NAME

    Text::Util::Chinese - A collection of subroutines for processing
    Chinese Text

Exportable Subroutines

    extract_words( $input_iter ) #=> ArrayRef[Str]

      This extracts words from Chinese text. A word in Chinese text is a
      token with N charaters. These N characters is often used together in
      the input and therefore should be a meaningful unit.

      The input parameter is a iterator -- a subroutine that must return a
      string of Chinese text each time it is invoked. Or, when the input is
      exhausted, it must return undef. For example:

          open my $fh, '<', 'book.txt';
          my $words = extract_words(
              sub {
                  my $x = <$fh>;
                  return decode_utf8 $x;
              });

      The type of return value is ArrayRef[Str].

      It is likely that this subroutine returns an empty ArrayRef with no
      contents. It is only useful when the volume of input is a leats a few
      thousands of characters. The more, the better.

    extract_presuf( $input_iter, $output_cb, $opts ) #=> HashRef

      This subroutine extract meaningful tokens that are prefix or suffix
      of input. Comparing to extract_word, it yields extracted tokens
      frequently by calling $output_cb.

      It is used like this:

          my $extracted = extract_presuf(
              \&next_input,
              sub {
                  my ($token, $extracted) = @_;
      
                  ...
              },
              { threshold => 9 }
          );

      The $output_cb callback is passed two arguments. The first one is the
      new $token that appears more then $threshold times as a prefix and as
      a suffix. The second arguments is a HashRef with keys being the set
      of all extracted tokens. The very same HashRef is also going to be
      the return value of this subroutine.

      The 3rd argument is a HashRef with parameters to the internal
      algorithm. So far threshold is the only one with default value being
      9.

AUTHORS

    Kang-min Liu <gugod@gugod.org>

LICENCE

    Unlicense https://unlicense.org/