GOTO & LABEL

"If you want to go somewhere, goto is the best way to get there." -- Ken Thompson

The GOTO statement performs a one-way transfer of control to a line of code marked by a LABEL statement. In lame man terms, the execution jumps to the line where the wanted LABEL is found and continues from there.

While maligned by Edsger W. Dijkstra and his cohorts, GOTO is very useful in many situations. Its reputation is undeserved and mostly perpetuated by people that don't understand the origins of the criticism or how the statement can be used.

You also can't make a COBOLesque language without GOTO, so (due to popular request) here we've added it to the language.

Syntax:

LABEL <labelName>
GOTO <labelName>

Label names follow the naming rules stated here.

Example:

PROCEDURE:
GOTO start
LABEL start
display "> starting..." crlf
GOTO ending
LABEL middle
display "> entering the middle section..." crlf
sub-procedure cool-code
GOTO cool
display "hmm... is this cool?" crlf
LABEL cool
display "wow, yeah! cool code!" crlf
end sub-procedure
LABEL ending
CALL cool-code
display "> that's the end" crlf

In the output of this program you can see the middle LABEL and the start of the cool-code SUB-PROCEDURE are skipped:

> starting...
wow, yeah! cool code!
> that's the end

In order to keep GOTO from turning your source into "unmaintainable spaghetti code", both your GOTO statement and the LABEL it jumps to have to be used together in the same sub-procedure or in the main code body of an LDPL program. So you can't goto across sub-procedures or into them, or anything like that.