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PostCSS plugin to transform start/end properties to left/right depending on LTR or RTL writing directions of the document

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ahmadalfy/postcss-logical-properties

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Transform start/end properties to left/right depending on LTR or RTL writing directions of the document. Currently supporting:

float: inline-start || inline-end
clear: inline-start || inline-end
text-align: start || end

More information about logical properties can be on the CSS Working Group Logical Porprties Draft

Install

With npm do:

npm install postcss-logical-properties --save-dev

Example

Input

element {
  float: inline-start;
}

Output

element {
  float: left; /* In case the direction of the document is ltr */
  float: inline-start;
}

Usage

Use with grunt-postcss

grunt.initConfig({
  postcss: {
    options: {
      ...
      processors: [
        require('postcss-logical-properties')()
      ]
    }
  }
});

Options

Type: Object | Null Default: {rootDir: 'ltr', replace: false, html: true}

  • rootDir the root element direction. Can be ltr or rtl. PostCSS-logical-properties also tries to get the root direction from CSS (html or :root) and overrides this option. Use html option to disable this behaviour.
  • replace replaces rules containing the logical properties instead of adding fallbacks.
  • html overrides root direction from CSS html {} or :root {}

Roadmap

  • Add support for logical directional values: block-start and block-end.
  • Add support for logical values of the text-align property (start and end).
  • Add support for logical margins and offsets: the margin- and offset- (block-start, block-end, inline-start and inline-end properties).
  • Add support for logical padding and border: the padding- and border-*- (block-start, block-end, inline-start and inline-end properties).
  • Add support for shorthand properties with logical Keyword (padding, margin).
  • Add option to create fallbacks for the opposite direction of the document.
  • Write tests

Contributing

Pull requests are welcome. If you add functionality, then please add unit tests to cover it.

License

MIT © Ahmad Alfy

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PostCSS plugin to transform start/end properties to left/right depending on LTR or RTL writing directions of the document

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