Class: ReportsKit::RelativeTime

Inherits:
Object
  • Object
show all
Defined in:
lib/reports_kit/relative_time.rb

Constant Summary collapse

LETTERS_DURATION_METHODS = 
{
  'y' => :years,
  'M' => :months,
  'w' => :weeks,
  'd' => :days,
  'h' => :hours,
  'm' => :minutes,
  's' => :seconds
}
LETTERS = 
LETTERS_DURATION_METHODS.keys.join

Class Method Summary collapse

Class Method Details

.parse(string, prevent_exceptions: false) ⇒ Object 



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# File 'lib/reports_kit/relative_time.rb', line 14

def self.parse(string, prevent_exceptions: false)
  return Time.zone.now if string == 'now'
  original_string = string
  string = string.to_s.strip
  is_negative = string[0, 1] == '-'
  string = string[1..-1] if is_negative

  result_string = is_negative ? '-' : ''
  result_durations = []

  string.scan(/(\d+)([#{LETTERS}]?)/) do |number, letter|
    result_string += "#{number}#{letter}"
    duration_method = LETTERS_DURATION_METHODS[letter]
    unless duration_method
      return if prevent_exceptions
      raise ArgumentError.new("Invalid duration letter: #{letter.inspect}")
    end
    result_durations << number.to_i.public_send(duration_method)
  end

  if result_string == '-' || result_string != original_string.to_s.strip
    return if prevent_exceptions
    raise ArgumentError.new("Invalid time duration: #{original_string.inspect}")
  end
  duration = result_durations.reduce(&:+)
  is_negative ? duration.ago : duration.from_now
end