Hi,
Short version of the question: How does one document a method for the "("
class in a .Rd file?
Details:
I recently contributed to the digest package functions to assist with
generating sha1 hashes for formula objects. Sometimes within formula, the
parenthesis ("(") class is used, for example [1]:
> class((a~(b+c))[[3]])
[1] "("
So, I wrote a method to handle that class, too. When trying to document it
in the .Rd file, I tried the following code, but when checking the
documentation, it gets an error:
\method{sha1}{"("}(x, digits = 14, zapsmall = 7, ..., algo = "sha1")
The error when checking the documentation is:
> checking Rd \usage sections ... WARNING
Bad \usage lines found in documentation object 'sha1':
<unescaped bksl>method{sha1}{"("}(x, digits = 14, zapsmall = 7, ...,
algo = "sha1")
Functions with \usage entries need to have the appropriate \alias
entries, and all their arguments documented.
The \usage entries must correspond to syntactically valid R code.
See chapter 'Writing R documentation files' in the 'Writing R
Extensions' manual.
I have tried variants of escaping the parenthesis like "\(" and "\\(" and
the unescaped variant "(", too.
Thanks,
Bill
[1] In case the first thought is, "don't write formula which have a full
side within redundant parentheses", something equivalent to this was created
by update.formula().
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