Hi Bram and all,
2016/7/10 Sun 3:49:40 UTC+9 Bram Moolenaar wrote:
> Ken Takata wrote:
>
> [...]
>
> > > I do think that the backslash (or any other special character that might
> > > be available) makes it ugly.
> > >
> > > Although we can find the end of the expression without the "}", mistakes
> > > will be very hard to figure out. Also reading back a lambda that's
> > > passed as an agument to a function with many arguments will make the {}
> > > part easy to spot. I have done this in Zimbu and I'm happy with how it
> > > looks.
> > >
> > > I don't think it's hard to implement: When finding a "{" look forward,
> > > skipping over [a-zA-Z0-9 ], if "->" is found it's a lambda.
> >
> > Here is an experimental patch:
> >
> > https://bitbucket.org/k_takata/vim-ktakata-mq/src/90ea467da862bc2eaf59454f75b8faea34604a1e/lambda2.patch?fileviewer=file-view-default
> >
> > * Support only one expression.
> > * The "a:" prefix cannot be omitted.
> > * No closures.
> > * Inefficient "{" parser.
> >
> > Both mattn's patch and ZyX's code are partly used.
> > Nested lambdas are also supported like ZyX's example:
> >
> > :echo {a -> {tmp -> [a:tmp, a:tmp + 2, a:tmp + 5]}(a:a * 5)}(2)
> > [10, 12, 15]
> >
> > Hmm, it's hard to read.
>
> Thanks for making the patch. I think at a high level it looks good.
>
> Like I mentioned, I don't think we should require "a:arg", just "arg".
> Perhaps in the function, instead of using a dict for local variables,
> use the dict for arguments. After all, there are no local variables.
>
> Seeing the documentation, and perhaps a few tests, may trigger some fine
> tuning. So I hope you can do that.
I have updated the experimental patch:
https://bitbucket.org/k_takata/vim-ktakata-mq/src/6d421eab8842ba93c115d57c42fd9eabfa328851/lambda2.patch?fileviewer=file-view-default
Changes from the previous patches are:
* Supports both "a:arg" and "arg". Named arguments are also added to the "l:"
dictionary.
* Document update.
Maybe the following patch is also needed:
https://bitbucket.org/k_takata/vim-ktakata-mq/src/6d421eab8842ba93c115d57c42fd9eabfa328851/func-refcount.patch?fileviewer=file-view-default
This fix the reference counters for callbacks.
Lambda examples:
:echo map([1, 2, 3], {idx, val -> val + 1})
[2, 3, 4]
:echo sort([3,7,2,1,4], {a, b -> a - b})
[1, 2, 3, 4, 7]
:echo {a -> {tmp -> [tmp, tmp + 2, tmp + 5]}(a * 5)}(2)
[10, 12, 15]
:let timer = timer_start(500,
\ {-> execute("echo 'Handler called'", "")},
\ {'repeat': 3})
Handler called
Handler called
Handler called
Regards,
Ken Takata
--
--
You received this message from the "vim_dev" maillist.
Do not top-post! Type your reply below the text you are replying to.
For more information, visit http://www.vim.org/maillist.php
---
You received this message because you are subscribed to the Google Groups
"vim_dev" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
