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Diffstat (limited to 'usr.bin/yacc/tests/calc1.y')
| -rw-r--r-- | usr.bin/yacc/tests/calc1.y | 305 |
1 files changed, 0 insertions, 305 deletions
diff --git a/usr.bin/yacc/tests/calc1.y b/usr.bin/yacc/tests/calc1.y deleted file mode 100644 index ec89736..0000000 --- a/usr.bin/yacc/tests/calc1.y +++ /dev/null @@ -1,305 +0,0 @@ -%{ - -/* http://dinosaur.compilertools.net/yacc/index.html */ - -#include <stdlib.h> -#include <stdio.h> -#include <ctype.h> -#include <math.h> - -typedef struct interval -{ - double lo, hi; -} -INTERVAL; - -INTERVAL vmul(double, double, INTERVAL); -INTERVAL vdiv(double, double, INTERVAL); - -extern int yylex(void); -static void yyerror(const char *s); - -int dcheck(INTERVAL); - -double dreg[26]; -INTERVAL vreg[26]; - -%} -%expect 18 - -%start line -%union -{ - int ival; - double dval; - INTERVAL vval; -} - -%token <ival> DREG VREG /* indices into dreg, vreg arrays */ -%token <dval> CONST /* floating point constant */ - -%type <dval> dexp /* expression */ -%type <vval> vexp /* interval expression */ - - /* precedence information about the operators */ - -%left '+' '-' -%left '*' '/' -%left UMINUS /* precedence for unary minus */ - -%% /* beginning of rules section */ - -lines : /* empty */ - | lines line - ; - -line : dexp '\n' - { - (void) printf("%15.8f\n", $1); - } - | vexp '\n' - { - (void) printf("(%15.8f, %15.8f)\n", $1.lo, $1.hi); - } - | DREG '=' dexp '\n' - { - dreg[$1] = $3; - } - | VREG '=' vexp '\n' - { - vreg[$1] = $3; - } - | error '\n' - { - yyerrok; - } - ; - -dexp : CONST - | DREG - { - $$ = dreg[$1]; - } - | dexp '+' dexp - { - $$ = $1 + $3; - } - | dexp '-' dexp - { - $$ = $1 - $3; - } - | dexp '*' dexp - { - $$ = $1 * $3; - } - | dexp '/' dexp - { - $$ = $1 / $3; - } - | '-' dexp %prec UMINUS - { - $$ = -$2; - } - | '(' dexp ')' - { - $$ = $2; - } - ; - -vexp : dexp - { - $$.hi = $$.lo = $1; - } - | '(' dexp ',' dexp ')' - { - $$.lo = $2; - $$.hi = $4; - if ( $$.lo > $$.hi ) - { - (void) printf("interval out of order\n"); - YYERROR; - } - } - | VREG - { - $$ = vreg[$1]; - } - | vexp '+' vexp - { - $$.hi = $1.hi + $3.hi; - $$.lo = $1.lo + $3.lo; - } - | dexp '+' vexp - { - $$.hi = $1 + $3.hi; - $$.lo = $1 + $3.lo; - } - | vexp '-' vexp - { - $$.hi = $1.hi - $3.lo; - $$.lo = $1.lo - $3.hi; - } - | dexp '-' vexp - { - $$.hi = $1 - $3.lo; - $$.lo = $1 - $3.hi; - } - | vexp '*' vexp - { - $$ = vmul( $1.lo, $1.hi, $3 ); - } - | dexp '*' vexp - { - $$ = vmul ($1, $1, $3 ); - } - | vexp '/' vexp - { - if (dcheck($3)) YYERROR; - $$ = vdiv ( $1.lo, $1.hi, $3 ); - } - | dexp '/' vexp - { - if (dcheck ( $3 )) YYERROR; - $$ = vdiv ($1, $1, $3 ); - } - | '-' vexp %prec UMINUS - { - $$.hi = -$2.lo; - $$.lo = -$2.hi; - } - | '(' vexp ')' - { - $$ = $2; - } - ; - -%% /* beginning of subroutines section */ - -#define BSZ 50 /* buffer size for floating point numbers */ - - /* lexical analysis */ - -static void -yyerror(const char *s) -{ - fprintf(stderr, "%s\n", s); -} - -int -yylex(void) -{ - int c; - - while ((c = getchar()) == ' ') - { /* skip over blanks */ - } - - if (isupper(c)) - { - yylval.ival = c - 'A'; - return (VREG); - } - if (islower(c)) - { - yylval.ival = c - 'a'; - return (DREG); - } - - if (isdigit(c) || c == '.') - { - /* gobble up digits, points, exponents */ - char buf[BSZ + 1], *cp = buf; - int dot = 0, expr = 0; - - for (; (cp - buf) < BSZ; ++cp, c = getchar()) - { - - *cp = c; - if (isdigit(c)) - continue; - if (c == '.') - { - if (dot++ || expr) - return ('.'); /* will cause syntax error */ - continue; - } - - if (c == 'e') - { - if (expr++) - return ('e'); /* will cause syntax error */ - continue; - } - - /* end of number */ - break; - } - *cp = '\0'; - - if ((cp - buf) >= BSZ) - printf("constant too long: truncated\n"); - else - ungetc(c, stdin); /* push back last char read */ - yylval.dval = atof(buf); - return (CONST); - } - return (c); -} - -static INTERVAL -hilo(double a, double b, double c, double d) -{ - /* returns the smallest interval containing a, b, c, and d */ - /* used by *, / routines */ - INTERVAL v; - - if (a > b) - { - v.hi = a; - v.lo = b; - } - else - { - v.hi = b; - v.lo = a; - } - - if (c > d) - { - if (c > v.hi) - v.hi = c; - if (d < v.lo) - v.lo = d; - } - else - { - if (d > v.hi) - v.hi = d; - if (c < v.lo) - v.lo = c; - } - return (v); -} - -INTERVAL -vmul(double a, double b, INTERVAL v) -{ - return (hilo(a * v.hi, a * v.lo, b * v.hi, b * v.lo)); -} - -int -dcheck(INTERVAL v) -{ - if (v.hi >= 0. && v.lo <= 0.) - { - printf("divisor interval contains 0.\n"); - return (1); - } - return (0); -} - -INTERVAL -vdiv(double a, double b, INTERVAL v) -{ - return (hilo(a / v.hi, a / v.lo, b / v.hi, b / v.lo)); -} |
