[Rd] incomplete results from as.character.srcref() in some cases involving quote()

Georgi Boshnakov georgi@bo@hn@kov @ending from m@nche@ter@@c@uk
Mon Jun 18 16:20:00 CEST 2018


The result of  as,character() on  'srcref' objects doesn't have the closing ')' in some cases involving 'quote':

> e4 <- quote({2+2})
> class(attr(e4, "wholeSrcref"))
[1] "srcref"
> as.character(attr(e4, "wholeSrcref"))
[1] "e4 <- quote({2+2}"

As a result printing the object also lacks it and gives an incomplete expression:

> attr(e4, "wholeSrcref")
e4 <- quote({2+2}

It seems that it is the top level quote that suffers from this. Here the inner 'quote' has the matching ')' but the outer one doesn't:

> e5 <- quote({quote({2+2})})
> class(attr(e5, "wholeSrcref"))
[1] "srcref"
> attr(e5, "wholeSrcref")
e5 <- quote({quote({2+2})}
> as.character(attr(e5, "wholeSrcref"))
[1] "e5 <- quote({quote({2+2})}"
> attributes(e5)

e5 <- quote({quote({2+2})}

Attribute 'wholeSrcref' seems undocumented but it is of class 'srcref' which is documented (eg ?srcref) and has supporting methods.

Georgi Boshnakov

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