Add parens if not found — ensure

Opening and closing parens will be added if an opening paren is not the first non-whitespace character.

ensure_parens(x)

Arguments

x	a list or vector

Value

x is returned, possibly modified with parens added.

Examples

ensure_parens(letters[1:4])
#> [1] "(a)" "(b)" "(c)" "(d)"

ensure_parens(as.list(letters[1:4]))
#> [[1]]
#> [1] "(a)"
#> 
#> [[2]]
#> [1] "(b)"
#> 
#> [[3]]
#> [1] "(c)"
#> 
#> [[4]]
#> [1] "(d)"
#> 

ensure_parens(c("(a)", "b", "(c)"))
#> [1] "(a)" "(b)" "(c)"