From 142166df54eda65925921799a4bb3e7f6cdaba48 Mon Sep 17 00:00:00 2001
From: ckonstanski <ckonstanski@pippiandcarlos.com>
Date: Tue, 6 Feb 2018 21:42:54 -0700
Subject: initial commit

---
 json/json-utils.lisp | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 json/json-utils.lisp

(limited to 'json/json-utils.lisp')

diff --git a/json/json-utils.lisp b/json/json-utils.lisp
new file mode 100644
index 0000000..7ebe3bf
--- /dev/null
+++ b/json/json-utils.lisp
@@ -0,0 +1,76 @@
+;;; -*- Mode: Lisp; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+(declaim (optimize (speed 0) (safety 3) (debug 3)))
+
+(in-package #:music-dispensary)
+
+;; ========================================================================== ;;
+
+(defun json-to-object (object-type json-obj)
+  (remove-if-not (lambda (x)
+                   (let ((found-value nil))
+                     (loop for slot in (map-slot-names x) do
+                          (when (slot-value x slot)
+                            (setf found-value t)))
+                     found-value))
+                 (mapcar (lambda (obj)
+                           (let ((object (make-instance object-type)))
+                             (loop for slot in (map-slot-names object) do
+                                  (let ((symb (intern (symbol-name slot) :keyword)))
+                                    (setf (slot-value object slot)
+                                          (cdr (find-if (lambda (param) (eq (car param) symb)) obj)))))
+                             object))
+                         json-obj)))
+
+;; ========================================================================== ;;
+
+(defun objects-to-json (list-of-objects &optional (explicit-encoder-p nil))
+  (labels ((objectp (object)
+             (not (eq () (remove-if 'null (mapcar (lambda (superclass)
+                                                    (eq (class-name superclass) 'base-service))
+                                                  (sb-mop:class-direct-superclasses (class-of object)))))))
+           (list-of-lists-p (object)
+             (and (listp object)
+                  (find-if (lambda (y) (not (null y)))
+                           (mapcar (lambda (x)
+                                     (listp x))
+                                   object))))
+           (list-of-objects-p (object)
+             (and (listp object)
+                  (find-if (lambda (y) (not (null y)))
+                           (mapcar (lambda (x)
+                                     (objectp x))
+                                   object))))
+           (map-slots (object)
+             (remove-if 'null (mapcar (lambda (slot)
+                                        (let ((symb (intern (symbol-name slot) :keyword))
+                                              (value (slot-value object slot)))
+                                          (when value
+                                            (cons symb (cond ((or (equal value (json:json-bool t))
+                                                                  (equal value (json:json-bool nil)))
+                                                              value)
+                                                             ((list-of-lists-p value)
+                                                              (listify value))
+                                                             ((list-of-objects-p value)
+                                                              (if explicit-encoder-p
+                                                                  (error "Can't do list-of-objects with the explicit encoder.")
+                                                                  (listify value)))
+                                                             ((listp value)
+                                                              (map 'vector #'identity value))
+                                                             ((objectp value)
+                                                              (if explicit-encoder-p
+                                                                  (cons :object (map-slots value))
+                                                                  (map-slots value)))
+                                                             (t
+                                                              value))))))
+                                      (map-slot-names object))))
+           (listify (list-of-objects)
+             (mapcar (lambda (object)
+                       (map-slots object))
+                     list-of-objects)))
+    (let ((listobj (listify list-of-objects)))
+      (reduce-to-comma-separated-string (mapcar (lambda (alist)
+                                                  (if explicit-encoder-p
+                                                      (json:with-explicit-encoder
+                                                        (json:encode-json-to-string (cons :object alist)))
+                                                      (json:encode-json-alist-to-string alist)))
+                                                listobj)))))
-- 
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