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LEARN ABOUT DEBIAN
javascript::minifier::xs
JavaScript::Minifier::XS(3pm) User Contributed Perl Documentation JavaScript::Minifier::XS(3pm)
NAME
JavaScript::Minifier::XS - XS based JavaScript minifier
SYNOPSIS
use JavaScript::Minifier::XS qw(minify);
$minified = minify($js);
DESCRIPTION
"JavaScript::Minifier::XS" is a JavaScript "minifier"; its designed to remove un-necessary 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 un-necessary 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 un-necessary 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)
REPORTING BUGS
Please report bugs via RT (<http://rt.cpan.org/Dist/Display.html?Queue=JavaScript::Minifier::XS>), and be sure to include the JavaScript
that you're having troubles minifying.
COPYRIGHT
Copyright (C) 2007-2008, 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".
perl v5.14.2 2011-11-15 JavaScript::Minifier::XS(3pm)