147 lines
4.2 KiB
Ruby
147 lines
4.2 KiB
Ruby
class ExcerptParser < Nokogiri::XML::SAX::Document
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attr_reader :excerpt
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SPAN_REGEX = /<\s*span[^>]*class\s*=\s*['|"]excerpt['|"][^>]*>/
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def initialize(length, options = nil)
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@length = length
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@excerpt = ""
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@current_length = 0
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options || {}
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@strip_links = options[:strip_links] == true
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@text_entities = options[:text_entities] == true
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@markdown_images = options[:markdown_images] == true
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@keep_newlines = options[:keep_newlines] == true
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@keep_emoji_images = options[:keep_emoji_images] == true
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@keep_onebox_source = options[:keep_onebox_source] == true
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@remap_emoji = options[:remap_emoji] == true
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@start_excerpt = false
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end
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def self.get_excerpt(html, length, options)
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html ||= ''
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length = html.length if html.include?('excerpt') && SPAN_REGEX === html
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me = self.new(length, options)
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parser = Nokogiri::HTML::SAX::Parser.new(me)
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catch(:done) do
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parser.parse(html)
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end
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excerpt = me.excerpt.strip
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excerpt = excerpt.gsub(/\s*\n+\s*/, "\n\n") if options[:keep_onebox_source]
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excerpt = CGI.unescapeHTML(excerpt) if options[:text_entities] == true
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excerpt
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end
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def escape_attribute(v)
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return "" unless v
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v = v.dup
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v.gsub!("&", "&")
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v.gsub!("\"", """)
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v.gsub!("<", "<")
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v.gsub!(">", ">")
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v
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end
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def include_tag(name, attributes)
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characters("<#{name} #{attributes.map { |k, v| "#{k}=\"#{escape_attribute(v)}\"" }.join(' ')}>", false, false, false)
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end
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def start_element(name, attributes = [])
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case name
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when "img"
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attributes = Hash[*attributes.flatten]
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if attributes["class"] == 'emoji'
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if @remap_emoji
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title = (attributes["alt"] || "").gsub(":", "")
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title = Emoji.lookup_unicode(title) || attributes["alt"]
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return characters(title)
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elsif @keep_emoji_images
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return include_tag(name, attributes)
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else
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return characters(attributes["alt"])
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end
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end
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# If include_images is set, include the image in markdown
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characters("!") if @markdown_images
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if !attributes["alt"].blank?
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characters("[#{attributes["alt"]}]")
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elsif !attributes["title"].blank?
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characters("[#{attributes["title"]}]")
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else
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characters("[#{I18n.t 'excerpt_image'}]")
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end
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characters("(#{attributes['src']})") if @markdown_images
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when "a"
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unless @strip_links
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include_tag(name, attributes)
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@in_a = true
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end
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when "aside"
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attributes = Hash[*attributes.flatten]
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unless @keep_onebox_source && attributes['class'].include?('onebox')
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@in_quote = true
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end
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when 'article'
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if @keep_onebox_source && attributes.include?(['class', 'onebox-body'])
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@in_quote = true
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end
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when "div", "span"
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if attributes.include?(["class", "excerpt"])
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@excerpt = ""
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@current_length = 0
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@start_excerpt = true
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end
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# Preserve spoilers
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if attributes.include?(["class", "spoiler"])
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include_tag("span", attributes)
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@in_spoiler = true
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end
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end
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end
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def end_element(name)
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case name
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when "a"
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unless @strip_links
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characters("</a>", false, false, false)
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@in_a = false
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end
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when "p", "br"
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if @keep_newlines
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characters("<br>", false, false, false)
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else
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characters(" ")
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end
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when "aside"
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@in_quote = false
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when "div", "span"
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throw :done if @start_excerpt
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characters("</span>", false, false, false) if @in_spoiler
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@in_spoiler = false
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end
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end
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def characters(string, truncate = true, count_it = true, encode = true)
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return if @in_quote
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encode = encode ? lambda { |s| ERB::Util.html_escape(s) } : lambda { |s| s }
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if count_it && @current_length + string.length > @length
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length = [0, @length - @current_length - 1].max
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@excerpt << encode.call(string[0..length]) if truncate
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@excerpt << (@text_entities ? "..." : "…")
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@excerpt << "</a>" if @in_a
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throw :done
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end
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@excerpt << encode.call(string)
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@current_length += string.length if count_it
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end
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end
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