Class: XmlUtils::XPath

Inherits:
Object
  • Object
show all
Defined in:
lib/xmlutils/xpath.rb

Class Method Summary collapse

Class Method Details

.apply_predicate(candidates, predicate) ⇒ Object 



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# File 'lib/xmlutils/xpath.rb', line 85

def self.apply_predicate(candidates, predicate)
  if predicate =~ /^\d+$/
    idx = predicate.to_i - 1
    idx >= 0 && candidates[idx] ? [candidates[idx]] : []
  elsif predicate =~ /^@(\S+)$/
    attr_name = $1
    candidates.select { |c| c.has_attribute?(attr_name) }
  elsif predicate =~ /^@(\S+)\s*=\s*['"]([^'"]*)['"]$/
    attr_name = $1
    attr_value = $2
    candidates.select { |c| c[attr_name] == attr_value }
  elsif predicate =~ /^contains\(\s*(\S+)\s*,\s*['"]([^'"]*)['"]\s*\)$/
    candidates # Simplified: not fully implemented
  else
    candidates
  end
end

.each(element, path, &block) ⇒ Object 



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# File 'lib/xmlutils/xpath.rb', line 42

def self.each(element, path, &block)
  match(element, path).each(&block)
end

.first(element, path) ⇒ Object 



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# File 'lib/xmlutils/xpath.rb', line 38

def self.first(element, path)
  match(element, path).first
end

.match(element, path) ⇒ Object 



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# File 'lib/xmlutils/xpath.rb', line 20

def self.match(element, path)
  return [element] if path.nil? || path.strip.empty? || path == '.'
  return [element] if path == '/'

  nodes = [element]
  parts = path.split('/').reject(&:empty?)

  parts.each do |part|
    new_nodes = []
    nodes.each do |node|
      new_nodes.concat(match_step(node, part))
    end
    nodes = new_nodes
  end

  nodes
end

.match_step(node, step) ⇒ Object 



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# File 'lib/xmlutils/xpath.rb', line 46

def self.match_step(node, step)
  return [] unless node.is_a?(Element) || node.is_a?(Document)

  if step == '*'
    return node.children.select { |c| c.is_a?(Element) }
  end

  if step == '..'
    return node.parent ? [node.parent] : []
  end

  if step.start_with?('@')
    attr_name = step[1..]
    if node.is_a?(Element)
      attr = node.attribute(attr_name)
      return attr ? [attr] : []
    end
    return []
  end

  if step.include?('[')
    name = step[/^[^\[]+/]
    predicate = step[/\[(.*?)\]/, 1]
  else
    name = step
    predicate = nil
  end

  if node.is_a?(Document)
    candidates = node.children.select { |c| c.is_a?(Element) && c.name == name }
  else
    candidates = node.children.select { |c| c.is_a?(Element) && c.name == name }
  end

  return candidates unless predicate

  apply_predicate(candidates, predicate)
end