module Phlex::Elements

def register_element(method_name, tag: method_name.name.tr("_", "-"), deprecated: false)
	if deprecated
		deprecation = <<~RUBY
			Kernel.warn "#{deprecated}"
		RUBY
	else
		deprecation = ""
	end
	class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
		# frozen_string_literal: true
		def #{method_name}(**attributes, &block)
			#{deprecation}
			context = @_context
			buffer = context.buffer
			fragment = context.fragments
			target_found = false
			if fragment
				return if fragment.length == 0 # we found all our fragments already
				id = attributes[:id]
				if !context.in_target_fragment
				  if fragment[id]
						context.begin_target(id)
						target_found = true
					else
						yield(self) if block
						return nil
					end
				end
			end
			if attributes.length > 0 # with attributes
				if block # with content block
					buffer << "<#{tag}" << (Phlex::ATTRIBUTE_CACHE[respond_to?(:process_attributes) ? (attributes.hash + self.class.hash) : attributes.hash] || __attributes__(**attributes)) << ">"
					yield_content(&block)
					buffer << "</#{tag}>"
				else # without content block
					buffer << "<#{tag}" << (Phlex::ATTRIBUTE_CACHE[respond_to?(:process_attributes) ? (attributes.hash + self.class.hash) : attributes.hash] || __attributes__(**attributes)) << "></#{tag}>"
				end
			else # without attributes
				if block # with content block
					buffer << "<#{tag}>"
					yield_content(&block)
					buffer << "</#{tag}>"
				else # without content block
					buffer << "<#{tag}></#{tag}>"
				end
			end
			#{'flush' if tag == 'head'}
			context.end_target if target_found
			nil
		end
		alias_method :_#{method_name}, :#{method_name}
	RUBY
	registered_elements[method_name] = tag
	method_name
end

def register_void_element(method_name, tag: method_name.name.tr("_", "-"), deprecated: false)
	if deprecated
		deprecation = <<~RUBY
			Kernel.warn "#{deprecated}"
		RUBY
	else
		deprecation = ""
	end
	class_eval(<<-RUBY, __FILE__, __LINE__ + 1)
		# frozen_string_literal: true
		def #{method_name}(**attributes)
			#{deprecation}
			context = @_context
			buffer = context.buffer
			fragment = context.fragments
			if fragment
				return if fragment.length == 0 # we found all our fragments already
				id = attributes[:id]
				if !context.in_target_fragment
				  if fragment[id]
						context.begin_target(id)
						target_found = true
					else
						return nil
					end
				end
			end
			if attributes.length > 0 # with attributes
				buffer << "<#{tag}" << (Phlex::ATTRIBUTE_CACHE[respond_to?(:process_attributes) ? (attributes.hash + self.class.hash) : attributes.hash] || __attributes__(**attributes)) << ">"
			else # without attributes
				buffer << "<#{tag}>"
			end
			context.end_target if target_found
			nil
		end
		alias_method :_#{method_name}, :#{method_name}
	RUBY
	registered_elements[method_name] = tag
	method_name
end

def registered_elements
	@registered_elements ||= {}
end