DEC Text Processing Utility Program Development

5.1 Creating DECTPU Programs

Other possible reasons for a TPU$_STACKOVER condition are that you have too many statements that are not in procedures, or that you have too many small procedures. If you have too many small procedures, you must either consolidate them or break them into separate files.

To see an example of a complex DECTPU program, examine the source files that implement EVE. The EVE source code files are located at SYS$EXAMPLES:EVE$*.*. These files contain many procedure declarations and executable statements that specify EVE’s screen layout and display. These files also contain key definitions that specify which editing operations are performed when you press certain keys on the keyboard. You can examine these files to learn the programming techniques that were used to create EVE.

See Section 5.6 for information on using a command file or section file to create or customize an application layered on DECTPU. See the DEC Text Processing Utility Reference Manual for information on using the EVE$BUILD module to layer applications on top of EVE.

5.1.3 Program Syntax

The rules for writing DECTPU programs are simple. You must use a semicolon to separate each executable statement from other statements. In a program, you must place all procedure declarations before any executable statements that are not part of a procedure declaration. For information on DECTPU data types, see Chapter 3. For information on DECTPU language elements, see Chapter 4. Example 5–2 shows the correct syntax for a DECTPU program.

Example 5–2 Syntax of a DECTPU Program

PROCEDURE

.

.

.

ENDPROCEDURE

PROCEDURE;

.

.

.

ENDPROCEDURE;

.

.

.

PROCEDURE

.

.

.

ENDPROCEDURE;

statement 1; statement 2;

.

.

.

statement n;

A variety of syntactically correct DECTPU programs is shown in Example 5–3.

DEC Text Processing Utility Program Development 5–3

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Compaq AA-PWCBD-TE manual Program Syntax, Example 5-2 Syntax of a Dectpu Program
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