src/standard-descriptions/edit.lisp

   1 (in-package :lisp-on-lines)
   2
   3 (define-description editable ()
   4   ()
   5   (:mixinp t))
   6
   7 (define-layered-class standard-attribute
   8   :in-layer #.(defining-description 'editable)
   9   ()
  10   ((edit-attribute-p
  11     :initform :inherit
  12     :layered-accessor attribute-editp
  13     :initarg :editp
  14     :layered t)
  15    (setter
  16     :initarg :setter
  17     :layered t
  18     :accessor attribute-setter
  19     :initform nil)
  20    (attribute-editor
  21     :initarg :editor
  22     :layered t
  23     :accessor attribute-editor
  24     :initform (make-instance 'attribute-editor)
  25     :documentation "This ones a bit odd")))
  26
  27 (defmethod shared-initialize :after ((object standard-attribute)
  28                                       slots &rest args &key input &allow-other-keys)
  29
  30   (when input
  31     (setf (attribute-editor object)
  32           (apply #'make-instance (find-editor-class input)
  33                  input))))
  34
  35
  36 (defun find-editor-class (spec)
  37   (let ((class (getf spec :class))
  38         (type (getf spec :type)))
  39     (or class (when
  40                   (and type (symbolp type))
  41                 (let ((name (format nil "~A-~A" type 'attribute-editor)))
  42                   (or (find-class (intern name (symbol-package type)) nil)
  43                       (find-class (intern name) nil)
  44                       'string-attribute-editor))))))
  45
  46 (defclass attribute-editor ()
  47     ((class :initarg :class)
  48      (type :initarg :type
  49            :initform 'string
  50            :accessor attribute-editor-type)
  51      (parser :initarg :parse-using
  52              :initform 'identity
  53              :accessor attribute-editor-parsing-function)
  54      (prompt :initarg :prompt
  55              :initform nil)
  56      (unbound-value
  57          :initarg :unbound-value
  58        :initform "")))
  59
  60
  61
  62 (defclass string-attribute-editor (attribute-editor) ())
  63 (defclass text-attribute-editor (string-attribute-editor) ())
  64
  65 (deftype password () 'string)
  66
  67 (defclass password-attribute-editor (string-attribute-editor) ())
  68
  69 (defclass number-attribute-editor (attribute-editor) ()
  70   (:default-initargs
  71    :parse-using 'parse-number:PARSE-NUMBER
  72    :type 'number))
  73
  74 (defun parse-attribute-value (attribute value)
  75   (funcall (attribute-editor-parsing-function
  76                     (attribute-editor attribute))
  77            value))
  78
  79 (define-layered-function display-attribute-editor (attribute)
  80   (:method (attribute)
  81     (setf (attribute-value attribute)
  82           (funcall (attribute-editor-parsing-function
  83                     (attribute-editor attribute))
  84                    (read-line)))))
  85
  86 (define-description T ()
  87   ((editp :label "Edit by Default?"
  88           :value nil
  89           :editp nil)
  90    (identity :editp nil)
  91    (type :editp nil)
  92    (class :editp nil))
  93   (:in-description editable))
  94
  95 (define-layered-method (setf attribute-value-using-object)
  96  :in-layer #.(defining-description 'editable)(value object attribute)
  97
  98  (let ((setter (attribute-setter attribute)))
  99    (if setter
 100        (funcall setter value object)
 101        (error "No setter in ~A for ~A" attribute object))))
 102
 103
 104 (define-layered-function attribute-editp (attribute)
 105   (:method (attribute) nil))
 106
 107 (define-layered-method attribute-editp
 108   :in-layer #.(defining-description 'editable)
 109   ((attribute standard-attribute))
 110   (let ((value (attribute-value attribute)))
 111   (unless (or (unbound-slot-value-p value)
 112               (typep value
 113                      (attribute-editor-type
 114                       (attribute-editor attribute))))
 115     (return-from attribute-editp nil)))
 116   (let ((edit?       (call-next-method)))
 117     (if (eq :inherit edit?)
 118         (attribute-value (find-attribute
 119                           (attribute-description attribute)
 120                           'editp))
 121         edit?)))
 122
 123
 124 (define-layered-method display-attribute-value
 125   :in-layer #.(defining-description 'editable)
 126   ((attribute standard-attribute))
 127   (if (attribute-editp attribute)
 128       (display-attribute-editor attribute)
 129       (call-next-method)))
 130
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