On Sunday, November 10, 2013 1:43:55 PM UTC-6, Edward K. Ream wrote:
>
>
> Step 2 of the vim project is now complete.
>
And 20 hours later, the framework for step 3 is in place! See rev 6265.
A recent rev added @file leoVim.py to LeoPyRef.leo, so it's now easy to see
the code.
Only two vim-related methods work: vim_h (move cursor left) and vim_l (move
cursor right). But they demonstrate *all* the essential features of the
framework.
vc.exec_ executes the command discovered by vc.scan. Here it is::
def exec_(self,command,n1,n2,motion):
d = self.commands_d.get(command,{})
command_name = d.get('command_name')
func = self.dispatch_d.get(command_name,self.oops)
# Set ivars describing the command.
self.command = command
self.func = func
self.n1 = n1
self.n2 = n2
self.motion = motion
# Call the handler.
func()
No if statements!
The first three lines get the spelling of commands and their format from
@data nodes, and then associate command spellings with vc methods. Elegant,
and *very* fast.
vc.exec_ then sets ivars describing the command and calls the proper
method. If would also be possible to pass these as arguments to the vim_xxx
methods, but perhaps setting ivars is a little more flexible.
As I write this, I see that exec_ should probably handle n1 (the over-all
repeat count). There will be many such jiggles, but each will be easy to
fix because of the extreme simplicity of the framework.
Finally, vim_h and vim_l just call the corresponding c.editCommands
methods. Having distinct vim_xxx methods provides the perfect place for
any "wrapping" or "tweaking" that may be required.
This is clearly the simplest scheme that could possibly work. I'm thrilled
with it. Take a look at the code: you will see that it is dirt simple.
Edward
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