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690 lines (635 loc) · 23.9 KB
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package org.python.core;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Comparator;
import java.util.ConcurrentModificationException;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
import org.python.util.Generic;
/**
* Proxy Java objects implementing java.util.List with Python methods corresponding to the standard
* list type
*/
class JavaProxyList {
@Untraversable
private static class ListMethod extends PyBuiltinMethodNarrow {
protected ListMethod(String name, int numArgs) {
super(name, numArgs);
}
protected ListMethod(String name, int minArgs, int maxArgs) {
super(name, minArgs, maxArgs);
}
protected List asList() {
return (List) self.getJavaProxy();
}
protected List newList() {
try {
return (List) asList().getClass().getDeclaredConstructor().newInstance();
} catch (ReflectiveOperationException | SecurityException
| IllegalArgumentException e) {
throw Py.JavaError(e);
}
}
/**
* Compares this object with other to check for equality. Used to implement __eq __ and
* __ne__. May return null if the other object cannot be compared i.e. is not a Python list
* or Java List.
*
* @param other The object to compare to this
* @return true is equal, false if not equal and null if we can't compare
*/
protected PyBoolean isEqual(PyObject other) {
if (isPyList(other)) {
// Being compared to a Python list
PyList oList = (PyList) other;
List jList = asList();
if (jList.size() != oList.size()) {
// Size mismatched so not equal
return Py.False;
}
for (int i = 0; i < jList.size(); i++) {
// Do element by element comparison, if any elements are not equal return false
if (!Py.java2py(jList.get(i))._eq(oList.pyget(i)).__nonzero__()) {
return Py.False;
}
}
// All elements are equal so the lists are equal
return Py.True;
} else {
// Being compared to something that is not a Python list
Object oj = other.getJavaProxy();
if (oj instanceof List) {
// Being compared to a Java List
List oList = (List) oj;
List jList = asList();
if (jList.size() != oList.size()) {
// Size mismatched so not equal
return Py.False;
}
for (int i = 0; i < jList.size(); i++) {
/*
* Do element by element comparison, if any elements are not equal return
* false.
*/
if (!Py.java2py(jList.get(i))._eq(Py.java2py(oList.get(i))).__nonzero__()) {
return Py.False;
}
}
// All elements are equal so the lists are equal
return Py.True;
} else {
/*
* other is not a Python or Java list, so we don't know if were equal therefore
* return null.
*/
return null;
}
}
}
private boolean isPyList(PyObject object) {
return object.getType().isSubType(PyList.TYPE);
}
}
protected static class ListIndexDelegate extends SequenceIndexDelegate {
private final List list;
public ListIndexDelegate(List list) {
this.list = list;
}
@Override
public void delItem(int idx) {
list.remove(idx);
}
@Override
public PyObject getItem(int idx) {
return Py.java2py(list.get(idx));
}
@Override
public PyObject getSlice(int start, int stop, int step) {
if (step > 0 && stop < start) {
stop = start;
}
int n = PySequence.sliceLength(start, stop, step);
List newList;
try {
newList = list.getClass().getDeclaredConstructor().newInstance();
} catch (ReflectiveOperationException | SecurityException
| IllegalArgumentException e) {
throw Py.JavaError(e);
}
int j = 0;
for (int i = start; j < n; i += step) {
newList.add(list.get(i));
j++;
}
return Py.java2py(newList);
}
@Override
public String getTypeName() {
return list.getClass().getName();
}
@Override
public int len() {
return list.size();
}
protected int fixBoundIndex(PyObject index) {
PyInteger length = Py.newInteger(len());
if (index._lt(Py.Zero).__nonzero__()) {
index = index._add(length);
if (index._lt(Py.Zero).__nonzero__()) {
index = Py.Zero;
}
} else if (index._gt(length).__nonzero__()) {
index = length;
}
int i = index.asIndex();
assert i >= 0;
return i;
}
@Override
public void setItem(int idx, PyObject value) {
list.set(idx, value.__tojava__(Object.class));
}
@Override
public void setSlice(int start, int stop, int step, PyObject value) {
if (stop < start) {
stop = start;
}
if (JyAttribute.getAttr(value, JyAttribute.JAVA_PROXY_ATTR) == this.list) {
List xs = Generic.list();
xs.addAll(this.list);
setsliceList(start, stop, step, xs);
} else if (value instanceof PyList) {
setslicePyList(start, stop, step, (PyList) value);
} else {
Object valueList = value.__tojava__(List.class);
if (valueList != null && valueList != Py.NoConversion) {
setsliceList(start, stop, step, (List) valueList);
} else {
setsliceIterator(start, stop, step, value.asIterable().iterator());
}
}
}
final private void setsliceList(int start, int stop, int step, List value) {
if (step == 1) {
list.subList(start, stop).clear();
list.addAll(start, value);
} else {
int size = list.size();
Iterator<Object> iter = value.listIterator();
for (int j = start; iter.hasNext(); j += step) {
Object item = iter.next();
if (j >= size) {
list.add(item);
} else {
list.set(j, item);
}
}
}
}
final private void setsliceIterator(int start, int stop, int step, Iterator<PyObject> iter) {
if (step == 1) {
List insertion = new ArrayList();
if (iter != null) {
while (iter.hasNext()) {
insertion.add(iter.next().__tojava__(Object.class));
}
}
list.subList(start, stop).clear();
list.addAll(start, insertion);
} else {
int size = list.size();
for (int j = start; iter.hasNext(); j += step) {
Object item = iter.next().__tojava__(Object.class);
if (j >= size) {
list.add(item);
} else {
list.set(j, item);
}
}
}
}
final private void setslicePyList(int start, int stop, int step, PyList value) {
if (step == 1) {
list.subList(start, stop).clear();
int n = value.getList().size();
for (int i = 0, j = start; i < n; i++, j++) {
Object item = value.getList().get(i).__tojava__(Object.class);
list.add(j, item);
}
} else {
int size = list.size();
Iterator<PyObject> iter = value.getList().listIterator();
for (int j = start; iter.hasNext(); j += step) {
Object item = iter.next().__tojava__(Object.class);
if (j >= size) {
list.add(item);
} else {
list.set(j, item);
}
}
}
}
@Override
public void delItems(int start, int stop) {
int n = stop - start;
while (n-- > 0) {
delItem(start);
}
}
}
@Untraversable
private static class ListMulProxyClass extends ListMethod {
protected ListMulProxyClass(String name, int numArgs) {
super(name, numArgs);
}
@Override
public PyObject __call__(PyObject obj) {
List jList = asList();
int mult = obj.asInt();
List newList = null;
// anything below 0 multiplier, we return an empty list
if (mult > 0) {
try {
newList = new ArrayList(jList.size() * mult);
// otherwise, extend it x times, where x is int-cast from obj
for (; mult > 0; mult--) {
for (Object entry : jList) {
newList.add(entry);
}
}
} catch (OutOfMemoryError t) {
throw Py.MemoryError("");
}
} else {
newList = Collections.EMPTY_LIST;
}
return Py.java2py(newList);
}
}
private static class KV {
private final PyObject key;
private final Object value;
KV(PyObject key, Object value) {
this.key = key;
this.value = value;
}
}
private static class KVComparator implements Comparator<KV> {
private final PyObject cmp;
KVComparator(PyObject cmp) {
this.cmp = cmp;
}
@Override
public int compare(KV o1, KV o2) {
int result;
if (cmp != null && cmp != Py.None) {
PyObject pyresult = cmp.__call__(o1.key, o2.key);
if (pyresult instanceof PyInteger || pyresult instanceof PyLong) {
return pyresult.asInt();
} else {
throw Py.TypeError(
String.format("comparison function must return int, not %.200s",
pyresult.getType().fastGetName()));
}
} else {
result = o1.key._cmp(o2.key);
}
return result;
}
@Override
public boolean equals(Object o) {
if (o == this) {
return true;
}
if (o instanceof KVComparator) {
return cmp.equals(((KVComparator) o).cmp);
}
return false;
}
}
private synchronized static void list_sort(List list, PyObject cmp, PyObject key, boolean reverse) {
int size = list.size();
final ArrayList<KV> decorated = new ArrayList(size);
for (Object value : list) {
PyObject pyvalue = Py.java2py(value);
if (key == null || key == Py.None) {
decorated.add(new KV(pyvalue, value));
} else {
decorated.add(new KV(key.__call__(pyvalue), value));
}
}
// we will rebuild the list from the decorated version
list.clear();
KVComparator c = new KVComparator(cmp);
if (reverse) {
Collections.reverse(decorated); // maintain stability of sort by reversing first
}
Collections.sort(decorated, c);
if (reverse) {
Collections.reverse(decorated);
}
boolean modified = list.size() > 0;
for (KV kv : decorated) {
list.add(kv.value);
}
if (modified) {
throw Py.ValueError("list modified during sort");
}
}
private static final PyBuiltinMethodNarrow listGetProxy = new ListMethod("__getitem__", 1) {
@Override
public PyObject __call__(PyObject key) {
return new ListIndexDelegate(asList()).checkIdxAndGetItem(key);
}
};
private static final PyBuiltinMethodNarrow listSetProxy = new ListMethod("__setitem__", 2) {
@Override
public PyObject __call__(PyObject key, PyObject value) {
new ListIndexDelegate(asList()).checkIdxAndSetItem(key, value);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listRemoveProxy = new ListMethod("__delitem__", 1) {
@Override
public PyObject __call__(PyObject key) {
new ListIndexDelegate(asList()).checkIdxAndDelItem(key);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listEqProxy = new ListMethod("__eq__", 1) {
@Override
public PyObject __call__(PyObject other) {
return isEqual(other);
}
};
private static final PyBuiltinMethodNarrow listNeProxy = new ListMethod("__ne__", 1) {
@Override
public PyObject __call__(PyObject other) {
// isEqual may return null if we don't know how to compare to other.
PyBoolean equal = isEqual(other);
if (equal != null) {
// implement NOT equal by the inverse of equal
return equal.__not__();
}
return null;
}
};
private static final PyBuiltinMethodNarrow listAppendProxy = new ListMethod("append", 1) {
@Override
public PyObject __call__(PyObject value) {
asList().add(value);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listExtendProxy = new ListMethod("extend", 1) {
@Override
public PyObject __call__(PyObject obj) {
List jList = asList();
List extension = new ArrayList();
// Extra step to build the extension list is necessary
// in case of adding to oneself
for (PyObject item : obj.asIterable()) {
extension.add(item);
}
jList.addAll(extension);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listInsertProxy = new ListMethod("insert", 2) {
@Override
public PyObject __call__(PyObject index, PyObject object) {
List jlist = asList();
ListIndexDelegate lid = new ListIndexDelegate(jlist);
int idx = lid.fixBoundIndex(index);
jlist.add(idx, object);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listPopProxy = new ListMethod("pop", 0, 1) {
@Override
public PyObject __call__() {
return __call__(Py.newInteger(-1));
}
@Override
public PyObject __call__(PyObject index) {
List jlist = asList();
if (jlist.isEmpty()) {
throw Py.IndexError("pop from empty list");
}
ListIndexDelegate ldel = new ListIndexDelegate(jlist);
PyObject item = ldel.checkIdxAndFindItem(index.asInt());
if (item == null) {
throw Py.IndexError("pop index out of range");
} else {
ldel.checkIdxAndDelItem(index);
return item;
}
}
};
private static final PyBuiltinMethodNarrow listIndexProxy = new ListMethod("index", 1, 3) {
@Override
public PyObject __call__(PyObject object) {
return __call__(object, Py.newInteger(0), Py.newInteger(asList().size()));
}
@Override
public PyObject __call__(PyObject object, PyObject start) {
return __call__(object, start, Py.newInteger(asList().size()));
}
@Override
public PyObject __call__(PyObject object, PyObject start, PyObject end) {
List jlist = asList();
ListIndexDelegate lid = new ListIndexDelegate(jlist);
int start_index = lid.fixBoundIndex(start);
int end_index = lid.fixBoundIndex(end);
int i = start_index;
try {
for (ListIterator it = jlist.listIterator(start_index); it.hasNext(); i++) {
if (i == end_index) {
break;
}
Object jobj = it.next();
if (Py.java2py(jobj)._eq(object).__nonzero__()) {
return Py.newInteger(i);
}
}
} catch (ConcurrentModificationException e) {
throw Py.ValueError(object.toString() + " is not in list");
}
throw Py.ValueError(object.toString() + " is not in list");
}
};
private static final PyBuiltinMethodNarrow listCountProxy = new ListMethod("count", 1) {
@Override
public PyObject __call__(PyObject object) {
int count = 0;
List jlist = asList();
for (int i = 0; i < jlist.size(); i++) {
Object jobj = jlist.get(i);
if (Py.java2py(jobj)._eq(object).__nonzero__()) {
++count;
}
}
return Py.newInteger(count);
}
};
private static final PyBuiltinMethodNarrow listReverseProxy = new ListMethod("reverse", 0) {
@Override
public PyObject __call__() {
List jlist = asList();
Collections.reverse(jlist);
return Py.None;
}
};
private static final PyBuiltinMethodNarrow listRemoveOverrideProxy = new ListMethod("remove", 1) {
@Override
public PyObject __call__(PyObject object) {
List jlist = asList();
for (int i = 0; i < jlist.size(); i++) {
Object jobj = jlist.get(i);
if (Py.java2py(jobj)._eq(object).__nonzero__()) {
jlist.remove(i);
return Py.None;
}
}
if (object.isIndex()) {
// this op is still O(n), but with also the extra O(n) above
ListIndexDelegate ldel = new ListIndexDelegate(jlist);
ldel.checkIdxAndDelItem(object);
return Py.None;
}
throw Py.ValueError(object.toString() + " is not in list");
}
};
private static final PyBuiltinMethodNarrow listRAddProxy = new ListMethod("__radd__", 1) {
@Override
public PyObject __call__(PyObject obj) {
// first, clone the self list
List jList = asList();
List jClone;
try {
jClone = (List) jList.getClass().getDeclaredConstructor().newInstance();
} catch (ReflectiveOperationException | SecurityException
| IllegalArgumentException e) {
throw Py.JavaError(e);
}
for (Object entry : jList) {
jClone.add(entry);
}
// then, extend it with elements from the other list
// (but, since this is reverse add, we are technically
// pre-pending the clone with elements from the other list)
if (obj instanceof Collection) {
jClone.addAll(0, (Collection) obj);
} else {
int i = 0;
for (PyObject item : obj.asIterable()) {
jClone.add(i, item);
i++;
}
}
return Py.java2py(jClone);
}
};
private static final PyBuiltinMethodNarrow listIAddProxy = new ListMethod("__iadd__", 1) {
@Override
public PyObject __call__(PyObject obj) {
List jList = asList();
if (obj instanceof Collection) {
jList.addAll((Collection) obj);
} else {
for (PyObject item : obj.asIterable()) {
jList.add(item);
}
}
return self;
}
};
private static final PyBuiltinMethodNarrow listIMulProxy = new ListMethod("__imul__", 1) {
@Override
public PyObject __call__(PyObject obj) {
List jList = asList();
int mult = obj.asInt();
// anything below 0 multiplier, we clear the list
if (mult <= 0) {
jList.clear();
} else {
try {
if (jList instanceof ArrayList) {
((ArrayList) jList).ensureCapacity(jList.size() * (mult - 1));
}
// otherwise, extend it (in-place) x times, where x is int-cast from obj
int originalSize = jList.size();
for (mult = mult - 1; mult > 0; mult--) {
for (int i = 0; i < originalSize; i++) {
jList.add(jList.get(i));
}
}
} catch (OutOfMemoryError t) {
throw Py.MemoryError("");
}
}
return self;
}
};
private static final PyBuiltinMethodNarrow listSortProxy = new ListMethod("sort", 0, 3) {
@Override
public PyObject __call__() {
list_sort(asList(), Py.None, Py.None, false);
return Py.None;
}
@Override
public PyObject __call__(PyObject cmp) {
list_sort(asList(), cmp, Py.None, false);
return Py.None;
}
@Override
public PyObject __call__(PyObject cmp, PyObject key) {
list_sort(asList(), cmp, key, false);
return Py.None;
}
@Override
public PyObject __call__(PyObject cmp, PyObject key, PyObject reverse) {
list_sort(asList(), cmp, key, reverse.__nonzero__());
return Py.None;
}
@Override
public PyObject __call__(PyObject[] args, String[] kwds) {
ArgParser ap = new ArgParser("list", args, kwds, new String[]{
"cmp", "key", "reverse"}, 0);
PyObject cmp = ap.getPyObject(0, Py.None);
PyObject key = ap.getPyObject(1, Py.None);
PyObject reverse = ap.getPyObject(2, Py.False);
list_sort(asList(), cmp, key, reverse.__nonzero__());
return Py.None;
}
};
static PyBuiltinMethod[] getProxyMethods() {
return new PyBuiltinMethod[]{
listGetProxy,
listSetProxy,
listEqProxy,
listNeProxy,
listRemoveProxy,
listAppendProxy,
listExtendProxy,
listInsertProxy,
listPopProxy,
listIndexProxy,
listCountProxy,
listReverseProxy,
listRAddProxy,
listIAddProxy,
new ListMulProxyClass("__mul__", 1),
new ListMulProxyClass("__rmul__", 1),
listIMulProxy
};
}
static PyBuiltinMethod[] getPostProxyMethods() {
return new PyBuiltinMethod[]{
listSortProxy,
listRemoveOverrideProxy
};
}
}