I am trying to improve the error reporting in Sweave documents, so that
if you have a syntax error in a code chunk, it will tell you which line
of your input file contained the error.
For example, currently you get this:
Error: chunk 1 (label=named)
Error in parse(text = chunk) : unexpected symbol in "x <- foo bar"
Execution halted
and I'd like errors to be more like this:
Error: chunk 1 (label=named)
Error in parse(text = chunk, srcfile = srcfile) :
test.Rnw:9:10: unexpected symbol
9: x <- foo bar
^
Execution halted
It turns out that this requires changes that make the "expand=FALSE"
option quite hard to implement. Is anyone using it? For those who
don't know it, "expand=FALSE" means that a code chunk like
<<echo=TRUE, keep.source=TRUE,expand=FALSE>>=
z <- 3
<<named>>
@
will be displayed as
> z <- 3
> <<named>>
rather than expanding the named chunk. I'd like to drop the option, so
that the default behaviour (which has always been equivalent to "expand
= TRUE") would be the only behaviour.
Duncan Murdoch
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