class String

def blank?
  self == ""
end

def column_of(index)
  return 1 if index == 0
  newline_index = rindex("\n", index - 1)
  if newline_index
    index - newline_index
  else
    index + 1
  end
end

def indent(n)
  if n >= 0
    gsub(/^/, ' ' * n)
  else
    gsub(/^ {0,#{-n}}/, "")
  end
end

def line_of(index)
  self[0...index].count("\n") + 1
end

def tabto(n)
  if self =~ /^( *)\S/
    indent(n - $1.length)
  else
    self
  end
end

def treetop_camelize
  to_s.gsub(/\/(.?)/){ "::" + $1.upcase }.gsub(/(^|_)(.)/){ $2.upcase }
end