eolian: add APIs to get unit from object and state from unit

src/lib/eolian/Eolian.h

@@ -580,6 +580,7 @@ EAPI void *eolian_state_error_data_set(Eolian_State *state, void *data);
  * them to Eolian_Object, store or manipulate them and then use this function
  * to check their type in order to for example cast it back.
  *
+ * @see eolian_object_unit_get
  * @see eolian_object_file_get
  * @see eolian_object_line_get
  * @see eolian_object_column_get
@@ -589,12 +590,28 @@ EAPI void *eolian_state_error_data_set(Eolian_State *state, void *data);
  */
 EAPI Eolian_Object_Type eolian_object_type_get(const Eolian_Object *obj);
 
+/*
+ * @brief Get the unit the object comes from.
+ *
+ * This returns the unit the object is located in.
+ *
+ * @see eolian_object_file_get
+ * @see eolian_object_type_get
+ * @see eolian_object_line_get
+ * @see eolian_object_column_get
+ * @see eolian_object_name_get
+ *
+ * @ingroup Eolian
+ */
+EAPI const Eolian_Unit *eolian_object_unit_get(const Eolian_Object *obj);
+
 /*
  * @brief Get the name of the file the object comes from.
  *
  * This returns the name of the file the object was declared in. It's not
  * a full path, just the file name.
  *
+ * @see eolian_object_unit_get
  * @see eolian_object_type_get
  * @see eolian_object_line_get
  * @see eolian_object_column_get
@@ -609,6 +626,7 @@ EAPI const char *eolian_object_file_get(const Eolian_Object *obj);
  *
  * This returns the line number in the file the object was declared at.
  *
+ * @see eolian_object_unit_get
  * @see eolian_object_type_get
  * @see eolian_object_file_get
  * @see eolian_object_column_get
@@ -626,6 +644,7 @@ EAPI int eolian_object_line_get(const Eolian_Object *obj);
  * assumes all input files are encoded in UTF-8, so this is really the
  * code point number, not the byte number.
  *
+ * @see eolian_object_unit_get
  * @see eolian_object_type_get
  * @see eolian_object_file_get
  * @see eolian_object_line_get
@@ -642,6 +661,7 @@ EAPI int eolian_object_column_get(const Eolian_Object *obj);
  * For toplevel file declarations, this will be the fully namespaced
  * name, for things like params this will be just the name itself.
  *
+ * @see eolian_object_unit_get
  * @see eolian_object_type_get
  * @see eolian_object_file_get
  * @see eolian_object_line_get
@@ -840,6 +860,20 @@ EAPI const Eolian_Unit *eolian_state_unit_by_file_get(const Eolian_State *state,
  */
 EAPI Eina_Iterator *eolian_state_units_get(const Eolian_State *state);
 
+/*
+ * @brief Get the state associated with the unit.
+ *
+ * Technically you can cast away the const to make the state mutable
+ * again, it's the same pointer after all. But this is considered a
+ * bad practice, because you're only supposed to use mutable objects
+ * at the very beginning and then just read.
+ *
+ * @param[in] unit The unit.
+ *
+ * @ingroup Eolian
+ */
+EAPI const Eolian_State *eolian_unit_state_get(const Eolian_Unit *unit);
+
 /*
  * @brief Get the children (dependencies) of a unit.
  *

src/lib/eolian/eo_parser.c

@@ -13,6 +13,7 @@
    has_##var = EINA_TRUE;
 
 #define FILL_BASE(exp, ls, l, c, tp) \
+   (exp).unit = ls->unit; \
    (exp).file = eina_stringshare_ref(ls->filename); \
    (exp).line = l; \
    (exp).column = c; \

src/lib/eolian/eolian_database.c

@@ -25,6 +25,13 @@ eolian_object_type_get(const Eolian_Object *obj)
    return obj->type;
 }
 
+EAPI const Eolian_Unit *
+eolian_object_unit_get(const Eolian_Object *obj)
+{
+   if (!obj) return NULL;
+   return obj->unit;
+}
+
 EAPI const char *
 eolian_object_file_get(const Eolian_Object *obj)
 {
@@ -1013,6 +1020,13 @@ eolian_state_enums_by_file_get(const Eolian_State *state, const char *file_name)
    return eina_list_iterator_new(l);
 }
 
+EAPI const Eolian_State *
+eolian_unit_state_get(const Eolian_Unit *unit)
+{
+   if (!unit) return NULL;
+   return unit->state;
+}
+
 EAPI Eina_Iterator *
 eolian_unit_children_get(const Eolian_Unit *unit)
 {

src/lib/eolian/eolian_database.h

@@ -75,6 +75,7 @@ struct _Eolian_State
 
 struct _Eolian_Object
 {
+   Eolian_Unit *unit;
    Eina_Stringshare *file;
    Eina_Stringshare *name;
    int line;