Add localStorage.clear in JSB

cocos/scripting/js-bindings/manual/localstorage/js_bindings_system_functions.cpp

@@ -69,5 +69,15 @@ bool JSB_localStorageSetItem(JSContext *cx, uint32_t argc, jsval *vp) {
     return true;
 }
 
+// Arguments: char*, char*
+// Ret value: void
+bool JSB_localStorageClear(JSContext *cx, uint32_t argc, jsval *vp) {
+    JSB_PRECONDITION2( argc == 0, cx, false, "Invalid number of arguments" );
+    JS::CallArgs args = JS::CallArgsFromVp(argc, vp);
+
+    localStorageClear();
+    args.rval().setUndefined();
+    return true;
+}
 
 //#endif // JSB_INCLUDE_SYSTEM

cocos/scripting/js-bindings/manual/localstorage/js_bindings_system_functions.h

@@ -12,6 +12,7 @@ extern "C" {
 bool JSB_localStorageGetItem(JSContext *cx, uint32_t argc, jsval *vp);
 bool JSB_localStorageRemoveItem(JSContext *cx, uint32_t argc, jsval *vp);
 bool JSB_localStorageSetItem(JSContext *cx, uint32_t argc, jsval *vp);
+bool JSB_localStorageClear(JSContext *cx, uint32_t argc, jsval *vp);
 
 #ifdef __cplusplus
 }

cocos/storage/local-storage/LocalStorage.cpp

@@ -42,6 +42,7 @@ static sqlite3 *_db;
 static sqlite3_stmt *_stmt_select;
 static sqlite3_stmt *_stmt_remove;
 static sqlite3_stmt *_stmt_update;
+static sqlite3_stmt *_stmt_clear;
 
 
 static void localStorageCreateTable()
@@ -80,6 +81,10 @@ void localStorageInit( const std::string& fullpath/* = "" */)
 		// DELETE
 		const char *sql_remove = "DELETE FROM data WHERE key=?;";
 		ret |= sqlite3_prepare_v2(_db, sql_remove, -1, &_stmt_remove, nullptr);
+        
+        // Clear
+        const char *sql_clear = "DELETE FROM data;";
+        ret |= sqlite3_prepare_v2(_db, sql_clear, -1, &_stmt_clear, nullptr);
 
 		if( ret != SQLITE_OK ) {
 			printf("Error initializing DB\n");
@@ -130,11 +135,15 @@ bool localStorageGetItem( const std::string& key, std::string *outItem )
 	ok |= sqlite3_step(_stmt_select);
 	const unsigned char *text = sqlite3_column_text(_stmt_select, 0);
 
-	if( (ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW) || !text)
+	if ( ok != SQLITE_OK && ok != SQLITE_DONE && ok != SQLITE_ROW )
 	{
 		printf("Error in localStorage.getItem()\n");
 		return false;
 	}
+	else if (!text)
+    {
+        return false;
+    }
 	else
     {
         outItem->assign((const char*)text);
@@ -157,4 +166,15 @@ void localStorageRemoveItem( const std::string& key )
 		printf("Error in localStorage.removeItem()\n");
 }
 
+/** removes all items from the LS */
+void localStorageClear()
+{
+    assert( _initialized );
+    
+    int ok = sqlite3_step(_stmt_clear);
+    
+    if( ok != SQLITE_OK && ok != SQLITE_DONE)
+        printf("Error in localStorage.clear()\n");
+}
+
 #endif // #if (CC_TARGET_PLATFORM != CC_PLATFORM_ANDROID)

cocos/storage/local-storage/LocalStorage.h

@@ -51,6 +51,9 @@ bool CC_DLL localStorageGetItem( const std::string& key, std::string *outItem );
 /** Removes an item from the JS. */
 void CC_DLL localStorageRemoveItem( const std::string& key );
 
+/** Removes all items from the JS. */
+void CC_DLL localStorageClear();
+
 // end group
 /// @}