css images to base64 and fix ie6/7

css-to-base64

/**
 * Created with IntelliJ IDEA.
 * @author: butian.wth
 * @version: 1-0-0
 * Date: 14-5-27
 * Time: 下午5:23
 */

//new Buffer("Hello World").toString('base64')

var path = require('path');
var fs = require('fs');

var Walker = require('iwalk');

var ignoresList = ['node_modules'];

var reg = /(background:|background-image:)url\((.*?)\)([^;]*?)(}|;}|;.*?})/ig;

function parse(filename) {
    var text = fs.readFileSync(filename).toString();
    var matched;
    var list = [];
    while ((matched = reg.exec(text))) {
        //console.log(matched[2]);
        if (matched[2].indexOf('images') >= 0) {
            list.push({
                origin: matched[0],
                backgroundType: matched[1],
                item: matched[2].trim(),
                afterUrl: matched[3],
                afterBackground: matched[4],
                filename: filename,
                index: matched.index
            });
        }
    }
    list.forEach(function (item) {
        var ext = path.extname(item.item).replace('.','');
        item.picFile = fs.readFileSync('./src/' + item.item);
        item.base64 = new Buffer(item.picFile).toString('base64');
        item.base64 = 'data:image/' + ext + ';base64,' + item.base64;
        text = text.replace(item.origin, item.backgroundType + 'url(' + item.base64 + ')' + item.afterUrl + ';' + '*background-image:url(' + item.item + ');' + item.afterBackground);
    });
    //console.log(text);
    fs.writeFileSync(filename, text);
    return list;
};

var list = [];
var walker = new Walker();
var ignoresReg = new RegExp('\/(' + ignoresList.join('|') + ')\/', "ig");
walker.on('file', function (filename) {
    if (filename.match(ignoresReg)) {
        return;
    }
    var ext = path.extname(filename);
    if (ext === '.css') {
        list = list.concat(parse(filename));
    }
    console.log('base64转换成功');
});
walker.on('error', function (err) {
    walker.removeAllListeners('error');
    console.log('stop by error!!');
});
walker.on('end', function () {

});
walker.walk('./build');