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The user command processor
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The User Command Processor is a new feature of several APL*PLUS systems which allows users to define commands, analogous to system commands, that can be executed from within any workspace. This enhancement is implemented by means of two simple changes to the APL interpreter. Coupled with a suite of two-dozen predefined commands, the result is a file-based program storage and execution environment that integrates many important features not provided in standard APL systems. Using the command processor, applications of unlimited size can be developed, run, and maintained without many of the headaches that are characteristic of workspace-based systems. This paper describes the basic methods whereby the command processor operates, provides an overview of the predefined commands, shows how a new command can be defined, and illustrates how a large application can be built using the command processor.
Title: The user command processor
Description:
The User Command Processor is a new feature of several APL*PLUS systems which allows users to define commands, analogous to system commands, that can be executed from within any workspace.
This enhancement is implemented by means of two simple changes to the APL interpreter.
Coupled with a suite of two-dozen predefined commands, the result is a file-based program storage and execution environment that integrates many important features not provided in standard APL systems.
Using the command processor, applications of unlimited size can be developed, run, and maintained without many of the headaches that are characteristic of workspace-based systems.
This paper describes the basic methods whereby the command processor operates, provides an overview of the predefined commands, shows how a new command can be defined, and illustrates how a large application can be built using the command processor.
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