From 3600a2c69e6f03e2db23900f7bc7caf088460836 Mon Sep 17 00:00:00 2001
From: Robby Zambito <contact@robbyzambito.me>
Date: Fri, 17 Feb 2023 00:27:42 -0500
Subject: Finish basic json-record functionality.

Can serialize and deserialize nested records correctly.

Add json-object-map and json-list-map to facilitate recursively demoting records.

Add json-object-set! to make the record mutators functional.
---
 lib/zambyte/meta/chibi.scm | 37 +++++++++++++++++++++++++++++++------
 1 file changed, 31 insertions(+), 6 deletions(-)

(limited to 'lib/zambyte/meta/chibi.scm')

diff --git a/lib/zambyte/meta/chibi.scm b/lib/zambyte/meta/chibi.scm
index 7cc777d..ba5a919 100644
--- a/lib/zambyte/meta/chibi.scm
+++ b/lib/zambyte/meta/chibi.scm
@@ -1,5 +1,7 @@
 (import (rename (chibi json) (json->string base:json->string))
-	(srfi 1))
+	(scheme case-lambda)
+	(srfi 1)
+	(srfi 2))
 (begin
   (define json-object list)
   (define json-list vector)
@@ -21,11 +23,9 @@
   (define (json-null? obj)
     (eq? obj json-null))
 
-  ;; json->string already defined in chibi json
   (define (json->string json)
-    (if (json-record? json)
-	(json->string (json-record->fields json))
-	(base:json->string json)))
+    (base:json->string (json->typeless-json json)))
+
   ;; string->json already defined in chibi json
 
   (define (json-object-ref json key)
@@ -37,11 +37,36 @@
 	    ((json-key-not-found)))))
      ((json-record? json)
       (json-object-ref (json-record->fields json) key))
-     (else (error "json-object-ref: not an object" json))))
+     (else ((json-key-not-found)))))
+
+  (define (json-object-set! json key value)
+    (cond
+     ((and (list? json)
+	   (json-object-contains-key? json key))
+      (set-cdr! (assoc key json) value))
+     ((null? json)
+      (error "json-object-set!: cannot set on an empty object" json))
+     ((list? json)
+      (append! json (list (cons key value))))
+     ((json-record? json)
+      (or (and-let* ((pair (assoc key (json-record->mutators json)))
+		     (mutator (cdr pair)))
+	    (mutator json value))
+	  (error "json-object-set!: no mutator for field" (json-record->name json) key)))))
 
   (define json-list-ref vector-ref)
   (define json-list-length vector-length)
 
+  (define (json-object-map proc json)
+    (map (lambda (pair)
+	   (call-with-values (lambda () (proc (car pair) (cdr pair)))
+	     (case-lambda
+	       ((key value) (cons key value))
+	       (_ (error "json-object-map: wrong return wrong number of values")))))
+	 json))
+
+  (define json-list-map vector-map)
+
   (define (json-object->alist json)
     (cond
      ((list? json) json)
-- 
cgit