VGL to VFL Compiler 
This library compiles GSS's Visual Grid Language (VGL) statements into GSS-flavored VFL statements.
Background
The intention of VGL is feature parity with W3C's Grid Layout Module, but built atop of the constraint-based language primitives implemented in GSS and established in Apple's Visual Format Language (VFL) and Greg Badros's Constraint CSS (CCSS).
CCSS is a language for relative property constraints.
VFL is a language for 1-dimensional alignments of elements.
VGL is a language for 2-dimensional grid-based design.
Documentation
Coming soon...