Class: SpecialObject

Inherits:
YAMLParser show all
Defined in:
lib/yaml-parser.rb

Instance Method Summary collapse

Methods inherited from YAMLParser

#hash, parse

Constructor Details

#initialize(hash) ⇒ SpecialObject

Save the input object in an instance variable



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# File 'lib/yaml-parser.rb', line 30

def initialize(hash)
  @object_hash = hash
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(meth_sym, *args, &block) ⇒ Object

Catch missing method errors here and try to build the ones we need



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# File 'lib/yaml-parser.rb', line 35

def method_missing(meth_sym, *args, &block)

  # If the object that has been passed in is an array, we have to treat it differently
  if @object_hash.class == Array

    # We only need to cover the first and last methods for the arrays, so we are going to
    # check what the user called and act accordingly
    if meth_sym.to_s == "first"

      # If the array.first call returns a string (as opposed to other data types) then that is the answer we want to return
      # Otherwise return a ew SpecialObject with the modified object as the argument
      @object_hash[0].class == String ? @object_hash[0] : SpecialObject.new(@object_hash[0])
    else
      @object_hash[-1].class == String ? @object_hash[-1] : SpecialObject.new(@object_hash[-1])
    end

  # If the user tries to access the hash with the [] operator, let them, and just return a hash
  elsif meth_sym.to_s == "[]"
    @object_hash[*args]

  # If the hash has a key that is the same as the method they called, return the value
  elsif @object_hash[meth_sym.to_s]

    # If the key has a value that is a string, that is the last step in the chain. Otherwise, return a new special object
    @object_hash[meth_sym.to_s].class == String ? @object_hash[meth_sym.to_s] : SpecialObject.new(@object_hash["#{meth_sym}"])
  
  # If none of the above is true, throw a no method error
  else
    super
  end
end

Instance Method Details

#respond_to?(meth_sym, private_method = false) ⇒ Boolean

Make sure we respond to the new methods we are creating

Returns:

  • (Boolean) 


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# File 'lib/yaml-parser.rb', line 68

def respond_to?(meth_sym, private_method = false)
  true
end