Add the start of a Map from ES7

Like Set, for the time being, this is baseed on top of ArrayObject: two
of them, one for keys, one for values. Again, this goes against the
spirit of the spec (which requires nonlinear access), but having the API
present is at least a start, and the implementation is easily changed.

Change-Id: Idcf0ad8d92eb5daac734d52e8e2dd4c8e0dd5109
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 109 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4mapiterator.cpp b/src/qml/jsruntime/qv4mapiterator.cpp
new file mode 100644
index 0000000000..74b0dda791
--- /dev/null
+++ b/src/qml/jsruntime/qv4mapiterator.cpp
@@ -0,0 +1,109 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 Crimson AS <info@crimson.no>
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtQml module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or (at your option) the GNU General
+** Public license version 3 or any later version approved by the KDE Free
+** Qt Foundation. The licenses are as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-2.0.html and
+** https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <private/qv4iterator_p.h>
+#include <private/qv4mapiterator_p.h>
+#include <private/qv4mapobject_p.h>
+#include <private/qv4symbol_p.h>
+
+using namespace QV4;
+
+DEFINE_OBJECT_VTABLE(MapIteratorObject);
+
+void MapIteratorPrototype::init(ExecutionEngine *e)
+{
+    defineDefaultProperty(QStringLiteral("next"), method_next, 0);
+
+    Scope scope(e);
+    ScopedString val(scope, e->newString(QLatin1String("Map Iterator")));
+    defineReadonlyConfigurableProperty(e->symbol_toStringTag(), val);
+}
+
+ReturnedValue MapIteratorPrototype::method_next(const FunctionObject *b, const Value *that, const Value *, int)
+{
+    Scope scope(b);
+    const MapIteratorObject *thisObject = that->as<MapIteratorObject>();
+    if (!thisObject)
+        return scope.engine->throwTypeError(QLatin1String("Not a Map Iterator instance"));
+
+    Scoped<MapObject> s(scope, thisObject->d()->iteratedMap);
+    quint32 index = thisObject->d()->mapNextIndex;
+    IteratorKind itemKind = thisObject->d()->iterationKind;
+
+    if (!s) {
+        QV4::Value undefined = Primitive::undefinedValue();
+        return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
+    }
+
+    Scoped<ArrayObject> keys(scope, s->d()->mapKeys);
+    Scoped<ArrayObject> values(scope, s->d()->mapValues);
+
+    while (index < keys->getLength()) {
+        ScopedValue sk(scope, keys->getIndexed(index));
+        ScopedValue sv(scope, values->getIndexed(index));
+        index += 1;
+        thisObject->d()->mapNextIndex = index;
+
+        ScopedValue result(scope);
+
+        if (itemKind == KeyIteratorKind) {
+            result = sk;
+        } else if (itemKind == ValueIteratorKind) {
+            result = sv;
+        } else {
+            Q_ASSERT(itemKind == KeyValueIteratorKind);
+
+            result = scope.engine->newArrayObject();
+
+            Scoped<ArrayObject> resultArray(scope, result);
+            resultArray->arrayReserve(2);
+            resultArray->arrayPut(0, sk);
+            resultArray->arrayPut(1, sv);
+            resultArray->setArrayLengthUnchecked(2);
+        }
+
+        return IteratorPrototype::createIterResultObject(scope.engine, result, false);
+    }
+
+    thisObject->d()->iteratedMap.set(scope.engine, nullptr);
+    QV4::Value undefined = Primitive::undefinedValue();
+    return IteratorPrototype::createIterResultObject(scope.engine, undefined, true);
+}
+
+