From: "lrlebron@..." <lrlebron@...>
Date: 2007-09-02T08:25:13+09:00
Subject: Re: Parsing query parameters from hyperlink

On Sep 1, 2:47 pm, Aaron Patterson <aa...@tenderlovemaking.com> wrote:
> On Sun, Sep 02, 2007 at 04:30:05AM +0900, lrleb...@gmail.com wrote:
> > On Sep 1, 2:15 pm, Aaron Patterson <aa...@tenderlovemaking.com> wrote:
> > > On Sun, Sep 02, 2007 at 04:00:20AM +0900, Robert Klemme wrote:
> > > > On 01.09.2007 19:34, lrleb...@gmail.com wrote:
> > > > >I am trying to parse strings like this
> > > > ><a href='showmono.asp?cpnum=1022&ampmonotype=comb' target='main'>
>
> > > > >I need to get the cpnum value (555)
>
> > > > >I am using the following function
>
> > > > >def get_drugId(link)
> > > > >     arrParts = link.html.split('?')
> > > > >     cpnum = arrParts[1].split('&amp')
> > > > >     cpnumparts= cpnum[0].split("=")
> > > > >     drugId = cpnumparts[1]
> > > > >  end
>
> > > > >but I imagine there is a simpler way to do this. Also, I would like
> > > > >something more flexible that would return all the query parameters (if
> > > > >there are more than one) in an array or a hash.
>
> > > > >Any ideas?
>
> > > > The std lib:
>
> > > > require 'uri'
>
> > > > irb(main):006:0> u=URI.parse("http://foo/bar?dodo=1&dada=2")
> > > > => #<URI::HTTP:0x3ff9814a URL:http://foo/bar?dodo=1&dada=2>
> > > > irb(main):007:0> u.query
> > > > => "dodo=1&dada=2"
> > > > irb(main):008:0> u.query.split('&')
> > > > => ["dodo=1", "dada=2"]
> > > > ...
>
> > > Query strings are allowed to use semicolons as delimeters, not to
> > > mention you must handle multiple values per key. I recommend using the
> > > CGI library with the URI library:
>
> > >   irb(main):001:0> require 'uri'
> > >   => true
> > >   irb(main):002:0> require 'cgi'
> > >   => true
> > >   irb(main):003:0> CGI.parse(URI.parse('http://foo/?a=b&b=c').query)
> > >   => {"a"=>["b"], "b"=>["c"]}
> > >   irb(main):004:0> CGI.parse(URI.parse('http://foo/?a=b;b=c').query)
> > >   => {"a"=>["b"], "b"=>["c"]}
> > >   irb(main):005:0> CGI.parse(URI.parse('http://foo/?b=a;b=c').query)
> > >   => {"b"=>["a", "c"]}
> > >   irb(main):006:0>
>
> > > --
> > > Aaron Pattersonhttp://tenderlovemaking.com/-Hide quoted text -
>
> > > - Show quoted text -
>
> > This would work if the string where a proper url. But it is a
> > hyperlink.
>
> Use hpricot to extract the href, then feed it though URI and CGI.
>
> --
> Aaron Pattersonhttp://tenderlovemaking.com/

Here's what I ended up with

require 'uri'
require 'cgi'
require 'hpricot'

 def get_query_value(link, key='')
          doc = Hpricot(link)

     if key.empty?
        CGI.parse(URI.parse(doc.at("a")['href']).query)
     else
        CGI.parse(URI.parse(doc.at("a")['href']).query)[key]
     end

 end

str = "<a href='showmono.asp?cpnum=555&monotype=full' target='main'>"

p get_query_value(str)
puts get_query_value(str,'cpnum')
puts get_query_value(str,'monotype')

It allows me to ask for the complete hash or a particular key

Thanks,

Luis