Implement gradle spec reader/writer

logic/DefaultVariable.h

@@ -0,0 +1,35 @@
+#pragma once
+
+template <typename T>
+class DefaultVariable
+{
+public:
+	DefaultVariable(const T & value)
+	{
+		defaultValue = value;
+	}
+	DefaultVariable<T> & operator =(const T & value)
+	{
+		currentValue = value;
+		is_default = currentValue == defaultValue;
+		is_explicit = true;
+		return *this;
+	}
+	operator const T &() const
+	{
+		return is_default ? defaultValue : currentValue;
+	}
+	bool isDefault() const
+	{
+		return is_default;
+	}
+	bool isExplicit() const
+	{
+		return is_explicit;
+	}
+private:
+	T currentValue;
+	T defaultValue;
+	bool is_default = true;
+	bool is_explicit = false;
+};