package info.bliki.wiki.template;
import info.bliki.wiki.filter.AbstractParser;
import info.bliki.wiki.filter.AbstractParser.ParsedPageName;
import info.bliki.wiki.model.IWikiModel;
import info.bliki.wiki.namespaces.INamespace;
import java.util.List;
/**
* A template parser function for <code>{{ #ifexist: ... }}</code> syntax. See
* <a href="http://www.mediawiki.org/wiki/Help:Extension:ParserFunctions">
* Mediwiki's Help:Extension:ParserFunctions</a>
*
*/
public class Ifexist extends AbstractTemplateFunction {
public final static ITemplateFunction CONST = new Ifexist();
public Ifexist() {
}
@Override
public String parseFunction(List<String> list, IWikiModel model, char[] src, int beginIndex, int endIndex, boolean isSubst) {
if (list.size() > 1) {
String wikiTopicName = isSubst ? list.get(0) : parseTrim(list.get(0), model);
final INamespace namespace = model.getNamespace();
// note: appended "#section" does not count for the check whether a page exists or not!
// -> strip off
ParsedPageName parsedPagename = AbstractParser.parsePageName(model, wikiTopicName, namespace.getMain(), false, true);
String rawWikiContent = null;
// if parsing failed, e.g. double "::" at the page titles beginning, this is the same as if the page does not exist.
if (parsedPagename.valid) {
rawWikiContent = model.getRawWikiContent(parsedPagename, null);
}
if (rawWikiContent != null) {
return isSubst ? list.get(1) : parseTrim(list.get(1), model);
} else {
// the requested templateName doesn't exist
if (list.size() >= 3) {
return isSubst ? list.get(2) : parseTrim(list.get(2), model);
}
}
}
return null;
}
}