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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 "map.h" /* for TRUE/FALSE and REGEX includes */
#include "maptime.h" /* for time comparison routines */
extern int msyylex(void); /* lexer globals */
extern int msyyerror(const char *);
int msyyresult;
%}
/* Bison/Yacc declarations */
%union {
double dblval;
int intval;
char *strval;
struct tm tmval;
}
%token <dblval> NUMBER
%token <strval> STRING
%token <strval> ISTRING
%token <tmval> TIME
%token <strval> REGEX
%token <strval> IREGEX
%left OR
%left AND
%left NOT
%left RE EQ NE LT GT LE GE IN IEQ
%left LENGTH
%left '+' '-'
%left '*' '/' '%'
%left NEG
%right '^'
%type <intval> logical_exp
%type <dblval> math_exp
%type <strval> string_exp
%type <strval> regular_exp
%type <tmval> time_exp
/* Bison/Yacc grammar */
%%
input: /* empty string */
| logical_exp {
msyyresult = $1;
}
| math_exp {
if($1 != 0)
msyyresult = MS_TRUE;
else
msyyresult = MS_FALSE;
}
;
regular_exp: REGEX ;
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 regular_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
$$ = MS_FALSE;
ms_regfree(&re);
}
| math_exp EQ math_exp {
if($1 == $3)
$$ = 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;
}
| string_exp NE string_exp {
if(strcmp($1, $3) != 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp GT string_exp {
if(strcmp($1, $3) > 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp LT string_exp {
if(strcmp($1, $3) < 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp GE string_exp {
if(strcmp($1, $3) >= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| string_exp LE string_exp {
if(strcmp($1, $3) <= 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
| 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(strcmp($1,bufferp) == 0) // is this test necessary?
$$ = MS_TRUE;
}
| math_exp IN string_exp {
char *delim,*bufferp;
$$ = 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;
}
| 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;
}
| time_exp IEQ time_exp {
if(msTimeCompare(&($1), &($3)) == 0)
$$ = MS_TRUE;
else
$$ = MS_FALSE;
}
;
math_exp: NUMBER
| 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) {
msyyerror("division by zero");
return(-1);
} else
$$ = $1 / $3;
}
| '-' math_exp %prec NEG { $$ = $2; }
| math_exp '^' math_exp { $$ = pow($1, $3); }
| '(' math_exp ')' { $$ = $2; }
| LENGTH '(' string_exp ')' { $$ = strlen($3); }
;
string_exp: STRING
| '(' string_exp ')' { $$ = $2; }
| string_exp '+' string_exp { sprintf($$, "%s%s", $1, $3); }
;
time_exp: TIME
| '(' time_exp ')' { $$ = $2; }
;
%%
|
