| In: |
rexml/parsers/sax2parser.rb
|
| Parent: | Object |
# File rexml/parsers/sax2parser.rb, line 8 def initialize source @parser = BaseParser.new(source) @listeners = [] @procs = [] @namespace_stack = [] @has_listeners = false @tag_stack = [] end
# File rexml/parsers/sax2parser.rb, line 61 def deafen( listener=nil, &blok ) if listener @listeners.delete_if {|item| item[-1] == listener } @has_listeners = false if @listeners.size == 0 else @procs.delete_if {|item| item[-1] == blok } end end
Listen arguments:
Symbol, Array, Block
Listen to Symbol events on Array elements
Symbol, Block
Listen to Symbol events
Array, Listener
Listen to all events on Array elements
Array, Block
Listen to :start_element events on Array elements
Listener
Listen to All events
Symbol can be one of: :start_element, :end_element, :start_prefix_mapping, :end_prefix_mapping, :characters, :processing_instruction, :doctype, :attlistdecl, :elementdecl, :entitydecl, :notationdecl, :cdata, :xmldecl, :comment
Array contains regular expressions or strings which will be matched against fully qualified element names.
Listener must implement the methods in SAX2Listener
Block will be passed the same arguments as a SAX2Listener method would be, where the method name is the same as the matched Symbol. See the SAX2Listener for more information.
# File rexml/parsers/sax2parser.rb, line 43 def listen( *args, &blok ) if args[0].kind_of? Symbol if args.size == 2 args[1].each { |match| @procs << [args[0], match, blok] } else add( [args[0], nil, blok] ) end elsif args[0].kind_of? Array if args.size == 2 args[0].each { |match| add( [nil, match, args[1]] ) } else args[0].each { |match| add( [ :start_element, match, blok ] ) } end else add([nil, nil, args[0]]) end end
# File rexml/parsers/sax2parser.rb, line 70 def parse @procs.each { |sym,match,block| block.call if sym == :start_document } @listeners.each { |sym,match,block| block.start_document if sym == :start_document or sym.nil? } root = context = [] while true event = @parser.pull case event[0] when :end_document handle( :end_document ) break when :end_doctype context = context[1] when :start_element @tag_stack.push(event[1]) # find the observers for namespaces procs = get_procs( :start_prefix_mapping, event[1] ) listeners = get_listeners( :start_prefix_mapping, event[1] ) if procs or listeners # break out the namespace declarations # The attributes live in event[2] nsdecl = event[2].find_all { |n, value| n =~ /^xmlns(:|$)/ } nsdecl.collect! { |n, value| [ n[6..-1], value ] } @namespace_stack.push({}) nsdecl.each do |n,v| @namespace_stack[-1][n] = v # notify observers of namespaces procs.each { |ob| ob.call( n, v ) } if procs listeners.each { |ob| ob.start_prefix_mapping(n, v) } if listeners end end event[1] =~ Namespace::NAMESPLIT prefix = $1 local = $2 uri = get_namespace(prefix) # find the observers for start_element procs = get_procs( :start_element, event[1] ) listeners = get_listeners( :start_element, event[1] ) # notify observers procs.each { |ob| ob.call( uri, local, event[1], event[2] ) } if procs listeners.each { |ob| ob.start_element( uri, local, event[1], event[2] ) } if listeners when :end_element @tag_stack.pop event[1] =~ Namespace::NAMESPLIT prefix = $1 local = $2 uri = get_namespace(prefix) # find the observers for start_element procs = get_procs( :end_element, event[1] ) listeners = get_listeners( :end_element, event[1] ) # notify observers procs.each { |ob| ob.call( uri, local, event[1] ) } if procs listeners.each { |ob| ob.end_element( uri, local, event[1] ) } if listeners namespace_mapping = @namespace_stack.pop # find the observers for namespaces procs = get_procs( :end_prefix_mapping, event[1] ) listeners = get_listeners( :end_prefix_mapping, event[1] ) if procs or listeners namespace_mapping.each do |prefix, uri| # notify observers of namespaces procs.each { |ob| ob.call( prefix ) } if procs listeners.each { |ob| ob.end_prefix_mapping(prefix) } if listeners end end when :text normalized = @parser.normalize( event[1] ) handle( :characters, normalized ) when :processing_instruction, :comment, :doctype, :attlistdecl, :elementdecl, :entitydecl, :cdata, :notationdecl, :xmldecl handle( *event ) end end end