This function goes over the source lines and performs the syntax analysis. This function calls the function ex_Command_r(). When that function returns it allocated the list nodes that chain up the individual lines. It also defines the labels that are waiting to be defined.
int ex_Command_l(peXobject pEx,
When all the lines are done this function cleans the name space stack,
check for undefined labels that remained undefined still the end
of the source file.