src/main/java/com/atlassian/uwc/converters/tikiwiki/HeaderConverter.java

package com.atlassian.uwc.converters.tikiwiki;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.log4j.Logger;

import com.atlassian.uwc.converters.BaseConverter;
import com.atlassian.uwc.ui.Page;

public class HeaderConverter extends BaseConverter {

    Logger log = Logger.getLogger(this.getClass());
    public void convert(Page page) {
        log.debug("Converting Headers - starting");
        String input = page.getOriginalText();
        String converted = convertHeaders(input);
        page.setConvertedText(converted);
        log.debug("Converting Header - complete");
    }

    Pattern headerPattern = Pattern.compile("(?<=^|\n)(!+)(.*)");
    protected String convertHeaders(String input) {
        Matcher headerFinder = headerPattern.matcher(input);

        StringBuffer sb = new StringBuffer();
        boolean found = false;
        while (headerFinder.find()) {
            found = true;
            String marks = headerFinder.group(1);
            String contents = headerFinder.group(2);
            int level = marks.length();
            if (!contents.startsWith(" ")) contents = " " + contents;
            String replacement = "h" + level + "." + contents;
            headerFinder.appendReplacement(sb, Matcher.quoteReplacement(replacement));
        }
        if (found) {
            headerFinder.appendTail(sb);
            return sb.toString();
        }
        return input;
    }

}