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Edit File : pullparser.rb \| Size : 5.12 KB
# frozen_string_literal: false require 'forwardable' require_relative '../parseexception' require_relative 'baseparser' require_relative '../xmltokens' module REXML module Parsers # = Using the Pull Parser # <em>This API is experimental, and subject to change.</em> # 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. class PullParser include XMLTokens extend Forwardable def_delegators( :@parser, :has_next? ) def_delegators( :@parser, :entity ) def_delegators( :@parser, :empty? ) def_delegators( :@parser, :source ) def initialize stream @entities = {} @listeners = nil @parser = BaseParser.new( stream ) @my_stack = [] end def add_listener( listener ) @listeners = [] unless @listeners @listeners << listener end def each while has_next? yield self.pull end end 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 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 def unshift token @my_stack.unshift token end end # A parsing event. The contents of the event are accessed as an +Array?, # and the type is given either by the ...? methods, or by accessing the # +type+ accessor. The contents of this object vary from event to event, # but are identical to the arguments passed to +StreamListener+s for each # event. class PullEvent # The type of this event. Will be one of :tag_start, :tag_end, :text, # :processing_instruction, :comment, :doctype, :attlistdecl, :entitydecl, # :notationdecl, :entity, :cdata, :xmldecl, or :error. def initialize(arg) @contents = arg end def []( start, endd=nil) if start.kind_of? Range @contents.slice( start.begin+1 .. start.end ) elsif start.kind_of? Numeric if endd.nil? @contents.slice( start+1 ) else @contents.slice( start+1, endd ) end else raise "Illegal argument #{start.inspect} (#{start.class})" end end def event_type @contents[0] end # Content: [ String tag_name, Hash attributes ] def start_element? @contents[0] == :start_element end # Content: [ String tag_name ] def end_element? @contents[0] == :end_element end # Content: [ String raw_text, String unnormalized_text ] def text? @contents[0] == :text end # Content: [ String text ] def instruction? @contents[0] == :processing_instruction end # Content: [ String text ] def comment? @contents[0] == :comment end # Content: [ String name, String pub_sys, String long_name, String uri ] def doctype? @contents[0] == :start_doctype end # Content: [ String text ] def attlistdecl? @contents[0] == :attlistdecl end # Content: [ String text ] def elementdecl? @contents[0] == :elementdecl end # Due to the wonders of DTDs, an entity declaration can be just about # anything. There's no way to normalize it; you'll have to interpret the # content yourself. However, the following is true: # # * If the entity declaration is an internal entity: # [ String name, String value ] # Content: [ String text ] def entitydecl? @contents[0] == :entitydecl end # Content: [ String text ] def notationdecl? @contents[0] == :notationdecl end # Content: [ String text ] def entity? @contents[0] == :entity end # Content: [ String text ] def cdata? @contents[0] == :cdata end # Content: [ String version, String encoding, String standalone ] def xmldecl? @contents[0] == :xmldecl end def error? @contents[0] == :error end def inspect @contents[0].to_s + ": " + @contents[1..-1].inspect end end end end Back

Edit File : pullparser.rb | Size : 5.12 KB

# frozen_string_literal: false
require 'forwardable'

require_relative '../parseexception'
require_relative 'baseparser'
require_relative '../xmltokens'

module REXML
  module Parsers
    # = Using the Pull Parser
    # <em>This API is experimental, and subject to change.</em>
    #  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.
    class PullParser
      include XMLTokens
      extend Forwardable

def_delegators( :@parser, :has_next? )
      def_delegators( :@parser, :entity )
      def_delegators( :@parser, :empty? )
      def_delegators( :@parser, :source )

def initialize stream
        @entities = {}
        @listeners = nil
        @parser = BaseParser.new( stream )
        @my_stack = []
      end

def add_listener( listener )
        @listeners = [] unless @listeners
        @listeners << listener
      end

def each
        while has_next?
          yield self.pull
        end
      end

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

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

def unshift token
        @my_stack.unshift token
      end
    end

# A parsing event.  The contents of the event are accessed as an +Array?,
    # and the type is given either by the ...? methods, or by accessing the
    # +type+ accessor.  The contents of this object vary from event to event,
    # but are identical to the arguments passed to +StreamListener+s for each
    # event.
    class PullEvent
      # The type of this event.  Will be one of :tag_start, :tag_end, :text,
      # :processing_instruction, :comment, :doctype, :attlistdecl, :entitydecl,
      # :notationdecl, :entity, :cdata, :xmldecl, or :error.
      def initialize(arg)
        @contents = arg
      end

def []( start, endd=nil)
        if start.kind_of? Range
          @contents.slice( start.begin+1 .. start.end )
        elsif start.kind_of? Numeric
          if endd.nil?
            @contents.slice( start+1 )
          else
            @contents.slice( start+1, endd )
          end
        else
          raise "Illegal argument #{start.inspect} (#{start.class})"
        end
      end

def event_type
        @contents[0]
      end

# Content: [ String tag_name, Hash attributes ]
      def start_element?
        @contents[0] == :start_element
      end

# Content: [ String tag_name ]
      def end_element?
        @contents[0] == :end_element
      end

# Content: [ String raw_text, String unnormalized_text ]
      def text?
        @contents[0] == :text
      end

# Content: [ String text ]
      def instruction?
        @contents[0] == :processing_instruction
      end

# Content: [ String text ]
      def comment?
        @contents[0] == :comment
      end

# Content: [ String name, String pub_sys, String long_name, String uri ]
      def doctype?
        @contents[0] == :start_doctype
      end

# Content: [ String text ]
      def attlistdecl?
        @contents[0] == :attlistdecl
      end

# Content: [ String text ]
      def elementdecl?
        @contents[0] == :elementdecl
      end

# Due to the wonders of DTDs, an entity declaration can be just about
      # anything.  There's no way to normalize it; you'll have to interpret the
      # content yourself.  However, the following is true:
      #
      # * If the entity declaration is an internal entity:
      #   [ String name, String value ]
      # Content: [ String text ]
      def entitydecl?
        @contents[0] == :entitydecl
      end

# Content: [ String text ]
      def notationdecl?
        @contents[0] == :notationdecl
      end

# Content: [ String text ]
      def entity?
        @contents[0] == :entity
      end

# Content: [ String text ]
      def cdata?
        @contents[0] == :cdata
      end

# Content: [ String version, String encoding, String standalone ]
      def xmldecl?
        @contents[0] == :xmldecl
      end

def error?
        @contents[0] == :error
      end

def inspect
        @contents[0].to_s + ": " + @contents[1..-1].inspect
      end
    end
  end
end

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