1 files changed, 86 insertions, 0 deletions
diff --git a/py/objexcept.c b/py/objexcept.c
new file mode 100644
index 0000000000..4abc624376
--- /dev/null
+++ b/py/objexcept.c
@@ -0,0 +1,86 @@
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <assert.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "obj.h"
+
+typedef struct mp_obj_exception_t {
+    mp_obj_base_t base;
+    qstr id;
+    int n_args;
+    const void *args[];
+} mp_obj_exception_t;
+
+void exception_print(void (*print)(void *env, const char *fmt, ...), void *env, mp_obj_t o_in) {
+    mp_obj_exception_t *o = o_in;
+    switch (o->n_args) {
+        case 0:
+            print(env, "%s", qstr_str(o->id));
+            break;
+        case 1:
+            print(env, "%s: %s", qstr_str(o->id), (const char*)o->args[0]);
+            break;
+        case 2:
+            print(env, "%s: ", qstr_str(o->id));
+            print(env, (const char*)o->args[0], o->args[1]);
+            break;
+        default: // here we just assume at least 3 args, but only use first 3
+            print(env, "%s: ", qstr_str(o->id));
+            print(env, (const char*)o->args[0], o->args[1], o->args[2]);
+            break;
+    }
+}
+
+const mp_obj_type_t exception_type = {
+    { &mp_const_type },
+    "exception",
+    exception_print, // print
+    NULL, // call_n
+    NULL, // unary_op
+    NULL, // binary_op
+    NULL, // getiter
+    NULL, // iternext
+    {{NULL, NULL},}, // method list
+};
+
+mp_obj_t mp_obj_new_exception(qstr id) {
+    mp_obj_exception_t *o = m_new_obj(mp_obj_exception_t);
+    o->base.type = &exception_type;
+    o->id = id;
+    o->n_args = 0;
+    return o;
+}
+
+mp_obj_t mp_obj_new_exception_msg(qstr id, const char *msg) {
+    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, void*, 1);
+    o->base.type = &exception_type;
+    o->id = id;
+    o->n_args = 1;
+    o->args[0] = msg;
+    return o;
+}
+
+mp_obj_t mp_obj_new_exception_msg_1_arg(qstr id, const char *fmt, const char *a1) {
+    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, void*, 2);
+    o->base.type = &exception_type;
+    o->id = id;
+    o->n_args = 2;
+    o->args[0] = fmt;
+    o->args[1] = a1;
+    return o;
+}
+
+mp_obj_t mp_obj_new_exception_msg_2_args(qstr id, const char *fmt, const char *a1, const char *a2) {
+    mp_obj_exception_t *o = m_new_obj_var(mp_obj_exception_t, void*, 3);
+    o->base.type = &exception_type;
+    o->id = id;
+    o->n_args = 3;
+    o->args[0] = fmt;
+    o->args[1] = a1;
+    o->args[2] = a2;
+    return o;
+}