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# frozen_string_literal: true
module Banzai
module Filter
# Using `[[_TOC_]]`, inserts a Table of Contents list.
# This syntax is based on the Gollum syntax. This way we have
# some consistency between with wiki and normal markdown.
# If there ever emerges a markdown standard, we can implement
# that here.
#
# The support for this has been removed from GollumTagsFilter
#
# Based on Banzai::Filter::GollumTagsFilter
class TableOfContentsTagFilter < HTML::Pipeline::Filter
TEXT_QUERY = %q(descendant-or-self::text()[ancestor::p and contains(., 'TOC')])
def call
return doc if context[:no_header_anchors]
doc.xpath(TEXT_QUERY).each do |node|
# A Gollum ToC tag is `[[_TOC_]]`, but due to MarkdownFilter running
# before this one, it will be converted into `[[<em>TOC</em>]]`, so it
# needs special-case handling
process_toc_tag(node) if toc_tag?(node)
end
doc
end
private
# Replace an entire `[[<em>TOC</em>]]` node with the result generated by
# TableOfContentsFilter
def process_toc_tag(node)
node.parent.parent.replace(result[:toc].presence || '')
end
def toc_tag?(node)
node.content == 'TOC' &&
node.parent.name == 'em' &&
node.parent.parent.text == '[[TOC]]'
end
end
end
end
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