Warn about output files that are generated by the skeletons and that

[bison.git] / src / scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index c08c330ab0ee36d260a42ce1afdb224145384fa6..b466174314dd5f422656943417085f052d8c0d76 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,6 +1,7 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
 
-   Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
+   Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -23,8 +24,16 @@
 %option prefix="skel_" outfile="lex.yy.c"
 
 %{
-#include "system.h"
+/* Work around a bug in flex 2.5.31.  See Debian bug 333231
+   <http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>.  */
+#undef skel_wrap
+#define skel_wrap() 1
 
+#define FLEX_NO_OBSTACK
+#define FLEX_PREFIX(Id) skel_ ## Id
+#include "flex-scanner.h"
+
+#include <dirname.h>
 #include <error.h>
 #include <quotearg.h>
 
@@ -33,8 +42,13 @@
 #include "files.h"
 #include "scan-skel.h"
 
+int skel_lex (void);
+
 #define QPUTS(String) \
-   fputs (quotearg_style (c_quoting_style, (String)), yyout)
+   fputs (quotearg_style (c_quoting_style, String), yyout)
+
+#define BASE_QPUTS(File) \
+   QPUTS (last_component (File))
 
 %}
 %%
@@ -45,25 +59,29 @@
 %}
 
 "@output ".*\n {
-  char const *filename = yytext + sizeof "@output " - 1;
+  char const *file_name = yytext + sizeof "@output " - 1;
   yytext[yyleng - 1] = '\0';
 
-  if (*filename == '@')
+  /* Decode special file names.  They include the directory part,
+     contrary to their "free" occurrences, used for issuing #includes,
+     which must not include the directory part.  */
+
+  if (*file_name == '@')
     {
-      if (strcmp (filename, "@output_header_name@") == 0)
-       filename = spec_defines_file;
-      else if (strcmp (filename, "@output_parser_name@") == 0)
-       filename = parser_file_name;
+      if (strcmp (file_name, "@output_header_name@") == 0)
+       file_name = spec_defines_file;
+      else if (strcmp (file_name, "@output_parser_name@") == 0)
+       file_name = parser_file_name;
       else
        fatal ("invalid token in skeleton: %s", yytext);
     }
-
   if (outname)
     {
       free (outname);
       xfclose (yyout);
     }
-  outname = xstrdup (filename);
+  outname = xstrdup (file_name);
+  output_file_name_check (file_name);
   yyout = xfopen (outname, "w");
   lineno = 1;
 }
@@ -74,8 +92,9 @@
 
 "@oline@"  fprintf (yyout, "%d", lineno + 1);
 "@ofile@"  QPUTS (outname);
-"@output_parser_name@" QPUTS (parser_file_name);
-"@output_header_name@" QPUTS (spec_defines_file);
+"@dir_prefix@" QPUTS (dir_prefix);
+"@output_parser_name@" BASE_QPUTS (parser_file_name);
+"@output_header_name@" BASE_QPUTS (spec_defines_file);
 
   /* This pattern must not match more than the previous @ patterns. */
 @[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
@@ -103,5 +122,5 @@ scan_skel (FILE *in)
   skel__flex_debug = trace_flag & trace_skeleton;
   skel_lex ();
   /* Reclaim Flex's buffers.  */
-  yy_delete_buffer (YY_CURRENT_BUFFER);
+  yylex_destroy ();
 }