Philippe Grosjean wrote:
Hello,
I need a similar behaviour as with the prompt: asking to complete incomplete
R command with eval(parse(text = ....))
Is it a way to make the difference between an illegal and an incomplete R
command in a string?
For instance:
parse(text="ls()")
expression(ls())
This is fine!
parse(text="ls(")
Error in parse(file, n, text, prompt) : parse error
This is an incomplete command, and I want to ask to the user for further
input (multiline command)
Hello Phillipe,
why not using something like this:
> ok<-try(parse(text="ls("), silent=TRUE)
> ok
[1] "Error in parse(file, n, text, prompt) : parse error\n"
attr(,"class")
[1] "try-error"
and then check if "ok" is an expression:
> is.expression(ok)
FALSE
Thomas P.
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