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;;;; hypnotisml.lisp
(in-package #:hypnotisml)
;;; UTILITIES
(def:var *indent* :doc "Current indentation" :init 0)
(defun indent (stream &optional (indent *indent*))
(cl:loop :repeat indent :do (write-char #\space stream)))
(let ((counter 0)
(hostid (sxhash (list (lisp-implementation-type)
(lisp-implementation-version)
(machine-version)
(machine-type)
(software-version)
(uiop:hostname)))))
(defun make-uid ()
"returns a unique string"
(format nil "~36r~36r"
(sxhash (incf counter))
(sxhash (list (get-universal-time)
hostid)))))
;;; CLASSES
(deftype self-closing-tag ()
'(member
:area :base :br :col :embed
:hr :img :input :link :meta
:param :source :track :wbr))
(defun self-closing-elem-p (elem)
(typep (tag elem) 'self-closing-tag))
(defun keyword-plist-p (xs)
(and (listp xs)
(evenp (length xs))
(cl:loop
:for x :in xs :by #'cddr
:always (keywordp x)
:never (find x keys)
:collect x :into keys)))
(deftype keyword-plist ()
'(satisfies keyword-plist-p))
(defstruct styles list)
(defmethod print-object ((ob styles) stream)
(format stream "STYLE=~s" (styles-list ob)))
(def:class dom-node ())
(defstruct attribs list)
(defmethod print-object ((ob attribs) stream)
(format stream "~{~a=~s~^ ~}" (attribs-list ob)))
(defun dom-node-p (x) (typep x 'dom-node))
(defun node-list-p (es)
(and
(listp es)
(cl:loop :for e :in es :always (dom-node-p e))))
(deftype node-list ()
'(satisfies node-list-p))
(def:class elem (dom-node)
(tag :type keyword
:initform (error 'tag-required)
:documentation "HTML tag.")
(id :prefix
:ro :noarg
:type string
:initform (make-uid)
:documentation "A unique id, because id attribute.")
(style attributes
:prefix
:initform nil)
(children :type node-list)
:documentation "The base class for all UI elements.")
(defmethod print-object ((object elem) stream)
(indent stream)
(write-string "<" stream)
(with-slots (tag attributes style) object
(let ((elem-tag
(format nil "~a:~a" (class-name (class-of object)) tag)))
(write-string elem-tag stream)
(when attributes
(format stream " ~a" attributes))
(when style
(when attributes
(terpri stream)
(indent stream)
(indent stream (1+ (length elem-tag))))
(format stream " ~a" style)))
(write-string ">" stream)
(terpri stream))
(let ((*indent* (+ 2 *indent*)))
(cl:loop :for elem :in (children object) :do (print-object elem stream))))
(defun elemp (x) (typep x 'elem))
(def:class text (dom-node)
(content :prefix :type string :initform ""))
(defmethod print-object ((ob text) stream)
(indent stream)
(format stream "[text]~s~%" (text-content ob)))
(def:class vertical (elem)
:default-initargs (:tag :div))
(def:class horizontal (elem)
:default-initargs (:tag :div))
;;; MODIFYING
(defun $ (&rest plist)
(check-type plist keyword-plist)
(make-styles :list plist))
(defun $= (elem &rest plist)
(check-type plist keyword-plist)
(a:if-let (style (elem-style elem))
(cl:loop
:for (prop val) :on plist :by #'cddr
:do (setf (getf (styles-list style) prop) val))
(setf (elem-style elem)
(make-styles :list plist)))
elem)
(defun @ (&rest plist)
(check-type plist keyword-plist)
(make-attribs :list (cl:loop
:for (k v) :on plist :by #'cddr
:when v
:collect k :and :collect v)))
(defun @= (elem &rest plist)
(check-type plist keyword-plist)
(a:if-let (attribs (elem-attributes elem))
(cl:loop
:for (prop val) :on plist :by #'cddr
:when val
:do (setf (getf (attribs-list attribs) prop) val))
(setf (elem-attributes elem)
(make-attribs :list plist)))
elem)
;;; RENDERING
(defgeneric html (elem stream)
(:documentation "Renders an element as HTML"))
(defmethod html ((elem elem) stream)
(let ((*standard-output* stream)
(*print-case* :downcase))
(indent stream)
(with-slots (attributes style tag children id) elem
(format t "<~a" tag)
(when (and attributes (attribs-list attributes))
(format t " ~{~a=~s~^ ~}"
(attribs-list attributes)))
(when (and style (styles-list style))
(when attributes (write-char #\space))
(write-string "style=")
(write-char #\")
(format t "~{~a:~a;~}" (styles-list style))
(write-char #\"))
(write-char #\>)
(unless (self-closing-elem-p elem)
(let ((*indent* (+ 2 *indent*)))
(dolist (child children)
(terpri)
(html child stream)))
(terpri)
(indent stream)
(format t "</~a>" tag)))))
(defmethod html ((text text) stream)
(indent stream)
(write-string (text-content text) stream))
;;; ELEM BUILDERS
(defun ensure-node (thing)
(etypecase thing
(dom-node thing)
(string (make-instance 'text :content thing))))
(defun filter-nodes (contents)
(cl:loop
:for c :in contents
:when (or (stringp c) (dom-node-p c))
:collect (ensure-node c)))
(defun parse-contents (contents)
(values (find-if #'styles-p contents)
(find-if #'attribs-p contents)
(filter-nodes contents)))
(macrolet ((defelems (&body tags)
(let ((children (gensym "children"))
(styles (gensym "styles"))
(attribs (gensym "attribs"))
(tags (remove-duplicates tags)))
`(progn
,@(cl:loop
:for tag :in tags
:for fname := (a:symbolicate #\< tag #\>)
:collect `(defun ,fname (&rest contents)
(multiple-value-bind
(,styles ,attribs ,children)
(parse-contents contents)
(make-instance 'elem
:tag ,(a:make-keyword tag)
:style ,styles
:attributes ,attribs
:children ,children))))))))
(defelems
a
abbr
address
area
article
aside
audio
b
base
bdi
bdo
blockquote
body
br
button
canvas
caption
cite
code
col
colgroup
data
datalist
dd
del
details
dfn
dialog
div
dl
dt
em
embed
fieldset
figcaption
figuregure
footer
form
h1 h2 h3 h4 h5 h6
head
header
hgroup
hr
html
i
iframe
img
input
ins
kbd
label
legend
label
legend
li
link
main
map
mark
menu
meta
meter
nav
noscript
object
ol
optgroup
option
output
p
param
pre
progress
q
rp
rt
ruby
s
samp
script
section
script
section
select
small
source
span
strong
style
sub
summary
sup
table
tbody
td
textarea
tfoot
th
thead
time
title
tr
track
ul
var
video
wbr))
;;; CONVENIENCE ELEMENT BUILDERS
(defun <checkbox> (&key checked name)
(<input> (@ :type "checkbox" :name name :checked (when checked "true"))))
(defun <color> (&key name)
(<input> (@ :type "color" :name name)))
(defun <date> (&key name)
(<input> (@ :type "date" :name name)))
(defun <email> (&key name)
(<input> (@ :type "email" :name name)))
(defun <file> (&key name accept)
(<input> (@ :type "file" :name name :accept accept)))
(defun <hidden> (&key name value)
(<input> (@ :type "hidden" :name name :value value)))
(defun <number> (&key name value)
(<input> (@ :type "number" :name name :value value)))
(defun <password> (&key (placeholder "Password") (name "password"))
(<input> (@ :type "password" :name name :placeholder placeholder)))
(defun <radio> (name value &key checked)
(<input> (@ :type "radio" :name name :value value :checked (when checked "true"))))
(defun <range> (min max &key name value)
(<input> (@ :type "range" :name name :min min :max max :value value)))
(defun <reset> ()
(<input> (@ :type "reset")))
(defun <search> (&key placeholder name)
(<input> (@ :type "search" :placeholder placeholder :name name)))
(defun <timeinput> (&key name)
(<input> (@ :type "time" :name name)))
(defun <submit> (&rest contents)
(apply #'<button> (@ :type "submit") contents))
;;; LAYOUT ELEM BUILDERS
(macrolet ((deflayouts (&body specs)
(let ((children (gensym "children"))
(styles (gensym "styles"))
(attribs (gensym "attribs")))
`(progn
,@(cl:loop
:for (name class tag) :in specs
:for fname := (a:symbolicate #\< name #\>)
:collect `(defun ,fname (&rest contents)
(multiple-value-bind
(,styles ,attribs ,children)
(parse-contents contents)
(make-instance ',class
:tag ,(a:make-keyword tag)
:style ,styles
:attributes ,attribs
:children ,children))))))))
(deflayouts
(horiz horizontal div)
(vert vertical div)))
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