fix(xml): minor fixes in parsers

docs/src/details/auxiliary-modules/observer/observer.rst

@@ -372,7 +372,7 @@ integer value:
     - Drop-Down
     - Roller
     - Slider
-+    - Scale Section Min/Max values
+    - Scale Section Min/Max values
 
 Any number of Observers can be created for a single Widget, each bound to ONE of
 the above properties.

src/others/observer/lv_observer.h

@@ -545,7 +545,7 @@ lv_observer_t * lv_obj_bind_checked(lv_obj_t * obj, lv_subject_t * subject);
 lv_observer_t * lv_label_bind_text(lv_obj_t * obj, lv_subject_t * subject, const char * fmt);
 #endif
 
-#if LV_USE_LABEL
+#if LV_USE_SPAN
 
 /**
  * Bind an integer, string, or pointer Subject to a Spangroup's Span.
@@ -556,8 +556,8 @@ lv_observer_t * lv_label_bind_text(lv_obj_t * obj, lv_subject_t * subject, const
  *                  or NULL to bind to the value directly.
  * @return          pointer to newly-created Observer
  * @note            `fmt == NULL` can be used only with string and pointer Subjects.
- * @note            If Subject is a pointer and `fmt == NULL`, pointer must point
- *                  to a `\0` terminated string.
+ * @note            If `fmt == NULL` strings and pointers (`\0` terminated string) will be shown
+ *                  as text as they are, integers as %d, floats as %0.1f
  */
 lv_observer_t * lv_spangroup_bind_span_text(lv_obj_t * obj, lv_span_t * span, lv_subject_t * subject, const char * fmt);
 

src/others/xml/lv_xml_style.c

@@ -290,6 +290,8 @@ lv_result_t lv_xml_style_register(lv_xml_component_scope_t * scope, const char *
                 if(value[c] == ' ') item_cnt++;
             }
 
+            /*This not freed automatically as the styles doesn't have any mechanisms to detect
+             * removal of properties. It's assumed that the styles are created once and never freed. */
             int32_t * dsc_array = lv_malloc((item_cnt + 2) * sizeof(int32_t)); /*+2 for LV_GRID_TEMPLATE_LAST*/
 
             char * value_buf = (char *)value;

src/others/xml/lv_xml_utils.c

@@ -83,8 +83,8 @@ int32_t lv_xml_atoi_split(const char ** str, char delimiter)
     int32_t result = 0;
     int sign = 1;
 
-    /* Skip leading whitespace */
-    while(*s == ' ' || *s == '\t')  s++;
+    /* Skip leading whitespace and repeated delimiters */
+    while(*s == delimiter || *s == ' ' || *s == '\t') s++;
 
     /* Handle optional sign */
     if(*s == '-') {
@@ -128,8 +128,8 @@ float lv_xml_atof_split(const char ** str, char delimiter)
     float result = 0.0f;
     int sign = 1;
 
-    /* Skip leading whitespace */
-    while(*s == ' ' || *s == '\t') s++;
+    /* Skip leading whitespace and repeated delimiters */
+    while(*s == delimiter || *s == ' ' || *s == '\t') s++;
 
     /* Handle optional sign */
     if(*s == '-') {
@@ -263,6 +263,11 @@ int32_t lv_xml_strtol(const char * str, char ** endptr, int32_t base)
 
 char * lv_xml_split_str(char ** src, char delimiter)
 {
+    /*Skip multiple delimiters*/
+    while(*src[0] == delimiter) {
+        src++;
+    }
+
     if(*src[0] == '\0') return NULL;
 
     char * src_first = *src;

src/others/xml/parsers/lv_xml_tabview_parser.c

@@ -98,13 +98,14 @@ void * lv_xml_tabview_tab_button_create(lv_xml_parser_state_t * state, const cha
 
     const char * index_str = lv_xml_get_value_of(attrs, "index");
     int32_t index_int = index_str ? lv_xml_atoi(index_str) : 0;
-    if(LV_ABS(index_int) >= btn_cnt) {
-        LV_LOG_WARN("tabindex is out of range, using the first tab instead");
-        index_int = 0;
-    }
 
     void * item = lv_tabview_get_tab_button(tv, index_int);
 
+    if(item == NULL) {
+        LV_LOG_WARN("tabindex is out of range, using the first tab instead");
+        item = lv_tabview_get_tab_button(tv, 0);
+    }
+
     return item;
 }