X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/536545f3a45d64cad0469efa125d3d96052e723c..957255b82cdbf46a5f74d33862ad7edf7d0fa218:/src/scan-skel.l diff --git a/src/scan-skel.l b/src/scan-skel.l index 2d9cef13..129b8899 100644 --- a/src/scan-skel.l +++ b/src/scan-skel.l @@ -1,100 +1,271 @@ /* Scan Bison Skeletons. -*- C -*- - Copyright (C) 2001, 2002 Free Software Foundation, Inc. + + Copyright (C) 2001-2013 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 . */ -%option nodefault noyywrap nounput never-interactive +%option nodefault noyywrap noinput nounput never-interactive debug %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 + . */ +#undef skel_wrap +#define skel_wrap() 1 + +#define FLEX_PREFIX(Id) skel_ ## Id +#include + +#include +#include +#include + +#include +#include +#include +#include + +#define YY_DECL static int skel_lex (void) +YY_DECL; + +typedef void (*at_directive)(int, char**, char **, int*); +static void at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun); +static void at_basename (int argc, char *argv[], char**, int*); +static void at_complain (int argc, char *argv[], char**, int*); +static void at_output (int argc, char *argv[], char **name, int *lineno); +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); %} -%% - /* 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; - -<> xfclose (yyout); free (yyoutname); return EOF; + +%x SC_AT_DIRECTIVE_ARGS +%x SC_AT_DIRECTIVE_SKIP_WS + %% -/* From lib/readpipe.c. */ -FILE *readpipe PARAMS ((const char *, ...)); +%{ + int out_lineno PACIFY_CC (= 0); + char *out_name = NULL; + + /* Currently, only the @complain directive takes multiple arguments, and + never more than 7, with argv[0] being the directive name and argv[1] + being the type of complaint to dispatch. */ +#define ARGC_MAX 9 + int argc = 0; + char *argv[ARGC_MAX]; + at_directive at_ptr = NULL; +%} + +"@@" fputc ('@', yyout); +"@{" fputc ('[', yyout); +"@}" fputc (']', yyout); +"@'" continue; /* Used by b4_cat in ../data/bison.m4. */ +@\n continue; -/*----------------------. -| Run our backend, M4. | -`----------------------*/ +"@oline@" fprintf (yyout, "%d", out_lineno + 1); +"@ofile@" fputs (quotearg_style (c_quoting_style, out_name), yyout); -void m4_invoke PARAMS ((const char *definitions)); +"@basename(" at_init (&argc, argv, &at_ptr, &at_basename); +"@complain(" at_init (&argc, argv, &at_ptr, &at_complain); +"@output(" at_init (&argc, argv, &at_ptr, &at_output); + + /* This pattern must not match more than the previous @ patterns. */ +@[^@{}\'(\n]* fail_for_invalid_at (yytext); +\n out_lineno++; ECHO; +[^@\n]+ ECHO; + +<> { + if (out_name) + { + free (out_name); + xfclose (yyout); + } + return EOF; +} + + +{ + [^@]+ 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 + { + aver (at_ptr); + at_ptr (argc, argv, &out_name, &out_lineno); + obstack_free (&obstack_for_string, argv[0]); + argc = 0; + BEGIN INITIAL; + } + } + + @.? fail_for_invalid_at (yytext); +} + + +{ + [ \t\r\n] continue; + . yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; +} + + +{ + <> complain (NULL, fatal, _("unclosed %s directive in skeleton"), argv[0]); +} + +%% + +static void +at_init (int *argc, char *argv[], at_directive *at_ptr, at_directive fun) +{ + *at_ptr = fun; + yytext[yyleng-1] = '\0'; + obstack_grow (&obstack_for_string, yytext, yyleng); + argv[(*argc)++] = obstack_finish (&obstack_for_string); + BEGIN SC_AT_DIRECTIVE_ARGS; +} + +/*------------------------. +| Scan a Bison skeleton. | +`------------------------*/ void -m4_invoke (const char *definitions) +scan_skel (FILE *in) { - /* Invoke m4 on the definition of the muscles, and the skeleton. */ - const char *bison_pkgdatadir = getenv ("BISON_PKGDATADIR"); - const char *m4 = getenv ("M4"); - int pkg_data_len; - char *full_skeleton; - - if (!m4) - m4 = M4; - if (!bison_pkgdatadir) - bison_pkgdatadir = PKGDATADIR; - pkg_data_len = strlen (bison_pkgdatadir); - full_skeleton = XMALLOC (char, pkg_data_len + strlen (skeleton) + 2); - if (bison_pkgdatadir[pkg_data_len-1] == '/') - sprintf (full_skeleton, "%s%s", bison_pkgdatadir, skeleton); - else - sprintf (full_skeleton, "%s/%s", bison_pkgdatadir, skeleton); - if (trace_flag) - fprintf (stderr, - "running: %s -I %s m4sugar/m4sugar.m4 %s %s\n", - m4, bison_pkgdatadir, definitions, full_skeleton); - skel_in = readpipe (m4, - "-I", bison_pkgdatadir, - "m4sugar/m4sugar.m4", - definitions, - full_skeleton, - NULL); - XFREE (full_skeleton); - if (!skel_in) - error (EXIT_FAILURE, errno, "cannot run m4"); + 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. */ - yy_delete_buffer (YY_CURRENT_BUFFER); + yylex_destroy (); +} + +static inline warnings +flag (const char *arg) +{ + /* compare with values issued from b4_error */ + if (STREQ (arg, "complain")) + return complaint; + else if (STREQ (arg, "deprecated")) + return Wdeprecated; + else if (STREQ (arg, "fatal")) + return fatal; + else if (STREQ (arg, "note")) + return silent | complaint | no_caret; + else if (STREQ (arg, "warn")) + return Wother; + else + aver (false); +} + +static void +at_basename (int argc, char *argv[], char **out_namep, int *out_linenop) +{ + (void) out_namep; + (void) out_linenop; + if (2 < argc) + fail_for_at_directive_too_many_args (argv[0]); + fputs (last_component (argv[1]), yyout); +} + +static void +at_complain (int argc, char *argv[], char **out_namep, int *out_linenop) +{ + static unsigned indent; + warnings w = flag (argv[1]); + location loc; + location *locp = NULL; + + (void) out_namep; + (void) out_linenop; + + if (argc < 4) + fail_for_at_directive_too_few_args (argv[0]); + if (argv[2] && argv[2][0]) + { + boundary_set_from_string (&loc.start, argv[2]); + boundary_set_from_string (&loc.end, argv[3]); + locp = &loc; + } + if (w & silent) + indent += SUB_INDENT; + else + indent = 0; + complain_args (locp, w, &indent, argc - 4, argv + 4); + if (w & silent) + indent -= SUB_INDENT; +} + +static void +at_output (int argc, char *argv[], char **out_namep, int *out_linenop) +{ + if (2 < argc) + fail_for_at_directive_too_many_args (argv[0]); + if (*out_namep) + { + free (*out_namep); + xfclose (yyout); + } + *out_namep = xstrdup (argv[1]); + output_file_name_check (out_namep, true); + /* If there were errors, do not generate the output. */ + yyout = xfopen (complaint_status ? "/dev/null" : *out_namep, "w"); + *out_linenop = 1; +} + +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); }