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120 lines
2.8 KiB
120 lines
2.8 KiB
# frozen_string_literal: true
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module HtmlToPlainText
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module_function
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def call(html, line_length = 65)
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return '' if html.nil? || html.strip.empty?
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cleaned = html.gsub(%r{<!-- start text/html -->.*?<!-- end text/html -->}m, '')
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doc = Nokogiri::HTML.fragment(cleaned)
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doc.css('script').each(&:remove)
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result = process_nodes(doc, line_length)
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result.gsub!(/\r\n?/, "\n")
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result.gsub!(/[ \t]*\u00A0+[ \t]*/, ' ')
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result.gsub!(/\n[ \t]+/, "\n")
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result.gsub!(/[ \t]+\n/, "\n")
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result.gsub!(/\n{3,}/, "\n\n")
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result = word_wrap(result, line_length)
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result.gsub!(/\(([ \n])(http[^)]+)([\n ])\)/) do
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"#{"\n" if ::Regexp.last_match(1) == "\n"}( #{::Regexp.last_match(2)} )#{"\n" if ::Regexp.last_match(3) == "\n"}"
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end
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result.strip
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end
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def process_nodes(node, line_length)
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result = +''
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node.children.each do |child|
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case child
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when Nokogiri::XML::Text
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result << child.text
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when Nokogiri::XML::Comment
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next
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when Nokogiri::XML::Element
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result << process_element(child, line_length)
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end
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end
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result
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end
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def process_element(node, line_length)
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case node.name
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when 'br'
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"\n"
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when 'p', 'div'
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inner = process_nodes(node, line_length)
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inner.strip.empty? ? '' : "#{inner}\n\n"
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when 'img'
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node['alt'] || ''
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when 'a'
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process_link(node, line_length)
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when /\Ah([1-6])\z/
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process_heading(node, ::Regexp.last_match(1).to_i, line_length)
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when 'li'
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inner = process_nodes(node, line_length)
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"* #{inner.strip}\n"
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else
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process_nodes(node, line_length)
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end
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end
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def process_link(node, line_length)
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text = process_nodes(node, line_length).strip
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return '' if text.empty?
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href = node['href']
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href = href.sub(/\Amailto:/i, '') if href
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if href.nil? || text.casecmp(href.strip) == 0
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text
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else
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"#{text} ( #{href.strip} )"
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end
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end
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def process_heading(node, level, line_length)
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text = +''
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node.children.each do |child|
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text << if child.name == 'br'
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"\n"
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else
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child.text
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end
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end
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text.strip!
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hlength = text.each_line.map { |l| l.strip.length }.max || 0
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hlength = line_length if hlength > line_length
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decorated = case level
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when 1
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"#{'*' * hlength}\n#{text}\n#{'*' * hlength}"
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when 2
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"#{'-' * hlength}\n#{text}\n#{'-' * hlength}"
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else
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"#{text}\n#{'-' * hlength}"
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end
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"\n\n#{decorated}\n\n"
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end
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def word_wrap(txt, line_length)
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txt.split("\n").map do |line|
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if line.length > line_length
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line.gsub(/(.{1,#{line_length}})(\s+|$)/, "\\1\n").strip
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else
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line
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end
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end.join("\n")
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end
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end
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