package org.webslinger.ext.template.freemarker;

 import java.io.StringWriter;

 import java.util.regex.Pattern;

 public class WikiFreemarkerHelper {

     private static final Pattern PATTERN = Pattern.compile("(\n|\")");

     private final StringWriter writer;

     protected WikiFreemarkerHelper(StringWriter writer) {

         this.writer = writer;

     }

     protected void writeArg(String name, Object value) {

         if (value == null) return;

         writer.write(name);

         writer.write("=\"");

         if (value instanceof Number) {

             writer.write(value.toString());

         } else {

             String s = value instanceof String ? (String) value : value.toString();

             writer.write(PATTERN.matcher(s).replaceAll("\\\\$1"));

         }

         writer.write('"');

     }

     public void acceptMacro(String name, Object[] args) {

         writer.write("<@");

         writer.write(name);

         for (int i = 0; i < args.length;) {

             writer.write(' ');

             String argName = (String) args[i++];

             Object argValue = args[i++];

             writeArg(argName, argValue);

         }

         writer.write("/>");

     }

     public void endMacro(String name, Object[] args) {

         writer.write("</@");

         writer.write(name);

         writer.write('>');

     }

     public void startMacro(String name, Object[] args) {

         writer.write("<@");

         writer.write(name);

         for (int i = 0; i < args.length;) {

             writer.write(' ');

             String argName = (String) args[i++];

             Object argValue = args[i++];

             writeArg(argName, argValue);

         }

         writer.write(">");

     }

     public void acceptNewline(int count) {

         for (int i = 0; i < count; i++) {

             writer.write('\n');

         }

     }

     public void acceptText(String text) {

         writer.write(text);

     }

     public void close() {

     }

 }