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Text-Tokenize-Indented-0.01
River stage zero No dependents
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/ Text::Tokenize::Indented

NAME

Text::Tokenize::Indented - tokenize indented lines in text

VERSION

Version 0.01

SYNOPSIS

As part of the Decl language project (the windmill I've been tilting at since 2010), I end up working with text a lot that is structured by indentation. Finally, I think, this module provides a solid underpinning to working with that kind of text, in that it provides as convenient a tokenizer as possible.

It's based on Iterator::Simple::Lookahead, meaning that it (1) does a lazy tokenization of a list passed into it, and (2) provides a peek and unget so that you can easily chain tokenizers; if a given piece that has already been identified turns out to break into multiple tokens, you simply tokenize it and push the subpieces back into the stream for later retrieval as individual tokens.

This allows very nice compartmentalization of the details of parsing, leaving you a lot less to debug when parsing more difficult items.

You use it like this:

   use Text::Tokenize::Indented;
   
   my $tok = Text::Tokenize::Indented ({tab => 4}, <<EOF, {tab => 8}, $trailing_iterator)
   text
   text
      text
      text
   
   text
   EOF

(For instance.) This then returns the following token stream:

   [0, 'text']
   [0, 'text']
   [3, 'text']
   [3, 'text']
   [-1]
   [0, 'text']
   (whatever the trailing iterator returns)

We might then chain another tokenizer onto this one which would tokenize the individual lines into more meaningful things. Note that blank lines officially have an indentation of -1.

METHODS

new

Creates a new tokenizer, with or without input. Any parameters are passed to input. The defaults for parameters are as follows: tabs=4 (tabs are 4 spaces), blank, newline. Any parameter can be changed mid-stream by sending a hashref into the input.

Returns an Iterator::Simple::Lookahead iterator that returns items from the input queue.

tokenize (@input)

Creates a tokenizer with input, but instead of returning the object, returns only the iterator. No new input can be added to this tokenizer, but normally you don't care.

input

Input is where text is loaded up into the tokenizer. It takes a list of items, each of which can be either a hashref, which will be used to set values in the tokenizer that apply to coming data, a string, which will be split into lines, or an iterable object, which will be passed through to the tokenizer output.

Returns the iterator for the object.

AUTHOR

Michael Roberts, <michael at vivtek.com>

BUGS

Please report any bugs or feature requests to bug-text-tokenize-indented at rt.cpan.org, or through the web interface at http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Text-Tokenize-Indented. I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.

SUPPORT

You can find documentation for this module with the perldoc command.

    perldoc Text::Tokenize::Indented

You can also look for information at:

ACKNOWLEDGEMENTS

LICENSE AND COPYRIGHT

Copyright 2014 Michael Roberts.

This program is free software; you can redistribute it and/or modify it under the terms of the the Artistic License (2.0). You may obtain a copy of the full license at:

http://www.perlfoundation.org/artistic_license_2_0

Any use, modification, and distribution of the Standard or Modified Versions is governed by this Artistic License. By using, modifying or distributing the Package, you accept this license. Do not use, modify, or distribute the Package, if you do not accept this license.

If your Modified Version has been derived from a Modified Version made by someone other than you, you are nevertheless required to ensure that your Modified Version complies with the requirements of this license.

This license does not grant you the right to use any trademark, service mark, tradename, or logo of the Copyright Holder.

This license includes the non-exclusive, worldwide, free-of-charge patent license to make, have made, use, offer to sell, sell, import and otherwise transfer the Package with respect to any patent claims licensable by the Copyright Holder that are necessarily infringed by the Package. If you institute patent litigation (including a cross-claim or counterclaim) against any party alleging that the Package constitutes direct or contributory patent infringement, then this Artistic License to you shall terminate on the date that such litigation is filed.

Disclaimer of Warranty: THE PACKAGE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS "AS IS' AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES. THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT ARE DISCLAIMED TO THE EXTENT PERMITTED BY YOUR LOCAL LAW. UNLESS REQUIRED BY LAW, NO COPYRIGHT HOLDER OR CONTRIBUTOR WILL BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING IN ANY WAY OUT OF THE USE OF THE PACKAGE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.