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require 'rexml/xmltokens'
# [ :element, parent, name, attributes, children* ]
# a = Node.new
# a << "B" # => <a>B</a>
# a.b # => <a>B<b/></a>
# a.b[1] # => <a>B<b/><b/><a>
# a.b[1]["x"] = "y" # => <a>B<b/><b x="y"/></a>
# a.b[0].c # => <a>B<b><c/></b><b x="y"/></a>
# a.b.c << "D" # => <a>B<b><c>D</c></b><b x="y"/></a>
module REXML
module Light
# Represents a tagged XML element. Elements are characterized by
# having children, attributes, and names, and can themselves be
# children.
class Node
NAMESPLIT = /^(?:(#{XMLTokens::NCNAME_STR}):)?(#{XMLTokens::NCNAME_STR})/u
PARENTS = [ :element, :document, :doctype ]
# Create a new element.
def initialize node=nil
@node = node
if node.kind_of? String
node = [ :text, node ]
elsif node.nil?
node = [ :document, nil, nil ]
elsif node[0] == :start_element
node[0] = :element
elsif node[0] == :start_doctype
node[0] = :doctype
elsif node[0] == :start_document
node[0] = :document
end
end
def size
if PARENTS.include? @node[0]
@node[-1].size
else
0
end
end
def each
size.times { |x| yield( at(x+4) ) }
end
def name
at(2)
end
def name=( name_str, ns=nil )
pfx = ''
pfx = "#{prefix(ns)}:" if ns
_old_put(2, "#{pfx}#{name_str}")
end
def parent=( node )
_old_put(1,node)
end
def local_name
namesplit
@name
end
def local_name=( name_str )
_old_put( 1, "#@prefix:#{name_str}" )
end
def prefix( namespace=nil )
prefix_of( self, namespace )
end
def namespace( prefix=prefix() )
namespace_of( self, prefix )
end
def namespace=( namespace )
@prefix = prefix( namespace )
pfx = ''
pfx = "#@prefix:" if @prefix.size > 0
_old_put(1, "#{pfx}#@name")
end
def []( reference, ns=nil )
if reference.kind_of? String
pfx = ''
pfx = "#{prefix(ns)}:" if ns
at(3)["#{pfx}#{reference}"]
elsif reference.kind_of? Range
_old_get( Range.new(4+reference.begin, reference.end, reference.exclude_end?) )
else
_old_get( 4+reference )
end
end
def =~( path )
XPath.match( self, path )
end
# Doesn't handle namespaces yet
def []=( reference, ns, value=nil )
if reference.kind_of? String
value = ns unless value
at( 3 )[reference] = value
elsif reference.kind_of? Range
_old_put( Range.new(3+reference.begin, reference.end, reference.exclude_end?), ns )
else
if value
_old_put( 4+reference, ns, value )
else
_old_put( 4+reference, ns )
end
end
end
# Append a child to this element, optionally under a provided namespace.
# The namespace argument is ignored if the element argument is an Element
# object. Otherwise, the element argument is a string, the namespace (if
# provided) is the namespace the element is created in.
def << element
if node_type() == :text
at(-1) << element
else
newnode = Node.new( element )
newnode.parent = self
self.push( newnode )
end
at(-1)
end
def node_type
_old_get(0)
end
def text=( foo )
replace = at(4).kind_of?(String)? 1 : 0
self._old_put(4,replace, normalizefoo)
end
def root
context = self
context = context.at(1) while context.at(1)
end
def has_name?( name, namespace = '' )
at(3) == name and namespace() == namespace
end
def children
self
end
def parent
at(1)
end
def to_s
end
private
def namesplit
return if @name.defined?
at(2) =~ NAMESPLIT
@prefix = '' || $1
@name = $2
end
def namespace_of( node, prefix=nil )
if not prefix
name = at(2)
name =~ NAMESPLIT
prefix = $1
end
to_find = 'xmlns'
to_find = "xmlns:#{prefix}" if not prefix.nil?
ns = at(3)[ to_find ]
ns ? ns : namespace_of( @node[0], prefix )
end
def prefix_of( node, namespace=nil )
if not namespace
name = node.name
name =~ NAMESPLIT
$1
else
ns = at(3).find { |k,v| v == namespace }
ns ? ns : prefix_of( node.parent, namespace )
end
end
end
end
end
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