X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/ab7f29f8f9a7ad89b6a3163f913e1ee2b7889223..e0c653e7e660c353c59b054de571474450aa4c92:/src/symtab.c

diff --git a/src/symtab.c b/src/symtab.c
index 1db83f63..b65bdd48 100644
--- a/src/symtab.c
+++ b/src/symtab.c
@@ -128,6 +128,41 @@ symbol_print (symbol *s, FILE *f)
 #undef SYMBOL_ATTR_PRINT
 #undef SYMBOL_CODE_PRINT
 
+
+/*----------------------------------.
+| Whether S is a valid identifier.  |
+`----------------------------------*/
+
+static bool
+is_identifier (uniqstr s)
+{
+  static char const alphanum[26 + 26 + 1 + 10] =
+    "abcdefghijklmnopqrstuvwxyz"
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+    "_"
+    "0123456789";
+  if (!s || ! memchr (alphanum, *s, sizeof alphanum - 10))
+    return false;
+  for (++s; *s; ++s)
+    if (! memchr (alphanum, *s, sizeof alphanum))
+      return false;
+  return true;
+}
+
+
+/*-----------------------------------------------.
+| Get the identifier associated to this symbol.  |
+`-----------------------------------------------*/
+uniqstr
+symbol_id_get (symbol const *sym)
+{
+  aver (sym->user_token_number != USER_NUMBER_ALIAS);
+  if (sym->alias)
+    sym = sym->alias;
+  return is_identifier (sym->tag) ? sym->tag : 0;
+}
+
+
 /*------------------------------------------------------------------.
 | Complain that S's WHAT is redeclared at SECOND, and was first set |
 | at FIRST.                                                         |
@@ -836,9 +871,8 @@ symbols_token_translations_init (void)
   token_translations = xnmalloc (max_user_token_number + 1,
 				 sizeof *token_translations);
 
-  /* Initialize all entries for literal tokens to 2, the internal
-     token number for $undefined, which represents all invalid inputs.
-     */
+  /* Initialize all entries for literal tokens to the internal token
+     number for $undefined, which represents all invalid inputs.  */
   for (i = 0; i < max_user_token_number + 1; i++)
     token_translations[i] = undeftoken->number;
   symbols_do (symbol_translation_processor, NULL);