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Operating Systems Linux Parsing - export html table data as .csv file? Post 302973727 by bakunin on Friday 20th of May 2016 12:44:58 PM
Old 05-20-2016
Quote:
Originally Posted by lxdorney
Is there any out there have a brilliant idea on how to export html table data as .csv or write to txt file with separated comma and also get the filename of link from every table and put one line per rows each table.
Alas, there is indeed a "brilliant idea", but you probably are not going to like it: write a parser!

The solution you found (and which is similar to many others, including a few of my own) will work the way it is supposed to as long as the HTML source you feed it is "well-behaved". Well-behaved in this context means: it shall not contain constructs the creator of said solution did not think about in advance. If it does, the "solution" will perhaps break in one or the other way.

The reason is that "parsing" cannot be done with regular expressions, however cleverly arranged. "parsing" is a recursive process and with anything short of a recursive parser you might get somewhere near a solution, but not a solution in the full meaning of the word. If you are interested in why: here is it in length.

So, if you can live with some shortcomings like the chance that the "solution" you end up with will not always work, you can use what you found. If you need a real solution: i suggest the "Dragon Book" ("Principles of Compiler Design"; Aho, Sethi, Ullmann) as the best reference for building parsers, lexical analysers and similar programs.

I hope this helps.

bakunin
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Linux::Distribution::Packages(3pm)			User Contributed Perl Documentation			Linux::Distribution::Packages(3pm)

NAME
Linux::Distribution::Packages - list all packages on various Linux distributions SYNOPSIS
use Linux::Distribution::Packages qw(distribution_packages distribution_write); $linux = new Linux::Distribution::Packages({'format' => 'csv', 'output_file' => 'packages.csv'}); $linux->distribution_write(); # Or you can (re)set the options when you write. $linux->distribution_write({'format' => 'xml', 'output_file' => 'packages.xml'}); # If you want to reload the package data $linux->distribution_packages(); DESCRIPTION
This is a simple module that uses Linux::Distribution to guess the linux distribution and then uses the correct commands to list all the packages on the system and then output them in one of three formats: native, csv, and xml. Distributions currently working: debian, ubuntu, fedora, redhat, suse, gentoo, slackware, redflag. The module inherits from Linux::Distribution, so can also use its calls. EXPORT None by default. TODO
* Add the capability to correctly get packages for all recognized distributions. * Seperate out parsing from writing. Parse data to hash and give access to hash. Then write the formatted data from the hash. AUTHORS
Judith Lebzelter, <judith@osdl.org> Alberto Re, <alberto@accidia.net> COPYRIGHT AND LICENSE
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.5 or, at your option, any later version of Perl 5 you may have available. perl v5.10.1 2006-04-19 Linux::Distribution::Packages(3pm)
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