https://github.com/jimhester/altparsers

https://github.com/jimhester/altparsers

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• Host: GitHub
• URL: https://github.com/jimhester/altparsers
• Owner: jimhester
• Created: 2018-06-19T20:11:37.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-11-05T14:55:51.000Z (about 6 years ago)
• Last Synced: 2024-06-12T18:18:08.092Z (7 months ago)
• Language: C
• Size: 268 KB
• Stars: 19
• Watchers: 4
• Forks: 1
• Open Issues: 1
• Metadata Files:
  • Readme: README.md

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README

        
# altparsers

The `altparsers` package allows the user or package developer to use

alternative parsers for R code. It provides helpers for parsing and evaluating

code and for starting a REPL with a non-standard R parser.

[Ex](https://github.com/jimhester/ex) is an example package which contains code

to be used by the example parsers defined in the altparser package.

The expressions returned by the parsers are valid R expressions and are

evaluated in the same way as normal R code.

```{r}

library(altparsers)

repl(parser = tidy_parse_text)

#> [1, 2, 3] |> head(n = 1)

```

```{r}

repl(parser = sexp_parse_text)

(= x 5)

(== x 5)

#> [1] TRUE

(+ x (* 3 5))

#> [1] 20

```

## Within packages

`tidyparsers::src()` can be used within a package to source and evaluate code

written for alternative parsers. Generally this code needs to be in a

installed directory, such as `inst/r2`.

```{r}

.onLoad <- function(libname, pkgname) {

  altparsers::src("r2", parser = altparsers::tidy_parse_file)

}