Class: Nice::HtmlParser

Inherits:
Object
  • Object
show all
Defined in:
lib/nice/html_parser.rb

Class Method Summary collapse

Class Method Details

.add_elements_of_current_state(doc, curr_state, upper_root = false) ⇒ Object 



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# File 'lib/nice/html_parser.rb', line 24

def self.add_elements_of_current_state doc, curr_state, upper_root=false

  # get all nodes of the current state      
   doc.css("*[data-state-root]").remove  if upper_root # for upper_root option remove tree below root to shorten the search
  curr_state_nodes = doc.css("[data-state~='#{curr_state}']")
  all_nodes = doc.css("[data-state~='all']")
  

  # get reference nodes in DOM tree for current nodes and generate js insert statements
  stack = curr_state_nodes.reverse.each_with_index.map do |curr_node,index|

     # in case this node is not only assigned to the current state - check if it should be updated
     if curr_node.attribute("data-state").value != curr_state &&
        !curr_node.has_attribute?("data-state-update") then
       next
     end

    ref_id = self.ref_node_uid( curr_state,curr_state_nodes.count - index)
    ref_node_name = "[data-state-uid~=\'#{ref_id}\']"       
    ref_node = doc.css(ref_node_name)
    
    if ref_node.blank?
      next
    end
    
    #get index
    idx = ref_node.attribute("data-state-uid").value.split(" ").find_index(ref_id)

    ref_node_method = ref_node.attribute('data-state-insert-method').value.split(" ")[idx]

    if ref_node_method == "insert"
      js_text = Nice::Js::Caller.generate_js_insert_after curr_node, ref_node_name
    else
      js_text = Nice::Js::Caller.generate_js_insert_inside curr_node, ref_node_name
    end

    # remove unuseful chars which will break the js parser
    js_text = js_text.gsub(/(\r\n|\n|\r|\t|\s\s)/,'')
  end
  
  # nodes with 'all' attribute
  stack += all_nodes.reverse.each_with_index.map do |curr_node,index|

     if !curr_node.has_attribute?("data-state-update") then
       next
     end

    ref_id = self.ref_node_uid( 'all',all_nodes.count - index)
    ref_node_name = "[data-state-uid~=\'#{ref_id}\']"       
    ref_node = doc.css(ref_node_name)
    
    if ref_node.blank?
      next
    end
    
    #get index
    idx = ref_node.attribute("data-state-uid").value.split(" ").find_index(ref_id)

    ref_node_method = ref_node.attribute('data-state-insert-method').value.split(" ")[idx]

    if ref_node_method == "insert"
      js_text = Nice::Js::Caller.generate_js_insert_after curr_node, ref_node_name
    else
      js_text = Nice::Js::Caller.generate_js_insert_inside curr_node, ref_node_name
    end

    # remove unuseful chars which will break the js parser
    js_text = js_text.gsub(/(\r\n|\n|\r|\t|\s\s)/,'')
  end      

  stack
end

.add_root_content(doc) ⇒ Object 



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# File 'lib/nice/html_parser.rb', line 164

def self.add_root_content doc
   if doc.css("[data-state-root]").length == 0
     raise "You must add add a data-state-root in your application.html to your main container"
   else
    ref_node_name = "[data-state-root]"
    js = []
    doc.css("*[data-state-root]").each do |curr_node|
      js << Nice::Js::Caller.replace_node(curr_node, ref_node_name).gsub(/(\r\n|\n|\r|\t|\s\s)/,'')
     end
     js
  end
end

.add_top_css(doc, current_state) ⇒ Object 



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# File 'lib/nice/html_parser.rb', line 159

def self.add_top_css doc, current_state
  doc.css("body").add_class("state-#{current_state}")
  doc
end

.annotate_referencing_nodes(doc) ⇒ Object

generates referencing data attributes in all preceiding or parent nodes of state bound elements which are used later to insert elements correctly This method supports referencing by more than one state bounded node



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# File 'lib/nice/html_parser.rb', line 100

def self.annotate_referencing_nodes doc

  per_state_counter = {}
  doc.css("[data-state]").each do |curr_node|
    
    # each node can have multiple state references which need to be
    # treated separately
    states = curr_node.attribute("data-state").value.split(" ")

    states.each do |state|
      # increase counter per state
      per_state_counter[state] ||= 0
      idx = per_state_counter[state] += 1

      # try using preceding element if one exists otherwise use parent.
      # the referencing node must not be an state bound element otherwise
      # we can not be sure the element is always present.
      prev_node = curr_node.previous_element

      while prev_node && prev_node.has_attribute?("data-state")
         prev_node = prev_node.previous_element
      end 

      if prev_node && !prev_node.has_attribute?("data-state")
        node = prev_node
        method = "insert" 
      else
        par_node = curr_node.parent
        
        while par_node && par_node.has_attribute?("data-state")
           par_node = par_node.parent
        end 

        if par_node && !par_node.has_attribute?("data-state")
          node = curr_node.parent
          method = "append"
        else
          raise "No reference could be created for node #{curr_node}. Make sure this node \
          is preceeded or sourrounded at least by one non state bound element."
        end
        
      end

      next if node == nil

      # add reference to the found element
      a = node.has_attribute?('data-state-uid') ? [node.attribute('data-state-uid').value] : []
  a += [self.ref_node_uid(state,idx)]
  node['data-state-uid'] = a.join(" ")

  m = node.has_attribute?('data-state-insert-method') ? [node.attribute('data-state-insert-method').value] : []
  m += [method]
  node['data-state-insert-method'] = m.join(" ")
end
  end

  doc
end

.remove_elements_not_of_state(state, doc) ⇒ Object 



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# File 'lib/nice/html_parser.rb', line 8

def self.remove_elements_not_of_state(state, doc)

  doc.css("[data-state]").each do |node|
    state_list = node.attribute('data-state').value.split(" ")

    if  !state_list.include?('all') &&
        !state_list.include?(state) then
      
      p "removed state: #{state_list}"            
      node.remove
    end
  end

  doc
end