java: add support for parse.error=detailed

In Java there is no need for N_ and yytranslate_.  So instead of
hard-coding the use of N_ in the table of the symbol names, rely on
b4_symbol_translate.

* src/output.c (prepare_symbol_names): Use b4_symbol_translate instead
of N_.
* data/skeletons/c.m4 (b4_symbol_translate): New.
* data/skeletons/lalr1.java (yysymbolName): New.
Use it.
* examples/java/calc/Calc.y: Use parse.error=detailed.
* tests/calc.at: Check parse.error=detailed.

data/skeletons/c.m4

@@ -470,6 +470,13 @@ m4_define([b4_token_enums_defines],
 [b4_token_enums[]b4_yacc_if([b4_token_defines])])
 
 
+# b4_symbol_translate(STRING)
+# ---------------------------
+m4_define([b4_symbol_translate],
+[[N_($1)]])
+
+
+
 ## ----------------- ##
 ## Semantic Values.  ##
 ## ----------------- ##

data/skeletons/java.m4

@@ -220,6 +220,13 @@ m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
 ## ----------------- ##
 
 
+# b4_symbol_translate(STRING)
+# ---------------------------
+m4_define([b4_symbol_translate],
+[[_($1)]])
+
+
+
 # b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
 # ----------------------------------------------
 # See README.

data/skeletons/lalr1.java

@@ -488,42 +488,6 @@ m4_define([b4_define_state],[[
     return YYNEWSTATE;
   }
 
-]b4_error_verbose_if([[
-  /* Return YYSTR after stripping away unnecessary quotes and
-     backslashes, so that it's suitable for yyerror.  The heuristic is
-     that double-quoting is unnecessary unless the string contains an
-     apostrophe, a comma, or backslash (other than backslash-backslash).
-     YYSTR is taken from yytname.  */
-  private final String yytnamerr_ (String yystr)
-  {
-    if (yystr.charAt (0) == '"')
-      {
-        StringBuffer yyr = new StringBuffer ();
-        strip_quotes: for (int i = 1; i < yystr.length (); i++)
-          switch (yystr.charAt (i))
-            {
-            case '\'':
-            case ',':
-              break strip_quotes;
-
-            case '\\':
-              if (yystr.charAt(++i) != '\\')
-                break strip_quotes;
-              /* Fall through.  */
-            default:
-              yyr.append (yystr.charAt (i));
-              break;
-
-            case '"':
-              return yyr.toString ();
-            }
-      }
-    else if (yystr.equals ("$end"))
-      return "end of input";
-
-    return yystr;
-  }
-]])[
 ]b4_parse_trace_if([[
   /*--------------------------------.
   | Print this symbol on YYOUTPUT.  |
@@ -534,7 +498,7 @@ m4_define([b4_define_state],[[
                               b4_locations_if([, Object yylocationp])[)
   {
     yycdebug (s + (yytype < yyntokens_ ? " token " : " nterm ")
-              + yytname_[yytype] + " ("]b4_locations_if([
+              + yysymbolName (yytype) + " ("]b4_locations_if([
               + yylocationp + ": "])[
               + (yyvaluep == null ? "(null)" : yyvaluep.toString ()) + ")");
   }]])[
@@ -924,7 +888,7 @@ b4_dollar_popdef[]dnl
                with internationalization.  */
             StringBuffer res =
               new StringBuffer ("syntax error, unexpected ");
-            res.append (yytnamerr_ (yytname_[tok]));
+            res.append (yysymbolName (tok));
             int yyn = yypact_[yystate];
             if (!yyPactValueIsDefault (yyn))
               {
@@ -949,7 +913,7 @@ b4_dollar_popdef[]dnl
                           && !yyTableValueIsError (yytable_[x + yyn]))
                         {
                           res.append (count++ == 0 ? ", expecting " : " or ");
-                          res.append (yytnamerr_ (yytname_[x]));
+                          res.append (yysymbolName (x));
                         }
                   }
               }
@@ -984,10 +948,64 @@ b4_dollar_popdef[]dnl
 
 ]b4_parser_tables_define[
 
+]m4_bmatch(b4_percent_define_get([[parse.error]]),
+           [simple\|verbose],
+[[  /* Return YYSTR after stripping away unnecessary quotes and
+     backslashes, so that it's suitable for yyerror.  The heuristic is
+     that double-quoting is unnecessary unless the string contains an
+     apostrophe, a comma, or backslash (other than backslash-backslash).
+     YYSTR is taken from yytname.  */
+  private static String yytnamerr_ (String yystr)
+  {
+    if (yystr.charAt (0) == '"')
+      {
+        StringBuffer yyr = new StringBuffer ();
+        strip_quotes: for (int i = 1; i < yystr.length (); i++)
+          switch (yystr.charAt (i))
+            {
+            case '\'':
+            case ',':
+              break strip_quotes;
+
+            case '\\':
+              if (yystr.charAt(++i) != '\\')
+                break strip_quotes;
+              /* Fall through.  */
+            default:
+              yyr.append (yystr.charAt (i));
+              break;
+
+            case '"':
+              return yyr.toString ();
+            }
+      }
+    else if (yystr.equals ("$end"))
+      return "end of input";
+
+    return yystr;
+  }
+
   /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
      First, the terminals, then, starting at \a yyntokens_, nonterminals.  */
   ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
 
+  static String yysymbolName (int yysymbol)
+  {
+    return yytnamerr_ (yytname_[yysymbol]);
+  }
+]],
+        [custom\|detailed],
+[[/* The user-facing name of the symbol whose (internal) number is
+   YYSYMBOL.  No bounds checking.  */
+static String yysymbolName (int yysymbol)
+{
+  String[] yy_sname =
+  {
+  ]b4_symbol_names[
+  };
+  return yy_sname[yysymbol];
+}]])[
+
 ]b4_parse_trace_if([[
   ]b4_integral_parser_table_define([rline], [b4_rline],
   [[YYRLINE[YYN] -- Source line where rule number YYN was defined.]])[

examples/java/calc/Calc.y

@@ -3,7 +3,7 @@
 %define api.parser.class {Calc}
 %define api.parser.public
 
-%define parse.error verbose
+%define parse.error detailed
 %define parse.trace
 
 %locations

src/output.c

@@ -200,8 +200,8 @@ prepare_symbol_names (char const *muscle_name)
   set_quoting_flags (qo, QA_SPLIT_TRIGRAPHS);
   for (int i = 0; i < nsyms; i++)
     {
-      char *cp =
+      char *cp
-        symbols[i]->tag[0] == '"' && !quote
+        = symbols[i]->tag[0] == '"' && !quote
         ? xescape_trigraphs (symbols[i]->tag)
         : quotearg_alloc (symbols[i]->tag, -1, qo);
       /* Width of the next token, including the two quotes, the
@@ -219,10 +219,10 @@ prepare_symbol_names (char const *muscle_name)
       if (i)
         obstack_1grow (&format_obstack, ' ');
       if (!quote && symbols[i]->translatable)
-        obstack_sgrow (&format_obstack, "N_(");
+        obstack_sgrow (&format_obstack, "]b4_symbol_translate([");
       obstack_escape (&format_obstack, cp);
       if (!quote && symbols[i]->translatable)
-        obstack_1grow (&format_obstack, ')');
+        obstack_sgrow (&format_obstack, "])[");
       free (cp);
       obstack_1grow (&format_obstack, ',');
       j += width;

tests/calc.at

@@ -509,7 +509,6 @@ void location_print (FILE *o, Span s);
     const char *
     _ (const char *cp)
     {
-      /* Make sure only "end of input" is translated.  */
       if (strcmp (cp, "end of input") == 0)
         return "end of file";
       else if (strcmp (cp, "number") == 0)
@@ -649,10 +648,23 @@ m4_define([_AT_DATA_CALC_Y(java)],
 }
 
 %code {
-]AT_CALC_MAIN[
+  ]AT_CALC_MAIN[
+
+  ]AT_TOKEN_TRANSLATE_IF([[
+    static String _ (String s)
+    {
+      if (s.equals ("end of input"))
+        return "end of file";
+      else if (s.equals ("number"))
+        return "nombre";
+      else
+        return s;
+    }
+  ]])[
 }
 
 /* Bison Declarations */
+%token CALC_EOF 0 ]AT_TOKEN_TRANSLATE_IF([_("end of input")], ["end of input"])[
 %token <Integer> NUM "number"
 %type  <Integer> exp
 
@@ -1173,6 +1185,7 @@ m4_define([AT_CHECK_CALC_LALR1_JAVA],
 [AT_CHECK_CALC([%language "Java" $1], [$2])])
 
 AT_CHECK_CALC_LALR1_JAVA
+AT_CHECK_CALC_LALR1_JAVA([%define parse.error detailed])
 AT_CHECK_CALC_LALR1_JAVA([%define parse.error verbose])
 AT_CHECK_CALC_LALR1_JAVA([%locations %define parse.error verbose])
 AT_CHECK_CALC_LALR1_JAVA([%define parse.trace %define parse.error verbose])