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Top Forums Shell Programming and Scripting Perl syntax and html ole parsing Post 302712995 by wakatana on Wednesday 10th of October 2012 06:24:30 AM
Old 10-10-2012
Perl syntax and html ole parsing

Hi gurus
I am trying to understand some advanced (for me) perl constructions (syntax) following this tutorial I am trying to parse html:
Using Mojo:SmilieOM | Joel Berger [blogs.perl.org]


Code:
say "div days:";
say $_->text for $dom->find('div.days')->each;

say "\nspan hours:";
say $_->text for $dom->find('span.hours')->each;

What does this syntax mean, what is going on here ?
- What kind of loop is this, classic for construction looks like this: for(i=0;i<10;i++){ code } not: {code} for (some_condition)
- What does "each" keyword mean in this context ? Does it have somethin common with "each" build in perl function
each - perldoc.perl.org or it is specific to Mojo:SmilieOM ?
IMHO on Mojo:SmilieOM homepage I did not found any mention about "each" under methods section Mojo:SmilieOM - search.cpan.org
so it must be a build in function of perl, but this buildin "each" function has completelly different syntax, how is this possible, am I missing somethin ?



Another example from tutorial page
Code:
say "Open Times:";
say for $dom->find('div.openTime')
            ->map(sub{$_->children->each})
            ->map(sub{$_->text})
            ->each;

Same issue as above for "map" and "sub" methods
map - perldoc.perl.org sub - perldoc.perl.org



- Can be those pieces of "Perlish" code rewriten in more "C specific" maner so I can understand it?
- Most important: How to list all methods their parameters and return values contained in Mojo:SmilieOM ?
it must be done somehow, because I read that even for perl there are IDE with intelisense (autcompletition) so this IDE must know the methods return value types etc.



Thank you very much
 

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URI::URL(3pm)						User Contributed Perl Documentation					     URI::URL(3pm)

NAME
URI::URL - Uniform Resource Locators SYNOPSIS
$u1 = URI::URL->new($str, $base); $u2 = $u1->abs; DESCRIPTION
This module is provided for backwards compatibility with modules that depend on the interface provided by the "URI::URL" class that used to be distributed with the libwww-perl library. The following differences exist compared to the "URI" class interface: o The URI::URL module exports the url() function as an alternate constructor interface. o The constructor takes an optional $base argument. The "URI::URL" class is a subclass of "URI::WithBase". o The URI::URL->newlocal class method is the same as URI::file->new_abs. o URI::URL::strict(1) o $url->print_on method o $url->crack method o $url->full_path: same as ($uri->abs_path || "/") o $url->netloc: same as $uri->authority o $url->epath, $url->equery: same as $uri->path, $uri->query o $url->path and $url->query pass unescaped strings. o $url->path_components: same as $uri->path_segments (if you don't consider path segment parameters) o $url->params and $url->eparams methods o $url->base method. See URI::WithBase. o $url->abs and $url->rel have an optional $base argument. See URI::WithBase. o $url->frag: same as $uri->fragment o $url->keywords: same as $uri->query_keywords o $url->localpath and friends map to $uri->file. o $url->address and $url->encoded822addr: same as $uri->to for mailto URI o $url->groupart method for news URI o $url->article: same as $uri->message SEE ALSO
URI, URI::WithBase COPYRIGHT
Copyright 1998-2000 Gisle Aas. perl v5.14.2 2012-02-11 URI::URL(3pm)
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