Fix increment and decrement operators

These operators have semantics that are different from
(foo + 1), as they always convert the LHS to a number first.

Change-Id: I3fb4a1a328e3dfcb334875435c3cec90d01b67dd
Reviewed-by: Erik Verbruggen <erik.verbruggen@digia.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/qmljs_runtime.cpp b/qmljs_runtime.cpp
index 25a3c11ec0..5ef2c6c9f0 100644
--- a/qmljs_runtime.cpp
+++ b/qmljs_runtime.cpp
@@ -873,6 +873,28 @@ void __qmljs_builtin_declare_var(ExecutionContext *ctx, bool deletable, String *
     ctx->createMutableBinding(name, deletable);
 }
 
+Value __qmljs_increment(Value value, ExecutionContext *ctx)
+{
+    TRACE1(value);
+
+    if (value.isInteger())
+        return Value::fromInt32(value.integerValue() + 1);
+
+    double d = __qmljs_to_number(value, ctx);
+    return Value::fromDouble(d + 1);
+}
+
+Value __qmljs_decrement(Value value, ExecutionContext *ctx)
+{
+    TRACE1(value);
+
+    if (value.isInteger())
+        return Value::fromInt32(value.integerValue() - 1);
+
+    double d = __qmljs_to_number(value, ctx);
+    return Value::fromDouble(d - 1);
+}
+
 } // extern "C"