src/node_modules/clean-css/lib/optimizer/clone.js

var wrapSingle = require('./wrap-for-optimizing').single;

var Token = require('../tokenizer/token');

function deep(property) {
  var cloned = shallow(property);
  for (var i = property.components.length - 1; i >= 0; i--) {
    var component = shallow(property.components[i]);
    component.value = property.components[i].value.slice(0);
    cloned.components.unshift(component);
  }

  cloned.dirty = true;
  cloned.value = property.value.slice(0);

  return cloned;
}

function shallow(property) {
  var cloned = wrapSingle([
    Token.PROPERTY,
    [Token.PROPERTY_NAME, property.name]
  ]);
  cloned.important = property.important;
  cloned.hack = property.hack;
  cloned.unused = false;
  return cloned;
}

module.exports = {
  deep: deep,
  shallow: shallow
};