codenothing/CSSCompressor

/**
 * 
 * Empty Values
 * 
 * @author: Corey Hart <http://www.codenothing.com>
 * @description: Removes properties that don't have values
 * 
 * @before:
 *     .example {
 *         color: red;
 *         font-size:;
 *     }
 *
 * 
 * @after:
 *     .example {
 *         color: red;
 *     }
 * 
 */

var CSSCompressor = global.CSSCompressor;

CSSCompressor.rule({

    name: 'Empty Values',
    type: CSSCompressor.RULE_TYPE_BLOCK,
    group: 'Trim',
    description: "Removes properties that don't have values",
    priority: CSSCompressor.PRIORITY_LOWEST,

    callback: function( branch, compressor ) {
        if ( ! branch.rules || ! branch.rules.length ) {
            return;
        }

        for ( var i = -1, rule; ++i < branch.rules.length; ) {
            rule = branch.rules[ i ];

            if ( ! rule.parts.length || rule.parts.join( '' ).trim().length < 1 ) {
                compressor.log(
                    "Removing empty value with property key '" + rule.property + "'",
                    [ rule.position ]
                );
                CSSCompressor.removeItem( branch.rules, rule );
                i--;
            }
        }
    }

});