scribble-foreach-experiment

README

scribble-foreach-experiment

Foreach primitive experiment with Scribble Go API.

proto

Foreach loop states (current index, number of iterations) are kept in memory during execution as a package-scope stack. The basic algorithm is as follows:

1. The stack fes (foreach stack) is initialised with protocol package
2. A foreach state s0 is entered, either
   • User calls s0.Foreach(), either
     • (First time) New foreach pushed on fes setting number of iterations, current = 1
     • (Subsequent) increment current, check that current is < number of iterations,
       • Loop body follows from Foreach(), when reached end of body, go back to s0
   • User calls s0.EndForeach(), check that current = number of iterations, then pop fes

Some potential improvements:

• The protocol package proto cannot be used concurrently, this should be changed in the final implementation such that fes is attached to the instance of protocol (e.g. initialised with Proto.New())
• HasNext and Foreach are clumsy