[Rd] parse(text=...) and the srcfile attribute

Deepayan Sarkar deepayan.sarkar at gmail.com
Fri Jul 13 03:52:50 CEST 2007


I'm trying to understand whether the new source file references can
help me with something I want to do. Let's say I have

foo <- parse(text = "
a <- 1; b <- 2**2
a + b

I now wish to recover the sources for the parsed expressions. I can
get them one at a time:

> foo[[2]]
b <- 2^2
> as.character(attr(foo, "srcref")[[2]])
[1] "b <- 2**2"

Is there a better way? Perhaps like the print method

> as.character(foo, useSource = TRUE)

could give all the sources at once?


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