Class: String

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

Instance Method Summary collapse

Instance Method Details

#interpolate(args, in_place = false) ⇒ Object

Allows various forms of string interpolation. Addd to make it easier to dynamically replace YAML config values; howerver, this will likely come in handy elsewhere.

Examples:

"Hello! My name is ?".interpolate("Nathan Hopkins")
"Hello! My first name is ? and my last name is ?".interpolate(["Nathan", "Hopkins"])
'Hello! My first name is {first_name} and my last name is {last_name}'.interpolate(:first_name => "Nathan", :last_name => "Hopkins")

Params

  • args [Symbol, String, Array, Hash] The value(s) used to replace segments of the string.

  • in_place [Boolean] Indicates if the value should edited in place. Be careful when doing this, you may end up with unexpected results!

Returns

The new string after interpolation.



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# File 'lib/string.rb', line 19

def interpolate(args, in_place=false)
  args = [args] unless args.is_a?(Array) || args.is_a?(Hash)

  if args.is_a?(Array)
    x = -1

    if in_place
      self.gsub!(/\?/) do |s|
        x += 1
        args[x]
      end
    else
      return self.gsub(/\?/) do |s|
        x += 1
        args[x]
      end
    end
  elsif args.is_a?(Hash)
    if in_place
      args.each {|k, v| self.gsub!(/\{#{k.to_s}\}/i, v.to_s)}
    else
      new_string = String.new(self)
      args.each {|k, v| new_string.gsub!(/\{#{k.to_s}\}/i, v.to_s)}
      return new_string
    end
  end

  return self
end