support slice utf8 for str

add test for slice utf-8

package/PikaStdLib/PikaStdData_String.c

@@ -78,6 +78,9 @@ Arg *PikaStdData_String___next__(PikaObj *self)
 Arg *PikaStdData_String___getitem__(PikaObj *self, Arg *__key)
 {
     int key_i = arg_getInt(__key);
+    if (key_i < 0){
+        key_i = PikaStdData_String___len__(self) + key_i;
+    }
     char *str = obj_getStr(self, "str");
     uint16_t len = strGetSize(str);
 #if PIKA_STRING_UTF8_ENABLE

port/linux/.vscode/launch.json

@@ -11,7 +11,7 @@
             "program": "${workspaceFolder}/build/test/pikascript_test",
             // "program": "${workspaceFolder}/build/boot/demo06-pikamain/pikascript_demo06-pikamain",
             "args": [
-                // "--gtest_filter=vm.test64"
+                // "--gtest_filter=except.dict"
             ],
             "stopAtEntry": false,
             "cwd": "${workspaceFolder}",

port/linux/package/pikascript/pikascript-lib/PikaStdLib/PikaStdData_String.c

@@ -78,6 +78,9 @@ Arg *PikaStdData_String___next__(PikaObj *self)
 Arg *PikaStdData_String___getitem__(PikaObj *self, Arg *__key)
 {
     int key_i = arg_getInt(__key);
+    if (key_i < 0){
+        key_i = PikaStdData_String___len__(self) + key_i;
+    }
     char *str = obj_getStr(self, "str");
     uint16_t len = strGetSize(str);
 #if PIKA_STRING_UTF8_ENABLE

port/linux/test/string-test.cpp

@@ -244,3 +244,29 @@ TEST(string, str_issue1) {
     EXPECT_EQ(pikaMemNow(), 0);
 }
 #endif
+
+#if PIKA_STRING_UTF8_ENABLE
+TEST(string, utf8_1) {
+    /* init */
+    pikaMemInfo.heapUsedMax = 0;
+    PikaObj* pikaMain = newRootObj("pikaMain", New_PikaMain);
+    /* run */
+    __platform_printf("BEGIN\r\n");
+    obj_run(pikaMain,
+            "s = '你好，Hello, Halo, Hi.'\n"
+            "s1 = s[0:9]\n"
+            "s2 = s[0:2]\n"
+            "s1\n"
+            "s2\n");
+    /* collect */
+    char* s1 = obj_getStr(pikaMain, "s1");
+    char* s2 = obj_getStr(pikaMain, "s2");
+    /* assert */
+    EXPECT_STREQ(s1, "你好，Hello,");
+    EXPECT_STREQ(s2, "你好");
+    /* deinit */
+    obj_deinit(pikaMain);
+
+    EXPECT_EQ(pikaMemNow(), 0);
+}
+#endif

src/PikaObj.h

@@ -307,7 +307,7 @@ void* obj_getStruct(PikaObj* self, char* name);
     while (1)
 
 char* obj_cacheStr(PikaObj* self, char* str);
-PikaObj* _arg_to_obj(Arg* self, PIKA_BOOL* is_convert);
+PikaObj* _arg_to_obj(Arg* self, PIKA_BOOL* pIsTemp);
 char* __printBytes(PikaObj* self, Arg* arg);
 
 #define PIKASCRIPT_VERSION_TO_NUM(majer, minor, micro) \

src/PikaVM.c

@@ -278,12 +278,18 @@ static Arg* VM_instruction_handler_NON(PikaObj* self,
 }
 
 Arg* __vm_get(PikaObj* self, Arg* key, Arg* obj) {
-    ArgType obj_type = arg_getType(obj);
+    ArgType type = arg_getType(obj);
+    Arg* obj_new = NULL;
     int index = 0;
     if (ARG_TYPE_INT == arg_getType(key)) {
         index = arg_getInt(key);
     }
-    if (ARG_TYPE_STRING == obj_type) {
+    if (ARG_TYPE_STRING == type) {
+#if PIKA_STRING_UTF8_ENABLE
+        PIKA_BOOL is_temp = 0;
+        obj_new = arg_newObj(_arg_to_obj(obj, &is_temp));
+        type = arg_getType(obj_new);
+#else
         char* str_pyload = arg_getStr(obj);
         char char_buff[] = " ";
         if (index < 0) {
@@ -291,8 +297,9 @@ Arg* __vm_get(PikaObj* self, Arg* key, Arg* obj) {
         }
         char_buff[0] = str_pyload[index];
         return arg_newStr(char_buff);
+#endif
     }
-    if (ARG_TYPE_BYTES == obj_type) {
+    if (ARG_TYPE_BYTES == type) {
         uint8_t* bytes_pyload = arg_getBytes(obj);
         uint8_t byte_buff[] = " ";
         if (index < 0) {
@@ -301,8 +308,13 @@ Arg* __vm_get(PikaObj* self, Arg* key, Arg* obj) {
         byte_buff[0] = bytes_pyload[index];
         return arg_newBytes(byte_buff, 1);
     }
-    if (argType_isObject(obj_type)) {
-        PikaObj* arg_obj = arg_getPtr(obj);
+    if (argType_isObject(type)) {
+        PikaObj* arg_obj = NULL;
+        if (obj_new != NULL) {
+            arg_obj = arg_getPtr(obj_new);
+        } else {
+            arg_obj = arg_getPtr(obj);
+        }
         obj_setArg(arg_obj, "__key", key);
         /* clang-format off */
         PIKA_PYTHON(
@@ -322,9 +334,17 @@ Arg* __vm_get(PikaObj* self, Arg* key, Arg* obj) {
         };
         pikaVM_runByteCode(arg_obj, (uint8_t*)bytes);
         Arg* __res = args_getArg(arg_obj->list, "__res");
+        Arg* res = NULL;
         if (NULL != __res) {
-            return arg_copy(__res);
+            res = arg_copy(__res);
         }
+        if (NULL != obj_new) {
+            arg_deinit(obj_new);
+        }
+        if (NULL == res) {
+            return arg_newNull();
+        }
+        return res;
     }
     return arg_newNull();
 }