X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/9b3add5bebc553f9bc1a10a9a6a489135f2a9d4d..01e972b3f529991ad22e68f0f8cc142543ac5d45:/src/scan-skel.l

diff --git a/src/scan-skel.l b/src/scan-skel.l
index b78e02f5..e787d288 100644
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,55 +1,125 @@
+/* Scan Bison Skeletons.                                       -*- C -*-
+
+   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006 Free Software
+   Foundation, Inc.
+
+   This file is part of Bison, the GNU Compiler Compiler.
+
+   Bison is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   Bison is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with Bison; see the file COPYING.  If not, write to the Free
+   Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA.  */
+
+%option nodefault noyywrap nounput never-interactive debug
+%option prefix="skel_" outfile="lex.yy.c"
+
 %{
+/* 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
 
-#include <stdlib.h>
-#include <string.h>
+#define FLEX_NO_OBSTACK
+#define FLEX_PREFIX(Id) skel_ ## Id
+#include "flex-scanner.h"
 
-#include "parse-skel.h"
+#include <dirname.h>
+#include <error.h>
+#include <quotearg.h>
 
-%}
+#include "complain.h"
+#include "getargs.h"
+#include "files.h"
+#include "scan-skel.h"
+
+int skel_lex (void);
+
+#define QPUTS(String) \
+   fputs (quotearg_style (c_quoting_style, String), yyout)
 
-%option nounput
-%option noyywrap
-%option yylineno
+#define BASE_QPUTS(File) \
+   QPUTS (last_component (File))
 
+%}
 %%
 
-"%%{line}"          { return LINE; }
-"%%{skeleton-line}" { return SLINE; }
+%{
+  int lineno IF_LINT (= 0);
+  char *outname = NULL;
+%}
 
-"%%{yacc}"    { return YACC; }
-"%%{section}" { return SECTION; }
+"@output ".*\n {
+  char const *file_name = yytext + sizeof "@output " - 1;
+  yytext[yyleng - 1] = '\0';
 
-"%%{guards}"   { return GUARDS; }
-"%%{actions}"  { return ACTIONS; }
-"%%{tokendef}" { return TOKENS; }
+  /* 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.  */
 
-"%%{"[a-zA-Z][0-9a-zA-Z_-]+"}" { /* Muscle.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return MUSCLE;
+  if (*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 (file_name);
+  yyout = xfopen (outname, "w");
+  lineno = 1;
 }
 
-"%%\"".*"\"" { /* String.  */
-  size_t len = strlen (yytext);
-  yylval.string = (char*) malloc (len - 3);
-  strncpy (yylval.string, yytext + 3, len - 4);
-  yylval.string[len - 4] = 0;
-  return STRING;
-}
+"@@"	   fputc ('@', yyout);
+"@{"	   fputc ('[', yyout);
+"@}"	   fputc (']', yyout);
 
-<<EOF>> { /* End of file.  */
-  return 0;
-}
+"@oline@"  fprintf (yyout, "%d", lineno + 1);
+"@ofile@"  QPUTS (outname);
+"@dir_prefix@" QPUTS (dir_prefix);
+"@output_parser_name@"	BASE_QPUTS (parser_file_name);
+"@output_header_name@"	BASE_QPUTS (spec_defines_file);
 
-"\n" { /* End of line.  */
-  return '\n';
-}
+  /* This pattern must not match more than the previous @ patterns. */
+@[^{}@\n]* fatal ("invalid @ in skeleton: %s", yytext);
+\n	   lineno++; ECHO;
+[^@\n]+	   ECHO;
 
-. { /* Character.  */
-  yylval.character = *yytext;
-  return CHARACTER;
+<<EOF>> {
+  if (outname)
+    {
+      free (outname);
+      xfclose (yyout);
+    }
+  return EOF;
 }
-
 %%
+
+/*------------------------.
+| Scan a Bison skeleton.  |
+`------------------------*/
+
+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);
+}