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https://github.com/bleargh45/javascript-minifier-xs
XS based JavaScript minifier
https://github.com/bleargh45/javascript-minifier-xs
javascript-minifier minification minifier minify-javascript perl xs
Last synced: 2 months ago
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XS based JavaScript minifier
- Host: GitHub
- URL: https://github.com/bleargh45/javascript-minifier-xs
- Owner: bleargh45
- Created: 2015-01-27T07:35:01.000Z (almost 10 years ago)
- Default Branch: main
- Last Pushed: 2024-09-03T22:24:27.000Z (4 months ago)
- Last Synced: 2024-09-30T15:13:10.150Z (3 months ago)
- Topics: javascript-minifier, minification, minifier, minify-javascript, perl, xs
- Language: XS
- Homepage: https://metacpan.org/release/JavaScript-Minifier-XS/
- Size: 152 KB
- Stars: 1
- Watchers: 2
- Forks: 1
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- Changelog: Changes
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README
# NAME
JavaScript::Minifier::XS - XS based JavaScript minifier
# SYNOPSIS
```perl
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 ([email protected])
# 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`.