tests/calc.at

   1 #                                                        -*- Autoconf -*-
   2
   3 cat <<EOF
   4
   5 Simple Calculator.
   6
   7 EOF
   8
   9
  10 ## ---------------------------------------------------- ##
  11 ## Compile the grammar described in the documentation.  ##
  12 ## ---------------------------------------------------- ##
  13
  14
  15 # ------------------------- #
  16 # Helping Autotest macros.  #
  17 # ------------------------- #
  18
  19
  20 # _AT_DATA_CALC_Y($1, $2, $3, [CPP-DIRECTIVES])
  21 # ---------------------------------------------
  22 # Produce `calc.y'.  Don't call this macro directly, because it contains
  23 # some occurrences of `$1' etc. which will be interpreted by m4.  So
  24 # you should call it with $1, $2, and $3 as arguments, which is what
  25 # AT_DATA_CALC_Y does.
  26 AT_DEFINE([_AT_DATA_CALC_Y],
  27 [ifelse([$1$2$3],
  28         $[1]$[2]$[3], [],
  29         [errprint([$0: Invalid arguments: $@
  30 ])m4exit(1)])dnl
  31 AT_DATA([calc.y],
  32 [[/* Infix notation calculator--calc */
  33
  34 %{
  35 #include <stdio.h>
  36 #include <stdlib.h>
  37 #include <ctype.h>
  38 ]$4[
  39
  40 static int power (int base, int exponent);
  41 static void yyerror (const char *s);
  42 static int yylex (void);
  43 extern void perror (const char *s);
  44 %}
  45
  46 /* BISON Declarations */
  47 %token NUM
  48
  49 %nonassoc '=' /* comparison            */
  50 %left '-' '+'
  51 %left '*' '/'
  52 %left NEG     /* negation--unary minus */
  53 %right '^'    /* exponentiation        */
  54
  55 /* Grammar follows */
  56 %%
  57 input:
  58   /* empty string */
  59 | input line
  60 ;
  61
  62 line:
  63   '\n'
  64 | exp '\n'
  65 ;
  66
  67 exp:
  68   NUM                { $$ = $1;             }
  69 | exp '=' exp
  70   {
  71      if ($1 != $3)
  72        printf ("calc: error: %d != %d\n", $1, $3);
  73      $$ = $1 == $3;
  74   }
  75 | exp '+' exp        { $$ = $1 + $3;        }
  76 | exp '-' exp        { $$ = $1 - $3;        }
  77 | exp '*' exp        { $$ = $1 * $3;        }
  78 | exp '/' exp        { $$ = $1 / $3;        }
  79 | '-' exp  %prec NEG { $$ = -$2;            }
  80 | exp '^' exp        { $$ = power ($1, $3); }
  81 | '(' exp ')'        { $$ = $2;             }
  82 ;
  83 %%
  84 /* The input. */
  85 FILE *yyin;
  86
  87 static void
  88 yyerror (const char *s)
  89 {
  90 #if YYLSP_NEEDED
  91   fprintf (stderr, "%d.%d:%d.%d: ",
  92            yylloc.first_line, yylloc.first_column,
  93            yylloc.last_line, yylloc.last_column);
  94 #endif
  95   fprintf (stderr, "%s\n", s);
  96 }
  97
  98 static int
  99 yygetc ()
 100 {
 101   int res = getc (yyin);
 102 #if YYLSP_NEEDED
 103   if (res == '\n')
 104     {
 105       yylloc.last_line++;
 106       yylloc.last_column = 0;
 107     }
 108   else
 109     yylloc.last_column++;
 110 #endif
 111   return res;
 112 }
 113
 114
 115 static void
 116 yyungetc (int c)
 117 {
 118 #if YYLSP_NEEDED
 119   /* Wrong when C == `\n'. */
 120   yylloc.last_column--;
 121 #endif
 122   ungetc (c, yyin);
 123 }
 124
 125 static int
 126 read_signed_integer (void)
 127 {
 128   int c = yygetc ();
 129   int sign = 1;
 130   int n = 0;
 131
 132   if (c == '-')
 133     {
 134       c = yygetc ();
 135       sign = -1;
 136     }
 137
 138   while (isdigit (c))
 139     {
 140       n = 10 * n + (c - '0');
 141       c = yygetc ();
 142     }
 143
 144   yyungetc (c);
 145
 146   return sign * n;
 147 }
 148
 149
 150
 151 /*---------------------------------------------------------------.
 152 | Lexical analyzer returns an integer on the stack and the token |
 153 | NUM, or the ASCII character read if not a number.  Skips all   |
 154 | blanks and tabs, returns 0 for EOF.                            |
 155 `---------------------------------------------------------------*/
 156
 157 static int
 158 yylex (void)
 159 {
 160   int c;
 161
 162 #if YYLSP_NEEDED
 163   yylloc.first_column = yylloc.last_column;
 164   yylloc.first_line = yylloc.last_line;
 165 #endif
 166
 167   /* Skip white space.  */
 168   while ((c = yygetc ()) == ' ' || c == '\t')
 169     {
 170 #if YYLSP_NEEDED
 171       yylloc.first_column = yylloc.last_column;
 172       yylloc.first_line = yylloc.last_line;
 173 #endif
 174     }
 175
 176   /* process numbers   */
 177   if (c == '.' || isdigit (c))
 178     {
 179       yyungetc (c);
 180       yylval = read_signed_integer ();
 181       return NUM;
 182     }
 183
 184   /* Return end-of-file.  */
 185   if (c == EOF)
 186     return 0;
 187
 188   /* Return single chars. */
 189   return c;
 190 }
 191
 192 static int
 193 power (int base, int exponent)
 194 {
 195   int res = 1;
 196   if (exponent < 0)
 197     exit (1);
 198   for (/* Niente */; exponent; --exponent)
 199     res *= base;
 200   return res;
 201 }
 202
 203 int
 204 main (int argn, const char **argv)
 205 {
 206   if (argn == 2)
 207     yyin = fopen (argv[1], "r");
 208   else
 209     yyin = stdin;
 210
 211   if (!stdin)
 212     {
 213       perror (argv[1]);
 214       exit (1);
 215     }
 216
 217 #if YYDEBUG
 218   yydebug = 1;
 219 #endif
 220 #if YYLSP_NEEDED
 221   yylloc.last_column = 0;
 222   yylloc.last_line = 1;
 223 #endif
 224   yyparse ();
 225   return 0;
 226 }
 227 ]])
 228 ])# _AT_DATA_CALC_Y
 229
 230
 231 # AT_DATA_CALC_Y([BISON-OPTIONS])
 232 # -------------------------------
 233 # Produce `calc.y'.
 234 AT_DEFINE([AT_DATA_CALC_Y],
 235 [_AT_DATA_CALC_Y($[1], $[2], $[3],
 236                  [ifelse(regexp([$1], [--yyerror-verbose]),
 237                          [-1], [],
 238                          [[#define YYERROR_VERBOSE]])])])
 239
 240
 241
 242 # _AT_CHECK_CALC(BISON-OPTIONS, INPUT)
 243 # ------------------------------------
 244 # Run `calc' on INPUT and expect no STDOUT nor STDERR.
 245 # If `--debug' is passed to bison, discard all the debugging traces
 246 # preserving only the `parse errors'.  Note that since there should be
 247 # none, the `grep' will fail with exit status 1.
 248 AT_DEFINE([_AT_CHECK_CALC],
 249 [ifelse(regexp([$1], [--debug]),
 250   [-1],
 251      [AT_CHECK([echo "$2" | calc],
 252                [0], [], [])],
 253      [AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2],
 254                [1], [], [])])])
 255
 256
 257 # _AT_CHECK_CALC_ERROR(BISON-OPTIONS, INPUT,
 258 #                      [ERROR-LOCATION], [IF-YYERROR-VERBOSE])
 259 # ------------------------------------------------------------
 260 # Run `calc' on INPUT, and expect STDERR.
 261 AT_DEFINE([_AT_CHECK_CALC_ERROR],
 262 [AT_CHECK([echo "$2" | calc 2>&1 >/dev/null | grep 'parse error' >&2], 0,
 263           [],
 264 [ifelse(regexp([$1], [--location]),
 265         [-1], [], [$3: ])[]dnl
 266 parse error[]dnl
 267 ifelse(regexp([$1], [--yyerror-verbose]),
 268        [-1], [], [$4])[]dnl
 269
 270 ])])
 271
 272
 273 # AT_CHECK_CALC([BISON-OPTIONS], [PARSER-EXPECTED-STDERR])
 274 # --------------------------------------------------------
 275 # Start a testing chunk which compiles `calc' grammar with
 276 # BISON-OPTIONS, and performs several tests over the parser.
 277 AT_DEFINE([AT_CHECK_CALC],
 278 [# We use integers to avoid dependencies upon the precision of doubles.
 279 AT_SETUP([Calculator $1])
 280
 281 AT_DATA_CALC_Y([$1])
 282
 283 # Specify the output files to avoid problems on different file systems.
 284 AT_CHECK([bison calc.y -o calc.c patsubst([$1], [--yyerror-verbose])],
 285          [0], [], [])
 286 AT_CHECK([$CC $CFLAGS calc.c -o calc], 0, [], [])
 287
 288 # Test the priorities.
 289 _AT_CHECK_CALC([$1],
 290 [1 + 2 * 3 = 7
 291 1 + 2 * -3 = -5
 292
 293 -1^2 = -1
 294 (-1)^2 = 1
 295
 296 ---1 = -1
 297
 298 1 - 2 - 3 = -4
 299 1 - (2 - 3) = 2
 300
 301 2^2^3 = 256
 302 (2^2)^3 = 64], [$2])
 303
 304 # Some parse errors.
 305 _AT_CHECK_CALC_ERROR([$1], [+1],
 306                      [1.0:1.1],
 307                      [, unexpected `'+''])
 308 _AT_CHECK_CALC_ERROR([$1], [1//2],
 309                      [1.2:1.3],
 310                      [, unexpected `'/'', expecting `NUM' or `'-'' or `'(''])
 311 _AT_CHECK_CALC_ERROR([$1], [error],
 312                      [1.0:1.1],
 313                      [, unexpected `$undefined.'])
 314 _AT_CHECK_CALC_ERROR([$1], [1 = 2 = 3],
 315                      [1.6:1.7],
 316                      [, unexpected `'=''])
 317 _AT_CHECK_CALC_ERROR([$1],
 318                      [
 319 +1],
 320                      [2.0:2.1],
 321                      [, unexpected `'+''])
 322
 323 AT_CLEANUP(calc calc.c calc.h calc.output)
 324 ])# AT_CHECK_CALC
 325
 326
 327
 328
 329 # ------------------ #
 330 # Test the parsers.  #
 331 # ------------------ #
 332
 333 AT_CHECK_CALC()
 334
 335 AT_CHECK_CALC([--defines])
 336 AT_CHECK_CALC([--locations])
 337 AT_CHECK_CALC([--name-prefix=calc])
 338 AT_CHECK_CALC([--verbose])
 339 AT_CHECK_CALC([--yacc])
 340 AT_CHECK_CALC([--yyerror-verbose])
 341
 342 AT_CHECK_CALC([--locations --yyerror-verbose])
 343
 344 AT_CHECK_CALC([--defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])
 345
 346 AT_CHECK_CALC([--debug])
 347 AT_CHECK_CALC([--debug --defines --locations --name-prefix=calc --verbose --yacc --yyerror-verbose])