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Command Argument Indirection

1977 Version of ANSI Standard

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3.5.8 Command Argument Indirection

Indirection is available for evaluation of either individual command arguments or contiguous sublists of command arguments. The opportunities for indirection are shown in the syntax definitions accompanying the command descriptions.

Typically, where a command word carries an argument list, as in

COMMANDWORD Space L argument

the argument syntax will be expressed as

    argument::= │
│
│		 individual argument syntax
@ expratom V L argument		 │
│
│

See also the transition diagram for argument.

This formulation expresses the following properties of argument indirection.

  1. Argument indirection may be used recursively.
  2. A single instance of argument indirection may evaluate to one complete argument or to a sublist of complete arguments.

Unless the opposite is explicitly stated, the text of each command specification describes the arguments after all indirection has been evaluated.

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Copyright © Standard Documents; 1977-2024 MUMPS Development Committee;
Copyright © Examples: 1995-2024 Ed de Moel;
Copyright © Annotations: 2003-2008 Jacquard Systems Research
Copyright © Annotations: 2008-2024 Ed de Moel.

This page most recently updated on 14-Nov-2023, 21:35:19.

For comments, contact Ed de Moel (demoel@jacquardsystems.com)