src/scan-skel.l

/* Scan Bison Skeletons.                                       -*- C -*-

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
   Foundation, Inc.

   This file is part of Bison, the GNU Compiler Compiler.

   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.

   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 this program.  If not, see <http://www.gnu.org/licenses/>.  */

%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

#define FLEX_PREFIX(Id) skel_ ## Id
#include "flex-scanner.h"

#include <dirname.h>
#include <error.h>
#include <quotearg.h>

#include "complain.h"
#include "getargs.h"
#include "files.h"
#include "scan-skel.h"

#define YY_DECL static int skel_lex (void)
YY_DECL;

#define QPUTS(String) \
   fputs (quotearg_style (c_quoting_style, String), yyout)

static void at_directive_perform (int at_directive_argc,
                                  char *at_directive_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

%%

%{
  int out_lineno IF_LINT (= 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.  at_directive_argv[0] is the directive name.  */
  #define AT_DIRECTIVE_ARGC_MAX 8
  int at_directive_argc = 0;
  char *at_directive_argv[AT_DIRECTIVE_ARGC_MAX];
%}

"@@" fputc ('@', yyout);
"@{" fputc ('[', yyout);
"@}" fputc (']', yyout);
"@`" /* Emtpy.  Used by b4_cat in ../data/bison.m4.  */
@\n  /* Likewise.  */

"@oline@"  fprintf (yyout, "%d", out_lineno + 1);
"@ofile@"  QPUTS (outname);
"@dir_prefix@" QPUTS (dir_prefix);

@[a-z_]+"(" {
  yytext[yyleng-1] = '\0';
  obstack_grow (&obstack_for_string, yytext, yyleng);
  at_directive_argv[at_directive_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, ']'); }
  "@`" /* Emtpy.  Useful for starting an argument
          that begins with whitespace. */
  @\n  /* Empty.  */

  @[,)] {
    if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
      fail_for_at_directive_too_many_args (at_directive_argv[0]);

    obstack_1grow (&obstack_for_string, '\0');
    at_directive_argv[at_directive_argc++] =
      obstack_finish (&obstack_for_string);

    /* Like M4, skip whitespace after a comma.  */
    if (yytext[1] == ',')
      BEGIN SC_AT_DIRECTIVE_SKIP_WS;
    else
      {
        at_directive_perform (at_directive_argc, at_directive_argv,
                              &outname, &out_lineno);
        obstack_free (&obstack_for_string, at_directive_argv[0]);
        at_directive_argc = 0;
        BEGIN INITIAL;
      }
  }

  @.? { fail_for_invalid_at (yytext); }
}

<SC_AT_DIRECTIVE_SKIP_WS>{
  [ \t\r\n]
  . { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
}

<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
  <<EOF>> {
    fatal (_("unclosed %s directive in skeleton"), at_directive_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
void at_directive_perform (int at_directive_argc,
                           char *at_directive_argv[],
                           char **outnamep, int *out_linenop)
{
  if (0 == strcmp (at_directive_argv[0], "@basename"))
    {
      if (at_directive_argc > 2)
        fail_for_at_directive_too_many_args (at_directive_argv[0]);
      fputs (last_component (at_directive_argv[1]), yyout);
    }
  else if (0 == strcmp (at_directive_argv[0], "@warn")
           || 0 == strcmp (at_directive_argv[0], "@complain")
           || 0 == strcmp (at_directive_argv[0], "@fatal"))
    {
      void (*func)(char const *, ...);
      switch (at_directive_argv[0][1])
        {
          case 'w': func = warn; break;
          case 'c': func = complain; break;
          case 'f': func = fatal; break;
          default: aver (false); break;
        }
      switch (at_directive_argc)
        {
          case 2:
            func (_(at_directive_argv[1]));
            break;
          case 3:
            func (_(at_directive_argv[1]), at_directive_argv[2]);
            break;
          case 4:
            func (_(at_directive_argv[1]), at_directive_argv[2],
                  at_directive_argv[3]);
            break;
          case 5:
            func (_(at_directive_argv[1]), at_directive_argv[2],
                  at_directive_argv[3], at_directive_argv[4]);
            break;
          case 6:
            func (_(at_directive_argv[1]), at_directive_argv[2],
                  at_directive_argv[3], at_directive_argv[4],
                  at_directive_argv[5]);
            break;
          default:
            fail_for_at_directive_too_many_args (at_directive_argv[0]);
            break;
        }
    }
  else if (0 == strcmp (at_directive_argv[0], "@warn_at")
           || 0 == strcmp (at_directive_argv[0], "@complain_at")
           || 0 == strcmp (at_directive_argv[0], "@fatal_at"))
    {
      void (*func)(location, char const *, ...);
      location loc;
      if (at_directive_argc < 4)
        fail_for_at_directive_too_few_args (at_directive_argv[0]);
      switch (at_directive_argv[0][1])
        {
          case 'w': func = warn_at; break;
          case 'c': func = complain_at; break;
          case 'f': func = fatal_at; break;
          default: aver (false); break;
        }
      boundary_set_from_string (&loc.start, at_directive_argv[1]);
      boundary_set_from_string (&loc.end, at_directive_argv[2]);
      switch (at_directive_argc)
        {
          case 4:
            func (loc, _(at_directive_argv[3]));
            break;
          case 5:
            func (loc, _(at_directive_argv[3]), at_directive_argv[4]);
            break;
          case 6:
            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
                  at_directive_argv[5]);
            break;
          case 7:
            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
                  at_directive_argv[5], at_directive_argv[6]);
            break;
          case 8:
            func (loc, _(at_directive_argv[3]), at_directive_argv[4],
                  at_directive_argv[5], at_directive_argv[6],
                  at_directive_argv[7]);
            break;
          default:
            fail_for_at_directive_too_many_args (at_directive_argv[0]);
            break;
        }
    }
  else if (0 == strcmp (at_directive_argv[0], "@output"))
    {
      if (at_directive_argc > 2)
        fail_for_at_directive_too_many_args (at_directive_argv[0]);
      if (*outnamep)
        {
          free (*outnamep);
          xfclose (yyout);
        }
      *outnamep = xstrdup (at_directive_argv[1]);
      output_file_name_check (*outnamep);
      yyout = xfopen (*outnamep, "w");
      *out_linenop = 1;
    }
  else
    fail_for_invalid_at (at_directive_argv[0]);
}

static void
fail_for_at_directive_too_few_args (char const *at_directive_name)
{
  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)
{
  fatal (_("too many arguments for %s directive in skeleton"),
         at_directive_name);
}

static void
fail_for_invalid_at (char const *at)
{
  fatal ("invalid @ in skeleton: %s", at);
}
Commit	Line	Data
	1	/* Scan Bison Skeletons. -- C --
	2
	3	Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software
	4	Foundation, Inc.
	5
	6	This file is part of Bison, the GNU Compiler Compiler.
	7
	8	This program is free software: you can redistribute it and/or modify
	9	it under the terms of the GNU General Public License as published by
	10	the Free Software Foundation, either version 3 of the License, or
	11	(at your option) any later version.
	12
	13	This program is distributed in the hope that it will be useful,
	14	but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	GNU General Public License for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	20
	21	%option nodefault noyywrap nounput never-interactive debug
	22	%option prefix="skel_" outfile="lex.yy.c"
	23
	24	%{
	25	/* Work around a bug in flex 2.5.31. See Debian bug 333231
	26	<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
	27	#undef skel_wrap
	28	#define skel_wrap() 1
	29
	30	#define FLEX_PREFIX(Id) skel_ ## Id
	31	#include "flex-scanner.h"
	32
	33	#include <dirname.h>
	34	#include <error.h>
	35	#include <quotearg.h>
	36
	37	#include "complain.h"
	38	#include "getargs.h"
	39	#include "files.h"
	40	#include "scan-skel.h"
	41
	42	#define YY_DECL static int skel_lex (void)
	43	YY_DECL;
	44
	45	#define QPUTS(String) \
	46	fputs (quotearg_style (c_quoting_style, String), yyout)
	47
	48	static void at_directive_perform (int at_directive_argc,
	49	char *at_directive_argv[],
	50	char *outnamep, int out_linenop);
	51	static void fail_for_at_directive_too_many_args (char const *at_directive_name);
	52	static void fail_for_at_directive_too_few_args (char const *at_directive_name);
	53	static void fail_for_invalid_at (char const *at);
	54	%}
	55
	56	%x SC_AT_DIRECTIVE_ARGS
	57	%x SC_AT_DIRECTIVE_SKIP_WS
	58
	59	%%
	60
	61	%{
	62	int out_lineno IF_LINT (= 0);
	63	char *outname = NULL;
	64
	65	/* Currently, only the @warn, @complain, @fatal, @warn_at, @complain_at, and
	66	@fatal_at directives take multiple arguments, and the last three already
	67	can't take more than 7. at_directive_argv[0] is the directive name. */
	68	#define AT_DIRECTIVE_ARGC_MAX 8
	69	int at_directive_argc = 0;
	70	char *at_directive_argv[AT_DIRECTIVE_ARGC_MAX];
	71	%}
	72
	73	"@@" fputc ('@', yyout);
	74	"@{" fputc ('[', yyout);
	75	"@}" fputc (']', yyout);
	76	"@`" /* Emtpy. Used by b4_cat in ../data/bison.m4. */
	77	@\n /* Likewise. */
	78
	79	"@oline@" fprintf (yyout, "%d", out_lineno + 1);
	80	"@ofile@" QPUTS (outname);
	81	"@dir_prefix@" QPUTS (dir_prefix);
	82
	83	@[a-z_]+"(" {
	84	yytext[yyleng-1] = '\0';
	85	obstack_grow (&obstack_for_string, yytext, yyleng);
	86	at_directive_argv[at_directive_argc++] =
	87	obstack_finish (&obstack_for_string);
	88	BEGIN SC_AT_DIRECTIVE_ARGS;
	89	}
	90
	91	/* This pattern must not match more than the previous @ patterns. */
	92	@[^@{}`(\n]* fail_for_invalid_at (yytext);
	93	\n out_lineno++; ECHO;
	94	[^@\n]+ ECHO;
	95
	96	<INITIAL><<EOF>> {
	97	if (outname)
	98	{
	99	free (outname);
	100	xfclose (yyout);
	101	}
	102	return EOF;
	103	}
	104
	105	<SC_AT_DIRECTIVE_ARGS>{
	106	[^@]+ { STRING_GROW; }
	107
	108	"@@" { obstack_1grow (&obstack_for_string, '@'); }
	109	"@{" { obstack_1grow (&obstack_for_string, '['); }
	110	"@}" { obstack_1grow (&obstack_for_string, ']'); }
	111	"@`" /* Emtpy. Useful for starting an argument
	112	that begins with whitespace. */
	113	@\n /* Empty. */
	114
	115	@[,)] {
	116	if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
	117	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	118
	119	obstack_1grow (&obstack_for_string, '\0');
	120	at_directive_argv[at_directive_argc++] =
	121	obstack_finish (&obstack_for_string);
	122
	123	/* Like M4, skip whitespace after a comma. */
	124	if (yytext[1] == ',')
	125	BEGIN SC_AT_DIRECTIVE_SKIP_WS;
	126	else
	127	{
	128	at_directive_perform (at_directive_argc, at_directive_argv,
	129	&outname, &out_lineno);
	130	obstack_free (&obstack_for_string, at_directive_argv[0]);
	131	at_directive_argc = 0;
	132	BEGIN INITIAL;
	133	}
	134	}
	135
	136	@.? { fail_for_invalid_at (yytext); }
	137	}
	138
	139	<SC_AT_DIRECTIVE_SKIP_WS>{
	140	[ \t\r\n]
	141	. { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
	142	}
	143
	144	<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
	145	<<EOF>> {
	146	fatal (_("unclosed %s directive in skeleton"), at_directive_argv[0]);
	147	}
	148	}
	149
	150	%%
	151
	152	/*------------------------.
	153	\| Scan a Bison skeleton. \|
	154	`------------------------*/
	155
	156	void
	157	scan_skel (FILE *in)
	158	{
	159	static bool initialized = false;
	160	if (!initialized)
	161	{
	162	initialized = true;
	163	obstack_init (&obstack_for_string);
	164	}
	165	skel_in = in;
	166	skel__flex_debug = trace_flag & trace_skeleton;
	167	skel_lex ();
	168	}
	169
	170	void
	171	skel_scanner_free (void)
	172	{
	173	obstack_free (&obstack_for_string, 0);
	174	/* Reclaim Flex's buffers. */
	175	yylex_destroy ();
	176	}
	177
	178	static
	179	void at_directive_perform (int at_directive_argc,
	180	char *at_directive_argv[],
	181	char *outnamep, int out_linenop)
	182	{
	183	if (0 == strcmp (at_directive_argv[0], "@basename"))
	184	{
	185	if (at_directive_argc > 2)
	186	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	187	fputs (last_component (at_directive_argv[1]), yyout);
	188	}
	189	else if (0 == strcmp (at_directive_argv[0], "@warn")
	190	\|\| 0 == strcmp (at_directive_argv[0], "@complain")
	191	\|\| 0 == strcmp (at_directive_argv[0], "@fatal"))
	192	{
	193	void (func)(char const , ...);
	194	switch (at_directive_argv[0][1])
	195	{
	196	case 'w': func = warn; break;
	197	case 'c': func = complain; break;
	198	case 'f': func = fatal; break;
	199	default: aver (false); break;
	200	}
	201	switch (at_directive_argc)
	202	{
	203	case 2:
	204	func (_(at_directive_argv[1]));
	205	break;
	206	case 3:
	207	func (_(at_directive_argv[1]), at_directive_argv[2]);
	208	break;
	209	case 4:
	210	func (_(at_directive_argv[1]), at_directive_argv[2],
	211	at_directive_argv[3]);
	212	break;
	213	case 5:
	214	func (_(at_directive_argv[1]), at_directive_argv[2],
	215	at_directive_argv[3], at_directive_argv[4]);
	216	break;
	217	case 6:
	218	func (_(at_directive_argv[1]), at_directive_argv[2],
	219	at_directive_argv[3], at_directive_argv[4],
	220	at_directive_argv[5]);
	221	break;
	222	default:
	223	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	224	break;
	225	}
	226	}
	227	else if (0 == strcmp (at_directive_argv[0], "@warn_at")
	228	\|\| 0 == strcmp (at_directive_argv[0], "@complain_at")
	229	\|\| 0 == strcmp (at_directive_argv[0], "@fatal_at"))
	230	{
	231	void (func)(location, char const , ...);
	232	location loc;
	233	if (at_directive_argc < 4)
	234	fail_for_at_directive_too_few_args (at_directive_argv[0]);
	235	switch (at_directive_argv[0][1])
	236	{
	237	case 'w': func = warn_at; break;
	238	case 'c': func = complain_at; break;
	239	case 'f': func = fatal_at; break;
	240	default: aver (false); break;
	241	}
	242	boundary_set_from_string (&loc.start, at_directive_argv[1]);
	243	boundary_set_from_string (&loc.end, at_directive_argv[2]);
	244	switch (at_directive_argc)
	245	{
	246	case 4:
	247	func (loc, _(at_directive_argv[3]));
	248	break;
	249	case 5:
	250	func (loc, _(at_directive_argv[3]), at_directive_argv[4]);
	251	break;
	252	case 6:
	253	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	254	at_directive_argv[5]);
	255	break;
	256	case 7:
	257	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	258	at_directive_argv[5], at_directive_argv[6]);
	259	break;
	260	case 8:
	261	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	262	at_directive_argv[5], at_directive_argv[6],
	263	at_directive_argv[7]);
	264	break;
	265	default:
	266	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	267	break;
	268	}
	269	}
	270	else if (0 == strcmp (at_directive_argv[0], "@output"))
	271	{
	272	if (at_directive_argc > 2)
	273	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	274	if (*outnamep)
	275	{
	276	free (*outnamep);
	277	xfclose (yyout);
	278	}
	279	*outnamep = xstrdup (at_directive_argv[1]);
	280	output_file_name_check (*outnamep);
	281	yyout = xfopen (*outnamep, "w");
	282	*out_linenop = 1;
	283	}
	284	else
	285	fail_for_invalid_at (at_directive_argv[0]);
	286	}
	287
	288	static void
	289	fail_for_at_directive_too_few_args (char const *at_directive_name)
	290	{
	291	fatal (_("too few arguments for %s directive in skeleton"),
	292	at_directive_name);
	293	}
	294
	295	static void
	296	fail_for_at_directive_too_many_args (char const *at_directive_name)
	297	{
	298	fatal (_("too many arguments for %s directive in skeleton"),
	299	at_directive_name);
	300	}
	301
	302	static void
	303	fail_for_invalid_at (char const *at)
	304	{
	305	fatal ("invalid @ in skeleton: %s", at);
	306	}