163 lines
3.2 KiB
Plaintext
163 lines
3.2 KiB
Plaintext
%{
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/* contrib/seg/segparse.y */
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#include "postgres.h"
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#include <math.h>
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#include "fmgr.h"
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#include "utils/builtins.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. Note this only works with
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* bison >= 2.0. However, in bison 1.875 the default is to use alloca()
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* if possible, so there's not really much problem anyhow, at least if
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* you're building with gcc.
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*/
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#define YYMALLOC palloc
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#define YYFREE pfree
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static float seg_atof(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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%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(Min(6, significant_digits(strbuf)), Max($1.sigd, $3.sigd));
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sprintf(strbuf, "%g", result->upper);
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result->u_sigd = Max(Min(6, significant_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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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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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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| boundary
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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 = seg_atof($1);
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$$.ext = '\0';
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$$.sigd = significant_digits($1);
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$$.val = val;
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}
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| EXTENSION SEGFLOAT
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{
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/* temp variable avoids a gcc 3.3.x bug on Sparc64 */
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float val = seg_atof($2);
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$$.ext = $1[0];
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$$.sigd = significant_digits($2);
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$$.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 = seg_atof($1);
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$$.ext = '\0';
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$$.sigd = significant_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 float
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seg_atof(const char *value)
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{
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Datum datum;
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datum = DirectFunctionCall1(float4in, CStringGetDatum(value));
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return DatumGetFloat4(datum);
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}
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