/*
* Svjatoslav Commons - shared library of common functionality.
- * Copyright ©2012-2014, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
+ * Copyright ©2012-2017, Svjatoslav Agejenko, svjatoslav@svjatoslav.eu
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 3 of the GNU Lesser General Public License
import java.util.ArrayList;
import java.util.List;
import java.util.Stack;
+import java.util.stream.Stream;
+
+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 void expectNextToken(final String value)
+ public Tokenizer addTerminator(final String startSequence,
+ final String endSequence, final Terminator.TerminationStrategy terminationStrategy) {
+ terminators.add(new Terminator(startSequence, endSequence, terminationStrategy));
+ return this;
+ }
+
+ public void expectAndConsumeNextToken(final String value)
throws InvalidSyntaxException {
final TokenizerMatch match = getNextToken();
if (!value.equals(match.token))
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){
+ String nextToken = peekNextToken().token;
+ return Stream.of(possibilities).anyMatch(possibility -> possibility.equals(nextToken));
+ }
+
+ public void peekExpectNoneOf(String ... possibilities) throws InvalidSyntaxException {
+ if (peekIsOneOf(possibilities))
+ throw new InvalidSyntaxException("Not expected \"" + peekNextToken().token + "\" here.");
+ }
+
+
public boolean sequenceMatches(final String sequence) {
if ((currentIndex + sequence.length()) > source.length())
return false;