rb.hash_regex_helpers.rb Maven / Gradle / Ivy

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module HashRegexHelpers
  def extract_string_hash_value(data, key)
    extract_hash_value(data, key, /['"](?[^'"]*)['"]/)
  end

  def extract_symbol_hash_value(data, key)
    extract_hash_value(data, key, /:(?[a-zA-Z@$_][a-zA-Z0-9_]*[a-zA-Z_=?!]?)/)
  end

  def extract_numeric_hash_value(data, key)
    extract_hash_value(data, key, /(?\d+)/)
  end

  def extract_hash_value(data, key, value)
    value_regex = nil

    if value.is_a?(String)
      value_regex = "['\"](?#{value})['\"]"
    elsif value.is_a?(Regexp)
      # Trim leading and trailing /. /a/ --> a
      value_regex = value.inspect[1,value.inspect.size-2]
    else
      value_regex = "(?#{value.inspect})"
    end

    # regex = /(key: (?#{value_regex}))|(:key => (?))/
    matches = /#{key.to_s}(:|\s*=>)\s*#{value_regex}/.match(data)

    return nil if matches.nil?
    matches['value']
  end
end