67 lines
2.4 KiB
Common Lisp
67 lines
2.4 KiB
Common Lisp
;;;; wh-engine/actor-macros.lisp
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(in-package wh-engine)
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(defvar *new!-impl-alist* ()
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"Alist of special implementations for new!")
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(defmacro define-new!-impl (class (class-var it-var params-var) &body body)
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"Define a special implementation for new!, which returns (values other-forms make-params)."
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`(push (cons (find-class ',class)
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(lambda (,class-var ,it-var ,params-var) ,@body))
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*new!-impl-alist*))
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(defmacro new! (class &rest params &key &allow-other-keys)
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"Create a new instance of class, as specified by params."
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(let ((impl (cdr (assoc-if (lambda (x) (subtypep x class)) *new!-impl-alist*)))
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(it (gensym)))
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(if impl
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(multiple-value-bind (other-forms make-params)
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(funcall impl class it params)
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`(let ((,it (make-instance ',class ,@make-params))) ,@other-forms ,it))
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`(make-instance ',class ,@params))
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))
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(define-new!-impl actor (class it params)
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(declare (ignore class))
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(loop for (key value) on params by #'cddr
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if (eq key :component)
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collect `(o! ,it (add-component ,value)) into other-forms
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else
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if (eq key :child)
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collect `(o! ,it (add-child ,value)) into other-forms
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else
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if (eq key :parent)
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collect `(o! ,value (add-child ,it)) into other-forms
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else
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nconc `(,key ,value) into make-params
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finally (return (values other-forms make-params))))
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#|
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(define-new!-impl component (class it params)
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(loop for (key value) on params by #'cddr
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if (eq key :actor)
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collect `(o! ,value (add-component ,it)) into other-forms
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else
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nconc `(,key ,value) into make-params
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finally (return (values other-forms make-params))))
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|#
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#|
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(defmacro actor! (class &rest params &key &allow-other-keys)
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(let* ((cons-form `(make-instance ',class))
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(it (gensym))
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(other-forms
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(loop for (key value) on params by #'cddr
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if (eq key :component)
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collect `(o! ,it (add-component ,value))
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else
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if (eq key :child)
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collect `(o! ,it (add-child ,value))
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else
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do (nconc cons-form `(,key ,value)))))
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`(let ((,it ,cons-form)) ,@other-forms ,it)))
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(defmacro component! (class &rest params &key &allow-other-keys)
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`(make-instance ',class ,@params))
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|#
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