chop.rb #1

#
#  chop.rb
#

module Puppet::Parser::Functions
  newfunction(:chop, :type => :rvalue, :doc => <<-'EOS'
    Returns a new string with the last character removed. If the string ends
    with `\r\n`, both characters are removed. Applying chop to an empty
    string returns an empty string. If you wish to merely remove record
    separators then you should use the `chomp` function.
    Requires a string or array of strings as input.
    EOS
  ) do |arguments|

    raise(Puppet::ParseError, "chop(): Wrong number of arguments " +
      "given (#{arguments.size} for 1)") if arguments.size < 1

    value = arguments[0]
    klass = value.class

    unless [Array, String].include?(klass)
      raise(Puppet::ParseError, 'chop(): Requires either an ' +
        'array or string to work with')
    end

    if value.is_a?(Array)
      # Numbers in Puppet are often string-encoded which is troublesome ...
      result = value.collect { |i| i.is_a?(String) ? i.chop : i }
    else
      result = value.chop
    end

    return result
  end
end

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