我正在使用Perl中的Parse::RecDescent解析器,而且我似乎从中获取信息的时间最为可怕。网上很容易获得的信息似乎没有不平凡的例子。Parse :: RecDescent - 从中获取信息
下面是代码:
event_function: object_list ':' event_list ';'
<defer:
{ #item is a special character with Parse::Recdescent.
print Dumper($item{object_list});
$return = $item[1];
}
>
| object_list ':' ';'
<defer:
{
print Dumper($item{object_list});
$return = $item[1];
}
>
下面是输入文件解析正确的输出
PS W:\developers\paulnathan\rd_dir> perl parser.pl testfile
$VAR1 = 4;
$VAR1 = 8;
PS W:\developers\paulnathan\rd_dir>
。
stuff, stuff2: pre-operation event = {foo1, foo2};
它应该来输出由 “东西”, “stuff2” 键哈希值。
想法?
编辑:
object_list :
object ',' object_list
<defer:
{
my $retval =();
$retval = ::merge_hash_refs($item[1], $item[3]);
$return = $retval;
}
>
| object
<defer:
{
#print Dumper($item{object});
$return = $item{object};
}
>
object :
'/' /[a-z0-9_][a-z0-9_]*/ '/' '...'
<defer:
{
$::objects->{$item[2]} = "stuff";
$return = $::objects;
}
>
| /[a-z0-9_][a-z0-9_]*/
<defer:
{
$::objects->{$item[1]} = "stuff";
$return = $::objects;
}
>
EDIT2: Merge_hash_refs,以防万一。 :-)
#takes two hash references.
sub merge_hash_refs {
my($ref1, $ref2) = @_;
my $retref =();
while(my ($k, $v) = each %$ref1) {
$retref->{$k} = $v;
}
while(my ($k, $v) = each %$ref2) {
$retref->{$k} = $v;
}
return $retref;
}
你能显示object_list和event_list规则的内容吗? – 2009-06-04 16:38:28
Event_list不返回任何内容;添加了object_list。 – 2009-06-04 16:40:03