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dropwhile.java
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80 lines (66 loc) · 2.42 KB
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/* Copyright (c) Jython Developers */
package org.python.modules.itertools;
import org.python.core.ArgParser;
import org.python.core.PyIterator;
import org.python.core.PyObject;
import org.python.core.PyType;
import org.python.core.Visitproc;
import org.python.expose.ExposedMethod;
import org.python.expose.ExposedNew;
import org.python.expose.ExposedType;
@ExposedType(name = "itertools.dropwhile", base = PyObject.class, doc = dropwhile.dropwhile_doc)
public class dropwhile extends PyIterator {
public static final PyType TYPE = PyType.fromClass(dropwhile.class);
private PyIterator iter;
public dropwhile() {
super();
}
public dropwhile(PyType subType) {
super(subType);
}
public dropwhile(PyObject predicate, PyObject iterable) {
super();
dropwhile___init__(predicate, iterable);
}
public static final String dropwhile_doc =
"dropwhile(predicate, iterable) --> dropwhile object\n\n" +
"Drop items from the iterable while predicate(item) is true.\n" +
"Afterwards, return every element until the iterable is exhausted.";
/**
* Create an iterator that drops items from the iterable while <code>predicate(item)</code>
* equals true. After which every remaining item of the iterable is returned.
*/
@ExposedNew
@ExposedMethod
final void dropwhile___init__(PyObject[] args, String[] kwds) {
ArgParser ap = new ArgParser("dropwhile", args, kwds, new String[] {"predicate", "iterable"}, 2);
ap.noKeywords();
PyObject predicate = ap.getPyObject(0);
PyObject iterable = ap.getPyObject(1);
dropwhile___init__(predicate, iterable);
}
private void dropwhile___init__(PyObject predicate, PyObject iterable) {
iter = new itertools.WhileIterator(predicate, iterable, true);
}
public PyObject __iternext__() {
return iter.__iternext__();
}
@ExposedMethod
@Override
public PyObject next() {
return doNext(__iternext__());
}
/* Traverseproc implementation */
@Override
public int traverse(Visitproc visit, Object arg) {
int retVal = super.traverse(visit, arg);
if (retVal != 0) {
return retVal;
}
return iter != null ? visit.visit(iter, arg) : 0;
}
@Override
public boolean refersDirectlyTo(PyObject ob) {
return ob != null && (iter == ob || super.refersDirectlyTo(ob));
}
}