Support for printing object keys in sorted order.

No command-line option to enable this yet. See #79.

jv.h

@@ -117,7 +117,7 @@ jv jv_object_iter_value(jv, int);
 
 int jv_get_refcnt(jv);
 
-enum { JV_PRINT_PRETTY = 1, JV_PRINT_ASCII = 2, JV_PRINT_COLOUR = 4 };
+enum { JV_PRINT_PRETTY = 1, JV_PRINT_ASCII = 2, JV_PRINT_COLOUR = 4, JV_PRINT_SORTED = 8 };
 void jv_dump(jv, int flags);
 jv jv_dump_string(jv, int flags);
 

jv_print.c

@@ -5,6 +5,7 @@
 
 #include "jv_dtoa.h"
 #include "jv_unicode.h"
+#include "jv_aux.h"
 
 #define ESC "\033"
 #define COL(c) (ESC "[" c "m")
@@ -194,7 +195,34 @@ static void jv_dump_term(struct dtoa_context* C, jv x, int flags, int indent, FI
       put_space(indent+INDENT, F, S);
     }
     int first = 1;
-    jv_object_foreach(x, key, value) {
+    int i;
+    jv keyset = jv_null();
+    while (1) {
+      jv key, value;
+      if (flags & JV_PRINT_SORTED) {
+        if (first) {
+          keyset = jv_keys(jv_copy(x));
+          i = 0;
+        } else {
+          i++;
+        }
+        if (i >= jv_array_length(jv_copy(keyset))) {
+          jv_free(keyset);
+          break;
+        }
+        key = jv_array_get(jv_copy(keyset), i);
+        value = jv_object_get(jv_copy(x), jv_copy(key));
+      } else {
+        if (first) {
+          i = jv_object_iter(x);
+        } else {
+          i = jv_object_iter_next(x, i);
+        }
+        if (!jv_object_iter_valid(x, i)) break;
+        key = jv_object_iter_key(x, i);
+        value = jv_object_iter_value(x, i);
+      }
+
       if (!first) {
         if (flags & JV_PRINT_PRETTY){
           put_str(",\n", F, S);