Add some ECMAScript 6 Number and Math methods and properties

This adds the Number.EPSILON property, the Number.isFinite, Number.isNaN,
and Math.sign methods introduced in ECMAScript 6.

Change-Id: Ib16408a63c202a4ef30a14334f65ac3a1a13cfaf
Reviewed-by: Michael Brasser <michael.brasser@live.com>
Reviewed-by: Lars Knoll <lars.knoll@theqtcompany.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4mathobject.cpp b/src/qml/jsruntime/qv4mathobject.cpp
index 4a304b6138..df1c8c6049 100644
--- a/src/qml/jsruntime/qv4mathobject.cpp
+++ b/src/qml/jsruntime/qv4mathobject.cpp
@@ -80,6 +80,7 @@ Heap::MathObject::MathObject()
     m->defineDefaultProperty(QStringLiteral("pow"), QV4::MathObject::method_pow, 2);
     m->defineDefaultProperty(QStringLiteral("random"), QV4::MathObject::method_random, 0);
     m->defineDefaultProperty(QStringLiteral("round"), QV4::MathObject::method_round, 1);
+    m->defineDefaultProperty(QStringLiteral("sign"), QV4::MathObject::method_sign, 1);
     m->defineDefaultProperty(QStringLiteral("sin"), QV4::MathObject::method_sin, 1);
     m->defineDefaultProperty(QStringLiteral("sqrt"), QV4::MathObject::method_sqrt, 1);
     m->defineDefaultProperty(QStringLiteral("tan"), QV4::MathObject::method_tan, 1);
@@ -299,6 +300,19 @@ ReturnedValue MathObject::method_round(CallContext *context)
     return Encode(v);
 }
 
+ReturnedValue MathObject::method_sign(CallContext *context)
+{
+    double v = context->argc() ? context->args()[0].toNumber() : qt_qnan();
+
+    if (std::isnan(v))
+        return Encode(qt_qnan());
+
+    if (qIsNull(v))
+        return v;
+
+    return Encode(std::signbit(v) ? -1 : 1);
+}
+
 ReturnedValue MathObject::method_sin(CallContext *context)
 {
     double v = context->argc() ? context->args()[0].toNumber() : qt_qnan();