names_used: Symbols Used by an Expression
In nick-ulle/ast: Low-level Static Analysis Tools for R Code

Description Usage Arguments Details Value See Also Examples

This function returns a character vector of the symbols used by an expression.

1	names_used(x, ...)

`x`	A language object, `ASTNode` object, or `SymbolSets` object.
`...`	Further arguments to methods.

If you need both the symbols defined and the symbols used by an expression, it is more efficient to first call get_symbols() on the expression and then call names_defined() and/or names_used() on the result.

A character vector.

names_defined(), get_symbols(), CodeDepends::getInputs()

expr = quote(x = x + y)
names_used(expr)

# If defined symbols and used symbols are both needed:
symbols = get_symbols(expr)
names_defined(symbols)
names_used(symbols)