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, 23 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4numberobject.cpp b/src/qml/jsruntime/qv4numberobject.cpp
index ab3e03b183..f6b3e9a2b3 100644
--- a/src/qml/jsruntime/qv4numberobject.cpp
+++ b/src/qml/jsruntime/qv4numberobject.cpp
@@ -45,6 +45,7 @@
 #include <QtCore/qmath.h>
 #include <QtCore/QDebug>
 #include <cassert>
+#include <limits>
 
 using namespace QV4;
 
@@ -99,12 +100,16 @@ void NumberPrototype::init(ExecutionEngine *engine, Object *ctor)
     ctor->defineReadonlyProperty(QStringLiteral("NEGATIVE_INFINITY"), Primitive::fromDouble(-qInf()));
     ctor->defineReadonlyProperty(QStringLiteral("POSITIVE_INFINITY"), Primitive::fromDouble(qInf()));
     ctor->defineReadonlyProperty(QStringLiteral("MAX_VALUE"), Primitive::fromDouble(1.7976931348623158e+308));
+    ctor->defineReadonlyProperty(QStringLiteral("EPSILON"), Primitive::fromDouble(std::numeric_limits<double>::epsilon()));
 
 QT_WARNING_PUSH
 QT_WARNING_DISABLE_INTEL(239)
     ctor->defineReadonlyProperty(QStringLiteral("MIN_VALUE"), Primitive::fromDouble(5e-324));
 QT_WARNING_POP
 
+    ctor->defineDefaultProperty(QStringLiteral("isFinite"), method_isFinite, 1);
+    ctor->defineDefaultProperty(QStringLiteral("isNaN"), method_isNaN, 1);
+
     defineDefaultProperty(QStringLiteral("constructor"), (o = ctor));
     defineDefaultProperty(engine->id_toString(), method_toString);
     defineDefaultProperty(QStringLiteral("toLocaleString"), method_toLocaleString);
@@ -134,6 +139,24 @@ inline double thisNumber(ExecutionContext *ctx)
     return n->value();
 }
 
+ReturnedValue NumberPrototype::method_isFinite(CallContext *ctx)
+{
+    if (!ctx->argc())
+        return Encode(false);
+
+    double v = ctx->args()[0].toNumber();
+    return Encode(!std::isnan(v) && !qt_is_inf(v));
+}
+
+ReturnedValue NumberPrototype::method_isNaN(CallContext *ctx)
+{
+    if (!ctx->argc())
+        return Encode(false);
+
+    double v = ctx->args()[0].toNumber();
+    return Encode(std::isnan(v));
+}
+
 ReturnedValue NumberPrototype::method_toString(CallContext *ctx)
 {
     Scope scope(ctx);