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Doc: Improve readability of the operator documentation

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Johannes Erwerle 2024-10-15 16:56:48 +02:00 committed by Ondrej Zajicek
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@ -1897,21 +1897,31 @@ in the foot).
<label id="operators">
<p>The filter language supports common integer operators <cf>(+,-,*,/)</cf>,
parentheses <cf/(a*(b+c))/, comparison <cf/(a=b, a!=b, a&lt;b, a&gt;=b)/.
Logical operations include unary not (<cf/!/), and (<cf/&amp;&amp;/), and or
(<cf/&verbar;&verbar;/). Special operators include (<cf/&tilde;/,
<cf/!&tilde;/) for "is (not) element of a set" operation - it can be used on
element and set of elements of the same type (returning true if element is
contained in the given set), or on two strings (returning true if first string
matches a shell-like pattern stored in second string) or on IP and prefix
(returning true if IP is within the range defined by that prefix), or on prefix
and prefix (returning true if first prefix is more specific than second one) or
on bgppath and bgpmask (returning true if the path matches the mask) or on
number and bgppath (returning true if the number is in the path) or on bgppath
and int (number) set (returning true if any ASN from the path is in the set) or
on pair/quad and clist (returning true if the pair/quad is element of the
clist) or on clist and pair/quad set (returning true if there is an element of
the clist that is also a member of the pair/quad set).
parentheses <cf/(a*(b+c))/, comparison <cf/(a=b, a!=b, a&lt;b, a&gt;=b)/.</p>
<p>Logical operations include unary not (<cf/!/), and (<cf/&amp;&amp;/), and or
(<cf/&verbar;&verbar;/).</p>
<p>Special operators include (<cf/&tilde;/, <cf/!&tilde;/) for "is (not) element
of a set" operation - it can be used on:
<itemize>
<item>element and set of elements of the same type (returning true if
element is contained in the given set)
<item>two strings (returning true if the first string matches a shell-like
pattern stored in the second string)
<item>IP and prefix (returning true if IP is within the range defined by
that prefix)
<item>prefix and prefix (returning true if the first prefix is more specific
than the second one)
<item>bgppath and bgpmask (returning true if the path matches the mask)
<item>number and bgppath (returning true if the number is in the path)
<item>bgppath and int (number) set (returning true if any ASN from the
path is in the set)
<item>pair/quad and clist (returning true if the pair/quad is element of
the clist)
<item>clist and pair/quad set (returning true if there is an element of the
clist that is also a member of the pair/quad set).
</itemize>
<p>There is one operator related to ROA infrastructure - <cf/roa_check()/. It
examines a ROA table and does <rfc id="6483"> route origin validation for a