eolian: store unit inside lexer

src/lib/eolian/eo_lexer.c

@@ -1046,6 +1046,7 @@ eo_lexer_set_input(Eo_Lexer *ls, Eolian *state, const char *source)
    next_char(ls);
 
    Eolian_Unit *ncunit = calloc(1, sizeof(Eolian_Unit));
+   ls->unit = ncunit;
    database_unit_init(state, ncunit, ls->filename);
    eina_hash_add(state->units, ls->filename, ncunit);
 }

src/lib/eolian/eo_lexer.h

@@ -168,6 +168,8 @@ typedef struct _Eo_Lexer
    const char  *stream_line;
    /* a pointer to the state this lexer belongs to */
    Eolian      *state;
+   /* the unit being filled during current parsing */
+   Eolian_Unit *unit;
    /* this is jumped to when an error happens */
    jmp_buf      err_jmp;