Ask HN: Network and context diagrams scripting (Visio alternatives)

Are you aware of any tools or languages to script network and other types of diagrams (as Visio alternatives). The scripting part would be something similar to: - [Machine A] connected to [Server A] - [Server A] connected to [Server B] through [Firewall A] - [User A] connects to [Image A] - [Box A] = [[Machine A], [Server A], [User A], [Image A] - [Box A] = {title: .., backgroundColor: ...} Rendering would perhaps generate SVG and similar formats.