I need to transform some HTML text that has nested
tags to decorate 'matches' with a css attribute to highlight it (like firefox search).
I can't just do a simple replace (think if user searched for "img" for example), so I'm trying to just do the replace within the body text (not on tag attributes).
I have a pretty straightforward HTML parser that I think should do this:
final Pattern pat = Pattern.compile(srch, Pattern.CASE_INSENSITIVE);
Matcher m = pat.matcher(output);
if (m.find()) {
final StringBuffer ret = new StringBuffer(output.length()+100);
lastPos=0;
try {
new ParserDelegator().parse(new StringReader(output.toString()),
new HTMLEditorKit.ParserCallback () {
public void handleText(char[] data, int pos) {
ret.append(output.subSequence(lastPos, pos));
Matcher m = pat.matcher(new String(data));
ret.append(m.replaceAll("<span class=\"search\">$0</span>"));
lastPos=pos+data.length;
}
}, false);
ret.append(output.subSequence(lastPos, output.length()));
return ret;
} catch (Exception e) {
return output;
}
}
return output;
My problem is, when I debug this, the handleText is getting called with text that includes tags! It's like it's only going one level deep. Anyone know why? Is there some simple thing I need to do to HTMLParser (haven't used it much) to enable 'proper' behavior of nested tags?
PS - I figured it out myself - see answer below. Short answer is, it works fine if you pass it HTML, not pre-escaped HTML. Doh! Hope this helps someone else.
<span>example with <a href="#">nested</a> <p>more nesting</p>
</span> <!-- all this gets thrown together -->
