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require 'rexml/security'
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
NEEDS_A_SECOND_CHECK = /(<|&((#{Entity::NAME});|(#0*((?:\d+)|(?:x[a-fA-F0-9]+)));)?)/um
NUMERICENTITY = /�*((?:\d+)|(?:x[a-fA-F0-9]+));/
VALID_CHAR = [
0x9, 0xA, 0xD,
(0x20..0xD7FF),
(0xE000..0xFFFD),
(0x10000..0x10FFFF)
]
if String.method_defined? :encode
VALID_XML_CHARS = Regexp.new('^['+
VALID_CHAR.map { |item|
case item
when Fixnum
[item].pack('U').force_encoding('utf-8')
when Range
[item.first, '-'.ord, item.last].pack('UUU').force_encoding('utf-8')
end
}.join +
']*$')
else
VALID_XML_CHARS = /^(
[\x09\x0A\x0D\x20-\x7E] # ASCII
| [\xC2-\xDF][\x80-\xBF] # non-overlong 2-byte
| \xE0[\xA0-\xBF][\x80-\xBF] # excluding overlongs
| [\xE1-\xEC\xEE][\x80-\xBF]{2} # straight 3-byte
| \xEF[\x80-\xBE]{2} #
| \xEF\xBF[\x80-\xBD] # excluding U+fffe and U+ffff
| \xED[\x80-\x9F][\x80-\xBF] # excluding surrogates
| \xF0[\x90-\xBF][\x80-\xBF]{2} # planes 1-3
| [\xF1-\xF3][\x80-\xBF]{3} # planes 4-15
| \xF4[\x80-\x8F][\x80-\xBF]{2} # plane 16
)*$/nx;
end
# 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.
#
# +illegal+ INTERNAL USE ONLY
def initialize(arg, respect_whitespace=false, parent=nil, raw=nil,
entity_filter=nil, illegal=NEEDS_A_SECOND_CHECK )
@raw = false
@parent = nil
if parent
super( parent )
@raw = parent.raw
end
@raw = raw unless raw.nil?
@entity_filter = entity_filter
clear_cache
if arg.kind_of? String
@string = arg.dup
@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" )
Text.check(@string, illegal, doctype) if @raw
end
def parent= parent
super(parent)
Text.check(@string, NEEDS_A_SECOND_CHECK, doctype) if @raw and @parent
end
# check for illegal characters
def Text.check string, pattern, doctype
# illegal anywhere
if string !~ VALID_XML_CHARS
if String.method_defined? :encode
string.chars.each do |c|
case c.ord
when *VALID_CHAR
else
raise "Illegal character #{c.inspect} in raw string \"#{string}\""
end
end
else
string.scan(/[\x00-\x7F]|[\x80-\xBF][\xC0-\xF0]*|[\xC0-\xF0]/n) do |c|
case c.unpack('U')
when *VALID_CHAR
else
raise "Illegal character #{c.inspect} in raw string \"#{string}\""
end
end
end
end
# context sensitive
string.scan(pattern) do
if $1[-1] != ?;
raise "Illegal character '#{$1}' in raw string \"#{string}\""
elsif $1[0] == ?&
if $5 and $5[0] == ?#
case ($5[1] == ?x ? $5[2..-1].to_i(16) : $5[1..-1].to_i)
when *VALID_CHAR
else
raise "Illegal character '#{$1}' in raw string \"#{string}\""
end
# FIXME: below can't work but this needs API change.
# elsif @parent and $3 and !SUBSTITUTES.include?($1)
# if !doctype or !doctype.entities.has_key?($3)
# raise "Undeclared entity '#{$1}' in raw string \"#{string}\""
# end
end
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.
#
# +returns+ the text itself to enable method chain like
# 'text << "XXX" << "YYY"'.
def <<( to_append )
@string << to_append.gsub( /\r\n?/, "\n" )
clear_cache
self
end
# +other+ a String or a Text
# +returns+ the result of (to_s <=> arg.to_s)
def <=>( other )
to_s() <=> other.to_s
end
def doctype
if @parent
doc = @parent.document
doc.doctype if doc
end
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
@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
@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" )
clear_cache
@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 { |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
private
def clear_cache
@normalized = nil
@unnormalized = nil
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!( /�*((?:\d+)|(?:x[a-f0-9]+));/ ) {
m=$1
#m='0' if m==''
m = "0#{m}" if m[0] == ?x
[Integer(m)].pack('U*')
}
end
copy
end
EREFERENCE = /&(?!#{Entity::NAME};)/
# Escapes all possible entities
def Text::normalize( input, doctype=nil, entity_filter=nil )
copy = input.to_s
# Doing it like this rather than in a loop improves the speed
#copy = copy.gsub( EREFERENCE, '&' )
copy = copy.gsub( "&", "&" )
if doctype
# Replace all ampersands that aren't part of an entity
doctype.entities.each_value do |entity|
copy = copy.gsub( entity.value,
"&#{entity.name};" ) if entity.value and
not( entity_filter and entity_filter.include?(entity.name) )
end
else
# Replace all ampersands that aren't part of an entity
DocType::DEFAULT_ENTITIES.each_value do |entity|
copy = copy.gsub(entity.value, "&#{entity.name};" )
end
end
copy
end
# Unescapes all possible entities
def Text::unnormalize( string, doctype=nil, filter=nil, illegal=nil )
sum = 0
string.gsub( /\r\n?/, "\n" ).gsub( REFERENCE ) {
s = Text.expand($&, doctype, filter)
if sum + s.bytesize > Security.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