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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
@@node = nil
@@pair = []
@@variable = {}
def Functions::node=(value)
@@node = value
end
def Functions::pair=(value)
@@pair = value
end
def Functions::variable=(value)
@@variable = value
end
def Functions::node
@@node
end
def Functions::pair
@@pair
end
def Functions::variable
@@variable
end
def Functions::text( )
return true if @@node.kind_of? Text
end
def Functions::last( )
@@pair[1]
end
def Functions::position( )
@@pair[0]
end
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
# NOT TESTED
def Functions::local_name( node_set=nil )
get_namespace( node_set ){|node|node.local_name}
end
# NOT TESTED
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 ) { |node| node.name }
end
# Helper method.
def Functions::get_namespace( node_set = nil )
if node_set == nil
yield @@node if @@node.kind_of? Namespace
else
return "" unless node_set.kind_of? Enumerable
node = node_set.find{|node| node.kind_of? Namespace}
return "" unless node
yield node
end
end
# UNTESTED
def Functions::string( object=nil )
object = context unless object
if object.kind_of? Array
string( object[0] )
elsif object.kind_of? Text
object.to_s
elsif object.kind_of? Element
object.name
else
object.to_s
end
end
# UNTESTED
def Functions::concat( *objects )
objects.join
end
# UNTESTED
def Functions::starts_with( string, test )
string.index(test) == 0
end
# UNTESTED
def Functions::contains( string, test )
string.include? test
end
# UNTESTED
def Functions::substring_before( string, test )
string[ 0...string.index(test) ]
end
# UNTESTED
def Functions::substring_after( string, test )
string[ string.index(test)+1..-1 ]
end
# UNTESTED
def Functions::substring( string, start, length=0 )
length = string.size if length==0
string[start-1,length]
end
# UNTESTED
def Functions::string_length( string )
string.size
end
# UNTESTED
def Functions::normalize_space( string=nil )
string = string(@@node) if string.nil?
string.strip.gsub(/\s+/um, ' ')
end
# UNTESTED
def Functions::translate( string, tr1, tr2 )
string.tr tr1,tr2
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 or object.kind_of? Parent
object.size > 0
end
end
# UNTESTED
def Functions::not( object )
return object == "true" if object.is_a? String
not object
end
# UNTESTED
def Functions::true( )
true
end
# UNTESTED
def Functions::false( )
false
end
# UNTESTED
def Functions::lang( language )
@@node.collect do |node|
if node.kind_of? Element
lang = false
until node.nil? or lang
lang = compare_language node.attributes["xml:lang"], language
node = node.parent
end
end
end
end
def Functions::compare_language lang1, lang2
lang2.downcase.index(lang1.downcase) == 0
end
def Functions::number( nodes, object=nil )
end
def Functions::sum( nodes )
end
def Functions::floor( nodes, number )
number = number.to_f if number.kind_of? String
number.floor
end
def Functions::ceiling( nodes, number )
number = number.to_f if number.kind_of? String
number.ceil
end
def Functions::round( nodes, number )
number = number.to_f if number.kind_of? String
number.round
end
def Functions::method_missing( id )
XPath.match( @@node, id.id2name )
end
end
end
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