less px2rem function

px2rem.mixin.less

@base-font-size: 100;
.rem (@property; @values...) {

  // This is a workaround, inspired by https://github.com/borodean/less-properties
  @{property}: ~`(function () {
    var baseFontSize=@{base-font-size};
    var sizeList = @{values};
    if (!Array.isArray(sizeList)) {
    	sizeList = [sizeList];
    }
    var rems = [];
    for (var i = 0; i < sizeList.length; i++) {
    	rems.push(Math.round(sizeList[i] / baseFontSize * 1000000) / 1000000 + 'rem');
    }
    return rems.join(' ');
  }())`;
}

.some-class {
  .rem(font-size, 14);
  .rem(margin, 10, 0, 10, 20)
}