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make attrs modifiable

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This commit is contained in:
Bo Yao 2018-06-27 10:01:18 -04:00
parent 89421640da
commit 91f4a2bd9f
1 changed files with 23 additions and 3 deletions
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26
src/flute.lisp
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@ -58,6 +58,18 @@
(defstruct attrs alist)
;;; TODO make it setf
(defmethod set-attr ((attrs attrs) key value)
)
(defmethod delete-attr ((attrs attrs) key value)
)
(defmethod get-attr ((attrs attrs))
)
; (defmethod set-attr ((element element) key value))
(defun split-attrs-and-children (attrs-and-children)
(cond
((attrs-p (first attrs-and-children))
@ -150,19 +162,27 @@
(defmacro! define-element (name (&rest args) &body body)
`(defun ,name (&rest ,g!attrs-and-children)
(multiple-value-bind (,g!attrs children)
(multiple-value-bind (,g!attrs ,g!children)
(split-attrs-and-children ,g!attrs-and-children)
(let ,(mapcar (lambda (arg)
(list arg `(cdr (assoc (make-keyword ',arg) (attrs-alist ,g!attrs)))))
args)
(make-user-element :tag (string-downcase ',name) :attrs ,g!attrs
:children children :expand-to (progn ,@body))))))
:children ,g!children
:expand-to
(lambda (tag attrs children)
(declare (ignorable tag attrs children))
(progn ,@body)))))))
(defvar *expand-user-element* t)
(defmethod print-object ((element user-element) stream)
(if *expand-user-element*
(print-object (user-element-expand-to element) stream)
(print-object (funcall (user-element-expand-to element)
(element-tag element)
(element-attrs element)
(element-children element))
stream)
(call-next-method)))
(defun tree-leaves%% (tree test result)