Class: Markdiff::Differ

Inherits:
Object
  • Object
show all
Defined in:
lib/markdiff/differ.rb

Instance Method Summary collapse

Instance Method Details

#apply_patch(operations, node) ⇒ Nokogiri::XML::Node

Apply a given patch to a given node

Parameters:

Returns:

  • (Nokogiri::XML::Node) —

    Converted node



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# File 'lib/markdiff/differ.rb', line 16

def apply_patch(operations, node)
  i = 0
  operations.sort_by {|operation| i += 1; [-operation.priority, i] }.each do |operation|
    case operation
    when ::Markdiff::Operations::AddChildOperation
      operation.target_node.add_child(operation.inserted_node)
      mark_li_or_tr_as_changed(operation.target_node)
      mark_top_level_node_as_changed(operation.target_node)
    when ::Markdiff::Operations::AddDataBeforeHrefOperation
      operation.target_node["data-before-href"] = operation.target_node["href"]
      operation.target_node["href"] = operation.after_href
      mark_li_or_tr_as_changed(operation.target_node)
      mark_top_level_node_as_changed(operation.target_node)
    when ::Markdiff::Operations::AddDataBeforeTagNameOperation
      operation.target_node["data-before-tag-name"] = operation.target_node.name
      operation.target_node.name = operation.after_tag_name
      mark_li_or_tr_as_changed(operation.target_node)
      mark_top_level_node_as_changed(operation.target_node)
    when ::Markdiff::Operations::AddPreviousSiblingOperation
      operation.target_node.add_previous_sibling(operation.inserted_node)
      mark_li_or_tr_as_changed(operation.target_node) if operation.target_node.name != "li" && operation.target_node.name != "tr"
      mark_top_level_node_as_changed(operation.target_node.parent)
    when ::Markdiff::Operations::RemoveOperation
      operation.target_node.replace(operation.inserted_node) if operation.target_node != operation.inserted_node
      mark_li_or_tr_as_changed(operation.target_node)
      mark_top_level_node_as_changed(operation.target_node)
    when ::Markdiff::Operations::TextDiffOperation
      parent = operation.target_node.parent
      operation.target_node.replace(operation.inserted_node)
      mark_li_or_tr_as_changed(parent)
      mark_top_level_node_as_changed(parent)
    end
  end
  node
end

#create_patch(before_node, after_node) ⇒ Array<Markdiff::Operations::Base>

Creates a patch from given two nodes

Parameters:

  • before_node (Nokogiri::XML::Node)
  • after_node (Nokogiri::XML::Node)

Returns:



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# File 'lib/markdiff/differ.rb', line 56

def create_patch(before_node, after_node)
  if before_node.to_html == after_node.to_html
    []
  else
    create_patch_from_children(before_node, after_node)
  end
end

#render(before_string, after_string) ⇒ Nokogiri::XML::Node

Utility method to do both creating and applying a patch

Parameters:

  • before_string (String)
  • after_string (String)

Returns:

  • (Nokogiri::XML::Node) —

    Converted node



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# File 'lib/markdiff/differ.rb', line 68

def render(before_string, after_string)
  before_node = ::Nokogiri::HTML.fragment(before_string)
  after_node = ::Nokogiri::HTML.fragment(after_string)
  patch = create_patch(before_node, after_node)
  apply_patch(patch, before_node)
end