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

If this code is included in TEMP.TPU, the following command demonstrates the scope of the various local variables:

$

EDIT/TPU/NOSECTION/NOINITIALIZE/NODISPLAY/COMMAND=temp.tpu

Starting or ending the unbound, non-init code

Starting or ending the module init code

Within procedure bat, within module mmm

Starting or ending the module init code

Within procedure bat, within module mmm

In procedure bar, which is outside all modules

Starting or ending the unbound, non-init code

4.9.5.3 CONSTANT

With the CONSTANT declaration, you can associate a name with certain constant expressions. The constant expression must evaluate at compile time to a keyword, a string, an integer, or an unspecified constant value. The maximum length of a string constant allowed in a constant declaration is about 4000 characters in length. DECTPU sets up some predefined global constants. See Section 4.9.3 for a list of predefined constants.

Constants can be either globally or locally defined. Global constants are constants declared outside procedure declarations. Once a global constant has been defined, it is set for the life of the DECTPU session. An attempt to redefine a constant will succeed only if the constant value is the same.

Local constants are constants declared within a procedure. You must specify a local CONSTANT declaration after the PROCEDURE statement and before any ON_ERROR statement. You can intermix LOCAL statements and CONSTANT statements.

Syntax

CONSTANT constant-name := compile-time-constant-expression [[,...]];

4.9.5.4 VARIABLE

With the VARIABLE declaration, you can identify certain variables as global variables. Any symbols that are neither declared nor used as the target of an assignment statement before being referenced by DECTPU are assumed to be undefined procedures. You must use the VARIABLE declaration outside a procedure declaration. Initialize global variables to the data type unspecified.

Syntax

VARIABLE variable-name [[,...]];

4.10 Lexical Keywords

The next two sections explain the DECTPU lexical keywords and how to use them for the following:

Conditional compiling

Specifying the radix of numeric constants

4–32Lexical Elements of the DEC Text Processing Utility Language

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Compaq AA-PWCBD-TE manual Lexical Keywords, EDIT/TPU/NOSECTION/NOINITIALIZE/NODISPLAY/COMMAND=temp.tpu, Constant, Variable

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