Method: JSI::JSON::Pointer#evaluate

Defined in:
lib/jsi/json/pointer.rb

#evaluate(document) ⇒ Object

takes a root json document and evaluates this pointer through the document, returning the value pointed to by this pointer.

Parameters:

  • document (#to_ary, #to_hash) —

    the document against which we will evaluate this pointer

Returns:

  • (Object) —

    the content of the document pointed to by this pointer

Raises:



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# File 'lib/jsi/json/pointer.rb', line 84

def evaluate(document)
  res = reference_tokens.inject(document) do |value, token|
    if value.respond_to?(:to_ary)
      if token.is_a?(String) && token =~ /\A\d|[1-9]\d+\z/
        token = token.to_i
      end
      unless token.is_a?(Integer)
        raise(ReferenceError, "Invalid resolution for #{to_s}: #{token.inspect} is not an integer and cannot be resolved in array #{value.inspect}")
      end
      unless (0...(value.respond_to?(:size) ? value : value.to_ary).size).include?(token)
        raise(ReferenceError, "Invalid resolution for #{to_s}: #{token.inspect} is not a valid index of #{value.inspect}")
      end
      (value.respond_to?(:[]) ? value : value.to_ary)[token]
    elsif value.respond_to?(:to_hash)
      unless (value.respond_to?(:key?) ? value : value.to_hash).key?(token)
        raise(ReferenceError, "Invalid resolution for #{to_s}: #{token.inspect} is not a valid key of #{value.inspect}")
      end
      (value.respond_to?(:[]) ? value : value.to_hash)[token]
    else
      raise(ReferenceError, "Invalid resolution for #{to_s}: #{token.inspect} cannot be resolved in #{value.inspect}")
    end
  end
  res
end