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require "rexml/namespace"
require 'rexml/text'
module REXML
# Defines an Element Attribute; IE, a attribute=value pair, as in:
# <element attribute="value"/>. Attributes can be in their own
# namespaces. General users of REXML will not interact with the
# Attribute class much.
class Attribute
include Node
include Namespace
# The element to which this attribute belongs
attr_reader :element
# The normalized value of this attribute. That is, the attribute with
# entities intact.
attr_writer :normalized
PATTERN = /\s*(#{NAME_STR})\s*=\s*(["'])(.*?)\2/um
# Constructor.
#
# Attribute.new( attribute_to_clone )
# Attribute.new( source )
# Attribute.new( "attr", "attr_value" )
# Attribute.new( "attr", "attr_value", parent_element )
def initialize( first, second=nil, parent=nil )
@normalized = @unnormalized = @element = nil
if first.kind_of? Attribute
self.name = first.expanded_name
@value = first.value
if second.kind_of? Element
@element = second
else
@element = first.element
end
elsif first.kind_of? String
@element = parent if parent.kind_of? Element
self.name = first
@value = second.to_s
else
raise "illegal argument #{first.class.name} to Attribute constructor"
end
end
# Returns the namespace of the attribute.
#
# e = Element.new( "elns:myelement" )
# e.add_attribute( "nsa:a", "aval" )
# e.add_attribute( "b", "bval" )
# e.attributes.get_attribute( "a" ).prefix # -> "nsa"
# e.attributes.get_attribute( "b" ).prefix # -> "elns"
# a = Attribute.new( "x", "y" )
# a.prefix # -> ""
def prefix
pf = super
if pf == ""
pf = @element.prefix if @element
end
pf
end
# Returns the namespace URL, if defined, or nil otherwise
#
# e = Element.new("el")
# e.add_attributes({"xmlns:ns", "http://url"})
# e.namespace( "ns" ) # -> "http://url"
def namespace arg=nil
arg = prefix if arg.nil?
@element.namespace arg
end
# Returns true if other is an Attribute and has the same name and value,
# false otherwise.
def ==( other )
other.kind_of?(Attribute) and other.name==name and other.value==@value
end
# Creates (and returns) a hash from both the name and value
def hash
name.hash + value.hash
end
# Returns this attribute out as XML source, expanding the name
#
# a = Attribute.new( "x", "y" )
# a.to_string # -> "x='y'"
# b = Attribute.new( "ns:x", "y" )
# b.to_string # -> "ns:x='y'"
def to_string
"#@expanded_name='#{to_s().gsub(/'/, ''')}'"
end
# Returns the attribute value, with entities replaced
def to_s
return @normalized if @normalized
doctype = nil
if @element
doc = @element.document
doctype = doc.doctype if doc
end
@unnormalized = nil
@value = @normalized = Text::normalize( @value, doctype )
end
# Returns the UNNORMALIZED value of this attribute. That is, entities
# have been expanded to their values
def value
@unnormalized if @unnormalized
doctype = nil
if @element
doc = @element.document
doctype = doc.doctype if doc
end
@normalized = nil
@value = @unnormalized = Text::unnormalize( @value, doctype )
end
# Returns a copy of this attribute
def clone
Attribute.new self
end
# Sets the element of which this object is an attribute. Normally, this
# is not directly called.
#
# Returns this attribute
def element=( element )
@element = element
self
end
# Removes this Attribute from the tree, and returns true if successfull
#
# This method is usually not called directly.
def remove
@element.attributes.delete self.name unless @element.nil?
end
# Writes this attribute (EG, puts 'key="value"' to the output)
def write( output, indent=-1 )
output << to_string
end
def node_type
:attribute
end
def inspect
rv = ""
write( rv )
rv
end
def xpath
path = @element.xpath
path += "/@#{self.expanded_name}"
return path
end
end
end
#vim:ts=2 sw=2 noexpandtab:
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