py: Add native json printing using existing print framework.

Also add start of ujson module with dumps implemented.  Enabled in unix
and stmhal ports.  Test passes on both.

1 files changed, 14 insertions, 5 deletions

diff --git a/py/objtuple.c b/py/objtuple.c
index 6abe7d2c6..2793e4838 100644
--- a/py/objtuple.c
+++ b/py/objtuple.c
@@ -43,17 +43,26 @@ STATIC mp_obj_t mp_obj_new_tuple_iterator(mp_obj_tuple_t *tuple, mp_uint_t cur);
 
 void mp_obj_tuple_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in, mp_print_kind_t kind) {
     mp_obj_tuple_t *o = o_in;
-    print(env, "(");
+    if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
+        print(env, "[");
+    } else {
+        print(env, "(");
+        kind = PRINT_REPR;
+    }
     for (mp_uint_t i = 0; i < o->len; i++) {
         if (i > 0) {
             print(env, ", ");
         }
-        mp_obj_print_helper(print, env, o->items[i], PRINT_REPR);
+        mp_obj_print_helper(print, env, o->items[i], kind);
     }
-    if (o->len == 1) {
-        print(env, ",");
+    if (MICROPY_PY_UJSON && kind == PRINT_JSON) {
+        print(env, "]");
+    } else {
+        if (o->len == 1) {
+            print(env, ",");
+        }
+        print(env, ")");
     }
-    print(env, ")");
 }
 
 STATIC mp_obj_t mp_obj_tuple_make_new(mp_obj_t type_in, mp_uint_t n_args, mp_uint_t n_kw, const mp_obj_t *args) {