[PATCH 7/7] lalr1.cc: avoid using yysyntax_error_arguments

[Akim Demaille]

* data/skeletons/lalr1.cc (context::token): New.
* tests/local.at (yyreport_syntax_error): Don't use
yysyntax_error_arguments.
---
 data/skeletons/lalr1.cc |  3 ++-
 tests/local.at          | 33 ++++++++++++++++++---------------
 2 files changed, 20 insertions(+), 16 deletions(-)

diff --git a/data/skeletons/lalr1.cc b/data/skeletons/lalr1.cc
index e35b21c5..75252f6f 100644
--- a/data/skeletons/lalr1.cc
+++ b/data/skeletons/lalr1.cc
@@ -239,7 +239,8 @@ m4_define([b4_shared_declarations],
     class context
     {
     public:
-      context (const ]b4_parser_class[& yyparser, const symbol_type& 
yyla);]b4_locations_if([[
+      context (const ]b4_parser_class[& yyparser, const symbol_type& yyla);
+      int token () const { return yyla_.type_get (); }]b4_locations_if([[
       const location_type& location () const { return yyla_.location; }
 ]])[
       /// Put in YYARG at most YYARGN of the expected tokens, and return the
diff --git a/tests/local.at b/tests/local.at
index 42de48c6..5cc51e7e 100644
--- a/tests/local.at
+++ b/tests/local.at
@@ -741,33 +741,36 @@ void
 }]AT_ERROR_CUSTOM_IF([[
 void
 ]AT_NAMESPACE[::parser::yyreport_syntax_error (const context& ctx) const
-{
-  /* Arguments of yyformat: reported tokens (one for the "unexpected",
-     one per "expected"). */
-  int arg[yyntokens_];
-  int n = ctx.yysyntax_error_arguments (arg, 
yyntokens_);]AT_PARAM_IF([m4_bpatsubst(m4_defn([AT_PARSE_PARAMS]),
+{]AT_PARAM_IF([m4_bpatsubst(m4_defn([AT_PARSE_PARAMS]),
               [[^,]+[^A-Za-z_0-9]\([A-Za-z_][A-Za-z_0-9]*\),* *], [
   YYUSE (\1);])])[]m4_bmatch(m4_defn([AT_PARSE_PARAMS]), [nerrs],[[
   ++global_nerrs;
-  ++*nerrs;]])[
-  if (n)
-  {]AT_LOCATION_IF([[
-    std::cerr << ctx.location () << ": ";]])[
-    std::cerr << "syntax error on token [" << yysymbol_name (arg[0]) << ']';
-    if (1 < n)
+  ++*nerrs;]])[]AT_LOCATION_IF([[
+  std::cerr << ctx.location () << ": ";]])[
+  std::cerr << "syntax error";
+  {
+    int la = ctx.token ();
+    if (la != empty_symbol)
+      fprintf (stderr, " on token [%s]", yysymbol_name (la));
+  }
+  {
+    enum { TOKENMAX = 10 };
+    int expected[TOKENMAX];
+    int n = ctx.yyexpected_tokens (expected, TOKENMAX);
+    if (0 < n)
       {
         std::cerr << " (expected:";
-        for (int i = 1; i < n; ++i)
-          std::cerr << " [" << yysymbol_name (arg[i]) << ']';
+        for (int i = 0; i < n; ++i)
+          std::cerr << " [" << yysymbol_name (expected[i]) << ']';
         std::cerr << ')';
       }
-    std::cerr << '\n';
   }
+  std::cerr << '\n';
 }]])])
 
 
 # AT_YYLEX_DEFINE(c++)([INPUT], [ACTION])
-# -----------------------------------------
+# ---------------------------------------
 # Same as in C.
 m4_copy([AT_YYLEX_DEFINE(c)], [AT_YYLEX_DEFINE(c++)])
 
-- 
2.25.1