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