Hpricot Relative Path

[Josh Cheek]

[Note: parts of this message were removed to make it a legal post.]

I'm trying to write a script that pulls out an image from a yfrog page

So this is what I have

require 'rubygems'
require 'hpricot'
require 'open-uri'

url = 'http://yfrog.com/03gssacj'
doc = Hpricot(open(url))

(doc%"#main_image").attributes['src'] # => "/img3/7036/gssac.jpg"

The problem is that the path is relative.
I've done a little googling, queried my ruby and rails ML archives, glanced
at hpricot code, and looked through the method lists for open-uri and
hpricot.
So far, I don't see anything that looks very useful.
Is there a way to have it give me the absolute path so that I can reference
the picture later?

The only thing I've found that works so far involves string manipulation,
which seems like a brittle workaround to replace something that probably
exists if I could just find it.

url = 'http://yfrog.com/03gssacj'
page = open(url)
base = page.base_uri.to_s[ /(?:http:\/\/)?[^\/]*\// ] # => "
http://img3.yfrog.com/"
relative = (Hpricot(page)%"#main_image").attributes['src'] # =>
"/img3/7036/gssac.jpg"
absolute = URI.join( base , relative )
absolute.to_s # => "http://img3.yfrog.com/img3/7036/gssac.jpg"

Anyone know of a better solution?

 

[Ben Bleything]

The problem is that the path is relative.
I've done a little googling, queried my ruby and rails ML archives, glanced
at hpricot code, and looked through the method lists for open-uri and
hpricot.
So far, I don't see anything that looks very useful.
Is there a way to have it give me the absolute path so that I can reference
the picture later?

Hpricot is just telling you what's in the HTML. Munging the
document's contents are your responsibility, not the parser's

The only thing I've found that works so far involves string manipulation,
which seems like a brittle workaround to replace something that probably
exists if I could just find it.

Look into the URI library.

require 'uri'

uri = URI.parse( "http://yfrog.com/03gssacj" )
uri.path = # your hpricot magic to get the image path goes here

Ben

 

[Josh Cheek]

[Note: parts of this message were removed to make it a legal post.]

Hpricot is just telling you what's in the HTML. Munging the
document's contents are your responsibility, not the parser's


Look into the URI library.

require 'uri'

uri = URI.parse( "http://yfrog.com/03gssacj" )
uri.path = # your hpricot magic to get the image path goes here

Ben

Thanks, this is what I am using now:

page = open url
image_path = URI.parse page.base_uri.to_s.sub( %r(/$) , '' )
image_path.path = (Hpricot(page)%"#main_image").attributes['src']
image_path.to_s

It still seems a little excessive, but it's a lot better than what I had
before.