[Rd] tab-complete for non-syntactic names could attempt backtick-wrapping

[Ivan Krylov]

В Wed, 1 Mar 2023 01:36:02 -0800
Michael Chirico via R-devel <r-devel using r-project.org> пишет:

> +comps[non_syntactic] <- paste0("`", comps[non_syntactic], "`")

There are a few more corner cases. For example, comps could contain
backticks (which should be escaped with backslashes) and backslashes
(which should also be escaped). Thankfully, \uXXXX-style Unicode escape
sequences are not currently supported inside backticks, and "escape the
backslash" rule already takes care of them.

The deparse() function already knows these rules:

name <- 'hello world ` \\uFF'
cat(deparse1(as.name(name), backtick=TRUE), '\n')
# `hello world \` \\uFF`
`hello world \` \\uFF` <- 'hello'
`hello world \` \\uFF`
# [1] "hello"

-- 
Best regards,
Ivan