codenothing/CSSCompressor

/**
 * 
 * Font Weight Conversion
 * 
 * @author: Corey Hart <http://www.codenothing.com>
 * @description: Converts font weight strings to their numeric counterparts
 * 
 * @before:
 *     .example {
 *         font-weight: normal;
 *     }
 * 
 * @after:
 *     .example {
 *         font-weight: 400;
 *     }
 * 
 */

var CSSCompressor = global.CSSCompressor,
    rfontweightprop = /^font-weight|font$/,
    table = CSSCompressor.tables[ 'Font Weight Conversion' ] = {
        normal: '400',
        bold: '700'
    };

CSSCompressor.rule({

    name: 'Font Weight Conversion',
    type: CSSCompressor.RULE_TYPE_RULE,
    group: 'Font',
    description: "Converts font weight strings to their numeric counterparts",

    callback: function( rule, branch, compressor ) {
        if ( ! rfontweightprop.exec( rule.property ) || ! rule.parts || ! rule.parts.length ) {
            return;
        }

        rule.parts.forEach(function( part, index ) {
            if ( table[ part.toLowerCase() ] ) {
                rule.parts[ index ] = table[ part.toLowerCase() ];

                compressor.log(
                    "Compressing font weight property '" + part + "' => '" + rule.parts[ index ] + "'",
                    rule.position
                );
            }
        });
    }

});