class MetaInspector::Parsers::ImagesParser
Public Class Methods
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# File lib/meta_inspector/parsers/images.rb, line 11 def initialize(main_parser, options = {}) @download_images = options[:download_images] super(main_parser) end
Calls superclass method
MetaInspector::Parsers::Base::new
Public Instance Methods
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# File lib/meta_inspector/parsers/images.rb, line 22 def best owner_suggested || largest end
Returns either the Facebook Open Graph image, twitter suggested image or the largest image in the image collection
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# File lib/meta_inspector/parsers/images.rb, line 73 def favicon query = '//link[@rel="icon" or contains(@rel, "shortcut")]' value = parsed.xpath(query)[0].attributes['href'].value @favicon ||= URL.absolutify(value, base_url, normalize: false) rescue nil end
Return favicon url if exist
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# File lib/meta_inspector/parsers/images.rb, line 60 def largest @largest_image ||= begin imgs_with_size = with_size.dup imgs_with_size.keep_if do |url, width, height| ratio = width.to_f / height.to_f ratio > 0.1 && ratio < 10 end url, width, height = imgs_with_size.first url end end
Returns the largest image from the image collection, filtered for images that are more square than 10:1 or 1:10
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# File lib/meta_inspector/parsers/images.rb, line 30 def owner_suggested suggested_img = content_of(meta['og:image']) || content_of(meta['twitter:image']) URL.absolutify(suggested_img, base_url, normalize: false) if suggested_img end
Returns the parsed image from Facebookâs open graph property tags Most major websites now define this property and is usually relevant See doc at developers.facebook.com/docs/opengraph/ If none found, tries with Twitter image
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# File lib/meta_inspector/parsers/images.rb, line 36 def with_size @with_size ||= begin img_nodes = parsed.search('//img').select{ |img_node| img_node['src'] } imgs_with_size = img_nodes.map do |img_node| [URL.absolutify(img_node['src'], base_url, normalize: false), img_node['width'], img_node['height']] end imgs_with_size.uniq! { |url, width, height| url } if @download_images imgs_with_size.map! do |url, width, height| width, height = FastImage.size(url) if width.nil? || height.nil? [url, width.to_i, height.to_i] end else imgs_with_size.map! do |url, width, height| width, height = [0, 0] if width.nil? || height.nil? [url, width.to_i, height.to_i] end end imgs_with_size.sort_by { |url, width, height| -(width.to_i * height.to_i) } end end
Returns an array of [img_url, width, height] sorted by image area (width * height)
Private Instance Methods
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# File lib/meta_inspector/parsers/images.rb, line 87 def absolutified_images parsed_images.map { |i| URL.absolutify(i, base_url, normalize: false) } end
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# File lib/meta_inspector/parsers/images.rb, line 95 def content_of(content) return nil if content.nil? || content.empty? content end
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# File lib/meta_inspector/parsers/images.rb, line 83 def images_collection @images_collection ||= absolutified_images end
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# File lib/meta_inspector/parsers/images.rb, line 91 def parsed_images cleanup(parsed.search('//img/@src')) end