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mapparser.y
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/*
** Parser for the mapserver
*/
%{
/* C declarations */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <time.h>
#include "mapserver.h" /* for TRUE/FALSE and REGEX includes */
#include "maptime.h" /* for time comparison routines */
#include "mapprimitive.h" /* for shapeObj */
#include "mapparser.h" /* for YYSTYPE in the function prototype for yylex() */
int yylex(YYSTYPE *, parseObj *); /* prototype functions, defined after the grammar */
int yyerror(parseObj *, const char *);
%}
/* Bison/Yacc declarations */
/* %define api.pure */
%pure_parser
%parse-param {parseObj *p}
%lex-param {parseObj *p}
%union {
double dblval;
int intval;
char *strval;
struct tm tmval;
shapeObj *shpval;
}
%token <dblval> NUMBER
%token <strval> STRING
%token <tmval> TIME
%token <shpval> SHAPE
%left OR
%left AND
%left NOT
%left RE EQ NE LT GT LE GE IN IEQ IRE
%left INTERSECTS DISJOINT TOUCHES OVERLAPS CROSSES WITHIN CONTAINS BEYOND DWITHIN
%left AREA LENGTH COMMIFY ROUND
%left TOSTRING
%left YYBUFFER DIFFERENCE SIMPLIFY SIMPLIFYPT GENERALIZE
%left '+' '-'
%left '*' '/' '%'
%left NEG
%right '^'
%type <intval> logical_exp
%type <dblval> math_exp
%type <strval> string_exp
%type <tmval> time_exp
%type <shpval> shape_exp
/* Bison/Yacc grammar */
%%
input: /* empty string */
| logical_exp {
switch(p->type) {
case(MS_PARSE_TYPE_BOOLEAN):
p->result.intval = $1;
break;
case(MS_PARSE_TYPE_STRING):
if($1)
p->result.strval = strdup("true");
else
p->result.strval = strdup("false");
break;
}
}
| math_exp {
switch(p->type) {
case(MS_PARSE_TYPE_BOOLEAN):
if($1 != 0)
p->result.intval = MS_TRUE;
else
p->result.intval = MS_FALSE;
break;
case(MS_PARSE_TYPE_STRING):
p->result.strval = (char *)malloc(64); /* large enough for a double */
snprintf(p->result.strval, 64, "%g", $1);
break;
}
}
| string_exp {
switch(p->type) {
case(MS_PARSE_TYPE_BOOLEAN):
if($1) /* string is not NULL */
p->result.intval = MS_TRUE;
else
p->result.intval = MS_FALSE;
break;
case(MS_PARSE_TYPE_STRING):
p->result.strval = $1; // strdup($1);
break;
}
}
| shape_exp {
switch(p->type) {
case(MS_PARSE_TYPE_SHAPE):
p->result.shpval = $1;
p->result.shpval->scratch = MS_FALSE;
break;
}
}
;
logical_exp:
logical_exp OR logical_exp {
if($1 == MS_TRUE)
$$ = MS_TRUE;
else if($3 == MS_TRUE)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| logical_exp AND logical_exp {
if($1 == MS_TRUE) {
if($3 == MS_TRUE)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
} else
$$ = MS_FALSE;
}
| logical_exp OR math_exp {
if($1 == MS_TRUE)
$$ = MS_TRUE;
else if($3 != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| logical_exp AND math_exp {
if($1 == MS_TRUE) {
if($3 != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
} else
$$ = MS_FALSE;
}
| math_exp OR logical_exp {
if($1 != 0)
$$ = MS_TRUE;
else if($3 == MS_TRUE)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp AND logical_exp {
if($1 != 0) {
if($3 == MS_TRUE)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
} else
$$ = MS_FALSE;
}
| math_exp OR math_exp {
if($1 != 0)
$$ = MS_TRUE;
else if($3 != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp AND math_exp {
if($1 != 0) {
if($3 != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
} else
$$ = MS_FALSE;
}
| NOT logical_exp { $$ = !$2; }
| NOT math_exp { $$ = !$2; }
| string_exp RE string_exp {
ms_regex_t re;
if(ms_regcomp(&re, $3, MS_REG_EXTENDED|MS_REG_NOSUB) != 0)
$$ = MS_FALSE;
if(ms_regexec(&re, $1, 0, NULL, 0) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
ms_regfree(&re);
free($1);
free($3);
}
| string_exp IRE string_exp {
ms_regex_t re;
if(ms_regcomp(&re, $3, MS_REG_EXTENDED|MS_REG_NOSUB|MS_REG_ICASE) != 0)
$$ = MS_FALSE;
if(ms_regexec(&re, $1, 0, NULL, 0) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
ms_regfree(&re);
free($1);
free($3);
}
| math_exp EQ math_exp {
if($1 == $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp NE math_exp {
if($1 != $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp GT math_exp {
if($1 > $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp LT math_exp {
if($1 < $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp GE math_exp {
if($1 >= $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| math_exp LE math_exp {
if($1 <= $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| '(' logical_exp ')' { $$ = $2; }
| string_exp EQ string_exp {
if(strcmp($1, $3) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| string_exp NE string_exp {
if(strcmp($1, $3) != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| string_exp GT string_exp {
if(strcmp($1, $3) > 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
/* printf("Not freeing: %s >= %s\n",$1, $3); */
free($1);
free($3);
}
| string_exp LT string_exp {
if(strcmp($1, $3) < 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| string_exp GE string_exp {
if(strcmp($1, $3) >= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| string_exp LE string_exp {
if(strcmp($1, $3) <= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| time_exp EQ time_exp {
if(msTimeCompare(&($1), &($3)) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| time_exp NE time_exp {
if(msTimeCompare(&($1), &($3)) != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| time_exp GT time_exp {
if(msTimeCompare(&($1), &($3)) > 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| time_exp LT time_exp {
if(msTimeCompare(&($1), &($3)) < 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| time_exp GE time_exp {
if(msTimeCompare(&($1), &($3)) >= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| time_exp LE time_exp {
if(msTimeCompare(&($1), &($3)) <= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp IN string_exp {
char *delim,*bufferp;
$$ = MS_FALSE;
bufferp=$3;
while((delim=strchr(bufferp,',')) != NULL) {
*delim='\0';
if(strcmp($1,bufferp) == 0) {
$$ = MS_TRUE;
break;
}
*delim=',';
bufferp=delim+1;
}
if($$==MS_FALSE && strcmp($1,bufferp) == 0) // test for last (or only) item
$$ = MS_TRUE;
free($1);
free($3);
}
| math_exp IN string_exp {
char *delim,*bufferp;
$$ = MS_FALSE;
bufferp=$3;
while((delim=strchr(bufferp,',')) != NULL) {
*delim='\0';
if($1 == atof(bufferp)) {
$$ = MS_TRUE;
break;
}
*delim=',';
bufferp=delim+1;
}
if($1 == atof(bufferp)) // is this test necessary?
$$ = MS_TRUE;
free($3);
}
| math_exp IEQ math_exp {
if($1 == $3)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp IEQ string_exp {
if(strcasecmp($1, $3) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
free($1);
free($3);
}
| time_exp IEQ time_exp {
if(msTimeCompare(&($1), &($3)) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| shape_exp EQ shape_exp {
int rval;
rval = msGEOSEquals($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Equals (EQ or ==) operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp INTERSECTS shape_exp {
int rval;
rval = msGEOSIntersects($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Intersects operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp DISJOINT shape_exp {
int rval;
rval = msGEOSDisjoint($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Disjoint operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp TOUCHES shape_exp {
int rval;
rval = msGEOSTouches($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Touches operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp OVERLAPS shape_exp {
int rval;
rval = msGEOSOverlaps($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Overlaps operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp CROSSES shape_exp {
int rval;
rval = msGEOSCrosses($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Crosses operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp WITHIN shape_exp {
int rval;
rval = msGEOSWithin($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Within operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp CONTAINS shape_exp {
int rval;
rval = msGEOSContains($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(rval == -1) {
yyerror(p, "Contains operator failed.");
return(-1);
} else
$$ = rval;
}
| shape_exp DWITHIN shape_exp {
double d;
d = msGEOSDistance($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(d == 0.0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| shape_exp BEYOND shape_exp {
double d;
d = msGEOSDistance($1, $3);
if($1->scratch == MS_TRUE) msFreeShape($1);
if($3->scratch == MS_TRUE) msFreeShape($3);
if(d > 0.0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
;
math_exp: NUMBER
| '(' math_exp ')' { $$ = $2; }
| math_exp '+' math_exp { $$ = $1 + $3; }
| math_exp '-' math_exp { $$ = $1 - $3; }
| math_exp '*' math_exp { $$ = $1 * $3; }
| math_exp '%' math_exp { $$ = (int)$1 % (int)$3; }
| math_exp '/' math_exp {
if($3 == 0.0) {
yyerror(p, "Division by zero.");
return(-1);
} else
$$ = $1 / $3;
}
| '-' math_exp %prec NEG { $$ = $2; }
| math_exp '^' math_exp { $$ = pow($1, $3); }
| LENGTH '(' string_exp ')' { $$ = strlen($3); }
| AREA '(' shape_exp ')' {
if($3->type != MS_SHAPE_POLYGON) {
yyerror(p, "Area can only be computed for polygon shapes.");
return(-1);
}
$$ = msGetPolygonArea($3);
if($3->scratch == MS_TRUE) msFreeShape($3);
}
| ROUND '(' math_exp ',' math_exp ')' { $$ = (MS_NINT($3/$5))*$5; }
;
shape_exp: SHAPE
| '(' shape_exp ')' { $$ = $2; }
| YYBUFFER '(' shape_exp ',' math_exp ')' {
shapeObj *s;
s = msGEOSBuffer($3, $5);
if(!s) {
yyerror(p, "Executing buffer failed.");
return(-1);
}
s->scratch = MS_TRUE;
$$ = s;
}
| DIFFERENCE '(' shape_exp ',' shape_exp ')' {
shapeObj *s;
s = msGEOSDifference($3, $5);
if(!s) {
yyerror(p, "Executing difference failed.");
return(-1);
}
s->scratch = MS_TRUE;
$$ = s;
}
| SIMPLIFY '(' shape_exp ',' math_exp ')' {
shapeObj *s;
s = msGEOSSimplify($3, $5);
if(!s) {
yyerror(p, "Executing simplify failed.");
return(-1);
}
s->scratch = MS_TRUE;
$$ = s;
}
| SIMPLIFYPT '(' shape_exp ',' math_exp ')' {
shapeObj *s;
s = msGEOSTopologyPreservingSimplify($3, $5);
if(!s) {
yyerror(p, "Executing simplifypt failed.");
return(-1);
}
s->scratch = MS_TRUE;
$$ = s;
}
| GENERALIZE '(' shape_exp ',' math_exp ')' {
shapeObj *s;
s = msGeneralize($3, $5);
if(!s) {
yyerror(p, "Executing generalize failed.");
return(-1);
}
s->scratch = MS_TRUE;
$$ = s;
}
;
string_exp: STRING
| '(' string_exp ')' { $$ = $2; }
| string_exp '+' string_exp {
$$ = (char *)malloc(strlen($1) + strlen($3) + 1);
sprintf($$, "%s%s", $1, $3); free($1); free($3);
}
| TOSTRING '(' math_exp ',' string_exp ')' {
$$ = (char *) malloc(strlen($5) + 64); /* Plenty big? Should use snprintf below... */
sprintf($$, $5, $3);
}
| COMMIFY '(' string_exp ')' {
$3 = msCommifyString($3);
$$ = $3;
}
;
time_exp: TIME
| '(' time_exp ')' { $$ = $2; }
;
%%
/*
** Any extra C functions
*/
int yylex(YYSTYPE *lvalp, parseObj *p)
{
int token;
if(p->expr->curtoken == NULL) return(0); /* done */
// fprintf(stderr, "in yylex() - curtoken=%d...\n", p->expr->curtoken->token);
token = p->expr->curtoken->token; /* may override */
switch(p->expr->curtoken->token) {
case MS_TOKEN_LITERAL_NUMBER:
token = NUMBER;
(*lvalp).dblval = p->expr->curtoken->tokenval.dblval;
break;
case MS_TOKEN_LITERAL_SHAPE:
token = SHAPE;
// fprintf(stderr, "token value = %s\n", msShapeToWKT(p->expr->curtoken->tokenval.shpval));
(*lvalp).shpval = p->expr->curtoken->tokenval.shpval;
break;
case MS_TOKEN_LITERAL_STRING:
// printf("token value = %s\n", p->expr->curtoken->tokenval.strval);
token = STRING;
(*lvalp).strval = strdup(p->expr->curtoken->tokenval.strval);
break;
case MS_TOKEN_LITERAL_TIME:
token = TIME;
(*lvalp).tmval = p->expr->curtoken->tokenval.tmval;
break;
case MS_TOKEN_COMPARISON_EQ: token = EQ; break;
case MS_TOKEN_COMPARISON_IEQ: token = IEQ; break;
case MS_TOKEN_COMPARISON_NE: token = NE; break;
case MS_TOKEN_COMPARISON_LT: token = LT; break;
case MS_TOKEN_COMPARISON_GT: token = GT; break;
case MS_TOKEN_COMPARISON_LE: token = LE; break;
case MS_TOKEN_COMPARISON_GE: token = GE; break;
case MS_TOKEN_COMPARISON_RE: token = RE; break;
case MS_TOKEN_COMPARISON_IRE: token = IRE; break;
case MS_TOKEN_COMPARISON_INTERSECTS: token = INTERSECTS; break;
case MS_TOKEN_COMPARISON_DISJOINT: token = DISJOINT; break;
case MS_TOKEN_COMPARISON_TOUCHES: token = TOUCHES; break;
case MS_TOKEN_COMPARISON_OVERLAPS: token = OVERLAPS; break;
case MS_TOKEN_COMPARISON_CROSSES: token = CROSSES; break;
case MS_TOKEN_COMPARISON_WITHIN: token = WITHIN; break;
case MS_TOKEN_COMPARISON_CONTAINS: token = CONTAINS; break;
case MS_TOKEN_COMPARISON_BEYOND: token = BEYOND; break;
case MS_TOKEN_COMPARISON_DWITHIN: token = DWITHIN; break;
case MS_TOKEN_LOGICAL_AND: token = AND; break;
case MS_TOKEN_LOGICAL_OR: token = OR; break;
case MS_TOKEN_LOGICAL_NOT: token = NOT; break;
case MS_TOKEN_BINDING_DOUBLE:
case MS_TOKEN_BINDING_INTEGER:
token = NUMBER;
(*lvalp).dblval = atof(p->shape->values[p->expr->curtoken->tokenval.bindval.index]);
break;
case MS_TOKEN_BINDING_STRING:
token = STRING;
(*lvalp).strval = strdup(p->shape->values[p->expr->curtoken->tokenval.bindval.index]);
break;
case MS_TOKEN_BINDING_SHAPE:
token = SHAPE;
// fprintf(stderr, "token value = %s\n", msShapeToWKT(p->shape));
(*lvalp).shpval = p->shape;
break;
case MS_TOKEN_BINDING_MAP_CELLSIZE:
token = NUMBER;
(*lvalp).dblval = p->dblval;
break;
case MS_TOKEN_BINDING_TIME:
token = TIME;
msTimeInit(&((*lvalp).tmval));
if(msParseTime(p->shape->values[p->expr->curtoken->tokenval.bindval.index], &((*lvalp).tmval)) != MS_TRUE) {
yyerror(p, "Parsing time value failed.");
return(-1);
}
break;
case MS_TOKEN_FUNCTION_AREA: token = AREA; break;
case MS_TOKEN_FUNCTION_LENGTH: token = LENGTH; break;
case MS_TOKEN_FUNCTION_TOSTRING: token = TOSTRING; break;
case MS_TOKEN_FUNCTION_COMMIFY: token = COMMIFY; break;
case MS_TOKEN_FUNCTION_ROUND: token = ROUND; break;
case MS_TOKEN_FUNCTION_BUFFER: token = YYBUFFER; break;
case MS_TOKEN_FUNCTION_DIFFERENCE: token = DIFFERENCE; break;
case MS_TOKEN_FUNCTION_SIMPLIFY: token = SIMPLIFY; break;
case MS_TOKEN_FUNCTION_SIMPLIFYPT: token = SIMPLIFYPT; break;
case MS_TOKEN_FUNCTION_GENERALIZE: token = GENERALIZE; break;
default:
break;
}
p->expr->curtoken = p->expr->curtoken->next; /* re-position */
return(token);
}
int yyerror(parseObj *p, const char *s) {
msSetError(MS_PARSEERR, s, "yyparse()");
return(0);
}