codenothing/CSSCompressor

/**
 * 
 * Leading Zeroes
 * 
 * @author: Corey Hart <http://www.codenothing.com>
 * @description: Removes unecessary leading zeroes from values
 * 
 * @before:
 *     .example {
 *         left: 0.2px;
 *     }
 * 
 * @after:
 *     .example {
 *         left: .2px;
 *     }
 * 
 */

var CSSCompressor = global.CSSCompressor,
    rzero = /^(\+|\-)?0(\.\d+)(\%|[a-z]{2})?$/i;

CSSCompressor.rule({

    name: 'Leading Zeroes',
    type: CSSCompressor.RULE_TYPE_VALUE,
    group: 'Numeric',
    description: "Removes unecessary leading zeroes from values",

    callback: function( value, position, compressor ) {
        var m = rzero.exec( value ),
            before = value;

        if ( m ) {
            value = ( m[ 1 ] ? m[ 1 ] : '' ) + m[ 2 ] + ( m[ 3 ] ? m[ 3 ] : '' );

            compressor.log(
                "Removes unecessary leading zeroes '" + before + "' => '" + value + "'",
                position
            );
            return value;
        }
    }

});