Overview of the DEC Text Processing Utility

1.3 Description of EVE

Figure 1–2 DECTPU as a Base for User-Written Interfaces

User− Written

Application

User− Written

Extensions

to EVE

EVE

Editor

D E C T P U

ZK− 6544− GE

You can implement extensions to EVE with any of the following:

•A DECTPU command file (DECTPU source code)

•A DECTPU section file (compiled DECTPU code in binary form)

•An initialization file (commands in a format that EVE can process)

Because a DECTPU section file is already compiled, startup time for your editor or application is shorter when you use a section file than when you use a command file or an initialization file. Section 2.1.2 contains more information on startup files.

To implement an editor or application that is entirely user written, use a section file. Chapter 5 contains more information on DECTPU command files, section files, and initialization files. The DEC Text Processing Utility Reference Manual contains information on layering applications on DECTPU.

1.4 DECTPU Language

You can view the DECTPU language as the most basic component of DECTPU. To access the features of DECTPU, write a program in the DECTPU language and then use the utility to compile and execute the program. A program written in DECTPU can be as simple as a single statement or as complex as the section file that implements EVE.

The block-structured DECTPU language is easy to learn and use. DECTPU language features include a large number of data types, relational operators, error interception, looping and case statements, and built-in procedures that simplify development or extension of an editor or application. Comments are indicated with a single comment character ( ! ) so that you can document your procedures easily. There are also capabilities for debugging procedures with user-written debugging programs.

Overview of the DEC Text Processing Utility 1–5

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Compaq AA-PWCBD-TE manual Dectpu Language, Dectpu as a Base for User-Written Interfaces
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AA-PWCBD-TE specifications

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