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## -*- Ruby -*-
## XML::DOM::Visitor
## 1998 by yoshidam
##
## Oct 23, 1998 yoshidam Fix each
##
=begin
= XML::DOM::Visitor
== Module XML
=end
module XML
=begin
== Module XML::DOM (XML::SimpleTree)
=end
module DOM
=begin
== Class XML::DOM::Visitor
Skelton class of Visitor.
You can override the following methods and implement the other
"visit_TYPE" methods.
You should implement some "visit_name_NAME" methods and
"method_missing" method for accept_name.
=end
## Skeleton visitor
class Visitor
## You can override the following methods and implement the other
## "visit_TYPE" methods.
## You should implement some "visit_name_NAME" methods and
## "method_missing" method for accept_name.
=begin
=== Methods
--- Visitor#visit_Document(grove, *rest)
callback method.
=end
def visit_Document(grove, *rest)
grove.children_accept(self, *rest)
end
=begin
--- Visitor#visit_Element(element, *rest)
callback method.
=end
def visit_Element(element, *rest)
element.children_accept(self, *rest)
end
=begin
--- Visitor#visit_Text(text, *rest)
callback method.
=end
def visit_Text(text, *rest)
end
=begin
--- Visitor#visit_CDATASection(text, *rest)
callback method.
=end
def visit_CDATASection(text, *rest)
end
=begin
--- Visitor#visit_Comment(comment, *rest)
callback method.
=end
def visit_Comment(comment, *rest)
end
=begin
--- Visitor#visit_ProcessingInstruction(pi, *rest)
callback method.
=end
def visit_ProcessingInstruction(pi, *rest)
end
end
=begin
== Class XML::DOM::Node
XML::Grove::Visitor like interfaces.
=end
class Node
=begin
--- Node#accept(visitor, *rest)
call back visit_* method.
=end
## XML::Grove::Visitor like interfaces
def accept(visitor, *rest)
typename = self.class.to_s.sub(/.*?([^:]+)$/, '\1')
visitor.send("visit_" + typename, self, *rest)
end
=begin
--- Node#accept_name(visitor, *rest)
call back visit_name_* method.
=end
def accept_name(visitor, *rest)
if nodeType == ELEMENT_NODE
name_method = "visit_name_" + nodeName
visitor.send(name_method, self, *rest)
else
self.accept(visitor, *rest)
end
end
=begin
--- Node#children_accept(visitor, *rest)
for each children, call back visit_* methods.
=end
def children_accept(visitor, *rest)
ret = []
@children && @children.each { |node|
ret.push(node.accept(visitor, *rest))
}
ret
end
=begin
--- Node#children_accept_name(visitor, *rest)
for each children, call back visit_name_* method.
=end
def children_accept_name(visitor, *rest)
ret = []
@children && @children.each { |node|
ret.push(node.accept_name(visitor, *rest))
}
ret
end
=begin
--- Node#each
iterator interface.
=end
## Iterator interface
include Enumerable
def each
sibstack = []
siblings = [ self ]
while true
if siblings.length == 0
break if sibstack.length == 0
siblings = sibstack.pop
next
end
node = siblings.shift
yield(node)
children = node.childNodes
if !children.nil?
sibstack.push(siblings)
siblings = children.to_a.dup
end
end
end
end
end
end
|
