Partial implementation of the JSON module.

modules/json/JObject.hpp

@@ -0,0 +1,201 @@
+#ifndef _SQJSON_JOBJECT_HPP_
+#define _SQJSON_JOBJECT_HPP_
+
+// ------------------------------------------------------------------------------------------------
+#include "Common.hpp"
+
+// ------------------------------------------------------------------------------------------------
+namespace SqMod {
+
+/* ------------------------------------------------------------------------------------------------
+ * Allows management and interaction with a JSON object.
+*/
+class JObject
+{
+public:
+
+    // --------------------------------------------------------------------------------------------
+    typedef json_t          Type; // The managed type.
+
+    // --------------------------------------------------------------------------------------------
+    typedef Type*           Pointer; // Pointer to the managed type.
+    typedef const Type*     ConstPtr; // Constant pointer to the managed type.
+
+    // --------------------------------------------------------------------------------------------
+    typedef Type&           Reference; // Reference to the managed type.
+    typedef const Type&     ConstRef; // Constant reference to the managed type.
+
+private:
+
+    // --------------------------------------------------------------------------------------------
+    Pointer m_Ptr; // Pointer to the managed object instance.
+
+    // --------------------------------------------------------------------------------------------
+    static std::size_t s_Flags; // Global flags used when dumping to a string.
+
+public:
+
+    /* --------------------------------------------------------------------------------------------
+     * Default constructor. (empty)
+    */
+    JObject()
+        : m_Ptr(json_object())
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Pointer constructor.
+    */
+    JObject(Pointer ptr)
+        : m_Ptr(ptr)
+    {
+        if (json_is_object(m_Ptr))
+        {
+            json_incref(m_Ptr);
+        }
+        else
+        {
+            STHROWF("Expected JSON object got: %s", JSONTypeStr(m_Ptr));
+        }
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Pointer constructor.
+    */
+    JObject(Pointer ptr, bool inc)
+        : m_Ptr(ptr)
+    {
+        if (json_is_object(m_Ptr))
+        {
+            if (inc)
+            {
+                json_incref(m_Ptr);
+            }
+        }
+        else
+        {
+            STHROWF("Expected JSON object got: %s", JSONTypeStr(m_Ptr));
+        }
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Copy constructor.
+    */
+    JObject(const JObject & o)
+        : m_Ptr(json_incref(o.m_Ptr))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Move constructor.
+    */
+    JObject(JObject && o)
+        : m_Ptr(o.m_Ptr)
+    {
+        // Prevent further interaction
+        o.m_Ptr = nullptr;
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Destructor.
+    */
+    ~JObject()
+    {
+        // Release the managed object
+        json_decref(m_Ptr);
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Copy assignment operator.
+    */
+    JObject & operator = (const JObject & o)
+    {
+        // Avoid self assignment
+        if (m_Ptr != o.m_Ptr)
+        {
+            // Release the current object
+            json_decref(m_Ptr);
+            // Grab the reference of the new object
+            m_Ptr = json_incref(o.m_Ptr);
+        }
+        return *this;
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Move assignment operator.
+    */
+    JObject & operator = (JObject && o)
+    {
+        // Avoid self assignment
+        if (m_Ptr != o.m_Ptr)
+        {
+            // Release the current object
+            json_decref(m_Ptr);
+            // Steal reference
+            m_Ptr = o.m_Ptr;
+            // Prevent further interaction
+            o.m_Ptr = nullptr;
+        }
+        return *this;
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Used by the script engine to compare two instances of this type.
+    */
+    Int32 Cmp(const JObject & o) const
+    {
+        if (json_equal(m_Ptr, o.m_Ptr))
+        {
+            return 0;
+        }
+        else if (m_Ptr > o.m_Ptr)
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Used by the script engine to convert an instance of this type to a string.
+    */
+    Object ToString() const;
+
+    /* --------------------------------------------------------------------------------------------
+     * Used by the script engine to retrieve the name from instances of this type.
+    */
+    static SQInteger Typename(HSQUIRRELVM vm);
+
+    /* --------------------------------------------------------------------------------------------
+     * Implicit conversion to the managed JSON value.
+    */
+    operator Pointer ()
+    {
+        return m_Ptr;
+    }    
+
+    /* --------------------------------------------------------------------------------------------
+     * Implicit conversion to the managed JSON value.
+    */
+    operator ConstPtr () const
+    {
+        return m_Ptr;
+    }    
+
+    /* --------------------------------------------------------------------------------------------
+     * See whether the managed value is valid.
+    */
+    bool IsValid() const
+    {
+        return (m_Ptr != nullptr);
+    }
+
+};
+
+} // Namespace:: SqMod
+
+#endif // _SQJSON_JOBJECT_HPP_