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require 'htree/scan' # for Pat::Nmtoken
require 'htree/context'
module HTree
# Name represents a element name and attribute name.
# It consists of a namespace prefix, a namespace URI and a local name.
class Name
=begin
element name prefix uri localname
{u}n, n with xmlns=u nil 'u' 'n'
p{u}n, p:n with xmlns:p=u 'p' 'u' 'n'
n with xmlns='' nil '' 'n'
attribute name
xmlns= 'xmlns' nil nil
xmlns:n= 'xmlns' nil 'n'
p{u}n=, p:n= with xmlns:p=u 'p' 'u' 'n'
n= nil '' 'n'
=end
def Name.parse_element_name(name, context)
if /\{(.*)\}/ =~ name
# "{u}n" means "use default namespace",
# "p{u}n" means "use the specified prefix p"
$` == '' ? Name.new(nil, $1, $') : Name.new($`, $1, $')
elsif /:/ =~ name && !context.namespace_uri($`).empty?
Name.new($`, context.namespace_uri($`), $')
elsif !context.namespace_uri(nil).empty?
Name.new(nil, context.namespace_uri(nil), name)
else
Name.new(nil, '', name)
end
end
def Name.parse_attribute_name(name, context)
if name == 'xmlns'
Name.new('xmlns', nil, nil)
elsif /\Axmlns:/ =~ name
Name.new('xmlns', nil, $')
elsif /\{(.*)\}/ =~ name
case $`
when ''; Name.new(nil, $1, $')
else Name.new($`, $1, $')
end
elsif /:/ =~ name && !context.namespace_uri($`).empty?
Name.new($`, context.namespace_uri($`), $')
else
Name.new(nil, '', name)
end
end
NameCache = {}
def Name.new(namespace_prefix, namespace_uri, local_name)
key = [namespace_prefix, namespace_uri, local_name, self]
NameCache.fetch(key) {
0.upto(2) {|i| key[i] = key[i].dup.freeze if key[i] }
NameCache[key] = super(key[0], key[1], key[2])
}
end
def initialize(namespace_prefix, namespace_uri, local_name)
@namespace_prefix = namespace_prefix
@namespace_uri = namespace_uri
@local_name = local_name
if @namespace_prefix && /\A#{Pat::Nmtoken}\z/o !~ @namespace_prefix
raise HTree::Error, "invalid namespace prefix: #{@namespace_prefix.inspect}"
end
if @local_name && /\A#{Pat::Nmtoken}\z/o !~ @local_name
raise HTree::Error, "invalid local name: #{@local_name.inspect}"
end
if @namespace_prefix == 'xmlns'
unless @namespace_uri == nil
raise HTree::Error, "Name object for xmlns:* must not have namespace URI: #{@namespace_uri.inspect}"
end
else
unless String === @namespace_uri
raise HTree::Error, "invalid namespace URI: #{@namespace_uri.inspect}"
end
end
end
attr_reader :namespace_prefix, :namespace_uri, :local_name
def xmlns?
@namespace_prefix == 'xmlns' && @namespace_uri == nil
end
def universal_name
if @namespace_uri && !@namespace_uri.empty?
"{#{@namespace_uri}}#{@local_name}"
else
@local_name.dup
end
end
def qualified_name
if @namespace_uri && !@namespace_uri.empty?
if @namespace_prefix
"#{@namespace_prefix}:#{@local_name}"
else
@local_name.dup
end
elsif @local_name
@local_name.dup
else
"xmlns"
end
end
def to_s
if @namespace_uri && !@namespace_uri.empty?
if @namespace_prefix
"#{@namespace_prefix}{#{@namespace_uri}}#{@local_name}"
else
"{#{@namespace_uri}}#{@local_name}"
end
elsif @local_name
@local_name.dup
else
"xmlns"
end
end
end
end
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