Abc Template Clarion Generator Then Turns

A version of Clarion 2.x for end-users, Clarion Personal Developer, was also released for the business user to create personal applications.

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Abc Template Clarion Generator Then Turns

The generator then turns this higher level into code, which in turn is then compiled and linked using a normal compiler and linker.

This generation layer is sometimes referred to as 4GL programming.

This process of embedding code can be done while viewing the surrounding generated code.

This mixing of template code and generated code allows the template settings to be updated, and the code regenerated, without loss of the embedded code.

Many templates have been written by various developers: some are offered as commercial add-ons, and some are free.

Clarion was created by Bruce Barrington, one of the founders of healthcare firm HBO Company (later acquired by McKesson Corporation, 1 ) and a small team of developers.

Barringtons goal was to create a language that would be compact and expressive, and would maximize the use of the memory-mapped screen of the IBM PC by creating a screen designer.

Version 1 produced pseudocode; the initial release included a screen designer, an interpreter, an editor, and a debugger.

Initially it supported databases composed of DAT files which was Clarions proprietary ISAM file format.

Bruce Barrington formed Barrington Systems and released version 1.0.

This was offset by the ability to create royalty-free applications.

Named Personal Developer, it strictly limited what a user could do, but was adequate for very basic database applications.

CPD generated Clarion code based on the contents of that dictionary and a template called a model file.

Because the model file was a text file, it could be modified (in limited ways) to create custom code.

The model file was implemented with the browse and form paradigm, where data is initially displayed to the user in list box, and updating is done via a form called via buttons associated with the list.

Designer created all the essential of the CRUD (create, read, update, delete) code, and developers could enhance functions by inserting code at specified points in the generated code, or by hand-coding new procedures.

Clarion Professional Developer also introduced Language Extension Modules (LEMs), that could extend the language using modules compiled in other languages that were built to the LEM format.

Clarion Software and many third-party tool developers created LEMs for all purposes, including an extension for connecting to other databases such as dBase, Clipper, and Paradox.