esprima: JavaScrip Syntax Tree

In js: Tools for Working with JavaScript in R

JavaScrip Syntax Tree

Description

Esprima is a high performance, standard-compliant ECMAScript parser. It has full support for ECMAScript 2017 and returns a sensible syntax tree format as standardized by ESTree project.

Usage

esprima_tokenize(text, range = FALSE, loc = FALSE, comment = FALSE)

esprima_parse(text, jsx = FALSE, range = FALSE, loc = FALSE,
  tolerant = FALSE, tokens = FALSE, comment = FALSE)

Arguments

text	a character vector with JavaScript code
range	Annotate each token with its zero-based start and end location
loc	Annotate each token with its column and row-based location
comment	Include every line and block comment in the output
jsx	Support JSX syntax
tolerant	Tolerate a few cases of syntax errors
tokens	Collect every token

Details

The esprima_tokenize function returns a data frame with JavaScript tokens. The esprima_parse function returns the Syntax Tree in JSON format. This can be parsed to R using e.g. jsonlite::fromJSON.

References

Esprima documentation: http://esprima.readthedocs.io/en/4.0/.

Examples

code <- "function test(x, y){ x = x || 1; y = y || 1; return x*y;}"
esprima_tokenize(code)
esprima_parse(code)

js documentation built on Oct. 4, 2024, 5:09 p.m.