Level 4 Features

The theme of Level 4 is “control static semantics of BabyCobol Links to an external site.”, so focus mostly on:

• handling language semantics (behaviour, usually opposing/complementing the syntax) in the control flow related features
• handling interplay of different features handling the control flow
• watching the topic L4P1 can also be helpful.

Features:

• (4XP): COPY Links to an external site.
  • Implement the file inclusion directive of BabyCobol, including the REPLACING clause.
• (4XP): GO TO Links to an external site.
  • Implement the “normal” GO TO statement of BabyCobol, with the statically resolvable paragraph name as the argument.
  • GO TO terminates all currently executing LOOP statements
  • GO TO terminates the currently executing PERFORM THROUGH directive if its target is outside of the executing scope
    • see a special example plogram Links to an external site.
• (4XP): PERFORM THROUGH Links to an external site.
  • Add the THROUGH clause to the PERFORM statement implemented at Level 1