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package bjc.utils.parserutils.delims;
import java.util.function.Function;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import bjc.data.IPair;
import bjc.data.Pair;
/**
* A predicated opener for use with {@link RegexCloser}
*
* @author bjculkin
*
*/
public class RegexOpener implements Function<String, IPair<String, String[]>> {
/* The name of the group. */
private final String name;
/* The pattern that marks an opening group. */
private final Pattern patt;
/**
* Create a new regex opener.
*
* @param groupName
* The name of the opened group.
*
* @param groupRegex
* The regex that matches the opener.
*/
public RegexOpener(final String groupName, final String groupRegex) {
name = groupName;
patt = Pattern.compile(groupRegex);
}
@Override
public IPair<String, String[]> apply(final String str) {
final Matcher m = patt.matcher(str);
if(m.matches()) {
final int numGroups = m.groupCount();
final String[] parms = new String[numGroups + 1];
for(int i = 0; i <= numGroups; i++) {
parms[i] = m.group(i);
}
return new Pair<>(name, parms);
}
return new Pair<>(null, null);
}
}
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