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module RailsGuides
class Markdown
class Renderer < Redcarpet::Render::HTML
def initialize(options = {})
super
end
def block_code(code, language)
<<-HTML
<div class="code_container">
<pre class="brush: #{brush_for(language)}; gutter: false; toolbar: false">
#{ERB::Util.h(code)}
</pre>
</div>
HTML
end
def header(text, header_level)
# Always increase the heading level by 1, so we can use h1, h2 heading in the document
header_level += 1
%(<h#{header_level}>#{text}</h#{header_level}>)
end
def paragraph(text)
if text =~ /^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:]/
convert_notes(text)
elsif text.include?("DO NOT READ THIS FILE ON GITHUB")
elsif text =~ /^\[<sup>(\d+)\]:<\/sup> (.+)$/
linkback = %(<a href="#footnote-#{$1}-ref"><sup>#{$1}</sup></a>)
%(<p class="footnote" id="footnote-#{$1}">#{linkback} #{$2}</p>)
else
text = convert_footnotes(text)
"<p>#{text}</p>"
end
end
private
def convert_footnotes(text)
text.gsub(/\[<sup>(\d+)\]<\/sup>/i) do
%(<sup class="footnote" id="footnote-#{$1}-ref">) +
%(<a href="#footnote-#{$1}">#{$1}</a></sup>)
end
end
def brush_for(code_type)
case code_type
when "ruby", "sql", "plain"
code_type
when "erb", "html+erb"
"ruby; html-script: true"
when "html"
"xml" # HTML is understood, but there are .xml rules in the CSS
else
"plain"
end
end
def convert_notes(body)
# The following regexp detects special labels followed by a
# paragraph, perhaps at the end of the document.
#
# It is important that we do not eat more than one newline
# because formatting may be wrong otherwise. For example,
# if a bulleted list follows the first item is not rendered
# as a list item, but as a paragraph starting with a plain
# asterisk.
body.gsub(/^(TIP|IMPORTANT|CAUTION|WARNING|NOTE|INFO|TODO)[.:](.*?)(\n(?=\n)|\Z)/m) do
css_class = \
case $1
when "CAUTION", "IMPORTANT"
"warning"
when "TIP"
"info"
else
$1.downcase
end
%(<div class="#{css_class}"><p>#{$2.strip}</p></div>)
end
end
end
end
end
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