Added a new BBCode parser

src/zutil/parser/BBCodeParser.java

@@ -0,0 +1,169 @@
+package zutil.parser;
+
+import java.util.HashMap;
+
+/**
+ * Parses BBCode and replaces them with the corresponding HTML.
+ * 
+ * @author Ziver
+ */
+public class BBCodeParser {
+	/** Contains all the BBCodes and the corresponding HTML **/
+	private HashMap<String, String> bbcodes;
+	
+	public static void main(String[] args){
+		BBCodeParser parser = new BBCodeParser();
+		System.out.println(parser.parse("jshdkj [u]lol [apa]lol[/apa]"));
+		System.out.println(parser.parse("jshdkj [m]lol[/k] [i]lol[/i]"));
+		System.out.println(parser.parse("jshdkj [m"));
+		System.out.println(parser.parse("jshdkj [/m"));
+		System.out.println(parser.parse("jshdkj m]"));
+	}
+	
+	/**
+	 * Initiates a instance of the parser with the most used BBCodes.
+	 */
+	public BBCodeParser(){
+		bbcodes = new HashMap<String,String>();
+		addBBCode("b", "<b>%2</b>");
+		addBBCode("i", "<i>%2</i>");
+		addBBCode("u", "<u>%2</u>");
+		addBBCode("url", "<a href=\"%1\">%2</a>");
+		addBBCode("img", "<img src=\"%2\"></img>");
+		addBBCode("quote", "<blockquote>%2</blockquote>");
+		addBBCode("code", "<pre>%2</pre>");
+		addBBCode("size", "<span style=\"font-size:%1px;\">%2</span>");
+		addBBCode("color", "<span style=\"color: %1;\">%2</span>");
+		addBBCode("ul", "<ul>%2</ul>");
+		addBBCode("li", "<li>%2</li>");
+	}
+	
+	/**
+	 * Registers a new BBCode to the parser. Only one type of BBCode allowed.
+	 * 
+	 * @param bbcode is the BBCode e.g. "b" or "url"
+	 * @param html is the corresponding HTML e.g. "<a href='%1'>%2</a>" 
+	 * 				where the %x corresponds to BBCode like this: [url=%1]%2[/url] 
+	 */
+	public void addBBCode(String bbcode, String html){
+		bbcodes.put(bbcode, html);
+	}
+	
+	/**
+	 * Removes a BBCode definition from the parser
+	 * 
+	 * @param bbcode is the bbcode to remove
+	 */
+	public void removeBBCode(String bbcode){
+		bbcodes.remove(bbcode);
+	}
+	
+	/**
+	 * Parses the text with BBCode and converts it to HTML
+	 * 
+	 * @param text is a String with BBCode
+	 * @return a String where all BBCode has been replaced by HTML
+	 */
+	public String parse(String text){
+		StringBuilder out = new StringBuilder();
+		StringBuilder t = new StringBuilder(text);
+		
+		parse(t, out, "");
+		
+		return out.toString();
+	}
+	
+	private void parse(StringBuilder text, StringBuilder out, String rootBBC){
+		StringBuilder bbcode = null;
+		boolean closeTag = false;
+		while(text.length() > 0){
+			char c = text.charAt(0);
+			if(c == '['){
+				bbcode = new StringBuilder();
+			}
+			else if(c == '/'){
+				closeTag = true;
+			}
+			else if(bbcode!=null){
+				String param = "";
+				switch(c){
+				case '=':
+					param = parseParam(text);
+				case ']':
+					String bbcode_cache = bbcode.toString();
+					if(closeTag){
+						if(!rootBBC.equals(bbcode_cache)){
+							out.append("[/").append(bbcode).append("]");
+						}
+						return;
+					}
+					String value = parseValue(text, bbcode_cache);
+					if(bbcodes.containsKey( bbcode_cache )){
+						String html = bbcodes.get( bbcode_cache );
+						html = html.replaceAll("%1", param);
+						html = html.replaceAll("%2", value);
+						out.append(html);
+					}
+					else{
+						out.append('[').append(bbcode);
+						if(!param.isEmpty()) 
+							out.append('=').append(param);
+						out.append(']').append(value);
+						out.append("[/").append(bbcode).append("]");
+					}
+					bbcode = null;
+					break;
+				default:
+					bbcode.append(c);
+					break;
+				}
+			}
+			else
+				out.append(c);
+			if(text.length()>0)
+				text.deleteCharAt(0);
+		}
+		if(bbcode!=null)
+			if(closeTag)out.append("[/").append(bbcode);
+			else 		out.append('[').append(bbcode);
+	}
+	
+	/**
+	 * Parses a parameter from a BBCode block: [url=param]
+	 * 
+	 * @param text is the text to parse from
+	 * @return only the parameter string
+	 */
+	private String parseParam(StringBuilder text){
+		StringBuilder param = new StringBuilder();
+		while(text.length() > 0){
+			char c = text.charAt(0);
+			if(c == ']')
+				break;
+			else if(c != '=') 
+				param.append(c);
+			text.deleteCharAt(0);
+		}
+		return param.toString();
+	}
+	
+	/**
+	 * Parses the value in the BBCodes e.g. [url]value[/url]
+	 * 
+	 * @param text is the text to parse the value from
+	 */
+	private String parseValue(StringBuilder text, String bbcode){
+		StringBuilder value = new StringBuilder();
+		while(text.length() > 0){
+			char c = text.charAt(0);
+			if(c == '['){
+				parse(text, value, bbcode);
+				break;
+			}
+			else if(c != ']') 
+				value.append(c);
+			text.deleteCharAt(0);
+		}
+		return value.toString();
+	}
+}