(_AT_CHECK_PRINTER_AND_DESTRUCTOR,

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

diff --git a/src/scan-skel.l b/src/scan-skel.l
index 0bb71d196f33fcbbdfc56495244ebe83ed975835..af5226c9dd5b1d552e277a5aea1f2ab0f96c5892 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,6 +1,6 @@
-                                                             /* -*- C -*- */
-/* Scan Bison Skeletons.
-   Copyright (C) 2001  Free Software Foundation, Inc.
+/* Scan Bison Skeletons.                                       -*- C -*-
+
+   Copyright (C) 2001, 2002, 2003 Free Software Foundation, Inc.
 
    This file is part of Bison, the GNU Compiler Compiler.
 
@@ -19,55 +19,80 @@
    Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
    02111-1307, USA.  */
 
+%option nodefault noyywrap nounput never-interactive debug
+%option prefix="skel_" outfile="lex.yy.c"
+
 %{
 #include "system.h"
-#include "skeleton.h"
-#include "parse-skel.h"
-%}
-
-%option nounput
-%option noyywrap
-/* If we enable
 
-   %option yylineno
+#include <error.h>
+#include <quotearg.h>
 
-   Then we have warning: `yy_flex_realloc' defined but not used.
-   Seems like a Flex bug to me: Why the heck yylineno would trigger
-   the REJECT exception???  */
+#include "getargs.h"
+#include "files.h"
 
-%%
+int skel_lex (void);
 
-"%%{line}"          { return LINE; }
-"%%{skeleton-line}" { return SLINE; }
+#define QPUTS(String) \
+   fputs (quotearg_style (c_quoting_style, (String)), yyout)
 
-"%%{yacc}"    { return YACC; }
-"%%{section}" { return SECTION; }
+%}
+%%
 
-"%%{guards}"   { return GUARDS; }
-"%%{actions}"  { return ACTIONS; }
-"%%{tokendef}" { return TOKENS; }
+%{
+  int lineno IF_LINT (= 0);
+  char *outname = NULL;
+%}
 
-  /* Muscle.  */
-"%%{"[a-zA-Z][0-9a-zA-Z_-]+"}" {
-  yylval.muscle = xstrndup (yytext + 3, yyleng - 4);
-  return MUSCLE;
+"@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
+       abort ();
+    }
+
+  XFREE (outname);
+  outname = xstrdup (filename);
+  xfclose (yyout);
+  yyout = xfopen (outname, "w");
+  lineno = 1;
 }
 
-  /* String.  */
-"%%\"".*"\"" {
-  yylval.string = xstrndup (yytext + 3, yyleng - 4);
-  return STRING;
-}
+"@@"      fputc ('@', yyout);
+"@{"      fputc ('[', yyout);
+"@}"      fputc (']', yyout);
 
-  /* End of line.  */
-"\n" {
-  return '\n';
-}
+"@oline@"  fprintf (yyout, "%d", lineno + 1);
+"@ofile@"  QPUTS (outname);
+"@output_parser_name@" QPUTS (parser_file_name);
+"@output_header_name@"  QPUTS (spec_defines_file);
 
-  /* Plain Character.  */
-. {
-  yylval.character = *yytext;
-  return CHARACTER;
-}
+"@"       abort ();
+\n        lineno++; ECHO;
+[^@\n]+           ECHO;
 
+<<EOF>>           xfclose (yyout); free (outname); return EOF;
 %%
+
+/*------------------------.
+| Scan a Bison skeleton.  |
+`------------------------*/
+
+void scan_skel (FILE *);
+
+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);
+}