qv4arrayobject: Implement Array.prototype.includes from ES7

We also add a sameValueZero helper, to make life easier.

Remaining failures:
 built-ins/Array/prototype/includes/get-prop.js fails (due to missing Proxy)
 built-ins/Array/prototype/includes/length-boundaries.js fails

length-boundaries failure is due to strange treatment of edge number values in
Value, I think, I haven't yet been able to rectify that one.

Change-Id: Idacca528d88fb052d19a5d244662927f502f20d2
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4value.cpp b/src/qml/jsruntime/qv4value.cpp
index a18dffac1e..85b4297dd6 100644
--- a/src/qml/jsruntime/qv4value.cpp
+++ b/src/qml/jsruntime/qv4value.cpp
@@ -246,6 +246,20 @@ bool Value::sameValue(Value other) const {
     return false;
 }
 
+bool Value::sameValueZero(Value other) const {
+    if (_val == other._val)
+        return true;
+    String *s = stringValue();
+    String *os = other.stringValue();
+    if (s && os)
+        return s->isEqualTo(os);
+    if (isInteger() && other.isDouble())
+        return double(int_32()) == other.doubleValue();
+    if (isDouble() && other.isInteger())
+        return other.int_32() == doubleValue();
+    return false;
+}
+
 #ifndef V4_BOOTSTRAP
 Heap::String *Value::toString(ExecutionEngine *e, Value val)
 {