Just a few days ago researcher Emil Wallner from France has posted this blogpost: Turning Design Mockups Into Code With Deep Learning. He even posted links to code repos on Github, having names like Screenshot--to-Code and pix2code.
So you might use this if you are a deep learning expert (I'm not). In their READMEs, these Github repos have links to Showcasing sites.
The blogpost mentions other tools, e.g. Airbnb's sketch2code, but I havent'l looked at any of this material.