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Package =TWiki::LineIterator
Iterator over the lines in a file
new( $file )
Create a new iterator over the given file. if the file cannot be opened, then
there will be no elements in the iterator.
hasNext() -> $boolean
Returns false when the iterator is exhausted.
my $it = new TWiki::ListIterator(\@list);
while ($it->hasNext()) {
...
next() -> $data
Return the next line in the file.
The iterator object can be customised to pre- and post-process entries from
the list before returning them. This is done by setting two fields in the
iterator object:
-
{filter} can be defined to be a sub that filters each entry. The entry will be ignored (next() will not return it) if the filter returns false.
-
{process} can be defined to be a sub to process each entry before it is returned by next. The value returned from next is the value returned by the process function.
For example,
my $it = new TWiki::LineIterator("/etc/passwd");
$it->{filter} = sub { $_[0] =~ /^.*?:/; return $1; };
$it->{process} = sub { return "User $_[0]"; };
while ($it->hasNext()) {
my $x = $it->next();
print "$x\n";
}
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