build: use gnulib's non-recursive-gnulib-prefix-hack

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

diff --git a/src/scan-skel.l b/src/scan-skel.l
index 3f98cf7dd59946aaeab2715933bd726f1d05d047..607dc3c4f78a81c5a2c798a21d695e19dab9c2cb 100644 (file)
--- a/src/scan-skel.l
+++ b/src/scan-skel.l
@@ -1,69 +1,244 @@
 /* Scan Bison Skeletons.                                       -*- C -*-
 /* Scan Bison Skeletons.                                       -*- C -*-

-   Copyright (C) 2001, 2002  Free Software Foundation, Inc.
+
+   Copyright (C) 2001-2012 Free Software Foundation, Inc.

 
    This file is part of Bison, the GNU Compiler Compiler.
 
 
    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.
+   This program 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 3 of the License, 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.
+   This program 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
 
    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., 59 Temple Place - Suite 330, Boston, MA
-   02111-1307, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

 
 

-%option nodefault noyywrap nounput never-interactive
+%option nodefault noyywrap noinput nounput never-interactive debug

 %option prefix="skel_" outfile="lex.yy.c"
 
 %{
 %option prefix="skel_" outfile="lex.yy.c"
 
 %{

-#include "system.h"
-#include "error.h"
-#include "getargs.h"
-#include "files.h"
-int skel_lex PARAMS ((void));
-static int yylineno = 1;
-static char *yyoutname = NULL;
+/* 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_PREFIX(Id) skel_ ## Id
+#include <src/flex-scanner.h>
+
+#include <dirname.h>
+#include <error.h>
+#include <quotearg.h>
+
+#include <src/complain.h>
+#include <src/getargs.h>
+#include <src/files.h>
+#include <src/scan-skel.h>
+
+#define YY_DECL static int skel_lex (void)
+YY_DECL;
+
+static void at_directive_perform (int argc, char *argv[],
+                                  char **outnamep, int *out_linenop);
+static void fail_for_at_directive_too_many_args (char const *at_directive_name);
+static void fail_for_at_directive_too_few_args (char const *at_directive_name);
+static void fail_for_invalid_at (char const *at);

 %}
 %}

+
+%x SC_AT_DIRECTIVE_ARGS
+%x SC_AT_DIRECTIVE_SKIP_WS
+

 %%
 %%

-  /* 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", yyoutname);
-[^@_\n]+         ECHO;
-\n+              yylineno += yyleng; ECHO;
-.                ECHO;
-
-<<EOF>>          xfclose (yyout); free (yyoutname); return EOF;
+
+%{
+  int out_lineno PACIFY_CC (= 0);
+  char *outname = NULL;
+
+  /* Currently, only the @warn, @complain, @fatal, @warn_at, @complain_at, and
+     @fatal_at directives take multiple arguments, and the last three already
+     can't take more than 7.  argv[0] is the directive name.  */
+  #define ARGC_MAX 8
+  int argc = 0;
+  char *argv[ARGC_MAX];
+%}
+
+"@@" fputc ('@', yyout);
+"@{" fputc ('[', yyout);
+"@}" fputc (']', yyout);
+"@`" continue;  /* Used by b4_cat in ../data/bison.m4.  */
+@\n  continue;
+
+"@oline@"  fprintf (yyout, "%d", out_lineno + 1);
+"@ofile@"  fputs (quotearg_style (c_quoting_style, outname), yyout);
+
+@[a-z_]+"(" {
+  yytext[yyleng-1] = '\0';
+  obstack_grow (&obstack_for_string, yytext, yyleng);
+  argv[argc++] = obstack_finish (&obstack_for_string);
+  BEGIN SC_AT_DIRECTIVE_ARGS;
+}
+
+  /* This pattern must not match more than the previous @ patterns. */
+@[^@{}`(\n]* fail_for_invalid_at (yytext);
+\n         out_lineno++; ECHO;
+[^@\n]+    ECHO;
+
+<INITIAL><<EOF>> {
+  if (outname)
+    {
+      free (outname);
+      xfclose (yyout);
+    }
+  return EOF;
+}
+
+<SC_AT_DIRECTIVE_ARGS>
+{
+  [^@]+  STRING_GROW;
+
+  "@@"   obstack_1grow (&obstack_for_string, '@');
+  "@{"   obstack_1grow (&obstack_for_string, '[');
+  "@}"   obstack_1grow (&obstack_for_string, ']');
+  "@`"   continue; /* For starting an argument that begins with whitespace. */
+  @\n    continue;
+
+  @[,)] {
+    if (argc >= ARGC_MAX)
+      fail_for_at_directive_too_many_args (argv[0]);
+
+    argv[argc++] = obstack_finish0 (&obstack_for_string);
+
+    /* Like M4, skip whitespace after a comma.  */
+    if (yytext[1] == ',')
+      BEGIN SC_AT_DIRECTIVE_SKIP_WS;
+    else
+      {
+        at_directive_perform (argc, argv, &outname, &out_lineno);
+        obstack_free (&obstack_for_string, argv[0]);
+        argc = 0;
+        BEGIN INITIAL;
+      }
+  }
+
+  @.?  fail_for_invalid_at (yytext);
+}
+
+<SC_AT_DIRECTIVE_SKIP_WS>
+{
+  [ \t\r\n]    continue;
+  .            yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS;
+}
+
+<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>
+{
+  <<EOF>>  complain (NULL, fatal, _("unclosed %s directive in skeleton"), argv[0]);
+}
+

 %%
 
 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/
 
 %%
 
 /*------------------------.
 | Scan a Bison skeleton.  |
 `------------------------*/
 

-void scan_skel (FILE *);
-

 void
 scan_skel (FILE *in)
 {
 void
 scan_skel (FILE *in)
 {

+  static bool initialized = false;
+  if (!initialized)
+    {
+      initialized = true;
+      obstack_init (&obstack_for_string);
+    }

   skel_in = in;
   skel_in = in;

+  skel__flex_debug = trace_flag & trace_skeleton;

   skel_lex ();
   skel_lex ();

+}

 
 

+void
+skel_scanner_free (void)
+{
+  obstack_free (&obstack_for_string, 0);

   /* Reclaim Flex's buffers.  */
   /* Reclaim Flex's buffers.  */

-  yy_delete_buffer (YY_CURRENT_BUFFER);
+  yylex_destroy ();
+}
+
+static inline warnings
+flag (const char *arg)
+{
+  switch (arg[1])
+    {
+    case 'w': return Wother;
+    case 'c': return complaint;
+    case 'f': return fatal;
+    default: aver (false); break;
+    }
+}
+
+static void
+at_directive_perform (int argc, char *argv[], char **outnamep, int *out_linenop)
+{
+  if (STREQ (argv[0], "@basename"))
+    {
+      if (argc > 2)
+        fail_for_at_directive_too_many_args (argv[0]);
+      fputs (last_component (argv[1]), yyout);
+    }
+  else if (STREQ (argv[0], "@warn")
+           || STREQ (argv[0], "@complain")
+           || STREQ (argv[0], "@fatal"))
+    {
+      warnings w = flag (*argv);
+      location loc;
+      location *locp = NULL;
+      if (argc < 4)
+        fail_for_at_directive_too_few_args (argv[0]);
+      if (argv[1] && argv[1][0])
+        {
+          boundary_set_from_string (&loc.start, argv[1]);
+          boundary_set_from_string (&loc.end, argv[2]);
+          locp = &loc;
+        }
+      argc -= 2;
+      argv += 2;
+      complain_args (locp, w, argc, argv);
+    }
+  else if (STREQ (argv[0], "@output"))
+    {
+      if (argc > 2)
+        fail_for_at_directive_too_many_args (argv[0]);
+      if (*outnamep)
+        {
+          free (*outnamep);
+          xfclose (yyout);
+        }
+      *outnamep = xstrdup (argv[1]);
+      output_file_name_check (outnamep);
+      yyout = xfopen (*outnamep, "w");
+      *out_linenop = 1;
+    }
+  else
+    fail_for_invalid_at (argv[0]);
+}
+
+static void
+fail_for_at_directive_too_few_args (char const *at_directive_name)
+{
+  complain (NULL, fatal, _("too few arguments for %s directive in skeleton"),
+            at_directive_name);
+}
+
+static void
+fail_for_at_directive_too_many_args (char const *at_directive_name)
+{
+  complain (NULL, fatal, _("too many arguments for %s directive in skeleton"),
+            at_directive_name);
+}
+
+static void
+fail_for_invalid_at (char const *at)
+{
+  complain (NULL, fatal, "invalid @ in skeleton: %s", at);

 }
 }