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ePerl 2.2.13

  Date Added: May 14, 2010  |  Visits: 558

ePerl

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ePerl is an Embedded Perl 5 Language. SYNOPSIS eperl [-d name=value] [-D name=value] [-B begin_delimiter] [-E end_delimiter] [-i] [-m mode] [-o outputfile] [-k] [-I directory] [-P] [-C] [-L] [-x] [-T] [-w] [-c] [inputfile] eperl [-r] [-l] [-v] [-V] Abstract ePerl interprets an ASCII file bristled with Perl 5 program statements by evaluating the Perl 5 code while passing through the plain ASCII data. It can operate in various ways: As a stand-alone Unix filter or integrated Perl 5 module for general file generation tasks and as a powerful Webserver scripting language for dynamic HTML page programming. Introduction The eperl program is the Embedded Perl 5 Language interpreter. This really is a full-featured Perl 5 interpreter, but with a different calling environment and source file layout than the default Perl interpreter (usually the executable perl or perl5 on most systems). It is designed for general ASCII file generation with the philosophy of embedding the Perl 5 program code into the ASCII data instead of the usual way where you embed the ASCII data into a Perl 5 program (usually by quoting the data and using them via print statements). So, instead of writing a plain Perl script like #!/path/to/perl print "foo barn"; print "baz quuxn"; for ($i = 0; $i < 10; $i++) { print "foo #${i}n"; } print "foo barn"; print "baz quuxn"; you can write it now as an ePerl script: #!/path/to/eperl foo bar baz quux <: for ($i = 0; $i < 10; $i++) { print "foo #${i}n"; } :> foo bar baz quux Although the ePerl variant has a different source file layout, the semantic is the same, i.e. both scripts create exactly the same resulting data on STDOUT. Intention ePerl is simply a glue code which combines the programming power of the Perl 5 interpreter library with a tricky embedding technique. The embedding trick is this: it converts the source file into a valid Perl script which then gets entirely evaluated by only one internal instance of the Perl 5 interpreter. To achieve this, ePerl translates all plain code into (escaped) Perl 5 strings placed into print constructs while passing through all embedded native Perl 5 code. As you can see, ePerl itself does exactly the same internally, a silly programmer had to do when writing a plain Perl generation script. Due to the nature of such bristled code, ePerl is really the better attempt when the generated ASCII data contains really more static as dynamic data. Or in other words: Use ePerl if you want to keep the most of the generated ASCII data in plain format while just programming some bristled stuff. Do not use it when generating pure dynamic data. There it brings no advantage to the ordinary program code of a plain Perl script. So, the static part should be at least 60% or the advantage becomes a disadvantage. ePerl in its origin was actually designed for an extreme situation: as a webserver scripting-language for on-the-fly HTML page generation. Here you have the typical case that usually 90% of the data consists of pure static HTML tags and plain ASCII while just the remaining 10% are programming constructs which dynamically generate more markup code. This is the reason why ePerl beside its standard Unix filtering runtime-mode also supports the CGI/1.1 and NPH-CGI/1.1 interfaces..

Requirements: No special requirements
Platforms: Linux
Keyword: Ascii Code Data Embedded Perl Eperl Html Libraries Perl Print Programming
Users rating: 0/10

License: Freeware Size: 194.56 KB
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