Add json-object-contains-key?, json-list-length, and json-key-not-found.

Update README accordingly and with add examples.

1 files changed, 16 insertions, 8 deletions

diff --git a/lib/zambyte/meta/gauche.scm b/lib/zambyte/meta/gauche.scm
index 733599a..3ab2062 100644
--- a/lib/zambyte/meta/gauche.scm
+++ b/lib/zambyte/meta/gauche.scm
@@ -2,6 +2,18 @@
 	(rfc json)
 	(srfi 1))
 (begin
+  (define json-object list)
+  (define json-list vector)
+  (define json-null 'null)
+  (define json-object? list?)
+  (define json-list? vector?)
+
+  (define (json-null? obj)
+    (eq? obj json-null))
+
+  (define (json-object-contains-key? obj key)
+    (and (assoc key obj) #t))
+
   (define array-handler list->vector)
   (define object-handler identity)
   (define (special-handler x)
@@ -17,16 +29,12 @@
       (parse-json-string str)))
 
   (define json->string construct-json-string)
-  (define json-object list)
-  (define json-list vector)
-  (define json-null 'null)
-  (define json-object? list?)
-  (define json-list? vector?)
 
-  (define (json-null? obj)
-    (eq? obj json-null))
+  (define (json-object-ref json key)
+    (or (assoc-ref json key)
+	((json-key-not-found))))
 
-  (define json-object-ref assoc-ref)
   (define json-list-ref vector-ref)
+  (define json-list-length vector-length)
   (define json-object->alist identity)
   (define json-list->list vector->list))