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marshal.el
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marshal.el
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;;; marshal.el --- eieio extension for automatic (un)marshalling
;; Copyright (C) 2015-2020 Yann Hodique
;; Author: Yann Hodique <yann.hodique@gmail.com>
;; Keywords: extensions
;; Version: 0.9.1
;; URL: https://github.com/sigma/marshal.el
;; Package-Requires: ((emacs "25.1") (ht "2.0"))
;; This file is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; This file is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.
;;; Commentary:
;; Inspired by Go tagged structs. 'alist, 'plist and 'json drivers are
;; provided, but implementing others just requires to inherit from
;; `marshal-driver'.
;; Sometimes the types are not enough (for example with lists, whose elements
;; are not explicitly typed. In those cases, a small extension on top of types
;; can be used. Like for example :marshal-type (list string)
;; Examples:
;; 1. Regular use:
;; (marshal-defclass plop ()
;; ((foo :initarg :foo :type string :marshal ((alist . field_foo)))
;; (bar :initarg :bar :type integer :marshal ((alist . field_bar)))
;; (baz :initarg :baz :type integer :marshal ((alist . field_baz)))))
;; (marshal-defclass plopi ()
;; ((alpha :marshal ((alist . field_alpha)))
;; (beta :type plop :marshal ((alist . field_beta)))))
;; (marshal (make-instance 'plop :foo "ok" :bar 42) 'alist)
;; => '((field_bar . 42) (field_foo . "ok"))
;; (unmarshal 'plop '((field_foo . "plop") (field_bar . 0) (field_baz . 1)) 'alist)
;; => '[object plop "plop" "plop" 0 1]
;; (marshal
;; (unmarshal 'plopi '((field_alpha . 42)
;; (field_beta . ((field_foo . "plop")
;; (field_bar . 0)
;; (field_baz . 1)))) 'alist)
;; 'alist)
;; => '((field_beta (field_baz . 1) (field_bar . 0) (field_foo . "plop")) (field_alpha . 42))
;; 2. Objects involving lists:
;; (marshal-defclass foo/tree ()
;; ((root :initarg :id :marshal ((plist . :root) json))
;; (leaves :initarg :leaves :marshal ((plist . :leaves) json) :marshal-type (list foo/tree))))
;; (marshal (make-instance 'foo/tree :id 0
;; :leaves (list (make-instance 'foo/tree :id 1)
;; (make-instance 'foo/tree :id 2
;; :leaves (list (make-instance 'foo/tree :id 3)))))
;; 'plist)
;; => (:root 0 :leaves ((:root 1) (:root 2 :leaves ((:root 3)))))
;; (unmarshal 'foo/tree '(:root 0 :leaves ((:root 1) (:root 2 :leaves ((:root 3))))) 'plist)
;; => [object foo/tree "foo/tree" 0
;; ([object foo/tree "foo/tree" 1 nil]
;; [object foo/tree "foo/tree" 2
;; ([object foo/tree "foo/tree" 3 nil])])]
;; 3. Json
;; (marshal (make-instance 'foo/tree :id 0
;; :leaves (list (make-instance 'foo/tree :id 1)
;; (make-instance 'foo/tree :id 2
;; :leaves (list (make-instance 'foo/tree :id 3)))))
;; 'json)
;; => "{\"leaves\":[{\"root\":1},{\"leaves\":[{\"root\":3}],\"root\":2}],\"root\":0}"
;; (unmarshal 'foo/tree "{\"leaves\":[{\"root\":1},{\"leaves\":[{\"root\":3}],\"root\":2}],\"root\":0}" 'json)
;; => [object foo/tree "foo/tree" 0
;; ([object foo/tree "foo/tree" 1 nil]
;; [object foo/tree "foo/tree" 2
;; ([object foo/tree "foo/tree" 3 nil])])]
;;; Code:
(require 'eieio)
(eval-and-compile
;;; load json library lazily
(dolist (sym '(json-encode json-read-from-string))
(autoload sym "json"))
;;; load ht library lazily
(dolist (sym '(ht-empty? ht-items ht<-alist))
(autoload sym "ht")))
;;; Defined drivers
(defvar marshal-drivers nil "Alist of drivers")
(defun marshal-register-driver (type driver)
(add-to-list 'marshal-drivers (cons type driver)))
;;; Marshalling driver interface
(defclass marshal-driver ()
((input :initarg :input)
(output :initarg :output)))
(cl-defmethod marshal-open ((obj marshal-driver) &optional input)
(if input
(oset obj :input input)
(oset obj :output nil)))
(cl-defmethod marshal-write ((obj marshal-driver) path value)
(unless (slot-boundp obj :output)
(error "Driver has not been opened in write mode")))
(cl-defmethod marshal-read ((obj marshal-driver) path)
(unless (slot-boundp obj :input)
(error "Driver has not been opened in read mode")))
(cl-defmethod marshal-close ((obj marshal-driver))
(when (slot-boundp obj :output)
(oref obj output)))
(cl-defmethod marshal-guess-type ((cls (subclass marshal-driver)) blob)
(cond ((null blob) nil)
((booleanp blob) 'bool)
((stringp blob) 'string)
((numberp blob) 'number)
((listp blob) 'list)
((hash-table-p blob) 'hash)))
(cl-defmethod marshal-preprocess ((obj marshal-driver) blob)
blob)
(cl-defmethod marshal-postprocess ((obj marshal-driver) blob)
blob)
(cl-defmethod marshal-unmarshal-null ((cls (subclass marshal-driver)))
nil)
(cl-defmethod marshal-marshal-null ((cls (subclass marshal-driver)))
nil)
(cl-defmethod marshal-unmarshal-string ((cls (subclass marshal-driver)) s)
(format "%s" s))
(cl-defmethod marshal-marshal-string ((cls (subclass marshal-driver)) s)
s)
(cl-defmethod marshal-unmarshal-number ((cls (subclass marshal-driver)) i)
i)
(cl-defmethod marshal-marshal-number ((cls (subclass marshal-driver)) i)
i)
(cl-defmethod marshal-unmarshal-bool ((cls (subclass marshal-driver)) b)
(equal b t))
(cl-defmethod marshal-marshal-bool ((cls (subclass marshal-driver)) b)
(equal b t))
(cl-defmethod marshal-unmarshal-list ((cls (subclass marshal-driver)) l l-type)
(cons (unmarshal-internal (when (consp l-type)
(cadr l-type))
(car l) cls)
(unmarshal-internal l-type (cdr l) cls)))
(cl-defmethod marshal-marshal-list ((cls (subclass marshal-driver)) l)
(unless (null l)
(cons (marshal-internal (car l) cls)
(marshal-internal (cdr l) cls))))
(cl-defmethod marshal-unmarshal-hash ((cls (subclass marshal-driver)) h h-type)
(let ((k-type (when (consp h-type) (nth 1 h-type)))
(v-type (when (consp h-type) (nth 2 h-type))))
(ht<-alist
(mapcar (lambda (item)
(cons (unmarshal-internal k-type (car item) cls)
(unmarshal-internal v-type (cdr item) cls))) h))))
(cl-defmethod marshal-marshal-hash ((cls (subclass marshal-driver)) h)
(unless (ht-empty? h)
(mapcar (lambda (item)
(cons (marshal-internal (car item) cls)
(marshal-internal (cadr item) cls)))
(ht-items h))))
;;; alist-based driver
(defclass marshal-driver-alist (marshal-driver)
())
(cl-defmethod marshal-write ((obj marshal-driver-alist) path value)
(cl-call-next-method)
(object-add-to-list obj :output (cons path value)))
(cl-defmethod marshal-read ((obj marshal-driver-alist) path)
(cl-call-next-method)
(cdr (assoc path (oref obj input))))
;;; json driver
(defclass marshal-driver-json (marshal-driver-alist)
())
(cl-defmethod marshal-preprocess ((obj marshal-driver-json) blob)
(let ((json-array-type 'list)
(json-object-type 'alist)
(json-false :json-false))
(json-read-from-string (cl-call-next-method))))
(cl-defmethod marshal-postprocess ((obj marshal-driver-json) blob)
(json-encode (cl-call-next-method)))
(cl-defmethod marshal-unmarshal-bool ((cls (subclass marshal-driver-json)) b)
(not (eq b :json-false)))
(cl-defmethod marshal-marshal-bool ((cls (subclass marshal-driver-json)) b)
(or b :json-false))
;;; plist-based driver
(defclass marshal-driver-plist (marshal-driver)
())
(cl-defmethod marshal-write ((obj marshal-driver-plist) path value)
(cl-call-next-method)
(oset obj :output (plist-put (oref obj output) path value)))
(cl-defmethod marshal-read ((obj marshal-driver-plist) path)
(cl-call-next-method)
(plist-get (oref obj input) path))
;;; helper functions
(defun marshal--alist-add (alist key value &optional append)
(let ((existing (assoc key alist)))
(if (not existing)
(cons (cons key value) alist)
(setcdr existing (if append
(append (cdr existing) value)
value))
alist)))
(defun marshal--alist-merge (alist1 alist2 &optional append)
(let ((res alist1))
(if alist2
(let* ((pair (car alist2))
(x (car pair))
(y (cdr pair)))
(marshal--alist-merge
(marshal--alist-add alist1 x y append)
(cdr alist2)))
alist1)))
(defun marshal--transpose-alist2 (l)
(let (res
(rows l))
(while rows
(let* ((row (car rows))
(x (car row))
(cols (cdr row)))
(while cols
(let* ((col (car cols))
(y (car col))
(z (cdr col))
(target (or (assoc y res)
(let ((p (cons y nil)))
(setq res (push p res))
p))))
(setcdr target (cons (cons x z) (cdr target))))
(setq cols (cdr cols))))
(setq rows (cdr rows)))
res))
;;; base-class for serializable objects
(defclass marshal-base ()
((-marshal-info :allocation :class :initform nil :protection :protected)
(-type-info :allocation :class :initform nil :protection :protected)))
(cl-defmethod marshal-get-marshal-info ((cls (subclass marshal-base)))
(get cls :marshal-info))
(cl-defmethod marshal-get-type-info ((cls (subclass marshal-base)))
(get cls :type-info))
(cl-defmethod marshal-get-class-slot ((cls (subclass marshal-base)))
(get cls :marshal-class-slot))
(defun marshal-get-driver (type)
(let ((cls (or (and (class-p type) type)
(cdr (assoc type marshal-drivers))
'marshal-driver)))
(make-instance cls)))
(cl-defmethod marshal-internal ((obj marshal-base) type &optional hint)
(let* ((type (or (and (class-p type)
(car (rassoc type marshal-drivers)))
type))
(driver (marshal-get-driver type))
(marshal-info (cdr (assoc type (marshal-get-marshal-info (eieio-object-class obj))))))
(marshal-open driver)
(when marshal-info
(when (and hint (not (eq hint (eieio-object-class obj))))
(marshal-write driver (marshal-get-class-slot hint)
(eieio-object-class obj)))
(dolist (s (mapcar (lambda (x) (eieio-slot-descriptor-name x)) (eieio-class-slots (eieio-object-class obj))))
(let ((path (cdr (assoc s marshal-info))))
(when (and path
(slot-boundp obj s))
(marshal-write driver path
(marshal-internal
(eieio-oref obj s)
type
(cdr (assoc s (marshal-get-type-info (eieio-object-class obj))))))))))
(marshal-close driver)))
(cl-defmethod marshal-internal ((obj t) type &optional hint)
(let ((driver (eieio-object-class (marshal-get-driver type))))
(cond ((and (null hint) (null obj))
(marshal-marshal-null driver))
((or (eq obj t)
(and (null obj) (eq hint 'bool)))
(marshal-marshal-bool driver obj))
((stringp obj)
(marshal-marshal-string driver obj))
((numberp obj)
(marshal-marshal-number driver obj))
((listp obj)
(marshal-marshal-list driver obj))
((hash-table-p obj)
(marshal-marshal-hash driver obj)))))
;;;###autoload
(defun marshal (obj type)
(let ((driver (marshal-get-driver type)))
(marshal-postprocess driver
(marshal-internal obj type))))
(cl-defmethod unmarshal--obj ((obj marshal-base) blob type)
(let ((driver (marshal-get-driver type))
(marshal-info (cdr (assoc type (marshal-get-marshal-info (eieio-object-class obj))))))
(marshal-open driver blob)
(when (and marshal-info blob)
(dolist (s (mapcar (lambda (x) (eieio-slot-descriptor-name x)) (eieio-class-slots (eieio-object-class obj))))
(let ((path (cdr (assoc s marshal-info))))
(when path
(eieio-oset obj s
(unmarshal-internal
(cdr (assoc s (marshal-get-type-info (eieio-object-class obj))))
(marshal-read driver path)
type))))))
(marshal-close driver)
obj))
(defun unmarshal-internal (obj blob type)
(let ((obj (if (class-p obj)
(let ((driver (marshal-get-driver type)))
(let ((cls (or (and
(not (null blob))
(let ((driver (marshal-get-driver type)))
(prog2
(marshal-open driver blob)
(marshal-read
driver
(marshal-get-class-slot obj))
(marshal-close driver))))
obj)))
(make-instance cls)))
obj)))
(unmarshal--internal obj blob type)))
(cl-defmethod unmarshal--internal ((obj t) blob type)
(let* ((driver (eieio-object-class (marshal-get-driver type)))
(obj (or obj (marshal-guess-type driver blob))))
(cond ((or (null obj) (null blob))
(marshal-unmarshal-null driver))
((eq obj 'bool)
(marshal-unmarshal-bool driver blob))
((eq obj 'string)
(marshal-unmarshal-string driver blob))
((memq obj '(number integer))
(marshal-unmarshal-number driver blob))
((or (eq obj 'list)
(and (consp obj) (eq (car obj) 'list)))
(marshal-unmarshal-list driver blob obj))
((or (eq obj 'hash)
(and (consp obj) (eq (car obj) 'hash)))
(marshal-unmarshal-hash driver blob obj)))))
(cl-defmethod unmarshal--internal ((obj marshal-base) blob type)
(let ((type (or (and (class-p type)
(car (rassoc type marshal-drivers)))
type)))
(unmarshal--obj obj blob type)))
;;;###autoload
(defun unmarshal (obj blob type)
(let ((driver (marshal-get-driver type)))
(unmarshal-internal obj (marshal-preprocess driver blob) type)))
;;;###autoload
(defmacro marshal-defclass (name superclass slots &rest options-and-doc)
(declare (debug t) (indent 2))
(let* ((options (if (stringp (car options-and-doc))
(cdr options-and-doc)
options-and-doc))
(default-spec-func (or (plist-get options :marshal-default-spec)
'ignore))
(base-cls (or (plist-get options :marshal-base-cls)
'marshal-base))
(cls-slot (or (plist-get options :marshal-class-slot)
:-cls))
(marshal-info (marshal--transpose-alist2
(remove nil
(mapcar
(lambda (s)
(let ((name (car s)))
(let ((marshal
(or (plist-get (cdr s) :marshal)
(funcall default-spec-func name))))
(when marshal
(cons name
(mapcar
(lambda (p)
(if (consp p)
p
(cons p name)))
marshal))))))
slots))))
(type-info (remove nil
(mapcar (lambda (s)
(let ((name (car s)))
(let ((type (or (plist-get (cdr s) :marshal-type)
(plist-get (cdr s) :type))))
(when type
(cons name type)))))
slots))))
`(progn
(defclass ,name (,@superclass ,base-cls)
(,@slots)
,@options-and-doc)
(put ',name :marshal-class-slot ',cls-slot)
(put ',name :marshal-info ',marshal-info)
(dolist (cls ',superclass)
(put ',name :marshal-info
(marshal--alist-merge (get ',name :marshal-info)
(marshal-get-marshal-info cls) t)))
(put ',name :type-info ',type-info)
(dolist (cls ',superclass)
(put ',name :type-info
(marshal--alist-merge (get ',name :type-info)
(marshal-get-type-info cls) t)))
,name)))
;;; Default drivers
(marshal-register-driver 'alist 'marshal-driver-alist)
(marshal-register-driver 'plist 'marshal-driver-plist)
(marshal-register-driver 'json 'marshal-driver-json)
(provide 'marshal)
;;; marshal.el ends here