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azproduction/LICENSE.txt

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Created December 19, 2011 16:31
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Simple argv parser in 100 bytes
Raw
README.md

Simple argv parser in 100 bytes

Parses Unix (-pewpew, --pew-pew=value, --pewpew value) and Dos style (/x, /x value) argv strings

Input

"node server.js -h 0.0.0.0 -p 80 -s -a --vvvv --r-x /v 123 /x --debug-enabled=yes"

Output

{
  "h": "0.0.0.0",
  "p": "80",
  "s": true,
  "a": true,
  "vvvv": true,
  "r-x": true,
  "v": 123,
  "x": true,
  "debug-enabled": "yes"
}

Demo: http://jsfiddle.net/p3mc9/3/

Thx @maettig for help

Notice!

This parser can have a strange behavior if you pass full path names e.g. -location /home/user/path/to/file.txt it thinks that /home is dos-style argument name... Fix it if your file accepts paths - \B[\/-] -> \B-

Raw
annotated.js
function (
argv, // {String} argv
item, // argv item
result, // result hash
i // counter
){
result = {}; // reset
for(
argv = argv.split(/\s*\B[\/-]+([\w-]+)[\s=]*/), // use special regexp
// "node pewpew.js --p a -c -d" ~~magic~~>
// ["node pewpew.js", "p", "a", "c", "", "d", ""]
i = 1; // skip 1 item ("node pewpew.js")
item = argv[i++]; // while !eoargv
result[item] = argv[i++] || !0 // set value, default true
);
return result;
}
Raw
index.js
function(a,b,c,d){c={};for(a=a.split(/\s*\B[\/-]+([\w-]+)[\s=]*/),d=1;b=a[d++];c[b]=a[d++]||!0);return c}
Raw
LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 Mikhail Davydov
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
Raw
package.json
{
"name": "argv_parser",
"description": "Simple argv parser: both unix and dos style",
"keywords": [
"argv",
"parser",
"unix",
"dos"
]
}
Raw
test.html
<!DOCTYPE html>
<title>argv_parser</title>
<div>Expected value: <b>{"h":"0.0.0.0","p":"80","s":true,"a":true,"vvvv":true,"r-x":true,"v":"123","x":true,"debug-enabled":"yes"}</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
var argv = 'node server.js -h 0.0.0.0 -p 80 -s -a --vvvv --r-x /v 123 /x --debug-enabled=yes',
argv_parser = function(a,b,c,d){c={};for(a=a.split(/\s*\B[\/-]+([\w-]+)[\s=]*/),d=1;b=a[d++];c[b]=a[d++]||!0);return c};
document.getElementById("ret").innerHTML = JSON.stringify(argv_parser(argv));
</script>
@maettig
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maettig commented Dec 20, 2011

I saw you changed \w to [\w-]. Yes, that's better. If you want, you can also change the last \s* to [\s=]*. This will allow Unix style like --long-name=value (becomes "long-name":"value"). Oh, and of course changing -+ to [\/-]+ will allow both Unix and DOS style.

@azproduction
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Author

Added support for unix with = and dos argvs. Now parser is 100 bytes long - a good number :-)

@subzey
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subzey commented Dec 26, 2011

One byte less:
function(a,b,c,d){d=c={};for(a=a.split(/\s*\B[\/-]+([\w-]+)[\s=]*/);b=a[d|=1];c[b]=a[++d]||!0);return c}

Update:
function(a){for(var b=a.split(/\s*\B[\/-]+([\w-]+)[\s=]*/),c={},d;a=b[d|=1];c[a]=b[++d]||!0);return c}

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