tests/reduce.at

   1 # Exercising Bison Grammar Reduction.                      -*- Autotest -*-
   2 # Copyright (C) 2001, 2002, 2007, 2008 Free Software Foundation, Inc.
   3
   4 # This program is free software: you can redistribute it and/or modify
   5 # it under the terms of the GNU General Public License as published by
   6 # the Free Software Foundation, either version 3 of the License, or
   7 # (at your option) any later version.
   8 #
   9 # This program is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 # GNU General Public License for more details.
  13 #
  14 # You should have received a copy of the GNU General Public License
  15 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16
  17 AT_BANNER([[Grammar Reduction.]])
  18
  19
  20 ## ------------------- ##
  21 ## Useless Terminals.  ##
  22 ## ------------------- ##
  23
  24 AT_SETUP([Useless Terminals])
  25
  26 AT_DATA([[input.y]],
  27 [[%verbose
  28 %output "input.c"
  29
  30 %token useless1
  31 %token useless2
  32 %token useless3
  33 %token useless4
  34 %token useless5
  35 %token useless6
  36 %token useless7
  37 %token useless8
  38 %token useless9
  39
  40 %token useful
  41 %%
  42 exp: useful;
  43 ]])
  44
  45 AT_BISON_CHECK([[input.y]])
  46
  47 AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
  48 [[Terminals unused in grammar
  49    useless1
  50    useless2
  51    useless3
  52    useless4
  53    useless5
  54    useless6
  55    useless7
  56    useless8
  57    useless9
  58 ]])
  59
  60 AT_CLEANUP
  61
  62
  63
  64 ## ---------------------- ##
  65 ## Useless Nonterminals.  ##
  66 ## ---------------------- ##
  67
  68 AT_SETUP([Useless Nonterminals])
  69
  70 AT_DATA([[input.y]],
  71 [[%verbose
  72 %output "input.c"
  73
  74 %nterm useless1
  75 %nterm useless2
  76 %nterm useless3
  77 %nterm useless4
  78 %nterm useless5
  79 %nterm useless6
  80 %nterm useless7
  81 %nterm useless8
  82 %nterm useless9
  83
  84 %token useful
  85 %%
  86 exp: useful;
  87 ]])
  88
  89 AT_BISON_CHECK([[input.y]], 0, [],
  90 [[input.y: warning: 9 nonterminals useless in grammar
  91 input.y:4.8-15: warning: nonterminal useless in grammar: useless1
  92 input.y:5.8-15: warning: nonterminal useless in grammar: useless2
  93 input.y:6.8-15: warning: nonterminal useless in grammar: useless3
  94 input.y:7.8-15: warning: nonterminal useless in grammar: useless4
  95 input.y:8.8-15: warning: nonterminal useless in grammar: useless5
  96 input.y:9.8-15: warning: nonterminal useless in grammar: useless6
  97 input.y:10.8-15: warning: nonterminal useless in grammar: useless7
  98 input.y:11.8-15: warning: nonterminal useless in grammar: useless8
  99 input.y:12.8-15: warning: nonterminal useless in grammar: useless9
 100 ]])
 101
 102 AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
 103 [[Nonterminals useless in grammar
 104    useless1
 105    useless2
 106    useless3
 107    useless4
 108    useless5
 109    useless6
 110    useless7
 111    useless8
 112    useless9
 113 ]])
 114
 115 AT_CLEANUP
 116
 117
 118
 119 ## --------------- ##
 120 ## Useless Rules.  ##
 121 ## --------------- ##
 122
 123 AT_SETUP([Useless Rules])
 124
 125 AT_KEYWORDS([report])
 126
 127 AT_DATA([[input.y]],
 128 [[%verbose
 129 %output "input.c"
 130 %token useful
 131 %%
 132 exp: useful;
 133 useless1: '1';
 134 useless2: '2';
 135 useless3: '3';
 136 useless4: '4';
 137 useless5: '5';
 138 useless6: '6';
 139 useless7: '7';
 140 useless8: '8';
 141 useless9: '9';
 142 ]])
 143
 144 AT_BISON_CHECK([[input.y]], 0, [],
 145 [[input.y: warning: 9 nonterminals useless in grammar
 146 input.y: warning: 9 rules useless in grammar
 147 input.y:6.1-8: warning: nonterminal useless in grammar: useless1
 148 input.y:7.1-8: warning: nonterminal useless in grammar: useless2
 149 input.y:8.1-8: warning: nonterminal useless in grammar: useless3
 150 input.y:9.1-8: warning: nonterminal useless in grammar: useless4
 151 input.y:10.1-8: warning: nonterminal useless in grammar: useless5
 152 input.y:11.1-8: warning: nonterminal useless in grammar: useless6
 153 input.y:12.1-8: warning: nonterminal useless in grammar: useless7
 154 input.y:13.1-8: warning: nonterminal useless in grammar: useless8
 155 input.y:14.1-8: warning: nonterminal useless in grammar: useless9
 156 input.y:6.11-13: warning: rule useless in grammar: useless1: '1'
 157 input.y:7.11-13: warning: rule useless in grammar: useless2: '2'
 158 input.y:8.11-13: warning: rule useless in grammar: useless3: '3'
 159 input.y:9.11-13: warning: rule useless in grammar: useless4: '4'
 160 input.y:10.11-13: warning: rule useless in grammar: useless5: '5'
 161 input.y:11.11-13: warning: rule useless in grammar: useless6: '6'
 162 input.y:12.11-13: warning: rule useless in grammar: useless7: '7'
 163 input.y:13.11-13: warning: rule useless in grammar: useless8: '8'
 164 input.y:14.11-13: warning: rule useless in grammar: useless9: '9'
 165 ]])
 166
 167 AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
 168 [[Nonterminals useless in grammar
 169    useless1
 170    useless2
 171    useless3
 172    useless4
 173    useless5
 174    useless6
 175    useless7
 176    useless8
 177    useless9
 178 Terminals unused in grammar
 179    '1'
 180    '2'
 181    '3'
 182    '4'
 183    '5'
 184    '6'
 185    '7'
 186    '8'
 187    '9'
 188 Rules useless in grammar
 189     2 useless1: '1'
 190     3 useless2: '2'
 191     4 useless3: '3'
 192     5 useless4: '4'
 193     6 useless5: '5'
 194     7 useless6: '6'
 195     8 useless7: '7'
 196     9 useless8: '8'
 197    10 useless9: '9'
 198 ]])
 199
 200 AT_CLEANUP
 201
 202
 203
 204 ## ------------------- ##
 205 ## Reduced Automaton.  ##
 206 ## ------------------- ##
 207
 208 # Check that the automaton is that as the for the grammar reduced by
 209 # hand.
 210
 211 AT_SETUP([Reduced Automaton])
 212
 213 AT_KEYWORDS([report])
 214
 215 # The non reduced grammar.
 216 # ------------------------
 217 AT_DATA([[not-reduced.y]],
 218 [[/* A useless token. */
 219 %token useless_token
 220 /* A useful one. */
 221 %token useful
 222 %verbose
 223 %output "not-reduced.c"
 224
 225 %%
 226
 227 exp: useful            { /* A useful action. */ }
 228    | non_productive    { /* A non productive action. */ }
 229    ;
 230
 231 not_reachable: useful  { /* A not reachable action. */ }
 232              ;
 233
 234 non_productive: non_productive useless_token
 235                        { /* Another non productive action. */ }
 236               ;
 237 %%
 238 ]])
 239
 240 AT_BISON_CHECK([[not-reduced.y]], 0, [],
 241 [[not-reduced.y: warning: 2 nonterminals useless in grammar
 242 not-reduced.y: warning: 3 rules useless in grammar
 243 not-reduced.y:14.1-13: warning: nonterminal useless in grammar: not_reachable
 244 not-reduced.y:11.6-19: warning: nonterminal useless in grammar: non_productive
 245 not-reduced.y:11.6-57: warning: rule useless in grammar: exp: non_productive
 246 not-reduced.y:14.16-56: warning: rule useless in grammar: not_reachable: useful
 247 not-reduced.y:17.17-18.63: warning: rule useless in grammar: non_productive: non_productive useless_token
 248 ]])
 249
 250 AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' not-reduced.output]], 0,
 251 [[Nonterminals useless in grammar
 252    not_reachable
 253    non_productive
 254 Terminals unused in grammar
 255    useless_token
 256 Rules useless in grammar
 257     2 exp: non_productive
 258     3 not_reachable: useful
 259     4 non_productive: non_productive useless_token
 260 ]])
 261
 262 # The reduced grammar.
 263 # --------------------
 264 AT_DATA([[reduced.y]],
 265 [[/* A useless token. */
 266 %token useless_token
 267 /* A useful one. */
 268 %token useful
 269 %verbose
 270 %output "reduced.c"
 271
 272 %%
 273
 274 exp: useful            { /* A useful action. */ }
 275 //   | non_productive    { /* A non productive action. */ } */
 276    ;
 277
 278 //not_reachable: useful  { /* A not reachable action. */ }
 279 //             ;
 280
 281 //non_productive: non_productive useless_token
 282 //                       { /* Another non productive action. */ }
 283 //              ;
 284 %%
 285 ]])
 286
 287 AT_BISON_CHECK([[reduced.y]])
 288
 289 # Comparing the parsers.
 290 cp reduced.c expout
 291 AT_CHECK([sed 's/not-reduced/reduced/g' not-reduced.c], 0, [expout])
 292
 293 AT_CLEANUP
 294
 295
 296
 297 ## ------------------- ##
 298 ## Underivable Rules.  ##
 299 ## ------------------- ##
 300
 301 AT_SETUP([Underivable Rules])
 302
 303 AT_KEYWORDS([report])
 304
 305 AT_DATA([[input.y]],
 306 [[%verbose
 307 %output "input.c"
 308 %token useful
 309 %%
 310 exp: useful | underivable;
 311 underivable: indirection;
 312 indirection: underivable;
 313 ]])
 314
 315 AT_BISON_CHECK([[input.y]], 0, [],
 316 [[input.y: warning: 2 nonterminals useless in grammar
 317 input.y: warning: 3 rules useless in grammar
 318 input.y:5.15-25: warning: nonterminal useless in grammar: underivable
 319 input.y:6.14-24: warning: nonterminal useless in grammar: indirection
 320 input.y:5.15-25: warning: rule useless in grammar: exp: underivable
 321 input.y:6.14-24: warning: rule useless in grammar: underivable: indirection
 322 input.y:7.14-24: warning: rule useless in grammar: indirection: underivable
 323 ]])
 324
 325 AT_CHECK([[sed -n '/^Grammar/q;/^$/!p' input.output]], 0,
 326 [[Nonterminals useless in grammar
 327    underivable
 328    indirection
 329 Rules useless in grammar
 330     2 exp: underivable
 331     3 underivable: indirection
 332     4 indirection: underivable
 333 ]])
 334
 335 AT_CLEANUP
 336
 337
 338
 339 ## ---------------- ##
 340 ## Empty Language.  ##
 341 ## ---------------- ##
 342
 343 AT_SETUP([Empty Language])
 344
 345 AT_DATA([[input.y]],
 346 [[%output "input.c"
 347 %%
 348 exp: exp;
 349 ]])
 350
 351 AT_BISON_CHECK([[input.y]], 1, [],
 352 [[input.y: warning: 2 nonterminals useless in grammar
 353 input.y: warning: 2 rules useless in grammar
 354 input.y:3.1-3: fatal error: start symbol exp does not derive any sentence
 355 ]])
 356
 357 AT_CLEANUP