Support i18n of the parse error messages.

	* TODO (lalr1.cc/I18n): Remove.
	* data/lalr1.cc (yysyntax_error_): Support the translation of the
	error messages, as done in yacc.c.
	Stay within the yy* pseudo namespace.
(cherry picked from commit a0ffc1751e712e55b27aa7349ec7db302557476b)

Conflicts:

	TODO
	data/lalr1.cc

diff --git a/ChangeLog b/ChangeLog
index 86bc8a0..f4d4806 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2008-11-11  Akim Demaille  <demaille@gostai.com>
+
+       Support i18n of the parse error messages.
+       * TODO (lalr1.cc/I18n): Remove.
+       * data/lalr1.cc (yysyntax_error_): Support the translation of the
+       error messages, as done in yacc.c.
+       Stay within the yy* pseudo namespace.
+
 2009-12-22  Joel E. Denny  <jdenny@clemson.edu>
 
        Port small part of master's 8901f32e so future ports are easier.

diff --git a/TODO b/TODO
index 6686ca4..9184513 100644 (file)
--- a/TODO
+++ b/TODO
@@ -22,9 +22,6 @@ parser") refers to the current `output' format.
 ** vector
 Move to using vector, drop stack.hh.
 
-** I18n
-Catch up with yacc.c.
-
 * Report
 
 **  GLR

diff --git a/data/lalr1.cc b/data/lalr1.cc
index a2d473d..f4cadc0 100644 (file)
--- a/data/lalr1.cc
+++ b/data/lalr1.cc
@@ -850,9 +850,9 @@ m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
   // Generate an error message.
   std::string
   ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl
-b4_error_verbose_if([ tok])[)
+b4_error_verbose_if([ yytoken])[)
   {
-    std::string res;
+    std::string yyres;
     YYUSE (yystate);
 #if YYERROR_VERBOSE
     int yyn = yypact_[yystate];
@@ -866,38 +866,56 @@ b4_error_verbose_if([ tok])[)
        /* Stay within bounds of both yycheck and yytname.  */
        int yychecklim = yylast_ - yyn + 1;
        int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
-       int count = 0;
-       for (int x = yyxbegin; x < yyxend; ++x)
-         if (yycheck_[x + yyn] == x && x != yyterror_
-             && !yy_table_value_is_error_ (yytable_[x + yyn]))
-           ++count;
-
-       // FIXME: This method of building the message is not compatible
-       // with internationalization.  It should work like yacc.c does it.
-       // That is, first build a string that looks like this:
-       // "syntax error, unexpected %s or %s or %s"
-       // Then, invoke YY_ on this string.
-       // Finally, use the string as a format to output
-       // yytname_[tok], etc.
-       // Until this gets fixed, this message appears in English only.
-       res = "syntax error, unexpected ";
-       res += yytnamerr_ (yytname_[tok]);
-       if (count < 5)
-         {
-           count = 0;
-           for (int x = yyxbegin; x < yyxend; ++x)
-             if (yycheck_[x + yyn] == x && x != yyterror_
-                 && !yy_table_value_is_error_ (yytable_[x + yyn]))
-               {
-                 res += (!count++) ? ", expecting " : " or ";
-                 res += yytnamerr_ (yytname_[x]);
-               }
-         }
+
+        // Number of "expected" tokens.
+       size_t yycount = 0;
+        // Its maximum.
+        enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
+        // Arguments of yyformat.
+        char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
+        yyarg[yycount++] = yytname_[yytoken];
+       for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
+         if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_
+             && !yy_table_value_is_error_ (yytable_[yyx + yyn]))
+          {
+            if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
+            {
+              yycount = 1;
+              break;
+            }
+            else
+              yyarg[yycount++] = yytname_[yyx];
+          }
+
+        char const* yyformat = 0;
+        switch (yycount)
+        {
+#define YYCASE_(N, S)                           \
+          case N:                               \
+            yyformat = S;                       \
+          break
+          YYCASE_(1, YY_("syntax error, unexpected %s"));
+          YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
+          YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+          YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+          YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+#undef YYCASE_
+        }
+        // Argument number.
+        size_t yyi = 0;
+        for (char const* yyp = yyformat; *yyp; ++yyp)
+          if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
+          {
+            yyres += yytnamerr_ (yyarg[yyi++]);
+            ++yyp;
+          }
+          else
+            yyres += *yyp;
       }
     else
 #endif
-      res = YY_("syntax error");
-    return res;
+      yyres = YY_("syntax error");
+    return yyres;
   }