```ruby
class Peeek
  class Calls < Array

    # Filter the calls by name of a file.
    #
    # @param [String, Regexp] file name or pattern of a file
    # @return [Peeek::Calls] filtered calls
    def in(file)
      select { |call| file === call.file }
    end

    # Filter the calls by line number.
    #
    # @param [Number] line line number
    # @return [Peeek::Calls] filtered calls
    def at(line)
      select { |call| call.line == line }
    end

    # Filter the calls by a receiver.
    #
    # @param [Module, Class, Object] receiver
    # @return [Peeek::Calls] filtered calls
    def from(receiver)
      select { |call| call.receiver == receiver }
    end

  end
end
```

Return a instance of Peeek::Calls
user
```ruby
class Peeek
  class Calls < Array

    # Filter the calls by name of a file.
    #
    # @param [String, Regexp] file name or pattern of a file
    # @return [Peeek::Calls] filtered calls
    def in(file)
      Calls.new(select { |call| file === call.file })
    end

    # Filter the calls by line number.
    #
    # @param [Number] line line number
    # @return [Peeek::Calls] filtered calls
    def at(line)
      Calls.new(select { |call| call.line == line })
    end

    # Filter the calls by a receiver.
    #
    # @param [Module, Class, Object] receiver
    # @return [Peeek::Calls] filtered calls
    def from(receiver)
      Calls.new(select { |call| call.receiver == receiver })
    end

  end
end
```
assistant