Simplify handling of '.' and '-' after unbracketed named references.

* doc/bison.texinfo (Mid-Rule Actions): Mention that periods and
dashes make symbol names less convenient for named references.
* src/scan-code.l:
(handle_action_dollar): New arg textlen.  All callers changed.
(handle_action_at): Likewise.  Also, args are pointers to const.
(ref_tail_fields): Remove; no longer used.
(letter): Now includes '-' and '.', since this is for Bison
identifiers.
(id): Now the simpler traditional defn, since letters now include
'-' and '.'.
(c_letter, c_id): New defns.
(ref): Use c_id for unbracketed IDs.
(<SC_RULE_ACTION>): Simplify, now that the distinction between
Bison and unbracketed IDs are now in the regular expressions.
(VARIANT_BAD_BRACKETING): Remove.
(VARIANT_NOT_VISIBLE_FROM_MIDRULE): Renumber.
(find_prefix_end): Remove, replacing with ....
(identifier_matches): New function.
(variant_add): Use it.  Omit EXPLICIT_BRACKETING arg; no longer
needed.  CP arg is pointer to constant.  All callers changed.
(show_sub_messages): Remove args CP, EXPLICIT_BRACKETING, DOLLAR_OR_AT.
New arg TEXT.  All callers changed.  Do not worry about showing
trailing context.
(parse_ref): Args CP, RULE, TEXT are now pointers to const.  New
arg TEXTLEN.  Remove arg DOLLAR_OR_AT.  All callers changed.
Simplify code now that the regular expressions capture the
restrictions.
* src/scan-gram.l (letter, id): Adjust to match scan-code.l.
* src/symlist.c (symbol_list_null): Arg is now pointer to const.
* src/symlist.h: Likewise.
* tests/named-refs.at (Misleading references): These are now caught
by the C compiler, not by Bison; that's good enough.  Adjust test
to reflect this.
(Many kinds of errors, Unresolved references): Adjust expected
diagnostics to match new behavior.  The same errors are caught,
though the diagnostics are not quite as fancy.
($ or @ followed by . or -): Likewise.  Also, Make the grammar
unambiguous, so that diagnostics are not complicated by ambiguity
warnings.

diff --git a/ChangeLog b/ChangeLog
index 9255aab55cc563bf40c9f2b597a0c288549c29b0..1ed26ad9be4195b17bb54ed9b1d9f55968640e11 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,46 @@
 2011-01-09  Paul Eggert  <eggert@cs.ucla.edu>
 
 2011-01-09  Paul Eggert  <eggert@cs.ucla.edu>
 

+       Simplify handling of '.' and '-' after unbracketed named references.
+       * doc/bison.texinfo (Mid-Rule Actions): Mention that periods and
+       dashes make symbol names less convenient for named references.
+       * src/scan-code.l:
+       (handle_action_dollar): New arg textlen.  All callers changed.
+       (handle_action_at): Likewise.  Also, args are pointers to const.
+       (ref_tail_fields): Remove; no longer used.
+       (letter): Now includes '-' and '.', since this is for Bison
+       identifiers.
+       (id): Now the simpler traditional defn, since letters now include
+       '-' and '.'.
+       (c_letter, c_id): New defns.
+       (ref): Use c_id for unbracketed IDs.
+       (<SC_RULE_ACTION>): Simplify, now that the distinction between
+       Bison and unbracketed IDs are now in the regular expressions.
+       (VARIANT_BAD_BRACKETING): Remove.
+       (VARIANT_NOT_VISIBLE_FROM_MIDRULE): Renumber.
+       (find_prefix_end): Remove, replacing with ....
+       (identifier_matches): New function.
+       (variant_add): Use it.  Omit EXPLICIT_BRACKETING arg; no longer
+       needed.  CP arg is pointer to constant.  All callers changed.
+       (show_sub_messages): Remove args CP, EXPLICIT_BRACKETING, DOLLAR_OR_AT.
+       New arg TEXT.  All callers changed.  Do not worry about showing
+       trailing context.
+       (parse_ref): Args CP, RULE, TEXT are now pointers to const.  New
+       arg TEXTLEN.  Remove arg DOLLAR_OR_AT.  All callers changed.
+       Simplify code now that the regular expressions capture the
+       restrictions.
+       * src/scan-gram.l (letter, id): Adjust to match scan-code.l.
+       * src/symlist.c (symbol_list_null): Arg is now pointer to const.
+       * src/symlist.h: Likewise.
+       * tests/named-refs.at (Misleading references): These are now caught
+       by the C compiler, not by Bison; that's good enough.  Adjust test
+       to reflect this.
+       (Many kinds of errors, Unresolved references): Adjust expected
+       diagnostics to match new behavior.  The same errors are caught,
+       though the diagnostics are not quite as fancy.
+       ($ or @ followed by . or -): Likewise.  Also, Make the grammar
+       unambiguous, so that diagnostics are not complicated by ambiguity
+       warnings.
+

        Fix minor problems encountered by a fresh bootstrap.
        * data/glr.c, data/yacc.c: Do not use apostrophes in '#' comments,
        as they confuse xgettext, which tries to parse them as C character
        Fix minor problems encountered by a fresh bootstrap.
        * data/glr.c, data/yacc.c: Do not use apostrophes in '#' comments,
        as they confuse xgettext, which tries to parse them as C character

diff --git a/doc/bison.texinfo b/doc/bison.texinfo
index cc1e0645c311dd7810a18530ee65ba81093602ad..29d636493317ab47ceb42c88c17469e247b47362 100644 (file)
--- a/doc/bison.texinfo
+++ b/doc/bison.texinfo
@@ -3125,7 +3125,9 @@ By convention, it should be all lower case.
 
 Symbol names can contain letters, underscores, periods, dashes, and (not
 at the beginning) digits.  Dashes in symbol names are a GNU
 
 Symbol names can contain letters, underscores, periods, dashes, and (not
 at the beginning) digits.  Dashes in symbol names are a GNU

-extension, incompatible with POSIX Yacc.  Terminal symbols
+extension, incompatible with POSIX Yacc.  Periods and dashes make symbol
+names less convenient to use with named references, which require brackets
+around such names (@pxref{Named References}).  Terminal symbols

 that contain periods or dashes make little sense: since they are not
 valid symbols (in most programming languages) they are not exported as
 token names.
 that contain periods or dashes make little sense: since they are not
 valid symbols (in most programming languages) they are not exported as
 token names.

diff --git a/src/scan-code.l b/src/scan-code.l
index 3dd10443fa40338d6a6e8d3a708a4f71702c7b88..9a08af7a7664917a8852a320bd64c6bf5208235f 100644 (file)
--- a/src/scan-code.l
+++ b/src/scan-code.l
@@ -47,12 +47,9 @@ YY_DECL;
 
 #define YY_USER_ACTION  location_compute (loc, &loc->end, yytext, yyleng);
 
 
 #define YY_USER_ACTION  location_compute (loc, &loc->end, yytext, yyleng);
 

-static void handle_action_dollar (symbol_list *rule, char *cp,
-                                 location dollar_loc);
-static void handle_action_at (symbol_list *rule, char *cp, location at_loc);
-
-/* A string to be pushed to obstack after dollar/at has been handled. */
-static char *ref_tail_fields;
+static void handle_action_dollar (symbol_list *, char *, unsigned, location);
+static void handle_action_at (symbol_list const *, char const *, unsigned,
+                             location);

 
 static location the_location;
 static location *loc = &the_location;
 
 static location the_location;
 static location *loc = &the_location;


@@ -82,12 +79,16 @@ tag  [^\0\n>]+
    white space between the backslash and the newline.  */
 splice  (\\[ \f\t\v]*\n)*
 
    white space between the backslash and the newline.  */
 splice  (\\[ \f\t\v]*\n)*
 

-/* C style identifier. Must start with letter. Will be used for
-   named symbol references. Shall be kept synchronized with
-   scan-gram.l "letter" and "id". */
-letter   [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
-id       -*(-|{letter}({letter}|[-0-9])*)
-ref      -?[0-9]+|{id}|"["{id}"]"|"$"
+/* A Bison identifier.  Keep this synchronized with scan-gram.l "id".  */
+letter   [-.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id       {letter}({letter}|[0-9])*
+
+/* An identifier that can appear unbracketed in a reference.
+   This happens to be the same as a C-language identifier.  */
+c_letter  [abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+c_id     {c_letter}({c_letter}|[0-9])*
+
+ref      -?[0-9]+|{c_id}|"["{id}"]"|"$"

 
 %%
 
 
 %%
 


@@ -182,19 +183,11 @@ ref      -?[0-9]+|{id}|"["{id}"]"|"$"
 <SC_RULE_ACTION>
 {
   "$"("<"{tag}">")?{ref}  {
 <SC_RULE_ACTION>
 {
   "$"("<"{tag}">")?{ref}  {

-    ref_tail_fields = 0;
-    handle_action_dollar (self->rule, yytext, *loc);
-    if (ref_tail_fields) {
-      obstack_sgrow (&obstack_for_string, ref_tail_fields);
-    }
+    handle_action_dollar (self->rule, yytext, yyleng, *loc);

     need_semicolon = true;
   }
   "@"{ref} {
     need_semicolon = true;
   }
   "@"{ref} {

-    ref_tail_fields = 0;
-    handle_action_at (self->rule, yytext, *loc);
-    if (ref_tail_fields) {
-      obstack_sgrow (&obstack_for_string, ref_tail_fields);
-    }
+    handle_action_at (self->rule, yytext, yyleng, *loc);

     need_semicolon = true;
   }
   "$"  {
     need_semicolon = true;
   }
   "$"  {


@@ -338,13 +331,9 @@ typedef struct
    by an explicit symbol reference. */
 #define VARIANT_HIDDEN (1 << 0)
 
    by an explicit symbol reference. */
 #define VARIANT_HIDDEN (1 << 0)
 

-/* Set when the variant refers to a symbol containing
-   dots or dashes. Will require explicit bracketing. */
-#define VARIANT_BAD_BRACKETING (1 << 1)
-

 /* Set when the variant refers to a symbol which is
    not visible from current midrule. */
 /* Set when the variant refers to a symbol which is
    not visible from current midrule. */

-#define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 2)
+#define VARIANT_NOT_VISIBLE_FROM_MIDRULE (1 << 1)

 
 static variant *variant_table = 0;
 static unsigned variant_table_size = 0;
 
 static variant *variant_table = 0;
 static unsigned variant_table_size = 0;


@@ -372,31 +361,25 @@ variant_table_free (void)
   variant_table_size = variant_count = 0;
 }
 
   variant_table_size = variant_count = 0;
 }
 

-static char *
-find_prefix_end (const char *prefix, char *begin, char *end)
+/* Return TRUE if ID matches the string from CP up to CP_END.
+   The string does not contain null bytes.  */
+static bool
+identifier_matches (char const *id, char const *cp, char const *cp_end)

 {
 {

-  char *ptr = begin;
-
-  for (; *prefix && ptr != end; ++prefix, ++ptr)
-    if (*prefix != *ptr)
-      return 0;
-
-  if (*prefix)
-    return 0;
-
-  return ptr;
+  while (cp != cp_end)
+    if (*id++ != *cp++)
+      return false;
+  return !*id;

 }
 
 }
 

+/* If scanning ID, return a new variant with that ID, at location
+   ID_LOC with index SYMBOL_INDEX.  Otherwise, return NULL.  The
+   currently scanned identifier starts at CP and ends at CP_END.  */

 static variant *
 variant_add (uniqstr id, location id_loc, unsigned symbol_index,
 static variant *
 variant_add (uniqstr id, location id_loc, unsigned symbol_index,

-            char *cp, char *cp_end, bool explicit_bracketing)
+            char const *cp, char const *cp_end)

 {
 {

-  char *prefix_end;
-
-  prefix_end = find_prefix_end (id, cp, cp_end);
-  if (prefix_end &&
-      (prefix_end == cp_end ||
-       (!explicit_bracketing && is_dot_or_dash (*prefix_end))))
+  if (identifier_matches (id, cp, cp_end))

     {
       variant *r = variant_table_grow ();
       r->symbol_index = symbol_index;
     {
       variant *r = variant_table_grow ();
       r->symbol_index = symbol_index;


@@ -421,11 +404,15 @@ get_at_spec(unsigned symbol_index)
   return at_buf;
 }
 
   return at_buf;
 }
 

+/* Show a subsidiary message for a problem with a grammar rule.  TEXT
+   points to the problematic reference.  MIDRULE_RHS_INDEX is the rhs
+   index (1-origin) in the rule.  If IS_WARNING, it is a warning,
+   otherwise a complaint.  Indent the message INDENT spaces.  */

 static void
 static void

-show_sub_messages (const char* cp, bool explicit_bracketing,
-                   int midrule_rhs_index, char dollar_or_at,
+show_sub_messages (char const *text, int midrule_rhs_index,

                    bool is_warning, unsigned indent)
 {
                    bool is_warning, unsigned indent)
 {

+  char dollar_or_at = *text;

   unsigned i;
 
   for (i = 0; i < variant_count; ++i)
   unsigned i;
 
   for (i = 0; i < variant_count; ++i)


@@ -445,8 +432,6 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
       else
        {
          static struct obstack msg_buf;
       else
        {
          static struct obstack msg_buf;

-         const char *tail = explicit_bracketing ? "" :
-           cp + strlen (var->id);

          const char *id = var->hidden_by ? var->hidden_by->id :
            var->id;
          location id_loc = var->hidden_by ? var->hidden_by->loc :
          const char *id = var->hidden_by ? var->hidden_by->id :
            var->id;
          location id_loc = var->hidden_by ? var->hidden_by->loc :


@@ -460,7 +445,6 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
            obstack_fgrow1 (&msg_buf, "[%s]", id);
          else
            obstack_sgrow (&msg_buf, id);
            obstack_fgrow1 (&msg_buf, "[%s]", id);
          else
            obstack_sgrow (&msg_buf, id);

-         obstack_sgrow (&msg_buf, tail);

 
          if (var->err & VARIANT_HIDDEN)
            {
 
          if (var->err & VARIANT_HIDDEN)
            {


@@ -469,7 +453,6 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
                obstack_fgrow1 (&msg_buf, "[%s]", var->id);
              else
                obstack_sgrow (&msg_buf, var->id);
                obstack_fgrow1 (&msg_buf, "[%s]", var->id);
              else
                obstack_sgrow (&msg_buf, var->id);

-             obstack_sgrow (&msg_buf, tail);

            }
 
          obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec);
            }
 
          obstack_fgrow1 (&msg_buf, _(" at %s"), at_spec);


@@ -504,16 +487,22 @@ show_sub_messages (const char* cp, bool explicit_bracketing,
 /* Sub-messages indent. */
 #define SUB_INDENT (4)
 
 /* Sub-messages indent. */
 #define SUB_INDENT (4)
 

-/* Parse named or positional reference. In case of positional
-   references, can return negative values for $-n "deep" stack
-   accesses. */
+/* Return the index of a named or positional reference starting at CP
+   for a rule RULE of length RULE_LENGTH.  If MIDRULE_RHS_INDEX is
+   nonzero, this is a generated midrule whose rhs index (1-origin) is
+   MIDRULE_RHS_INDEX in the parent rule.  The entire semantic value
+   containing the reference is TEXT, of length TEXTLEN.  Its location
+   is TEXT_LOC.
+
+   In case of positional references, this can return negative values
+   for $-n "deep" stack accesses.  */

 static long int
 static long int

-parse_ref (char *cp, symbol_list *rule, int rule_length,
-          int midrule_rhs_index, char *text, location text_loc,
-          char dollar_or_at)
+parse_ref (char const *cp, symbol_list const *rule, int rule_length,
+          int midrule_rhs_index, char const *text, unsigned textlen,
+          location text_loc)

 {
 {

-  symbol_list *l;
-  char *cp_end;
+  symbol_list const *l;
+  char const *cp_end;

   bool explicit_bracketing;
   unsigned i;
   unsigned valid_variants = 0;
   bool explicit_bracketing;
   unsigned i;
   unsigned valid_variants = 0;


@@ -522,9 +511,9 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
   if ('$' == *cp)
     return LHS_REF;
 
   if ('$' == *cp)
     return LHS_REF;
 

-  if (c_isdigit (*cp) || (*cp == '-' && c_isdigit (* (cp + 1))))
+  if (c_isdigit (*cp) || *cp == '-')

     {
     {

-      long int num = strtol (cp, &cp, 10);
+      long int num = strtol (cp, NULL, 10);

       if (1 - INT_MAX + rule_length <= num && num <= rule_length)
        return num;
       else
       if (1 - INT_MAX + rule_length <= num && num <= rule_length)
        return num;
       else


@@ -535,32 +524,9 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
        }
     }
 
        }
     }
 

-  if ('[' == *cp)
-    {
-      /* Ignore the brackets. */
-      char *p;
-      for (p = ++cp; *p != ']'; ++p)
-       continue;
-      cp_end = p;
-
-      explicit_bracketing = true;
-    }
-  else
-    {
-      /* Take all characters of the name. */
-      char* p;
-      for (p = cp; *p; ++p)
-       if (is_dot_or_dash (*p))
-         {
-           ref_tail_fields = p;
-           break;
-         }
-      for (p = cp; *p; ++p)
-       continue;
-      cp_end = p;
-
-      explicit_bracketing = false;
-    }
+  explicit_bracketing = (*cp == '[');
+  cp += explicit_bracketing;
+  cp_end = text + textlen - explicit_bracketing;

 
   /* Add all relevant variants. */
   {
 
   /* Add all relevant variants. */
   {


@@ -574,13 +540,13 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
          continue;
 
        var = variant_add (l->content.sym->tag, l->sym_loc,
          continue;
 
        var = variant_add (l->content.sym->tag, l->sym_loc,

-                           symbol_index, cp, cp_end, explicit_bracketing);
+                           symbol_index, cp, cp_end);

        if (var && l->named_ref)
          var->hidden_by = l->named_ref;
 
        if (l->named_ref)
          variant_add (l->named_ref->id, l->named_ref->loc,
        if (var && l->named_ref)
          var->hidden_by = l->named_ref;
 
        if (l->named_ref)
          variant_add (l->named_ref->id, l->named_ref->loc,

-                       symbol_index, cp, cp_end, explicit_bracketing);
+                       symbol_index, cp, cp_end);

       }
   }
 
       }
   }
 


@@ -595,10 +561,6 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
          && (symbol_index == 0 || midrule_rhs_index < symbol_index))
         var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
 
          && (symbol_index == 0 || midrule_rhs_index < symbol_index))
         var->err |= VARIANT_NOT_VISIBLE_FROM_MIDRULE;
 

-      /* Check correct bracketing. */
-      if (!explicit_bracketing && contains_dot_or_dash (var->id))
-        var->err |= VARIANT_BAD_BRACKETING;
-

       /* Check using of hidden symbols. */
       if (var->hidden_by)
         var->err |= VARIANT_HIDDEN;
       /* Check using of hidden symbols. */
       if (var->hidden_by)
         var->err |= VARIANT_HIDDEN;


@@ -614,8 +576,7 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
     {
     case 0:
       {
     {
     case 0:
       {

-        unsigned len = (explicit_bracketing || !ref_tail_fields) ?
-          cp_end - cp : ref_tail_fields - cp;
+        unsigned len = cp_end - cp;

         unsigned indent = 0;
 
         complain_at_indent (text_loc, &indent, _("invalid reference: %s"),
         unsigned indent = 0;
 
         complain_at_indent (text_loc, &indent, _("invalid reference: %s"),


@@ -629,7 +590,7 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
             const char *format =
               _("syntax error after `%c', expecting integer, letter,"
                 " `_', `[', or `$'");
             const char *format =
               _("syntax error after `%c', expecting integer, letter,"
                 " `_', `[', or `$'");

-            complain_at_indent (sym_loc, &indent, format, dollar_or_at);
+            complain_at_indent (sym_loc, &indent, format, *text);

           }
         else if (midrule_rhs_index)
           {
           }
         else if (midrule_rhs_index)
           {


@@ -647,8 +608,7 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
           }
 
         if (variant_count > 0)
           }
 
         if (variant_count > 0)

-          show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
-                             dollar_or_at, false, indent);
+          show_sub_messages (text, midrule_rhs_index, false, indent);

         return INVALID_REF;
       }
     case 1:
         return INVALID_REF;
       }
     case 1:


@@ -658,8 +618,8 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
           {
             warn_at_indent (text_loc, &indent, _("misleading reference: %s"),
                             quote (text));
           {
             warn_at_indent (text_loc, &indent, _("misleading reference: %s"),
                             quote (text));

-            show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
-                               dollar_or_at, true, indent + SUB_INDENT);
+            show_sub_messages (text, midrule_rhs_index, true,
+                              indent + SUB_INDENT);

           }
         {
           unsigned symbol_index =
           }
         {
           unsigned symbol_index =


@@ -673,8 +633,8 @@ parse_ref (char *cp, symbol_list *rule, int rule_length,
         unsigned indent = 0;
         complain_at_indent (text_loc, &indent, _("ambiguous reference: %s"),
                             quote (text));
         unsigned indent = 0;
         complain_at_indent (text_loc, &indent, _("ambiguous reference: %s"),
                             quote (text));

-        show_sub_messages (cp, explicit_bracketing, midrule_rhs_index,
-                           dollar_or_at, false, indent + SUB_INDENT);
+        show_sub_messages (text, midrule_rhs_index, false,
+                          indent + SUB_INDENT);

         return INVALID_REF;
       }
     }
         return INVALID_REF;
       }
     }


@@ -692,13 +652,14 @@ int max_left_semantic_context = 0;
 /*------------------------------------------------------------------.
 | TEXT is pointing to a wannabee semantic value (i.e., a `$').      |
 |                                                                   |
 /*------------------------------------------------------------------.
 | TEXT is pointing to a wannabee semantic value (i.e., a `$').      |
 |                                                                   |

-| Possible inputs: $[<TYPENAME>]($|integer)                         |
+| Possible inputs: $(<TYPENAME>|)($|integer|c_id|[id])              |

 |                                                                   |
 | Output to OBSTACK_FOR_STRING a reference to this semantic value.  |
 `------------------------------------------------------------------*/
 
 static void
 |                                                                   |
 | Output to OBSTACK_FOR_STRING a reference to this semantic value.  |
 `------------------------------------------------------------------*/
 
 static void

-handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
+handle_action_dollar (symbol_list *rule, char *text, unsigned textlen,
+                     location dollar_loc)

 {
   char const *type_name = NULL;
   char *cp = text + 1;
 {
   char const *type_name = NULL;
   char *cp = text + 1;


@@ -735,7 +696,7 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
     }
 
   n = parse_ref (cp, effective_rule, effective_rule_length,
     }
 
   n = parse_ref (cp, effective_rule, effective_rule_length,

-                rule->midrule_parent_rhs_index, text, dollar_loc, '$');
+                rule->midrule_parent_rhs_index, text, textlen, dollar_loc);

 
   if (gt_ptr)
     *gt_ptr = '\0';
 
   if (gt_ptr)
     *gt_ptr = '\0';


@@ -806,10 +767,11 @@ handle_action_dollar (symbol_list *rule, char *text, location dollar_loc)
 `------------------------------------------------------*/
 
 static void
 `------------------------------------------------------*/
 
 static void

-handle_action_at (symbol_list *rule, char *text, location at_loc)
+handle_action_at (symbol_list const *rule, char const *text, unsigned textlen,
+                 location at_loc)

 {
 {

-  char *cp = text + 1;
-  symbol_list *effective_rule;
+  char const *cp = text + 1;
+  symbol_list const *effective_rule;

   int effective_rule_length;
   int n;
 
   int effective_rule_length;
   int n;
 


@@ -827,7 +789,7 @@ handle_action_at (symbol_list *rule, char *text, location at_loc)
   muscle_percent_define_ensure("locations", at_loc, true);
 
   n = parse_ref (cp, effective_rule, effective_rule_length,
   muscle_percent_define_ensure("locations", at_loc, true);
 
   n = parse_ref (cp, effective_rule, effective_rule_length,

-                      rule->midrule_parent_rhs_index, text, at_loc, '@');
+                rule->midrule_parent_rhs_index, text, textlen, at_loc);

   switch (n)
     {
     case INVALID_REF:
   switch (n)
     {
     case INVALID_REF:

diff --git a/src/scan-gram.l b/src/scan-gram.l
index 41291812e82dfed912a7c05a8df9611773c48696..a40aadeaf509406439861a6997fbaecfd4873df6 100644 (file)
--- a/src/scan-gram.l
+++ b/src/scan-gram.l
@@ -118,8 +118,9 @@ static void unexpected_newline (boundary, char const *);
  /* Bracketed identifiers support. */
 %x SC_BRACKETED_ID SC_RETURN_BRACKETED_ID
 
  /* Bracketed identifiers support. */
 %x SC_BRACKETED_ID SC_RETURN_BRACKETED_ID
 

-letter   [.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
-id       -*(-|{letter}({letter}|[-0-9])*)
+/* A Bison identifier.  Keep this synchronized with scan-code.l "id".  */
+letter   [-.abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ_]
+id       {letter}({letter}|[0-9])*

 directive %{id}
 int      [0-9]+
 
 directive %{id}
 int      [0-9]+
 

diff --git a/src/symlist.c b/src/symlist.c
index e717c3e1a4775774aa2e47b4005557ffb1f175c4..5483f0712df43928f91b179874ba13dc4101df12 100644 (file)
--- a/src/symlist.c
+++ b/src/symlist.c
@@ -217,7 +217,7 @@ symbol_list_n_type_name_get (symbol_list *l, location loc, int n)
 }
 
 bool
 }
 
 bool

-symbol_list_null (symbol_list *node)
+symbol_list_null (symbol_list const *node)

 {
   return !node ||
     (node->content_type == SYMLIST_SYMBOL && !(node->content.sym));
 {
   return !node ||
     (node->content_type == SYMLIST_SYMBOL && !(node->content.sym));

diff --git a/src/symlist.h b/src/symlist.h
index 297d414acca46e59b08f82cfd2bd508ca7438852..e5a0714a597b216f130f74c3b0ee7a382d3bf282 100644 (file)
--- a/src/symlist.h
+++ b/src/symlist.h
@@ -116,7 +116,7 @@ symbol_list *symbol_list_n_get (symbol_list *l, int n);
 uniqstr symbol_list_n_type_name_get (symbol_list *l, location loc, int n);
 
 /* Check whether the node is a border element of a rule. */
 uniqstr symbol_list_n_type_name_get (symbol_list *l, location loc, int n);
 
 /* Check whether the node is a border element of a rule. */

-bool symbol_list_null (symbol_list *node);
+bool symbol_list_null (symbol_list const *node);

 
 /** Set the \c \%destructor for \c node as \c code at \c loc.  */
 void symbol_list_destructor_set (symbol_list *node, char const *code,
 
 /** Set the \c \%destructor for \c node as \c code at \c loc.  */
 void symbol_list_destructor_set (symbol_list *node, char const *code,

diff --git a/tests/named-refs.at b/tests/named-refs.at
index 74549c6e78cc8652ce86db5e1b8e17b5df71b49f..17cbef3e53d3e6ecc1295cea4ad9bec87d6e3781 100644 (file)
--- a/tests/named-refs.at
+++ b/tests/named-refs.at
@@ -279,11 +279,9 @@ start: foo foo.bar { $foo.bar; }
 foo: '1'
 foo.bar: '2'
 ]])
 foo: '1'
 foo.bar: '2'
 ]])

-AT_BISON_CHECK([-o test.c test.y], 0, [],
-[[test.y:11.22-29: warning: misleading reference: `$foo.bar'
-test.y:11.8-10:      warning: refers to: $foo at $1
-test.y:11.12-18:     warning: possibly meant: $[foo.bar] at $2
-]])
+AT_BISON_CHECK([-o test.c test.y])
+AT_CHECK([if $CC $CFLAGS $CPPFLAGS test.c; then false; else true; fi],
+         [0], [ignore], [ignore])

 AT_CLEANUP
 
 #######################################################################
 AT_CLEANUP
 
 #######################################################################


@@ -358,43 +356,33 @@ factor:     '(' expr ')'  { $$ = $2; }
 AT_BISON_CHECK([-o test.c test.y], 1, [],
 [[test.y:24.36-41: invalid reference: `$cond1'
 test.y:23.11-24.62:  symbol not found in production: cond1
 AT_BISON_CHECK([-o test.c test.y], 1, [],
 [[test.y:24.36-41: invalid reference: `$cond1'
 test.y:23.11-24.62:  symbol not found in production: cond1

-test.y:26.43-53: invalid reference: `$stmt.field'
+test.y:26.43-47: invalid reference: `$stmt'

 test.y:25.11-26.60:  symbol not found in production: stmt
 test.y:25.11-26.60:  symbol not found in production: stmt

-test.y:25.35-38:     possibly meant: $then.field, hiding $stmt.field at $4
-test.y:28.43-52: invalid reference: `$stmt.list'
+test.y:25.35-38:     possibly meant: $then, hiding $stmt at $4
+test.y:28.43-47: invalid reference: `$stmt'

 test.y:27.11-28.59:  symbol not found in production: stmt
 test.y:27.11-28.59:  symbol not found in production: stmt

-test.y:27.30-38:     possibly meant: $[stmt.list] at $4

 test.y:30.43-46: ambiguous reference: `$xyz'
 test.y:29.35-37:     refers to: $xyz at $4
 test.y:29.50-52:     refers to: $xyz at $6
 test.y:30.43-46: ambiguous reference: `$xyz'
 test.y:29.35-37:     refers to: $xyz at $4
 test.y:29.50-52:     refers to: $xyz at $6

-test.y:32.43-52: invalid reference: `$stmt.list'
+test.y:32.43-47: invalid reference: `$stmt'

 test.y:31.11-32.63:  symbol not found in production: stmt
 test.y:31.11-32.63:  symbol not found in production: stmt

-test.y:31.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
-test.y:31.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
-test.y:34.43-58: invalid reference: `$stmt.list.field'
+test.y:34.43-47: invalid reference: `$stmt'

 test.y:33.11-34.69:  symbol not found in production: stmt
 test.y:33.11-34.69:  symbol not found in production: stmt

-test.y:33.40-43:     possibly meant: $then.field, hiding $[stmt.list].field at $4
-test.y:33.61-64:     possibly meant: $else.field, hiding $[stmt.list].field at $6

 test.y:36.43-54: invalid reference: `$[stmt.list]'
 test.y:35.11-36.71:  symbol not found in production: stmt.list
 test.y:35.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
 test.y:35.61-64:     possibly meant: $else, hiding $[stmt.list] at $6
 test.y:36.43-54: invalid reference: `$[stmt.list]'
 test.y:35.11-36.71:  symbol not found in production: stmt.list
 test.y:35.40-43:     possibly meant: $then, hiding $[stmt.list] at $4
 test.y:35.61-64:     possibly meant: $else, hiding $[stmt.list] at $6

-test.y:38.43-49: invalid reference: `$then.1'
+test.y:38.43-47: invalid reference: `$then'

 test.y:37.11-38.60:  symbol not found in production: then
 test.y:37.11-38.60:  symbol not found in production: then

-test.y:37.40-45:     possibly meant: $[then.1] at $4
-test.y:40.43-55: invalid reference: `$then.1.field'
+test.y:40.43-47: invalid reference: `$then'

 test.y:39.11-40.66:  symbol not found in production: then
 test.y:39.11-40.66:  symbol not found in production: then

-test.y:39.40-45:     possibly meant: $[then.1].field at $4
-test.y:42.44-50: invalid reference: `$stmt.x'
+test.y:42.44-48: invalid reference: `$stmt'

 test.y:41.12-42.57:  symbol not found in production: stmt
 test.y:41.12-42.57:  symbol not found in production: stmt

-test.y:41.36-41:     possibly meant: $[stmt.x].x, hiding $stmt.x at $4
-test.y:41.36-41:     possibly meant: $[stmt.x] at $4
-test.y:44.13-22: invalid reference: `$if-stmt-a'
+test.y:41.36-41:     possibly meant: $[stmt.x], hiding $stmt at $4
+test.y:44.13-15: invalid reference: `$if'

 test.y:43.12-44.59:  symbol not found in production: if
 test.y:43.12-44.59:  symbol not found in production: if

-test.y:43.1-9:       possibly meant: $[if-stmt-a] at $$
-test.y:46.46-54: invalid reference: `$then-a.f'
+test.y:46.46-50: invalid reference: `$then'

 test.y:45.12-46.65:  symbol not found in production: then
 test.y:45.12-46.65:  symbol not found in production: then

-test.y:45.41-46:     possibly meant: $[then-a].f at $4

 ]])
 AT_CLEANUP
 
 ]])
 AT_CLEANUP
 


@@ -527,9 +515,9 @@ sym_a : 'a';
 sym_b : 'b';
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],
 sym_b : 'b';
 ]])
 AT_BISON_CHECK([-o test.c test.y], 1, [],

-[[test.y:13.8-17: invalid reference: `$sym.field'
+[[test.y:13.8-11: invalid reference: `$sym'

 test.y:12.1-13.21:  symbol not found in production: sym
 test.y:12.1-13.21:  symbol not found in production: sym

-test.y:16.8-21: invalid reference: `$<aa>sym.field'
+test.y:16.8-15: invalid reference: `$<aa>sym'

 test.y:15.1-16.25:  symbol not found in production: sym
 test.y:19.8-19: invalid reference: `$[sym.field]'
 test.y:18.1-19.23:  symbol not found in production: sym.field
 test.y:15.1-16.25:  symbol not found in production: sym
 test.y:19.8-19: invalid reference: `$[sym.field]'
 test.y:18.1-19.23:  symbol not found in production: sym.field


@@ -543,9 +531,9 @@ test.y:31.8-13: invalid reference: `$[sym]'
 test.y:30.1-33.21:  symbol not found in production before $3: sym
 test.y:33.8-17: invalid reference: `$<aa>[sym]'
 test.y:30.1-33.21:  symbol not found in production: sym
 test.y:30.1-33.21:  symbol not found in production before $3: sym
 test.y:33.8-17: invalid reference: `$<aa>[sym]'
 test.y:30.1-33.21:  symbol not found in production: sym

-test.y:37.8-17: invalid reference: `$sym-field'
+test.y:37.8-11: invalid reference: `$sym'

 test.y:36.1-37.21:  symbol not found in production: sym
 test.y:36.1-37.21:  symbol not found in production: sym

-test.y:40.8-21: invalid reference: `$<aa>sym-field'
+test.y:40.8-15: invalid reference: `$<aa>sym'

 test.y:39.1-40.25:  symbol not found in production: sym
 test.y:43.8-19: invalid reference: `$[sym-field]'
 test.y:42.1-43.23:  symbol not found in production: sym-field
 test.y:39.1-40.25:  symbol not found in production: sym
 test.y:43.8-19: invalid reference: `$[sym-field]'
 test.y:42.1-43.23:  symbol not found in production: sym-field


@@ -572,21 +560,15 @@ start:
   .field { $.field; }
 | -field { @-field; }
 | 'a'    { @.field; }
   .field { $.field; }
 | -field { @-field; }
 | 'a'    { @.field; }

-| 'a'    { $-field; }
+| 'b'    { $-field; }

 ;
 ;

-.field: ;
--field: ;
+.field: 'c' ;
+-field: 'd' ;

 ]])
 ]])

-AT_BISON_CHECK([[test.y]], [[1]], [],
-[[test.y:4.12-18: invalid reference: `$.field'
-test.y:4.13:        syntax error after `$', expecting integer, letter, `_', `@<:@', or `$'
-test.y:4.3-8:       possibly meant: $[.field] at $1
-test.y:5.12-18: invalid reference: `@-field'
-test.y:5.13:        syntax error after `@', expecting integer, letter, `_', `@<:@', or `$'
-test.y:5.3-8:       possibly meant: @[-field] at $1
-test.y:6.12-18: invalid reference: `@.field'
-test.y:6.13:        syntax error after `@', expecting integer, letter, `_', `@<:@', or `$'
-test.y:7.12-18: invalid reference: `$-field'
-test.y:7.13:        syntax error after `$', expecting integer, letter, `_', `@<:@', or `$'
+AT_BISON_CHECK([[test.y]], [], [],
+[[test.y:4.12: warning: stray `$'
+test.y:5.12: warning: stray `@'
+test.y:6.12: warning: stray `@'
+test.y:7.12: warning: stray `$'

 ]])
 AT_CLEANUP
 ]])
 AT_CLEANUP