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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
return @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 )
rv = string.clone
rv.gsub!( /\r\n?/, "\n" )
matches = rv.scan( REFERENCE )
return rv if matches.size == 0
rv.gsub!( NUMERICENTITY ) {|m|
m=$1
m = "0#{m}" if m[0] == ?x
[Integer(m)].pack('U*')
}
matches.collect!{|x|x[0]}.compact!
if matches.size > 0
if doctype
matches.each do |entity_reference|
unless filter and filter.include?(entity_reference)
entity_value = doctype.entity( entity_reference )
re = /&#{entity_reference};/
rv.gsub!( re, entity_value ) if entity_value
end
end
else
matches.each do |entity_reference|
unless filter and filter.include?(entity_reference)
entity_value = DocType::DEFAULT_ENTITIES[ entity_reference ]
re = /&#{entity_reference};/
rv.gsub!( re, entity_value.value ) if entity_value
end
end
end
rv.gsub!( /&amp;/, '&' )
end
rv
end
end
end
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