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Edit File : text.rb \| Size : 11.15 KB
require 'rexml/rexml' require 'rexml/entity' require 'rexml/doctype' require 'rexml/child' require 'rexml/doctype' require 'rexml/parseexception' module REXML # Represents text nodes in an XML document class Text < Child include Comparable # The order in which the substitutions occur SPECIALS = [ /&(?!#?[\w-]+;)/u, /</u, />/u, /"/u, /'/u, /\r/u ] SUBSTITUTES = ['&', '<', '>', '"', ''', ' '] # Characters which are substituted in written strings SLAICEPS = [ '<', '>', '"', "'", '&' ] SETUTITSBUS = [ /</u, />/u, /"/u, /'/u, /&/u ] # If +raw+ is true, then REXML leaves the value alone attr_accessor :raw ILLEGAL = /(<\|&(?!(#{Entity::NAME})\|(#0((?:\d+)\|(?:x[a-fA-F0-9]+)));))/um NUMERICENTITY = /&#0((?:\d+)\|(?:x[a-fA-F0-9]+));/ # Constructor # +arg+ if a String, the content is set to the String. If a Text, # the object is shallowly cloned. # # +respect_whitespace+ (boolean, false) if true, whitespace is # respected # # +parent+ (nil) if this is a Parent object, the parent # will be set to this. # # +raw+ (nil) This argument can be given three values. # If true, then the value of used to construct this object is expected to # contain no unescaped XML markup, and REXML will not change the text. If # this value is false, the string may contain any characters, and REXML will # escape any and all defined entities whose values are contained in the # text. If this value is nil (the default), then the raw value of the # parent will be used as the raw value for this node. If there is no raw # value for the parent, and no value is supplied, the default is false. # Use this field if you have entities defined for some text, and you don't # want REXML to escape that text in output. # Text.new( "<&", false, nil, false ) #-> "<&" # Text.new( "<&", false, nil, false ) #-> "&lt;&amp;" # Text.new( "<&", false, nil, true ) #-> Parse exception # Text.new( "<&", false, nil, true ) #-> "<&" # # Assume that the entity "s" is defined to be "sean" # # and that the entity "r" is defined to be "russell" # Text.new( "sean russell" ) #-> "&s; &r;" # Text.new( "sean russell", false, nil, true ) #-> "sean russell" # # +entity_filter+ (nil) This can be an array of entities to match in the # supplied text. This argument is only useful if +raw+ is set to false. # Text.new( "sean russell", false, nil, false, ["s"] ) #-> "&s; russell" # Text.new( "sean russell", false, nil, true, ["s"] ) #-> "sean russell" # In the last example, the +entity_filter+ argument is ignored. # # +pattern+ INTERNAL USE ONLY def initialize(arg, respect_whitespace=false, parent=nil, raw=nil, entity_filter=nil, illegal=ILLEGAL ) @raw = false if parent super( parent ) @raw = parent.raw else @parent = nil end @raw = raw unless raw.nil? @entity_filter = entity_filter @normalized = @unnormalized = nil if arg.kind_of? String @string = arg.clone @string.squeeze!(" \n\t") unless respect_whitespace elsif arg.kind_of? Text @string = arg.to_s @raw = arg.raw elsif raise "Illegal argument of type #{arg.type} for Text constructor (#{arg})" end @string.gsub!( /\r\n?/, "\n" ) # check for illegal characters if @raw if @string =~ illegal raise "Illegal character '#{$1}' in raw string \"#{@string}\"" end end end def node_type :text end def empty? @string.size==0 end def clone return Text.new(self) end # Appends text to this text node. The text is appended in the +raw+ mode # of this text node. def <<( to_append ) @string << to_append.gsub( /\r\n?/, "\n" ) end # +other+ a String or a Text # +returns+ the result of (to_s <=> arg.to_s) def <=>( other ) to_s() <=> other.to_s end REFERENCE = /#{Entity::REFERENCE}/ # Returns the string value of this text node. This string is always # escaped, meaning that it is a valid XML text node string, and all # entities that can be escaped, have been inserted. This method respects # the entity filter set in the constructor. # # # Assume that the entity "s" is defined to be "sean", and that the # # entity "r" is defined to be "russell" # t = Text.new( "< & sean russell", false, nil, false, ['s'] ) # t.to_s #-> "< & &s; russell" # t = Text.new( "< & &s; russell", false, nil, false ) # t.to_s #-> "< & &s; russell" # u = Text.new( "sean russell", false, nil, true ) # u.to_s #-> "sean russell" def to_s return @string if @raw return @normalized if @normalized doctype = nil if @parent doc = @parent.document doctype = doc.doctype if doc end @normalized = Text::normalize( @string, doctype, @entity_filter ) end def inspect @string.inspect end # Returns the string value of this text. This is the text without # entities, as it might be used programmatically, or printed to the # console. This ignores the 'raw' attribute setting, and any # entity_filter. # # # Assume that the entity "s" is defined to be "sean", and that the # # entity "r" is defined to be "russell" # t = Text.new( "< & sean russell", false, nil, false, ['s'] ) # t.value #-> "< & sean russell" # t = Text.new( "< & &s; russell", false, nil, false ) # t.value #-> "< & sean russell" # u = Text.new( "sean russell", false, nil, true ) # u.value #-> "sean russell" def value @unnormalized if @unnormalized doctype = nil if @parent doc = @parent.document doctype = doc.doctype if doc end @unnormalized = Text::unnormalize( @string, doctype ) end # Sets the contents of this text node. This expects the text to be # unnormalized. It returns self. # # e = Element.new( "a" ) # e.add_text( "foo" ) # <a>foo</a> # e[0].value = "bar" # <a>bar</a> # e[0].value = "<a>" # <a><a></a> def value=( val ) @string = val.gsub( /\r\n?/, "\n" ) @unnormalized = nil @normalized = nil @raw = false end def wrap(string, width, addnewline=false) # Recursively wrap string at width. return string if string.length <= width place = string.rindex(' ', width) # Position in string with last ' ' before cutoff if addnewline then return "\n" + string[0,place] + "\n" + wrap(string[place+1..-1], width) else return string[0,place] + "\n" + wrap(string[place+1..-1], width) end end def indent_text(string, level=1, style="\t", indentfirstline=true) return string if level < 0 new_string = '' string.each { \|line\| indent_string = style * level new_line = (indent_string + line).sub(/[\s]+$/,'') new_string << new_line } new_string.strip! unless indentfirstline return new_string end # == DEPRECATED # See REXML::Formatters # def write( writer, indent=-1, transitive=false, ie_hack=false ) Kernel.warn("#{self.class.name}.write is deprecated. See REXML::Formatters") formatter = if indent > -1 REXML::Formatters::Pretty.new( indent ) else REXML::Formatters::Default.new end formatter.write( self, writer ) end # FIXME # This probably won't work properly def xpath path = @parent.xpath path += "/text()" return path end # Writes out text, substituting special characters beforehand. # +out+ A String, IO, or any other object supporting <<( String ) # +input+ the text to substitute and the write out # # z=utf8.unpack("U") # ascOut="" # z.each{\|r\| # if r < 0x100 # ascOut.concat(r.chr) # else # ascOut.concat(sprintf("&#x%x;", r)) # end # } # puts ascOut def write_with_substitution out, input copy = input.clone # Doing it like this rather than in a loop improves the speed copy.gsub!( SPECIALS[0], SUBSTITUTES[0] ) copy.gsub!( SPECIALS[1], SUBSTITUTES[1] ) copy.gsub!( SPECIALS[2], SUBSTITUTES[2] ) copy.gsub!( SPECIALS[3], SUBSTITUTES[3] ) copy.gsub!( SPECIALS[4], SUBSTITUTES[4] ) copy.gsub!( SPECIALS[5], SUBSTITUTES[5] ) out << copy end # Reads text, substituting entities def Text::read_with_substitution( input, illegal=nil ) copy = input.clone if copy =~ illegal raise ParseException.new( "malformed text: Illegal character #$& in \"#{copy}\"" ) end if illegal copy.gsub!( /\r\n?/, "\n" ) if copy.include? ?& copy.gsub!( SETUTITSBUS[0], SLAICEPS[0] ) copy.gsub!( SETUTITSBUS[1], SLAICEPS[1] ) copy.gsub!( SETUTITSBUS[2], SLAICEPS[2] ) copy.gsub!( SETUTITSBUS[3], SLAICEPS[3] ) copy.gsub!( SETUTITSBUS[4], SLAICEPS[4] ) copy.gsub!( /&#0((?:\d+)\|(?:x[a-f0-9]+));/ ) {\|m\| m=$1 #m='0' if m=='' m = "0#{m}" if m[0] == ?x [Integer(m)].pack('U') } end copy end EREFERENCE = /&(?!#{Entity::NAME};)/ # Escapes all possible entities def Text::normalize( input, doctype=nil, entity_filter=nil ) copy = input.to_s # Doing it like this rather than in a loop improves the speed #copy = copy.gsub( EREFERENCE, '&' ) copy = copy.gsub( "&", "&" ) if doctype # Replace all ampersands that aren't part of an entity doctype.entities.each_value do \|entity\| copy = copy.gsub( entity.value, "&#{entity.name};" ) if entity.value and not( entity_filter and entity_filter.include?(entity) ) end else # Replace all ampersands that aren't part of an entity DocType::DEFAULT_ENTITIES.each_value do \|entity\| copy = copy.gsub(entity.value, "&#{entity.name};" ) end end copy end # Unescapes all possible entities def Text::unnormalize( string, doctype=nil, filter=nil, illegal=nil ) sum = 0 string.gsub( /\r\n?/, "\n" ).gsub( REFERENCE ) { s = Text.expand($&, doctype, filter) if sum + s.bytesize > REXML.entity_expansion_text_limit raise "entity expansion has grown too large" else sum += s.bytesize end s } end def Text.expand(ref, doctype, filter) if ref[1] == ?# if ref[2] == ?x [ref[3...-1].to_i(16)].pack('U') else [ref[2...-1].to_i].pack('U*') end elsif ref == '&' '&' elsif filter and filter.include?( ref[1...-1] ) ref elsif doctype doctype.entity( ref[1...-1] ) or ref else entity_value = DocType::DEFAULT_ENTITIES[ ref[1...-1] ] entity_value ? entity_value.value : ref end end end end Back

Edit File : text.rb | Size : 11.15 KB

require 'rexml/rexml'
require 'rexml/entity'
require 'rexml/doctype'
require 'rexml/child'
require 'rexml/doctype'
require 'rexml/parseexception'

module REXML
  # Represents text nodes in an XML document
  class Text < Child
    include Comparable
    # The order in which the substitutions occur
    SPECIALS = [ /&(?!#?[\w-]+;)/u, /</u, />/u, /"/u, /'/u, /\r/u ]
    SUBSTITUTES = ['&amp;', '&lt;', '&gt;', '&quot;', '&apos;', '&#13;']
    # Characters which are substituted in written strings
    SLAICEPS = [ '<', '>', '"', "'", '&' ]
    SETUTITSBUS = [ /&lt;/u, /&gt;/u, /&quot;/u, /&apos;/u, /&amp;/u ]

# If +raw+ is true, then REXML leaves the value alone
    attr_accessor :raw

ILLEGAL = /(<|&(?!(#{Entity::NAME})|(#0*((?:\d+)|(?:x[a-fA-F0-9]+)));))/um
    NUMERICENTITY = /&#0*((?:\d+)|(?:x[a-fA-F0-9]+));/

# Constructor
    # +arg+ if a String, the content is set to the String.  If a Text,
    # the object is shallowly cloned.  
    #
    # +respect_whitespace+ (boolean, false) if true, whitespace is
    # respected
    #
    # +parent+ (nil) if this is a Parent object, the parent
    # will be set to this.  
    #
    # +raw+ (nil) This argument can be given three values.
    # If true, then the value of used to construct this object is expected to 
    # contain no unescaped XML markup, and REXML will not change the text. If 
    # this value is false, the string may contain any characters, and REXML will
    # escape any and all defined entities whose values are contained in the
    # text.  If this value is nil (the default), then the raw value of the 
    # parent will be used as the raw value for this node.  If there is no raw
    # value for the parent, and no value is supplied, the default is false.
    # Use this field if you have entities defined for some text, and you don't
    # want REXML to escape that text in output.
    #   Text.new( "<&", false, nil, false ) #-> "&lt;&amp;"
    #   Text.new( "&lt;&amp;", false, nil, false ) #-> "&amp;lt;&amp;amp;"
    #   Text.new( "<&", false, nil, true )  #-> Parse exception
    #   Text.new( "&lt;&amp;", false, nil, true )  #-> "&lt;&amp;"
    #   # Assume that the entity "s" is defined to be "sean"
    #   # and that the entity    "r" is defined to be "russell"
    #   Text.new( "sean russell" )          #-> "&s; &r;"
    #   Text.new( "sean russell", false, nil, true ) #-> "sean russell"
    #
    # +entity_filter+ (nil) This can be an array of entities to match in the
    # supplied text.  This argument is only useful if +raw+ is set to false.
    #   Text.new( "sean russell", false, nil, false, ["s"] ) #-> "&s; russell"
    #   Text.new( "sean russell", false, nil, true, ["s"] ) #-> "sean russell"
    # In the last example, the +entity_filter+ argument is ignored.
    #
    # +pattern+ INTERNAL USE ONLY
    def initialize(arg, respect_whitespace=false, parent=nil, raw=nil, 
      entity_filter=nil, illegal=ILLEGAL )

@raw = false

if parent
        super( parent )
        @raw = parent.raw 
      else
        @parent = nil
      end

@raw = raw unless raw.nil?
      @entity_filter = entity_filter
      @normalized = @unnormalized = nil

if arg.kind_of? String
        @string = arg.clone
        @string.squeeze!(" \n\t") unless respect_whitespace
      elsif arg.kind_of? Text
        @string = arg.to_s
        @raw = arg.raw
      elsif
        raise "Illegal argument of type #{arg.type} for Text constructor (#{arg})"
      end

@string.gsub!( /\r\n?/, "\n" )

# check for illegal characters
      if @raw
        if @string =~ illegal
          raise "Illegal character '#{$1}' in raw string \"#{@string}\""
        end
      end
    end

def node_type
      :text
    end

def empty?
      @string.size==0
    end

def clone
      return Text.new(self)
    end

# Appends text to this text node.  The text is appended in the +raw+ mode
    # of this text node.
    def <<( to_append )
      @string << to_append.gsub( /\r\n?/, "\n" )
    end

# +other+ a String or a Text
    # +returns+ the result of (to_s <=> arg.to_s)
    def <=>( other )
      to_s() <=> other.to_s
    end

REFERENCE = /#{Entity::REFERENCE}/
    # Returns the string value of this text node.  This string is always
    # escaped, meaning that it is a valid XML text node string, and all
    # entities that can be escaped, have been inserted.  This method respects
    # the entity filter set in the constructor.
    #   
    #   # Assume that the entity "s" is defined to be "sean", and that the 
    #   # entity "r" is defined to be "russell"
    #   t = Text.new( "< & sean russell", false, nil, false, ['s'] ) 
    #   t.to_s   #-> "&lt; &amp; &s; russell"
    #   t = Text.new( "< & &s; russell", false, nil, false ) 
    #   t.to_s   #-> "&lt; &amp; &s; russell"
    #   u = Text.new( "sean russell", false, nil, true )
    #   u.to_s   #-> "sean russell"
    def to_s
      return @string if @raw
      return @normalized if @normalized

doctype = nil
      if @parent
        doc = @parent.document
        doctype = doc.doctype if doc
      end

@normalized = Text::normalize( @string, doctype, @entity_filter )
    end

def inspect
      @string.inspect
    end

# Returns the string value of this text.  This is the text without
    # entities, as it might be used programmatically, or printed to the
    # console.  This ignores the 'raw' attribute setting, and any
    # entity_filter.
    #
    #   # Assume that the entity "s" is defined to be "sean", and that the 
    #   # entity "r" is defined to be "russell"
    #   t = Text.new( "< & sean russell", false, nil, false, ['s'] ) 
    #   t.value   #-> "< & sean russell"
    #   t = Text.new( "< & &s; russell", false, nil, false )
    #   t.value   #-> "< & sean russell"
    #   u = Text.new( "sean russell", false, nil, true )
    #   u.value   #-> "sean russell"
    def value
      @unnormalized if @unnormalized
      doctype = nil
      if @parent
        doc = @parent.document
        doctype = doc.doctype if doc
      end
      @unnormalized = Text::unnormalize( @string, doctype )
    end

# Sets the contents of this text node.  This expects the text to be 
    # unnormalized.  It returns self.
    #
    #   e = Element.new( "a" )
    #   e.add_text( "foo" )   # <a>foo</a>
    #   e[0].value = "bar"    # <a>bar</a>
    #   e[0].value = "<a>"    # <a>&lt;a&gt;</a>
    def value=( val )
      @string = val.gsub( /\r\n?/, "\n" )
      @unnormalized = nil
      @normalized = nil
      @raw = false
    end
 
     def wrap(string, width, addnewline=false)
       # Recursively wrap string at width.
       return string if string.length <= width
       place = string.rindex(' ', width) # Position in string with last ' ' before cutoff
       if addnewline then
         return "\n" + string[0,place] + "\n" + wrap(string[place+1..-1], width)
       else
         return string[0,place] + "\n" + wrap(string[place+1..-1], width)
       end
     end

def indent_text(string, level=1, style="\t", indentfirstline=true)
      return string if level < 0
      new_string = ''
      string.each { |line|
        indent_string = style * level
        new_line = (indent_string + line).sub(/[\s]+$/,'')
        new_string << new_line
      }
      new_string.strip! unless indentfirstline
      return new_string
    end
 
    # == DEPRECATED
    # See REXML::Formatters
    #
    def write( writer, indent=-1, transitive=false, ie_hack=false ) 
      Kernel.warn("#{self.class.name}.write is deprecated.  See REXML::Formatters")
      formatter = if indent > -1
          REXML::Formatters::Pretty.new( indent )
        else
          REXML::Formatters::Default.new
        end
      formatter.write( self, writer )
    end

# FIXME
    # This probably won't work properly
    def xpath
      path = @parent.xpath
      path += "/text()"
      return path
    end

# Writes out text, substituting special characters beforehand.
    # +out+ A String, IO, or any other object supporting <<( String )
    # +input+ the text to substitute and the write out
    #
    #   z=utf8.unpack("U*")
    #   ascOut=""
    #   z.each{|r|
    #     if r <  0x100
    #       ascOut.concat(r.chr)
    #     else
    #       ascOut.concat(sprintf("&#x%x;", r))
    #     end
    #   }
    #   puts ascOut
    def write_with_substitution out, input
      copy = input.clone
      # Doing it like this rather than in a loop improves the speed
      copy.gsub!( SPECIALS[0], SUBSTITUTES[0] )
      copy.gsub!( SPECIALS[1], SUBSTITUTES[1] )
      copy.gsub!( SPECIALS[2], SUBSTITUTES[2] )
      copy.gsub!( SPECIALS[3], SUBSTITUTES[3] )
      copy.gsub!( SPECIALS[4], SUBSTITUTES[4] )
      copy.gsub!( SPECIALS[5], SUBSTITUTES[5] )
      out << copy
    end

# Reads text, substituting entities
    def Text::read_with_substitution( input, illegal=nil )
      copy = input.clone

if copy =~ illegal
        raise ParseException.new( "malformed text: Illegal character #$& in \"#{copy}\"" )
      end if illegal
      
      copy.gsub!( /\r\n?/, "\n" )
      if copy.include? ?&
        copy.gsub!( SETUTITSBUS[0], SLAICEPS[0] )
        copy.gsub!( SETUTITSBUS[1], SLAICEPS[1] )
        copy.gsub!( SETUTITSBUS[2], SLAICEPS[2] )
        copy.gsub!( SETUTITSBUS[3], SLAICEPS[3] )
        copy.gsub!( SETUTITSBUS[4], SLAICEPS[4] )
        copy.gsub!( /&#0*((?:\d+)|(?:x[a-f0-9]+));/ ) {|m|
          m=$1
          #m='0' if m==''
          m = "0#{m}" if m[0] == ?x
          [Integer(m)].pack('U*')
        }
      end
      copy
    end

EREFERENCE = /&(?!#{Entity::NAME};)/
    # Escapes all possible entities
    def Text::normalize( input, doctype=nil, entity_filter=nil )
      copy = input.to_s
      # Doing it like this rather than in a loop improves the speed
      #copy = copy.gsub( EREFERENCE, '&amp;' )
      copy = copy.gsub( "&", "&amp;" )
      if doctype
        # Replace all ampersands that aren't part of an entity
        doctype.entities.each_value do |entity|
          copy = copy.gsub( entity.value, 
            "&#{entity.name};" ) if entity.value and 
              not( entity_filter and entity_filter.include?(entity) )
        end
      else
        # Replace all ampersands that aren't part of an entity
        DocType::DEFAULT_ENTITIES.each_value do |entity|
          copy = copy.gsub(entity.value, "&#{entity.name};" )
        end
      end
      copy
    end

# Unescapes all possible entities
    def Text::unnormalize( string, doctype=nil, filter=nil, illegal=nil )
      sum = 0
      string.gsub( /\r\n?/, "\n" ).gsub( REFERENCE ) {
        s = Text.expand($&, doctype, filter)
        if sum + s.bytesize > REXML.entity_expansion_text_limit
          raise "entity expansion has grown too large"
        else
          sum += s.bytesize
        end
        s
      }
    end

def Text.expand(ref, doctype, filter)
      if ref[1] == ?#
        if ref[2] == ?x
          [ref[3...-1].to_i(16)].pack('U*')
        else
          [ref[2...-1].to_i].pack('U*')
        end
      elsif ref == '&amp;'
        '&'
      elsif filter and filter.include?( ref[1...-1] )
        ref
      elsif doctype
        doctype.entity( ref[1...-1] ) or ref
      else
        entity_value = DocType::DEFAULT_ENTITIES[ ref[1...-1] ]
        entity_value ? entity_value.value : ref
      end
    end
  end
end

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