Handle<Value> Expression::toString(const Arguments& args)
{
HandleScope scope;
Expression* e = node::ObjectWrap::Unwrap<Expression>(args.This());
return scope.Close(String::New( mapnik::to_expression_string(*e->get()).c_str() ));
}
Handle<Value> Expression::evaluate(const Arguments& args)
{
HandleScope scope;
if (args.Length() < 1) {
return ThrowException(Exception::Error(
String::New("requires a mapnik.Feature as an argument")));
}
Local<Object> obj = args[0]->ToObject();
if (obj->IsNull() || obj->IsUndefined()) {
return ThrowException(Exception::TypeError(String::New("first argument is invalid, must be a mapnik.Feature not null/undefined")));
}
if (!Feature::constructor->HasInstance(obj)) {
return ThrowException(Exception::TypeError(String::New("first argument is invalid, must be a mapnik.Feature")));
}
Feature* f = node::ObjectWrap::Unwrap<Feature>(obj);
Expression* e = node::ObjectWrap::Unwrap<Expression>(args.This());
mapnik::value value_obj = boost::apply_visitor(mapnik::evaluate<mapnik::Feature,mapnik::value>(*(f->get())),*(e->get()));
return scope.Close(boost::apply_visitor(node_mapnik::value_converter(),value_obj.base()));
}
