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0c8de5b03c
Among all the modifications, this new byacc also solves a 14 year old bug [1] PR: bin/23254 [1] Submitted by: marka@nominum.com [1] MFC after: 3 weeks
156 lines
2.9 KiB
Plaintext
156 lines
2.9 KiB
Plaintext
%pure_parser
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%parse_param { int regs[26] }
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%parse_param { int *base }
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%lex_param { int *base }
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%{
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# include <stdio.h>
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# include <ctype.h>
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#ifdef YYBISON
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#define YYSTYPE int
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#define YYLEX_PARAM base
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#define YYLEX_DECL() yylex(YYSTYPE *yylval, int *YYLEX_PARAM)
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#define YYERROR_DECL() yyerror(int regs[26], int *base, const char *s)
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int YYLEX_DECL();
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static void YYERROR_DECL();
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#endif
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%}
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%start list
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%token DIGIT LETTER
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%token OCT1 '\177'
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%token HEX1 '\xff'
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%token HEX2 '\xFF'
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%token HEX3 '\x7f'
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%token STR1 "\x7f\177\\\n"
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%token STR2 "\x7f\
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\177\\\n"
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%token BELL '\a'
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%token BS '\b'
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%token NL '\n'
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%token LF '\f'
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%token CR '\r'
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%token TAB '\t'
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%token VT '\v'
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%union
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{
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char * cval;
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int ival;
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double dval;
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}
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%0 '@'
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%2 '~'
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%> '^'
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%< '#'
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%left '|'
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%left '&'
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%left '+' '-'
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%left '*' '/' '%'
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%left UMINUS /* supplies precedence for unary minus */
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%% /* beginning of rules section */
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list : /* empty */
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| list stat '\n'
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| list error '\n'
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{ yyerrok ; }
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;
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stat : expr
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{ printf("%d\n",$<ival>1);}
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| LETTER '=' expr
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{ regs[$<ival>1] = $<ival>3; }
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;
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expr : '(' expr ')'
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{ $<ival>$ = $<ival>2; }
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| expr '+' expr
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{ $<ival>$ = $<ival>1 + $<ival>3; }
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| expr '-' expr
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{ $<ival>$ = $<ival>1 - $<ival>3; }
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| expr '*' expr
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{ $<ival>$ = $<ival>1 * $<ival>3; }
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| expr '/' expr
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{ $<ival>$ = $<ival>1 / $<ival>3; }
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| expr '%' expr
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{ $<ival>$ = $<ival>1 % $<ival>3; }
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| expr '&' expr
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{ $<ival>$ = $<ival>1 & $<ival>3; }
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| expr '|' expr
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{ $<ival>$ = $<ival>1 | $<ival>3; }
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| '-' expr %prec UMINUS
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{ $<ival>$ = - $<ival>2; }
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| LETTER
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{ $<ival>$ = regs[$<ival>1]; }
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| number
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;
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number: DIGIT
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{ $<ival>$ = $<ival>1; (*base) = ($<ival>1==0) ? 8 : 10; }
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| number DIGIT
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{ $<ival>$ = (*base) * $<ival>1 + $<ival>2; }
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;
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%% /* start of programs */
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#ifdef YYBYACC
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extern int YYLEX_DECL();
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#endif
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int
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main (void)
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{
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int regs[26];
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int base = 10;
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while(!feof(stdin)) {
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yyparse(regs, &base);
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}
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return 0;
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}
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#define UNUSED(x) ((void)(x))
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static void
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YYERROR_DECL()
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{
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UNUSED(regs); /* %parse-param regs is not actually used here */
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UNUSED(base); /* %parse-param base is not actually used here */
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fprintf(stderr, "%s\n", s);
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}
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int
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YYLEX_DECL()
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{
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/* lexical analysis routine */
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/* returns LETTER for a lower case letter, yylval = 0 through 25 */
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/* return DIGIT for a digit, yylval = 0 through 9 */
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/* all other characters are returned immediately */
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int c;
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while( (c=getchar()) == ' ' ) { /* skip blanks */ }
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/* c is now nonblank */
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if( islower( c )) {
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yylval->ival = (c - 'a');
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return ( LETTER );
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}
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if( isdigit( c )) {
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yylval->ival = (c - '0') % (*base);
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return ( DIGIT );
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}
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return( c );
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}
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