module REXML::Functions
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()”
Constants
- INTERNAL_METHODS
- namespace_context
- variables
Public Class Methods
UNTESTED
# File lib/rexml/functions.rb, line 295 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
# File lib/rexml/functions.rb, line 391 def Functions::ceiling( number ) number(number).ceil end
# File lib/rexml/functions.rb, line 342 def Functions::compare_language lang1, lang2 lang2.downcase.index(lang1.downcase) == 0 end
UNTESTED
# File lib/rexml/functions.rb, line 170 def Functions::concat( *objects ) objects.join end
Fixed by Mike Stok
# File lib/rexml/functions.rb, line 180 def Functions::contains( string, test ) string(string).include?(string(test)) end
# File lib/rexml/functions.rb, line 37 def Functions::context=(value); @@context = value; end
Returns the size of the given list of nodes.
# File lib/rexml/functions.rb, line 59 def Functions::count( node_set ) node_set.size end
UNTESTED
# File lib/rexml/functions.rb, line 319 def Functions::false( ) false end
# File lib/rexml/functions.rb, line 387 def Functions::floor( number ) number(number).floor end
Helper method.
# File lib/rexml/functions.rb, line 86 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
UNTESTED
# File lib/rexml/functions.rb, line 324 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
Returns the last node of the given list of nodes.
# File lib/rexml/functions.rb, line 50 def Functions::last( ) @@context[:size] end
UNTESTED
# File lib/rexml/functions.rb, line 69 def Functions::local_name( node_set=nil ) get_namespace( node_set ) do |node| return node.local_name end end
# File lib/rexml/functions.rb, line 79 def Functions::name( node_set=nil ) get_namespace( node_set ) do |node| node.expanded_name end end
# File lib/rexml/functions.rb, line 34 def Functions::namespace_context ; @@namespace_context ; end
# File lib/rexml/functions.rb, line 32 def Functions::namespace_context=(x) ; @@namespace_context=x ; end
# File lib/rexml/functions.rb, line 75 def Functions::namespace_uri( node_set=nil ) get_namespace( node_set ) {|node| node.namespace} end
UNTESTED
# File lib/rexml/functions.rb, line 242 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 lib/rexml/functions.rb, line 309 def Functions::not( object ) not boolean( object ) 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 lib/rexml/functions.rb, line 359 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
# File lib/rexml/functions.rb, line 54 def Functions::position( ) @@context[:index] end
# File lib/rexml/functions.rb, line 406 def Functions::processing_instruction( node ) node.node_type == :processing_instruction end
# File lib/rexml/functions.rb, line 395 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 lib/rexml/functions.rb, line 410 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 lib/rexml/functions.rb, line 25 def singleton_method_added(name) unless INTERNAL_METHODS.include?(name) @@available_functions[name] = true end end
Fixed by Mike Stok
# File lib/rexml/functions.rb, line 175 def Functions::starts_with( string, test ) string(string).index(string(test)) == 0 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 lib/rexml/functions.rb, line 133 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
UNTESTED
# File lib/rexml/functions.rb, line 237 def Functions::string_length( string ) string(string).length 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 lib/rexml/functions.rb, line 157 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
Take equal portions of Mike Stok and Sean Russell; mix vigorously, and pour into a tall, chilled glass. Serves 10,000.
# File lib/rexml/functions.rb, line 204 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
Kouhei fixed this too
# File lib/rexml/functions.rb, line 196 def Functions::substring_after( string, test ) ruby_string = string(string) return $1 if ruby_string =~ /#{test}(.*)/ "" end
Kouhei fixed this
# File lib/rexml/functions.rb, line 185 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
# File lib/rexml/functions.rb, line 382 def Functions::sum( nodes ) nodes = [nodes] unless nodes.kind_of? Array nodes.inject(0) { |r,n| r + number(string(n)) } end
# File lib/rexml/functions.rb, line 39 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
This is entirely Mike Stok's beast
# File lib/rexml/functions.rb, line 252 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
UNTESTED
# File lib/rexml/functions.rb, line 314 def Functions::true( ) true end
# File lib/rexml/functions.rb, line 35 def Functions::variables ; @@variables ; end
# File lib/rexml/functions.rb, line 33 def Functions::variables=(x) ; @@variables=x ; end