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takewhile.java
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80 lines (66 loc) · 2.37 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.takewhile", base = PyObject.class, doc = takewhile.takewhile_doc)
public class takewhile extends PyIterator {
public static final PyType TYPE = PyType.fromClass(takewhile.class);
private PyIterator iter;
public takewhile() {
super();
}
public takewhile(PyType subType) {
super(subType);
}
public takewhile(PyObject predicate, PyObject iterable) {
super();
takewhile___init__(predicate, iterable);
}
public static final String takewhile_doc =
"takewhile(predicate, iterable) --> takewhile object\n\n" +
"Return successive entries from an iterable as long as the\n" +
"predicate evaluates to true for each entry.";
/**
* Create an iterator that returns items from the iterable while <code>predicate(item)</code>
* is true. After which iteration is stopped.
*/
@ExposedNew
@ExposedMethod
final void takewhile___init__(PyObject[] args, String[] kwds) {
ArgParser ap = new ArgParser("takewhile", args, kwds, new String[] {"predicate", "iterable"}, 2);
ap.noKeywords();
PyObject predicate = ap.getPyObject(0);
PyObject iterable = ap.getPyObject(1);
takewhile___init__(predicate, iterable);
}
private void takewhile___init__(PyObject predicate, PyObject iterable) {
iter = new itertools.WhileIterator(predicate, iterable, false);
}
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));
}
}