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package org.grammaticalframework.pgf;
import java.util.*;
class Parser implements Iterable<ExprProb> {
private Concr concr;
private String s;
private String startCat;
private double heuristics;
private Map<String,LiteralCallback> callbacks;
private ExprIterator iter;
public Parser(Concr concr, String startCat, String s,
double heuristics,
Map<String,LiteralCallback> callbacks) throws ParseError {
this.concr = concr;
this.startCat = startCat;
this.s = s;
this.heuristics = heuristics;
this.callbacks = callbacks;
this.iter = doParse();
}
public Iterator<ExprProb> iterator() {
if (iter == null) {
// If someone has asked for a second iterator over
// the same parse results then we have to parse again.
try {
return doParse();
} catch (ParseError e) {
return null;
}
} else {
ExprIterator tmp_iter = iter;
iter = null;
return tmp_iter;
}
}
private ExprIterator doParse() throws ParseError
{
Pool pool = new Pool();
long callbacksRef = newCallbacksMap(concr, pool);
if (callbacks != null) {
for (Map.Entry<String, LiteralCallback> entry : callbacks.entrySet()) {
addLiteralCallback(concr, callbacksRef,
entry.getKey(), entry.getValue(),
pool);
}
}
return parseWithHeuristics(concr, startCat, s, heuristics, callbacksRef, pool);
}
static native long newCallbacksMap(Concr concr, Pool pool);
static native void addLiteralCallback(Concr concr, long callbacksRef, String cat, LiteralCallback callback, Pool pool);
static native ExprIterator parseWithHeuristics(Concr concr, String startCat, String s, double heuristics, long callbacksRef, Pool pool) throws ParseError;
}
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