demarches-normaliennes/app/components/simple_format_component.rb

86 lines
2.6 KiB
Ruby

class SimpleFormatComponent < ApplicationComponent
# see: https://github.com/vmg/redcarpet#and-its-like-really-simple-to-use
REDCARPET_EXTENSIONS = {
no_intra_emphasis: true,
disable_indented_code_blocks: true,
space_after_headers: true,
tables: false,
fenced_code_blocks: false,
autolink: false,
strikethrough: false,
lax_spacing: false,
superscript: false,
underline: false,
highlight: false,
quote: false,
footnotes: false
}
# see: https://github.com/vmg/redcarpet#darling-i-packed-you-a-couple-renderers-for-lunch
REDCARPET_RENDERER_OPTS = {
no_images: true
}
SIMPLE_URL_REGEX = %r{https?://[^\s<>]+}
EMAIL_IN_TEXT_REGEX = Regexp.new(Devise.email_regexp.source.gsub(/\\A|\\z/, '\b'))
def initialize(text, allow_a: true, allow_autolink: true, class_names_map: {})
@allow_a = allow_a
@allow_autolink = allow_a || allow_autolink
# Logic for html links/autolinks:
# Sometimes we want to allow autolinking of urls, without allowing html/markdown links from users.
# Because we sanitize the rendered markdown, when html links are not allowed, we can't enable redcarpet autolink
# (it would be sanitized), so we manually autolink after sanitization.
# At the contrary, when links are allowed, autolinking is always made with redcarpet.
list_item = false
lines = (text || "")
.lines
.map(&:lstrip) # this block prevent redcarpet to consider " text" as block code by lstriping
@text = lines.map do |line|
item_number = line.match(/\A(\d+)\./)
if item_number.present?
list_item = true
"\n" + line + "[value:#{item_number[1]}]"
elsif line.match?(/\A[-*+]\s/)
list_item = true
"\n" + line
elsif line == ''
list_item = false
"\n" + line
elsif list_item
line
else
"\n" + line
end
end.join.lstrip
@renderer = Redcarpet::Markdown.new(
Redcarpet::BareRenderer.new(class_names_map: { list: 'fr-ol-content--override' }),
REDCARPET_EXTENSIONS.merge(autolink: @allow_a)
)
end
def autolink(text)
return text if !@allow_autolink
return text if @allow_a # already autolinked
text.gsub(SIMPLE_URL_REGEX) do |url|
helpers.link_to(ERB::Util.html_escape(url), ERB::Util.html_escape(url), title: helpers.new_tab_suffix(nil), **helpers.external_link_attributes)
end
end
def tags
if @allow_a
Rails.configuration.action_view.sanitized_allowed_tags + ['a']
else
Rails.configuration.action_view.sanitized_allowed_tags
end
end
def attributes
['target', 'rel', 'href', 'class', 'title', 'value']
end
end