Class: Banzai::Filter::SpacedLinkFilter

Inherits:
HTML::Pipeline::Filter
  • Object
show all
Includes:
ActionView::Helpers::TagHelper
Defined in:
lib/banzai/filter/spaced_link_filter.rb

Overview

HTML Filter for markdown links with spaces in the URLs

Based on Banzai::Filter::AutolinkFilter

CommonMark does not allow spaces in the url portion of a link/url. For example, `[example](page slug)` is not valid. Neither is `![example](test image.jpg)`. However, particularly in our wikis, we support (via RedCarpet) this type of link, allowing wiki pages to be easily linked by their title. This filter adds that functionality.

This is a small extension to the CommonMark spec. If they start allowing spaces in urls, we could then remove this filter.

Note: Filter::SanitizationFilter should always be run sometime after this filter to prevent XSS attacks

Constant Summary collapse 

%r{
  (?<preview_operator>!)?
  \[(?<text>.+?)\]
  \(
    (?<new_link>.+?)
    (?<title>\ ".+?")?
  \)
}x.freeze
IGNORE_PARENTS =

Text matching LINK_OR_IMAGE_PATTERN inside these elements will not be linked

%w(a code kbd pre script style).to_set
TEXT_QUERY =

The XPath query to use for finding text nodes to parse.

%Q(descendant-or-self::text()[
  not(#{IGNORE_PARENTS.map { |p| "ancestor::#{p}" }.join(' or ')})
  and contains(., ']\(')
]).freeze

Instance Method Summary collapse

Instance Method Details

#call ⇒ Object 


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# File 'lib/banzai/filter/spaced_link_filter.rb', line 47

def call
  doc.xpath(TEXT_QUERY).each do |node|
    content = node.to_html

    next unless content.match(LINK_OR_IMAGE_PATTERN)

    html = spaced_link_filter(content)

    next if html == content

    node.replace(html)
  end

  doc
end