Programmer Guide/Command Reference/GOTO: Difference between revisions
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{{Command Reference}} | {{Command Reference}} | ||
GOTO <var>label</var> [<var>fallback_label</var>] | GOTO <var>label</var> [<var>fallback_label</var>] | ||
Continue macro execution at the [[Programmer Guide/Source_code#labels|label]] <var>label</var>. With the argument <var>fallback_label</var> a second label can be specified which is used as the target should the primary target, <code>label</code>, be undefined. | Continue macro execution at the [[Programmer Guide/Source_code#labels|label]] <var>label</var>. With the argument <var>fallback_label</var> a second label can be specified which is used as the target should the primary target, <code>label</code>, be undefined. This feature is unique to the {{STX}} programming language. | ||
Often, the <code>GOTO</code> command is used with a variable label to implement a <code>switch</code>-like control structure. In this case, <var>fallback_label</var> has the role of the <code>default</code> switch clause. | Often, the <code>GOTO</code> command is used with a variable label to implement a <code>switch</code>-like control structure. In this case, <var>fallback_label</var> has the role of the <code>default</code> switch clause. | ||
Latest revision as of 08:40, 1 June 2015
GOTO label [fallback_label]
Continue macro execution at the label label. With the argument fallback_label a second label can be specified which is used as the target should the primary target, label, be undefined. This feature is unique to the STx programming language.
Often, the GOTO command is used with a variable label to implement a switch-like control structure. In this case, fallback_label has the role of the default switch clause.
If both label, and default_label, are undefined, an error is generated and macro execution terminates.
