/* 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.
- 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
- 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
+%option nodefault noyywrap noinput nounput never-interactive debug
%option prefix="skel_" outfile="lex.yy.c"
%{
-#include "system.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;
+
+%{
+ 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. |
+`------------------------*/
+
+void
+scan_skel (FILE *in)
+{
+ static bool initialized = false;
+ if (!initialized)
+ {
+ initialized = true;
+ obstack_init (&obstack_for_string);
+ }
+ skel_in = in;
+ skel__flex_debug = trace_flag & trace_skeleton;
+ skel_lex ();
+}
+
+void
+skel_scanner_free (void)
+{
+ obstack_free (&obstack_for_string, 0);
+ /* Reclaim Flex's buffers. */
+ 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], "@warn_at")
+ || STREQ (argv[0], "@complain") || STREQ (argv[0], "@complain_at")
+ || STREQ (argv[0], "@fatal") || STREQ (argv[0], "@fatal_at"))
+ {
+ warnings w = flag (*argv);
+ location loc;
+ location *locp = NULL;
+ if (STREQ (*argv + strlen (*argv) - 3, "_at"))
+ {
+ if (argc < 4)
+ fail_for_at_directive_too_few_args (argv[0]);
+ boundary_set_from_string (&loc.start, argv[1]);
+ boundary_set_from_string (&loc.end, argv[2]);
+ argc -= 2;
+ argv += 2;
+ locp = &loc;
+ }
+ else if (argc < 2)
+ fail_for_at_directive_too_few_args (argv[0]);
+ 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);
+}
projects / bison.git / blobdiff