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(defpackage #:lazybones/client.parenscript
(:use #:cl)
(:local-nicknames (#:lzb #:lazybones)
(#:a #:alexandria))
(:export #:generate
#:generate-js))
(in-package :lazybones/client.parenscript)
(defun lispify (str)
#+testiere
(:tests
(equalp (lispify "a.b") "a-b")
(equalp (lispify "a/b") "a-b"))
(with-output-to-string (out)
(loop :for c :across str :do
(write-char
(if (find c "./") #\- c)
out))))
(defun client-function-name (method pattern)
"Return a symbol; the name of the parenscript function that will make
an HTTP request of type METHOD at the path implied by PATTERN. PATTERN
is the value of the endpoint's DISPATCH-PATTERN slot."
#+testiere
(:tests
(string-equal
(client-function-name
:get '("" "session" ("doesn't" :matter) "notifications"))
'get-session-notifications)
(string-equal
(client-function-name
:post '("" "foo.bar" "moo"))
'post-foo-bar-moo))
(intern
(lispify
(string-upcase
(format nil "~a-~{~a~^-~}"
method
(remove-if-not (a:conjoin #'stringp (complement #'a:emptyp))
pattern))))))
(defun client-function-lambda-list (variables &optional body-vars)
#+testiere
(:tests
(equalp
(client-function-lambda-list '("*SESSION*"))
'(*session*))
(equalp
(client-function-lambda-list '("a.x" "b/y" "c") '(q r))
'(a-x b-y c &key q r))
(equalp
(client-function-lambda-list '("pl" "foo") '(title url))
'(pl foo &key title url)))
(nconc (mapcar (a:compose #'intern #'string-upcase #'lispify) variables)
(when body-vars (cons '&key body-vars))))
(defun client-function-endpoint-path (prefix pattern)
#+testiere
(:tests
(equalp
(client-function-endpoint-path
"/api" '("" "session" ("id" :blahblah) "notifications"))
'(+ "/api" "/" "session" "/" id "/" "notifications")))
(list* '+ prefix
(loop :for x :in pattern
:unless (zerop (length x))
:collect "/"
:and :collect (if (consp x)
(intern (string-upcase (first x)))
x))))
(defun method-accepts-body? (m)
(member m '(:post :put :patch)))
(defun generate-endpoint-form (app ep)
(let* ((method
(lzb:endpoint-method ep))
(method-name
(symbol-name method))
(content-type
(or (lzb:endpoint-content-type ep)
(lzb::default-content-type app)))
(pattern
(lzb:endpoint-dispatch-pattern ep))
(variables
(lzb:endpoint-route-variables ep))
(function-name
(client-function-name method pattern))
(body-vars
(lzb:endpoint-body-variables ep))
(lambda-list
(client-function-lambda-list variables body-vars))
(body-serializtion-code
(when body-vars
(cond ((equal "application/json" content-type)
`(ps:chain
-j-s-o-n
(stringify (ps:create
,@(loop :for var :in body-vars
:collect var
:collect var)))))
((equal "multipart/form-data" content-type)
(let ((fd (gensym "FORMDATA")))
`((lambda ()
(let ((,fd (new -form-data)))
,@(loop :for v :in body-vars
:for s := (string-downcase (symbol-name v))
:collect `(ps:chain ,fd (append ,s ,v)))
,fd)))))
(t (error "Cannot automatically encode bodies for ~s"
content-type)))))
(fetch-path
(client-function-endpoint-path (lzb::app-prefix app) pattern)))
`(defun ,function-name ,lambda-list
,(if body-vars
`(fetch ,fetch-path
(ps:create
method ,method-name
headers (ps:create "Content-Type" ,content-type)
redirect "follow"
body ,body-serializtion-code))
`(fetch ,fetch-path)))))
(defun generate (app)
(let* ((module
(gensym "MODULE"))
(module-name
(intern (lispify (concatenate 'string "-" (symbol-name (lzb::app-name app))))))
(defuns
(loop :for ep :in (lzb:app-endpoints app)
:collect (generate-endpoint-form app ep)))
(exports
(loop :for defun :in defuns
:for name := (second defun)
:collect `(ps:@ ,module ,name)
:collect name)))
`(defvar ,module-name
((lambda (,module)
,@defuns
(setf ,@exports)
,module)
(ps:create)))))
(defun generate-js (app)
(eval `(ps:ps ,(generate app))))
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