Class: Mechanize::Page::Image

Inherits:
Object
  • Object
show all
Defined in:
lib/mechanize/page/image.rb

Overview

An image element on an HTML page

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(node, page) ⇒ Image

Creates a new Mechanize::Page::Image from an image node and source page.



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# File 'lib/mechanize/page/image.rb', line 14

def initialize node, page
  @node = node
  @page = page
  @mech = page.mech
end

Instance Attribute Details

#mech ⇒ Object

Returns the value of attribute mech.



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# File 'lib/mechanize/page/image.rb', line 8

def mech
  @mech
end

#node ⇒ Object (readonly)

Returns the value of attribute node.



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# File 'lib/mechanize/page/image.rb', line 6

def node
  @node
end

#page ⇒ Object

Returns the value of attribute page.



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# File 'lib/mechanize/page/image.rb', line 7

def page
  @page
end

Instance Method Details

#alt ⇒ Object

The alt attribute of the image



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# File 'lib/mechanize/page/image.rb', line 23

def alt
  node['alt']
end

#caption ⇒ Object Also known as: text

The caption of the image. In order of preference, the #title, #alt, or empty string “”.



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# File 'lib/mechanize/page/image.rb', line 31

def caption
  title || alt || ''
end

#dom_class ⇒ Object

The class attribute of the image



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# File 'lib/mechanize/page/image.rb', line 40

def dom_class
  node['class']
end

#dom_id ⇒ Object

The id attribute of the image



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# File 'lib/mechanize/page/image.rb', line 47

def dom_id
  node['id']
end

#extname ⇒ Object

The suffix of the #url. The dot is a part of suffix, not a delimiter.

p image.url     # => "http://example/test.jpg"
p image.extname # => ".jpg"

Returns an empty string if #url has no suffix:

p image.url     # => "http://example/sampleimage"
p image.extname # => ""



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# File 'lib/mechanize/page/image.rb', line 62

def extname
  return nil unless src

  File.extname url.path
end

#fetch(parameters = [], referer = nil, headers = {}) ⇒ Object

Downloads the image.

agent.page.image_with(:src => /logo/).fetch.save

The referer is:

#page(“parent”)

all images on http html, relative #src images on https html

(no referer)

absolute #src images on https html

user specified

img.fetch(nil, my_referer_uri_or_page)



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# File 'lib/mechanize/page/image.rb', line 82

def fetch parameters = [], referer = nil, headers = {}
  mech.get src, parameters, referer || image_referer, headers
end

#height ⇒ Object

The height attribute of the image



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# File 'lib/mechanize/page/image.rb', line 89

def height
  node['height']
end

#image_referer ⇒ Object

:nodoc:



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# File 'lib/mechanize/page/image.rb', line 93

def image_referer # :nodoc:
  http_page  = page.uri && page.uri.scheme == 'http'
  https_page = page.uri && page.uri.scheme == 'https'

  case
  when http_page               then page
  when https_page && relative? then page
  else
    Mechanize::File.new(nil, { 'content-type' => 'text/plain' }, '', 200)
  end
end

#mime_type ⇒ Object

MIME type guessed from the image url suffix

p image.extname   # => ".jpg"
p image.mime_type # => "image/jpeg"
page.images_with(:mime_type => /gif|jpeg|png/).each do ...

Returns nil if url has no (well-known) suffix:

p image.url       # => "http://example/sampleimage"
p image.mime_type # => nil



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# File 'lib/mechanize/page/image.rb', line 117

def mime_type
  suffix_without_dot = extname ? extname.sub(/\A\./){''}.downcase : nil

  Mechanize::Util::DefaultMimeTypes[suffix_without_dot]
end

#pretty_print(q) ⇒ Object

:nodoc:



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# File 'lib/mechanize/page/image.rb', line 123

def pretty_print(q) # :nodoc:
  q.object_group(self) {
    q.breakable; q.pp url
    q.breakable; q.pp caption
  }
end

#relative? ⇒ Boolean

:nodoc:

Returns:

  • (Boolean) 


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# File 'lib/mechanize/page/image.rb', line 132

def relative? # :nodoc:
  %r{^https?://} !~ src
end

#src ⇒ Object

The src attribute of the image



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# File 'lib/mechanize/page/image.rb', line 139

def src
  node['src']
end

#title ⇒ Object

The title attribute of the image



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# File 'lib/mechanize/page/image.rb', line 146

def title
  node['title']
end

#to_s ⇒ Object

The URL string of this image



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# File 'lib/mechanize/page/image.rb', line 153

def to_s
  url.to_s
end

#url ⇒ Object

URI for this image



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# File 'lib/mechanize/page/image.rb', line 160

def url
  if relative? then
    if page.bases[0] then
       page.bases[0].href + src
    else
      page.uri + src
    end
  else
    src
  end
end

#width ⇒ Object

The width attribute of the image



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# File 'lib/mechanize/page/image.rb', line 175

def width
  node['width']
end