mirror of https://github.com/Siphonay/mastodon
132 lines
3.4 KiB
Ruby
132 lines
3.4 KiB
Ruby
# 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.squish
|
|
<pre><code>#{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
|
|
|
|
# @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 skipping HTML tags and entities
|
|
def entities
|
|
@entities ||= begin
|
|
gaps = []
|
|
total_offset = 0
|
|
|
|
escaped = text.gsub(/<[^>]*>|&#[0-9]+;/) do |match|
|
|
total_offset += match.length - 1
|
|
end_offset = Regexp.last_match.end(0)
|
|
gaps << [end_offset - total_offset, total_offset]
|
|
' '
|
|
end
|
|
|
|
Extractor.extract_entities_with_indices(escaped, extract_url_without_protocol: false).map do |entity|
|
|
start_pos, end_pos = entity[:indices]
|
|
offset_idx = gaps.rindex { |gap| gap.first <= start_pos }
|
|
offset = offset_idx.nil? ? 0 : gaps[offset_idx].last
|
|
entity.merge(indices: [start_pos + offset, end_pos + offset])
|
|
end
|
|
end
|
|
end
|
|
|
|
private
|
|
|
|
# Differs from `TextFormatter` in that it keeps HTML; but it sanitizes at the end to remain safe
|
|
def rewrite
|
|
entities.sort_by! do |entity|
|
|
entity[:indices].first
|
|
end
|
|
|
|
result = ''.dup
|
|
|
|
last_index = entities.reduce(0) do |index, entity|
|
|
indices = entity[:indices]
|
|
result << text[index...indices.first]
|
|
result << yield(entity)
|
|
indices.last
|
|
end
|
|
|
|
result << text[last_index..-1]
|
|
|
|
Sanitize.fragment(result, Sanitize::Config::MASTODON_OUTGOING)
|
|
end
|
|
|
|
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
|