89 lines
2.5 KiB
Scheme
89 lines
2.5 KiB
Scheme
(define-macro (mithril:init)
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"(mithril:init)
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Loads Mithril into the document head and sets the
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pragma->sxml function."
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`(begin (get-resource "https://cdnjs.cloudflare.com/ajax/libs/mithril/2.2.2/mithril.min.js")
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(pragma->sxml m)))
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(mithril:init)
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(define-macro (mithril:comp view . args)
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"(mithril:comp view . args)
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Creates a Mithril component object, where VIEW is
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a function body used to display the component, and
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ARGS is a list of keyword-value pairs that specify
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additional values on the component object.
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For example, the following code creates a stateful
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heading component:
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```
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(define Heading
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(component
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(sxml
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(h1 ~vnode.state.title))
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:title \"Title Text\"))
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```"
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(when (and (not (null? args))
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(= (remainder (length args) 2) 1))
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(error (format
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"mithril:comp-> Component macro expects even length args list.
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Call: (mithril:comp ~s ~s)"
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view args)))
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`(object
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:view
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(lambda (vnode) (,@view))
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,@args))
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(define (mithril:repl prompt)
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"(mithril:repl prompt preamble)
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Returns a REPL Mithril component that allows evaluating
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custom LIPS code. The environment used by this REPL is
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the same as the application execution environment, meaning
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that the DOM and running scripts can be modified.
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PROMPT specifies the user prompt."
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(let* ((add-line (lambda (state text prompt?)
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(map
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(lambda (l)
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(set! state.lines (cons `&(:text ,l :prompt ,prompt?) state.lines)))
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(string-split "\n" text))))
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(evaluate (lambda (state cmd)
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(add-line state (format "~a~a" prompt cmd) #t)
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(let ((res (eval (with-input-from-string cmd read))))
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(when res
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(add-line state res #f)))))
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(handle-key-down (lambda (state e)
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(cond
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((equal? e.key "Enter")
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(e.preventDefault)
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(let ((cmd state.input))
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(set! state.input "")
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(evaluate state cmd)))))))
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(mithril:comp
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(let ((state vnode.state))
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(sxml
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(div.repl
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(div.repl-output
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~(list->array
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(map
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(lambda (line)
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(m ".line" line.text))
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(reverse state.lines))))
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(div.repl-input
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(span.prompt ~prompt)
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(input (@ (type "text")
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(value state.input)
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(oninput (lambda (e) (set! state.input e.target.value)))
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(onkeydown (lambda (e) (handle-key-down state e)))
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(oncreate (lambda (vnode)
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(set! state.inputRef vnode.dome)
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(vnode.dom.focus)))
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(onfocus (lambda () (object)))
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(autofocus #t)))))))
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:oninit (lambda (vnode)
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(set! vnode.state.lines '())
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(set! vnode.state.input "")))))
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