Purpose

The purpose of modularity is double:

• First, it gives you the ability to divide a problem in smaller, more manageable sub-problems, thereby enabling you to cope with more complex source code analysis needs.
• Then, it also allows you to define reusable building blocks that you can then reuse to build more sophisticated scripts. Your RainCode distribution includes several of such library modules.

A reusable module is defined by a MODULE clause in the header, as in:

MODULE MyUtils;

  PROCEDURE MultStr(What, By);
    BEGIN
    RESULT := "";
    FOR i := 1 TO By DO
      RESULT := RESULT & What;
      END;
    END MultStr;

Then, one can use the facilities provided by this module by means of a USE clause:

USE MyUtils;

PROCEDURE INIT;
  BEGIN
  OUT.WriteLn (MyUtils.MultStr ("Hello !", 5));
  END INIT;

The clause USE MyUtils defines a read-only variable named ``MyUtils'', and the procedures, variables and constants defined in the MyUtils module can be used by using the connection operator (``.'').