src/scan-skel.l

   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 }