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|
# frozen_string_literal: true
class AdvancedTextFormatter < TextFormatter
class HTMLRenderer < Redcarpet::Render::HTML
def initialize(options, &block)
super(options)
@format_link = block
end
def block_code(code, _language)
<<~HTML
<pre><code>#{ERB::Util.h(code).gsub("\n", '<br/>')}</code></pre>
HTML
end
def autolink(link, link_type)
return link if link_type == :email
@format_link.call(link)
end
end
attr_reader :content_type
# @param [String] text
# @param [Hash] options
# @option options [Boolean] :multiline
# @option options [Boolean] :with_domains
# @option options [Boolean] :with_rel_me
# @option options [Array<Account>] :preloaded_accounts
# @option options [String] :content_type
def initialize(text, options = {})
@content_type = options.delete(:content_type)
super(text, options)
@text = format_markdown(text) if content_type == 'text/markdown'
end
# Differs from TextFormatter by not messing with newline after parsing
def to_s
return ''.html_safe if text.blank?
html = rewrite do |entity|
if entity[:url]
link_to_url(entity)
elsif entity[:hashtag]
link_to_hashtag(entity)
elsif entity[:screen_name]
link_to_mention(entity)
end
end
html.html_safe # rubocop:disable Rails/OutputSafety
end
# Differs from TextFormatter by operating on the parsed HTML tree
def rewrite
if @tree.nil?
src = text.gsub(Sanitize::REGEX_UNSUITABLE_CHARS, '')
@tree = Nokogiri::HTML5.fragment(src)
document = @tree.document
@tree.xpath('.//text()[not(ancestor::a | ancestor::code)]').each do |text_node|
# Iterate over text elements and build up their replacements.
content = text_node.content
replacement = Nokogiri::XML::NodeSet.new(document)
processed_index = 0
Extractor.extract_entities_with_indices(
content,
extract_url_without_protocol: false
) do |entity|
# Iterate over entities in this text node.
advance = entity[:indices].first - processed_index
if advance.positive?
# Text node for content which precedes entity.
replacement << Nokogiri::XML::Text.new(
content[processed_index, advance],
document
)
end
replacement << Nokogiri::HTML5.fragment(yield(entity))
processed_index = entity[:indices].last
end
if processed_index < content.size
# Text node for remaining content.
replacement << Nokogiri::XML::Text.new(
content[processed_index, content.size - processed_index],
document
)
end
text_node.replace(replacement)
end
end
Sanitize.node!(@tree, Sanitize::Config::MASTODON_OUTGOING).to_html
end
private
def format_markdown(html)
html = markdown_formatter.render(html)
html.delete("\r").delete("\n")
end
def markdown_formatter
extensions = {
autolink: true,
no_intra_emphasis: true,
fenced_code_blocks: true,
disable_indented_code_blocks: true,
strikethrough: true,
lax_spacing: true,
space_after_headers: true,
superscript: true,
underline: true,
highlight: true,
footnotes: false,
}
renderer = HTMLRenderer.new({
filter_html: false,
escape_html: false,
no_images: true,
no_styles: true,
safe_links_only: true,
hard_wrap: true,
link_attributes: { target: '_blank', rel: 'nofollow noopener' },
}) do |url|
link_to_url({ url: url })
end
Redcarpet::Markdown.new(renderer, extensions)
end
end
|
