[PATCH 3/7] skel: better aliasing of identifiers

[Theophile Ranquet]

* data/glr.c, data/yacc.c: Avoid emitting useless defines.
* data/glr.cc: Restore prefixes for epilogue.
---
 data/glr.c  | 22 ++++++++++++++++++++--
 data/glr.cc | 18 ++++++++++++++++++
 data/yacc.c |  9 +++++----
 3 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/data/glr.c b/data/glr.c
index 106b95a..c2dc4c9 100644
--- a/data/glr.c
+++ b/data/glr.c
@@ -196,11 +196,12 @@ b4_percent_code_get([[top]])[
 #define yyparse ]b4_prefix[parse
 #define yylex   ]b4_prefix[lex
 #define yyerror ]b4_prefix[error
+#define yydebug ]b4_prefix[debug
+]]b4_pure_if([], [[
 #define yylval  ]b4_prefix[lval
 #define yychar  ]b4_prefix[char
-#define yydebug ]b4_prefix[debug
 #define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
-#define yylloc  ]b4_prefix[lloc]])])[
+#define yylloc  ]b4_prefix[lloc]])]))[
 
 /* First part of user declarations.  */
 ]b4_user_pre_prologue[
@@ -2543,6 +2544,23 @@ yypdumpstack (yyGLRStack* yystackp)
   YYFPRINTF (stderr, "\n");
 }
 #endif
+
+#undef yylval
+#undef yychar
+#undef yynerrs]b4_locations_if([
+#undef yylloc])
+
+m4_if(b4_prefix, [yy], [],
+[[/* Substitute the variable and function names.  */
+#define yyparse ]b4_prefix[parse
+#define yylex   ]b4_prefix[lex
+#define yyerror ]b4_prefix[error
+#define yylval  ]b4_prefix[lval
+#define yychar  ]b4_prefix[char
+#define yydebug ]b4_prefix[debug
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc  ]b4_prefix[lloc]])])[
+
 ]b4_epilogue[]dnl
 b4_output_end()
 
diff --git a/data/glr.cc b/data/glr.cc
index 0d7e03a..5d8e481 100644
--- a/data/glr.cc
+++ b/data/glr.cc
@@ -128,10 +128,28 @@ m4_defn([b4_initial_action])]))])[
     [[const char* msg], [msg]])])
 
 
+#undef yynerrs
+#undef yychar
+#undef yylval]b4_locations_if([
+#undef yylloc])
+
+m4_if(b4_prefix, [yy], [],
+[[/* Substitute the variable and function names.  */
+#define yyparse ]b4_prefix[parse
+#define yylex   ]b4_prefix[lex
+#define yyerror ]b4_prefix[error
+#define yydebug ]b4_prefix[debug
+]]b4_pure_if([], [[
+#define yylval  ]b4_prefix[lval
+#define yychar  ]b4_prefix[char
+#define yynerrs ]b4_prefix[nerrs]b4_locations_if([[
+#define yylloc  ]b4_prefix[lloc]])]))
+
 # Hijack the epilogue to define implementations (yyerror, parser member
 # functions etc.).
 m4_append([b4_epilogue],
 [b4_syncline(address@hidden@], address@hidden@])[
+
 /*------------------.
 | Report an error.  |
 `------------------*/
diff --git a/data/yacc.c b/data/yacc.c
index 9b227ae..4e59024 100644
--- a/data/yacc.c
+++ b/data/yacc.c
@@ -346,11 +346,12 @@ m4_if(b4_api_prefix, [yy], [],
 #define yypstate        ]b4_prefix[pstate]])[
 #define yylex           ]b4_prefix[lex
 #define yyerror         ]b4_prefix[error
-#define yylval          ]b4_prefix[lval
-#define yychar          ]b4_prefix[char
 #define yydebug         ]b4_prefix[debug
-#define yynerrs         ]b4_prefix[nerrs]b4_locations_if([[
-#define yylloc          ]b4_prefix[lloc]])])[
+#define yynerrs         ]b4_prefix[nerrs
+]]b4_pure_if([], [[
+#define yylval          ]b4_prefix[lval
+#define yychar          ]b4_prefix[char]b4_locations_if([[
+#define yylloc          ]b4_prefix[lloc]])]))[
 
 /* Copy the first part of user declarations.  */
 ]b4_user_pre_prologue[
-- 
1.8.1