Text-Darts - README

NAME

Text::Darts - Perl interface to DARTS by Taku Kudoh

SYNOPSIS

      use Text::Darts;
      my @words = qw/ALGOL ANSI ARCO ARPA ARPANET ASCII/;
      my %word   = map { $_ => lc $_ } @words;
      my $td     = Text::Darts->new(@words);
      my $newstr = $td->gsub("ARPANET is a net by ARPA", sub{ "<<$_[0]>>" });
      # $newstr is now "<<ARPANET>> is a net by <<ARPA>>".
      my $lstr   = $td->gsub("ARPANET is a net by ARPA", \%words);
      # $Lstr is now "arpanet is a net by arpa".

      # or
      my $td     = Text::Darts->open("words.darts"); # make one with mkdarts
      my $newstr = $td->gsub($str, sub{ 
         qq(<a href="http://dictionary.com/browse/$_[0]">$_[0]</a>)
      }); # link'em all!

DESCRIPTION

Darts, or Double-ARray Trie System is a C++ Template Library by Taku Kudoh. This module makes use of Darts to implement global replace like below;

$str = s{ (foo|bar|baz) }{ "<<$1>>" }msgex;

The problem with regexp is that it is slow with alterations. Suppose you want to anchor all words that appear in /usr/share/dict/words with regexp. It would be impractical with regexp. This module makes it practical.

Even if you are using perl 5.10 or better which does TRIE optimization internally, you still have to compile the regexp everytime you run the script. So it is still more practical to use this module if your match is exact -- containing no quantifier.

Since Version 0.05, Text::Darts also accepts a hash reference instead of a code reference. In such cases gsub behaves as follows.

$str = s{ (foo|bar|baz) }{$replacement{$1}}msgx;

like "s///ge" vs "s///g", this is less flexible but faster.

REQUIREMENT

Since Version 0.07, you no longer need to have Darts installed. This module now bundles darts.h which is needed to build this module. To get the most out of Darts, you still need to install Darts 0.32 or above.

<http://chasen.org/~taku/software/darts/index.html> (Japanese)

      fetch http://chasen.org/~taku/software/darts/src/darts-0.32.tar.gz
      tar zxvf darts-0.32.tar.gz
      cd darts-0.32
      configure
      make
      make check
      sudo make install

EXPORT
None.

Functions
Text::Darts::DARTS_VERSION
returns DARTS version. Currently 0.32

Regexp::Assemble

AUTHOR

Dan Kogai, <dankogai@dan.co.jp>

COPYRIGHT AND LICENSE

      Redistribution and use in source and binary forms, with or without
      modification, are permitted provided that the following conditions are
      met:

       * Redistributions of source code must retain the above
         copyright notice, this list of conditions and the
         following disclaimer.

       * Redistributions in binary form must reproduce the above
         copyright notice, this list of conditions and the
         following disclaimer in the documentation and/or other
         materials provided with the distribution.

       * Neither the name of the Nippon Telegraph and Telegraph Corporation
         nor the names of its contributors may be used to endorse or
         promote products derived from this software without specific
         prior written permission.

      THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
      "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
      LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABI LITY AND FITNESS FOR
      A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
      OWNER OR CONT RIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
      SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT
      LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      DATA, OR P ROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      THEORY OF LIABILITY, WHETHER IN CONTRACT , STRICT LIABILITY, OR TORT
      (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
      OF TH IS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

      This library is free software; you can redistribute it and/or modify
      it under the same terms as Perl itself, either Perl version 5.10.0 or,
      at your option, any later version of Perl 5 you may have available.