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cl-dbind.lisp
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cl-dbind.lisp
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;;;; cl-dbind.lisp
(in-package #:cl-dbind)
;;; "cl-dbind" goes here. Hacks and glory await!
(defun interned-p (sym)
(find-symbol (symbol-name sym)))
(defun construct-dbind (vars ls body)
`(dbind ,vars ,ls ,@body))
(defmacro dbind (vars list &body body)
(let ((gensyms ()))
(labels
((process-symbol (sym)
(if (atom sym)
(case sym
(_ (let ((s (gensym)))
(push s gensyms)
s))
(t sym))
(process-list sym)))
(process-list (ls)
(if (atom ls)
(process-symbol ls)
(cons (process-symbol (car ls))
(process-list (cdr ls))))))
(let ((new-vars (process-list vars)))
`(destructuring-bind ,new-vars
,list
(declare (ignore ,@gensyms))
,@body)))))
(defmacro dbinding (def name vars &rest body)
(let ((list-vars ()))
(labels
((gensym-list-var (var)
(if (consp var)
(let ((s (gensym)))
(push var list-vars)
(push s list-vars)
s)
var)))
(let ((new-vars (mapcar #'gensym-list-var vars)))
(labels
((dbind-list-vars (lis)
(let ((item (car lis))
(nxt (member-if-not #'interned-p (cdr lis))))
(construct-dbind
(getf list-vars item)
item
(if (null nxt)
body
`(,(dbind-list-vars nxt)))))))
`(,def ,name ,new-vars
,(dbind-list-vars (member-if-not #'interned-p new-vars))))))))
(defmacro with-dbind-vars (vars-place body-place statement)
(let* ((vars (nth vars-place statement))
(body (nthcdr body-place statement))
(st (butlast statement (length body)))
(list-vars ()))
(labels
((gensym-list-var (var)
(if (consp var)
(let ((s (gensym)))
(push var list-vars)
(push s list-vars)
s)
var))
(dbind-list-vars (lis)
(let ((item (car lis))
(nxt (member-if-not #'interned-p (cdr lis))))
(construct-dbind
(getf list-vars item)
item
(if (null nxt)
body
`(,(dbind-list-vars nxt))))))
(generate-dbinds (lis)
`(,(dbind-list-vars (member-if-not #'interned-p lis)))))
(let ((new-vars (mapcar #'gensym-list-var vars)))
(setf (nth vars-place st) new-vars)
`,(nconc st (generate-dbinds new-vars))))))