Right-to-Left

Right-to-left done right with Sass

Right-to-left makes supporting right-to-left languages in Sass super simple. Use the provided mixins instead of their belonging CSS declarations and you're done!

Provided mixins

Alignment

• text-align($value)

Border

• border-bottom-left-radius($value)
• border-bottom-right-radius($value)
• border-color($top, $right: null, $bottom: null, $left: null)
• border-left($value)
• border-left-color($value)
• border-left-style($value)
• border-left-width($value)
• border-radius($topLeft, $topRight: null, $bottomRight: null, $bottomLeft: null)
• border-right($value)
• border-right-color($value)
• border-right-style($value)
• border-right-width($value)
• border-style($top, $right: null, $bottom: null, $left: null)
• border-top-left-radius($value)
• border-top-right-radius($value)
• border-width($top, $right: null, $bottom: null, $left: null)

Margin

• margin($top, $right: null, $bottom: null, $left: null)
• margin-left($value)
• margin-right($value)

Padding

• padding($top, $right: null, $bottom: null, $left: null)
• padding-left($value)
• padding-right($value)

Positioning

• float($value)
• left($value)
• right($value)

API

Functions

Right-to-left uses the following low-level functions to implement its right-to-left support.

• extract-1-to-4-values($one, $two: null, $three: null, $four: null)

  Returns a Sass List containing four values conforming to CSS specifications regarding the number of arguments of 1-to-4 declarations: if it is passed four values, they are returned as-it; if $four is missing, it is the same as $two; if $three is missing, it is the same as $one; if $two is missing, it is the same as $one.

Mixins

Right-to-left uses the following low-level mixins to implement its right-to-left support. Feel free to use them to provide right-to-left support to declarations that are not (yet ^^) supported by rtl-sass.

• declaration($property, $leftToRightValue, $rightToLeftValue)

  The lowest-level API mixin, called by all other mixins of the rtl-sass API. Provides right-to-left support by explicitly passing ltr and rtl values.

  To mimic the hypothetical CSS declaration...

  [dir="ltr"] .dummy {
      dummy-property: left-to-right-value;
  }
  
  [dir="rtl"] .dummy {
      dummy-property: right-to-left-value;
  }
  

  ...this mixin would be called with the following form:

  @include declaration(dummy-property, left-to-right-value, right-to-left-value);

• declaration-1-to-4($property, $top, $right: null, $bottom: null, $left: null)

  Used to provide right-to-left support for side-related declarations using 1-to-4 value syntax - for example margin: 20px 10px. This mixin conforms to CSS specifications regarding the number of arguments: if it is passed four values, they set top, right, bottom and left in that order; if $left is missing, it is the same as $right; if $bottom is missing, it is the same as $top; if $right is missing, it is the same as $top.

  $property can be either a Sass String or a Sass List. In the latter case, the first element of the list is considered as the property prefix and the second one (if any) as the property suffix. Any additional element of the list is ignored.

  To add right-to-left support for the hypothetical CSS declaration dummy: 20px 10px 5px 0px, this mixin would be called with one of the following forms:

  @include declaration-1-to-4(dummy, 20px, 10px, 5px, 0px);

  @include declaration-1-to-4((dummy), 20px, 10px, 5px, 0px);

  ...and would compile into:

  .test {
      dummy-top: 20px;
      dummy-bottom: 5px;
  }
  
  [dir=ltr] .test {
      dummy-right: 10px;
      dummy-left: 0;
  }
  
  [dir=rtl] .test {
      dummy-right: 0;
      dummy-left: 10px;
  }   
  

  To add right-to-left support for the hypothetical CSS declaration dummy-width: 20px 10px 5px 0px, this mixin would be called with the following form...

  @include declaration-1-to-4((dummy, width), 20px, 10px, 5px, 0px);

  ...and would compile into:

  .test {
      dummy-top-width: 20px;
      dummy-bottom-width: 5px;
  }
  
  [dir=ltr] .test {
      dummy-right-width: 10px;
      dummy-left-width: 0;
  }
  
  [dir=rtl] .test {
      dummy-right-width: 0;
      dummy-left-width: 10px;
  }
  

• declaration-1-to-4-corner($property, $topLeft, $topRight: null, $bottomRight: null, $bottomLeft: null)

  Used to provide right-to-left support for corner-related declarations using 1-to-4 value syntax - for example border-radius: 20px 10px. This mixin conforms to CSS specifications regarding the number of arguments: if it is passed four values, they set top-left, top-right, bottom-right and bottom-left in that order; if $bottomLeft is omitted it is the same as $topRight; if $bottomRight is omitted it is the same as $topLeft; if $topRight is omitted it is the same as $topLeft.

  $property can be either a Sass String or a Sass List. In the latter case, the first element of the list is considered as the property prefix and the second one (if any) as the property suffix. Any additional element of the list is ignored.

  To add right-to-left support for the hypothetical CSS declaration dummy: 20px 10px 5px 0px, this mixin would be called with one of the following forms:

  @include declaration-1-to-4-corner(dummy, 20px, 10px, 5px, 0px);

  @include declaration-1-to-4-corner((dummy), 20px, 10px, 5px, 0px);

  ...and would compile into:

  [dir=ltr] .test {
      dummy-top-left: 20px;
      dummy-top-right: 10px;
      dummy-bottom-right: 5px;
      dummy-bottom-left: 0;
  }
     
  [dir=rtl] .test {
      dummy-top-left: 10px;
      dummy-top-right: 20px;
      dummy-bottom-right: 0;
      dummy-bottom-left: 5px;
  }
  

  To add right-to-left support for the hypothetical CSS declaration dummy-radius: 20px 10px 5px 0px, this mixin would be called with the following form...

  @include declaration-1-to-4-corner((dummy, radius), 20px, 10px, 5px, 0px);

  ...and would compile into:

  [dir=ltr] .test {
      dummy-top-left-radius: 20px;
      dummy-top-right-radius: 10px;
      dummy-bottom-right-radius: 5px;
      dummy-bottom-left-radius: 0;
  }
  
  [dir=rtl] .test {
      dummy-top-left-radius: 10px;
      dummy-top-right-radius: 20px;
      dummy-bottom-right-radius: 0;
      dummy-bottom-left-radius: 5px;
  }
  

• declaration-value($property, $value)

  Used to provide right-to-left support for declarations where the position is the value of the property - for example text-align: left.

  To add right-to-left support for the hypothetical CSS declaration dummy: left, this mixin would be called with the following form:

  @include declaration-value(dummy, left);

How to use

First, install rtl-sass:

npm i rtl-sass --save-dev

Then import the mixins into your Sass file:

@import "{relative/path/to/node_modules}/rtl-sass/src/rtl";

Contributing

• Fork the main repository
• Code
• Implement tests using node-tap
• Issue a pull request keeping in mind that all pull requests must reference an issue in the issue queue

License

Apache-2.0 © Eric MORAND