Class: StringEnumerator

Inherits:
Object
  • Object
show all
Defined in:
lib/string_enumerator.rb,
lib/string_enumerator/version.rb

Constant Summary collapse

VERSION = 
"0.1.0"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(replacements) ⇒ StringEnumerator

Returns a new instance of StringEnumerator.



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# File 'lib/string_enumerator.rb', line 4

def initialize(replacements)
  @replacements = replacements.inject({}) do |memo, (k, v)|
    memo[k.to_s] = v
    memo
  end
end

Instance Attribute Details

#end_mark ⇒ Object 



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

def end_mark
  @end_mark || ']'
end

#replacements ⇒ Object (readonly)

Returns the value of attribute replacements.



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# File 'lib/string_enumerator.rb', line 11

def replacements
  @replacements
end

#start_mark ⇒ Object 



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# File 'lib/string_enumerator.rb', line 14

def start_mark
  @start_mark || '['
end

Instance Method Details

#enumerate(str) ⇒ Object

Get all the possible enumerations of str given the replacements you defined



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# File 'lib/string_enumerator.rb', line 24

def enumerate(str)
  enumerations = [str] # seed it
  str.scan(pattern) do |placeholder|
    placeholder = placeholder[0]
    if r = replacements[placeholder]
      # "recursion"
      enumerations = enumerations.map do |e|
        r.map { |replacement| e.gsub(%{#{start_mark}#{placeholder}#{end_mark}}, replacement) }
      end.flatten
    end
  end
  enumerations
end