import java.util.List;
import java.util.Stack;
+import static eu.svjatoslav.commons.string.tokenizer.Terminator.TerminationStrategy.DROP;
+
public class Tokenizer {
final Stack<Integer> tokenIndexes = new Stack<>();
private final List<Terminator> terminators = new ArrayList<>();
- private final String source;
+ private String source;
private int currentIndex = 0;
public Tokenizer(final String source) {
this.source = source;
}
- public void addTerminator(final String startSequence,
- final boolean ignoreTerminator) {
- terminators.add(new Terminator(startSequence, ignoreTerminator));
+ public Tokenizer(){}
+
+ public Tokenizer setSource(String source){
+ this.source = source;
+ currentIndex = 0;
+ return this;
}
- public void addTerminator(final String startSequence,
- final String endSequence, final boolean ignoreTerminator) {
- terminators.add(new Terminator(startSequence, endSequence,
- ignoreTerminator));
+ public Tokenizer addTerminator(final String startSequence,
+ final Terminator.TerminationStrategy terminationStrategy) {
+ terminators.add(new Terminator(startSequence, terminationStrategy));
+ return this;
+ }
+
+ public Tokenizer addTerminator(final String startSequence,
+ final String endSequence, final Terminator.TerminationStrategy terminationStrategy) {
+ terminators.add(new Terminator(startSequence, endSequence, terminationStrategy));
+ return this;
}
public void expectNextToken(final String value)
for (final Terminator terminator : terminators)
if (sequenceMatches(terminator.startSequence))
- if (terminator.ignoreTerminator) {
+ if (terminator.termination == DROP) {
currentIndex += terminator.startSequence.length();
if (terminator.endSequence != null)
}
- public boolean probeNextToken(final String token) {
+ public boolean consumeIfNextToken(final String token) {
if (token.equals(getNextToken().token))
return true;
return false;
}
+ public TokenizerMatch peekNextToken(){
+ TokenizerMatch result = getNextToken();
+ unreadToken();
+ return result;
+ }
+
+ public boolean peekIsOneOf(String [] ... possibilities){
+ TokenizerMatch nextToken = peekNextToken();
+
+ for (String[] possibility : possibilities)
+ if (possibility.equals(nextToken))
+ return true;
+
+ return false;
+ }
+
+
public boolean sequenceMatches(final String sequence) {
if ((currentIndex + sequence.length()) > source.length())
return false;