Module: Aspera::Yaml

Defined in:
lib/aspera/yaml.rb

Class Method Summary collapse

Class Method Details

.find_duplicate_keys(node, parent_path = nil, duplicate_keys = nil) ⇒ Array<String>

Returns List of duplicate keys with their paths and occurrences.

Parameters:

  • node (Psych::Nodes::Node) —

    YAML node

  • parent_path (Array<String>) (defaults to: nil) —

    Path of parent keys

  • duplicate_keys (Array<Hash>) (defaults to: nil) —

    Accumulated duplicate keys

Returns:

  • (Array<String>) —

    List of duplicate keys with their paths and occurrences



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# File 'lib/aspera/yaml.rb', line 11

def find_duplicate_keys(node, parent_path = nil, duplicate_keys = nil)
  duplicate_keys ||= []
  parent_path ||= []
  return duplicate_keys unless node.respond_to?(:children)
  if node.is_a?(Psych::Nodes::Mapping)
    counts = Hash.new(0)
    key_nodes = Hash.new{ |h, k| h[k] = []}
    node.children.each_slice(2) do |key_node, value_node|
      if key_node&.value
        counts[key_node.value] += 1
        key_nodes[key_node.value] << key_node
        find_duplicate_keys(value_node, parent_path + [key_node.value], duplicate_keys)
      end
    end
    counts.each do |key_str, count|
      next if count <= 1
      path = (parent_path + [key_str]).join('.')
      occurrences = key_nodes[key_str].map{ |kn| kn.start_line ? kn.start_line + 1 : 'unknown'}.join(', ')
      duplicate_keys << "#{path}: #{occurrences}"
    end
  else
    node.children.to_a.each{ |child| find_duplicate_keys(child, parent_path, duplicate_keys)}
  end
  duplicate_keys
end

.safe_load(yaml) ⇒ Object

Safely load YAML content raising an error if duplicate keys are found Validates the yaml, and then call YAML.safe_load

Parameters:

  • yaml (String) —

    YAML content

Returns:

  • (Object) —

    Parsed YAML content

Raises:

  • (RuntimeError) —

    If duplicate keys are found



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# File 'lib/aspera/yaml.rb', line 43

def safe_load(yaml)
  duplicate_keys = find_duplicate_keys(Psych.parse_stream(yaml))
  raise "Duplicate keys: #{duplicate_keys.join('; ')}" unless duplicate_keys.empty?
  YAML.safe_load(yaml, permitted_classes: [Time, Date, Symbol])
end