[R] [R-devel] Source Code for function

[Wang Jiefei]

If you are looking for an R code parser, I think the `parse` and `eval`
function might be a good start point. See the example below.

> parse(text="function(x)message(x)")
expression(function(x)message(x))
> eval(parse(text="function(x)message(x)"))
function(x)message(x)

Best,
Jiefei

On Fri, Sep 6, 2019 at 12:55 PM Golden, Shelby <GoldenS using njhealth.org> wrote:

> Hello Bert,
>
> Thank you for the reply and your clarifications. Yes, it might be helpful
> to look into R’s formal grammar to see how “function” parses input to
> delegate correct syntax. Is that accessible online?
>
> Thank you,
> Shelby
>
>
> From: Bert Gunter <bgunter.4567 using gmail.com>
> Date: Friday, September 6, 2019 at 10:44 AM
> To: "Golden, Shelby" <GoldenS using NJHealth.org>
> Cc: "r-help using R-project.org" <r-help using r-project.org>, "Gillenwater, Lucas" <
> GILLENWATERL using NJHEALTH.ORG>
> Subject: Re: [R] [R-devel] Source Code for function
>
> 1. This is a plain text list; all html is stripped. So there is no red
> highlighting.
>
> 2. There is no "source code" for "function" -- it is a reserved keyword.
> Or are you looking for R's formal grammar -- e.g. how it parses input to
> determine correct syntax?
>
>
>
> Bert Gunter
>
> "The trouble with having an open mind is that people keep coming along and
> sticking things into it."
> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
>
>
> On Fri, Sep 6, 2019 at 8:51 AM Golden, Shelby <GoldenS using njhealth.org
> <mailto:GoldenS using njhealth.org>> wrote:
> Hi all,
>
> I have been attempting to access the source code for the keyword
> “function” to better understand how it assigns and stores logical inputs,
> like in the subset() [base] function. Does anyone know how I can access the
> source code for this?
>
> For example, if I have
> norm <- function(x){
>       sqrt(x%*%x))
> }
> I am looking for the source code for the “function” portion, highlighted
> in red.
>
> Thank you for your time and assistance,
> Shelby Golden
> Lab Researcher Technician
> Dr. Russell Bowler’s Lab
> Department of Medicine
> National Jewish Health in Denver, CO
> Phone: (303) 270-2598
>
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