Class: CanvasLinkMigrator::LinkReplacer

Inherits:
Object
  • Object
show all
Defined in:
lib/canvas_link_migrator/link_replacer.rb

Constant Summary collapse

HTML_ESCAPES = 
{ '"' => "&quot;", "<" => "&lt;", ">" => "&gt;" }.freeze
HTML_ESCAPE_RE = 
Regexp.union(HTML_ESCAPES.keys).freeze

Class Method Summary collapse

Class Method Details

.escape_url_for_html(value) ⇒ Object 



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# File 'lib/canvas_link_migrator/link_replacer.rb', line 25

def self.escape_url_for_html(value)
  value.to_s.gsub(HTML_ESCAPE_RE, HTML_ESCAPES)
end

.recursively_sub_placeholders!(object, links) ⇒ Object 



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# File 'lib/canvas_link_migrator/link_replacer.rb', line 57

def self.recursively_sub_placeholders!(object, links)
  subbed = false
  case object
  when Hash
    object.each_value { |o| subbed = true if recursively_sub_placeholders!(o, links) }
  when Array
    object.each { |o| subbed = true if recursively_sub_placeholders!(o, links) }
  when String
    subbed = sub_placeholders!(object, links)
  end
  subbed
end

.sub_placeholders!(html, links) ⇒ Object

returns false if no substitutions were made



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# File 'lib/canvas_link_migrator/link_replacer.rb', line 30

def self.sub_placeholders!(html, links)
  subbed = false
  media_links, other_links = links.partition { |l| l[:link_type] == :media_object }

  if media_links.any?
    by_placeholder = media_links.to_h { |l| [l[:placeholder], l] }
    if html.gsub!(Regexp.union(by_placeholder.keys)) { |m|
      link = by_placeholder[m]
      link[:replaced] = true
      link[:new_value] || link[:old_value]
    }
      subbed = true
    end
  end

  other_links.each do |link|
    new_value = link[:new_value] || link[:old_value]
    new_value = escape_url_for_html(new_value)
    if html.gsub!(link[:placeholder]) { new_value }
      link[:replaced] = true
      subbed = true
    end
  end

  subbed
end