JezK
Edit File: functions.rb
# frozen_string_literal: false module REXML # 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()" module Functions @@available_functions = {} @@context = nil @@namespace_context = {} @@variables = {} INTERNAL_METHODS = [ :namespace_context, :namespace_context=, :variables, :variables=, :context=, :get_namespace, :send, ] class << self def singleton_method_added(name) unless INTERNAL_METHODS.include?(name) @@available_functions[name] = true end end end def Functions::namespace_context=(x) ; @@namespace_context=x ; end def Functions::variables=(x) ; @@variables=x ; end def Functions::namespace_context ; @@namespace_context ; end def Functions::variables ; @@variables ; end def Functions::context=(value); @@context = value; end 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 # Returns the last node of the given list of nodes. def Functions::last( ) @@context[:size] end def Functions::position( ) @@context[:index] end # Returns the size of the given list of nodes. def Functions::count( node_set ) node_set.size end # Since REXML is non-validating, this method is not implemented as it # requires a DTD def Functions::id( object ) end # UNTESTED def Functions::local_name( node_set=nil ) get_namespace( node_set ) do |node| return node.local_name end end def Functions::namespace_uri( node_set=nil ) get_namespace( node_set ) {|node| node.namespace} end def Functions::name( node_set=nil ) get_namespace( node_set ) do |node| node.expanded_name end end # Helper method. 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 # 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. 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 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. 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 # UNTESTED def Functions::concat( *objects ) objects.join end # Fixed by Mike Stok def Functions::starts_with( string, test ) string(string).index(string(test)) == 0 end # Fixed by Mike Stok def Functions::contains( string, test ) string(string).include?(string(test)) end # Kouhei fixed this 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 too def Functions::substring_after( string, test ) ruby_string = string(string) return $1 if ruby_string =~ /#{test}(.*)/ "" end # Take equal portions of Mike Stok and Sean Russell; mix # vigorously, and pour into a tall, chilled glass. Serves 10,000. 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 # UNTESTED def Functions::string_length( string ) string(string).length end # UNTESTED 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 # This is entirely Mike Stok's beast 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 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 def Functions::not( object ) not boolean( object ) end # UNTESTED def Functions::true( ) true end # UNTESTED def Functions::false( ) false end # UNTESTED 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 def Functions::compare_language lang1, lang2 lang2.downcase.index(lang1.downcase) == 0 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 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 def Functions::sum( nodes ) nodes = [nodes] unless nodes.kind_of? Array nodes.inject(0) { |r,n| r + number(string(n)) } end def Functions::floor( number ) number(number).floor end def Functions::ceiling( number ) number(number).ceil end 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 def Functions::processing_instruction( node ) node.node_type == :processing_instruction end 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 end end