eolian: add API for master unit creation

src/lib/eolian/Eolian.h

@@ -522,6 +522,32 @@ EAPI int eolian_init(void);
  */
 EAPI int eolian_shutdown(void);
 
+/*
+ * @brief Create a new primary unit for Eolian state.
+ *
+ * This creates a nameless "master unit" which holds all Eolian state.
+ * You need to free this with eolian_free once you're done.
+ *
+ * @return A new master unit (or NULL on failure).
+ *
+ * @ingroup Eolian
+ */
+EAPI Eolian_Unit *eolian_new(void);
+
+/*
+ * @brief Free a master unit.
+ *
+ * You can use this to free an Eolian state. Do not EVER use this to free
+ * any unit other than master unit, as these are managed by the master unit
+ * and freeing them would result in incorrect behavior.
+ *
+ * If the input is NULL, this function has no effect.
+ *
+ * @param[in] unit the master unit to free
+ *
+ */
+EAPI void eolian_free(Eolian_Unit *unit);
+
 /*
  * @brief Scan the given directory (recursively) and search for .eo and
  * .eot files.

src/lib/eolian/eolian_database.c

@@ -602,10 +602,13 @@ eolian_doc_token_ref_get(const Eolian_Unit *unit, const Eolian_Doc_Token *tok,
 void
 database_unit_init(Eolian_Unit *unit, Eina_Stringshare *fname)
 {
-   Eolian_Unit *ocunit = _cunit;
-   unit->parent = ocunit;
-   if (ocunit)
-     eina_hash_add(ocunit->children, fname, unit);
+   if (fname)
+     {
+        Eolian_Unit *ocunit = _cunit;
+        unit->parent = ocunit;
+        if (ocunit)
+          eina_hash_add(ocunit->children, fname, unit);
+     }
 
    unit->children   = eina_hash_stringshared_new(NULL);
    unit->classes    = eina_hash_stringshared_new(NULL);
@@ -614,7 +617,9 @@ database_unit_init(Eolian_Unit *unit, Eina_Stringshare *fname)
    unit->aliases    = eina_hash_stringshared_new(NULL);
    unit->structs    = eina_hash_stringshared_new(NULL);
    unit->enums      = eina_hash_stringshared_new(NULL);
-   _cunit = unit;
+
+   if (fname)
+     _cunit = unit;
 }
 
 void
@@ -631,6 +636,23 @@ database_unit_del(Eolian_Unit *unit)
    eina_hash_free(unit->enums);
 }
 
+EAPI Eolian_Unit *
+eolian_new(void)
+{
+   Eolian_Unit *nunit = calloc(1, sizeof(Eolian_Unit));
+   if (!nunit)
+     return NULL;
+
+   database_unit_init(nunit, NULL);
+   return nunit;
+}
+
+EAPI void
+eolian_free(Eolian_Unit *unit)
+{
+   database_unit_del(unit);
+}
+
 #define EO_SUFFIX ".eo"
 #define EOT_SUFFIX ".eot"