Support for the XPath descendant axis.

This commit is contained in:
Yorick Peterse 2014-07-24 09:49:05 +02:00
parent 2ed7c457a5
commit dd37b028a0
2 changed files with 77 additions and 1 deletions

View File

@ -217,6 +217,25 @@ module Oga
return on_test(node, context)
end
##
# Evaluator the `descendant` axis. This method processes child nodes until
# the very end of the tree, no "short-circuiting" mechanism is used.
#
# @param [Oga::XPath::Node] node
# @param [Oga::XML::NodeSet] context
# @return [Oga::XML::NodeSet]
#
def on_axis_descendant(node, context)
nodes = on_test(node, context)
children = child_nodes(context)
unless children.empty?
nodes += on_axis_descendant(node, children)
end
return nodes
end
##
# Returns a node set containing all the child nodes of the given set of
# nodes.

View File

@ -2,7 +2,7 @@ require 'spec_helper'
describe Oga::XPath::Evaluator do
before do
@document = parse('<a><b><c></c></b><d></d></a>')
@document = parse('<a><b><c></c></b><d></d><a></a></a>')
@c_node = @document.children[0].children[0].children[0]
end
@ -170,4 +170,61 @@ describe Oga::XPath::Evaluator do
it_behaves_like :empty_node_set
end
end
context 'descendant axis' do
before do
@evaluator = described_class.new(@document)
@first_a = @document.children[0]
@second_a = @first_a.children[-1]
end
context 'direct descendants' do
before do
@set = @evaluator.evaluate('descendant::a')
end
it_behaves_like :node_set, :length => 2
example 'return the first <a> node' do
@set[0].should == @first_a
end
example 'return the second <a> node' do
@set[1].should == @second_a
end
end
context 'nested descendants' do
before do
@set = @evaluator.evaluate('descendant::c')
end
it_behaves_like :node_set, :length => 1
example 'return the <c> node' do
@set[0].name.should == 'c'
end
end
context 'descendants of a specific node' do
before do
@set = @evaluator.evaluate('a/descendant::a')
end
it_behaves_like :node_set, :length => 1
example 'return the second <a> node' do
@set[0].should == @second_a
end
end
context 'invalid descendants' do
before do
@set = @evaluator.evaluate('descendant::foobar')
end
it_behaves_like :empty_node_set
end
end
end