PostCSS Separator

Split up your Data-URI (or anything else) into a separate CSS file.

Written with PostCSS.

Installation

$ npm install postcss-separator

Usage

Read source.css, process its content, and output processed CSS to styles.css and data.css.

var fs = require('fs');
var separator = require('../index');
 
var original = fs.readFileSync('./fixtures/source.css', 'utf8');
 
var icons = separator.separate(original, {
    dataFile: true
});
var cleanUp = separator.separate(original, {
    dataFile: false
});
 
fs.writeFileSync('./expected/data.css', icons.css);
fs.writeFileSync('./expected/styles.css', cleanUp.css);

If source.css has:

a.top:hover, a.top:focus {
    background-image: url("data:image");
}
 
a.top {
    background-image: url("data:image");
}
 
caption, th, td {
    text-align: left;
    font-weight: normal;
    vertical-align: middle;
}
 
q, blockquote {
    quotes: none;
}
 
q:before, q:after, blockquote:before, blockquote:after {
    content: "";
}
 
a img {
    border: none;
}

You will get the following output in data.css:

a.top:hover, a.top:focus {
    background-image: url("data:image");
}
a.top {
    background-image: url("data:image");
}

Options

keepOrigin (only available in Grunt)

Type: boolean

Default value: false

true: keep the origin file untouched.

false: the origin CSS file will be cleaned up.

dataFile

Type: boolean

Default value: true

true: the generated CSS content of your file matches your pattern.

false: the matching pattern will be removed from your CSS file.

pattern.matchValue

Type: RegExp

Default value: /data:/

A string value that is used to set the value like your are searching for in your CSS.

Example: linear-gradient

pattern.matchProp

Type: RegExp

Default value: false

A string value that is used to set the property your are searching for in your CSS.

Example: background-image

pattern.matchRule

Type: RegExp

Default value: false

A string value that is used to set the rule your are searching for in your CSS.

Example: /lt-ie9/

pattern.matchMedia

Type: RegExp

Default value: false

A value that is used to set the media query your are searching for in your CSS.

Example: resolution: 2dppx

pattern.matchParent

Type: Boolean

Default value: true

A boolean value that is used to include/exclude the rules parent node (eg. in @media blocks).

pattern.matchAtRuleType

Type: RegExp

Default value: false

A value which is used for searching @-types in your CSS.

Examples:

• /print/
• /font-face/

Api

separate(css, [options])

Remove or separate into another file any data in your css.

options (optional) same as the second argument of PostCSS' process() method.

postcss()

Returns PostCSS processor.

You can use this property for combining with other PostCSS processors.

var autoprefixer = require('autoprefixer');
var separator = require('postcss-separator');
var postcss = require('postcss');
 
var css = fs.readFileSync('test.css', 'utf8');
postcss().use(
  autoprefixer.postcss
).use(
  separator.postcss
).process(css, options);

Grunt Plugin

There is also a grunt module available: see grunt-postcss-separator

License

Copyright (c) 2015 Sebastian Fitzner. Licensed under the MIT license.

ToDos

• Add tests
• Add further plugin compatibility for PostCSS