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# frozen_string_literal: true
module Banzai
module Filter
# HTML filter that inserts a node for each occurence of
# a given link format. To transform references to DB
# resources in place, prefer to inherit from AbstractReferenceFilter.
class InlineEmbedsFilter < HTML::Pipeline::Filter
# Find every relevant link, create a new node based on
# the link, and insert this node after any html content
# surrounding the link.
def call
doc.xpath(xpath_search).each do |node|
next unless element = element_to_embed(node)
# We want this to follow any surrounding content. For example,
# if a link is inline in a paragraph.
node.parent.children.last.add_next_sibling(element)
end
doc
end
# Implement in child class.
#
# Return a Nokogiri::XML::Element to embed in the
# markdown.
def create_element(params)
end
# Implement in child class unless overriding #embed_params
#
# Returns the regex pattern used to filter
# to only matching urls.
def link_pattern
end
# Returns the xpath query string used to select nodes
# from the html document on which the embed is based.
#
# Override to select nodes other than links.
def xpath_search
'descendant-or-self::a[@href]'
end
# Creates a new element based on the parameters
# obtained from the target link
def element_to_embed(node)
return unless params = embed_params(node)
create_element(params)
end
# Returns a hash of named parameters based on the
# provided regex with string keys.
#
# Override to select nodes other than links.
def embed_params(node)
url = node['href']
link_pattern.match(url) { |m| m.named_captures }
end
end
end
end
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