Postcss-onlyrtl NPM

PostCSS-ONLY-RTL

PostCSS-plugin for RTL-adaptivity

Generates RTL rules with flipped properties. Use one file for both directions!

Examples

Running Exapme Can be found here.

#processing-directives

Simple properties

In most cases all you need is flip property name or value from left to right or change values order in full-valued shorthand from top-right-bottom-left to top-left-bottom-right.

LTR input:

.foo {
    float: right;
    margin-left: 13px;
    text-align: right;
    font-size: 13px;
    border-color: lightgray;
    border-width: 2px 0 2px 2px;
    border-style: solid dashed solid solid
}

.foo {
    text-align: center;
}

LTR+RTL output:

LTR will remain same, only RTL will have a new attribute. 

[dir="rtl"] .foo {
    float: left;
    text-align: right;
}

Animations

Flippable keyframes-animations will be splitted to two direction-based rules with -ltr or -rtl suffixes

LTR input:

.foo {
    animation: 1s slide 0s ease-in-out
}

@keyframes slide {
    from {
        transform: translate( -1000px )
    }
    to {
        transform: translate( 0 )
    }
}

LTR+RTL output:

[dir="ltr"] .foo {
    animation: 1s slide-ltr 0s ease-in-out
}

[dir="rtl"] .foo {
    animation: 1s slide-rtl 0s ease-in-out
}

@keyframes slide-ltr {
    from {
        transform: translate( -1000px )
    }
    to {
        transform: translate( 0 )
    }
}

@keyframes slide-rtl {
    from {
        transform: translate( 1000px )
    }
    to {
        transform: translate( 0 )
    }
}

Value directives

To transform declaration values use value directives:

/* rtl:prepend:{value} */ - to prepend the {value} before the current value
/* rtl:append:{value} */ - to append the {value} after the current value
/* rtl:{value} */ - to replace the current value with the supplied value

Source

.foo {
    font-weight: bold;
    font-family: "Droid Sans", "Helvetica Neue", Arial, sans-serif/*rtl:prepend:"Droid Arabic Kufi",*/;
    transform: rotate(45deg)/* rtl:append: scaleX(-1) */;
    flex-direction: row/* rtl: row-reverse */;
}

Result

.foo {
    font-weight: bold;
}

[dir=ltr] .foo {
    font-family: "Droid Sans", "Helvetica Neue", Arial, sans-serif/*rtl:prepend:"Droid Arabic Kufi",*/;
    transform: rotate(45deg)/* rtl:append: scaleX(-1) */;
    flex-direction: row/* rtl: row-reverse */;
}

[dir=rtl] .foo {
    font-family: "Droid Arabic Kufi", "Droid Sans", "Helvetica Neue", Arial, sans-serif;
    transform: rotate(45deg) scaleX(-1);
    flex-direction: row-reverse;
}

Property directives

To transform declaration property name use property directives:

/* rtl:as:{prop} */ - to process the property as {prop}. Usable for custom properties

Source

:root {
    --padding /* rtl:as:padding */: 1rem 2rem 3rem 4rem;
}

Result

[dir=ltr]:root {
    --padding /* rtl:as:padding */: 1rem 2rem 3rem 4rem;
}

[dir=rtl]:root {
    --padding /* rtl:as:padding */: 1rem 4rem 3rem 2rem;
}

Ignoring specific declarations

To skip flipping specific declarations use some of supported directives:

/* rtl:ignore */ - to ignore the following rule or the containing declaration
/* rtl:begin:ignore */ and /* rtl:end:ignore */ - to ignore rules within scope

Ignore one rule:

/* rtl:ignore */
.foo {
    padding-left: 0
}

Block-syntax to ignore rules within scope:

/* rtl:begin:ignore */
.foo {
    padding-left: 0
}
.bar {
    direction: ltr
}
/* rtl:end:ignore */

Value-syntax to ignore a single CSS declaration:

.foo {
    margin-left: 20px;
    padding-right: 20px /* rtl:ignore */;
}

/*! notation will work too:

/*! rtl:ignore */
.foo {
    padding-left: 0
}

Usage

Plug it to PostCSS

const postcss = require('postcss')
const rtl = require('postcss-rtl')

postcss([ rtl( options ) ])

See PostCSS docs for examples for your environment.

Manage direction by switching between dir="ltr" and dir="rtl" on <html> element.

With Webpack:

module.exports = {
  module: {
    rules: [ {
      test: /\.css$/,
      use: [
        { loader: 'style-loader' },
        { loader: 'css-loader' },
        { loader: 'postcss-loader',
          options: {
            plugins: function () {
              return [ require( 'postcss-rtl' )( options ) ]
            }
          }
        }
      ]
    } ]
  }
}

With Gulp:

gulp.src( 'style.css' )
    .pipe( postcss( [ rtl( options ) ]) )
    .pipe( gulp.dest( './dest' ) )

Options

addPrefixToSelector: Custom function for adding prefix to selector. Optional. Example:
```
function addPrefixToSelector ( selector, prefix ) {
    return `${prefix} > ${selector}` // Make selectors like [dir=rtl] > .selector
}
```
note: the returned string must include prefix to avoid an infinite recursion
onlyDirection: generate only one-direction version: ltr or rtl
prefixType: Switches between adding attributes and classes. Optional:
- attribute (by default, recommended): .foo => [dir=rtl] .foo
- class (useful for IE6): .foo => .dir-rtl .foo
prefix: Uses a custom string, instead of 'dir', for the added attribute and class selectors
- e.g. 'data-my-custom-dir' (for attribute prefixType): .foo => [data-my-custom-dir=rtl] .foo
- e.g. 'my-custom-dir' (for class prefixType): .foo => .my-custom-dir-rtl .foo
removeComments (default: true): remove rtl:* comments after process them
fromRTL (default: false): assume all styles are written in RTL direction and generate corresponding LTR styles for them
blacklist: the array of css properties which processing will be ignored Example:
```
['padding-left', 'padding-right']
```
whitelist: the array of css properties which (and only them) will be processed Example:
```
['margin', 'border-color']
```