Lexical Elements of the DEC Text Processing Utility Language 4.9 Reserved Words

•If an error or warning is generated during a CALL_USER routine, ERROR is set to a keyword that represents the failure status of the routine, ERROR_ LINE is set to the line number of the error, and ERROR_TEXT is set to

a warning or error message that is placed in the message buffer. Finally, DECTPU runs the error handler code.

•For other warnings and errors, ERROR is set to a keyword that represents the error or warning, ERROR_LINE is set to the line number of the error, and ERROR_TEXT is set to the error or warning message associated with the keyword. DECTPU places error messages in the message buffer but suppresses the display of warning messages. Finally, DECTPU runs the error handler code.

If an error or warning is generated during execution of a procedural error handler, DECTPU behaves as follows:

•If you press Ctrl/C during the error handler, DECTPU puts an error message in the message buffer, exits from all currently active procedures (in their reverse calling order), and returns to the ‘‘wait for next key’’ loop.

•For other errors and warnings, the appropriate error or warning message is written to the message buffer. DECTPU resumes execution at the next statement after the statement that generated the error.

4.9.4.16Case-Style Error Handlers

Case-style error handlers provide a number of advantages over procedural error handlers. With case-style error handlers, you can do the following:

•Suppress the automatic display of both warning and error status messages

•Trap the TPU$_CONTROLC status

•Write clearer code

Syntax

ON_ERROR [condition_1]: statement_1;... [condition_2]: statement_2;... . . .

[condition_n]: statement_n; ENDON_ERROR;

You can use the [OTHERWISE] selector alone in an error handler as a shortcut. For example, the following two error handlers have the same effect:

! This error handler uses [OTHERWISE] alone as a shortcut.

ON_ERROR [OTHERWISE] : ;

ENDON_ERROR

!This error handler has the same effect as using

![OTHERWISE] alone.

ON_ERROR [OTHERWISE] :

LEARN_ABORT; RETURN (FALSE);

ENDON_ERROR;

Example 4–11 from the EVE editor shows a procedure with a case-style error handler.

Lexical Elements of the DEC Text Processing Utility Language 4–25

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Compaq AA-PWCBD-TE manual Case-Style Error Handlers
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AA-PWCBD-TE specifications

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