1 files changed, 84 insertions, 0 deletions
diff --git a/py/builtinimport.c b/py/builtinimport.c
new file mode 100644
index 0000000000..f1479ab123
--- /dev/null
+++ b/py/builtinimport.c
@@ -0,0 +1,84 @@
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdarg.h>
+#include <string.h>
+#include <assert.h>
+
+#include "nlr.h"
+#include "misc.h"
+#include "mpconfig.h"
+#include "lexer.h"
+#include "lexerunix.h"
+#include "parse.h"
+#include "compile.h"
+#include "obj.h"
+#include "runtime0.h"
+#include "runtime.h"
+#include "map.h"
+#include "builtin.h"
+
+mp_obj_t mp_builtin___import__(int n, mp_obj_t *args) {
+    /*
+    printf("import:\n");
+    for (int i = 0; i < n; i++) {
+        printf("  ");
+        mp_obj_print(args[i]);
+        printf("\n");
+    }
+    */
+
+    // find the file to import
+    qstr mod_name = mp_obj_get_qstr(args[0]);
+    mp_lexer_t *lex = mp_import_open_file(mod_name);
+    if (lex == NULL) {
+        // TODO handle lexer error correctly
+        return mp_const_none;
+    }
+
+    // create a new module object
+    mp_obj_t module_obj = mp_obj_new_module(mp_obj_get_qstr(args[0]));
+
+    // save the old context
+    mp_map_t *old_locals = rt_locals_get();
+    mp_map_t *old_globals = rt_globals_get();
+
+    // set the new context
+    rt_locals_set(mp_obj_module_get_globals(module_obj));
+    rt_globals_set(mp_obj_module_get_globals(module_obj));
+
+    // parse the imported script
+    mp_parse_node_t pn = mp_parse(lex, MP_PARSE_FILE_INPUT);
+    mp_lexer_free(lex);
+
+    if (pn == MP_PARSE_NODE_NULL) {
+        // TODO handle parse error correctly
+        rt_locals_set(old_locals);
+        rt_globals_set(old_globals);
+        return mp_const_none;
+    }
+
+    if (!mp_compile(pn, false)) {
+        // TODO handle compile error correctly
+        rt_locals_set(old_locals);
+        rt_globals_set(old_globals);
+        return mp_const_none;
+    }
+
+    // complied successfully, execute it
+    mp_obj_t module_fun = rt_make_function_from_id(1); // TODO we should return from mp_compile the unique_code_id for the module
+    nlr_buf_t nlr;
+    if (nlr_push(&nlr) == 0) {
+        rt_call_function_0(module_fun);
+        nlr_pop();
+    } else {
+        // exception; restore context and re-raise same exception
+        rt_locals_set(old_locals);
+        rt_globals_set(old_globals);
+        nlr_jump(nlr.ret_val);
+    }
+    rt_locals_set(old_locals);
+    rt_globals_set(old_globals);
+
+    return module_obj;
+}