If you add a method, keep in mind two things: (1) the first argument will always be a list of nodes from which to filter. In the case of context methods (such as position), the function should return an array with a value for each child in the array. (2) all method calls from XML will have “-” replaced with “_”. Therefore, in XML, “local-name()” is identical (and actually becomes) “local_name()”
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 296
def Functions::boolean( object=nil )
if object.kind_of? String
if object =~ /\d+/u
return object.to_f != 0
else
return object.size > 0
end
elsif object.kind_of? Array
object = object.find{|x| x and true}
end
return object ? true : false
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 392
def Functions::ceiling( number )
number(number).ceil
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 343
def Functions::compare_language lang1, lang2
lang2.downcase.index(lang1.downcase) == 0
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 171
def Functions::concat( *objects )
objects.join
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 181
def Functions::contains( string, test )
string(string).include?(string(test))
end
Fixed by Mike Stok
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 38
def Functions::context=(value); @@context = value; end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 60
def Functions::count( node_set )
node_set.size
end
Returns the size of the given list of nodes.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 320
def Functions::false( )
false
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 388
def Functions::floor( number )
number(number).floor
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 87
def Functions::get_namespace( node_set = nil )
if node_set == nil
yield @@context[:node] if defined? @@context[:node].namespace
else
if node_set.respond_to? :each
node_set.each { |node| yield node if defined? node.namespace }
elsif node_set.respond_to? :namespace
yield node_set
end
end
end
Helper method.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 66
def Functions::id( object )
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 325
def Functions::lang( language )
lang = false
node = @@context[:node]
attr = nil
until node.nil?
if node.node_type == :element
attr = node.attributes["xml:lang"]
unless attr.nil?
lang = compare_language(string(language), attr)
break
else
end
end
node = node.parent
end
lang
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 51
def Functions::last( )
@@context[:size]
end
Returns the last node of the given list of nodes.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 70
def Functions::local_name( node_set=nil )
get_namespace( node_set ) do |node|
return node.local_name
end
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 80
def Functions::name( node_set=nil )
get_namespace( node_set ) do |node|
node.expanded_name
end
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 35
def Functions::namespace_context ; @@namespace_context ; end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 33
def Functions::namespace_context=(x) ; @@namespace_context=x ; end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 76
def Functions::namespace_uri( node_set=nil )
get_namespace( node_set ) {|node| node.namespace}
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 243
def Functions::normalize_space( string=nil )
string = string(@@context[:node]) if string.nil?
if string.kind_of? Array
string.collect{|x| string.to_s.strip.gsub(/\s+/um, ' ') if string}
else
string.to_s.strip.gsub(/\s+/um, ' ')
end
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 310
def Functions::not( object )
not boolean( object )
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 360
def Functions::number( object=nil )
object = @@context[:node] unless object
case object
when true
Float(1)
when false
Float(0)
when Array
number(string( object ))
when Numeric
object.to_f
else
str = string( object )
# If XPath ever gets scientific notation...
#if str =~ /^\s*-?(\d*\.?\d+|\d+\.)([Ee]\d*)?\s*$/
if str =~ /^\s*-?(\d*\.?\d+|\d+\.)\s*$/
str.to_f
else
(0.0 / 0.0)
end
end
end
a string that consists of optional whitespace followed by an optional minus sign followed by a Number followed by whitespace is converted to the IEEE 754 number that is nearest (according to the IEEE 754 round-to-nearest rule) to the mathematical value represented by the string; any other string is converted to NaN
boolean true is converted to 1; boolean false is converted to 0
a node-set is first converted to a string as if by a call to the string function and then converted in the same way as a string argument
an object of a type other than the four basic types is converted to a number in a way that is dependent on that type
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 55
def Functions::position( )
@@context[:index]
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 407
def Functions::processing_instruction( node )
node.node_type == :processing_instruction
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 396
def Functions::round( number )
number = number(number)
begin
neg = number.negative?
number = number.abs.round(half: :up)
neg ? -number : number
rescue FloatDomainError
number
end
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 411
def Functions::send(name, *args)
if @@available_functions[name.to_sym]
super
else
# TODO: Maybe, this is not XPath spec behavior.
# This behavior must be reconsidered.
XPath.match(@@context[:node], name.to_s)
end
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 26
def singleton_method_added(name)
unless INTERNAL_METHODS.include?(name)
@@available_functions[name] = true
end
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 176
def Functions::starts_with( string, test )
string(string).index(string(test)) == 0
end
Fixed by Mike Stok
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 134
def Functions::string( object=nil )
#object = @context unless object
if object.instance_of? Array
string( object[0] )
elsif defined? object.node_type
if object.node_type == :attribute
object.value
elsif object.node_type == :element || object.node_type == :document
string_value(object)
else
object.to_s
end
elsif object.nil?
return ""
else
object.to_s
end
end
A node-set is converted to a string by returning the string-value of the node in the node-set that is first in document order. If the node-set is empty, an empty string is returned.
A number is converted to a string as follows
NaN is converted to the string NaN
positive zero is converted to the string 0
negative zero is converted to the string 0
positive infinity is converted to the string Infinity
negative infinity is converted to the string -Infinity
if the number is an integer, the number is represented in decimal form as a Number with no decimal point and no leading zeros, preceded by a minus sign (-) if the number is negative
otherwise, the number is represented in decimal form as a Number including a decimal point with at least one digit before the decimal point and at least one digit after the decimal point, preceded by a minus sign (-) if the number is negative; there must be no leading zeros before the decimal point apart possibly from the one required digit immediately before the decimal point; beyond the one required digit after the decimal point there must be as many, but only as many, more digits as are needed to uniquely distinguish the number from all other IEEE 754 numeric values.
The boolean false value is converted to the string false. The boolean true value is converted to the string true.
An object of a type other than the four basic types is converted to a string in a way that is dependent on that type.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 238
def Functions::string_length( string )
string(string).length
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 158
def Functions::string_value( o )
rv = ""
o.children.each { |e|
if e.node_type == :text
rv << e.to_s
elsif e.node_type == :element
rv << string_value( e )
end
}
rv
end
A node-set is converted to a string by returning the concatenation of the string-value of each of the children of the node in the node-set that is first in document order. If the node-set is empty, an empty string is returned.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 205
def Functions::substring( string, start, length=nil )
ruby_string = string(string)
ruby_length = if length.nil?
ruby_string.length.to_f
else
number(length)
end
ruby_start = number(start)
# Handle the special cases
return '' if (
ruby_length.nan? or
ruby_start.nan? or
ruby_start.infinite?
)
infinite_length = ruby_length.infinite? == 1
ruby_length = ruby_string.length if infinite_length
# Now, get the bounds. The XPath bounds are 1..length; the ruby bounds
# are 0..length. Therefore, we have to offset the bounds by one.
ruby_start = round(ruby_start) - 1
ruby_length = round(ruby_length)
if ruby_start < 0
ruby_length += ruby_start unless infinite_length
ruby_start = 0
end
return '' if ruby_length <= 0
ruby_string[ruby_start,ruby_length]
end
Take equal portions of Mike Stok and Sean Russell; mix vigorously, and pour into a tall, chilled glass. Serves 10,000.
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 197
def Functions::substring_after( string, test )
ruby_string = string(string)
return $1 if ruby_string =~ /#{test}(.*)/
""
end
Kouhei fixed this too
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 186
def Functions::substring_before( string, test )
ruby_string = string(string)
ruby_index = ruby_string.index(string(test))
if ruby_index.nil?
""
else
ruby_string[ 0...ruby_index ]
end
end
Kouhei fixed this
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 383
def Functions::sum( nodes )
nodes = [nodes] unless nodes.kind_of? Array
nodes.inject(0) { |r,n| r + number(string(n)) }
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 40
def Functions::text( )
if @@context[:node].node_type == :element
return @@context[:node].find_all{|n| n.node_type == :text}.collect{|n| n.value}
elsif @@context[:node].node_type == :text
return @@context[:node].value
else
return false
end
end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 253
def Functions::translate( string, tr1, tr2 )
from = string(tr1)
to = string(tr2)
# the map is our translation table.
#
# if a character occurs more than once in the
# from string then we ignore the second &
# subsequent mappings
#
# if a character maps to nil then we delete it
# in the output. This happens if the from
# string is longer than the to string
#
# there's nothing about - or ^ being special in
# http://www.w3.org/TR/xpath#function-translate
# so we don't build ranges or negated classes
map = Hash.new
0.upto(from.length - 1) { |pos|
from_char = from[pos]
unless map.has_key? from_char
map[from_char] =
if pos < to.length
to[pos]
else
nil
end
end
}
if ''.respond_to? :chars
string(string).chars.collect { |c|
if map.has_key? c then map[c] else c end
}.compact.join
else
string(string).unpack('U*').collect { |c|
if map.has_key? c then map[c] else c end
}.compact.pack('U*')
end
end
This is entirely Mike Stok’s beast
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 315
def Functions::true( )
true
end
UNTESTED
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 36
def Functions::variables ; @@variables ; end
# File tmp/rubies/ruby-2.5.9/lib/rexml/functions.rb, line 34
def Functions::variables=(x) ; @@variables=x ; end