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(defpackage :data-lens.wrapped-sequence
(:use :cl )
(:export ))
(in-package :data-lens.wrapped-sequence)
(defgeneric underlying (wrapper)
(:documentation "Return the underlying object of a wrapper"))
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(defgeneric key (tagged-sequence))
(defgeneric invert-key (tagged-sequence))
(defclass tagged-sequence (standard-object
org.shirakumo.trivial-extensible-sequences:sequence)
((%underlying-sequence :initarg :underlying :accessor underlying)))
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(defmethod org.shirakumo.trivial-extensible-sequences:length
((sequence tagged-sequence))
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(length (underlying sequence)))
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(defmethod org.shirakumo.trivial-extensible-sequences:elt
((sequence tagged-sequence) index)
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(funcall (key sequence)
(elt (underlying sequence)
index)))
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(defmethod (setf org.shirakumo.trivial-extensible-sequences:elt)
(new-value (sequence tagged-sequence) index)
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(setf (elt (underlying sequence)
index)
(funcall (invert-key sequence)
(elt (underlying sequence)
index)
new-value)))
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(defmethod org.shirakumo.trivial-extensible-sequences:adjust-sequence
((sequence tagged-sequence) length
&rest r
&key initial-element initial-contents)
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(declare (ignore initial-element initial-contents))
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(unless (slot-boundp sequence '%underlying-sequence)
(setf (underlying sequence) ()))
(fw.lu:prog1-bind (it (make-instance (class-of sequence)
:underlying (apply
#'org.shirakumo.trivial-extensible-sequences:adjust-sequence
(copy-seq (underlying sequence)) length
r)))
(describe it)))
(defmethod org.shirakumo.trivial-extensible-sequences:make-sequence-like
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((sequence tagged-sequence) length &rest r)
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(apply #'org.shirakumo.trivial-extensible-sequences:adjust-sequence
sequence length r))
(defun wrap-sequence (class seq)
(make-instance class
:underlying seq))
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