These functions take an arbitrary R object, typically an expression, and represent it as a string.

  • quo_name() returns an abbreviated representation of the object as a single line string. It is suitable for default names.

  • quo_text() returns a multiline string. For instance block expressions like { foo; bar } are represented on 4 lines (one for each symbol, and the curly braces on their own lines).

These deparsers are only suitable for creating default names or printing output at the console. The behaviour of your functions should not depend on deparsed objects. If you are looking for a way of transforming symbols to strings, use as_string() instead of quo_name(). Unlike deparsing, the transformation between symbols and strings is non-lossy and well defined.

quo_label(quo)

quo_text(quo, width = 60L, nlines = Inf)

quo_name(quo)

Arguments

quo

A quosure or expression.

width

Width of each line.

nlines

Maximum number of lines to extract.

See also

Examples

# Quosures can contain nested quosures: quo <- quo(foo(!! quo(bar))) quo
#> <quosure> #> expr: ^foo(^bar) #> env: 0x361c130
# quo_squash() unwraps all quosures and returns a raw expression: quo_squash(quo)
#> foo(bar)
# This is used by quo_text() and quo_label(): quo_text(quo)
#> [1] "foo(bar)"
# Compare to the unwrapped expression: expr_text(quo)
#> [1] "~foo(~bar)"
# quo_name() is helpful when you need really short labels: quo_name(quo(sym))
#> [1] "sym"
quo_name(quo(!! sym))
#> [1] "function (x) ..."