Module: YamlMerge

Extended by:
YamlMerge
Included in:
YamlMerge
Defined in:
lib/build-labels/yaml_merge.rb

Instance Method Summary collapse

Instance Method Details

#deep_copy_without_aliases(obj) ⇒ Object 



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# File 'lib/build-labels/yaml_merge.rb', line 62

def deep_copy_without_aliases(obj)
  case obj
  when Hash
    obj.transform_values { |v| deep_copy_without_aliases(v) }
  when Array
    obj.map { |v| deep_copy_without_aliases(v) }
  else
    obj
  end
end

#deep_merge(base, override) ⇒ Object 



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# File 'lib/build-labels/yaml_merge.rb', line 7

def deep_merge(base, override)
  result = base.dup
  override.each do |key, value|
    if value.is_a?(Hash) && result[key].is_a?(Hash)
      result[key] = deep_merge(result[key], value)
    elsif value.is_a?(Array) && result[key].is_a?(Array)
      result[key] = (result[key] + value).uniq
    else
      result[key] = value
    end
  end
  result
end

#parse_and_process_yaml(yaml_string) ⇒ Object 



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# File 'lib/build-labels/yaml_merge.rb', line 57

def parse_and_process_yaml(yaml_string)
  parsed = Psych.parse(yaml_string)
  process_yaml(parsed.root)
end

#process_yaml(node, anchors = {}) ⇒ Object 



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# File 'lib/build-labels/yaml_merge.rb', line 21

def process_yaml(node, anchors = {})
  case node
  when Psych::Nodes::Mapping
    result = {}
    node.children.each_slice(2) do |key, value|
      processed_key = process_yaml(key, anchors)
      processed_value = process_yaml(value, anchors)
      if key.is_a?(Psych::Nodes::Scalar) && key.anchor
        anchors[key.anchor.to_sym] = processed_value
      end
      if processed_key == '<<'
        if processed_value.is_a?(Array)
          processed_value.each { |v| result = deep_merge(v, result) }
        else
          result = deep_merge(processed_value, result)
        end
      elsif result.key?(processed_key) && result[processed_key].is_a?(Array) && processed_value.is_a?(Array)
        result[processed_key] = (result[processed_key] + processed_value).uniq
      else
        result[processed_key] = processed_value
      end
    end
    node.anchor ? anchors[node.anchor.to_sym] = result : result
  when Psych::Nodes::Sequence
    result = node.children.map { |child| process_yaml(child, anchors) }
    node.anchor ? anchors[node.anchor.to_sym] = result : result
  when Psych::Nodes::Scalar
    result = node.value
    node.anchor ? anchors[node.anchor.to_sym] = result : result
  when Psych::Nodes::Alias
    anchors[node.anchor.to_sym] || node.anchor
  else
    node
  end
end