Class: Numeric

Inherits:
Object
  • Object
show all
Defined in:
lib/fat_core/numeric.rb

Instance Method Summary collapse

Instance Method Details

#commas(places = nil) ⇒ Object

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# File 'lib/fat_core/numeric.rb', line 12

def commas(places = nil)
  # By default, use zero places for whole numbers; four places for
  # numbers containing a fractional part to 4 places.
  if places.nil?
    if self.abs.modulo(1).round(4) > 0.0
      places = 4
    else
      places = 0
    end
  end
  group(places, ',')
end

#group(places = 0, delim = ',') ⇒ Object

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# File 'lib/fat_core/numeric.rb', line 25

def group(places = 0, delim = ',')
  # Return number as a string with embedded commas
  # for nice printing; round to places places after
  # the decimal

  # Only convert to string numbers with exponent unless they are
  # less than 1 (to ensure that really small numbers round to 0.0)
  if self.abs > 1.0 && self.to_s =~ /e/
    return self.to_s
  end

  str = self.to_f.round(places).to_s

  # Break the number into parts
  str =~ /^(-)?(\d*)((\.)?(\d*))?$/
  neg = $1 || ''
  whole = $2
  frac = $5

  # Pad out the fractional part with zeroes to the right
  n_zeroes = [places - frac.length, 0].max
  frac += "0" * n_zeroes if n_zeroes > 0

  # Place the commas in the whole part only
  whole = whole.reverse
  whole.gsub!(/([0-9]{3})/, "\\1#{delim}")
  whole.gsub!(/#{Regexp.escape(delim)}$/, '')
  whole.reverse!
  if frac.nil? || places <= 0
    return neg + whole
  else
    return neg + whole + '.' + frac
  end
end

#int_if_whole ⇒ Object

Return an integer type, but only if the fractional part of self is zero

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# File 'lib/fat_core/numeric.rb', line 62

def int_if_whole
  self.floor == self ? self.floor : self
end

#secs_to_hms ⇒ Object

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# File 'lib/fat_core/numeric.rb', line 66

def secs_to_hms
  frac = self % 1
  mins, secs = self.divmod(60)
  hrs, mins = mins.divmod(60)
  if frac.round(5) > 0.0
    "%02d:%02d:%02d.%d" % [hrs, mins, secs, frac.round(5) * 100]
  else
    "%02d:%02d:%02d" % [hrs, mins, secs]
  end
end

#signum ⇒ Object

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# File 'lib/fat_core/numeric.rb', line 2

def signum
  if self > 0
    1
  elsif self < 0
    -1
  else
    0
  end
end

#tex_quote ⇒ Object

Allow erb documents can directly interpolate numbers

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# File 'lib/fat_core/numeric.rb', line 78

def tex_quote
  to_s
end