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StyleStats

StyleStats is Node.js library to collect CSS statistics.

Build Status Coverage Status Code Climate NPM version Dependency Status devDependency Status

Installation

StyleStats works on Node.js 0.10.x

$ npm install -g stylestats

Usage

$ stylestats path/to/stylesheet.css
StyleStats!
┌─────────────────────────────────┬────────────────┐
│ Stylesheets                     │ 1              │
├─────────────────────────────────┼────────────────┤
│ Size                            │ 753B           │
├─────────────────────────────────┼────────────────┤
│ Data Uri Size                   │ 82B            │
├─────────────────────────────────┼────────────────┤
│ Raito Of Data Uri Size          │ 10.89%         │
├─────────────────────────────────┼────────────────┤
│ Rules                           │ 7              │
├─────────────────────────────────┼────────────────┤
│ Selectors                       │ 12             │
├─────────────────────────────────┼────────────────┤
│ Simplicity                      │ 58.33%         │
├─────────────────────────────────┼────────────────┤
│ Most Identifers                 │ 3              │
├─────────────────────────────────┼────────────────┤
│ Most Identifers Selector        │ .foo .bar .baz │
├─────────────────────────────────┼────────────────┤
│ Lowest Cohesion                 │ 2              │
├─────────────────────────────────┼────────────────┤
│ Lowest Cohesion Selector        │ .foo           │
├─────────────────────────────────┼────────────────┤
│ Total Unique Font Sizes         │ 2              │
├─────────────────────────────────┼────────────────┤
│ Unique Font Size                │ 12px           │
│                                 │ 16px           │
├─────────────────────────────────┼────────────────┤
│ Total Unique Colors             │ 3              │
├─────────────────────────────────┼────────────────┤
│ Unique Color                    │ #333           │
│                                 │ #CCC           │
│                                 │ RED            │
├─────────────────────────────────┼────────────────┤
│ Id Selectors                    │ 1              │
├─────────────────────────────────┼────────────────┤
│ Universal Selectors             │ 1              │
├─────────────────────────────────┼────────────────┤
│ Unqualified Attribute Selectors │ 1              │
├─────────────────────────────────┼────────────────┤
│ Javascript Specific Selectors   │ 0              │
├─────────────────────────────────┼────────────────┤
│ Important Keywords              │ 1              │
├─────────────────────────────────┼────────────────┤
│ Float Properties                │ 1              │
├─────────────────────────────────┼────────────────┤
│ Media Queries                   │ 0              │
├─────────────────────────────────┼────────────────┤
│ Properties Count                │ color: 4       │
│                                 │ font-size: 3   │
│                                 │ margin: 2      │
│                                 │ float: 1       │
└─────────────────────────────────┴────────────────┘

StyleStats supports remote file analysis!!!

$ stylestats http://t32k.me/static/blog/skelton.css

StyleStats supports multiple input.

$ stylestats foo.css bar.css baz.css

supports directory input.

$ stylestats path/to/dir

supports glob(required quotations) input.

$ stylestats 'path/**/*.css'

-e option output JSON or CSV or HTML.

$ stylestats foo.css -e [json|csv|html]

If you installed gist tool, you can upload StyleStats data to GitHub Gist with one-liner command.

$ stylestats http://t32k.me/static/blog/skelton.css -e html > stats.md && gist stats.md
https://gist.github.com/9725673

Grunt & Gulp modules

Metrics

Simplicity

The Simplicity is measured as Rules divided by Selectors.

Lowest Cohesion

The Lowest Cohesion metrics is the number of selector declaration.

Unqualified Attribute Selectors

The Unqualified Attribute Selectors metrics is the number of unqualified attribute selectors.

The following patterns will be counted:

[type=text] {
    color: red;
}

.selected [type=text] {
    color: red;
}

The following patterns are considered as okay and will not be counted:

/* unqualified attribute selector is not key */
.selected [type=text] a {
    color: red;
}

See also:

JavaScript Specific Selectors

The JavaScript Specific Selectors metrics is the number of JavaScript-specific selectors, such as js-*. the selectors only for JavaScript hooks, you should not to hang any presentation off them.

See also:

Properties Count

The Properties Count is the number of property declaration. Default option is set to display the top 10 properties.

Configuration

You can configure StyleStats.

CLI:

$ stylestats -c path/to/.stylestatsrc

API:

var StyleStats = require('stylestats');
var stats = new StyleStats('path/to/stylesheet.css', 'path/to/.stylestatsrc');

Default configuration is here.

Here is an example of enabling display gzipped size:

{
  "gzippedSize": true
}

gzippedSize attribute is false by default. Because it is pretty slow.

CLI Reference

$ stylestats -h

  Usage: stylestats [options] <file ...>

  Options:

    -h, --help                output usage information
    -V, --version             output the version number
    -c, --config [path]       Path and name of the incoming JSON file.
    -e, --extension [format]  Specify the format to convert. <json|csv>
    -s, --simple              Show compact style's log.
$ stylestats path/to/stylesheet.css -s -c path/to/.stylestatsrc
StyleStats!
┌───────────────────────────┬───────────────┐
│ Rules                     │ 7             │
│ Selectors                 │ 11            │
│ Lowest Cohesion           │ 6             │
│ Total Unique Font Sizes   │ 5             │
│ Total Unique Colors       │ 2             │
│ Id Selectors              │ 1             │
│ Important Keywords        │ 1             │
│ Media Queries             │ 1             │
└───────────────────────────┴───────────────┘

API Reference

new StyleStats(stylesheet, config)

  1. stylesheet Required String|Array Stylesheet file path or its array.
  2. config Optional String|Object Configuration JSON file path or object.

StyleStats.parse(fn)

var StyleStats = require('stylestats');
var stats = new StyleStats('path/to/stylesheet.css');

stats.parse(function (result) {
  console.log(JSON.stringify(result, null, 2));
});

Example

CSS example:

* { float: left; }
body { color: #333; }
h1, h2, h3, h4, h5, h6 { margin: 0; }
a[src] { color: red !important; }
.foo { color: #ccc; font-size: 12px; }
.foo .bar .baz { color: #ccc; font-size: 12px; }
#bar { margin: 10px; font-size: 16px; }

Statistics tree of above css:

{
  "published": "2014-03-23T15:54:39.825Z",
  "paths": [ "test/fixture/example.css" ],
  "stylesheets": 1,
  "size": 240,
  "dataUriSize": 0,
  "rules": 7,
  "selectors": 12,
  "simplicity": 0.5833333333333334,
  "mostIdentifers": 3,
  "mostIdentifersSelector": ".foo .bar .baz",
  "lowestCohesion": 2,
  "lowestCohesionSelector": [ ".foo" ],
  "totalUniqueFontSizes": 2,
  "uniqueFontSize": [ "12px", "16px" ],
  "totalUniqueColors": 3,
  "uniqueColor": [ "#333", "#CCC", "RED" ],
  "idSelectors": 1,
  "universalSelectors": 1,
  "unqualifiedAttributeSelectors": 1,
  "javascriptSpecificSelectors": 0,
  "importantKeywords": 1,
  "floatProperties": 1,
  "mediaQueries": 0,
  "propertiesCount": [
    { "property": "color", "count": 4 },
    { "property": "font-size", "count": 3 },
    { "property": "margin", "count": 2 },
    { "property": "float", "count": 1 }
  ]
}

Online Tool

(Coming soon)

Release History

  • v2.3.0: Support HTML output CLI option.
  • v2.2.0: Add dataUriSize, raitoOfDataUriSize metics.
  • v2.1.0: Add javascriptSpecificSelectors metics, and fix counting properties in mediaQueries.
  • v2.0.0: API is changed: StyleStats.parse(). Add metrics.
  • v1.2.0: Support multiple input files.
  • v1.1.0: Add universalSelectors metrics.
  • v1.0.0: Major release.

License

Code is released under the MIT license.