mirror of
https://git.postgresql.org/git/postgresql.git
synced 2024-08-28 01:37:18 +02:00
Reviewed by Tom Lane Discussion: https://postgr.es/m/a8dc5700-c341-3ba8-0507-cc09881e6200@dunslane.net
184 lines
3.5 KiB
Plaintext
184 lines
3.5 KiB
Plaintext
%{
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/* contrib/seg/segparse.y */
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#include "postgres.h"
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#include <float.h>
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#include <math.h>
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#include "fmgr.h"
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#include "nodes/miscnodes.h"
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#include "utils/builtins.h"
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#include "utils/float.h"
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#include "segdata.h"
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/*
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* Bison doesn't allocate anything that needs to live across parser calls,
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* so we can easily have it use palloc instead of malloc. This prevents
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* memory leaks if we error out during parsing.
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*/
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#define YYMALLOC palloc
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#define YYFREE pfree
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static bool seg_atof(char *value, float *result, struct Node *escontext);
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static int sig_digits(const char *value);
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static 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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%parse-param {SEG *result}
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%parse-param {struct Node *escontext}
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%expect 0
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%name-prefix="seg_yy"
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%union
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{
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struct BND
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{
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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> SEGFLOAT
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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: boundary PLUMIN deviation
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{
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result->lower = $1.val - $3.val;
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result->upper = $1.val + $3.val;
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sprintf(strbuf, "%g", result->lower);
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result->l_sigd = Max(sig_digits(strbuf), Max($1.sigd, $3.sigd));
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sprintf(strbuf, "%g", result->upper);
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result->u_sigd = Max(sig_digits(strbuf), Max($1.sigd, $3.sigd));
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result->l_ext = '\0';
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result->u_ext = '\0';
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}
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| boundary RANGE boundary
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{
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result->lower = $1.val;
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result->upper = $3.val;
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if ( result->lower > result->upper ) {
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errsave(escontext,
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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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result->lower, result->upper)));
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YYERROR;
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}
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result->l_sigd = $1.sigd;
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result->u_sigd = $3.sigd;
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result->l_ext = ( $1.ext ? $1.ext : '\0' );
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result->u_ext = ( $3.ext ? $3.ext : '\0' );
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}
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| boundary RANGE
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{
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result->lower = $1.val;
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result->upper = HUGE_VAL;
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result->l_sigd = $1.sigd;
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result->u_sigd = 0;
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result->l_ext = ( $1.ext ? $1.ext : '\0' );
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result->u_ext = '-';
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}
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| RANGE boundary
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{
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result->lower = -HUGE_VAL;
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result->upper = $2.val;
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result->l_sigd = 0;
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result->u_sigd = $2.sigd;
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result->l_ext = '-';
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result->u_ext = ( $2.ext ? $2.ext : '\0' );
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}
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{
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result->lower = result->upper = $1.val;
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result->l_sigd = result->u_sigd = $1.sigd;
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result->l_ext = result->u_ext = ( $1.ext ? $1.ext : '\0' );
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}
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;
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boundary: SEGFLOAT
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{
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/* temp variable avoids a gcc 3.3.x bug on Sparc64 */
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float val;
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if (!seg_atof($1, &val, escontext))
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YYABORT;
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$$.ext = '\0';
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$$.sigd = sig_digits($1);
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$$.val = val;
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}
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| EXTENSION SEGFLOAT
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{
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/* temp variable avoids a gcc 3.3.x bug on Sparc64 */
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float val;
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if (!seg_atof($2, &val, escontext))
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YYABORT;
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$$.ext = $1[0];
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$$.sigd = sig_digits($2);
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$$.val = val;
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}
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;
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deviation: SEGFLOAT
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{
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/* temp variable avoids a gcc 3.3.x bug on Sparc64 */
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float val;
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if (!seg_atof($1, &val, escontext))
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YYABORT;
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$$.ext = '\0';
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$$.sigd = sig_digits($1);
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$$.val = val;
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}
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;
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%%
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static bool
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seg_atof(char *value, float *result, struct Node *escontext)
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{
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*result = float4in_internal(value, NULL, "seg", value, escontext);
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if (SOFT_ERROR_OCCURRED(escontext))
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return false;
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return true;
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}
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static int
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sig_digits(const char *value)
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{
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int n = significant_digits(value);
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/* Clamp, to ensure value will fit in sigd fields */
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return Min(n, FLT_DIG);
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}
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