get_symbols: Get Sets of Defined and Used Symbols

In nick-ulle/ast: Low-level Static Analysis Tools for R Code

Description

This function returns the set of symbols defined by an expression and the set of symbols used by an expression.

Usage

get_symbols(node, initial = SymbolSets(), ...)

Arguments

node	(ASTNode) The expression to analyze.
initial	(SymbolSets) The initial sets of defined/used expressions.
...	Further arguments to methods.
recursive	(logical) Search for symbols in function definitions?
include_default_arguments	(logical) Search for symbols in default arguments?
only_undefined_uses	(logical) Exclude used symbols that are defined in node before they are used?

Value

A SymbolSets object, with elements defined and used. Element defined is a list of expressions that define a symbol. Element used is a list of used symbols.

See Also

names_defined(), names_used(), CodeDepends::getInputs()

Examples

ast = quote_ast(x <- sum(x, 1, y))
get_symbols(ast)

nick-ulle/ast documentation built on Oct. 18, 2019, 4:37 a.m.