java: move away from _ for internationalization

The "_" is becoming a keyword in Java, which causes tons of warnings
currently in our test suite.  GNU Gettext is now using "i18n" instead
of "_"
(https://git.savannah.gnu.org/gitweb/?p=gettext.git;a=commitdiff;h=e89fea36545f27487d9652a13e6a0adbea1117d0).

* data/skeletons/java.m4: Use "i18n", not "_".
* examples/java/calc/Calc.y, tests/calc.at: Adjust.

TODO

@@ -3,6 +3,7 @@
 - yyexpected_tokens in all the languages.
 - remove yysyntax_error_arguments.
 - YYNOMEM
+- i18n in Java
 
 ** Naming conventions
 yysyntax_error_arguments should be yy_syntax_error_arguments, since it's a

data/skeletons/c.m4

@@ -479,6 +479,8 @@ m4_define([b4_token_enums_defines],
 
 # b4_symbol_translate(STRING)
 # ---------------------------
+# Used by "bison" in the array of symbol names to mark those that
+# require translation.
 m4_define([b4_symbol_translate],
 [[N_($1)]])
 

data/skeletons/java.m4

@@ -229,15 +229,17 @@ m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
 
 # b4_symbol_translate(STRING)
 # ---------------------------
+# Used by "bison" in the array of symbol names to mark those that
+# require translation.
 m4_define([b4_symbol_translate],
-[[_($1)]])
+[[i18n($1)]])
 
 
 # b4_trans(STRING)
 # ----------------
-# Translate a symbol.  Avoid collision with b4_translate.
+# Translate a string if i18n is enabled.  Avoid collision with b4_translate.
 m4_define([b4_trans],
-[m4_if(b4_has_translations, 0, [$1], [_($1)])])
+[m4_if(b4_has_translations, 0, [$1], [i18n($1)])])
 
 
 

examples/java/calc/Calc.y

@@ -30,7 +30,7 @@
       System.exit (1);
   }
 
-  static String _ (String s)
+  static String i18n(String s)
   {
     return s;
   }
@@ -39,7 +39,8 @@
 /* Bison Declarations */
 %token
     '\n'   _("end of line")
-  <Integer> NUM _("number")
+  <Integer>
+    NUM    _("number")
 %type  <Integer> exp
 
 %nonassoc '='       /* comparison            */

tests/calc.at

@@ -669,7 +669,7 @@ m4_define([_AT_DATA_CALC_Y(java)],
   ]AT_CALC_MAIN[
 
   ]AT_TOKEN_TRANSLATE_IF([[
-    static String _ (String s)
+    static String i18n(String s)
     {
       if (s.equals ("end of input"))
         return "end of file";