Re: I want to add a package to GNU ELPA: infix-notation-calculator

[Christian Johansson]

Eric: calc-embedded is really good, even better than my plugin, thanks 
for the tip! Storing calculations in variables is a good feature

Stefan: Looks cool, didn't it's possible to do stuff like that, however 
this project was primarily about testing my parser generator so I 
wouldn't want to change those parts of the program

Hälsningar / Best Regards
Christian

On 18/08/2021 01:28, Stefan Monnier wrote:
> > Sure, I think calc and calculator are more full-focused calculators that
> > require a learning-curve, this plugin is more of an quick ad-hoc calculator
> > that calculates values like (infix notation)
> [...]
>
> Thanks, but I meant to add that to the README or the `Commentary:`.
>
> Also I was thinking more about the documentation on which operations are
> supported.  [ IIUC you only support the four basic arithmetic
> operations, with standard precedence rules, plus parentheses for
> grouping, right?  ]
>
> Also, I was wondering if you had considered implementing the parser with
> the following approach:
>
> - read the line with (read-from-string (concat "(" STRING ")"))
> - massage the resulting sexp to implement the desired infix syntax.
>
> You could even do the massaging via a macro, where
>
>      (infix 2 + 3 * 5)
>      (infix 2 + (3 * 5))
>      (infix (2 + ((3) * 5)))
>
> all macroexpand to
>
>      (+ 2 (* 3 5))
>
> so your syntax could be used inside code as well.
>
>
>          Stefan