diagnostics: replace "user token number" by "token code"

Yet, don't change the structure identifier to avoid introducing
conflicts in Vincent Imbimbo's PR (which, amusingly enough, is about
conflicts).

* src/symtab.c: here.
* tests/diagnostics.at, tests/input.at: Adjust.

TODO

@@ -5,6 +5,7 @@
 - YYERRCODE, YYUNDEF, YYEOF
 - i18n in Java
 - symbol.type_get should be kind_get, and it's not documented.
+- token code instead of token user number etc.
 
 ** User token number, internal symbol number, external token number, etc.
 There is some confusion over these terms, which is even a problem for
@@ -28,21 +29,6 @@ The token numbered as 0.
 Therefore each time the scanner returns an (external) token number,
 it must be mapped to the (internal) symbol number.
 
-
-*** The code
-uses "user token number" in most places.
-
-  if (sym->content->class != token_sym)
-    complain (&loc, complaint,
-              _("nonterminals cannot be given an explicit number"));
-  else if (*user_token_numberp != USER_NUMBER_UNDEFINED
-           && *user_token_numberp != user_token_number)
-    complain (&loc, complaint, _("redefining user token number of %s"),
-              sym->tag);
-  else if (user_token_number == INT_MAX)
-    complain (&loc, complaint, _("user token number of %s too large"),
-              sym->tag);
-
 *** M4
 Make it consistent with the rest (it uses "user_number" and "number").
 

src/symtab.c

@@ -166,9 +166,9 @@ symbol_free (void *ptr)
 /* If needed, swap first and second so that first has the earliest
    location (according to location_cmp).
 
-   Many symbol features (e.g., user token numbers) are not assigned
-   during the parsing, but in a second step, via a traversal of the
-   symbol table sorted on tag.
+   Many symbol features (e.g., token codes) are not assigned during
+   parsing, but in a second step, via a traversal of the symbol table
+   sorted on tag.
 
    However, error messages make more sense if we keep the first
    declaration first.
@@ -576,13 +576,13 @@ symbol_user_token_number_set (symbol *sym, int user_token_number, location loc)
   int *user_token_numberp = &sym->content->user_token_number;
   if (sym->content->class != token_sym)
     complain (&loc, complaint,
-              _("nonterminals cannot be given an explicit number"));
+              _("nonterminals cannot be given a token code"));
   else if (*user_token_numberp != USER_NUMBER_UNDEFINED
            && *user_token_numberp != user_token_number)
-    complain (&loc, complaint, _("redefining user token number of %s"),
+    complain (&loc, complaint, _("redefining code of token %s"),
               sym->tag);
   else if (user_token_number == INT_MAX)
-    complain (&loc, complaint, _("user token number of %s too large"),
+    complain (&loc, complaint, _("code of token %s too large"),
               sym->tag);
   else
     {
@@ -739,7 +739,7 @@ complain_user_token_number_redeclared (int num, symbol *first, symbol *second)
 {
   symbols_sort (&first, &second);
   complain (&second->location, complaint,
-            _("user token number %d redeclaration for %s"),
+            _("code %d reassigned to token %s"),
             num, second->tag);
   subcomplain (&first->location, complaint,
                _("previous declaration for %s"),
@@ -1044,8 +1044,8 @@ symbols_token_translations_init (void)
 {
   bool num_256_available_p = true;
 
-  /* Find the highest user token number, and whether 256, the POSIX
-     preferred user token number for the error token, is used.  */
+  /* Find the highest token code, and whether 256, the POSIX preferred
+     token code for the error token, is used.  */
   max_user_token_number = 0;
   for (int i = 0; i < ntokens; ++i)
     {

tests/diagnostics.at

@@ -181,7 +181,7 @@ exp:
 input.y:12.8-10: <note>note:</note> previous declaration
    12 | %token <note>foo</note> 123123
       |        <note>^~~</note>
-input.y:13.12-17: <error>error:</error> redefining user token number of foo
+input.y:13.12-17: <error>error:</error> redefining code of token foo
    13 | %token foo <error>123</error>
       |            <error>^~~~~~</error>
 input.y:14.8-10: <warning>warning:</warning> symbol foo redeclared [<warning>-Wother</warning>]

tests/input.at

@@ -269,10 +269,10 @@ AT_BISON_CHECK([-fcaret input.y], [1], [],
 [[input.y:1.13-24: error: nonterminals cannot be given a string alias
     1 | %nterm expr "expression";
       |             ^~~~~~~~~~~~
-input.y:2.13-15: error: nonterminals cannot be given an explicit number
+input.y:2.13-15: error: nonterminals cannot be given a token code
     2 | %nterm term 123;
       |             ^~~
-input.y:3.13-15: error: nonterminals cannot be given an explicit number
+input.y:3.13-15: error: nonterminals cannot be given a token code
     3 | %nterm fact 124 "factor";
       |             ^~~
 input.y:3.17-24: error: nonterminals cannot be given a string alias
@@ -322,7 +322,7 @@ AT_BISON_CHECK([-fcaret input.y], [1], [],
 input.y:1.8-12: note: previous declaration
     1 | %token error 123
       |        ^~~~~
-input.y:2.14-16: error: redefining user token number of error
+input.y:2.14-16: error: redefining code of token error
     2 | %token error 124
       |              ^~~
 ]])
@@ -1194,7 +1194,7 @@ AT_BISON_CHECK([-fcaret input.y], [1], [],
 [[input.y:2.17-21: warning: symbol "foo" used more than once as a literal string [-Wother]
     2 |          BAR 42 "foo"
       |                 ^~~~~
-input.y:2.10-12: error: user token number 42 redeclaration for BAR
+input.y:2.10-12: error: code 42 reassigned to token BAR
     2 |          BAR 42 "foo"
       |          ^~~
 input.y:1.15-19: note: previous declaration for "foo"
@@ -1544,7 +1544,7 @@ AT_CHECK_REQUIRE(100.0, 63)
 AT_SETUP([String aliases for character tokens])
 
 # Bison once thought a character token and its alias were different
-# symbols with the same user token number.
+# symbols with the same code.
 
 AT_BISON_OPTION_PUSHDEFS
 AT_DATA_GRAMMAR([input.y],
@@ -1643,9 +1643,9 @@ start: DECIMAL_1 HEXADECIMAL_2;
 ]])
 
 AT_BISON_CHECK([redecl.y], [1], [],
-[[redecl.y:10.10-22: error: user token number 11259375 redeclaration for HEXADECIMAL_1
+[[redecl.y:10.10-22: error: code 11259375 reassigned to token HEXADECIMAL_1
 redecl.y:9.8-16: note: previous declaration for DECIMAL_1
-redecl.y:12.10-18: error: user token number 16702650 redeclaration for DECIMAL_2
+redecl.y:12.10-18: error: code 16702650 reassigned to token DECIMAL_2
 redecl.y:11.10-22: note: previous declaration for HEXADECIMAL_2
 ]])
 
@@ -1659,9 +1659,9 @@ start: TOO_LARGE_DEC TOO_LARGE_HEX
 
 AT_BISON_CHECK([too-large.y], [1], [],
 [[too-large.y:9.22-42: error: integer out of range: '999999999999999999999'
-too-large.y:9.22-42: error: user token number of TOO_LARGE_DEC too large
+too-large.y:9.22-42: error: code of token TOO_LARGE_DEC too large
 too-large.y:10.24-44: error: integer out of range: '0xFFFFFFFFFFFFFFFFFFF'
-too-large.y:10.24-44: error: user token number of TOO_LARGE_HEX too large
+too-large.y:10.24-44: error: code of token TOO_LARGE_HEX too large
 ]])
 
 AT_BISON_OPTION_POPDEFS