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%{
/* contrib/cube/cubeparse.y */
/* NdBox = [(lowerleft),(upperright)] */
/* [(xLL(1)...xLL(N)),(xUR(1)...xUR(n))] */
#define YYSTYPE char *
#define YYDEBUG 1
#include "postgres.h"
#include "cubedata.h"
/*
* Bison doesn't allocate anything that needs to live across parser calls,
* so we can easily have it use palloc instead of malloc. This prevents
* memory leaks if we error out during parsing. Note this only works with
* bison >= 2.0. However, in bison 1.875 the default is to use alloca()
* if possible, so there's not really much problem anyhow, at least if
* you're building with gcc.
*/
#define YYMALLOC palloc
#define YYFREE pfree
extern int cube_yylex(void);
static char *scanbuf;
static int scanbuflen;
extern int cube_yyparse(NDBOX **result);
extern void cube_yyerror(NDBOX **result, const char *message);
static int delim_count(char *s, char delim);
static NDBOX * write_box(unsigned int dim, char *str1, char *str2);
static NDBOX * write_point_as_box(char *s, int dim);
%}
/* BISON Declarations */
%parse-param {NDBOX **result}
%expect 0
%name-prefix="cube_yy"
%token CUBEFLOAT O_PAREN C_PAREN O_BRACKET C_BRACKET COMMA
%start box
/* Grammar follows */
%%
box:
O_BRACKET paren_list COMMA paren_list C_BRACKET {
int dim;
dim = delim_count($2, ',') + 1;
if ( (delim_count($4, ',') + 1) != dim ) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("Different point dimensions in (%s) and (%s).",
$2, $4)));
YYABORT;
}
if (dim > CUBE_MAX_DIM) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("A cube cannot have more than %d dimensions.",
CUBE_MAX_DIM)));
YYABORT;
}
*result = write_box( dim, $2, $4 );
}
|
paren_list COMMA paren_list {
int dim;
dim = delim_count($1, ',') + 1;
if ( (delim_count($3, ',') + 1) != dim ) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("Different point dimensions in (%s) and (%s).",
$1, $3)));
YYABORT;
}
if (dim > CUBE_MAX_DIM) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("A cube cannot have more than %d dimensions.",
CUBE_MAX_DIM)));
YYABORT;
}
*result = write_box( dim, $1, $3 );
}
|
paren_list {
int dim;
dim = delim_count($1, ',') + 1;
if (dim > CUBE_MAX_DIM) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("A cube cannot have more than %d dimensions.",
CUBE_MAX_DIM)));
YYABORT;
}
*result = write_point_as_box($1, dim);
}
|
list {
int dim;
dim = delim_count($1, ',') + 1;
if (dim > CUBE_MAX_DIM) {
ereport(ERROR,
(errcode(ERRCODE_SYNTAX_ERROR),
errmsg("bad cube representation"),
errdetail("A cube cannot have more than %d dimensions.",
CUBE_MAX_DIM)));
YYABORT;
}
*result = write_point_as_box($1, dim);
}
;
paren_list:
O_PAREN list C_PAREN {
$$ = $2;
}
;
list:
CUBEFLOAT {
/* alloc enough space to be sure whole list will fit */
$$ = palloc(scanbuflen + 1);
strcpy($$, $1);
}
|
list COMMA CUBEFLOAT {
$$ = $1;
strcat($$, ",");
strcat($$, $3);
}
;
%%
static int
delim_count(char *s, char delim)
{
int ndelim = 0;
while ((s = strchr(s, delim)) != NULL)
{
ndelim++;
s++;
}
return (ndelim);
}
static NDBOX *
write_box(unsigned int dim, char *str1, char *str2)
{
NDBOX * bp;
char * s;
int i;
int size = offsetof(NDBOX, x[0]) + sizeof(double) * dim * 2;
bp = palloc0(size);
SET_VARSIZE(bp, size);
bp->dim = dim;
s = str1;
bp->x[i=0] = strtod(s, NULL);
while ((s = strchr(s, ',')) != NULL) {
s++; i++;
bp->x[i] = strtod(s, NULL);
}
s = str2;
bp->x[i=dim] = strtod(s, NULL);
while ((s = strchr(s, ',')) != NULL) {
s++; i++;
bp->x[i] = strtod(s, NULL);
}
return(bp);
}
static NDBOX *
write_point_as_box(char *str, int dim)
{
NDBOX * bp;
int i, size;
double x;
char * s = str;
size = offsetof(NDBOX, x[0]) + sizeof(double) * dim * 2;
bp = palloc0(size);
SET_VARSIZE(bp, size);
bp->dim = dim;
i = 0;
x = strtod(s, NULL);
bp->x[0] = x;
bp->x[dim] = x;
while ((s = strchr(s, ',')) != NULL) {
s++; i++;
x = strtod(s, NULL);
bp->x[i] = x;
bp->x[i+dim] = x;
}
return(bp);
}
#include "cubescan.c"
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