NAME

       JavaScript::Minifier::XS - XS based JavaScript minifier

SYNOPSIS

         use JavaScript::Minifier::XS qw(minify);
         my $js       = '...';
         my $minified = minify($js);

DESCRIPTION

       "JavaScript::Minifier::XS" is a JavaScript "minifier"; its designed to remove unnecessary
       whitespace and comments from JavaScript files, which also not breaking the JavaScript.

       "JavaScript::Minifier::XS" is similar in function to "JavaScript::Minifier", but is
       substantially faster as its written in XS and not just pure Perl.

METHODS

       minify($js)
           Minifies the given $js, returning the minified JavaScript back to the caller.

HOW IT WORKS

       "JavaScript::Minifier::XS" minifies the JavaScript by removing unnecessary whitespace from
       JavaScript documents.  Comments (both block and line) are also removed, except when (a)
       they contain the word "copyright" in them, or (b) they're needed to implement "IE
       Conditional Compilation".

       Internally, the minification process is done by taking multiple passes through the
       JavaScript document:

   Pass 1: Tokenize
       First, we go through and parse the JavaScript document into a series of tokens internally.
       The tokenizing process does not check to make sure you've got syntactically valid
       JavaScript, it just breaks up the text into a stream of tokens suitable for processing by
       the subsequent stages.

   Pass 2: Collapse
       We then march through the token list and collapse certain tokens down to their smallest
       possible representation.  If they're still included in the final results we only want to
       include them at their shortest.

       Whitespace
           Runs of multiple whitespace characters are reduced down to a single whitespace
           character.  If the whitespace contains any "end of line" (EOL) characters, then the
           end result is the first EOL character encountered.  Otherwise, the result is the first
           whitespace character in the run.

   Pass 3: Pruning
       We then go back through the token list and prune and remove unnecessary tokens.

       Whitespace
           Wherever possible, whitespace is removed; before+after comment blocks, and
           before+after various symbols/sigils.

       Comments
           Comments that are either (a) IE conditional compilation comments, or that (b) contain
           the word "copyright" in them are preserved.  All other comments (line and block) are
           removed.

       Everything else
           We keep everything else; identifiers, quoted literal strings, symbols/sigils, etc.

   Pass 4: Re-assembly
       Lastly, we go back through the token list and re-assemble it all back into a single
       JavaScript string, which is then returned back to the caller.

AUTHOR

       Graham TerMarsch (cpan@howlingfrog.com)

COPYRIGHT

       Copyright (C) 2007-, Graham TerMarsch.  All Rights Reserved.

       This is free software; you can redistribute it and/or modify it under the same license as
       Perl itself.

SEE ALSO

       "JavaScript::Minifier".