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Programming EPICS with PERL
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* Perl is an easy language for WEB programming (CGI)
o Needed an easy to program , yet powerful language to write code to interface to CA, SDDS and for writing CGI interface
* Object oriented
* Easy to interface to other languages like C, C++, java etc..
* Preexisting objects modules are available in abundance
* Why Perl?
o Back in 1995/96 was looking for a language to use for various applications
o C was too cumbersome
o Needed a quick and easy to use, yet a powerful language
o Tcl/Tk was used at APS but was not properly suited for the applications I was interested in (mainly WEB interface)
o Easy to learn !!
o Perl has simple constructs and looks similar to C
o Numerous modules available in CPAN for graphics and GUI
o pTK was already available for Perl in 1996
o Interpreter based language means no compilation
o Full programs can be generated easily with Perl
* Perl EZCA module was born in 1996
Quick Overview of Perl
* A high-level interpreted programming language
* Modern programming language
o Data Structures
o Control Structures
o Regular Expressions
o Object Oriented
* Perl handles both strings and numbers elegantly
o Excellent for manipulation of both strings and numbers
o Most string and arithmetic operators are similar to C
o All operators and most functions work on scalar or array data of any type
* Multi-platform support
o Unix, Linux, Windows, etc..
Quick Overview of Perl
* Data types
o Scalars need no assignment. Internally all scalars are assigned to double. However for users it takes the form of the data it holds
o Arrays can be multi-dimensional. However internally it is only one dimension
* Variable Names
o All scalars start with $
o All arrays start with @
o All hash reference start with %
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Category : Perl ProgrammingSource : www.aps.anl.gov
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Tags: arithmetic operators, object oriented perl, perl data types, platform support, programming cgi, programming language, unix linux windows, web interface, web programming