src/scan-skel.l

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

   Copyright (C) 2001-2007, 2009-2012 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 noinput 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 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.  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);
"@`" /* Empty.  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, ']'); }
  "@`" /* Empty.  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) 2001-2007, 2009-2012 Free Software Foundation, Inc.
	4
	5	This file is part of Bison, the GNU Compiler Compiler.
	6
	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.
	11
	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.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	%option nodefault noyywrap noinput nounput never-interactive debug
	21	%option prefix="skel_" outfile="lex.yy.c"
	22
	23	%{
	24	/* Work around a bug in flex 2.5.31. See Debian bug 333231
	25	<http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=333231>. */
	26	#undef skel_wrap
	27	#define skel_wrap() 1
	28
	29	#define FLEX_PREFIX(Id) skel_ ## Id
	30	#include "flex-scanner.h"
	31
	32	#include <dirname.h>
	33	#include <error.h>
	34	#include <quotearg.h>
	35
	36	#include "complain.h"
	37	#include "getargs.h"
	38	#include "files.h"
	39	#include "scan-skel.h"
	40
	41	#define YY_DECL static int skel_lex (void)
	42	YY_DECL;
	43
	44	#define QPUTS(String) \
	45	fputs (quotearg_style (c_quoting_style, String), yyout)
	46
	47	static void at_directive_perform (int at_directive_argc,
	48	char *at_directive_argv[],
	49	char *outnamep, int out_linenop);
	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	%}
	54
	55	%x SC_AT_DIRECTIVE_ARGS
	56	%x SC_AT_DIRECTIVE_SKIP_WS
	57
	58	%%
	59
	60	%{
	61	int out_lineno PACIFY_CC (= 0);
	62	char *outname = NULL;
	63
	64	/* Currently, only the @warn, @complain, @fatal, @warn_at, @complain_at, and
	65	@fatal_at directives take multiple arguments, and the last three already
	66	can't take more than 7. at_directive_argv[0] is the directive name. */
	67	#define AT_DIRECTIVE_ARGC_MAX 8
	68	int at_directive_argc = 0;
	69	char *at_directive_argv[AT_DIRECTIVE_ARGC_MAX];
	70	%}
	71
	72	"@@" fputc ('@', yyout);
	73	"@{" fputc ('[', yyout);
	74	"@}" fputc (']', yyout);
	75	"@`" /* Empty. Used by b4_cat in ../data/bison.m4. */
	76	@\n /* Likewise. */
	77
	78	"@oline@" fprintf (yyout, "%d", out_lineno + 1);
	79	"@ofile@" QPUTS (outname);
	80	"@dir_prefix@" QPUTS (dir_prefix);
	81
	82	@[a-z_]+"(" {
	83	yytext[yyleng-1] = '\0';
	84	obstack_grow (&obstack_for_string, yytext, yyleng);
	85	at_directive_argv[at_directive_argc++] =
	86	obstack_finish (&obstack_for_string);
	87	BEGIN SC_AT_DIRECTIVE_ARGS;
	88	}
	89
	90	/* This pattern must not match more than the previous @ patterns. */
	91	@[^@{}`(\n]* fail_for_invalid_at (yytext);
	92	\n out_lineno++; ECHO;
	93	[^@\n]+ ECHO;
	94
	95	<INITIAL><<EOF>> {
	96	if (outname)
	97	{
	98	free (outname);
	99	xfclose (yyout);
	100	}
	101	return EOF;
	102	}
	103
	104	<SC_AT_DIRECTIVE_ARGS>{
	105	[^@]+ { STRING_GROW; }
	106
	107	"@@" { obstack_1grow (&obstack_for_string, '@'); }
	108	"@{" { obstack_1grow (&obstack_for_string, '['); }
	109	"@}" { obstack_1grow (&obstack_for_string, ']'); }
	110	"@`" /* Empty. Useful for starting an argument
	111	that begins with whitespace. */
	112	@\n /* Empty. */
	113
	114	@[,)] {
	115	if (at_directive_argc >= AT_DIRECTIVE_ARGC_MAX)
	116	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	117
	118	obstack_1grow (&obstack_for_string, '\0');
	119	at_directive_argv[at_directive_argc++] =
	120	obstack_finish (&obstack_for_string);
	121
	122	/* Like M4, skip whitespace after a comma. */
	123	if (yytext[1] == ',')
	124	BEGIN SC_AT_DIRECTIVE_SKIP_WS;
	125	else
	126	{
	127	at_directive_perform (at_directive_argc, at_directive_argv,
	128	&outname, &out_lineno);
	129	obstack_free (&obstack_for_string, at_directive_argv[0]);
	130	at_directive_argc = 0;
	131	BEGIN INITIAL;
	132	}
	133	}
	134
	135	@.? { fail_for_invalid_at (yytext); }
	136	}
	137
	138	<SC_AT_DIRECTIVE_SKIP_WS>{
	139	[ \t\r\n]
	140	. { yyless (0); BEGIN SC_AT_DIRECTIVE_ARGS; }
	141	}
	142
	143	<SC_AT_DIRECTIVE_ARGS,SC_AT_DIRECTIVE_SKIP_WS>{
	144	<<EOF>> {
	145	fatal (_("unclosed %s directive in skeleton"), at_directive_argv[0]);
	146	}
	147	}
	148
	149	%%
	150
	151	/*------------------------.
	152	\| Scan a Bison skeleton. \|
	153	`------------------------*/
	154
	155	void
	156	scan_skel (FILE *in)
	157	{
	158	static bool initialized = false;
	159	if (!initialized)
	160	{
	161	initialized = true;
	162	obstack_init (&obstack_for_string);
	163	}
	164	skel_in = in;
	165	skel__flex_debug = trace_flag & trace_skeleton;
	166	skel_lex ();
	167	}
	168
	169	void
	170	skel_scanner_free (void)
	171	{
	172	obstack_free (&obstack_for_string, 0);
	173	/* Reclaim Flex's buffers. */
	174	yylex_destroy ();
	175	}
	176
	177	static void
	178	at_directive_perform (int at_directive_argc,
	179	char *at_directive_argv[],
	180	char *outnamep, int out_linenop)
	181	{
	182	if (0 == strcmp (at_directive_argv[0], "@basename"))
	183	{
	184	if (at_directive_argc > 2)
	185	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	186	fputs (last_component (at_directive_argv[1]), yyout);
	187	}
	188	else if (0 == strcmp (at_directive_argv[0], "@warn")
	189	\|\| 0 == strcmp (at_directive_argv[0], "@complain")
	190	\|\| 0 == strcmp (at_directive_argv[0], "@fatal"))
	191	{
	192	void (func)(char const , ...);
	193	switch (at_directive_argv[0][1])
	194	{
	195	case 'w': func = warn; break;
	196	case 'c': func = complain; break;
	197	case 'f': func = fatal; break;
	198	default: aver (false); break;
	199	}
	200	switch (at_directive_argc)
	201	{
	202	case 2:
	203	func (_(at_directive_argv[1]));
	204	break;
	205	case 3:
	206	func (_(at_directive_argv[1]), at_directive_argv[2]);
	207	break;
	208	case 4:
	209	func (_(at_directive_argv[1]), at_directive_argv[2],
	210	at_directive_argv[3]);
	211	break;
	212	case 5:
	213	func (_(at_directive_argv[1]), at_directive_argv[2],
	214	at_directive_argv[3], at_directive_argv[4]);
	215	break;
	216	case 6:
	217	func (_(at_directive_argv[1]), at_directive_argv[2],
	218	at_directive_argv[3], at_directive_argv[4],
	219	at_directive_argv[5]);
	220	break;
	221	default:
	222	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	223	break;
	224	}
	225	}
	226	else if (0 == strcmp (at_directive_argv[0], "@warn_at")
	227	\|\| 0 == strcmp (at_directive_argv[0], "@complain_at")
	228	\|\| 0 == strcmp (at_directive_argv[0], "@fatal_at"))
	229	{
	230	void (func)(location, char const , ...);
	231	location loc;
	232	if (at_directive_argc < 4)
	233	fail_for_at_directive_too_few_args (at_directive_argv[0]);
	234	switch (at_directive_argv[0][1])
	235	{
	236	case 'w': func = warn_at; break;
	237	case 'c': func = complain_at; break;
	238	case 'f': func = fatal_at; break;
	239	default: aver (false); break;
	240	}
	241	boundary_set_from_string (&loc.start, at_directive_argv[1]);
	242	boundary_set_from_string (&loc.end, at_directive_argv[2]);
	243	switch (at_directive_argc)
	244	{
	245	case 4:
	246	func (loc, _(at_directive_argv[3]));
	247	break;
	248	case 5:
	249	func (loc, _(at_directive_argv[3]), at_directive_argv[4]);
	250	break;
	251	case 6:
	252	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	253	at_directive_argv[5]);
	254	break;
	255	case 7:
	256	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	257	at_directive_argv[5], at_directive_argv[6]);
	258	break;
	259	case 8:
	260	func (loc, _(at_directive_argv[3]), at_directive_argv[4],
	261	at_directive_argv[5], at_directive_argv[6],
	262	at_directive_argv[7]);
	263	break;
	264	default:
	265	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	266	break;
	267	}
	268	}
	269	else if (0 == strcmp (at_directive_argv[0], "@output"))
	270	{
	271	if (at_directive_argc > 2)
	272	fail_for_at_directive_too_many_args (at_directive_argv[0]);
	273	if (*outnamep)
	274	{
	275	free (*outnamep);
	276	xfclose (yyout);
	277	}
	278	*outnamep = xstrdup (at_directive_argv[1]);
	279	output_file_name_check (outnamep);
	280	yyout = xfopen (*outnamep, "w");
	281	*out_linenop = 1;
	282	}
	283	else
	284	fail_for_invalid_at (at_directive_argv[0]);
	285	}
	286
	287	static void
	288	fail_for_at_directive_too_few_args (char const *at_directive_name)
	289	{
	290	fatal (_("too few arguments for %s directive in skeleton"),
	291	at_directive_name);
	292	}
	293
	294	static void
	295	fail_for_at_directive_too_many_args (char const *at_directive_name)
	296	{
	297	fatal (_("too many arguments for %s directive in skeleton"),
	298	at_directive_name);
	299	}
	300
	301	static void
	302	fail_for_invalid_at (char const *at)
	303	{
	304	fatal ("invalid @ in skeleton: %s", at);
	305	}