08b1c76533
There are a handful of places where we need to strip markup from a piece of dtext, primarily in <meta> description tags in the wiki. Currently the dtext parser handles this by having a special mode where it parses the text but doesn't output html tags. Here we refactor to instead parse the text normally then strip out the html tags after the fact. This is more flexible and allows us to simplify a lot of things in the dtext parser. This also produces more readable output than before in certain cases.
134 lines
3.7 KiB
Ruby
134 lines
3.7 KiB
Ruby
require 'cgi'
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require 'uri'
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class DText
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MENTION_REGEXP = /(?<=^| )@\S+/
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def self.quote(message, creator_name)
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stripped_body = DText.strip_blocks(message, "quote")
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"[quote]\n#{creator_name} said:\n\n#{stripped_body}\n[/quote]\n\n"
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end
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def self.parse_mentions(text)
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text = strip_blocks(text.to_s, "quote")
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names = text.scan(MENTION_REGEXP).map do |mention|
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mention.gsub(/(?:^\s*@)|(?:[:;,.!?\)\]<>]$)/, "")
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end
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names.uniq
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end
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def self.strip_blocks(string, tag)
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n = 0
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stripped = ""
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string = string.dup
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string.gsub!(/\s*\[#{tag}\](?!\])\s*/mi, "\n\n[#{tag}]\n\n")
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string.gsub!(/\s*\[\/#{tag}\]\s*/mi, "\n\n[/#{tag}]\n\n")
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string.gsub!(/(?:\r?\n){3,}/, "\n\n")
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string.strip!
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string.split(/\n{2}/).each do |block|
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case block
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when "[#{tag}]"
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n += 1
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when "[/#{tag}]"
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n -= 1
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else
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if n == 0
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stripped << "#{block}\n\n"
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end
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end
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end
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stripped.strip
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end
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def self.strip_dtext(dtext)
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html = DTextRagel.parse(dtext)
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text = to_plaintext(html)
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text
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end
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def self.to_plaintext(html)
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text = from_html(html) do |node|
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case node.name
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when "a", "strong", "em", "u", "s", "h1", "h2", "h3", "h4", "h5", "h6"
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node.name = "span"
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node.content = node.text
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when "blockquote"
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node.name = "span"
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node.content = to_plaintext(node.inner_html).gsub(/^/, "> ")
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end
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end
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text = text.gsub(/\A[[:space:]]+|[[:space:]]+\z/, "")
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end
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def self.from_html(text, inline: false, &block)
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html = Nokogiri::HTML.fragment(text)
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dtext = html.children.map do |element|
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block.call(element) if block.present?
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case element.name
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when "text"
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element.content.gsub(/(?:\r|\n)+$/, "")
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when "br"
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"\n"
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when "p", "ul", "ol"
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from_html(element.inner_html, &block).strip + "\n\n"
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when "blockquote"
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"[quote]#{from_html(element.inner_html, &block).strip}[/quote]\n\n" if element.inner_html.present?
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when "small", "sub"
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"[tn]#{from_html(element.inner_html, &block)}[/tn]" if element.inner_html.present?
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when "b", "strong"
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"[b]#{from_html(element.inner_html, &block)}[/b]" if element.inner_html.present?
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when "i", "em"
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"[i]#{from_html(element.inner_html, &block)}[/i]" if element.inner_html.present?
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when "u"
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"[u]#{from_html(element.inner_html, &block)}[/u]" if element.inner_html.present?
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when "s", "strike"
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"[s]#{from_html(element.inner_html, &block)}[/s]" if element.inner_html.present?
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when "li"
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"* #{from_html(element.inner_html, &block)}\n" if element.inner_html.present?
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when "h1", "h2", "h3", "h4", "h5", "h6"
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hN = element.name
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title = from_html(element.inner_html, &block)
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"#{hN}. #{title}\n\n"
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when "a"
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title = from_html(element.inner_html, inline: true, &block).strip
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url = element["href"]
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%("#{title}":[#{url}]) if title.present? && url.present?
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when "img"
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alt_text = element.attributes["title"] || element.attributes["alt"] || ""
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src = element["src"]
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if inline
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alt_text
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elsif alt_text.present? && src.present?
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%("#{alt_text}":[#{src}]\n\n)
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else
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""
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end
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when "comment"
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# ignored
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else
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from_html(element.inner_html, &block)
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end
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end.join
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dtext
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end
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# extract the first paragraph `needle` occurs in.
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def self.excerpt(dtext, needle)
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dtext = dtext.gsub(/\r\n|\r|\n/, "\n")
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excerpt = ActionController::Base.helpers.excerpt(dtext, needle, separator: "\n\n", radius: 1, omission: "")
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excerpt
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end
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end
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