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";
}
Topic revision: r1 - 2008-01-22 - TWikiContributor
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright &© 1999-2024 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback
Note: Please contribute updates to this topic on TWiki.org at TWiki:TWiki.TWikiLineIteratorDotPm.