From c2d0c3d4c31164ece386a61ef3326bb40c348fdb Mon Sep 17 00:00:00 2001 From: Rainer Gerhards Date: Wed, 20 Feb 2008 15:43:55 +0000 Subject: - added "contains" and "startwith" comparison operations - defined initial set of opcodes --- doc/expression.html | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'doc/expression.html') diff --git a/doc/expression.html b/doc/expression.html index 6298b74a..58401a1b 100644 --- a/doc/expression.html +++ b/doc/expression.html @@ -11,7 +11,7 @@ far, they are supported for filtering messages.

C-like comments (/* some c

Formal Definition

Below is the formal definition of expression format (in ABNF, RFC 2234):
-

if_stmt  := "if" expr "then"  # an aid, not part of expression itself

expr     := e_and *("or" e_and)
e_and    := e_cmp *("and" e_cmp)
e_cmp    := val 0*1(cmp_op val)
val      := ["+" / "-"] term *(("+" / "-") term)
term     := factor *(("*" / "/" / "%") factor)
factor   := ["not"] terminal
terminal := var / constant / function / "(" expr ")"
function := name "(" *("," expr) ")"
var      := "$" varname
varname  := msgvar / sysvar
msgvar   := name
sysvar   := "$" name
name     := alpha *(alnum)
constant := string / number
string   := simpstr / tplstr ; tplstr will be implemented in next phase
simpstr  := "'" *char "'"    ; use your imagination for char ;)
tplstr   := '"' template '"' ; not initially implemented
number   := 1*digit ; 0nn = octal, 0xnn = hex, nn = decimal
cmp_op   := "==" / "!=" / "<>" / "<" / ">" / "<=" / ">=" 
digit    := %x30-39
alpha    := "a" ... "z" # all letters
alnum    :* alpha / digit / "_"
+

if_stmt  := "if" expr "then"  # an aid, not part of expression itself

expr     := e_and *("or" e_and)
e_and    := e_cmp *("and" e_cmp)
e_cmp    := val 0*1(cmp_op val)
val      := ["+" / "-"] term *(("+" / "-") term)
term     := factor *(("*" / "/" / "%") factor)
factor   := ["not"] terminal
terminal := var / constant / function / "(" expr ")"
function := name "(" *("," expr) ")"
var      := "$" varname
varname  := msgvar / sysvar
msgvar   := name
sysvar   := "$" name
name     := alpha *(alnum)
constant := string / number
string   := simpstr / tplstr ; tplstr will be implemented in next phase
simpstr  := "'" *char "'"    ; use your imagination for char ;)
tplstr   := '"' template '"' ; not initially implemented
number   := 1*digit ; 0nn = octal, 0xnn = hex, nn = decimal
cmp_op   := "==" / "!=" / "<>" / "<" / ">" / "<=" / ">=" / "contains" / "startswith"
digit    := %x30-39
alpha    := "a" ... "z" # all letters
alnum    :* alpha / digit / "_"

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