Figure out how to handle output in all frameworks

[asmaloney]

The "print" and "write" statements need to be implemented in pyactr and vanilla if possible.

If not possible, then they may need to be removed as "do statements".

[asmaloney]

It looks like pyactr doesn't have the capability to output arbitrary text during a production.

It does, however, have a way to execute a function on a buffer:

!goal>
	show <slot name>

(This show command is limited to outputting one slot from the given buffer.)

So we might be able to make this work with some hacking by injecting a new method onto Buffer:

import types
from pyactr.buffers import Buffer

def print_text(self,text):
	print( text )

Buffer.print_text = types.MethodType(print_text, Buffer)

...and then calling it in the production like so:

!goal>
	print_text foo

In order to handle our print statement print 42, ?other, "blat", we need to:

• handle numbers and strings (should be straightforward with some python magic?)
• determine which vars are used and from which buffers
• figure out how to access their values through python

I think we can do this by first determining which buffer the var is from, then figuring out the slot name the var relates to, and passing it in instead of the var name?

Not sure if this will work if we want to output vars from two different buffers in one print statement...

[asmaloney]

vanilla now handles print properly as of d5303b9.

pyactr can now output simple strings (no variables), but only once per production. Will output warnings in the output.

[asmaloney]

Related pyactr issue: Output a variable within a production?

[asmaloney]

All but one thing (#66) working across all three frameworks.