glr-regression.at

bison 2.0 主要可以用来做语法分析用的

# Checking GLR Parsing: Regression Tests           -*- Autotest -*-
# Copyright (C) 2002, 2003 Free Software Foundation, Inc.

# 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 2, 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
# 02111-1307, USA.

AT_BANNER([[GLR Regression Tests]])

## --------------------------- ##
## Badly Collapsed GLR States. ##
## --------------------------- ##

AT_SETUP([Badly Collapsed GLR States])

AT_DATA_GRAMMAR([glr-regr1.y],
[[/* Regression Test: Improper state compression */
/* Reported by Scott McPeak */

%{
#include <stdio.h>

#define YYSTYPE int
static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1);
int yylex (void);
int yyerror (char const *msg);
%}


%glr-parser


/* -------- productions ------ */
%%

StartSymbol: E  { $$=0; }                   %merge <exprMerge>
           ;

E: E 'P' E { $$=1; printf("E -> E 'P' E\n"); }  %merge <exprMerge>
 | 'B'     { $$=2; printf("E -> 'B'\n"); }      %merge <exprMerge>
 ;



/* ---------- C code ----------- */
%%

static YYSTYPE exprMerge (YYSTYPE x0, YYSTYPE x1)
{
  (void) x0;
  (void) x1;
  printf ("<OR>\n");
  return 0;
}

int
main (void)
{
  return yyparse ();
}

int
yyerror (char const *msg)
{
  fprintf (stderr, "%s\n", msg);
  exit (4);
}


int
yylex (void)
{
  for (;;)
    {
      int ch = getchar ();
      if (ch == EOF)
	return 0;
      else if (ch == 'B' || ch == 'P')
	return ch;
    }
}
]])

AT_CHECK([[bison -o glr-regr1.c glr-regr1.y]], 0, [],
[glr-regr1.y: conflicts: 1 shift/reduce
])
AT_COMPILE([glr-regr1])
AT_CHECK([[echo BPBPB | ./glr-regr1]], 0,
[[E -> 'B'
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> 'B'
E -> E 'P' E
E -> E 'P' E
<OR>
]], [])

AT_CLEANUP

## ------------------------------------------------------------ ##
## Improper handling of embedded actions and $-N in GLR parsers ##
## ------------------------------------------------------------ ##

AT_SETUP([Improper handling of embedded actions and $-N in GLR parsers])

AT_DATA_GRAMMAR([glr-regr2a.y],
[[/* Regression Test: Improper handling of embedded actions and $-N  */
/* Reported by S. Eken */

%{
  #define YYSTYPE char const *
  #define yyfalse 0
  #define yytrue 1

  #include <ctype.h>
  #include <stdio.h>
  #include <string.h>
  int yylex (void);
  void yyerror (char const *);
%}

%glr-parser

%%

command:
    's' var 't'
       { printf ("Variable: '%s'\n", $2); } 
    'v' 'x' 'q'
  | 's' var_list 't' 'e'
       { printf ("Varlist: '%s'\n", $2); }
  | 's' var 't' var_printer 'x'
  ;

var:
  'V'
     { $$ = $1; }
  ;

var_list:
  var
    { $$ = $1; }
  | var ',' var_list
    {
      char buffer[50];
      strcpy (buffer, $1); 
      strcat (buffer, ",");
      strcat (buffer, $3);
      $$ = strdup (buffer);
    }	
  ;

var_printer: 'v'
   { printf ("Variable: '%s'\n", $-1); }

%%

FILE *yyin = NULL;

int
yylex (void)
{ 
  char buf[50];
  switch (fscanf (yyin, " %1[a-z,]", buf)) {
  case 1:
    return buf[0];
  case EOF:
    return 0;
  default:
    break;
  }
  fscanf (yyin, "%s", buf);
  yylval = strdup (buf);
  return 'V';
}

void
yyerror (char const *s)
{ printf ("%s\n", s);
}

int
main (int argc, char **argv)
{ 
  yyin = stdin;
  if (argc == 2 && !(yyin = fopen (argv[1], "r"))) return 1;
  return yyparse ();
}
]])

AT_CHECK([[bison -o glr-regr2a.c glr-regr2a.y]], 0, [],
[glr-regr2a.y: conflicts: 2 shift/reduce
])
AT_COMPILE([glr-regr2a])

AT_CHECK([[echo s VARIABLE_1 t v x q | ./glr-regr2a]], 0,
[[Variable: 'VARIABLE_1'
]], [])
AT_CHECK([[echo s VARIABLE_1 , ANOTHER_VARIABLE_2 t e | ./glr-regr2a]], 0,
[[Varlist: 'VARIABLE_1,ANOTHER_VARIABLE_2'
]])
AT_CHECK([[echo s VARIABLE_3 t v x | ./glr-regr2a]], 0,
[[Variable: 'VARIABLE_3'
]], [])


AT_CLEANUP