Partial implementation of the JSON module.

modules/json/JValue.hpp

@@ -0,0 +1,257 @@
+#ifndef _SQJSON_JVALUE_HPP_
+#define _SQJSON_JVALUE_HPP_
+
+// ------------------------------------------------------------------------------------------------
+#include "Common.hpp"
+
+// ------------------------------------------------------------------------------------------------
+namespace SqMod {
+
+/* ------------------------------------------------------------------------------------------------
+ * Allows management and interaction with a JSON value.
+*/
+class JValue
+{
+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 value instance.
+
+    // --------------------------------------------------------------------------------------------
+    static std::size_t s_Flags; // Global flags used when dumping to a string.
+
+public:
+
+    /* --------------------------------------------------------------------------------------------
+     * Default constructor. (null)
+    */
+    JValue()
+        : m_Ptr(json_null())
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Pointer constructor.
+    */
+    JValue(Pointer ptr)
+        : m_Ptr(json_incref(ptr))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Pointer constructor.
+    */
+    JValue(Pointer ptr, bool inc)
+        : m_Ptr(inc ? json_incref(ptr) : ptr)
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Null pointer constructor.
+    */
+    JValue(std::nullptr_t)
+        : m_Ptr(json_null())
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Boolean constructor.
+    */
+    JValue(bool val)
+        : m_Ptr(json_boolean(val))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * String constructor.
+    */
+    JValue(CSStr val, bool check = true)
+        : m_Ptr(check ? json_string(val) : json_string_nocheck(val))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * String constructor.
+    */
+    JValue(CSStr val, std::size_t len, bool check = true)
+        : m_Ptr(check ? json_stringn(val, len) : json_stringn_nocheck(val,len))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * 32 bit signed integer constructor.
+    */
+    JValue(Int32 val)
+        : m_Ptr(json_integer(ConvTo< json_int_t >::From(val)))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * 64 bit signed integer constructor.
+    */
+    JValue(Int64 val)
+        : m_Ptr(json_integer(ConvTo< json_int_t >::From(val)))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * 32 bit floating point number constructor.
+    */
+    JValue(Float32 val)
+        : m_Ptr(json_real(val))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * 64 bit floating point number constructor.
+    */
+    JValue(Float64 val)
+        : m_Ptr(json_real(val))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Copy constructor.
+    */
+    JValue(const JValue & o)
+        : m_Ptr(json_incref(o.m_Ptr))
+    {
+        /* ... */
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Move constructor.
+    */
+    JValue(JValue && o)
+        : m_Ptr(o.m_Ptr)
+    {
+        // Prevent further interaction
+        o.m_Ptr = nullptr;
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Destructor.
+    */
+    ~JValue()
+    {
+        // Decrease the reference count of the managed value
+        json_decref(m_Ptr);
+    }
+
+    /* --------------------------------------------------------------------------------------------
+     * Copy assignment operator.
+    */
+    JValue & operator = (const JValue & 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.
+    */
+    JValue & operator = (JValue && 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 JValue & 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_JVALUE_HPP_