jsTranslate: Translate R code to JavaScript

In omegahat/RJavaScript: Tools for programming JavaScript using the R syntax

Description

This function takes an R language object or a file containing R code and attempts to convert it to equivalent JavaScript code. It provides ways to merge R objects into the code (via the substitute parameter).

Usage

jsTranslate(code, substitute = list(), jsGlobals = character(), addSemiColon = NA, ...)

Arguments

code	either a language object (e.g. an expression, call, if statement, etc.) or the name of file containing R code.
substitute	a list of R objects that can be inlined within the generated JavaScript code. These are serialized to JSON format and any reference to these values in the code causes this JSON representation to be substituted.
jsGlobals	the names of variables that are to be considered global in the JavaScript code.
addSemiColon	currently ignored.
...	for methods to add parameters that they understand.

Value

A string giving the JavaScript code. This is of class "JavaScriptCode". We may introduce additional sub-classes, e.g. JavaScriptFunction

Note

We might do more work to identify the global variables and also to identify where JavaScript variables should be declared, i.e. where to place the "var" declaration.

Author(s)

Duncan Temple Lang

References

JavaScript: The Definitive Guide, David Flanagan, O'Reilly \& Associates, Inc.

See Also

See the jsRewrite function and its methods for how the translation is done.

Examples

 jsTranslate(quote(if(is(x, "numeric")) x))

 jsTranslate(quote( x <- x + 1))

   # Rewrite a function.
 f = system.file("sampleCode", "function.R", package = "RJavaScript")
 jsTranslate(f)

   # Replace references to R variables.
 f = system.file("sampleCode", "assign.R", package = "RJavaScript")
 jsTranslate(f, list(init = c(1, 2, 3)))
 jsTranslate(f, list(init = c(1, 2, 3), w = list(abc = 1, xyz = "foo")))

omegahat/RJavaScript documentation built on May 24, 2019, 1:54 p.m.