rtreesitter

rtreesitter provides R bindings to the tree-sitter parsing library.

Installation

You can install the development version from GitHub with:

# install.packages("remotes")
remotes::install_github("jimhester/rtreesitter")

Usage

mkdir vendor
cd vendor
git clone https://github.com/jimhester/tree-sitter-r
git clone https://github.com/tree-sitter/tree-sitter-python
git clone https://github.com/tree-sitter/tree-sitter-javascript
git clone https://github.com/tree-sitter/tree-sitter-go

library(rtreesitter)


lib_dir <- file.path(tempdir(), "rtreesitter")
lib <- file.path(lib_dir, "languages.so")

repos <- c(
  "tree-sitter/tree-sitter-python",
  "tree-sitter/tree-sitter-javascript",
  "jimhester/tree-sitter-r"
)
for (repo in repos) {
  processx::run("git", c("clone", "--depth=1", sprintf("https://github.com/%s", repo), file.path(lib_dir, basename(repo))))
}

build_library(lib, file.path(lib_dir, basename(repos)))

p_r <- rts_parser$new("tree_sitter_R")
p_r$parse("x <- function(x) 1")
#> {rts_tree}
#> (program (left_assignment name: (identifier) value: (function_definition (formal_parameters (identifier)) (float))))

p_py <- rts_parser$new("tree_sitter_python")
p_py$parse("
def foo():
    if bar:
       baz()
")
#> {rts_tree}
#> (module (function_definition name: (identifier) parameters: (parameters) body: (block (if_statement condition: (identifier) consequence: (block (expression_statement (call function: (identifier) arguments: (argument_list))))))))

p_js <- rts_parser$new("tree_sitter_javascript")
p_js$parse('
    let name = "world";
    alert("hello " + name);')
#> {rts_tree}
#> (program (lexical_declaration (variable_declarator name: (identifier) value: (string))) (expression_statement (call_expression function: (identifier) arguments: (arguments (binary_expression left: (string) right: (identifier))))))