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internal package Foswiki::LineIterator

See PublishedAPI for packages intended to be used by Plugin and Contrib authors, or browse all packages.
See also Developing plugins, Developer's Bible, Technical Overview

internal package Foswiki::LineIterator is a Foswiki::Iterator

implements Foswiki::Iterator

Iterator over the lines read from a file handle.

new( $fh )

Create a new iterator over the given file handle.

hasNext() -> $boolean

Returns false when the iterator is exhausted.

my $it = new Foswiki::ListIterator(\@list);
while ($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 Foswiki::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";
}

r1 - 19 Apr 2011 - 03:38:03 - ProjectContributor
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