inStyle

inStyle is a CSS authoring tool to append, insert or replace elements in the current selector (&), giving you an intuitive way to style the current element based on parent variants without repeating complex queries. Enables fully nested CSS writing styles and wealth of one's soul.

Article: https://css-tricks.com/instyle-current-selector-sass/

Currently available for SASS 3.4+ and PostCSS.

What's new in 1.6.3:

• libsass 3.4+ compatibility (thanks andrezrv)

1) Append

Appending a state to an existing parent is done with the < special character. Each additional use of this character targets a higher parent (works the same for all features).

.my-app
  display: block

  .widget
    border-radius: 5px

    &.blue
      color: blue

    .isIE6 &
      background-image: url("fake-borders.png")

    +in('<.expanded')
      color: red // .my-app.expanded .widget { };

    @media (max-width: 768px)
      float: left

You can also explicitly mention the compound selector, which is useful for filtering out undesired multiselector parents. May also be preferential for readability.

ul, ol
  list-style: none

  li
    display: inline-block

    a
      text-decoration: underline

      +in('ol.links')
        color: orange // ol.links li a { };

2) Insert

Inserting a new selector at a certain position above the current element is done with the ^ special character.

.container
  display: flex

  div
    flex: 1

    span
      color: red

      +in('^.upside-down')
        transform: rotate(180deg) // .container div .upside-down span { };

      +in('^^[class^=foo]')
        content: 'bar' // .container [class^=foo] div span { };

table
  table-layout: fixed

  thead
    font-weight: normal

  tr
    height: 30px

    +in('^thead')
      height: 50px // table thead tr { };

3) Replace

Replacing a certain selector is done using the @ character. Multiselectors that become duplicit due to the replacement are removed from the rendered selector.

ul, ol
  list-style: none

  li
    display: inline-block

    a
      text-decoration: underline

      +in('@.cool')
        background: pink // ul .cool a, ol .cool a { };

      +in('@@.special-list')
        color: orange // .special-list li a { };

Features

• Infinitely nestable
• Any amount of modifications separated by a space
• Accepts multiselectors separated by a comma
• Validates all CSS input by SASS internal selector-parse()
• Order of modifications makes no difference, RTL priority

Options

Change any of the special characters to your preference by setting the following global variables:

$__inTagAppend: '<'
$__inTagInsert: '^'
$__inTagReplace: '@'

Installation

@import 'node_modules/inStyle/src/instyle' in your SASS/SCSS stylesheet.

npm install inStyle
bower install inStyle

Tests

npm install
npm run test

Roadmap

• Stylus port (blocked by #1703)