RTLCSS for PHP

RTLCSS is a framework for converting Left-To-Right (LTR) Cascading Style Sheets(CSS) to Right-To-Left (RTL).

Usage

Installation using composer

Add the library to your composer.json

{
    "repositories": [{
        "type": "vcs",
        "url": "https://github.com/moodlehq/rtlcss-php"
    }],
    "require-dev": {
        "moodlehq/rtlcss-php": "*"
    }
}

Flipping

$parser = new Sabberworm\CSS\Parser($css);
$tree = $parser->parse()
$rtlcss = new MoodleHQ\RTLCSS\RTLCSS($tree);
$rtlcss->flip();
echo $tree->render();

For parsing options and rendering, refer to Sabberworm/PHP-CSS-Parser.

Output sample

.div {
    direction: ltr;
    left: 10px;
    border: 10px 5px 0px 2px;
    float: left;
}

Becomes:

.div {
    direction: rtl;
    right: 10px;
    border: 10px 2px 0px 5px;
    float: right;
}

Options

You can prefix your CSS with comments starting with /*rtl:*/ for special handling.

Do not flip values

Prepend with /*rtl:ignore*/, or wrap within /*rtl:begin:ignore*/ and /*rtl:end:ignore*/.

.div {
    /*rtl:ignore*/
    float: left;
    left: 10px;
}
.div {
    direction: ltr;
    /*rtl:begin:ignore*/
    float: left;
    left: 10px;
    /*rtl:end:ignore*/
}

Becomes:

.div {
    float: left;
    right: 10px;
}
.div {
    direction: rtl;
    float: left;
    left: 10px;
}

Remove CSS

Prepend with /*rtl:remove*/, wrap within /*rtl:begin:remove*/ and /*rtl:end:remove*/.

.div {
    /*rtl:remove*/
    float: left;
    left: 10px;
}
.div {
    direction: ltr;
    /*rtl:begin:remove*/
    float: left;
    left: 10px;
    /*rtl:end:remove*/
}

Becomes:

.div {
    right: 10px;
}
.div {
    direction: rtl;
}

Additional CSS

Write the CSS in a content starting with /*rtl:raw:.

.div {
    /*rtl:raw:
        text-align: left;
    */
    float: left;
}

Becomes:

.div {
    text-align: left;
    float: right;
}

Limitation

Currently the comments must always precede a statement, they will not work if they are not followed by anything.

Valid:

.div {
    /*rtl:raw:
        text-align: left;
    */
    float: left;
}

Invalid:

.div {
    float: left;
    /*rtl:raw:
        text-align: left;
    */
}

CSS support

A lot of common CSS rules are supported, however a few complex ones are not. To get a grasp of what is supported and what isn't, please refer to the test cases. Unsupported scenarios are marked to be skipped.

About this tool

This tool is very heavily inspired by MohammadYounes/rtlcss, even though at this stage it does not include all of its features. See this library as a partial port of the latter.

Credits

• MohammadYounes/rtlcss for being the example we followed.
• Sabberworm/PHP-CSS-Parser for parsing CSS in PHP.

License

Licensed under the MIT License.