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%{
/* NdBox = [(lowerleft),(upperright)] */
/* [(xLL(1)...xLL(N)),(xUR(1)...xUR(n))] */
#define YYPARSE_PARAM result /* need this to pass a pointer (void *) to yyparse */
#define YYSTYPE char *
#define YYDEBUG 1
#include "postgres.h"
#include "cubedata.h"
#include "buffer.h"
#include "utils/palloc.h"
#include "utils/elog.h"
#undef yylex /* falure to redefine yylex will result in a call to the */
#define yylex cube_yylex /* wrong scanner when running inside the postgres backend */
extern int yylex(); /* defined as cube_yylex in cubescan.c */
extern int errno;
int cube_yyerror( char *msg );
int cube_yyparse(void *result);
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 */
%token FLOAT 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;
int c = parse_buffer_curr_char();
int pos = parse_buffer_pos();
/* We can't let the parser recognize more than one valid expression:
the job is done and memory is allocated. */
if ( c != '\0' ) {
/* Not at EOF */
reset_parse_buffer();
elog(ERROR, "(0) bad cube representation; garbage at or before char %d, ('%c', \\%03o)\n", pos, c, c );
YYERROR;
}
dim = delim_count($2, ',') + 1;
if ( (delim_count($4, ',') + 1) != dim ) {
reset_parse_buffer();
elog(ERROR, "(1) bad cube representation; different point dimensions in (%s) and (%s)\n", $2, $4);
YYABORT;
}
if (dim > CUBE_MAX_DIM) {
reset_parse_buffer();
elog(ERROR, "(8) bad cube representation; more than %d dimensions\n", CUBE_MAX_DIM);
YYABORT;
}
*((void **)result) = write_box( dim, $2, $4 );
}
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paren_list COMMA paren_list {
int dim;
int c = parse_buffer_curr_char();
int pos = parse_buffer_pos();
if ( c != '\0' ) { /* Not at EOF */
reset_parse_buffer();
elog(ERROR, "(2) bad cube representation; garbage at or before char %d, ('%c', \\%03o)\n", pos, c, c );
YYABORT;
}
dim = delim_count($1, ',') + 1;
if ( (delim_count($3, ',') + 1) != dim ) {
reset_parse_buffer();
elog(ERROR, "(3) bad cube representation; different point dimensions in (%s) and (%s)\n", $1, $3);
YYABORT;
}
if (dim > CUBE_MAX_DIM) {
reset_parse_buffer();
elog(ERROR, "(8) bad cube representation; more than %d dimensions\n", CUBE_MAX_DIM);
YYABORT;
}
*((void **)result) = write_box( dim, $1, $3 );
}
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paren_list {
int dim;
int c = parse_buffer_curr_char();
int pos = parse_buffer_pos();
if ( c != '\0') { /* Not at EOF */
reset_parse_buffer();
elog(ERROR, "(4) bad cube representation; garbage at or before char %d, ('%c', \\%03o)\n", pos, c, c );
YYABORT;
}
if ( yychar != YYEOF) {
/* There's still a lookahead token to be parsed */
reset_parse_buffer();
elog(ERROR, "(5) bad cube representation; garbage at or before char %d, ('end of input', \\%03o)\n", pos, c);
YYABORT;
}
dim = delim_count($1, ',') + 1;
if (dim > CUBE_MAX_DIM) {
reset_parse_buffer();
elog(ERROR, "(8) bad cube representation; more than %d dimensions\n", CUBE_MAX_DIM);
YYABORT;
}
*((void **)result) = write_point_as_box($1, dim);
}
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list {
int dim;
int c = parse_buffer_curr_char();
int pos = parse_buffer_pos();
if ( c != '\0') { /* Not at EOF */
reset_parse_buffer();
elog(ERROR, "(6) bad cube representation; garbage at or before char %d, ('%c', \\%03o)\n", pos, c, c);
YYABORT;
}
if ( yychar != YYEOF) {
/* There's still a lookahead token to be parsed */
reset_parse_buffer();
elog(ERROR, "(7) bad cube representation; garbage at or before char %d, ('end of input', \\%03o)\n", pos, c);
YYABORT;
}
dim = delim_count($1, ',') + 1;
if (dim > CUBE_MAX_DIM) {
reset_parse_buffer();
elog(ERROR, "(8) bad cube representation; more than %d dimensions\n", CUBE_MAX_DIM);
YYABORT;
}
*((void **)result) = write_point_as_box($1, dim);
}
;
paren_list:
O_PAREN list C_PAREN {
$$ = $2;
}
;
list:
FLOAT {
$$ = palloc(strlen(parse_buffer()) + 1);
strcpy($$, $1);
}
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list COMMA FLOAT {
$$ = $1;
strcat($$, ",");
strcat($$, $3);
}
;
%%
int cube_yyerror ( char *msg ) {
char *buf = (char *) palloc(256);
int position;
yyclearin;
if ( !strcmp(msg, "parse error, expecting `$'") ) {
msg = "expecting end of input";
}
position = parse_buffer_pos() > parse_buffer_size() ? parse_buffer_pos() - 1 : parse_buffer_pos();
snprintf(
buf,
256,
"%s at or before position %d, character ('%c', \\%03o), input: '%s'\n",
msg,
position,
parse_buffer()[position - 1],
parse_buffer()[position - 1],
parse_buffer()
);
reset_parse_buffer();
elog(ERROR, "%s", buf);
return 0;
}
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 = palloc(size);
memset(bp, 0, size);
bp->size = 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 = palloc(size);
memset(bp, 0, size);
bp->size = 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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