extmod/modujson: Add support for dump/dumps separators keyword-argument.

Optionally enabled via MICROPY_PY_UJSON_SEPARATORS.  Enabled by default.

For dump, make sure mp_get_stream_raise is called after
mod_ujson_separators since CPython does it in this order (if both
separators and stream are invalid, separators will raise an exception
first).

Add separators argument in the docs as well.

Signed-off-by: Peter Züger <zueger.peter@icloud.com>
Signed-off-by: Damien George <damien@micropython.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/py/mpprint.h b/py/mpprint.h
index aef9015de..0dff9a770 100644
--- a/py/mpprint.h
+++ b/py/mpprint.h
@@ -52,6 +52,14 @@ typedef struct _mp_print_t {
     mp_print_strn_t print_strn;
 } mp_print_t;
 
+typedef struct _mp_print_ext_t {
+    mp_print_t base;
+    const char *item_separator;
+    const char *key_separator;
+}mp_print_ext_t;
+
+#define MP_PRINT_GET_EXT(print) ((mp_print_ext_t *)print)
+
 // All (non-debug) prints go through one of the two interfaces below.
 // 1) Wrapper for platform print function, which wraps MP_PLAT_PRINT_STRN.
 extern const mp_print_t mp_plat_print;