class ERBLint::Linters::ArgumentMappers::Helpers::ErbBlock

def any?(attribute)
  erb_blocks(attribute).any?
end

def basic?(attribute)
  return false if erb_blocks(attribute).size != 1
  attribute.value.match?(INTERPOLATION_REGEX)
end

def convert(attribute)
  raise_error(attribute) unless interpolation?(attribute)
  if any?(attribute)
    convert_interpolation(attribute)
  else
    attribute.value.to_json
  end
end

def convert_interpolation(attribute)
  if basic?(attribute)
    m = attribute.value.match(INTERPOLATION_REGEX)
    return m[:rb].strip
  end
  # we use `source` instead of `value` because it does not convert encoded HTML entities.
  attribute.value_node.loc.source.gsub("<%=", '#{').gsub("%>", "}")
end

def erb_blocks(attribute)
  (attribute.value_node&.children || []).select { |n| n.try(:type) == :erb }
end

def interpolation?(attribute)
  erb_blocks(attribute).all? do |erb|
    # If the blocks does not have an indicator, it's not an interpolation.
    erb.children.to_a.compact.any? { |node| node.type == :indicator }
  end
end

def raise_error(attribute)
  raise ERBLint::Linters::ArgumentMappers::ConversionError, "Cannot convert attribute \"#{attribute.name}\" because its value contains an erb block"
end

def raise_if_erb_block(attribute)
  raise_error(attribute) if any?(attribute)
end