1 files changed, 151 insertions, 0 deletions
diff --git a/host/lib/wax.cpp b/host/lib/wax.cpp
new file mode 100644
index 000000000..5f658acd8
--- /dev/null
+++ b/host/lib/wax.cpp
@@ -0,0 +1,151 @@
+//
+// Copyright 2010-2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/wax.hpp>
+#include <uhd/exception.hpp>
+#include <boost/format.hpp>
+#include <stdexcept>
+
+/*!
+ * The link args for internal use within this cpp file:
+ *
+ * It contains a link (in this case a pointer) to a wax object.
+ * Only the methods in this file may create or parse link args.
+ * The get_link method is the creator of a link args object.
+ * The [] operator will resolve the link and make the [] call.
+ *
+ * TODO: register the link args with the wax obj that it links to.
+ * That way, if the obj destructs, the link can be invalidated.
+ * The operator() will throw, rather than dereferencing bad memory.
+ */
+class link_args_t{
+public:
+    link_args_t(const wax::obj *obj_ptr) : _obj_ptr(obj_ptr){
+        /* NOP */
+    }
+    wax::obj & operator()(void) const{
+        //recursively resolve link args to get at original pointer
+        if (_obj_ptr->type() == typeid(link_args_t)){
+            return _obj_ptr->as<link_args_t>()();
+        }
+        return *const_cast<wax::obj *>(_obj_ptr);
+    }
+private:
+    const wax::obj *_obj_ptr;
+};
+
+/*!
+ * The proxy args for internal use within this cpp file:
+ *
+ * It contains a link and a key for setting/getting a property.
+ * Only the methods in this file may create or parse proxy args.
+ * Class methods have special handling for the case when the
+ * wax obj contains an instance of the proxy args.
+ */
+class proxy_args_t{
+public:
+    proxy_args_t(const wax::obj *obj_ptr, const wax::obj &key) : _key(key){
+        _obj_link = obj_ptr->get_link();
+    }
+    wax::obj & operator()(void) const{
+        return _obj_link.as<link_args_t>()();
+    }
+    const wax::obj & key(void) const{
+        return _key;
+    }
+private:
+    wax::obj _obj_link;
+    const wax::obj _key;
+};
+
+/***********************************************************************
+ * Structors
+ **********************************************************************/
+wax::obj::obj(void){
+    /* NOP */
+}
+
+wax::obj::obj(const obj &o){
+    _contents = o._contents;
+}
+
+wax::obj::~obj(void){
+    /* NOP */
+}
+
+/***********************************************************************
+ * Special Operators
+ **********************************************************************/
+wax::obj wax::obj::operator[](const obj &key){
+    if (_contents.type() == typeid(proxy_args_t)){
+        obj val = resolve();
+        //check if its a special link and call
+        if (val.type() == typeid(link_args_t)){
+            return val.as<link_args_t>()()[key];
+        }
+        //unknown obj
+        throw uhd::type_error("cannot use [] on non wax::obj link");
+    }
+    else{
+        return proxy_args_t(this, key);
+    }
+}
+
+wax::obj & wax::obj::operator=(const obj &val){
+    if (_contents.type() == typeid(proxy_args_t)){
+        proxy_args_t proxy_args = boost::any_cast<proxy_args_t>(_contents);
+        proxy_args().set(proxy_args.key(), val);
+    }
+    else{
+        _contents = val._contents;
+    }
+    return *this;
+}
+
+/***********************************************************************
+ * Public Methods
+ **********************************************************************/
+wax::obj wax::obj::get_link(void) const{
+    return link_args_t(this);
+}
+
+const std::type_info & wax::obj::type(void) const{
+    return resolve().type();
+}
+
+/***********************************************************************
+ * Private Methods
+ **********************************************************************/
+boost::any wax::obj::resolve(void) const{
+    if (_contents.type() == typeid(proxy_args_t)){
+        obj val;
+        proxy_args_t proxy_args = boost::any_cast<proxy_args_t>(_contents);
+        proxy_args().get(proxy_args.key(), val);
+        return val.resolve();
+    }
+    else{
+        return _contents;
+    }
+}
+
+void wax::obj::get(const obj &, obj &){
+    throw uhd::type_error("Cannot call get on wax obj base class");
+}
+
+void wax::obj::set(const obj &, const obj &){
+    throw uhd::type_error("Cannot call set on wax obj base class");
+}