require 'rexml/document' require 'rexml/streamlistener' require 'nitro/element' require "glue/html" module Nitro # A compiler that handles the processing of Elements class Elements # :nodoc: all class Listener # :nodoc: all include REXML::StreamListener attr_accessor :buffer attr_accessor :stack def initialize super @buffer = '' @stack = [] end PREFIX_RE = /^#{Element.prefix}:/ CAPITALIZED_RE = /^[A-Z]/ def tag_start(name, attributes) # check if the name starts with the element prefix, or # is capitalized. if name =~ PREFIX_RE or name =~ CAPITALIZED_RE name = name.split(':')[1].camelize if name =~ PREFIX_RE # First try to use Nitro::Element::xxx then ::xxx if klass = Nitro::Element.const_get(name) || Object.const_get(name) unless klass.ancestors.include? Nitro::Element if Element.auto_extend klass.send(:include, Nitro::ElementMixin) else Logger.error "Invalid element class '#{name}', does not extend Nitro::Element" end end else Logger.error "The class of this element tag '#{name}' does not exist" end if klass and obj = klass.new attributes.each do | k, v | obj.instance_variable_set("@#{k}", v) end @stack.push [obj, @buffer, @parent] @buffer = obj._text @parent.add_child(obj) if @parent @parent = obj end else # This is a static element. attrs = [] attributes.each do | k, v | attrs << %|#{k}="#{v}"| end attrs = attrs.empty? ? nil : " #{attrs.join(' ')}" @buffer << "<#{name}#{attrs}>" end end def tag_end(name) # check if the name starts with the element prefix, or # is capitalized. if name =~ PREFIX_RE or name =~ CAPITALIZED_RE name = name.split(':')[1].camelize if name =~ PREFIX_RE obj, @buffer, @parent = @stack.pop @buffer << obj.render else @buffer << "</#{name}>" end end def text(str) @buffer << str end def instruction(name, attributes) @buffer << "<?#{name}#{attributes}?>" end def comment(c) unless Template.strip_xml_comments @buffer << "<!--#{c}-->" end end end class << self def parse(source) self.new.parse(source) end def transform(source, compiler) self.new.transform(source, compiler) end end # Expand the elemens found in source. #-- # gmosx, FIXME: optimize this, how? # gmosx, FIXME: this is a hack fix, improve. # TODO:farms why is cleanup called this many times?!?!? ... waste of gsubs #++ def transform(source, compiler) listener = Listener.new REXML::Document.parse_stream(source, listener) return listener.buffer end end # An (old) alias. unless const_defined? :ElementProcessor ElementProcessor = Elements ElementCompiler = Elements end end # * George Moschovitis <gm@navel.gr> # * Chris Farmiloe <chris.farmiloe@farmiloe.com>