162 lines
4.5 KiB
Ruby
162 lines
4.5 KiB
Ruby
require 'redcarpet'
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require 'nokogiri'
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require 'rails_guides/markdown/renderer'
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module RailsGuides
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class Markdown
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def initialize(view, layout)
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@view = view
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@layout = layout
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@index_counter = Hash.new(0)
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@raw_header = ''
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@node_ids = {}
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end
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def render(body)
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@raw_body = body
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extract_raw_header_and_body
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generate_header
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generate_title
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generate_body
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generate_structure
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generate_index
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render_page
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end
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private
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def dom_id(nodes)
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dom_id = dom_id_text(nodes.last.text)
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# Fix duplicate node by prefix with its parent node
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if @node_ids[dom_id]
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if @node_ids[dom_id].size > 1
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duplicate_nodes = @node_ids.delete(dom_id)
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new_node_id = "#{duplicate_nodes[-2][:id]}-#{duplicate_nodes.last[:id]}"
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duplicate_nodes.last[:id] = new_node_id
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@node_ids[new_node_id] = duplicate_nodes
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end
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dom_id = "#{nodes[-2][:id]}-#{dom_id}"
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end
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@node_ids[dom_id] = nodes
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dom_id
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end
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def dom_id_text(text)
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text.downcase.gsub(/\?/, '-questionmark').gsub(/!/, '-bang').gsub(/[^a-z0-9]+/, ' ')
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.strip.gsub(/\s+/, '-')
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end
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def engine
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@engine ||= Redcarpet::Markdown.new(Renderer, {
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no_intra_emphasis: true,
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fenced_code_blocks: true,
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autolink: true,
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strikethrough: true,
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superscript: true,
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tables: true
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})
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end
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def extract_raw_header_and_body
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if @raw_body =~ /^\-{40,}$/
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@raw_header, _, @raw_body = @raw_body.partition(/^\-{40,}$/).map(&:strip)
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end
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end
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def generate_body
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@body = engine.render(@raw_body)
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end
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def generate_header
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@header = engine.render(@raw_header).html_safe
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end
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def generate_structure
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@headings_for_index = []
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if @body.present?
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@body = Nokogiri::HTML(@body).tap do |doc|
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hierarchy = []
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doc.at('body').children.each do |node|
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if node.name =~ /^h[3-6]$/
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case node.name
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when 'h3'
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hierarchy = [node]
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@headings_for_index << [1, node, node.inner_html]
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when 'h4'
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hierarchy = hierarchy[0, 1] + [node]
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@headings_for_index << [2, node, node.inner_html]
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when 'h5'
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hierarchy = hierarchy[0, 2] + [node]
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when 'h6'
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hierarchy = hierarchy[0, 3] + [node]
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end
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node[:id] = dom_id(hierarchy)
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node.inner_html = "#{node_index(hierarchy)} #{node.inner_html}"
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end
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end
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end.to_html
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end
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end
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def generate_index
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if @headings_for_index.present?
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raw_index = ''
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@headings_for_index.each do |level, node, label|
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if level == 1
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raw_index += "1. [#{label}](##{node[:id]})\n"
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elsif level == 2
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raw_index += " * [#{label}](##{node[:id]})\n"
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end
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end
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@index = Nokogiri::HTML(engine.render(raw_index)).tap do |doc|
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doc.at('ol')[:class] = 'chapters'
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end.to_html
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@index = <<-INDEX.html_safe
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<div id="subCol">
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<h3 class="chapter"><img src="images/chapters_icon.gif" alt="" />Chapters</h3>
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#{@index}
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</div>
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INDEX
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end
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end
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def generate_title
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if heading = Nokogiri::HTML(@header).at(:h2)
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@title = "Ruby on Rails Guides: #{heading.text}".html_safe
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else
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@title = "Ruby on Rails Guides"
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end
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end
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def node_index(hierarchy)
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case hierarchy.size
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when 1
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@index_counter[2] = @index_counter[3] = @index_counter[4] = 0
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"#{@index_counter[1] += 1}"
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when 2
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@index_counter[3] = @index_counter[4] = 0
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"#{@index_counter[1]}.#{@index_counter[2] += 1}"
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when 3
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@index_counter[4] = 0
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"#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3] += 1}"
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when 4
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"#{@index_counter[1]}.#{@index_counter[2]}.#{@index_counter[3]}.#{@index_counter[4] += 1}"
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end
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end
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def render_page
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@view.content_for(:header_section) { @header }
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@view.content_for(:page_title) { @title }
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@view.content_for(:index_section) { @index }
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@view.render(:layout => @layout, :text => @body)
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end
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end
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end
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