
		int len = input.length();
		char cur;

		// handle the [img] pattern and the predefined strings replacements
		while (++index < len) {
			cur = chars[i = index];

			if (index + 6 < len && cur == '[' && chars[++i] == 'm'
					&& chars[++i] == 'a' && chars[++i] == 'r'
					&& chars[++i] == 'k') {

				// strip spaces
				while (++i < len && (chars[i] == ' ' || chars[i] == '='))
					;
				if (i < len) {
					// find the end of the tag
					colStart = i--;
					while (++i < len && chars[i] != ']')
						;

					if (colStart < i) {
						String arg = new String(chars, colStart, i - colStart);
						color = (String) colors.get(arg);

						if (color == null && "random".equals(arg)) {
							color = colorList[(int) (Math.random() * colorList.length)];
						}
					}
					if (color == null)
						color = defaultColor;

					if (++i < len) {
						patStart = patEnd = i;

						while (++patEnd < len) {
							if (patEnd + 6 < len && chars[i = patEnd] == '['
									&& chars[++i] == '/' && chars[++i] == 'm'
									&& chars[++i] == 'a' && chars[++i] == 'r'
									&& chars[++i] == 'k' && chars[++i] == ']') {
								break;
							}
						}

						buf.append(chars, oldend, index - oldend);
						buf.append("<B style=\"background-color:")
								.append(color).append("\">");
						buf.append(chars, patStart, patEnd - patStart);
						buf.append("</B>");

						oldend = (patEnd > i) ? patEnd : i + 1;
					}
				}
				index = i;
			}
		}
		if (oldend < len) {
			buf.append(chars, oldend, len - oldend);
		}
		return buf.toString();
	}

	public static void main(String args[]) {
		try {
			MarkerFilter filter = new MarkerFilter();
			String test = "[mark red]asdf[/mark]";

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}