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package bjc.utils.funcutils;
import bjc.utils.funcdata.FunctionalList;
import bjc.utils.funcdata.IList;
import java.util.Iterator;
import java.util.function.BiFunction;
final class TokenSplitter implements BiFunction<String, String, IList<String>> {
private String tokenToSplit;
public TokenSplitter(String tok) {
this.tokenToSplit = tok;
}
@Override
public IList<String> apply(String operatorName, String operatorRegex) {
if(operatorName == null)
throw new NullPointerException("Operator name must not be null");
else if(operatorRegex == null) throw new NullPointerException("Operator regex must not be null");
if(tokenToSplit.contains(operatorName)) {
if(StringUtils.containsOnly(tokenToSplit, operatorRegex))
return new FunctionalList<>(tokenToSplit);
IList<String> splitTokens = new FunctionalList<>(tokenToSplit.split(operatorRegex));
IList<String> result = new FunctionalList<>();
Iterator<String> itr = splitTokens.toIterable().iterator();
int tokenExpansionSize = splitTokens.getSize();
String elm = itr.next();
for(int i = 0; itr.hasNext(); elm = itr.next()) {
result.add(elm);
if(i != tokenExpansionSize) {
result.add(operatorName);
}
}
return result;
}
return new FunctionalList<>(tokenToSplit);
}
}
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