[PATCH 4/7] java: make the syntax error format string translatable

[Akim Demaille]

The error format should be translated, but contrary to the case of
C/C++, we cannot just depend on macros to adapt on the
presence/absence of '_'.  Let's consider that the message format is to
be translated iff there are some internationalized tokens.

* src/output.c (prepare_symbol_names): Define b4_has_translations.
* data/skeletons/java.m4 (b4_trans): New.
* data/skeletons/lalr1.java: Use it to emit translatable or not the
format string.
---
 data/skeletons/java.m4    |  7 +++++++
 data/skeletons/lalr1.java | 16 ++++++++--------
 src/output.c              | 10 +++++++++-
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/data/skeletons/java.m4 b/data/skeletons/java.m4
index 5c015640..920f34bc 100644
--- a/data/skeletons/java.m4
+++ b/data/skeletons/java.m4
@@ -226,6 +226,13 @@ m4_define([b4_symbol_translate],
 [[_($1)]])
 
 
+# b4_trans(STRING)
+# ----------------
+# Translate a symbol.  Avoid collision with b4_translate.
+m4_define([b4_trans],
+[m4_if(b4_has_translations, 0, [$1], [_($1)])])
+
+
 
 # b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
 # ----------------------------------------------
diff --git a/data/skeletons/lalr1.java b/data/skeletons/lalr1.java
index f74ac646..a85f38b0 100644
--- a/data/skeletons/lalr1.java
+++ b/data/skeletons/lalr1.java
@@ -945,18 +945,18 @@ b4_dollar_popdef[]dnl
         String[] yystr = new String[yycount];
         for (int yyi = 0; yyi < yycount; ++yyi)
           yystr[yyi] = yysymbolName (yyarg[yyi]);
-        MessageFormat yyformat;
+        String yyformat;
         switch (yycount)
           {
             default:
-            case 0: yyformat = new MessageFormat ("syntax error"); break;
-            case 1: yyformat = new MessageFormat ("syntax error, unexpected 
{0}"); break;
-            case 2: yyformat = new MessageFormat ("syntax error, unexpected 
{0}, expecting {1}"); break;
-            case 3: yyformat = new MessageFormat ("syntax error, unexpected 
{0}, expecting {1} or {2}"); break;
-            case 4: yyformat = new MessageFormat ("syntax error, unexpected 
{0}, expecting {1} or {2} or {3}"); break;
-            case 5: yyformat = new MessageFormat ("syntax error, unexpected 
{0}, expecting {1} or {2} or {3} or {4}"); break;
+            case 0: yyformat = ]b4_trans(["syntax error"])[; break;
+            case 1: yyformat = ]b4_trans(["syntax error, unexpected {0}"])[; 
break;
+            case 2: yyformat = ]b4_trans(["syntax error, unexpected {0}, 
expecting {1}"])[; break;
+            case 3: yyformat = ]b4_trans(["syntax error, unexpected {0}, 
expecting {1} or {2}"])[; break;
+            case 4: yyformat = ]b4_trans(["syntax error, unexpected {0}, 
expecting {1} or {2} or {3}"])[; break;
+            case 5: yyformat = ]b4_trans(["syntax error, unexpected {0}, 
expecting {1} or {2} or {3} or {4}"])[; break;
           }
-        return yyformat.format (yystr);
+        return new MessageFormat (yyformat).format (yystr);
       }
 ]])[
     return "syntax error";
diff --git a/src/output.c b/src/output.c
index ac143fa0..459023c2 100644
--- a/src/output.c
+++ b/src/output.c
@@ -194,6 +194,7 @@ prepare_symbol_names (char const *muscle_name)
 {
   /* We assume that the table will be output starting at column 2. */
   const bool quote = STREQ (muscle_name, "tname");
+  bool has_translations = false;
   int j = 2;
   struct quoting_options *qo = clone_quoting_options (0);
   set_quoting_style (qo, c_quoting_style);
@@ -219,7 +220,10 @@ prepare_symbol_names (char const *muscle_name)
       if (i)
         obstack_1grow (&format_obstack, ' ');
       if (!quote && symbols[i]->translatable)
-        obstack_sgrow (&format_obstack, "]b4_symbol_translate([");
+        {
+          has_translations = true;
+          obstack_sgrow (&format_obstack, "]b4_symbol_translate([");
+        }
       obstack_escape (&format_obstack, cp);
       if (!quote && symbols[i]->translatable)
         obstack_sgrow (&format_obstack, "])[");
@@ -232,6 +236,10 @@ prepare_symbol_names (char const *muscle_name)
 
   /* Finish table and store. */
   muscle_insert (muscle_name, obstack_finish0 (&format_obstack));
+
+  /* Announce whether translation support is needed.  */
+  if (!quote)
+    MUSCLE_INSERT_BOOL ("has_translations", has_translations);
 }
 
 
-- 
2.25.0