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📄 README(142 B)
📁 btyacc
📄 btyacc_calc1.y(4.42 KB)
📄 btyacc_demo.y(6.55 KB)
📄 btyacc_destroy1.y(1.56 KB)
📄 btyacc_destroy2.y(1.56 KB)
📄 btyacc_destroy3.y(1.56 KB)
📄 calc.y(1.84 KB)
📄 calc1.y(4.22 KB)
📄 calc2.y(2.31 KB)
📄 calc3.y(2.37 KB)
📄 calc_code_all.y(2.07 KB)
📄 calc_code_default.y(1.92 KB)
📄 calc_code_imports.y(1.92 KB)
📄 calc_code_provides.y(1.92 KB)
📄 calc_code_requires.y(1.92 KB)
📄 calc_code_top.y(1.91 KB)
📄 code_calc.y(1.92 KB)
📄 code_debug.y(341 B)
📄 code_error.y(341 B)
📄 empty.y(290 B)
📄 err_inherit1.y(1.09 KB)
📄 err_inherit2.y(1.39 KB)
📄 err_inherit3.y(1.38 KB)
📄 err_inherit4.y(1.41 KB)
📄 err_inherit5.y(1.37 KB)
📄 err_syntax1.y(272 B)
📄 err_syntax10.y(323 B)
📄 err_syntax11.y(292 B)
📄 err_syntax12.y(303 B)
📄 err_syntax13.y(299 B)
📄 err_syntax14.y(296 B)
📄 err_syntax15.y(286 B)
📄 err_syntax16.y(330 B)
📄 err_syntax17.y(273 B)
📄 err_syntax18.y(319 B)
📄 err_syntax19.y(324 B)
📄 err_syntax2.y(272 B)
📄 err_syntax20.y(347 B)
📄 err_syntax21.y(355 B)
📄 err_syntax22.y(410 B)
📄 err_syntax23.y(418 B)
📄 err_syntax24.y(415 B)
📄 err_syntax25.y(454 B)
📄 err_syntax26.y(71 B)
📄 err_syntax27.y(2.36 KB)
📄 err_syntax3.y(296 B)
📄 err_syntax4.y(268 B)
📄 err_syntax5.y(301 B)
📄 err_syntax6.y(296 B)
📄 err_syntax7.y(292 B)
📄 err_syntax7a.y(293 B)
📄 err_syntax7b.y(291 B)
📄 err_syntax8.y(287 B)
📄 err_syntax8a.y(291 B)
📄 err_syntax9.y(307 B)
📄 error.y(269 B)
📄 expr.oxout.y(29.75 KB)
📄 grammar.y(26.98 KB)
📄 inherit0.y(797 B)
📄 inherit1.y(1.38 KB)
📄 inherit2.y(1.37 KB)
📄 ok_syntax1.y(2.92 KB)
📄 pure_calc.y(2.03 KB)
📄 pure_error.y(496 B)
📄 quote_calc.y(1.97 KB)
📄 quote_calc2.y(1.97 KB)
📄 quote_calc3.y(2.03 KB)
📄 quote_calc4.y(2.08 KB)
📄 run_lint.sh(509 B)
📄 run_make.sh(3.58 KB)
📄 run_test.sh(5.9 KB)
📄 varsyntax_calc1.y(4.48 KB)
📁 yacc

Editing: quote_calc3.y

%{
# include <stdio.h>
# include <ctype.h>

int regs[26];
int base;

int yylex(void);
static void yyerror(const char *s);

%start list

%token OP_ADD "ADD-operator"
%token OP_SUB "SUB-operator"
%token OP_MUL "MUL-operator"
%token OP_DIV "DIV-operator"
%token OP_MOD "MOD-operator"
%token OP_AND "AND-operator"

%token DIGIT LETTER

%left '|'
%left '&'
%left '+' '-'
%left '*' '/' '%'
%left UMINUS   /* supplies precedence for unary minus */

%% /* beginning of rules section */

list  :  /* empty */
      |  list stat '\n'
      |  list error '\n'
            {  yyerrok ; }
      ;

stat  :  expr
            {  printf("%d\n",$1);}
      |  LETTER '=' expr
            {  regs[$1] = $3; }
      ;

expr  :  '(' expr ')'
            {  $$ = $2; }
      |  expr OP_ADD expr
            {  $$ = $1 + $3; }
      |  expr OP_SUB expr
            {  $$ = $1 - $3; }
      |  expr OP_MUL expr
            {  $$ = $1 * $3; }
      |  expr OP_DIV expr
            {  $$ = $1 / $3; }
      |  expr OP_MOD expr
            {  $$ = $1 % $3; }
      |  expr OP_AND expr
            {  $$ = $1 & $3; }
      |  expr '|' expr
            {  $$ = $1 | $3; }
      |  OP_SUB expr %prec UMINUS
            {  $$ = - $2; }
      |  LETTER
            {  $$ = regs[$1]; }
      |  number
      ;

number:  DIGIT
         {  $$ = $1; base = ($1==0) ? 8 : 10; }
      |  number DIGIT
         {  $$ = base * $1 + $2; }
      ;

%% /* start of programs */

int
main (void)
{
    while(!feof(stdin)) {
	yyparse();
    }
    return 0;
}

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

int
yylex(void) {
	/* lexical analysis routine */
	/* returns LETTER for a lower case letter, yylval = 0 through 25 */
	/* return DIGIT for a digit, yylval = 0 through 9 */
	/* all other characters are returned immediately */

int c;

while( (c=getchar()) == ' ' )   { /* skip blanks */ }

/* c is now nonblank */

if( islower( c )) {
	yylval = c - 'a';
	return ( LETTER );
    }
    if( isdigit( c )) {
	yylval = c - '0';
	return ( DIGIT );
    }
    return( c );
}

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Editing: quote_calc3.y

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