PFL Syntax

PFL.out -- the interpreter, reads a PFL source program from standard input.

[Examples/] -- example PFL programs

processes:
   process1 || process2          p1 and p2 in parallel
   process1 |  process2          choice of either p1 or p2
   action -> process             sequence
   stop                          null process

NB. there is a (typical) restriction that
   `||' below `|', eg. (p1||p2)|p3, is not allowed.

actions:
   channel ? variable            input  action
   channel ! expression          output action

channels:
   let c=chan in ...             `chan' returns a new channel
   output                        standard ouput channel
   input                         standard input channel

Otherwise the non-process part of the language is as for [λ FP].

NB.   ->   is the sequencing, "then do" operator, nothing at all to do with function-types or the definition of functions as in Haskell.

[Refs].