X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/6e40b4ebd43da977e1399f3b4678f8346d8e3f2c..e342c3beaf9d73616e8ff6fe005b97f3a72c0476:/src/scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index aa71ac8c..47b696da 100644
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,5 +1,6 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
-   Copyright (C) 2001, 2002  Free Software Foundation, Inc.
+
+   Copyright (C) 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -18,42 +19,67 @@
    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
    02111-1307, USA.  */
 
-%option nodefault noyywrap nounput never-interactive
+%option nodefault noyywrap nounput never-interactive debug
 %option prefix="skel_" outfile="lex.yy.c"
 
 %{
 #include "system.h"
-#include "quotearg.h"
-#include "error.h"
+
+#include <error.h>
+#include <quotearg.h>
+
 #include "getargs.h"
 #include "files.h"
 
 int skel_lex (void);
 
-static int yylineno = 1;
-static char *yyoutname = NULL;
+#define QPUTS(String) \
+   fputs (quotearg_style (c_quoting_style, (String)), yyout)
 
 %}
 %%
-  /* This is an approximation, but we don't need more. */
-^"#output \""[^\"]+\"\n        {
-     yytext[yyleng - 2] = '\0';
-     XFREE (yyoutname);
-     yyoutname = xstrdup (yytext + strlen ("#output \""));
-     yyout = xfopen (yyoutname, "w");
-     yylineno = 1;
-   }
-
-"@<:@"           fputc ('[', yyout);
-"@:>@"           fputc (']', yyout);
-
-"__oline__"      fprintf (yyout, "%d", yylineno+1);
-"__ofile__"      fprintf (yyout, "%s", quotearg_style (escape_quoting_style, yyoutname));
-[^@_\n]+         ECHO;
-\n+              yylineno += yyleng; ECHO;
-.                ECHO;
-
-<<EOF>>          xfclose (yyout); free (yyoutname); return EOF;
+
+%{
+  int lineno IF_LINT (= 0);
+  char *outname = NULL;
+%}
+
+"@output ".*\n {
+  char const *filename = yytext + sizeof "@output " - 1;
+  yytext[yyleng - 1] = '\0';
+
+  if (*filename == '@')
+    {
+      if (strcmp (filename, "@output_header_name@") == 0)
+	filename = spec_defines_file;
+      else if (strcmp (filename, "@output_parser_name@") == 0)
+	filename = parser_file_name;
+      else
+	fatal ("invalid token in skeleton: %s", yytext);
+    }
+
+  XFREE (outname);
+  outname = xstrdup (filename);
+  xfclose (yyout);
+  yyout = xfopen (outname, "w");
+  lineno = 1;
+}
+
+"@@"	   fputc ('@', yyout);
+"@{"	   fputc ('[', yyout);
+"@}"	   fputc (']', yyout);
+
+"@oline@"  fprintf (yyout, "%d", lineno + 1);
+"@ofile@"  QPUTS (outname);
+"@output_parser_name@"	QPUTS (parser_file_name);
+"@output_header_name@"  QPUTS (spec_defines_file);
+
+  /* This pattern must not match more than the previous @ patterns. */
+@[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
+\n	   lineno++; ECHO;
+[^@\n]+	   ECHO;
+
+<<EOF>>	   xfclose (yyout); free (outname); return EOF;
 %%
 
 /*------------------------.
@@ -66,8 +92,8 @@ void
 scan_skel (FILE *in)
 {
   skel_in = in;
+  skel__flex_debug = trace_flag & trace_skeleton;
   skel_lex ();
-
   /* Reclaim Flex's buffers.  */
   yy_delete_buffer (YY_CURRENT_BUFFER);
 }