mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-12-21 08:29:39 +08:00
157 lines
3.9 KiB
Plaintext
157 lines
3.9 KiB
Plaintext
%{
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#define YYPARSE_PARAM result /* need this to pass a pointer (void *) to yyparse */
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#include "postgres.h"
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#include <math.h>
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#include "segdata.h"
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#ifdef __CYGWIN__
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#define HUGE HUGE_VAL
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#endif /* __CYGWIN__ */
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#undef yylex /* falure to redefine yylex will result in calling the */
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#define yylex seg_yylex /* wrong scanner when running inside postgres backend */
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extern int errno;
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extern int yylex(); /* defined as seg_yylex in segscan.c */
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extern int significant_digits( char *str ); /* defined in seg.c */
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void seg_yyerror(const char *message);
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int seg_yyparse( void *result );
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float seg_atof( char *value );
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long threshold;
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char strbuf[25] = {
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'0', '0', '0', '0', '0',
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'0', '0', '0', '0', '0',
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'0', '0', '0', '0', '0',
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'0', '0', '0', '0', '0',
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'0', '0', '0', '0', '\0'
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};
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%}
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/* BISON Declarations */
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%union {
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struct BND {
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float val;
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char ext;
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char sigd;
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} bnd;
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char * text;
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}
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%token <text> FLOAT
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%token <text> RANGE
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%token <text> PLUMIN
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%token <text> EXTENSION
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%type <bnd> boundary
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%type <bnd> deviation
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%start range
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/* Grammar follows */
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%%
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range:
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boundary PLUMIN deviation {
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((SEG *)result)->lower = $1.val - $3.val;
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((SEG *)result)->upper = $1.val + $3.val;
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sprintf(strbuf, "%g", ((SEG *)result)->lower);
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((SEG *)result)->l_sigd = Max(Min(6, significant_digits(strbuf)), Max($1.sigd, $3.sigd));
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sprintf(strbuf, "%g", ((SEG *)result)->upper);
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((SEG *)result)->u_sigd = Max(Min(6, significant_digits(strbuf)), Max($1.sigd, $3.sigd));
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((SEG *)result)->l_ext = '\0';
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((SEG *)result)->u_ext = '\0';
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}
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boundary RANGE boundary {
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((SEG *)result)->lower = $1.val;
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((SEG *)result)->upper = $3.val;
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if ( ((SEG *)result)->lower > ((SEG *)result)->upper ) {
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ereport(ERROR,
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(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
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errmsg("swapped boundaries: %g is greater than %g",
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((SEG *)result)->lower, ((SEG *)result)->upper)));
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YYERROR;
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}
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((SEG *)result)->l_sigd = $1.sigd;
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((SEG *)result)->u_sigd = $3.sigd;
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((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
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((SEG *)result)->u_ext = ( $3.ext ? $3.ext : '\0' );
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}
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boundary RANGE {
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((SEG *)result)->lower = $1.val;
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((SEG *)result)->upper = HUGE;
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((SEG *)result)->l_sigd = $1.sigd;
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((SEG *)result)->u_sigd = 0;
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((SEG *)result)->l_ext = ( $1.ext ? $1.ext : '\0' );
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((SEG *)result)->u_ext = '-';
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}
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RANGE boundary {
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((SEG *)result)->lower = -HUGE;
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((SEG *)result)->upper = $2.val;
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((SEG *)result)->l_sigd = 0;
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((SEG *)result)->u_sigd = $2.sigd;
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((SEG *)result)->l_ext = '-';
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((SEG *)result)->u_ext = ( $2.ext ? $2.ext : '\0' );
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}
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boundary {
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((SEG *)result)->lower = ((SEG *)result)->upper = $1.val;
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((SEG *)result)->l_sigd = ((SEG *)result)->u_sigd = $1.sigd;
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((SEG *)result)->l_ext = ((SEG *)result)->u_ext = ( $1.ext ? $1.ext : '\0' );
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}
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;
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boundary:
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FLOAT {
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$$.ext = '\0';
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$$.sigd = significant_digits($1);
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$$.val = seg_atof($1);
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}
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EXTENSION FLOAT {
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$$.ext = $1[0];
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$$.sigd = significant_digits($2);
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$$.val = seg_atof($2);
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}
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;
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deviation:
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FLOAT {
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$$.ext = '\0';
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$$.sigd = significant_digits($1);
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$$.val = seg_atof($1);
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}
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;
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%%
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float seg_atof ( char *value ) {
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float result;
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char *buf = (char *) palloc(256);
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errno = 0;
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sscanf(value, "%f", &result);
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if ( errno ) {
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snprintf(buf, 256, "numeric value %s unrepresentable", value);
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ereport(ERROR,
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(errcode(ERRCODE_SYNTAX_ERROR),
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errmsg("syntax error"),
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errdetail("%s", buf)));
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}
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return result;
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}
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#include "segscan.c"
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