73 lines
2.3 KiB
Common Lisp
73 lines
2.3 KiB
Common Lisp
(defpackage #:hsx/dsl
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(:use #:cl)
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(:import-from #:alexandria
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#:make-keyword
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#:symbolicate)
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(:import-from #:hsx/element
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#:create-element)
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(:export #:hsx
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#:deftag
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#:defcomp))
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(in-package #:hsx/dsl)
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;;;; hsx macro
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(defmacro hsx (form)
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"Detect built-in HSX elements and automatically import them."
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(find-builtin-symbols form))
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(defun find-builtin-symbols (node)
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(if (atom node)
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(or (and (symbolp node)
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(not (keywordp node))
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(find-symbol (string node) :hsx/builtin))
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node)
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(cons (find-builtin-symbols (car node))
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(mapcar (lambda (n)
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(if (listp n)
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(find-builtin-symbols n)
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n))
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(cdr node)))))
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;;;; defhsx macro
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(defmacro defhsx (name element-type)
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`(defmacro ,name (&body body)
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`(%create-element ,',element-type ,@body)))
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(defun %create-element (type &rest body)
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(multiple-value-bind (props children)
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(parse-body body)
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(create-element type props children)))
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(defun parse-body (body)
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(cond ((and (listp (first body))
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(keywordp (first (first body))))
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(values (first body) (rest body)))
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((keywordp (first body))
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(loop :for thing :on body :by #'cddr
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:for (k v) := thing
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:when (and (keywordp k) v)
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:append (list k v) :into props
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:when (not (keywordp k))
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:return (values props thing)
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:finally (return (values props nil))))
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(t (values nil body))))
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(defmacro deftag (name)
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`(eval-when (:compile-toplevel :load-toplevel :execute)
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(defhsx ,name ,(make-keyword name))))
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(defmacro defcomp (name props &body body)
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"Define a function component for use in HSX.
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The props must be declared with either &key or &rest (or both).
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The body must return an HSX element."
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(unless (or (null props)
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(member '&key props)
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(member '&rest props))
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(error "Component properties must be declared with either &key, &rest, or both."))
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(let ((%name (symbolicate '% name)))
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`(eval-when (:compile-toplevel :load-toplevel :execute)
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(defun ,%name ,props
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,@body)
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(defhsx ,name (fdefinition ',%name)))))
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