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     ((type :initarg :type
  48            :initform 'string
  49            :accessor attribute-editor-type)
  50      (parser :initarg :parse-using
  51              :initform 'identity
  52              :accessor attribute-editor-parsing-function)
  53      (prompt :initarg :prompt
  54              :initform nil)
  55      (unbound-value
  56          :initarg :unbound-value
  57        :initform "")))
  58
  59
  60
  61 (defclass string-attribute-editor (attribute-editor) ())
  62 (defclass text-attribute-editor (string-attribute-editor) ())
  63
  64 (deftype password () 'string)
  65
  66 (defclass password-attribute-editor (string-attribute-editor) ())
  67
  68 (defclass number-attribute-editor (attribute-editor) ()
  69   (:default-initargs
  70    :parse-using 'parse-number:PARSE-NUMBER
  71    :type 'number))
  72
  73 (defun parse-attribute-value (attribute value)
  74   (funcall (attribute-editor-parsing-function
  75                     (attribute-editor attribute))
  76            value))
  77
  78 (define-layered-function display-attribute-editor (attribute)
  79   (:method (attribute)
  80     (setf (attribute-value attribute)
  81           (funcall (attribute-editor-parsing-function
  82                     (attribute-editor attribute))
  83                    (read-line)))))
  84
  85 (define-description T ()
  86   ((editp :label "Edit by Default?"
  87           :value nil
  88           :editp nil)
  89    (identity :editp nil)
  90    (type :editp nil)
  91    (class :editp nil))
  92   (:in-description editable))
  93
  94 (define-layered-method (setf attribute-value-using-object)
  95  :in-layer #.(defining-description 'editable)(value object attribute)
  96
  97  (let ((setter (attribute-setter attribute)))
  98    (if setter
  99        (funcall setter value object)
 100        (error "No setter in ~A for ~A" attribute object))))
 101
 102
 103 (define-layered-function attribute-editp (attribute)
 104   (:method (attribute) nil))
 105
 106 (define-layered-method attribute-editp
 107   :in-layer #.(defining-description 'editable)
 108   ((attribute standard-attribute))
 109   (let ((value (attribute-value attribute)))
 110   (unless (or (unbound-slot-value-p value)
 111               (typep value
 112                      (attribute-editor-type
 113                       (attribute-editor attribute))))
 114     (return-from attribute-editp nil)))
 115   (let ((edit?       (call-next-method)))
 116     (if (eq :inherit edit?)
 117         (attribute-value (find-attribute
 118                           (attribute-description attribute)
 119                           'editp))
 120         edit?)))
 121
 122
 123 (define-layered-method display-attribute-value
 124   :in-layer #.(defining-description 'editable)
 125   ((attribute standard-attribute))
 126   (if (attribute-editp attribute)
 127       (display-attribute-editor attribute)
 128       (call-next-method)))
 129
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