douglascrockford/jsmin

JavaScript Minification Filter

jsmin's Issues

Preserve important comments e.g. copyright/ license information

JSMin should preserve important comments e.g. copyright or license info.
Otherwise webmasters could unknowingly be infringing on copyright when including 3rd party code.

YUI compressor gets around this by checking for important comments e.g:
/*!
Something very important
*/

See more about this issue:
http://zoompf.com/blog/2009/11/jsmin-important-comments-and-copyright-violations

And a fork of JSmin that has solved this problem:
http://fmarcia.info/jsmin/test.html

Any way to optimize Firefox JS files?

subj

JSMin gives error when parsing a specific string

Hi,

We are currently experiencing problems with using JSMin. The javascript code that causes us problems is this:

var pattern=/^(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])$/;

The usage is this:
$jsmin_php = JSMin::minify(file_get_contents("error.js"));
echo $jsmin_php;

The error thrown is this:
Fatal error: Uncaught exception 'JSMin_UnterminatedStringException' with message 'Unterminated String: ''+/=?^`{|}~-]+)|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\[\x01-\x09\x0b\x0c\x0e-\x7f])")@(?:(?:a-z0-9?.)+a-z0-9?|[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?).){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]_[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\[\x01-\x09\x0b\x0c\x0e-\x7f])+)])$/;'' in /home/kasper/kaspergrubbe.dk/htdocs/JSMin.php:151 Stack trace: #0 /home/kasper/kaspergrubbe.dk/htdocs/JSMin.php(123): JSMin->action(1) #1 /home/kasper/kaspergrubbe.dk/htdocs/JSMin.php(80): JSMin->min() #2 /home/kasper/kaspergrubbe.dk/htdocs/JSMin.php(53): JSMin::minify('var pattern=/^(...') #3 {main} thrown in /home/kasper/kaspergrubbe.dk/htdocs/JSMin.php on line 151

use_2to3 is invalid

We're experiencing a new issue installing jsmin as a dependency for azure-cli:

#11 130.2 Collecting jsmin==2.2.2
#11 130.2   Downloading jsmin-2.2.2.tar.gz (12 kB)
#11 130.4     ERROR: Command errored out with exit status 1:
#11 130.4      command: /usr/local/bin/python -c 'import io, os, sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-poyif1fk/jsmin_cbd1c10d3c314dd28f81bc98eb1cc7c2/setup.py'"'"'; __file__='"'"'/tmp/pip-install-poyif1fk/jsmin_cbd1c10d3c314dd28f81bc98eb1cc7c2/setup.py'"'"';f = getattr(tokenize, '"'"'open'"'"', open)(__file__) if os.path.exists(__file__) else io.StringIO('"'"'from setuptools import setup; setup()'"'"');code = f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' egg_info --egg-base /tmp/pip-pip-egg-info-i4jrcuyg
#11 130.4          cwd: /tmp/pip-install-poyif1fk/jsmin_cbd1c10d3c314dd28f81bc98eb1cc7c2/
#11 130.4     Complete output (1 lines):
#11 130.4     error in jsmin setup command: use_2to3 is invalid.
#11 130.4     ----------------------------------------

I've tried explicitly installing 2to3 and explicitly invoking pip and python with 3, but no dice. Any help would be appreciated!

Unterminated Regular Expression Error except when comment on next line

With the latest update to JSMin I was able to get it to minify the d3.js library correctly, thanks again for that. So I decided to do a little work on the PHP port of JSMin to get it up to date with the latest release, however I ran into an inconsistency that I thought I would point out.

Once again, the d3 author(s) are doing something that JSLint doesn't recommend:

// Compute the angular scale factor: from value to radians.
var k = ((typeof endAngle === "function"
    ? endAngle.apply(this, arguments)
    : endAngle) - startAngle)
    / d3.sum(values);

Running JSMin on just this snippet will cause it to spit up the "Unterminated Regular Expression literal." due to the division operator being on its own line. Which made me question why/how it's getting through the whole d3.js file without encountering the same error. It appears to be because the next line in the file is a comment:

// Compute the angular scale factor: from value to radians.
var k = ((typeof endAngle === "function"
    ? endAngle.apply(this, arguments)
    : endAngle) - startAngle)
    / d3.sum(values);

// Optionally sort the data.

I believe that JSMin sees that first character of the comment line as the ending regex token, so doesn't complain in this situation.

c++ streambuf implementation

I needed a quick and dirty implementation to clean .json files from comments and created a streambuf based version of jsmin. The code is not nice nor clean and it is not very well tested as we are not using it in production but maybe someone will find the implementation useful as a starting point.

Regular expression literal can have its whitespace removed

Consider this legal JS (found in highcharts 4.1.4, already apparently minified by Closure Compiler):

{dSetter:function(a,b,c){a&&a.join&&(a=a.join(" "));/(NaN| {2}|^$)/.test(a)&&(a="M 0 0");c.setAttribute(b,a);this[b]=a}}

JSMin outputs:

{dSetter:function(a,b,c){a&&a.join&&(a=a.join(" "));/(NaN|{2}|^$)/.test(a)&&(a="M 0 0");c.setAttribute(b,a);this[b]=a}}

The RegExp literal has been modified (| { --> |{, which also happens to be invalid syntax).

Seems to be distinct from #11 because testing across history indicates the problem was only introduced by cec896f (which is newer than #11).

Over eager removal of whitespace

In the majority of cases any whitespace following the closing curly brace can be removed but since the introduction of template literals this is no longer a safe assumption. Spaces following interpolated values in a template literal need to be preserved. For example,
Unexpected ${token} encountered gets incorrectly minified to Unexpected ${token}encountered so when the token is 'comma' the minified version outputs 'Unexpected commaencountered'.

Linefeeds in Javascript Strings

Hey there,

I'm using JSMin for a few minutes and have a problem:
If my Javascript Code contains a string like
"I am a string\n"

JSMin places a Linefeed in the output instead of just leaving the \n in the String. So it is not replacing it, it outputs it which causes the line feed, which itself causes a Javascript-Error in the Browser "not terminating string literal"

Feedback on License comments

For some of the files I merge, and then minify as well as pack/compress, I had a friend note that (as an example) JQuery requires there license header be left in for commercial uses of it.
/*! jQuery v1.7 jquery.com | jquery.org/license */

I don't know if its widely supported to ignore this type of comment or not, or subsequently put it back in. Just thought I'd toss it out there since currently this script removes all comments.

JSmin removed spaces after literals in strings.

Currently when using a litteral in a string, for example in a query selector, the spaces are removed after the }.

document.querySelector(`${id} .read-more-elip`).classList.toggle('d-none');
complies to
document.querySelector(`${id}.read-more-elip`).classList.toggle('d-none'); which breaks the querySelector.

Unary Plus operator (+) to convert boolean to number, preceded by addition operator causes JS syntax error

Found this today when trying to minify the d3.js library (http://d3js.org/). Here's one of the two lines in question where the author is using the unary operator to convert a boolean value into a one or zero to be added to another value:

function arc(r, p, a) {
    return "A" + r + "," + r + " 0 " + +(a > Math.PI) + ",1 " + p;
}

JSMin converts this code to:

function arc(r,p,a){return"A"+r+","+r+" 0 "++(a>Math.PI)+",1 "+p;}

Which causes the Javascript syntax error: "SyntaxError: invalid increment operand"

Perhaps not recommended (I see that JSLint complains about the confusing plusses), but possible to make JSMin handle these better? (leave the space?)

Thanks

Can we tag a release?

👋 It looks like right now, there is no release tagged on specific commit for the project. Thanks!

• relates to Homebrew/homebrew-core#93468

cc @douglascrockford

Broken link on documentation site

The link to "jsmin.exe: JSMin prebuilt for MS-DOS" ( http://www.https//www.crockford.com/javascript/jsmin.zip ) on https://www.crockford.com/jsmin.html is broken

Licensing issues

Hi,
We are using the PHP version of your script (https://github.com/rgrove/jsmin-php/) on our open-source project, the problem is Debian team doesn't accept our project because the licence of JSMin is void because of the sentence "The Software shall be used for Good, not Evil."

This is a modification of the license text which is not allowed, thus JSMin is actually not OpenSource.

Is it possible you correct that ?
http://www.opensource.org/licenses/mit-license.php

Unrecognized Regex Literals

Given this if statement, the following snippets aren't seen as regex literals by JSMin:

if (theB == '/' && (theA == '(' || theA == ',' || theA == '=' ||
                            theA == ':' || theA == '[' || theA == '!' ||
                            theA == '&' || theA == '|' || theA == '?' ||
                            theA == '{' || theA == '}' || theA == ';' ||
                            theA == '\n')) {

Snippet #1:

var ex = +/w$/.test(resizing),
    ey = +/^n/.test(resizing);

In this case, when "theB" == "/", "theA" == "+" which isn't one of the conditions defined.

Snippet #2:

return /[",\n]/.test(text)
      ? "\"" + text.replace(/\"/g, "\"\"") + "\""
      : text;

In this case, "theA" == " " because of the return.

Jsmin doesn't treat backtick strings as strings

A string such as this:

var subUrl = prompt("hi"),
  myVar = `https://example.com/${subUrl}/moreurlstuff`
console.log(myVar)

Is turned into something like this:

var subUrl=prompt("hi"),myVar=`https:console.log(myVar)

In other words it causes a syntax error (unterminated backtick string starting at char 31. The double forward slash in the original string is treated as a single-line comment). For other people having this exact issue, a temporary workaround was to change the code to this untill jsMin can handle backtick strings, but I can't say for sure if this would cause other problems as I have yet to try it in prod with more compicated strings.

var subUrl = prompt("hi"),
  myVar = `https:/${"/"}example.com/${subUrl}/moreurlstuff`
console.log(myVar)

Regex: / /g seems to be replaced by //g

I'm using django-pipeline with the JS Compressor set to JSMinCompressor.

This is wrong and leads to an error..

The code which it minifies wrongly is here:
https://github.com/metajack/strophejs/blob/master/src/core.js#L732