Module: Hirb::Colors::StringUtil

Defined in:
lib/hirb/colors/string_util.rb

Constant Summary collapse

COLORIZED_REGEX = 
/\e\[(\d|;)+m/

Instance Method Summary collapse

Instance Method Details

#ljust(string, desired_length) ⇒ Object 



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# File 'lib/hirb/colors/string_util.rb', line 29

def ljust(string, desired_length)
  leftover = desired_length - size(string)
  leftover > 0 ? string + " " * leftover : string
end

#rjust(string, desired_length) ⇒ Object 



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# File 'lib/hirb/colors/string_util.rb', line 12

def rjust(string, desired_length)
  leftover = desired_length - size(string)
  leftover > 0 ? " " * leftover + string : string
end

#size(string) ⇒ Object 



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# File 'lib/hirb/colors/string_util.rb', line 8

def size(string)
  string.gsub(COLORIZED_REGEX, '').scan(/./).length
end

#slice(*args) ⇒ Object 



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# File 'lib/hirb/colors/string_util.rb', line 17

def slice(string, start, finish)
  if string =~ COLORIZED_REGEX
    slice_colorized_string(string, start, finish)
  else
    string.scan(/./).slice(start, finish).join('')
  end
end

#slice_colorized_string(string, slice_start, slice_end) ⇒ Object 



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# File 'lib/hirb/colors/string_util.rb', line 53

def slice_colorized_string(string, slice_start, slice_end)
  # store the codes and their position in the original string
  markers = []
  string.scan(COLORIZED_REGEX) do |code|
    marker = { :code     => code,
               :position => Regexp.last_match.offset(0).first
    }
    markers << marker
  end

  markers_before_slice = []
  markers_in_slice     = []
  markers_after_slice  = []
  # interate over elements in code_markers
  # will be mutating array so cannot use .each
  markers.size.times do
    marker = markers.shift
    # shift remaining markers position by that of the popped code
    markers.map! { |c| c[:position] -= marker[:code].size; c }
    if marker[:position] <= slice_start
      markers_before_slice << marker
    elsif marker[:position] > slice_start && marker[:position] < slice_end
      markers_in_slice << marker
    else
      markers_after_slice << marker
    end
  end

  # slice the string without the codes
  slice = string.gsub(COLORIZED_REGEX, '').slice(slice_start, slice_end)

  # insert codes back into the slice
  markers_in_slice.each do |marker|
    slice.insert(marker[:position], marker[:code])
    markers_in_slice.map! { |c| c[:position] += marker[:code].size; c }
  end

  markers_before_slice.each { |marker| slice.insert(0, marker[:code])}
  markers_after_slice.each { |marker| slice << marker[:code] }

  slice
end