codenothing/CSSCompressor

/**
 * 
 * RGB to Hex
 * 
 * @author: Corey Hart <http://www.codenothing.com>
 * @description: Converts RGB to Hex code
 * 
 * @before:
 *     .example {
 *         color: rgb(214,123,214);
 *     }
 * 
 * @after:
 *     .example {
 *         color: #d67bd6;
 *     }
 * 
 */

var CSSCompressor = global.CSSCompressor,
    rrgb = /^rgb\(\s*(\d{1,3}\%?(\s*,\s*\d{1,3}\%?\s*,\s*\d{1,3}\%?)?)\s*\)$/i,
    HEX = '0123456789abcdef';

CSSCompressor.rule({

    name: 'RGB to Hex',
    type: CSSCompressor.RULE_TYPE_VALUE,
    group: 'Color',
    description: "Converts RGB to Hex code",

    callback: function( value, position, compressor ) {
        var m = rrgb.exec( value ),
            str = '#', values;

        if ( m ) {
            // Create array of r,g,b values
            if ( m[ 1 ].indexOf( ',' ) > -1 ) {
                values = m[ 1 ].split( ',' );
            }
            else {
                values = [ m[ 1 ], m[ 1 ], m[ 1 ] ];
            }

            // Convert each value to it's hex form
            values.forEach(function( v ) {
                v = v.trim();

                // Convert entry to integer
                if ( v.indexOf( '%' ) > -1 ) {
                    v = parseInt( v.substr( 0, v.length - 1 ), 10 );
                    v = parseInt( ( v / 100 ) * 255, 10 );
                }
                else {
                    v = parseInt( v, 10 );
                }

                // Enforce Max/Min
                if ( v > 255 ) {
                    v = 255;
                }
                else if ( v < 0 ) {
                    v = 0;
                }

                str += HEX[ ( v - ( v % 16 ) ) / 16 ];
                str += HEX[ v % 16 ];
            });

            // Log and convert
            compressor.log(
                "Converting RGB to Hex code '" + value + "' => '" + str + "'",
                position
            );
            return str;
        }
    }

});