use Parse::RecDescent;

$grammar = q {
        list:       <leftop: <matchrule:$arg{rule}> /$arg{sep}/ <matchrule:$arg{rule}> >

        function: 'func' ident '(' list[rule=>'param',sep=>';'] ')'
                {{ name=>$item{ident}, param=>$item{list} }}

        param:      list[rule=>'ident',sep=>','] ':' typename
                {{ vars=>$item{list}, type=>$item{typename} }}

        ident:      /\w+/

        typename: /\w+/
         };

unless( $parser = new Parse::RecDescent( $grammar ))
{
    die "bad grammar; bailing\n";
}

while (defined($input = <DATA>))
{
    use Data::Dumper;
    print Data::Dumper->Dump([$parser->function( $input )]);
}

__DATA__
func f (a,b,c:int; d:float; e,f:string)
func g (x:int)
func h (y;x)