Class: XmlNodeStream::Selector::Matcher

Inherits:
Object
  • Object
show all
Defined in:
lib/xml_node_stream/selector.rb

Overview

Match a partial path to a node.

Instance Method Summary collapse

Constructor Details

#initialize(path) ⇒ Matcher

Create a new Matcher.

Parameters:

  • path (String) —

    the path pattern to match



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# File 'lib/xml_node_stream/selector.rb', line 142

def initialize(path)
  @path = path
  @text = (path == "text()")
  @extractor = case path
  when "text()"
    lambda { |node| node.value unless node.value.nil? || node.value.empty? }
  when "%"
    lambda { |node| node.descendants }
  when "*"
    lambda { |node| node.children }
  when "."
    lambda { |node| node }
  when ".."
    lambda { |node| node.parent || [] }
  when ""
    lambda { |node|
      root = Node.new(nil)
      root.children << node.root
      root
    }
  when /^%(.+)$/  # descendants with name filter: %name
    name = $1
    lambda { |node| node.descendants.select { |d| d.name == name } }
  else
    lambda { |node| node.children.select { |child| child.name == @path } }
  end
end

Instance Method Details

#select(context_nodes) ⇒ Array<Node>

Select all nodes that match a partial path.

Parameters:

  • context_nodes (Array<Node>) —

    the nodes to select from

Returns:

  • (Array<Node>) —

    the matching nodes



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# File 'lib/xml_node_stream/selector.rb', line 174

def select(context_nodes)
  results = context_nodes.collect { |node| @extractor.call(node) if node.is_a?(Node) }.flatten.compact
  # Text values from different nodes can legitimately be equal, so only dedupe nodes.
  @text ? results : results.uniq
end