codenothing/CSSCompressor

/**
 * 
 * None Conversions
 * 
 * @author: Corey Hart <http://www.codenothing.com>
 * @description: Converts none values to zeroes for allowed properties
 * 
 * @before:
 *     .example {
 *         border: none;
 *     }
 * 
 * @after:
 *     .example {
 *         border: 0;
 *     }
 * 
 */

var CSSCompressor = global.CSSCompressor,
    rnoneprop = /^(border|background|border-(top|right|bottom|left))$/i;

CSSCompressor.rule({

    name: 'None Conversions',
    type: CSSCompressor.RULE_TYPE_RULE,
    group: 'Misc',
    description: "Converts none values to zeroes for allowed properties",

    callback: function( rule, block, compressor ) {
        if ( rnoneprop.exec( rule.property ) && rule.parts.length === 1 && rule.parts[ 0 ].toLowerCase() == 'none' ) {
            compressor.log(
                "Converting color to short hex '" + rule.parts[ 0 ] + "' => '0'",
                rule.position
            );

            rule.parts = [ '0' ];
        }
    }

});