/// <summary>
/// Checks if a variable object is a reference to a variable registered in the AinFile, and returns the original variable from the AinFile if it exists, otherwise returns null.
/// </summary>
/// <param name="variable">The variable to find</param>
/// <param name="ainFile">The AinFile to find the variable in.</param>
/// <returns>returns the original variable from the AinFile if it exists, otherwise returns null</returns>
public static IVariable Canonicalize(this IVariable variable, AinFile ainFile)
{
int index = variable.Index;
int parentIndex = -1;
if (variable == null || ainFile == null)
{
return(null);
}
var root = variable.Root;
var parent = variable.Parent;
if (parent != null)
{
parentIndex = parent.Index;
}
if (root == ainFile || root == null)
{
if (parent is Function)
{
if (parent.Name.StartsWith("system."))
{
return(AinFile.GetSystemCallParameter(parentIndex, index));
}
return(ainFile.GetFunctionParameter(parentIndex, index));
}
if (parent is Struct)
{
return(ainFile.GetStructMember(parentIndex, index));
}
if (variable is Global)
{
return(ainFile.GetGlobal(index));
}
if (parent is FunctionType)
{
return(ainFile.GetFuncTypeParameter(parentIndex, index));
}
if (parent is HllFunction)
{
if (parent.Parent != null)
{
return(ainFile.GetLibraryFunctionParameter(parent.Parent.Index, parentIndex, index));
}
else
{
return(null);
}
}
if (variable is Function)
{
if (variable.Name.StartsWith("system."))
{
return(AinFile.GetSystemCall(index));
}
return(ainFile.GetFunction(index));
}
if (variable is Struct)
{
return(ainFile.GetStruct(index));
}
if (variable is HllFunction)
{
return(ainFile.GetLibraryFunction(parentIndex, index));
}
if (variable is FunctionType)
{
return(ainFile.GetFuncType(index));
}
}
else
{
if (parent is Function)
{
if (parent.Name.StartsWith("system."))
{
return(AinFile.GetSystemCallParameter(parentIndex, index));
}
return(ainFile.GetFunctionParameter(parent.Name, variable.Name));
}
if (variable is Global)
{
return(ainFile.GetGlobal(variable.Name));
}
if (parent is Struct)
{
return(ainFile.GetStructMember(parent.Name, variable.Name));
}
if (parent is FunctionType)
{
return(ainFile.GetFuncTypeParameter(parent.Name, variable.Index));
}
if (parent is HllFunction)
{
if (parent.Parent != null)
{
return(ainFile.GetLibraryFunctionParameter(parent.Parent.Name, parent.Name, index));
}
else
{
return(null);
}
}
if (variable is Function)
{
if (variable.Name.StartsWith("system."))
{
return(AinFile.GetSystemCall(index));
}
return(ainFile.GetFunction(variable.Name));
}
if (variable is Struct)
{
return(ainFile.GetStruct(variable.Name));
}
if (variable is HllFunction)
{
return(ainFile.GetLibraryFunction(parent.Name, variable.Name));
}
if (variable is FunctionType)
{
return(ainFile.GetFuncType(variable.Name));
}
}
return(null);
}