postgresql/contrib/seg/segparse.y
Tom Lane 043be9ad96 Make contrib/seg work with flex 2.5.31. Fix it up to have a real
btree operator class, too, since in PG 7.4 you can't GROUP without one.
2003-09-14 02:18:49 +00:00

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%{
#define YYPARSE_PARAM result /* need this to pass a pointer (void *) to yyparse */
#include "postgres.h"
#include <math.h>
#include "segdata.h"
#ifdef __CYGWIN__
#define HUGE HUGE_VAL
#endif /* __CYGWIN__ */
#undef yylex /* falure to redefine yylex will result in calling the */
#define yylex seg_yylex /* wrong scanner when running inside postgres backend */
extern int errno;
extern int yylex(); /* defined as seg_yylex in segscan.c */
extern int significant_digits( char *str ); /* defined in seg.c */
void seg_yyerror(const char *message);
int seg_yyparse( void *result );
float seg_atof( char *value );
long threshold;
char strbuf[25] = {
'0', '0', '0', '0', '0',
'0', '0', '0', '0', '0',
'0', '0', '0', '0', '0',
'0', '0', '0', '0', '0',
'0', '0', '0', '0', '\0'
};
%}
/* BISON Declarations */
%union {
struct BND {
float val;
char ext;
char sigd;
} bnd;
char * text;
}
%token <text> FLOAT
%token <text> RANGE
%token <text> PLUMIN
%token <text> EXTENSION
%type <bnd> boundary
%type <bnd> deviation
%start range
/* Grammar follows */
%%
range:
boundary PLUMIN deviation {
((SEG *)result)->lower = $1.val - $3.val;
((SEG *)result)->upper = $1.val + $3.val;
sprintf(strbuf, "%g", ((SEG *)result)->lower);
((SEG *)result)->l_sigd = Max(Min(6, significant_digits(strbuf)), Max($1.sigd, $3.sigd));
sprintf(strbuf, "%g", ((SEG *)result)->upper);
((SEG *)result)->u_sigd = Max(Min(6, significant_digits(strbuf)), Max($1.sigd, $3.sigd));
((SEG *)result)->l_ext = '\0';
((SEG *)result)->u_ext = '\0';
}
|
boundary RANGE boundary {
((SEG *)result)->lower = $1.val;
((SEG *)result)->upper = $3.val;
if ( ((SEG *)result)->lower > ((SEG *)result)->upper ) {
ereport(ERROR,
(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
errmsg("swapped boundaries: %g is greater than %g",
((SEG *)result)->lower, ((SEG *)result)->upper)));
YYERROR;
}
((SEG *)result)->l_sigd = $1.sigd;
((SEG *)result)->u_sigd = $3.sigd;
((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
((SEG *)result)->u_ext = ( $3.ext ? $3.ext : '\0' );
}
|
boundary RANGE {
((SEG *)result)->lower = $1.val;
((SEG *)result)->upper = HUGE;
((SEG *)result)->l_sigd = $1.sigd;
((SEG *)result)->u_sigd = 0;
((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
((SEG *)result)->u_ext = '-';
}
|
RANGE boundary {
((SEG *)result)->lower = -HUGE;
((SEG *)result)->upper = $2.val;
((SEG *)result)->l_sigd = 0;
((SEG *)result)->u_sigd = $2.sigd;
((SEG *)result)->l_ext = '-';
((SEG *)result)->u_ext = ( $2.ext ? $2.ext : '\0' );
}
|
boundary {
((SEG *)result)->lower = ((SEG *)result)->upper = $1.val;
((SEG *)result)->l_sigd = ((SEG *)result)->u_sigd = $1.sigd;
((SEG *)result)->l_ext = ((SEG *)result)->u_ext = ( $1.ext ? $1.ext : '\0' );
}
;
boundary:
FLOAT {
$$.ext = '\0';
$$.sigd = significant_digits($1);
$$.val = seg_atof($1);
}
|
EXTENSION FLOAT {
$$.ext = $1[0];
$$.sigd = significant_digits($2);
$$.val = seg_atof($2);
}
;
deviation:
FLOAT {
$$.ext = '\0';
$$.sigd = significant_digits($1);
$$.val = seg_atof($1);
}
;
%%
float seg_atof ( char *value ) {
float result;
char *buf = (char *) palloc(256);
errno = 0;
sscanf(value, "%f", &result);
if ( errno ) {
snprintf(buf, 256, "numeric value %s unrepresentable", value);
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("syntax error"),
errdetail("%s", buf)));
}
return result;
}
#include "segscan.c"