class REXML::Parsers::PullParser

Using the Pull Parser¶ ↑

This API is experimental, and subject to change.

parser = PullParser.new( "<a>text<b att='val'/>txet</a>" )
while parser.has_next?
  res = parser.next
  puts res[1]['att'] if res.start_tag? and res[0] == 'b'
end

See the PullEvent class for information on the content of the results. The data is identical to the arguments passed for the various events to the StreamListener API.

Notice that:

parser = PullParser.new( "<a>BAD DOCUMENT" )
while parser.has_next?
  res = parser.next
  raise res[1] if res.error?
end

Nat Price gave me some good ideas for the API.

Public Class Methods

new(stream) click to toggle source

# File rexml/parsers/pullparser.rb, line 38
def initialize stream
  @entities = {}
  @listeners = nil
  @parser = BaseParser.new( stream )
  @my_stack = []
end

Public Instance Methods

add_listener( listener ) click to toggle source

# File rexml/parsers/pullparser.rb, line 45
def add_listener( listener )
  @listeners = [] unless @listeners
  @listeners << listener
end

each() { |pull| ... } click to toggle source

# File rexml/parsers/pullparser.rb, line 50
def each
  while has_next?
    yield self.pull
  end
end

peek(depth=0) click to toggle source

# File rexml/parsers/pullparser.rb, line 56
def peek depth=0
  if @my_stack.length <= depth
    (depth - @my_stack.length + 1).times {
      e = PullEvent.new(@parser.pull)
      @my_stack.push(e)
    }
  end
  @my_stack[depth]
end

pull() click to toggle source

# File rexml/parsers/pullparser.rb, line 66
def pull
  return @my_stack.shift if @my_stack.length > 0

  event = @parser.pull
  case event[0]
  when :entitydecl
    @entities[ event[1] ] =
      event[2] unless event[2] =~ /PUBLIC|SYSTEM/
  when :text
    unnormalized = @parser.unnormalize( event[1], @entities )
    event << unnormalized
  end
  PullEvent.new( event )
end

unshift(token) click to toggle source

# File rexml/parsers/pullparser.rb, line 81
def unshift token
  @my_stack.unshift token
end