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Allow default function/hook/event parameters. Addresses #972.

Browse source 
And changed the endianness parameter of bytestring_to_count() BIF to
default to false (big endian), mostly just to prove that the BIF parser
doesn't choke on default parameters.
This commit is contained in:
Jon Siwek 2013-05-07 14:32:22 -05:00
parent 69c7363147
commit e2a1d4a233
14 changed files with 239 additions and 28 deletions
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33
doc/scripts/builtins.rst
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@ -459,6 +459,31 @@ The Bro scripting language supports the following built-in types.
print greeting("Dave");
Function parameters may specify default values as long as they appear
last in the parameter list:
.. code:: bro
global foo: function(s: string, t: string &default="abc", u: count &default=0);
If a function was previously declared with default parameters, the
default expressions can be omitted when implementing the function
body and they will still be used for function calls that lack those
arguments.
.. code:: bro
function foo(s: string, t: string, u: count)
{
print s, t, u;
}
And calls to the function may omit the defaults from the argument list:
.. code:: bro
foo("test");
.. bro:type:: event
Event handlers are nearly identical in both syntax and semantics to
@ -597,10 +622,10 @@ scripting language supports the following built-in attributes.
.. bro:attr:: &default
Uses a default value for a record field or container elements. For
example, ``table[int] of string &default="foo" }`` would create a
table that returns the :bro:type:`string` ``"foo"`` for any
non-existing index.
Uses a default value for a record field, a function/hook/event
parameter, or container elements. For example, ``table[int] of
string &default="foo" }`` would create a table that returns the
:bro:type:`string` ``"foo"`` for any non-existing index.
.. bro:attr:: &redef