1 /* Scan Bison Skeletons. -*- C -*-
3 Copyright (C) 2001-2015, 2018-2022 Free Software Foundation, Inc.
5 This file is part of Bison, the GNU Compiler Compiler.
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <https://www.gnu.org/licenses/>. */
20 %option nodefault noyywrap noinput nounput never-interactive debug
21 %option prefix="skel_" outfile="lex.yy.c"
26 #include <path-join.h>
29 #include "src/complain.h"
30 #include "src/files.h"
31 #include "src/getargs.h"
32 #include "src/scan-skel.h"
34 #define FLEX_PREFIX(Id) skel_ ## Id
35 #include "src/flex-scanner.h"
37 /* Work around a bug in flex 2.5.31. See Debian bug 333231
38 <https://bugs.debian.org/333231>. */
42 #define YY_DECL static int skel_lex (void)
45 typedef void (*at_directive)(int, char**, char **, int*);
46 static void at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun);
47 static void at_basename (int argc, char *argv[], char**, int*);
48 static void at_complain (int argc, char *argv[], char**, int*);
49 static void at_output (int argc, char *argv[], char **name, int *lineno);
50 static void fail_for_at_directive_too_many_args (char const *at_directive_name);
51 static void fail_for_at_directive_too_few_args (char const *at_directive_name);
52 static void fail_for_invalid_at (char const *at);
53 static void output_mapped_file (char const *name);
56 /* Identifiers of our M4 macros. */
57 macro [bm]4_[a-zA-Z_0-9]*
58 /* Safe sequence of word-constituent characters. */
59 identifier [A-Za-z_0-9]+
61 %x SC_AT_DIRECTIVE_ARGS
62 %x SC_AT_DIRECTIVE_SKIP_WS
67 int out_lineno PACIFY_CC (= 0);
68 char *out_name = NULL;
70 /* Currently, only the @complain directive takes multiple arguments, and
71 never more than 7, with argv[0] being the directive name and argv[1]
72 being the type of complaint to dispatch. */
76 at_directive at_ptr = NULL;
79 "@@" fputc ('@', yyout);
80 "@{" fputc ('[', yyout);
81 "@}" fputc (']', yyout);
82 "@'" continue; /* Used by b4_cat in ../data/bison.m4. */
85 "@oline@" fprintf (yyout, "%d", out_lineno + 1);
86 "@ofile@" output_mapped_file (out_name);
88 "@basename(" at_init (&argc, argv, &at_ptr, &at_basename);
89 "@complain(" at_init (&argc, argv, &at_ptr, &at_complain);
90 "@output(" at_init (&argc, argv, &at_ptr, &at_output);
92 /* This pattern must not match more than the previous @ patterns. */
93 @[^@{}''(\n]* fail_for_invalid_at (yytext);
94 \n out_lineno++; ECHO;
97 /* If there are still identifiers that look like macros, such as
98 b4_synbol, this probably an error, say a typo in M4, or
101 location loc = empty_loc;
102 loc.start.file = map_file_name (out_name);
103 loc.start.line = out_lineno;
105 complain (&loc, Wother,
106 "suspicious sequence in the output: %s", yytext);
121 <SC_AT_DIRECTIVE_ARGS>
123 [^@]+ STRING_GROW ();
125 "@@" STRING_1GROW ('@');
126 "@{" STRING_1GROW ('[');
127 "@}" STRING_1GROW (']');
128 "@'" continue; /* For starting an argument that begins with whitespace. */
132 if (argc >= ARGC_MAX)
133 fail_for_at_directive_too_many_args (argv[0]);
135 argv[argc++] = obstack_finish0 (&obstack_for_string);
137 /* Like M4, skip whitespace after a comma. */
138 if (yytext[1] == ',')
139 BEGIN SC_AT_DIRECTIVE_SKIP_WS;
143 at_ptr (argc, argv, &out_name, &out_lineno);
144 obstack_free (&obstack_for_string, argv[0]);
150 @.? fail_for_invalid_at (yytext);
153 <SC_AT_DIRECTIVE_SKIP_WS>
156 . yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS;
159 <SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>
161 <<EOF>> complain (NULL, fatal, _("unclosed %s directive in skeleton"), argv[0]);
167 at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun)
170 yytext[yyleng-1] = '\0';
171 obstack_grow (&obstack_for_string, yytext, yyleng);
172 argv[(*argc)++] = obstack_finish (&obstack_for_string);
173 BEGIN SC_AT_DIRECTIVE_ARGS;
176 /*------------------------.
177 | Scan a Bison skeleton. |
178 `------------------------*/
183 static bool initialized = false;
187 obstack_init (&obstack_for_string);
190 skel__flex_debug = trace_flag & trace_skeleton;
195 skel_scanner_free (void)
197 obstack_free (&obstack_for_string, 0);
198 /* Reclaim Flex's buffers. */
202 static inline warnings
203 flag (const char *arg)
205 /* compare with values issued from b4_error */
206 if (STREQ (arg, "complain"))
208 else if (STREQ (arg, "deprecated"))
210 else if (STREQ (arg, "fatal"))
212 else if (STREQ (arg, "note"))
213 return silent | complaint | no_caret | note;
214 else if (STREQ (arg, "warn"))
221 at_basename (int argc, char *argv[], char **out_namep, int *out_linenop)
226 fail_for_at_directive_too_many_args (argv[0]);
227 fputs (last_component (argv[1]), yyout);
231 at_complain (int argc, char *argv[], char **out_namep, int *out_linenop)
234 fail_for_at_directive_too_few_args (argv[0]);
239 warnings w = flag (argv[1]);
242 location *locp = NULL;
243 if (argv[2] && argv[2][0])
245 boundary_set_from_string (&loc.start, argv[2]);
246 boundary_set_from_string (&loc.end, argv[3]);
249 complain_args (locp, w, argc - 4, argv + 4);
253 at_output (int argc, char *argv[], char **out_namep, int *out_linenop)
256 fail_for_at_directive_too_many_args (argv[0]);
262 *out_namep = xpath_join (argv[1], 2 < argc ? argv[2] : NULL);
263 output_file_name_check (out_namep, true);
264 /* If there were errors, do not generate the output. */
265 yyout = xfopen (complaint_status ? "/dev/null" : *out_namep, "w");
270 fail_for_at_directive_too_few_args (char const *at_directive_name)
272 complain (NULL, fatal, _("too few arguments for %s directive in skeleton"),
277 fail_for_at_directive_too_many_args (char const *at_directive_name)
279 complain (NULL, fatal, _("too many arguments for %s directive in skeleton"),
284 fail_for_invalid_at (char const *at)
286 complain (NULL, fatal, "invalid @ in skeleton: %s", at);
290 output_mapped_file (char const *name)
292 fputs (quotearg_style (c_quoting_style, map_file_name (name)), yyout);