styled-components/src/vendor/postcss-safe-parser/parse.js

**This is a work in progress** based off of [this demo](https://github.com/geelen/css-components-demo).

import Input from '../postcss/input';

import SafeParser from './safe-parser';

export default function safeParse(css, opts) {
    let input = new Input(css, opts);

    let parser = new SafeParser(input);
    parser.tokenize();
    parser.loop();

    return parser.root;
}